74HC74 Dual D Flip-Flop: Datasheet pdf, Pinout and Flip-Flop Diagram
2V~6V 28MHz D-Type Flip Flop DUAL 74HC74 14 Pins 2μA 74HC Series 14-SOIC (0.154, 3.90mm Width)









2V~6V 28MHz D-Type Flip Flop DUAL 74HC74 14 Pins 2μA 74HC Series 14-SOIC (0.154, 3.90mm Width)
The 74HC74 is a dual positive edge-triggered D-type flip-flop. It has individual data (nD), clock (NCP), set (nSD)) and reset (nRD) inputs, and complementary nQ and nQ outputs. This article is going to introduce detailed information about 74HC74 Dual D Flip−Flop.

Simple set reset flip flop circuit made using a 7474 74HC74 integrated circuit IC
What is 74HC74?
The 74HC74 is a D-type flip-flop with dual positive edge triggering. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. The device inputs are compatible with standard CMOS outputs; with pullup resistors and it is compatible with LSTTL outputs.

74HC74 Logic Diagram
74HC74 Pinout

74HC74 Pinout
74HC74 Functional Pinout

74HC74 Functional Pinout
74HC74 CAD Model

74HC74 Symbol

74HC74 Footprint
Specifications
- TypeParameter
- Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
14-SOIC (0.154, 3.90mm Width) - 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.
Surface Mount - 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.
Surface Mount - Number of Pins14
- Clock-Edge Trigger TypePositive Edge
- Series
In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.
74HC - 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.
Tape & Reel (TR) - 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.
-55°C~125°C TA - 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.
e3 - 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 Terminations14
- TypeD-Type
- 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 (Sn) - Packing Method
The packing method in electronic components refers to the technique used to package and protect the component during shipping and handling. It encompasses various forms including tape and reel, tray, tube, or bulk packaging, each suited for different types of components and manufacturing processes. The choice of packing method can affect the ease of handling, storage, and the efficiency of assembly in automated processes. Additionally, it plays a crucial role in ensuring the reliability and integrity of the components until they are used in electronic devices.
TAPE AND REEL - Voltage - Supply
Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.
2V~6V - 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 - Terminal Form
Occurring at or forming the end of a series, succession, or the like; closing; concluding.
GULL WING - 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.
260 - Supply Voltage
Supply voltage refers to the electrical potential difference provided to an electronic component or circuit. It is crucial for the proper operation of devices, as it powers their functions and determines performance characteristics. The supply voltage must be within specified limits to ensure reliability and prevent damage to components. Different electronic devices have specific supply voltage requirements, which can vary widely depending on their design and intended application.
3V - 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.
unknown - 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.
40 - 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.
74HC74 - 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.
Set(Preset) and Reset - Qualification Status
An indicator of formal certification of qualifications.
Not Qualified - 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.
Differential - Polarity
In electronic components, polarity refers to the orientation or direction in which the component must be connected in a circuit to function properly. Components such as diodes, capacitors, and LEDs have polarity markings to indicate which terminal should be connected to the positive or negative side of the circuit. Connecting a component with incorrect polarity can lead to malfunction or damage. It is important to pay attention to polarity markings and follow the manufacturer's instructions to ensure proper operation of electronic components.
Non-Inverting - Number of Circuits2
- Load Capacitance
the amount of capacitance measured or computed across the crystal terminals on the PCB. Frequency Tolerance. Frequency tolerance refers to the allowable deviation from nominal, in parts per million (PPM), at a specific temperature, usually +25°C.
50pF - Current - Output
Current - Output is a parameter in electronic components that refers to the maximum amount of current that can be delivered by the output of the component. It is a crucial specification as it determines the capability of the component to supply power to connected devices or circuits. The current output rating is typically specified in amperes (A) and is important for ensuring that the component can safely and effectively power the load it is connected to without overheating or failing. Designers and engineers must consider the current output rating when selecting components to ensure compatibility and reliable operation of the overall system.
5.2mA - Clock Frequency
Clock frequency, also known as clock speed, refers to the rate at which a processor or electronic component can execute instructions. It is measured in hertz (Hz) and represents the number of cycles per second that the component can perform. A higher clock frequency typically indicates a faster processing speed and better performance. However, it is important to note that other factors such as architecture, efficiency, and workload also play a significant role in determining the overall performance of a component. In summary, clock frequency is a crucial parameter that influences the speed and efficiency of electronic components in processing data and executing tasks.
28MHz - Propagation Delay
the flight time of packets over the transmission link and is limited by the speed of light.
100 ns - Turn On Delay Time
Turn-on delay, td(on), is the time taken to charge the input capacitance of the device before drain current conduction can start.
21 ns - Family
In electronic components, the parameter "Family" typically refers to a categorization or classification system used to group similar components together based on their characteristics, functions, or applications. This classification helps users easily identify and select components that meet their specific requirements. The "Family" parameter can include various subcategories such as resistors, capacitors, diodes, transistors, integrated circuits, and more. Understanding the "Family" of an electronic component can provide valuable information about its compatibility, performance specifications, and potential uses within a circuit or system. It is important to consider the "Family" parameter when designing or troubleshooting electronic circuits to ensure proper functionality and compatibility with other components.
HC/UH - Logic Function
In electronic components, the term "Logic Function" refers to the specific operation or behavior of a component based on its input signals. It describes how the component processes the input signals to produce the desired output. Logic functions are fundamental to digital circuits and are used to perform logical operations such as AND, OR, NOT, and XOR.Each electronic component, such as logic gates or flip-flops, is designed to perform a specific logic function based on its internal circuitry. By understanding the logic function of a component, engineers can design and analyze complex digital systems to ensure proper functionality and performance. Different logic functions can be combined to create more complex operations, allowing for the creation of sophisticated digital devices and systems.
AND, D-Type - Current - Quiescent (Iq)
The parameter "Current - Quiescent (Iq)" in electronic components refers to the amount of current consumed by a device when it is in a quiescent or idle state, meaning when it is not actively performing any tasks or operations. This parameter is important because it represents the baseline power consumption of the device even when it is not actively being used. A lower quiescent current (Iq) value is desirable as it indicates that the device is more energy-efficient and will consume less power when not in use, which can help extend battery life in portable devices and reduce overall power consumption in electronic systems. Designers often pay close attention to the quiescent current specification when selecting components for low-power applications or battery-operated devices.
2μA - Max I(ol)
Max I(ol) refers to the maximum output current that a specific electronic component, such as a transistor or integrated circuit, can sink or source. This parameter is crucial in determining the capability of the component to drive external loads without being damaged. It is typically specified in the component's datasheet and is important for ensuring proper operation and reliability of the circuit in which the component is used. Designers must ensure that the output current requirements of the circuit do not exceed the specified "Max I(ol)" value to prevent overloading and potential failure of the component.
0.004 A - Number of Bits per Element1
- Max Propagation Delay @ V, Max CL
The parameter "Max Propagation Delay @ V, Max CL" in electronic components refers to the maximum amount of time it takes for a signal to propagate through the component from input to output when operating at a specific voltage (V) and driving a maximum specified load capacitance (CL). This parameter is crucial in determining the speed and performance of the component in a circuit. A shorter propagation delay indicates faster signal processing and better overall performance. Designers use this parameter to ensure that signals can be transmitted and received within the required timing constraints in their electronic systems.
17ns @ 6V, 50pF - Trigger Type
Trigger Type in electronic components refers to the mechanism or method by which a device, such as a flip-flop or timer, responds to an input signal. It defines how the device transitions between states based on specific conditions, such as rising or falling edges of a signal, levels, or pulses. Different trigger types such as edge-triggered, level-triggered, or pulse-triggered influence the timing and behavior of the circuit, thereby determining how input signals affect the output in various applications.
Positive Edge - Input Capacitance
The capacitance between the input terminals of an op amp with either input grounded. It is expressed in units of farads.
10pF - Number of Output Lines1
- Voltage - Supply (Max)
Voltage - Supply (Max) is a parameter in electronic components that specifies the maximum voltage that can be safely applied to the component for proper operation. This parameter is crucial for ensuring the component's longevity and preventing damage due to overvoltage conditions. Exceeding the maximum supply voltage can lead to component failure, reduced performance, or even permanent damage. Designers must carefully consider this parameter when selecting components and designing circuits to ensure reliable and safe operation within the specified voltage limits.
6V - Voltage - Supply (Min)
Voltage - Supply (Min) is a parameter in electronic components that specifies the minimum voltage required for the component to operate within its specified performance range. This parameter indicates the lowest voltage level that can be safely applied to the component without causing malfunctions or damage. It is crucial to ensure that the supply voltage provided to the component is equal to or higher than the specified minimum voltage to guarantee proper functionality and reliability. Failure to meet this requirement may result in erratic behavior, reduced performance, or even permanent damage to the component.
2V - Width3.9mm
- Length8.65mm
- RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
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
74HC74 Features
Output Drive Capability: 10 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 A
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the JEDEC Standard No. 7A Requirements
ESD Performance: HBM 2000 V; Machine Model 200 V
Chip Complexity: 128 FETs or 32 Equivalent Gates
Pb−Free Packages are Available
74HC74 Applications
These are different flip-flops used in digital electronic circuits. Below are the applications of Flip-flops:
Counters
Frequency dividers
Shift registers
Storage registers
74HC74 Circuit Diagram
The IC power source VDD ranges from 0 + 7V and data provided in the datasheet. The following snapshot shows it. Also, we have used LED on the output; it has limited the source to 5V to control the supply voltage and DC output voltage. We have used the LM7805 regulator to limit the LED voltage.

74HC74 Circuit

Parts with Similar Specs
- ImagePart NumberManufacturerPackage / CaseNumber of PinsLogic FunctionNumber of Bits per ElementPropagation DelayClock Edge Trigger TypeSupply VoltageTechnologyView Compare
74HC74DR2G
14-SOIC (0.154, 3.90mm Width)
14
AND, D-Type
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14-SOIC (0.154, 3.90mm Width)
14
AND, D-Type, Flip-Flop
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14-SOIC (0.209, 5.30mm Width)
14
AND, D-Type, Flip-Flop
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74HC74 Package Dimensions

74HC74 Package Dimensions
74HC74 Manufacturer
ON Semiconductor (Nasdaq: ON) is driving energy-efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy-efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace, and power supply applications. ON Semiconductor operates a responsive, reliable, world-class supply chain and quality program, and a network of manufacturing facilities, sales offices, and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.
Trend Analysis
Datasheet PDF
- Datasheets :
- ReachStatement :
- PCN Obsolescence/ EOL :
How does a 74HC74 work?
The 74HC74 is identical in pinout to the LS74. The device inputs are compatible with standard CMOS outputs; with pull-up resistors, they are compatible with LSTTL outputs. This device consists of two D flip−flops with individual Set, Reset, and Clock inputs.
What is a flip-flop used for?
In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information – a bistable multivibrator. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs.
What is the voltage of 74HC74?
2.7 V to 3.6 V
What are the inputs of D flip-flop?
D flip–flop has two inputs, a clock (CLK) input, and a data (D) input, and two outputs; one is the main output represented by Q and the other is the complement of Q represented by Q'.6
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