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

onsemi BSR14_D87Z

Name: BSR14_D87Z
Brand: onsemi
SKU: BSR14_D87Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSR14_D87Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BSR14_D87Z.pdf

Description:: TRANS NPN 40V 0.8A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSR14_D87Z from ON Semiconductor is an NPN general-purpose amplifier transistor designed for medium-power amplification and switching applications with continuous collector current up to 800 mA, V_CEO = 40 V, and f_T = 300 MHz. It operates across –55°C to +150°C and is commonly used in low-voltage DC-DC converter control stages and signal buffering circuits.

For engineers reviewing the BSR14_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package, h_FE range (35–300), V_CE(sat) ≤ 1.0 V at I_C = 500 mA, thermal resistance of 357°C/W, and suitability for discrete switching in power management subsystems.

Technical Context

The BSR14_D87Z is a silicon NPN bipolar junction transistor fabricated using Fairchild's Process 19, optimized for stable DC gain and high-frequency response. Its f_T of 300 MHz supports RF preamplifier and broadband switching roles, while its low V_CE(sat) and defined storage time (t_s = 225 ns) enable efficient on/off control in pulse-driven loads.

It features a maximum V_CBO of 75 V and V_EBO of 6.0 V, supporting biasing flexibility in common-emitter configurations. The device's h_ie (2.0–8.0 kΩ) and h_fe (50–300) are specified at 1.0 mA and 10 V, aligning with small-signal amplification requirements in sensor interface and driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage under open-base conditions; defines upper rail limit in switch designs.
I_C (continuous)	800 mA - Continuous collector current handling capacity; supports medium-power load switching without forced cooling.
f_T	300 MHz - Current gain–bandwidth product; enables use in VHF amplifiers and fast-switching gate drivers.
V_CE(sat)	≤1.0 V @ I_C=500 mA, I_B=50 mA - Low saturation voltage reduces conduction loss in saturated-switch applications.
h_FE	40–300 - DC current gain range across operating currents; allows predictable base drive sizing from 0.1 mA to 500 mA.
R_θJA	357°C/W - Junction-to-ambient thermal resistance on FR-4 PCB (40×40×1.5 mm); informs derating need above 25°C ambient.
P_D	350 mW @ 25°C - Total power dissipation limit; requires thermal design consideration at >100 mA continuous operation.

Pinout & Package

SOT-23 plastic surface-mount package with marking "U8"; standard three-terminal configuration for compact board layout and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for base-emitter bias; connects to ground or low-side return path in common-emitter switches.
2 (Base)	Control input	Receives forward-biased current to turn on transistor; requires series resistor to limit I_B per h_FE and load demand.
3 (Collector)	Current source terminal	Connects to load and supply rail; carries full switched current; must be routed with adequate copper area for thermal relief.

Key Features

Feature	Design Value
Medium-power switching capability	Rated for 800 mA continuous collector current and 350 mW dissipation - supports discrete load control without heatsinking in space-constrained designs.
High f_T bandwidth	300 MHz transition frequency - enables use in RF front-end buffers and fast digital signal conditioning where gain stability matters.
Low V_CE(sat)	0.3 V typical at 150 mA - minimizes voltage drop and power loss in saturated logic-level switching applications.
Wide temperature operation	–55°C to +150°C junction range - suitable for automotive under-hood and industrial motor-control environments.

Applications

DC-DC Converter Driver	LED Constant-Current Switch
Use Scenario: Driving the base of a power MOSFET or IGBT in non-synchronous buck converter topologies. IC Role / Device Role / Timing Role: Discrete NPN switch providing level-shifted, current-amplified gate drive pulses. Use Value: Fast switching (t_r = 25 ns, t_f = 60 ns) and low V_CE(sat) reduce drive losses and improve converter efficiency at 100–500 kHz.	Use Scenario: Controlling high-brightness LED strings in automotive lighting modules with PWM dimming. IC Role / Device Role / Timing Role: Low-side current switch regulating LED current via base-controlled saturation. Use Value: h_FE ≥ 100 at 10 mA ensures stable current regulation with minimal base drive overhead and thermal drift.
Sensor Signal Amplifier	Industrial Relay Driver
Use Scenario: Amplifying low-level analog outputs from temperature or current-sense resistors before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network. Use Value: h_fe = 50–300 and h_ie = 2–8 kΩ support predictable gain setting and impedance matching into 10 kΩ ADC inputs.	Use Scenario: Activating 12 V/24 V electromagnetic relays in PLC I/O modules. IC Role / Device Role / Timing Role: General-purpose switching transistor interfacing microcontroller GPIO to relay coil. Use Value: V_CBO = 75 V provides margin against inductive kickback; t_s = 225 ns allows reliable deactivation timing in 10 Hz–1 kHz cycling.

DC-DC Converter Driver

LED Constant-Current Switch

Use Scenario: Driving the base of a power MOSFET or IGBT in non-synchronous buck converter topologies.

IC Role / Device Role / Timing Role: Discrete NPN switch providing level-shifted, current-amplified gate drive pulses.

Use Value: Fast switching (t_r = 25 ns, t_f = 60 ns) and low V_CE(sat) reduce drive losses and improve converter efficiency at 100–500 kHz.

Use Scenario: Controlling high-brightness LED strings in automotive lighting modules with PWM dimming.

IC Role / Device Role / Timing Role: Low-side current switch regulating LED current via base-controlled saturation.

Use Value: h_FE ≥ 100 at 10 mA ensures stable current regulation with minimal base drive overhead and thermal drift.

Sensor Signal Amplifier

Industrial Relay Driver

Use Scenario: Amplifying low-level analog outputs from temperature or current-sense resistors before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network.

Use Value: h_fe = 50–300 and h_ie = 2–8 kΩ support predictable gain setting and impedance matching into 10 kΩ ADC inputs.

Use Scenario: Activating 12 V/24 V electromagnetic relays in PLC I/O modules.

IC Role / Device Role / Timing Role: General-purpose switching transistor interfacing microcontroller GPIO to relay coil.

Use Value: V_CBO = 75 V provides margin against inductive kickback; t_s = 225 ns allows reliable deactivation timing in 10 Hz–1 kHz cycling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN amplifier/switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCW65C	Same die family per datasheet reference; identical h_FE, V_CEO, and f_T; SOT-23 package with same pinout.	No functional difference; BCW65C is explicitly cited in BSR14 datasheet as having matching characteristics.	Select BCW65C when direct cross-reference validation is required per legacy design documentation.
MMBT3904LT1G	Lower I_C rating (200 mA vs. 800 mA); higher h_FE min (100 vs. 35); same SOT-23 package and pinout.	Not suitable for >200 mA loads; preferred in low-current signal amplification where gain consistency is critical.	Choose MMBT3904LT1G only for sub-200 mA linear or switching roles where tighter h_FE distribution matters.

Compared with BCW65C and MMBT3904LT1G, the BSR14_D87Z offers superior current-handling headroom and thermal robustness for medium-power discrete switching, while maintaining compatibility with standard SOT-23 footprint layouts and base-drive design practices.

Availability

BSR14_D87Z is available at Aetrix Electronics and suitable for DC-DC converter drivers, LED constant-current switches, sensor signal amplifiers, and industrial relay drivers requiring stable component supply and long-term production continuity.

Supply support for BSR14_D87Z 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power and signal management solutions, with roots in Fairchild Semiconductor's discrete and analog portfolio.

The BSR14_D87Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability discrete amplification and switching in automotive, industrial, and consumer power systems.

FAQ

What is the maximum collector current rating for the BSR14_D87Z?

The BSR14_D87Z has a maximum continuous collector current (I_C) rating of 800 mA at T_A = 25°C. Derating applies above 25°C ambient per its thermal resistance of 357°C/W. This rating supports medium-power switching tasks such as relay driving and LED current control without external heatsinking in typical PCB layouts.

Does the BSR14_D87Z have a documented pinout compatible with standard SOT-23 footprints?

Yes, the BSR14_D87Z uses the standard SOT-23 package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector - matching JEDEC MO-178AB. The marking "U8" on the top surface confirms this orientation. This pinout is consistent across BCW65C and other functionally aligned NPN transistors in the same package.

What is the typical f_T value for the BSR14_D87Z and how does it affect circuit design?

The BSR14_D87Z has a minimum f_T of 300 MHz at I_C = 20 mA and V_CE = 20 V. This high transition frequency supports stable gain in VHF amplifiers and fast-switching applications like gate driving, but requires careful layout to avoid parasitic oscillation due to stray capacitance and inductance.

Can the BSR14_D87Z replace the BCW65C in existing designs?

Yes, the BSR14_D87Z can replace the BCW65C in most applications because the BSR14 datasheet explicitly references BCW65C for identical electrical characteristics, including h_FE, V_CEO, and f_T. Both share the SOT-23 package and pinout, making them functionally interchangeable without layout changes.

What is the V_CE(sat) performance of the BSR14_D87Z under high-current switching conditions?

The BSR14_D87Z achieves V_CE(sat) ≤ 1.0 V at I_C = 500 mA and I_B = 50 mA, and as low as 0.3 V at I_C = 150 mA and I_B = 15 mA. This low saturation voltage directly reduces conduction loss in switching applications, improving thermal efficiency in DC-DC converter drivers and relay interfaces where the BSR14_D87Z is commonly deployed.

BSR14_D87Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 800 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 500mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 350 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BSR14_D87Z FAQ

1.How can I place an order for BSR14_D87Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BSR14_D87Z 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 BSR14_D87Z reliable?

The price and inventory of BSR14_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR14_D87Z is usually 5 days.

3.What payment methods are accepted for BSR14_D87Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR14_D87Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSR14_D87Z?

BSR14_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSR14_D87Z 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 BSR14_D87Z?

For technical support, including BSR14_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR14_D87Z requirements.

6.How does Aetrix verify that BSR14_D87Z is sourced from the original manufacturer or authorized distributors?

All BSR14_D87Z 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 BSR14_D87Z meets industry standards.

7.What is the process for return or replacement of BSR14_D87Z?

All BSR14_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with BSR14_D87Z, 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 BSR14_D87Z part is unused and in its original packaging.

Return procedure for BSR14_D87Z:

1.Submit a request within 90 days.

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

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