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

Nexperia USA Inc. BC856B-QR

Name: BC856B-QR
Brand: Nexperia USA Inc.
SKU: BC856B-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC856B-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC856B-QR.pdf

Description:: TRANS PNP 65V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:4,050

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Product details

Overview

BC856B-QR from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT23 (TO-236AB) package, rated for −65 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 220–475 at V_CE = −5 V and I_C = −2 mA. It serves as a low-voltage switching or linear amplification device in automotive signal conditioning, power management enable circuits, and sensor interface stages.

For engineers reviewing the BC856B-QR datasheet, BC856B-QR pinout, BC856B-QR application, or BC856B-QR equivalent, key selection criteria include its AEC-Q101 qualification, guaranteed h_FE range, −65 V collector-emitter breakdown voltage, SOT23 footprint compatibility, and thermal resistance of 500 K/W on FR4 PCB.

Technical Context

This PNP BJT operates with base-emitter forward bias to control collector current flow in common-emitter or common-base configurations. Its design supports stable DC amplification and fast switching up to 100 MHz f_T, with V_BE(sat) ≤ −850 mV at I_C = −100 mA and I_B = −5 mA.

Thermal performance is defined for standard FR4 PCB mounting (single-sided, 35 µm Cu), delivering R_th(j-a) = 500 K/W. Absolute maximum ratings include −80 V V_CBO, −5 V V_EBO, and 150 °C T_j, ensuring robustness in automotive ambient conditions (−65 °C to 150 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V - Maximum safe collector-emitter voltage with open base; enables use in 48 V automotive supply rails with margin.
I_C	−100 mA - Continuous collector current rating; suitable for driving LEDs, small relays, or logic-level translators.
h_FE	220–475 - Guaranteed DC current gain at V_CE = −5 V, I_C = −2 mA; ensures predictable base drive requirements.
V_CE(sat)	−250 to −650 mV - Low saturation voltage at I_C = −100 mA, I_B = −5 mA; minimizes conduction loss in switch mode.
f_T	100 MHz - Transition frequency at V_CE = −5 V, I_C = −10 mA; supports high-speed digital switching and RF bias applications.
R_th(j-a)	500 K/W - Junction-to-ambient thermal resistance on standard FR4; defines power derating above 25 °C ambient.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact 2.9 mm × 1.3 mm footprint, 1.1 mm height, and gull-wing terminations for reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; forward-biased to turn on PNP conduction; requires current sink for activation.
2	Emitter (E)	Current source terminal; connected to higher potential rail in typical switch configuration.
3	Collector (C)	Current sink terminal; delivers load current to ground or lower-potential node when active.

Key Features

Feature	Design Value
AEC-Q101 qualified	Stress-tested per Automotive Electronics Council standard; validated for under-hood temperature cycling and humidity exposure.
Low V_CE(sat)	≤ −650 mV at I_C = −100 mA ensures <130 mW conduction loss in saturated switch operation.
High h_FE consistency	220–475 range reduces base drive circuit variability across production lots.
Small SOT23 footprint	Enables high-density PCB layouts in space-constrained modules like body control units and sensor nodes.

Applications

Automotive Door Module Switching

Industrial Sensor Signal Conditioning

Use Scenario: Controlling window lift motor enable signals in door control units.

IC Role / Device Role / Timing Role: PNP switch enabling 12 V supply path to motor driver IC upon microcontroller GPIO assertion.

Use Value: −65 V V_CEO withstands load-dump transients; AEC-Q101 compliance ensures reliability over 15-year vehicle life.

Use Scenario: Level-shifting and buffering analog output from NTC temperature sensors.

IC Role / Device Role / Timing Role: Emitter-follower amplifier providing low-impedance output while isolating sensor from downstream ADC input.

Use Value: Stable h_FE across −40 °C to 125 °C maintains gain accuracy; low noise figure (2–10 dB) preserves signal integrity.

Consumer Power Management Enable

Medical Diagnostic Equipment Bias Control

Use Scenario: Enabling auxiliary 3.3 V LDO regulators in portable ultrasound devices.

IC Role / Device Role / Timing Role: High-side switch controlled by system PMIC to sequence power-up of subsystems.

Use Value: −250 mV V_CE(sat) minimizes dropout voltage; SOT23 size allows placement near regulator input pins.

Use Scenario: Biasing photodiode transimpedance amplifier stages in blood oximetry modules.

IC Role / Device Role / Timing Role: Constant-current source setting op-amp bias point in precision analog front-end.

Use Value: Tight h_FE tolerance (220–475) ensures repeatable current mirror ratios; low C_c (4.5 pF) avoids phase shift in feedback loop.

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
BC857B-Q	V_CEO = −45 V (vs. −65 V); identical h_FE range and SOT23 package.	Not suitable for 48 V systems or load-dump tolerant designs requiring >−45 V rating.	Select when operating voltage ≤36 V and cost optimization is prioritized.
MMBT3906LT1G	h_FE = 100–300 (lower min); V_CEO = −40 V; same SOT23 footprint but not AEC-Q101 qualified.	Lacks automotive qualification; limited thermal margin (R_th(j-a) ≈ 625 K/W vs. 500 K/W).	Acceptable for commercial-grade consumer products where qualification and thermal headroom are non-critical.

Compared with BC856B-QR, BC857B-Q trades 20 V V_CEO margin for identical gain and footprint, while MMBT3906LT1G sacrifices automotive qualification, gain consistency, and thermal performance for broader distributor availability.

Availability

BC856B-QR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BC856B-QR 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and efficient manufacturing.

The BC856B-QR belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust switching and amplification in harsh automotive and industrial environments.

FAQ

Is BC856B-QR pin-compatible with BC846B-Q?

Yes - BC856B-QR (PNP) and BC846B-Q (NPN) share identical SOT23 pinout (1=Base, 2=Emitter, 3=Collector), enabling direct layout reuse in complementary switch designs. However, polarity reversal requires inversion of control logic and supply connections.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current (I_BM) is −200 mA, but continuous operation must stay within I_C/h_FE(min) limits. At h_FE = 220 and I_C = −100 mA, recommended I_B is −455 µA minimum; practical design uses 2–5× that for saturation, staying well below −200 mA.

Does BC856B-QR support wave soldering?

Yes - Nexperia provides dedicated wave soldering footprints (Fig. 16) and process guidelines. The SOT23 package is qualified for wave soldering with preheat ≤100 °C, contact time ≤5 s, and solder temperature ≤260 °C, provided solder mask and land pattern follow Figure 16 specifications.

How does BC856B-QR perform at elevated junction temperatures?

h_FE decreases gradually above 25 °C, retaining ≥70% of room-temperature value at 150 °C (per Fig. 6). V_BE drops ~2 mV/°C, and V_CE(sat) rises modestly - all characterized in Figures 7–9. Derating is required above 25 °C ambient per R_th(j-a) = 500 K/W.

BC856B-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC856B-QR FAQ

1.How can I place an order for BC856B-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856B-QR 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 BC856B-QR reliable?

The price and inventory of BC856B-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856B-QR is usually 5 days.

3.What payment methods are accepted for BC856B-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856B-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856B-QR?

BC856B-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856B-QR 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 BC856B-QR?

For technical support, including BC856B-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856B-QR requirements.

6.How does Aetrix verify that BC856B-QR is sourced from the original manufacturer or authorized distributors?

All BC856B-QR 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 BC856B-QR meets industry standards.

7.What is the process for return or replacement of BC856B-QR?

All BC856B-QR units undergo pre-shipment inspection (PSI). If there is an issue with BC856B-QR, 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 BC856B-QR part is unused and in its original packaging.

Return procedure for BC856B-QR:

1.Submit a request within 90 days.

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

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