SG3525 Pulse width modulation controller IC: Datasheet, and Pinout
16 Terminals 8V~35V 16-Pin SG3525A DC to DC converter IC SWITCHING CONTROLLER 2 Outputs 100Hz~400kHz Transistor Driver









16 Terminals 8V~35V 16-Pin SG3525A DC to DC converter IC SWITCHING CONTROLLER 2 Outputs 100Hz~400kHz Transistor Driver
This article provides you with a basic overview of the SG3525 pulse width modulator IC, including its pin descriptions, functions, specifications, block diagram, etc., to help you quickly understand what SG3525 is.

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SG3525 Description
SG3525 is a Pulse Width Modulator IC. This IC is used to design all kinds of SMPS (Switched Mode Power Supply) and PWM signals for power electronics projects. It has improved performance and fewer external parts and is a 16-pin IC. To control the output voltage, it provides a feedback circuit that controls the voltage by comparing the feedback signal with a reference signal. Based on the feedback current limit, it has a protection circuit that cuts off the PWM signal. In addition, this device has a built-in soft start circuit.
SG3525 Features
Supply Voltage: 8V to 35V
Oscillation Range: 100 Hz to 400 kHz
Maximum Power Dissipation: 1000 mW
5.1 V Reference Trimmed TO ± 1 %
Supply Voltage VCC: +40 Vdc
Logic input: -0.3 to 5.5 V
Output current IO: ±500 mA
Reference output current Iref: 50 mA
Oscillator charging current: 5 mA
Power Dissipation PD: 1000 mW
Thermal resistance, junction-to-Air RθJA: 100 ˚C/W
Thermal resistance, junction-to-Case RθJC: 60 ˚C/W
Operating junction temperature TJ: 150 ˚C
Dual-source/sink output drivers
Internal Soft-Start
Pulse by pulse Shutdown
Adjustable dead time control
Separate oscillator sync terminal
Latching PWM to prevent multiple pulses
SG3525 Pinout and configuration

| Pin Number | Pin Name | Pin Function |
| 1 | INV | Inverting Input |
| 2 | NINV | Non-Inverting Input |
| 3 | SYNC | Synchronizing IC with an external oscillator frequency. |
| 4 | OSC. Output | Oscillator Output. The frequency of IC is confirmed at this pin. |
| 5, 6 | C T & R T | These pins are used to connect an external capacitor and resistor respectively to set up the frequency of the oscillator circuit. |
| 7 | Discharge (DIS) | This pin is used to determine the dead time for IC. A resistor connected between pin-7 and 5 will decide the frequency of PWM (or dead time). |
| 8 | Soft Start (SS) | A capacitor is connected with this pin and ground. As the name suggests, this pin is used to initiate operation softly. |
| 9 | Compensation (COMP) | This is a compensation pin. It is used to compensate for the error and avoid rapid fluctuations. |
| 10 | Shutdown | This is a shutdown pin. It instantly narrows down to PWM signals to the maximum level if it is set high. This pin is used to shutting down the output of the IC in the event of malfunction or unwanted conditions. |
| 11 | Output A | This is an output pin that is used as an input for external devices. |
| 12 | VSS | This pin is a ground pin. |
| 13 | V C | This is a power pin used to supply input voltage 5-35 V. A resistor is connected to the DC supply. Therefore, this register decides the magnitude of the trigger current to the output current. |
| 14 | Output B | This is an output pin that is used as an input for external devices. |
| 15 | V in | It is a supply input voltage of 8-35 V. |
| 16 | V ref | It is a reference pin used to set reference voltage through pins 1 and 2. |
SG3525 Example Circuit diagram

Specifications
- TypeParameter
- Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Through Hole - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Through Hole - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
16-DIP (0.300, 7.62mm) - Number of Pins16
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
0°C~70°C TA - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tube - Published2000
- JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e0 - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Obsolete - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations16
- ECCN Code
An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.
EAR99 - Terminal Finish
Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.
Tin/Lead (Sn/Pb) - Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
DUAL - Peak Reflow Temperature (Cel)
Peak Reflow Temperature (Cel) is a parameter that specifies the maximum temperature at which an electronic component can be exposed during the reflow soldering process. Reflow soldering is a common method used to attach electronic components to a circuit board. The Peak Reflow Temperature is crucial because it ensures that the component is not damaged or degraded during the soldering process. Exceeding the specified Peak Reflow Temperature can lead to issues such as component failure, reduced performance, or even permanent damage to the component. It is important for manufacturers and assemblers to adhere to the recommended Peak Reflow Temperature to ensure the reliability and functionality of the electronic components.
NOT SPECIFIED - Reach Compliance Code
Reach Compliance Code refers to a designation indicating that electronic components meet the requirements set by the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation in the European Union. It signifies that the manufacturer has assessed and managed the chemical substances within the components to ensure safety and environmental protection. This code is vital for compliance with regulations aimed at minimizing risks associated with hazardous substances in electronic products.
not_compliant - Frequency
In electronic components, the parameter "Frequency" refers to the rate at which a signal oscillates or cycles within a given period of time. It is typically measured in Hertz (Hz) and represents how many times a signal completes a full cycle in one second. Frequency is a crucial aspect in electronic components as it determines the behavior and performance of various devices such as oscillators, filters, and communication systems. Understanding the frequency characteristics of components is essential for designing and analyzing electronic circuits to ensure proper functionality and compatibility with other components in a system.
400kHz - Time@Peak Reflow Temperature-Max (s)
Time@Peak Reflow Temperature-Max (s) refers to the maximum duration that an electronic component can be exposed to the peak reflow temperature during the soldering process, which is crucial for ensuring reliable solder joint formation without damaging the component.
NOT SPECIFIED - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
SG3525A - Function
The parameter "Function" in electronic components refers to the specific role or purpose that the component serves within an electronic circuit. It defines how the component interacts with other elements, influences the flow of electrical signals, and contributes to the overall behavior of the system. Functions can include amplification, signal processing, switching, filtering, and energy storage, among others. Understanding the function of each component is essential for designing effective and efficient electronic systems.
Step-Up/Step-Down - Number of Outputs2
- Qualification Status
An indicator of formal certification of qualifications.
Not Qualified - Output Voltage
Output voltage is a crucial parameter in electronic components that refers to the voltage level produced by the component as a result of its operation. It represents the electrical potential difference between the output terminal of the component and a reference point, typically ground. The output voltage is a key factor in determining the performance and functionality of the component, as it dictates the level of voltage that will be delivered to the connected circuit or load. It is often specified in datasheets and technical specifications to ensure compatibility and proper functioning within a given system.
5.2V - Output Type
The "Output Type" parameter in electronic components refers to the type of signal or data that is produced by the component as an output. This parameter specifies the nature of the output signal, such as analog or digital, and can also include details about the voltage levels, current levels, frequency, and other characteristics of the output signal. Understanding the output type of a component is crucial for ensuring compatibility with other components in a circuit or system, as well as for determining how the output signal can be utilized or processed further. In summary, the output type parameter provides essential information about the nature of the signal that is generated by the electronic component as its output.
Transistor Driver - Input Voltage-Nom
Input Voltage-Nom refers to the nominal or rated input voltage that an electronic component or device is designed to operate within. This parameter specifies the voltage level at which the component is expected to function optimally and safely. It is important to ensure that the actual input voltage supplied to the component does not exceed this nominal value to prevent damage or malfunction. Manufacturers provide this specification to guide users in selecting the appropriate power supply or input voltage source for the component. It is a critical parameter to consider when designing or using electronic circuits to ensure reliable performance and longevity of the component.
20V - Analog IC - Other Type
Analog IC - Other Type is a parameter used to categorize electronic components that are integrated circuits (ICs) designed for analog signal processing but do not fall into more specific subcategories such as amplifiers, comparators, or voltage regulators. These ICs may include specialized analog functions such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), voltage references, or signal conditioning circuits. They are typically used in various applications where precise analog signal processing is required, such as in audio equipment, instrumentation, communication systems, and industrial control systems. Manufacturers provide detailed specifications for these components to help engineers select the most suitable IC for their specific design requirements.
SWITCHING CONTROLLER - Output Configuration
Output Configuration in electronic components refers to the arrangement or setup of the output pins or terminals of a device. It defines how the output signals are structured and how they interact with external circuits or devices. The output configuration can determine the functionality and compatibility of the component in a circuit design. Common types of output configurations include single-ended, differential, open-drain, and push-pull configurations, each serving different purposes and applications in electronic systems. Understanding the output configuration of a component is crucial for proper integration and operation within a circuit.
Positive - Power Dissipation
the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.
1W - Output Current
The rated output current is the maximum load current that a power supply can provide at a specified ambient temperature. A power supply can never provide more current that it's rated output current unless there is a fault, such as short circuit at the load.
400mA - Voltage - Supply (Vcc/Vdd)
Voltage - Supply (Vcc/Vdd) is a key parameter in electronic components that specifies the voltage level required for the proper operation of the device. It represents the power supply voltage that needs to be provided to the component for it to function correctly. This parameter is crucial as supplying the component with the correct voltage ensures that it operates within its specified limits and performance characteristics. It is typically expressed in volts (V) and is an essential consideration when designing and using electronic circuits to prevent damage and ensure reliable operation.
8V~35V - Quiescent Current
The quiescent current is defined as the current level in the amplifier when it is producing an output of zero.
1mA - Control Features
Control features in electronic components refer to specific functionalities or characteristics that allow users to manage and regulate the operation of the component. These features are designed to provide users with control over various aspects of the component's performance, such as adjusting settings, monitoring parameters, or enabling specific modes of operation. Control features can include options for input/output configurations, power management, communication protocols, and other settings that help users customize and optimize the component's behavior according to their requirements. Overall, control features play a crucial role in enhancing the flexibility, usability, and performance of electronic components in various applications.
Enable, Frequency Control, Soft Start - Input Voltage (Min)
Input Voltage (Min) is a parameter in electronic components that specifies the minimum voltage level required for the component to operate properly. It indicates the lowest voltage that can be safely applied to the component without causing damage or malfunction. This parameter is crucial for ensuring the reliable and safe operation of the component within its specified operating range. It is important for designers and engineers to consider the minimum input voltage requirement when selecting and using electronic components in their circuits to prevent potential issues such as underperformance or failure.
8V - Topology
In the context of electronic components, "topology" refers to the arrangement or configuration of the components within a circuit or system. It defines how the components are connected to each other and how signals flow between them. The choice of topology can significantly impact the performance, efficiency, and functionality of the electronic system. Common topologies include series, parallel, star, mesh, and hybrid configurations, each with its own advantages and limitations. Designers carefully select the appropriate topology based on the specific requirements of the circuit to achieve the desired performance and functionality.
Push-Pull - Control Mode
In electronic components, "Control Mode" refers to the method or mode of operation used to regulate or control the behavior of the component. This parameter determines how the component responds to input signals or commands to achieve the desired output. The control mode can vary depending on the specific component and its intended function, such as voltage regulation, current limiting, or frequency modulation. Understanding the control mode of an electronic component is crucial for proper integration and operation within a circuit or system.
VOLTAGE-MODE - Frequency - Switching
"Frequency - Switching" in electronic components refers to the rate at which a device, such as a transistor or switching regulator, turns on and off during operation. This parameter is crucial in determining the efficiency and performance of power converters, oscillators, and other circuits that rely on rapid switching. Higher switching frequencies typically allow for smaller component sizes but may require more advanced design considerations to manage heat and electromagnetic interference.
100Hz~400kHz - Input Voltage (Max)
Input Voltage (Max) refers to the maximum voltage that an electronic component can safely handle without getting damaged. This parameter is crucial for ensuring the proper functioning and longevity of the component. Exceeding the maximum input voltage can lead to overheating, electrical breakdown, or even permanent damage to the component. It is important to carefully consider and adhere to the specified maximum input voltage when designing or using electronic circuits to prevent any potential issues or failures.
35V - Control Technique
In electronic components, "Control Technique" refers to the method or approach used to regulate and manage the operation of the component. This parameter is crucial in determining how the component functions within a circuit or system. Different control techniques can include analog control, digital control, pulse-width modulation (PWM), and various feedback mechanisms. The choice of control technique can impact the performance, efficiency, and overall functionality of the electronic component. It is important to select the appropriate control technique based on the specific requirements and characteristics of the application in which the component will be used.
PULSE WIDTH MODULATION - Rise Time
In electronics, when describing a voltage or current step function, rise time is the time taken by a signal to change from a specified low value to a specified high value.
100ns - Synchronous Rectifier
Synchronous rectification is a technique for improving the efficiency of rectification by replacing diodes with actively controlled switches, usually power MOSFETs or power bipolar junction transistors (BJT).
Yes - Fall Time (Typ)
Fall Time (Typ) is a parameter used to describe the time it takes for a signal to transition from a high level to a low level in an electronic component, such as a transistor or an integrated circuit. It is typically measured in nanoseconds or microseconds and is an important characteristic that affects the performance of the component in digital circuits. A shorter fall time indicates faster switching speeds and can result in improved overall circuit performance, such as reduced power consumption and increased data transmission rates. Designers often consider the fall time specification when selecting components for their circuits to ensure proper functionality and efficiency.
50 ns - Max Duty Cycle
Max Duty Cycle refers to the maximum percentage of time that an electronic component, such as a switch or a power supply, can be in an "on" state during a defined time period. It is an important parameter in pulse-width modulated (PWM) systems and helps determine how often a device can operate without overheating or sustaining damage. By specifying the maximum duty cycle, manufacturers provide guidance on the safe operational limits of the component, ensuring reliability and efficiency in various applications.
49 % - Output Phases
Output Phases in electronic components refer to the number of distinct output signals or waveforms that the component can generate. This parameter is commonly associated with devices such as power inverters, motor drives, and signal generators. The output phases indicate how many separate signals can be produced simultaneously by the component, with each phase typically representing a different electrical waveform or signal. Understanding the output phases of an electronic component is important for designing and implementing systems that require multiple output signals or for ensuring compatibility with other components in a circuit.
1 - Height Seated (Max)
Height Seated (Max) is a parameter in electronic components that refers to the maximum allowable height of the component when it is properly seated or installed on a circuit board or within an enclosure. This specification is crucial for ensuring proper fit and alignment within the overall system design. Exceeding the maximum seated height can lead to mechanical interference, electrical shorts, or other issues that may impact the performance and reliability of the electronic device. Manufacturers provide this information to help designers and engineers select components that will fit within the designated space and function correctly in the intended application.
4.44mm - REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
No SVHC - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
Non-RoHS Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
Where to use SG3525
SG3525 is a voltage-mode PWM controller integrated circuit. It is used in the maximum number of inverters available in the market.
Even top inverters manufacturing companies also use SG3525 in the dc to dc converter part of the inverter. It is a 16-pin integrated circuit.
How to use SG3525
SG3525 is a PWM controller IC and is used in most inverters. It has two PWM outputs and a built-in totem pole PWM driver. This IC is used to drive semiconductor devices with a current range of 50mA. The output frequency of the IC is determined by pins 5, 6, and 7. The frequency can be calculated using the following equation.

SG3525 Manufacturer
onsemi (legally ON Semiconductor Corporation; formerly ON Semiconductor until August 5, 2021) is an American semiconductor supplier company, formerly in the Fortune 500, but dropping into the Fortune 1000 (ranked 512) in 2020. Products include power and signal management, logic, discrete, and custom devices for automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace, and power applications. onsemi runs a network of manufacturing facilities, sales offices, and design centers in North America, Europe, and the Asia Pacific regions. Headquartered in Phoenix, Arizona, onsemi has revenues of $3.907 billion (2016), which puts it among the worldwide top 20 semiconductor sales leaders.
SG3525 Package


PDIP−16


SOIC−16L
Trend Analysis
Datasheet PDF
- PCN Obsolescence/ EOL :
- Datasheets :
- ReachStatement :
Parts with Similar Specs
What is PWM?
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a method of reducing the average power delivered by an electrical signal, by effectively chopping it up into discrete parts. The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate.
How many pins does SG3525 have?
16 pins.
Where does SG3525 can be used?
SG3525 is mainly used in DC-DC inverters, switching regulators of any polarity, and used for regulating the power supply.
What is SG3525?
SG3525 is a pulse-width modulator IC. This IC is used to design all types of SMPS (Switched Mode Power Supply) and PWM signals for power electronics projects. It has improved performance and lower external parts and is a 16-pin IC.
What’s the SG3525 recommended operation temperature?
It’s between -55 and 125℃.
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