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

onsemi BC856BLT1

Name: BC856BLT1
Brand: onsemi
SKU: BC856BLT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC856BLT1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: BC856BLT1.pdf

Description:: TRANS PNP 65V 100MA SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC856BLT1 from onsemi is a PNP silicon general-purpose transistor in SOT-23 package, rated for −65 V V_CEO, −100 mA I_C, and 225 mW power dissipation on FR-5 board; it delivers h_FE = 220–475 (at I_C = −10 mA, V_CE = −5 V), V_CE(sat) ≤ −0.65 V (at I_C = −100 mA, I_B = −5 mA), and f_T = 100 MHz - used in low-voltage biasing, signal switching, and level-shifting circuits in industrial control modules.

For engineers reviewing the BC856BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, SOT-23 footprint compatibility, guaranteed AEC-Q101 qualification for automotive-grade reliability, and verified performance across −55°C to +150°C junction temperature range.

Technical Context

This device operates as a discrete bipolar junction transistor with fixed PNP polarity, requiring external base current control to switch or amplify analog/digital signals. Its DC current gain (h_FE) is binned per variant: BC856B specifies 220–475 at −10 mA collector current, and saturation voltage remains ≤ −0.65 V under high-current switching conditions (−100 mA).

Thermal design relies on R_JA = 556°C/W (FR-5) or 417°C/W (alumina), with derating of 1.8 mW/°C above 25°C on standard PCBs. The device supports fast switching with t_d = 35 ns, t_r = 25 ns, t_s = 310 ns, and t_f = 40 ns under −3 V supply and −10 mA load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V - Maximum safe collector-emitter voltage before breakdown; enables use in −48 V telecom bias rails and industrial −24 V logic interfaces.
I_C (continuous)	−100 mA - Continuous collector current rating; supports driving small relays, LEDs, or MOSFET gates without heatsinking.
h_FE	220–475 @ −10 mA, −5 V - Guaranteed DC current gain range for BC856B variant; ensures predictable base drive sizing in linear amplification or saturated switching.
V_CE(sat)	≤ −0.65 V @ −100 mA, −5 mA - Low saturation voltage minimizes power loss and heating during high-current ON-state operation.
f_T	100 MHz - Transition frequency confirms usable bandwidth up to ~10 MHz for small-signal amplification or RF detector stages.
P_D (FR-5)	225 mW - Power dissipation limit on standard epoxy PCB; requires thermal relief or copper pour for sustained >150 mW operation.
T_J/T_stg	−55°C to +150°C - Full automotive-grade junction/storage temperature range; validated for under-hood and industrial ambient environments.

Pinout & Package

SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm body size, 1.90 mm lead pitch; marked "3B" on top surface; Pb-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; forward-biased with negative voltage relative to emitter to turn ON the PNP transistor.
2	Emiter	Current source terminal; connected to higher potential (e.g., V_CC) in common-emitter configurations.
3	Collector	Current sink terminal; delivers load current to ground or lower-potential node when transistor is ON.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control, body electronics, and ADAS sensors - no additional qualification testing required.
h_FE binning (B grade)	Narrower DC gain spread (220–475) improves consistency in production-critical bias networks and analog front-ends.
Low V_CE(sat)	≤ −0.65 V at −100 mA enables efficient switching in battery-powered systems where voltage headroom is constrained.
High V_CEO	−65 V rating allows safe operation in legacy −48 V telecom infrastructure and industrial −24/−36 V power domains.
RoHS/Pb-free	Complies with global environmental regulations; compatible with lead-free reflow soldering profiles (JEDEC J-STD-020).

Applications

Industrial Sensor Interface	Automotive Body Control Module
Use Scenario: Level-shifting digital signals from 3.3 V microcontrollers to −12 V CAN transceiver bias rails. IC Role / Device Role / Timing Role: PNP switch providing active-low output stage with rail-to-rail voltage translation. Use Value: Eliminates need for dedicated level-shifter ICs; leverages BC856BLT1's −65 V V_CEO and fast 25 ns rise time for clean edge integrity.	Use Scenario: Driving LED indicators and small solenoids in door lock actuators and mirror position controls. IC Role / Device Role / Timing Role: Saturated-switching PNP transistor sourcing current from 12 V battery to grounded loads. Use Value: Uses BC856BLT1's −100 mA I_C rating and AEC-Q101 qualification to ensure long-term reliability in vibration-prone vehicle environments.
Power Supply Sequencing	Legacy Telecom Bias Circuit
Use Scenario: Enabling/disabling auxiliary voltage rails in multi-rail FPGA power supplies using microcontroller GPIO. IC Role / Device Role / Timing Role: Low-side enable switch controlling base current of high-current pass transistors. Use Value: Relies on BC856BLT1's consistent h_FE (220–475) to guarantee precise turn-on timing and avoid rail collapse during sequencing.	Use Scenario: Providing −48 V bias current to line-card interface ICs in central office equipment. IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor and base voltage divider. Use Value: Leverages BC856BLT1's −65 V V_CEO and −55°C to +150°C T_J range to operate safely in uncooled telecom cabinets with wide ambient swings.

Industrial Sensor Interface

Automotive Body Control Module

Use Scenario: Level-shifting digital signals from 3.3 V microcontrollers to −12 V CAN transceiver bias rails.

IC Role / Device Role / Timing Role: PNP switch providing active-low output stage with rail-to-rail voltage translation.

Use Value: Eliminates need for dedicated level-shifter ICs; leverages BC856BLT1's −65 V V_CEO and fast 25 ns rise time for clean edge integrity.

Use Scenario: Driving LED indicators and small solenoids in door lock actuators and mirror position controls.

IC Role / Device Role / Timing Role: Saturated-switching PNP transistor sourcing current from 12 V battery to grounded loads.

Use Value: Uses BC856BLT1's −100 mA I_C rating and AEC-Q101 qualification to ensure long-term reliability in vibration-prone vehicle environments.

Power Supply Sequencing

Legacy Telecom Bias Circuit

Use Scenario: Enabling/disabling auxiliary voltage rails in multi-rail FPGA power supplies using microcontroller GPIO.

IC Role / Device Role / Timing Role: Low-side enable switch controlling base current of high-current pass transistors.

Use Value: Relies on BC856BLT1's consistent h_FE (220–475) to guarantee precise turn-on timing and avoid rail collapse during sequencing.

Use Scenario: Providing −48 V bias current to line-card interface ICs in central office equipment.

IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor and base voltage divider.

Use Value: Leverages BC856BLT1's −65 V V_CEO and −55°C to +150°C T_J range to operate safely in uncooled telecom cabinets with wide ambient swings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC856ALT1G	Lower h_FE range (125–250); same V_CEO, V_CE(sat), and package.	Preferred where tighter gain tolerance is unnecessary and cost sensitivity is higher.	Select BC856ALT1G when circuit gain margin exceeds 2× and automotive qualification is not required.
MMBT3906LT1G	Same SOT-23 package; h_FE = 100–300 (at −10 mA); V_CEO = −40 V; non-AEC-Q101.	Common in consumer electronics; insufficient for −48 V or automotive under-hood use.	Choose MMBT3906LT1G only for non-automotive, ≤−40 V applications where AEC-Q101 is not mandated.

Compared with BC856ALT1G and MMBT3906LT1G, BC856BLT1 offers superior h_FE consistency and −65 V robustness - critical for industrial power sequencing and automotive body electronics where voltage margin and gain predictability directly impact functional safety compliance.

Availability

BC856BLT1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, power supply sequencing, and legacy telecom bias circuits requiring stable component supply, long-lifecycle support, and AEC-Q101 traceability.

Supply support for BC856BLT1 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 is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BC856BLT1 belongs to onsemi's BC856ALT1G Series of general-purpose PNP transistors, designed specifically for high-reliability signal switching, biasing, and amplification in space-constrained, thermally demanding applications.

FAQ

What is the maximum collector-emitter voltage rating for BC856BLT1?

The BC856BLT1 has a maximum collector-emitter voltage (V_CEO) rating of −65 V at T_A = 25°C. This rating is confirmed in the Absolute Maximum Ratings table of the official onsemi datasheet (Rev. 17, April 2023) and applies to the BC856 series including BC856BLT1. Exceeding this voltage risks irreversible breakdown.

Is BC856BLT1 qualified for automotive applications?

Yes, BC856BLT1 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi BC856ALT1G Series datasheet. This qualification covers the full BC856BLT1 variant, enabling its use in automotive body electronics, lighting, and ADAS subsystems without additional stress testing.

What is the DC current gain (h_FE) range for BC856BLT1?

The BC856BLT1 is the "B" grade variant, with h_FE specified as 220–475 at I_C = −10 mA and V_CE = −5.0 V, per the Electrical Characteristics table in the onsemi datasheet. This binning ensures tighter gain distribution than the "A" grade (125–250) for improved circuit predictability.

What package type does BC856BLT1 use?

BC856BLT1 uses the SOT-23 (TO-236) surface-mount package, as confirmed in the Ordering Information table and Mechanical Case Outline section of the onsemi datasheet. Dimensions are 2.90 × 1.30 × 1.00 mm with 1.90 mm lead pitch; marking code is "3B".

Does BC856BLT1 have Pb-free and RoHS compliance?

Yes, BC856BLT1 is Pb-free, halogen-free/BFR-free, and RoHS compliant, as stated in the Features section of the onsemi datasheet. The "G" suffix in alternate part numbers (e.g., BC856BLT1G) explicitly denotes Pb-free packaging, and the device meets JEDEC J-STD-020 reflow standards.

BC856BLT1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

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

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

BC856BLT1 FAQ

1.How can I place an order for BC856BLT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856BLT1 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 BC856BLT1 reliable?

The price and inventory of BC856BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856BLT1 is usually 5 days.

3.What payment methods are accepted for BC856BLT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856BLT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856BLT1?

BC856BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856BLT1 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 BC856BLT1?

For technical support, including BC856BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856BLT1 requirements.

6.How does Aetrix verify that BC856BLT1 is sourced from the original manufacturer or authorized distributors?

All BC856BLT1 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 BC856BLT1 meets industry standards.

7.What is the process for return or replacement of BC856BLT1?

All BC856BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC856BLT1, 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 BC856BLT1 part is unused and in its original packaging.

Return procedure for BC856BLT1:

1.Submit a request within 90 days.

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

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