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

onsemi BD1376STU

Name: BD1376STU
Brand: onsemi
SKU: BD1376STU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD1376STU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BD1376STU.pdf

Description:: TRANS NPN 60V 1.5A TO-126-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD1376STU from Fairchild Semiconductor is an NPN epitaxial silicon transistor in TO-126 package, rated for 60 V V_CEO, 1.5 A DC collector current, and 12.5 W collector dissipation at T_C = 25°C, used in medium-power linear amplification and switching applications such as audio output stages and power supply regulators.

For engineers reviewing the BD1376STU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO rating, h_FE classification (63–160 at I_C = 150 mA), V_CE(sat) ≤ 0.5 V, thermal derating behavior, and complementary pairing with BD138.

Technical Context

This device operates as a medium-power bipolar junction transistor with fixed emitter-base-collector terminal assignment (Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base). Its h_FE is specified across three test conditions-25–250 at I_C = 5 mA, 25–160 at I_C = 0.5 A, and 63–160 at I_C = 150 mA-supporting both small-signal gain stability and high-current switching fidelity.

The BD1376STU exhibits V_CE(sat) ≤ 0.5 V at I_C = 500 mA / I_B = 50 mA and V_BE(on) ≈ 1.0 V under same conditions, enabling predictable base drive design in Class AB amplifier outputs and relay drivers where low saturation loss and controlled turn-on threshold are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (DC)	1.5 A - Continuous collector current limit defining steady-state power handling capability
P_C (T_C=25°C)	12.5 W - Maximum power dissipation achievable with heatsink at case temperature of 25°C
h_FE (I_C=150 mA)	63–160 - DC current gain range determining base drive requirements for linear/saturated operation
V_CE(sat)	≤0.5 V - Saturation voltage at I_C=500 mA/I_B=50 mA, directly impacting conduction loss in switching use
T_J	150°C - Maximum allowable junction temperature, setting thermal design margin for PCB layout and heatsinking

Pinout & Package

BD1376STU is housed in a TO-126 plastic package with standardized 3-pin configuration: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. The package features a metal tab (electrically connected to Collector) for mechanical mounting and thermal conduction to heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Connected to ground or low-side reference; determines emitter-follower or common-emitter topology
2 (Collector)	Current entry path for majority carriers	Electrically tied to metal tab; requires isolation washer when mounted to heatsink unless referenced to system ground
3 (Base)	Control terminal modulating collector current	Driven by resistor-limited voltage source; base current must be sized per h_FE and target I_C

Key Features

Feature	Design Value
Complementary pairing	Designed as NPN counterpart to BD138 PNP, enabling push-pull output stage implementation without gain mismatch
Medium-power SOA	Defined Safe Operating Area supports pulsed I_C up to 3.0 A with 10 µs–DC envelope, suitable for transient load handling
Thermal derating curve	Linear power reduction from 12.5 W at 25°C to 0 W at 150°C case temperature, enabling precise thermal margin calculation
Low V_CE(sat)	Guaranteed ≤0.5 V at I_C/I_B = 10, minimizing conduction loss in switching regulators and motor drivers

Applications

Audio Power Amplifier Output Stage	Linear Voltage Regulator Pass Element
Use Scenario: Final output stage in 5–15 W class AB audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power transistor delivering amplified current to speaker load while maintaining linearity and thermal stability. Use Value: V_CEO = 60 V and h_FE ≥ 63 ensure headroom for rail voltages up to ±25 V and stable bias control under varying load impedance.	Use Scenario: Series pass element in adjustable linear regulators supplying 1–1.5 A to microcontroller subsystems. IC Role / Device Role / Timing Role: Current-controlled series regulator transistor dissipating excess input-output differential voltage. Use Value: P_C = 12.5 W at T_C = 25°C enables reliable operation at 12 V dropout × 1 A = 12 W dissipation with appropriate heatsinking.
DC Motor Driver (Low-Side Switch)	Relay Driver Circuit
Use Scenario: Low-side switch controlling brushed DC motors up to 24 V / 1 A in industrial actuators. IC Role / Device Role / Timing Role: Saturated NPN switch turning motor winding on/off via microcontroller GPIO. Use Value: V_CE(sat) ≤ 0.5 V limits resistive loss to <0.5 W at 1 A, reducing self-heating and improving efficiency over alternatives.	Use Scenario: Driving 12 V/24 V electromagnetic relays requiring 50–100 mA coil current in PLC I/O modules. IC Role / Device Role / Timing Role: Digital interface transistor translating logic-level signals into sufficient coil drive current. Use Value: h_FE ≥ 63 at I_C = 150 mA ensures full saturation with ≤2.5 mA base drive, compatible with standard MCU output pins.

Audio Power Amplifier Output Stage

Linear Voltage Regulator Pass Element

Use Scenario: Final output stage in 5–15 W class AB audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power transistor delivering amplified current to speaker load while maintaining linearity and thermal stability.

Use Value: V_CEO = 60 V and h_FE ≥ 63 ensure headroom for rail voltages up to ±25 V and stable bias control under varying load impedance.

Use Scenario: Series pass element in adjustable linear regulators supplying 1–1.5 A to microcontroller subsystems.

IC Role / Device Role / Timing Role: Current-controlled series regulator transistor dissipating excess input-output differential voltage.

Use Value: P_C = 12.5 W at T_C = 25°C enables reliable operation at 12 V dropout × 1 A = 12 W dissipation with appropriate heatsinking.

DC Motor Driver (Low-Side Switch)

Relay Driver Circuit

Use Scenario: Low-side switch controlling brushed DC motors up to 24 V / 1 A in industrial actuators.

IC Role / Device Role / Timing Role: Saturated NPN switch turning motor winding on/off via microcontroller GPIO.

Use Value: V_CE(sat) ≤ 0.5 V limits resistive loss to <0.5 W at 1 A, reducing self-heating and improving efficiency over alternatives.

Use Scenario: Driving 12 V/24 V electromagnetic relays requiring 50–100 mA coil current in PLC I/O modules.

IC Role / Device Role / Timing Role: Digital interface transistor translating logic-level signals into sufficient coil drive current.

Use Value: h_FE ≥ 63 at I_C = 150 mA ensures full saturation with ≤2.5 mA base drive, compatible with standard MCU output pins.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD137G	Same electrical specs and TO-126 package; RoHS-compliant variant with green marking	No functional difference; identical pinout and thermal profile	Select BD137G for new designs requiring lead-free compliance and updated environmental certification
MJD137	TO-252 (DPAK) package; otherwise matches V_CEO, I_C, h_FE, and P_C ratings	Suitable for surface-mount assembly; requires PCB re-layout due to different footprint and thermal pad connection	Choose MJD137 when transitioning from through-hole to SMT production or when board space constraints prohibit TO-126 mounting

Compared with BD1376STU, BD137G offers identical performance with RoHS compliance, while MJD137 provides equivalent electrical behavior in a surface-mount package-enabling either drop-in replacement in legacy through-hole systems or modernized SMT integration depending on manufacturing requirements.

Availability

BD1376STU is available at Aetrix Electronics and suitable for audio amplifier output stages, linear voltage regulator pass elements, and DC motor driver circuits requiring stable component supply and long-term industrial availability.

Supply support for BD1376STU 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BD1376STU belongs to Fairchild's legacy medium-power bipolar transistor family designed for robust linear amplification and switching in industrial, consumer audio, and power supply applications.

FAQ

What is the pin configuration of BD1376STU?

The BD1376STU uses a standard TO-126 pinout: Pin 1 is Emitter, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Base. This arrangement is consistent across the BD135/137/139 family and confirmed in Fairchild's February 2000 datasheet Rev. A. Correct orientation is essential to avoid reverse-bias damage during PCB layout and assembly of BD1376STU.

Does BD1376STU have a guaranteed h_FE range?

Yes, BD1376STU has a guaranteed h_FE range of 63–160 when measured at V_CE = 2 V and I_C = 150 mA. This classification (h_FE3) is explicitly defined in the datasheet's Electrical Characteristics table and applies to all BD137 devices, ensuring predictable base drive sizing for both linear and saturated operation of BD1376STU.

Can BD1376STU replace BD137 in existing designs?

Yes, BD1376STU is a direct functional and mechanical replacement for BD137, sharing identical absolute maximum ratings, electrical characteristics, TO-126 package dimensions, and pinout. No circuit or layout changes are required when substituting BD1376STU for BD137, making it suitable for continuity support and obsolescence mitigation in legacy BD1376STU-based systems.

What is the maximum safe operating temperature for BD1376STU?

The BD1376STU has a maximum junction temperature (T_J) of 150°C and storage temperature range of –55°C to +150°C. Its power dissipation must be derated linearly above 25°C case temperature-reducing from 12.5 W at T_C = 25°C to zero at T_C = 150°C. Thermal design for BD1376STU must ensure T_J remains below 150°C under worst-case ambient and load conditions.

Is BD1376STU suitable for switching applications?

Yes, BD1376STU is qualified for switching use with I_CP = 3.0 A (pulse), V_CE(sat) ≤ 0.5 V at I_C = 500 mA/I_B = 50 mA, and defined Safe Operating Area curves. Its switching speed is not specified in the datasheet, but the device reliably handles repetitive pulse loads in relay drivers and low-frequency PWM motor control when operated within its SOA limits for BD1376STU.

BD1376STU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 150mA, 2V

Power - Max:: 1.25 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126-3

BD1376STU FAQ

1.How can I place an order for BD1376STU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD1376STU 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 BD1376STU reliable?

The price and inventory of BD1376STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD1376STU is usually 5 days.

3.What payment methods are accepted for BD1376STU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD1376STU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD1376STU?

BD1376STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD1376STU 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 BD1376STU?

For technical support, including BD1376STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD1376STU requirements.

6.How does Aetrix verify that BD1376STU is sourced from the original manufacturer or authorized distributors?

All BD1376STU 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 BD1376STU meets industry standards.

7.What is the process for return or replacement of BD1376STU?

All BD1376STU units undergo pre-shipment inspection (PSI). If there is an issue with BD1376STU, 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 BD1376STU part is unused and in its original packaging.

Return procedure for BD1376STU:

1.Submit a request within 90 days.

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

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