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

onsemi BD436TG

Name: BD436TG
Brand: onsemi
SKU: BD436TG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD436TG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BD436TG.pdf

Description:: TRANS PNP 32V 4A TO-126

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD436TG from onsemi is a plastic medium-power silicon PNP transistor rated for 32 V_CEO, 4.0 A collector current, and 36 W total device dissipation at T_C = 25°C; it operates across –55°C to +150°C junction temperature and is used in linear amplifiers and switching power stages in industrial control and power supply circuits.

For engineers reviewing the BD436TG datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO = 32 V, h_FE = 40–475 (depending on I_C), V_CE(sat) ≤ 0.5 V at I_C = 2.0 A/I_B = 0.2 A, TO-225 package thermal resistance R_JC = 3.5°C/W, and Pb-free RoHS compliance.

Technical Context

This PNP bipolar junction transistor features a single-die silicon structure optimized for medium-power linear amplification and hard-switching duty. Its DC current gain spans h_FE = 40 (I_C = 10 mA) to 85 (I_C = 500 mA) and drops to 50 at I_C = 2.0 A, with f_T = 3.0 MHz confirming audio and low-frequency switching suitability.

The device uses a TO-225 package with Collector connected to pins 2 and 4, Emitter to pin 1, and Base to pin 3 - enabling robust heat transfer via case mounting and supporting safe operating area (SOA) up to 2.0 A at V_CE ≤ 10 V under DC conditions per Figure 4.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	32 V - Maximum collector-emitter voltage before breakdown; defines upper rail limit in PNP switch or amplifier stage.
I_C	4.0 A - Continuous collector current rating; supports load switching up to ~30 W at 12 V with adequate heatsinking.
P_D @ T_C = 25°C	36 W - Total device power dissipation at case temperature 25°C; requires thermal design with R_JC = 3.5°C/W path.
h_FE (I_C = 10 mA)	40 min - Sufficient for low-current driver stages; enables stable biasing in Class-A amplifiers or relay drivers.
V_CE(sat)	≤ 0.5 V @ I_C/I_B = 10 - Low saturation voltage reduces conduction loss in switching applications like motor control or power OR-ing.
f_T	3.0 MHz - Bandwidth suitable for audio amplification and PWM frequencies up to ~300 kHz with gain margin.

Pinout & Package

BD436TG is housed in a TO-225 package (Case 77-09, Style 1), with metal tab electrically connected to Collector. The package provides mechanical stability and thermal conduction via mounting surface contact.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Current exit node; connects to ground or low-side reference in common-emitter configurations.
Pins 2 & 4	Collector	High-current input node tied to positive rail in PNP switch; dual-pin layout improves current handling and thermal spreading.
Pin 3	Base	Control terminal requiring ~0.2 A drive for full saturation at 2.0 A collector current; referenced to emitter potential.

Key Features

Feature	Design Value
Pb-Free / RoHS Compliant	Meets EU Directive 2011/65/EU; eliminates lead in soldering and packaging without performance trade-off.
TO-225 Mechanical Outline	Standardized 3-lead power package with backside collector tab; compatible with existing heatsink footprints and mounting hardware.
Wide Operating Temperature	–55°C to +150°C junction range supports deployment in industrial motor drives and automotive under-hood environments.
Complementary Pair Availability	BD437G is documented as complementary NPN type; enables push-pull output stage design with matched voltage/current ratings.

Applications

Industrial Power Supply Regulation	DC Motor Direction Control
Use Scenario: Regulating output voltage in 24 V offline SMPS using discrete PNP pass transistor in series with load. IC Role / Device Role / Timing Role: PNP series pass element controlling current flow between input and regulated output rail. Use Value: V_CEO = 32 V and I_C = 4.0 A allow operation with 28 V input headroom and 2 A continuous load current.	Use Scenario: Driving H-bridge high-side leg in brushed DC motor controller for forward/reverse polarity switching. IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current flow through motor winding. Use Value: V_CE(sat) ≤ 0.5 V minimizes voltage drop and heat generation during active conduction phase.
Audio Power Amplifier Output Stage	Relay Driver Circuit
Use Scenario: Delivering 5–10 W into 8 Ω speaker load in Class-AB amplifier output stage with complementary NPN/PNP pair. IC Role / Device Role / Timing Role: Negative-rail output transistor sinking current from speaker to ground during negative half-cycle. Use Value: f_T = 3.0 MHz ensures flat frequency response up to 20 kHz with sufficient gain margin.	Use Scenario: Switching 12 V/1 A electromechanical relay coil in PLC I/O module with microcontroller GPIO interface. IC Role / Device Role / Timing Role: Medium-power switching transistor isolating logic-level control signal from inductive load. Use Value: h_FE ≥ 40 at I_C = 10 mA allows direct drive from 3.3 V MCU with 10 kΩ base resistor.

Industrial Power Supply Regulation

DC Motor Direction Control

Use Scenario: Regulating output voltage in 24 V offline SMPS using discrete PNP pass transistor in series with load.

IC Role / Device Role / Timing Role: PNP series pass element controlling current flow between input and regulated output rail.

Use Value: V_CEO = 32 V and I_C = 4.0 A allow operation with 28 V input headroom and 2 A continuous load current.

Use Scenario: Driving H-bridge high-side leg in brushed DC motor controller for forward/reverse polarity switching.

IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current flow through motor winding.

Use Value: V_CE(sat) ≤ 0.5 V minimizes voltage drop and heat generation during active conduction phase.

Audio Power Amplifier Output Stage

Relay Driver Circuit

Use Scenario: Delivering 5–10 W into 8 Ω speaker load in Class-AB amplifier output stage with complementary NPN/PNP pair.

IC Role / Device Role / Timing Role: Negative-rail output transistor sinking current from speaker to ground during negative half-cycle.

Use Value: f_T = 3.0 MHz ensures flat frequency response up to 20 kHz with sufficient gain margin.

Use Scenario: Switching 12 V/1 A electromechanical relay coil in PLC I/O module with microcontroller GPIO interface.

IC Role / Device Role / Timing Role: Medium-power switching transistor isolating logic-level control signal from inductive load.

Use Value: h_FE ≥ 40 at I_C = 10 mA allows direct drive from 3.3 V MCU with 10 kΩ base resistor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD436G	Same die and electrical specs; differs only in packaging - bulk box (500 units) vs. rail (50 units); identical TO-225 footprint and marking.	No functional difference; BD436G suits high-volume production; BD436TG preferred for prototyping or small-batch builds.	Select BD436TG when rail packaging simplifies manual assembly or evaluation; no design or layout change required.
MJD44H11T4G	Higher V_CEO = 80 V, same I_C = 4.0 A, but h_FE = 30–120 (min/max) and R_JC = 4.0°C/W - slightly lower thermal efficiency.	Better suited for 48 V systems; less optimal for 24 V designs where BD436TG's tighter V_CEO margin improves SOA utilization.	Choose MJD44H11T4G only if higher voltage headroom is needed; otherwise BD436TG offers better gain consistency at low I_C.

Compared with BD436G and MJD44H11T4G, BD436TG delivers identical electrical performance to BD436G in rail format while offering superior h_FE stability at I_C < 500 mA versus MJD44H11T4G - making it optimal for precision biasing and low-noise amplifier stages.

Availability

BD436TG is available at Aetrix Electronics and suitable for industrial power supply regulation, DC motor direction control, and audio power amplifier output stages requiring stable component supply and RoHS-compliant medium-power PNP transistors.

Supply support for BD436TG 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

BD436TG belongs to the BD4xxG family of medium-power PNP transistors designed specifically for cost-sensitive, thermally constrained linear and switching applications in industrial controls and legacy power systems.

FAQ

What is the maximum collector-emitter voltage rating for BD436TG?

The BD436TG has a maximum collector-emitter voltage (V_CEO) rating of 32 Vdc, verified under test condition I_C = 100 mA and I_B = 0. This rating defines the absolute upper limit for voltage applied between collector and emitter terminals before breakdown occurs. Exceeding this value risks permanent device failure. The BD436TG datasheet confirms this parameter in both Maximum Ratings and Electrical Characteristics tables.

Is BD436TG pin-compatible with BD436G?

Yes, BD436TG is fully pin-compatible with BD436G - both use identical TO-225 package (Case 77-09, Style 1) with Collector on pins 2 and 4, Emitter on pin 1, and Base on pin 3. The only distinction is packaging format: BD436TG ships in 50-unit rails for prototyping, while BD436G ships in 500-unit boxes. No PCB redesign or layout change is needed when substituting BD436TG for BD436G.

What is the typical DC current gain (h_FE) of BD436TG at 10 mA collector current?

The BD436TG exhibits a minimum DC current gain (h_FE) of 40 when tested at I_C = 10 mA and V_CE = 5.0 V, per the Electrical Characteristics table. Typical values reach up to 150 under those conditions, and the device maintains usable gain up to 475 at I_C = 500 mA. This makes BD436TG suitable for both low-current bias networks and moderate-power switching stages.

Does BD436TG require a heatsink in standard operation?

BD436TG can operate without an external heatsink only at very low power levels (< 2 W). At its full 36 W dissipation rating, a heatsink is mandatory to maintain T_J ≤ 150°C given R_JC = 3.5°C/W and ambient thermal resistance. For example, at 10 W dissipation and 25°C ambient, a heatsink with R_JA ≤ 11.5°C/W is required. Thermal design must account for mounting pressure, thermal interface material, and airflow.

What is the complementary NPN transistor for BD436TG?

The complementary NPN transistor for BD436TG is BD437G, as explicitly stated in the onsemi datasheet under "Features" and "Complementary types". BD437G matches BD436TG in package (TO-225), voltage rating (V_CEO = 32 V), current rating (I_C = 4.0 A), and thermal characteristics - enabling symmetrical push-pull or Class-B amplifier designs without gain or timing mismatch.

BD436TG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 32 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 200mA, 2A

Current - Collector Cutoff (Max):: 100µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 85 @ 500mA, 1V

Power - Max:: 36 W

Frequency - Transition:: 3MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

BD436TG FAQ

1.How can I place an order for BD436TG through Aetrix?

Please submit a Request for Quotation (RFQ) for BD436TG 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 BD436TG reliable?

The price and inventory of BD436TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD436TG is usually 5 days.

3.What payment methods are accepted for BD436TG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD436TG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD436TG?

BD436TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD436TG 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 BD436TG?

For technical support, including BD436TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD436TG requirements.

6.How does Aetrix verify that BD436TG is sourced from the original manufacturer or authorized distributors?

All BD436TG 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 BD436TG meets industry standards.

7.What is the process for return or replacement of BD436TG?

All BD436TG units undergo pre-shipment inspection (PSI). If there is an issue with BD436TG, 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 BD436TG part is unused and in its original packaging.

Return procedure for BD436TG:

1.Submit a request within 90 days.

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

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