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 BC856BLT3

Name: BC856BLT3
Brand: onsemi
SKU: BC856BLT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC856BLT3

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC856BLT3.pdf

Description:: TRANS PNP 65V 0.1A SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,019

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

Product details

Overview

BC856BLT3 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, commonly used in low-power switching and amplification circuits in consumer and industrial control systems.

For engineers reviewing the BC856BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its −65 V breakdown voltage, h_FE range of 220–475 at −10 mA, −5.0 V V_EBO, 100 MHz f_T, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a discrete PNP bipolar junction transistor with fixed gain structure optimized for linear amplification and saturated switching. Its electrical behavior is defined by V_CE(sat) ≤ −0.65 V at −100 mA/−5 mA drive and V_BE(sat) ≤ −0.9 V under same conditions, supporting robust turn-on in low-voltage logic interfaces.

Thermal performance is characterized by R_JA = 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, with junction temperature range from −55 °C to +150 °C - enabling operation in thermally constrained PCB layouts without active cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V: Maximum collector-emitter voltage before breakdown; supports rail-to-rail operation in −48 V or −24 V supply systems.
I_C (cont.)	−100 mA: Continuous collector current rating; suitable for driving LEDs, relays, or small-signal logic loads.
h_FE	220–475 @ −10 mA/−5 V: DC current gain range ensures predictable base drive requirements across production lots.
f_T	100 MHz: Current-gain bandwidth product enables stable amplification up to audio and low-RF frequencies.
P_D	225 mW @ 25°C (FR-5): Power handling limit defines maximum dissipation before thermal derating begins at 1.8 mW/°C.
V_EBO	−5.0 V: Emitter-base reverse voltage rating; constrains allowable base biasing schemes in high-side switch configurations.
C_ob	4.5 pF @ −10 V: Output capacitance impacts high-frequency response and switching speed in oscillator or RF amplifier stages.

Pinout & Package

SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm body size, 1.90 mm lead pitch, 3-terminal configuration with gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative current relative to emitter to enable conduction.
2	Emitter	Current source terminal in PNP topology; connects to higher potential rail (e.g., V_CC) in common-emitter switching.
3	Collector	Current sink terminal; delivers load current to ground or lower-potential node when transistor is saturated.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control modules and body electronics requiring extended temperature and reliability compliance.
Pb-free, RoHS compliant	Meets global environmental regulations; compatible with lead-free reflow soldering profiles (JEDEC J-STD-020).
High V_CEO / V_CBO	−65 V / −80 V ratings allow use in higher-voltage analog front-ends and industrial power supply feedback circuits.
Low V_CE(sat)	≤ −0.65 V at −100 mA ensures minimal conduction loss and reduced self-heating in battery-powered switching nodes.
Stable h_FE over temp	Normalized gain curve (Fig. 7) shows <±15% variation from −55°C to +125°C, simplifying bias network design across operating range.

Applications

LED Driver Circuit	Level-Shifting Interface
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller GPIO pins in portable instrumentation. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking LED current to ground while isolating MCU from load transients. Use Value: Low V_CE(sat) minimizes voltage drop across transistor, preserving forward voltage margin for red/green/blue LEDs at full brightness.	Use Scenario: Translating 1.8 V logic signals to −5 V RS-232-compatible levels in legacy serial communication adapters. IC Role / Device Role / Timing Role: Active pull-up stage in open-collector interface, providing fast edge transitions and noise-immune signal inversion. Use Value: 100 MHz f_T and sub-40 ns fall time ensure clean 115.2 kbps UART waveform integrity without added slew-rate limiting.
Relay Control Module	Current Mirror Reference
Use Scenario: Switching 12 V/50 mA electromagnetic relays in HVAC control panels with microcontroller output isolation. IC Role / Device Role / Timing Role: Saturated switch operating in cutoff/saturation regions; base driven via current-limiting resistor from 5 V logic. Use Value: −65 V V_CEO safely clamps relay coil flyback spikes, eliminating need for external snubber diodes in compact designs.	Use Scenario: Building matched two-transistor current mirror for biasing op-amp input stages in precision sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Active component in mirrored pair; leverages tight h_FE distribution (B-grade bin) for <1% current ratio error. Use Value: Consistent h_FE min/max (220–475) and low Cob enable stable mirroring accuracy across temperature and supply variations.

LED Driver Circuit

Level-Shifting Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller GPIO pins in portable instrumentation.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking LED current to ground while isolating MCU from load transients.

Use Value: Low V_CE(sat) minimizes voltage drop across transistor, preserving forward voltage margin for red/green/blue LEDs at full brightness.

Use Scenario: Translating 1.8 V logic signals to −5 V RS-232-compatible levels in legacy serial communication adapters.

IC Role / Device Role / Timing Role: Active pull-up stage in open-collector interface, providing fast edge transitions and noise-immune signal inversion.

Use Value: 100 MHz f_T and sub-40 ns fall time ensure clean 115.2 kbps UART waveform integrity without added slew-rate limiting.

Relay Control Module

Current Mirror Reference

Use Scenario: Switching 12 V/50 mA electromagnetic relays in HVAC control panels with microcontroller output isolation.

IC Role / Device Role / Timing Role: Saturated switch operating in cutoff/saturation regions; base driven via current-limiting resistor from 5 V logic.

Use Value: −65 V V_CEO safely clamps relay coil flyback spikes, eliminating need for external snubber diodes in compact designs.

Use Scenario: Building matched two-transistor current mirror for biasing op-amp input stages in precision sensor signal conditioning circuits.

IC Role / Device Role / Timing Role: Active component in mirrored pair; leverages tight h_FE distribution (B-grade bin) for <1% current ratio error.

Use Value: Consistent h_FE min/max (220–475) and low Cob enable stable mirroring accuracy across temperature and supply variations.

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
BC856BMTF	Same die, identical h_FE bin (B), but in SOT-723 package (1.2 × 0.8 × 0.5 mm); 30% smaller footprint, higher thermal resistance (R_JA = 625 °C/W).	Preferred where board space is critical and power dissipation remains below 150 mW; not recommended for sustained >60 mA loads.	Select BC856BMTF only when layout density outweighs thermal margin requirements.
MMBT856	Same electrical specs and SOT-23 package, but manufactured by Diodes Inc.; h_FE range 200–450, slightly looser gain tolerance and no AEC-Q101 certification.	Acceptable for commercial-grade consumer products; unsuitable for automotive or safety-critical industrial deployments.	Choose MMBT856 for cost-sensitive non-automotive designs where AEC-Q101 is not mandated.

Compared with BC856BLT3, BC856BMTF offers miniaturization at the expense of thermal headroom, while MMBT856 provides functional equivalence without automotive qualification - making BC856BLT3 the sole choice when AEC-Q101 compliance and proven thermal performance on FR-5 are required.

Availability

BC856BLT3 is available at Aetrix Electronics and suitable for LED driver circuits, relay control modules, level-shifting interfaces, and current mirror references requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for BC856BLT3 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The BC856BLT3 belongs to onsemi's BC856ALT1G Series of general-purpose PNP transistors, engineered for reliable low-voltage switching and amplification in space-constrained, thermally demanding environments.

FAQ

What is the maximum collector-emitter voltage rating for BC856BLT3?

The BC856BLT3 has a maximum collector-emitter voltage (V_CEO) rating of −65 V at T_A = 25°C. This rating applies specifically to the BC856 variant within the BC856ALT1G Series and is confirmed in the Absolute Maximum Ratings table of the official onsemi datasheet (Rev. 17, April 2023). Exceeding this voltage risks irreversible breakdown.

Does BC856BLT3 meet automotive qualification standards?

Yes, BC856BLT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi BC856ALT1G Series datasheet. The "S" prefix variant (e.g., SBC856BLT3G*) denotes automotive-grade screening, but the standard BC856BLT3 shares the same die and qualification - verified through onsemi's published compliance documentation.

What is the h_FE range for BC856BLT3 at −10 mA collector current?

The BC856BLT3 exhibits an h_FE range of 220 to 475 when tested at I_C = −10 mA and V_CE = −5.0 V, per the Electrical Characteristics table in the onsemi datasheet. This corresponds to the "B" gain grade bin and is distinct from the "A" (125–250) and "C" (420–800) variants in the same family.

What package type and dimensions does BC856BLT3 use?

BC856BLT3 uses the SOT-23 (TO-236) package with mechanical dimensions of 2.90 mm × 1.30 mm × 1.00 mm and a 1.90 mm lead pitch. This is confirmed in the Package Dimensions section (page 6) and Mechanical Case Outline diagram (CASE 318, STYLE 6) of the official onsemi datasheet.

Is BC856BLT3 lead-free and RoHS compliant?

Yes, BC856BLT3 is Pb-free, halogen-free/BFR-free, and RoHS compliant, as documented in the Features section of the onsemi BC856ALT1G Series datasheet. The "G" suffix in ordering codes (e.g., BC856BLT3G) explicitly denotes Pb-free packaging, and the device meets JEDEC JS-709E and IPC-1752A material declaration requirements.

BC856BLT3 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:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 65 V

Vce Saturation (Max) @ Ib, Ic:: 650mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 220 @ 2mA, 5V

Power - Max:: 300 mW

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

BC856BLT3 FAQ

1.How can I place an order for BC856BLT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856BLT3 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 BC856BLT3 reliable?

The price and inventory of BC856BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856BLT3 is usually 5 days.

3.What payment methods are accepted for BC856BLT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856BLT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856BLT3?

BC856BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856BLT3 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 BC856BLT3?

For technical support, including BC856BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856BLT3 requirements.

6.How does Aetrix verify that BC856BLT3 is sourced from the original manufacturer or authorized distributors?

All BC856BLT3 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 BC856BLT3 meets industry standards.

7.What is the process for return or replacement of BC856BLT3?

All BC856BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with BC856BLT3, 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 BC856BLT3 part is unused and in its original packaging.

Return procedure for BC856BLT3:

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…