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

onsemi BC63916_J35Z

Name: BC63916_J35Z
Brand: onsemi
SKU: BC63916_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC63916_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BC63916_J35Z.pdf

Description:: TRANS NPN 80V 1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC63916_J35Z from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for switching and amplifier applications, with V_CEO = 80 V, I_C = 1 A, P_C = 1 W, h_FE ≥ 40 at I_C = 150 mA, and f_T = 100 MHz - used in relay drivers, power supplies, and audio preamplifier stages.

For engineers reviewing the BC63916_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include collector-emitter breakdown voltage, DC current gain at medium current, saturation voltage under 500 mA drive, thermal limits up to 150°C junction temperature, and TO-92 mechanical compatibility.

Technical Context

This device operates as a general-purpose NPN bipolar junction transistor with fixed emitter-base and collector-emitter voltage ratings defined per variant group. Its h_FE is specified across three test conditions (5 mA, 150 mA, 500 mA), supporting both linear amplification and saturated switching roles.

The BC63916_J35Z belongs to the BC635/637/639 family where BC639 denotes the 80 V V_CEO grade; it shares identical TO-92 package, pinout (E-C-B), and thermal characteristics with BC635 and BC637 but differs in absolute maximum V_CEO, V_CER, and V_CES.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum safe collector-emitter voltage before avalanche breakdown under open-base condition
I_C	1 A - continuous DC collector current rating at T_A = 25°C, derated above 25°C
P_C	1 W - total power dissipation limit at case temperature ≤ 25°C, requires heatsinking above ambient
h_FE (I_C = 150 mA)	≥ 40 - minimum DC current gain enabling reliable base drive design for 150 mA load switching
V_CE(sat)	0.5 V @ I_C = 500 mA, I_B = 50 mA - low saturation voltage ensures < 250 mW conduction loss in switch mode
f_T	100 MHz - usable bandwidth for RF amplification up to ~10–20 MHz with gain margin

Pinout & Package

BC63916_J35Z is housed in a standard TO-92 plastic package with 3 leads: Emitter (Pin 1), Collector (Pin 2), Base (Pin 3), viewed from flat side with leads down.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-side return path in common-emitter configuration
2 (Collector)	Current source terminal	Connects to load or supply rail; carries full switched/amplified output current
3 (Base)	Control input terminal	Receives current-limited drive signal to modulate collector current; requires series resistor for I_B limiting

Key Features

Feature	Design Value
High V_CEO rating	80 V enables use in 24–48 V industrial control and power supply secondary-side switching
Medium-current h_FE stability	h_FE ≥ 40 at I_C = 150 mA supports predictable base drive without overdesign
Low V_CE(sat)	0.5 V at 500 mA reduces conduction loss and self-heating in repetitive switching
150°C junction rating	Supports operation in enclosed or high-ambient environments without forced cooling

Applications

Relay Driver Circuit	DC-DC Converter Switch
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: NPN switch operating in saturation to fully energize relay with minimal voltage drop. Use Value: V_CE(sat) ≤ 0.5 V ensures >11.5 V across coil for reliable pull-in; h_FE ≥ 40 allows 12 mA base drive from 3.3 V MCU.	Use Scenario: Low-side switch in 24 V input, 5 V output buck converter operating at 100 kHz. IC Role / Device Role / Timing Role: Power switch controlling energy transfer into inductor during on-time. Use Value: 80 V V_CEO provides 3× safety margin over 24 V input; 1 A I_C supports up to 500 mA output with margin.
Audio Preamp Stage	LED Array Current Sink
Use Scenario: First-stage small-signal amplifier in battery-powered portable audio mixer. IC Role / Device Role / Timing Role: Common-emitter voltage amplifier with resistive collector load. Use Value: f_T = 100 MHz ensures flat gain response up to 20 kHz; h_FE ≥ 25 at 5 mA supports low-noise biasing.	Use Scenario: Constant-current sink for 8 × white LEDs (3.2 V each) in signage backlight. IC Role / Device Role / Timing Role: Linear current regulator with emitter resistor feedback. Use Value: 1 W P_C and 150°C T_J allow 350 mA continuous sink with 2.5 V drop across emitter resistor.

Relay Driver Circuit

DC-DC Converter Switch

Use Scenario: Driving 12 V/500 mA electromagnetic relay coil from microcontroller GPIO.

IC Role / Device Role / Timing Role: NPN switch operating in saturation to fully energize relay with minimal voltage drop.

Use Value: V_CE(sat) ≤ 0.5 V ensures >11.5 V across coil for reliable pull-in; h_FE ≥ 40 allows 12 mA base drive from 3.3 V MCU.

Use Scenario: Low-side switch in 24 V input, 5 V output buck converter operating at 100 kHz.

IC Role / Device Role / Timing Role: Power switch controlling energy transfer into inductor during on-time.

Use Value: 80 V V_CEO provides 3× safety margin over 24 V input; 1 A I_C supports up to 500 mA output with margin.

Audio Preamp Stage

LED Array Current Sink

Use Scenario: First-stage small-signal amplifier in battery-powered portable audio mixer.

IC Role / Device Role / Timing Role: Common-emitter voltage amplifier with resistive collector load.

Use Value: f_T = 100 MHz ensures flat gain response up to 20 kHz; h_FE ≥ 25 at 5 mA supports low-noise biasing.

Use Scenario: Constant-current sink for 8 × white LEDs (3.2 V each) in signage backlight.

IC Role / Device Role / Timing Role: Linear current regulator with emitter resistor feedback.

Use Value: 1 W P_C and 150°C T_J allow 350 mA continuous sink with 2.5 V drop across emitter resistor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC639	Identical electrical specs and TO-92 package; BC63916_J35Z is a variant marking of BC639 per Fairchild documentation	No functional difference; same pinout, ratings, and thermal behavior	Select BC639 when standard part numbering is required for BOM alignment
MPSA42	Higher V_CEO = 300 V, lower h_FE = 25–100, same TO-92 package and pinout	Better suited for high-voltage flyback snubbers or AC line sensing; less gain margin at medium current	Choose MPSA42 only if >100 V breakdown is mandatory; otherwise BC63916_J35Z offers superior h_FE at 150 mA

Compared with BC639 and MPSA42, BC63916_J35Z delivers optimal balance of 80 V breakdown, 40+ h_FE at 150 mA, and 0.5 V saturation - making it preferred for industrial relay drivers and mid-power DC-DC switches where gain predictability and conduction loss matter most.

Availability

BC63916_J35Z is available at Aetrix Electronics and suitable for relay driver circuits, DC-DC converter switches, and LED current sink designs requiring stable component supply, long-term manufacturability, and consistent parametric performance.

Supply support for BC63916_J35Z 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 devices before its acquisition by ON Semiconductor in 2016.

The BC63916_J35Z belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered for cost-sensitive industrial, consumer, and power conversion applications requiring proven reliability and wide operating margins.

FAQ

What is the maximum collector-emitter voltage rating for BC63916_J35Z?

The BC63916_J35Z has a V_CEO rating of 80 V, meaning it can safely withstand up to 80 volts between collector and emitter with the base open. This value is confirmed in the Fairchild BC635/637/639 datasheet Rev. B2 under Electrical Characteristics, and applies specifically to the BC639 grade within the family - which BC63916_J35Z implements.

Is BC63916_J35Z pin-compatible with BC639?

Yes, BC63916_J35Z is pin-compatible with BC639: both use TO-92 packaging with identical lead assignment (Emitter-Pin1, Collector-Pin2, Base-Pin3) and share identical absolute maximum ratings and electrical characteristics. The "J35Z" suffix reflects Fairchild's internal date/batch coding, not a functional deviation from BC639.

What is the DC current gain (hFE) of BC63916_J35Z at 150 mA collector current?

At V_CE = 2 V and I_C = 150 mA, the BC63916_J35Z guarantees h_FE ≥ 40 (minimum), with typical values reaching 160. This specification is explicitly listed in the "Electrical Characteristics" table of the Fairchild BC635/637/639 datasheet and defines its suitability for medium-current switching applications.

Can BC63916_J35Z be used in linear amplifier configurations?

Yes, BC63916_J35Z supports linear operation: its f_T = 100 MHz and h_FE stability across 5–500 mA make it viable for audio preamplifier and signal conditioning stages. However, linear use requires careful thermal design due to its 1 W power limit and must avoid exceeding 150°C junction temperature - verified via derating curves in the BC635/637/639 datasheet.

What is the collector-emitter saturation voltage (VCE(sat)) for BC63916_J35Z under typical switching conditions?

The BC63916_J35Z exhibits V_CE(sat) ≤ 0.5 V when operated at I_C = 500 mA and I_B = 50 mA, as specified in the Fairchild BC635/637/639 datasheet. This low saturation voltage minimizes power loss during switching and confirms its effectiveness in saturated-switch applications like relay drivers and LED sinks.

BC63916_J35Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 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:: 100 @ 150mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC63916_J35Z FAQ

1.How can I place an order for BC63916_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC63916_J35Z 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 BC63916_J35Z reliable?

The price and inventory of BC63916_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC63916_J35Z is usually 5 days.

3.What payment methods are accepted for BC63916_J35Z?

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4.How is shipping managed for BC63916_J35Z?

BC63916_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC63916_J35Z 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 BC63916_J35Z?

For technical support, including BC63916_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC63916_J35Z requirements.

6.How does Aetrix verify that BC63916_J35Z is sourced from the original manufacturer or authorized distributors?

All BC63916_J35Z 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 BC63916_J35Z meets industry standards.

7.What is the process for return or replacement of BC63916_J35Z?

All BC63916_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC63916_J35Z, 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 BC63916_J35Z part is unused and in its original packaging.

Return procedure for BC63916_J35Z:

1.Submit a request within 90 days.

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

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