Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi BD13910STU

Name: BD13910STU
Brand: onsemi
SKU: BD13910STU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BD13910STU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BD13910STU.pdf

Description:: TRANS NPN 80V 1.5A TO-126-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,403

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BD13910STU from Fairchild Semiconductor is an NPN epitaxial silicon transistor in TO-126 package, rated for 80 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 relay drivers.

For engineers reviewing the BD13910STU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO = 80 V, h_FE = 100–250 (Class 10), V_CE(sat) ≤ 0.5 V at I_C = 500 mA / I_B = 50 mA, and TO-126 thermal performance with case-mounted heatsinking.

Technical Context

The BD13910STU is a medium-power general-purpose NPN bipolar junction transistor optimized for linear and switching operation in discrete amplifier and power control circuits. It features a V_CEO of 80 V, V_CBO of 80 V, and guaranteed h_FE range of 100–250 at I_C = 150 mA and V_CE = 2 V - consistent with its "Class 10" h_FE3 classification per Fairchild's BD135/137/139 family specification.

Its safe operating area supports pulsed collector currents up to 3.0 A and continuous operation up to 1.5 A with appropriate heatsinking. Thermal derating begins at T_C > 25°C, with full power (12.5 W) only available at case temperature ≤ 25°C and linear reduction to zero at T_C = 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum allowable collector-emitter voltage before breakdown; defines safe voltage headroom in switching or amplifier rails.
I_C (DC)	1.5 A - continuous collector current limit; determines max sustained load drive capability without thermal runaway.
P_C (T_C=25°C)	12.5 W - maximum power dissipation at case temperature 25°C; requires mechanical heatsink mounting for full rating.
h_FE (I_C=150 mA)	100–250 - DC current gain range at mid-current bias; enables predictable base drive sizing in linear or saturated switch designs.
V_CE(sat)	≤0.5 V @ I_C=500 mA, I_B=50 mA - low saturation voltage ensures <0.25 W conduction loss in switching mode.
T_J	150 °C - maximum junction temperature; sets absolute thermal limit for reliability under worst-case ambient + self-heating.

Pinout & Package

BD13910STU uses the TO-126 package: molded plastic case with metal tab for heatsinking, 3-pin vertical configuration, and standardized lead spacing per JEDEC TO-126 outline. Pin 1 is Emitter, Pin 2 is Collector (connected to tab), Pin 3 is Base.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path from transistor	Common reference node in common-emitter configurations; must be routed with low-inductance path for stability.
2 (Collector)	Current entry path into transistor	Internally bonded to metal tab - electrically active and thermally critical; requires insulated mounting if not at ground potential.
3 (Base)	Control terminal for minority-carrier injection	High-impedance input requiring current-limited drive; sensitive to ESD and overvoltage transients.

Key Features

Feature	Design Value
High V_CEO rating	80 V enables use in 48 V industrial supplies and 24 V automotive auxiliary circuits without derating.
Guaranteed h_FE binning	Class 10 (100–250) ensures consistent base drive requirements across production lots.
Low V_CE(sat)	≤0.5 V at I_C/I_B = 10 reduces conduction losses and improves efficiency in saturated-switch applications.
TO-126 thermal interface	Metal tab allows direct mechanical attachment to heatsinks, enabling 12.5 W dissipation with proper thermal interface material.

Applications

Audio Power Amplifier Output Stage	DC Motor Driver (Small Brushed)
Use Scenario: Final push-pull stage in Class AB audio amplifiers delivering up to 10 W into 8 Ω loads. IC Role / Device Role / Timing Role: NPN complement to BD140 in quasi-complementary output pair; handles positive half-cycle current delivery. Use Value: V_CEO = 80 V provides sufficient rail margin for ±35 V supplies; h_FE ≥ 100 ensures stable bias current setting.	Use Scenario: H-bridge or single-ended driver for 12–24 V brushed DC motors in HVAC actuators and office equipment. IC Role / Device Role / Timing Role: High-side or low-side switching element controlling motor direction/speed via PWM. Use Value: I_C = 1.5 A and P_C = 12.5 W support continuous 500 mA motor current with 2× peak surge tolerance.
Relay and Solenoid Driver	Linear Voltage Regulator Pass Element
Use Scenario: Driving 12 V/24 V electromagnetic relays and solenoids with coil currents up to 1.2 A. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load; includes flyback diode protection. Use Value: V_CEO(sus) = 80 V withstands inductive kickback; V_CE(sat) ≤ 0.5 V minimizes self-heating during hold state.	Use Scenario: Series pass transistor in adjustable linear regulators supplying 1–2 A at 5–15 V output. IC Role / Device Role / Timing Role: Current-controlled variable resistor dissipating excess input-output differential voltage. Use Value: h_FE ≥ 100 simplifies base current calculation; T_J = 150 °C allows operation with modest heatsinking at 1 A/10 V drop.

Audio Power Amplifier Output Stage

DC Motor Driver (Small Brushed)

Use Scenario: Final push-pull stage in Class AB audio amplifiers delivering up to 10 W into 8 Ω loads.

IC Role / Device Role / Timing Role: NPN complement to BD140 in quasi-complementary output pair; handles positive half-cycle current delivery.

Use Value: V_CEO = 80 V provides sufficient rail margin for ±35 V supplies; h_FE ≥ 100 ensures stable bias current setting.

Use Scenario: H-bridge or single-ended driver for 12–24 V brushed DC motors in HVAC actuators and office equipment.

IC Role / Device Role / Timing Role: High-side or low-side switching element controlling motor direction/speed via PWM.

Use Value: I_C = 1.5 A and P_C = 12.5 W support continuous 500 mA motor current with 2× peak surge tolerance.

Relay and Solenoid Driver

Linear Voltage Regulator Pass Element

Use Scenario: Driving 12 V/24 V electromagnetic relays and solenoids with coil currents up to 1.2 A.

IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load; includes flyback diode protection.

Use Value: V_CEO(sus) = 80 V withstands inductive kickback; V_CE(sat) ≤ 0.5 V minimizes self-heating during hold state.

Use Scenario: Series pass transistor in adjustable linear regulators supplying 1–2 A at 5–15 V output.

IC Role / Device Role / Timing Role: Current-controlled variable resistor dissipating excess input-output differential voltage.

Use Value: h_FE ≥ 100 simplifies base current calculation; T_J = 150 °C allows operation with modest heatsinking at 1 A/10 V drop.

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
BD139G	Same V_CEO/I_C/h_FE specs; ON Semiconductor rebranded version with identical TO-126 pinout and thermal profile.	No functional difference; qualified for same linear/switching roles including audio and relay driving.	Select BD139G when sourcing from ON Semi distribution channels; fully interchangeable with BD13910STU in layout and BOM.
MJ15003	Higher P_C = 250 W, larger TO-3 package, V_CEO = 120 V, but h_FE lower (15–30) and no h_FE binning.	Suitable for high-fidelity audio output or RF linear amplifiers where power and voltage headroom outweigh gain consistency.	Choose MJ15003 only when >12.5 W dissipation or >80 V operation is required; not a drop-in replacement due to package and drive differences.

Compared with BD13910STU, BD139G offers identical electrical and mechanical behavior with alternate branding, while MJ15003 trades gain precision and compactness for raw power and voltage capability - making it suitable only for higher-tier audio or industrial linear applications.

Availability

BD13910STU is available at Aetrix Electronics and suitable for audio amplifier output stages, relay/solenoid drivers, and linear regulator pass elements requiring stable component supply, long-term obsolescence management, and traceable legacy semiconductor sourcing.

Supply support for BD13910STU 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 designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; known for robust bipolar transistor families and power management ICs.

The BD13910STU belongs to Fairchild's BD135/137/139 series of medium-power NPN transistors, designed specifically for cost-sensitive, thermally constrained linear and switching applications in consumer, industrial, and automotive auxiliary systems.

FAQ

What is the hFE range for BD13910STU and how is it binned?

The BD13910STU has an h_FE range of 100–250 at V_CE = 2 V and I_C = 150 mA, corresponding to Fairchild's "Class 10" h_FE3 binning. This classification ensures consistent current gain across production units, simplifying base resistor design in both linear and switching circuits using the BD13910STU.

Is BD13910STU pin-compatible with BD139 or BD139G?

Yes - BD13910STU uses the standard TO-126 package with Emitter (Pin 1), Collector (Pin 2), Base (Pin 3) pinout, matching BD139 and BD139G exactly. No PCB layout changes are needed when substituting BD13910STU for either part, provided thermal and electrical conditions remain within spec.

What is the maximum safe continuous collector current for BD13910STU at 70°C case temperature?

At T_C = 70°C, BD13910STU's collector dissipation is derated to approximately 7.5 W (per linear derating curve). With V_CE(sat) ≤ 0.5 V, max continuous I_C ≈ 1.5 A × (7.5 W / 12.5 W) = 0.9 A - assuming saturation operation. For linear operation, further derating applies based on V_CE × I_C product.

Does BD13910STU require a heatsink in typical 1 A switching applications?

Yes - BD13910STU dissipates up to ~0.5 W at I_C = 1 A and V_CE(sat) = 0.5 V. Without heatsinking, junction temperature rise exceeds safe limits even at moderate ambient. A minimum 2.5°C/W heatsink is recommended to maintain T_J < 125°C in enclosed 40°C environments using the BD13910STU.

Can BD13910STU be used as a direct replacement for BD137 or BD135 in existing designs?

No - BD13910STU has higher voltage ratings (V_CEO = 80 V vs. 60 V for BD137 and 45 V for BD135) and higher h_FE min. While electrically safe in lower-voltage circuits, its gain mismatch may affect bias stability in precision linear designs originally tuned for BD135/BD137. Verify operating point margins before substitution using the BD13910STU.

BD13910STU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN

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

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

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 63 @ 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

BD13910STU FAQ

1.How can I place an order for BD13910STU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD13910STU 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 BD13910STU reliable?

The price and inventory of BD13910STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD13910STU is usually 5 days.

3.What payment methods are accepted for BD13910STU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD13910STU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD13910STU?

BD13910STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD13910STU 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 BD13910STU?

For technical support, including BD13910STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD13910STU requirements.

6.How does Aetrix verify that BD13910STU is sourced from the original manufacturer or authorized distributors?

All BD13910STU 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 BD13910STU meets industry standards.

7.What is the process for return or replacement of BD13910STU?

All BD13910STU units undergo pre-shipment inspection (PSI). If there is an issue with BD13910STU, 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 BD13910STU part is unused and in its original packaging.

Return procedure for BD13910STU:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…