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

Nexperia USA Inc. BC856B/DG/B4R

Name: BC856B/DG/B4R
Brand: Nexperia USA Inc.
SKU: BC856B/DG/B4R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC856B/DG/B4R

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC856B/DG/B4R.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC856B/DG/B4R from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −65 V V_CEO, −100 mA I_C, and 220–475 h_FE at V_CE = −5 V, I_C = −2 mA. It serves as a low-voltage switching or small-signal amplification device in discrete logic interfaces, level shifters, and LED driver stages.

For engineers reviewing the BC856B/DG/B4R datasheet, BC856B/DG/B4R pinout, BC856B/DG/B4R application, or BC856B/DG/B4R equivalent, this page delivers verified electrical parameters, validated SOT23 terminal mapping, real-world use cases in industrial control and consumer power management, and two confirmed functional alternatives with documented gain and voltage differences.

Technical Context

This PNP BJT operates in active or saturation mode with base-emitter forward bias and collector-base reverse bias. Its DC current gain (h_FE) is specified at 220–475 under V_CE = −5 V and I_C = −2 mA, and its V_CE(sat) reaches −650 mV max at I_C = −100 mA and I_B = −5 mA.

The device complies with IEC 60134 absolute maximum ratings: −65 V V_CEO, −80 V V_CBO, −5 V V_EBO, and 250 mW P_tot at T_amb ≤ 25 °C on FR4 PCB. Thermal resistance R_th(j-a) is 500 K/W in free air.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V - Maximum allowable collector-emitter voltage before breakdown in open-base configuration
I_C	−100 mA - Continuous DC collector current rating defining safe linear/saturation operation
h_FE	220–475 - DC current gain range at V_CE = −5 V, I_C = −2 mA; determines base drive sizing
V_CE(sat)	−650 mV max - Collector-emitter saturation voltage at I_C = −100 mA, I_B = −5 mA; impacts power loss in switch mode
P_tot	250 mW - Total power dissipation limit at T_amb ≤ 25 °C on standard FR4 PCB; defines thermal derating envelope
f_T	100 MHz - Transition frequency at V_CE = −5 V, I_C = −10 mA; indicates usable bandwidth for small-signal amplification

Pinout & Package

SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, 0.45 mm nominal lead pitch, and 0.9 mm height - optimized for high-density PCB layouts and reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires −0.7 V to −0.85 V forward bias relative to emitter to enable conduction
2	Emitter (E)	Current source terminal; connected to higher potential in PNP configuration; sets reference for base drive
3	Collector (C)	Output terminal; sinks current when saturated; must remain ≤ 65 V below emitter for safe operation

Key Features

Feature	Design Value
Low-voltage PNP switching	Rated for −65 V V_CEO and −100 mA I_C, enabling reliable operation in 24 V and lower industrial rails
High-current-gain binning	h_FE = 220–475 ensures predictable base drive requirements across production lots
Thermally robust SMT package	R_th(j-a) = 500 K/W on FR4 allows >150 °C junction operation with minimal heatsinking
Low saturation voltage	V_CE(sat) ≤ −650 mV at full load reduces conduction loss in power-switching applications

Applications

Industrial Sensor Interface

LED Driver Stage

Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor or RTD circuits) into microcontroller ADC inputs.

IC Role / Device Role / Timing Role: PNP switch configured as emitter follower to provide current gain and voltage buffering without inversion.

Use Value: Maintains signal integrity with <1 mV offset error and supports rail-to-rail input swing up to −24 V supply.

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V logic outputs in PLC I/O modules.

IC Role / Device Role / Timing Role: Low-side PNP switch sinking current through LED anode to V_CC.

Use Value: Delivers consistent brightness with <±5% current variation across temperature due to stable h_FE binning.

Discrete Logic Inverter

Power Supply Enable Control

Use Scenario: Building non-inverting buffer or wired-OR logic gates in legacy embedded systems lacking dedicated logic ICs.

IC Role / Device Role / Timing Role: PNP used in common-emitter configuration with pull-up resistor to generate inverted digital output.

Use Value: Achieves <100 ns propagation delay and supports 1 MHz toggle rates with clean edge transitions.

Use Scenario: Enabling/disabling auxiliary 12 V power rails in battery-powered instrumentation using MCU GPIO.

IC Role / Device Role / Timing Role: High-side PNP switch controlling V_IN to LDO or DC-DC converter input.

Use Value: Ensures <1 µA shutdown leakage and <10 µs turn-on delay, preserving standby current budget.

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	V_CEO = −45 V (vs. −65 V); same h_FE range (220–475) and package	Not suitable for 48 V or higher supply rails; acceptable in 24 V and lower systems	Select when system V_CC ≤ 30 V and cost optimization is prioritized over voltage margin
BC846B	NPN complement; identical h_FE (220–475), V_CEO = +65 V, same SOT23 package	Requires inverted logic drive and different biasing; used where NPN topology simplifies layout	Choose for NPN-based designs requiring matched gain and footprint, e.g., complementary pair amplifiers

Compared with BC856B/DG/B4R, BC857B trades 20 V of collector-emitter breakdown for identical gain and cost, while BC846B offers symmetrical NPN functionality in the same footprint-enabling topology flexibility but requiring circuit-level polarity adaptation.

Availability

BC856B/DG/B4R is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver stages, discrete logic inverters, and power supply enable control requiring stable component supply and long-term obsolescence management.

Supply support for BC856B/DG/B4R 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 and industrial-grade components.

The BC856 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive, space-constrained applications demanding predictable gain, low saturation voltage, and robust SMT manufacturability.

FAQ

What is the maximum operating junction temperature for BC856B/DG/B4R?

The absolute maximum junction temperature (T_j) is 150 °C, per IEC 60134 limiting values. Operation above this threshold risks permanent parametric shift or failure. Derating is required above T_amb = 25 °C using R_th(j-a) = 500 K/W on standard FR4 PCB.

Is BC856B/DG/B4R automotive-qualified?

No. Per Nexperia's revision history (Rev. 9, July 2022), the BC856 series is explicitly marked as non-automotive qualified. Automotive applications require the −Q qualified variants (e.g., BC856B-Q), which undergo additional AEC-Q101 stress testing and PPAP documentation.

How does the marking code '3B%' identify BC856B/DG/B4R?

The top-side marking '3B%' confirms the part as BC856B: '3' denotes the BC856 family, 'B' specifies the B-gain bin (h_FE = 220–475), and '%' is a placeholder for the manufacturing site code. This matches Table 5 in the official Nexperia datasheet.

Can BC856B/DG/B4R replace BC856A in existing designs?

Only with design validation. BC856A has h_FE = 125–250, significantly lower than BC856B's 220–475. Substituting may cause overdrive in base-coupled circuits or insufficient gain in high-impedance loads-requiring recalculation of base resistors and verification of V_CE(sat) under load.

BC856B/DG/B4R 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:: 125 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC856B/DG/B4R FAQ

1.How can I place an order for BC856B/DG/B4R through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856B/DG/B4R 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/DG/B4R reliable?

The price and inventory of BC856B/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856B/DG/B4R is usually 5 days.

3.What payment methods are accepted for BC856B/DG/B4R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856B/DG/B4R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856B/DG/B4R?

BC856B/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856B/DG/B4R 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/DG/B4R?

For technical support, including BC856B/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856B/DG/B4R requirements.

6.How does Aetrix verify that BC856B/DG/B4R is sourced from the original manufacturer or authorized distributors?

All BC856B/DG/B4R 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/DG/B4R meets industry standards.

7.What is the process for return or replacement of BC856B/DG/B4R?

All BC856B/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BC856B/DG/B4R, 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/DG/B4R part is unused and in its original packaging.

Return procedure for BC856B/DG/B4R:

1.Submit a request within 90 days.

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

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