2SA1837 PNP Epitaxial Silicon Transistor: 2SA1837 Power, Datasheet pdf and Equivalents
Trans GP BJT PNP 230V 1A 3-Pin(3 Tab) TO-220NIS
The 2SA1837 is a PNP epitaxial silicon transistor and is available in the same TO-220F plastic package. This article is going to discuss datasheet, equivalent, pinout, and other details about the 2SA1837 transistor.

2SA1837 PNP Bipolar Transistor Hindi
What is 2SA1837?
The 2SA1837 is a PNP epitaxial silicon transistor and is available in the same TO-220F plastic package. It's also primarily intended for power amplification and use in audio power amplifier output stages. However, it may also be used as a switch and can drive a load of approximately -1A with a maximum load voltage of -230V from collector to emitter.
2SA1837 Pinout

2SA1837 Pinout
| Pin Number | Pin Name | Pins Description |
| 1 | Base | Used to turn ON and turn OFF the transistor (Biasing) |
| 2 | Collector | Current flows in through this and usually connected to load |
| 3 | Emitter | For current to flow out, connected with ground. |
2SA1837 CAD Model

2SA1837 Footprint
Specifications
- TypeParameter
- Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Copper, Silver, Tin - 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.
TO-220-3 Full Pack - Number of Pins3
- Supplier Device Package
The parameter "Supplier Device Package" in electronic components refers to the physical packaging or housing of the component as provided by the supplier. It specifies the form factor, dimensions, and layout of the component, which are crucial for compatibility and integration into electronic circuits and systems. The supplier device package information typically includes details such as the package type (e.g., DIP, SOP, QFN), number of pins, pitch, and overall size, allowing engineers and designers to select the appropriate component for their specific application requirements. Understanding the supplier device package is essential for proper component selection, placement, and soldering during the manufacturing process to ensure optimal performance and reliability of the electronic system.
TO-220NIS - Collector-Emitter Breakdown Voltage230V
- Current-Collector (Ic) (Max)1A
- Number of Elements1
- hFEMin100
- 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.
150°C TJ - 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.
Bulk - Published2007
- 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) - Max Operating Temperature
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
150°C - Min Operating Temperature
The "Min Operating Temperature" parameter in electronic components refers to the lowest temperature at which the component is designed to operate effectively and reliably. This parameter is crucial for ensuring the proper functioning and longevity of the component, as operating below this temperature may lead to performance issues or even damage. Manufacturers specify the minimum operating temperature to provide guidance to users on the environmental conditions in which the component can safely operate. It is important to adhere to this parameter to prevent malfunctions and ensure the overall reliability of the electronic system.
-55°C - Voltage - Rated DC
Voltage - Rated DC is a parameter that specifies the maximum direct current (DC) voltage that an electronic component can safely handle without being damaged. This rating is crucial for ensuring the proper functioning and longevity of the component in a circuit. Exceeding the rated DC voltage can lead to overheating, breakdown, or even permanent damage to the component. It is important to carefully consider this parameter when designing or selecting components for a circuit to prevent any potential issues related to voltage overload.
-230V - Max Power Dissipation
The maximum power that the MOSFET can dissipate continuously under the specified thermal conditions.
2W - Current Rating
Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.
-1A - 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.
70MHz - 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.
2SA1837 - 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.
PNP - Element Configuration
The distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
Single - 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.
2W - Power - Max
Power - Max is a parameter that specifies the maximum amount of power that an electronic component can handle without being damaged. It is typically measured in watts and indicates the upper limit of power that can be safely supplied to the component. Exceeding the maximum power rating can lead to overheating, malfunction, or permanent damage to the component. It is important to consider the power-max rating when designing circuits or systems to ensure proper operation and longevity of the electronic components.
2W - Gain Bandwidth Product
The gain–bandwidth product (designated as GBWP, GBW, GBP, or GB) for an amplifier is the product of the amplifier's bandwidth and the gain at which the bandwidth is measured.
70MHz - Transistor Type
Transistor type refers to the classification of transistors based on their operation and construction. The two primary types are bipolar junction transistors (BJTs) and field-effect transistors (FETs). BJTs use current to control the flow of current, while FETs utilize voltage to control current flow. Each type has its own subtypes, such as NPN and PNP for BJTs, and MOSFETs and JFETs for FETs, impacting their applications and characteristics in electronic circuits.
PNP - Collector Emitter Voltage (VCEO)
Collector-Emitter Voltage (VCEO) is a key parameter in electronic components, particularly in transistors. It refers to the maximum voltage that can be applied between the collector and emitter terminals of a transistor while the base terminal is open or not conducting. Exceeding this voltage limit can lead to breakdown and potential damage to the transistor. VCEO is crucial for ensuring the safe and reliable operation of the transistor within its specified limits. Designers must carefully consider VCEO when selecting transistors for a circuit to prevent overvoltage conditions that could compromise the performance and longevity of the component.
230V - Max Collector Current
Max Collector Current is a parameter used to specify the maximum amount of current that can safely flow through the collector terminal of a transistor or other electronic component without causing damage. It is typically expressed in units of amperes (A) and is an important consideration when designing circuits to ensure that the component operates within its safe operating limits. Exceeding the specified max collector current can lead to overheating, degradation of performance, or even permanent damage to the component. Designers must carefully consider this parameter when selecting components and designing circuits to ensure reliable and safe operation.
1A - DC Current Gain (hFE) (Min) @ Ic, Vce
The parameter "DC Current Gain (hFE) (Min) @ Ic, Vce" in electronic components refers to the minimum value of the DC current gain, denoted as hFE, under specific operating conditions of collector current (Ic) and collector-emitter voltage (Vce). The DC current gain hFE represents the ratio of the collector current to the base current in a bipolar junction transistor (BJT), indicating the amplification capability of the transistor. The minimum hFE value at a given Ic and Vce helps determine the transistor's performance and efficiency in amplifying signals within a circuit. Designers use this parameter to ensure proper transistor selection and performance in various electronic applications.
100 @ 100mA 5V - Current - Collector Cutoff (Max)
The parameter "Current - Collector Cutoff (Max)" refers to the maximum current at which a transistor or other electronic component will cease to conduct current between the collector and emitter terminals. This parameter is important in determining the maximum current that can flow through the component when it is in the cutoff state. Exceeding this maximum cutoff current can lead to malfunction or damage of the component. It is typically specified in the component's datasheet and is crucial for proper circuit design and operation.
1μA ICBO - Vce Saturation (Max) @ Ib, Ic
The parameter "Vce Saturation (Max) @ Ib, Ic" in electronic components refers to the maximum voltage drop across the collector-emitter junction when the transistor is in saturation mode. This parameter is specified at a certain base current (Ib) and collector current (Ic) levels. It indicates the minimum voltage required to keep the transistor fully conducting in saturation mode, ensuring that the transistor operates efficiently and does not enter the cutoff region. Designers use this parameter to ensure proper transistor operation and to prevent overheating or damage to the component.
1.5V @ 50mA, 500mA - Voltage - Collector Emitter Breakdown (Max)
Voltage - Collector Emitter Breakdown (Max) is a parameter that specifies the maximum voltage that can be applied between the collector and emitter terminals of a transistor or other semiconductor device before it breaks down and allows excessive current to flow. This parameter is crucial for ensuring the safe and reliable operation of the component within its specified limits. Exceeding the maximum breakdown voltage can lead to permanent damage or failure of the device. Designers and engineers must carefully consider this parameter when selecting components for their circuits to prevent potential issues and ensure proper functionality.
230V - Max Frequency
Max Frequency refers to the highest frequency at which an electronic component can operate effectively without degradation of performance. It is a critical parameter for devices such as transistors, capacitors, and oscillators, indicating their limitations in speed and response time. Exceeding the max frequency can lead to issues like signal distortion, heat generation, and potential failure of the component. Understanding this parameter is essential for designing circuits to ensure reliable and efficient operation.
70MHz - Frequency - Transition
The parameter "Frequency - Transition" in electronic components refers to the maximum frequency at which a signal transition can occur within the component. It is a crucial specification for digital circuits as it determines the speed at which data can be processed and transmitted. A higher frequency transition allows for faster operation and better performance of the electronic component. It is typically measured in hertz (Hz) or megahertz (MHz) and is specified by the manufacturer to ensure proper functioning of the component within a given frequency range.
70MHz - Collector Base Voltage (VCBO)
Collector Base Voltage (VCBO) is the maximum allowable voltage that can be applied between the collector and base terminals of a bipolar junction transistor when the emitter is open. It is a critical parameter that determines the voltage rating of the transistor and helps prevent breakdown in the collector-base junction. Exceeding this voltage can lead to permanent damage or failure of the component.
230V - Emitter Base Voltage (VEBO)
Emitter Base Voltage (VEBO) is a parameter used in electronic components, particularly in transistors. It refers to the maximum voltage that can be applied between the emitter and base terminals of a transistor without causing damage to the device. Exceeding this voltage limit can lead to breakdown of the transistor and potential failure. VEBO is an important specification to consider when designing circuits to ensure the proper operation and reliability of the components. It is typically provided in the datasheet of the transistor and should be carefully observed to prevent any potential damage during operation.
5V - Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - 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
2SA1837 Features
Collector-Emitter Volt (Vceo): -230V
Collector-Base Volt (Vcbo): -230V
Collector Current (Ic): -1.0A
hfe: 100-320 @ -100mA
Power Dissipation (Ptot): 20W
Transition Frequency (ft): 70MHz
Type: PNP
2SA1837 Equivalents
2SA2182, MJE5851, MJE15035, MJE5850, KTA1837, MJE15033, 2SC4793
2SA1837 Applications
High power audio amplifier applications
Audio amplifier stages
Motor Driver Circuits
Radio and RF Circuits
Drive load of up to -1A
Working of 2SA1837
2SA1837 is a PNP power transistor with a high frequency. A transistor is a semiconductor device whose primary function is to amplify a weak signal; the 2SA1837 is a PNP-configured power transistor,
The only variation is in their topology, such as Bipolar PNP, NPN, and similarly FET with N-channel and P-channel, as well as how they are designed, such as common emitter, common base, common collector, or otherwise.
The 2SA1837 transistor has three pins; current flows from the emitter to the collector pin in this PNP transistor. while the base pin controls the overall flow rate. It has the property of turning on at very low voltages, in contrast to NPN transistors, which turn on at high voltages.
The active region of the 2SA1837 high power transistor. in which the transistor functions as an amplifier, is the most adaptable working zone. The saturation or ON region is the part of a transistor's operation where it functions as a closed or complete circuit. The last region is the OFF or cutoff region, which looks like an open circuit.
Where and how to use 2SA1837?
Because the 2SA1837 is primarily intended for audio amplification, it will work well in this application. It will operate well in high-power audio amplifiers and their output stages, as previously stated. Its NPN complementary 2SC4793 transistor is usually seen in audio amplifiers. However, it is not required to be used with NPN complementary all of the time and can be used alone or with other NPN transistors in the audio amplifier.
Aside from that, it can be used as a switch and can drive up to -1A of load. It can drive a variety of loads with its -1A load driving capacity, including relay switches, high-power transistors, motors, bulbs, LEDs, and even a portion of a circuit.
How to run the circuit safely
Always operate this transistor 20 percent below its absolute maximum ratings to get long-term performance. Because the transistor's maximum collector current is -1A, do not drive a load that draws more than -800mA. Because the maximum collector to emitter voltage is -230V, do not drive a load more than -180V and do not store or use the transistor at temperatures higher than -55°C and lower than +150°C.
2SA1837 Dimensions

2SA1837 Dimensions
2SA1837 Manufacturer
Toshiba Semiconductor & Storage offers a broad range of enabling technology solutions that allow OEMs, ODMs, CMs, and fabless chip companies to develop advanced integrated products for computing, networking, and communications, and digital consumer, automotive, and other markets.
Datasheet PDF
- Datasheets :
What is 2SA1837 used for?
A1837 PNP 1A 230V transistor is used for power amplifier applications, driver stage amplifier applications, etc.
How does 2SA1837 work?
2SA1837 has three pins, in this PNP transistor current flows from emitter to collector pin whereas, the base pin controls the overall flow rate. It has the property that it turns ON at very low signal that is the opposite of the NPN transistor which turns ON at high signal.
ADIS16477-2BMLZ Alternatives: Industrial Sensor Substitutes and Sourcing Guide07 June 2025146
LR44 VS A76[Video+FAQ]: Are they interchangeable?26 April 202226085
2N3819 JFET: Substitute, Pinout and Datasheet23 August 20217571
TDA7377 Class AB Car Radio Amplifier: Pinout, Datasheet pdf and Circuit07 December 202126571
ST-LINK/V2 Programmer/Debugger/Emulators STM8 and STM32 microcontrollers: Datasheet, Pinout14 January 202218548
MIC4605 MOSFET Driver: Pinout, Equivalent and Datasheet16 December 20213112
TMC5160 vs. TMC2209: How to Differentiate?18 April 202220832
CD4066B Bilateral Switch: Features, Speicifications and Applications20 May 20211815
How Does the A4988 Stepper Motor Driver Work27 February 20236378
The Comprehensive Guide to MOSFETs: Principles, Types, and Parameters (2026 Edition)16 January 202619922
How to Select a Digital Isolator?12 April 20217119
Global Ceramic Capacitors Market In-Depth Analysis to 202510 December 20257693
What are Tilt Sensors?19 December 20207495
What is Electronic Ballast?28 September 202015202
Comprehensive Guide to Xilinx SoC Boards and Tools04 June 2025762
Introduction to USB Type-C20 February 20232638
Toshiba Semiconductor and Storage
In Stock: 30000
United States
China
Canada
Japan
Russia
Germany
United Kingdom
Singapore
Italy
Hong Kong(China)
Taiwan(China)
France
Korea
Mexico
Netherlands
Malaysia
Austria
Spain
Switzerland
Poland
Thailand
Vietnam
India
United Arab Emirates
Afghanistan
Åland Islands
Albania
Algeria
American Samoa
Andorra
Angola
Anguilla
Antigua & Barbuda
Argentina
Armenia
Aruba
Australia
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Belarus
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Bonaire, Sint Eustatius and Saba
Bosnia & Herzegovina
Botswana
Brazil
British Indian Ocean Territory
British Virgin Islands
Brunei
Bulgaria
Burkina Faso
Burundi
Cabo Verde
Cambodia
Cameroon
Cayman Islands
Central African Republic
Chad
Chile
Christmas Island
Cocos (Keeling) Islands
Colombia
Comoros
Congo
Congo (DRC)
Cook Islands
Costa Rica
Côte d’Ivoire
Croatia
Cuba
Curaçao
Cyprus
Czechia
Denmark
Djibouti
Dominica
Dominican Republic
Ecuador
Egypt
El Salvador
Equatorial Guinea
Eritrea
Estonia
Eswatini
Ethiopia
Falkland Islands
Faroe Islands
Fiji
Finland
French Guiana
French Polynesia
Gabon
Gambia
Georgia
Ghana
Gibraltar
Greece
Greenland
Grenada
Guadeloupe
Guam
Guatemala
Guernsey
Guinea
Guinea-Bissau
Guyana
Haiti
Honduras
Hungary
Iceland
Indonesia
Iran
Iraq
Ireland
Isle of Man
Israel
Jamaica
Jersey
Jordan
Kazakhstan
Kenya
Kiribati
Kosovo
Kuwait
Kyrgyzstan
Laos
Latvia
Lebanon
Lesotho
Liberia
Libya
Liechtenstein
Lithuania
Luxembourg
Macao(China)
Madagascar
Malawi
Maldives
Mali
Malta
Marshall Islands
Martinique
Mauritania
Mauritius
Mayotte
Micronesia
Moldova
Monaco
Mongolia
Montenegro
Montserrat
Morocco
Mozambique
Myanmar
Namibia
Nauru
Nepal
New Caledonia
New Zealand
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
North Korea
North Macedonia
Northern Mariana Islands
Norway
Oman
Pakistan
Palau
Palestinian Authority
Panama
Papua New Guinea
Paraguay
Peru
Philippines
Pitcairn Islands
Portugal
Puerto Rico
Qatar
Réunion
Romania
Rwanda
Samoa
San Marino
São Tomé & Príncipe
Saudi Arabia
Senegal
Serbia
Seychelles
Sierra Leone
Sint Maarten
Slovakia
Slovenia
Solomon Islands
Somalia
South Africa
South Sudan
Sri Lanka
St Helena, Ascension, Tristan da Cunha
St. Barthélemy
St. Kitts & Nevis
St. Lucia
St. Martin
St. Pierre & Miquelon
St. Vincent & Grenadines
Sudan
Suriname
Svalbard & Jan Mayen
Sweden
Syria
Tajikistan
Tanzania
Timor-Leste
Togo
Tokelau
Tonga
Trinidad & Tobago
Tunisia
Turkey
Turkmenistan
Turks & Caicos Islands
Tuvalu
U.S. Outlying Islands
U.S. Virgin Islands
Uganda
Ukraine
Uruguay
Uzbekistan
Vanuatu
Vatican City
Venezuela
Wallis & Futuna
Yemen
Zambia
Zimbabwe


Product
Brand
Articles
Tools










