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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics 2N6036

Name: 2N6036
Brand: STMicroelectronics
SKU: 2N6036
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N6036

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2N6036.pdf

Description:: TRANS PNP DARL 80V 4A SOT-32

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N6036 from STMicroelectronics is a complementary PNP silicon power Darlington transistor with integrated antiparallel collector-emitter diode, rated for V_CEO = 80 V, I_C = 4 A, P_tot = 40 W at T_c ≤ 25 °C, and R_thj-case = 3.12 °C/W - used in high-current DC switching circuits such as motor control and relay drivers.

For engineers reviewing the 2N6036 datasheet, 2N6036 pinout, 2N6036 application, or 2N6036 equivalent, key selection criteria include guaranteed h_FE ≥ 500 at I_C = 0.5 A, V_CE(sat) ≤ 2 V at I_C = 2 A / I_B = 8 mA, integrated freewheel diode forward voltage, thermal resistance, and SOT-32 (TO-126) mechanical compatibility.

Technical Context

The 2N6036 operates as a high-gain, medium-power PNP Darlington pair with built-in base resistors (R1 ≈ 7 kΩ, R2 ≈ 230 Ω) and an integrated antiparallel diode across C–E terminals, enabling self-commutated inductive load switching without external flyback protection. It is designed for DC-coupled linear and saturated switching modes.

Its complementary pairing with the NPN 2N6039 supports push-pull output stages and H-bridge configurations. The device exhibits V_BE(sat) = 4 V at I_C = 4 A / I_B = 40 mA and maintains h_FE ≥ 100 even at I_C = 4 A, supporting robust current amplification under heavy load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration with base open.
I_C	4 A continuous - Sustained collector current capability at case temperature ≤25 °C; derates above 25 °C per R_thj-case = 3.12 °C/W.
h_FE	500–15000 - DC current gain range ensures reliable base drive scaling across 0.5–4 A load currents.
V_CE(sat)	2 V @ I_C=2 A/I_B=8 mA - Low saturation voltage minimizes conduction loss in switching applications.
R_thj-case	3.12 °C/W - Thermal resistance from junction to case enables direct heatsink mounting for 40 W dissipation at T_c = 25 °C.
Integrated Diode	Antiparallel C–E - Enables intrinsic flyback path for inductive loads; eliminates need for external freewheel diode in relay/motor drivers.

Pinout & Package

SOT-32 (TO-126) plastic package with three leads: emitter tab (case), collector (center lead), base (left lead when tab facing down). Mounting surface is electrically connected to emitter.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (Tab)	Power return node and thermal interface	Electrically tied to metal tab; must be isolated or grounded per layout; primary heat path to heatsink.
Collector (Center)	Main current sink terminal	Connected internally to collector region; carries full load current; requires low-inductance routing.
Base (Left)	Control input with integrated bias network	Internally connected to R1 (7 kΩ) and R2 (230 Ω); accepts TTL/CMOS-compatible logic-level drive.

Key Features

Feature	Design Value
Integrated antiparallel diode	Eliminates discrete flyback diode in relay/motor driver designs, reducing BOM count and PCB area.
Built-in base resistors	R1 ≈ 7 kΩ + R2 ≈ 230 Ω enable direct logic-level drive without external base resistor calculation or placement.
High h_FE at full current	h_FE ≥ 100 at I_C = 4 A ensures stable saturation with modest base drive (I_B = 40 mA).
TO-126 mechanical standard	Industry-standard SOT-32 footprint allows drop-in replacement in legacy power transistor layouts.

Applications

DC Motor Driver Stage

Relay Driver Circuit

Use Scenario: Driving 24 V, 3 A brushed DC motors in industrial actuators with PWM-controlled direction reversal.

IC Role / Device Role / Timing Role: PNP Darlington switch providing high-side current sinking in half-bridge configuration.

Use Value: Integrated freewheel diode clamps inductive kickback during PWM off-time, preventing voltage spikes >80 V at collector.

Use Scenario: Controlling 12 V/2 A electromagnetic relays in PLC I/O modules with microcontroller GPIO outputs.

IC Role / Device Role / Timing Role: High-gain current amplifier translating 3.3 V/5 mA MCU signal into 4 A relay coil drive.

Use Value: Built-in base resistors eliminate external components; V_CE(sat) ≤ 2 V ensures <8 W dissipation at full coil current.

Linear Power Regulator Pass Element

High-Current LED Dimming Switch

Use Scenario: Series pass transistor in adjustable 0–30 V/3 A bench power supply with analog voltage control loop.

IC Role / Device Role / Timing Role: Linear-mode PNP regulator element dissipating up to 40 W with active thermal management.

Use Value: R_thj-case = 3.12 °C/W enables stable operation at T_j ≤ 150 °C with 25 °C heatsink interface.

Use Scenario: Constant-current switching for 48 V, 3.5 A high-brightness LED strings in signage systems.

IC Role / Device Role / Timing Role: Saturated-switching current controller modulated via 1 kHz PWM from microcontroller.

Use Value: h_FE ≥ 500 at I_C = 2 A ensures <10 mA base drive requirement, compatible with standard GPIO pins.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power Darlington switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD6036	Same die, SOT-223 package; lower P_tot (1.5 W), no integrated diode, R_thj-amb = 83.3 °C/W.	Not suitable for >1 A loads or inductive switching without external diode and heatsink.	Select only for space-constrained low-power linear or switching use with external protection.
TIP2955	Standard PNP power transistor (non-Darlington); h_FE = 20–70, no internal diode or base resistors, V_CEO = 100 V.	Requires external base resistor and freewheel diode; higher base drive current needed (≥150 mA at I_C = 4 A).	Choose when higher V_CEO margin is critical and board space allows added components.

Compared with MJD6036 and TIP2955, the 2N6036 uniquely combines high h_FE, integrated diode, and TO-126 thermal performance - making it optimal for cost-sensitive, medium-power inductive switching where component count and thermal reliability are prioritized.

Availability

2N6036 is available at Aetrix Electronics and suitable for DC motor drivers, relay interface modules, linear power supplies, and high-current LED dimmers requiring stable component supply and long-term industrial availability.

Supply support for 2N6036 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The 2N6036 belongs to ST's legacy power bipolar transistor family, engineered specifically for robust, low-component-count switching in industrial control and power conversion systems where reliability and thermal performance are critical.

FAQ

Is the 2N6036 pin-compatible with the 2N6039?

No - the 2N6036 (PNP) and 2N6039 (NPN) are complementary devices with identical SOT-32 pinout but opposite polarity. Pin 1 (base), Pin 2 (collector), Pin 3 (emitter/tab) are physically aligned, but electrical behavior and biasing are inverted. They are intended for paired use in push-pull or H-bridge topologies, not direct substitution.

Does the integrated diode support bidirectional current flow?

No - the integrated antiparallel diode conducts only from emitter to collector (forward-biased when V_E > V_C). It functions solely as a freewheel path for inductive energy recovery during turn-off and does not enable reverse current conduction in normal operation.

What is the maximum safe operating frequency for PWM switching?

The 2N6036 is optimized for DC and low-frequency switching (≤10 kHz). Its f_T is not specified, and h_fe = 25 at f = 1 kHz confirms limited small-signal bandwidth. For >10 kHz PWM, switching losses rise significantly due to slow turn-off caused by minority-carrier storage time in the Darlington structure.

Can the emitter tab be left electrically floating?

No - the emitter tab is internally connected to the emitter terminal and serves as the primary thermal and electrical return path. Leaving it unconnected violates the absolute maximum rating for V_EBO and risks thermal runaway or premature failure. It must be electrically bonded to circuit ground or the designated emitter node and thermally mounted to a heatsink.

2N6036 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 40mA, 4A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 2A, 3V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-32

2N6036 FAQ

1.How can I place an order for 2N6036 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N6036 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2N6036 reliable?

The price and inventory of 2N6036 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N6036 is usually 5 days.

3.What payment methods are accepted for 2N6036?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N6036 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N6036?

2N6036 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N6036 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2N6036?

For technical support, including 2N6036 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N6036 requirements.

6.How does Aetrix verify that 2N6036 is sourced from the original manufacturer or authorized distributors?

All 2N6036 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2N6036 meets industry standards.

7.What is the process for return or replacement of 2N6036?

All 2N6036 units undergo pre-shipment inspection (PSI). If there is an issue with 2N6036, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2N6036 part is unused and in its original packaging.

Return procedure for 2N6036:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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