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

Nexperia USA Inc. BC856B/DG/B3,235

Name: BC856B/DG/B3,235
Brand: Nexperia USA Inc.
SKU: BC856B/DG/B3,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC856B/DG/B3,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC856B/DG/B3,235.pdf

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

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Product details

Overview

BC856B/DG/B3,235 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/B3,235 datasheet, BC856B/DG/B3,235 pinout, BC856B/DG/B3,235 application, or BC856B/DG/B3,235 equivalent, key selection criteria include verified PNP polarity, SOT23 footprint compatibility, guaranteed h_FE ≥220 at low I_C, V_CEO = −65 V rating, and thermal resistance R_th(j-a) = 500 K/W on FR4 PCB.

Technical Context

This transistor operates in active or saturation mode with fixed PNP polarity, requiring reverse-biased base-emitter junction for conduction. Its DC current gain (h_FE) is specified at V_CE = −5 V and I_C = −2 mA, with typical values spanning 220–475 - enabling predictable biasing in linear and switching configurations.

V_CEO = −65 V and V_CBO = −80 V define safe blocking capability under open-base and open-emitter conditions respectively, while V_BE(sat) ≤ −850 mV at I_C = −100 mA / I_B = −5 mA ensures reliable turn-on in saturated switch applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V: Maximum collector-emitter voltage before breakdown with base open; defines safe operating range in high-side switch topologies.
I_C	−100 mA: Continuous DC collector current limit; sets upper bound for load-driving capability in signal-level circuits.
h_FE	220–475 at V_CE = −5 V, I_C = −2 mA: Confirmed DC current gain range supporting stable bias design without external feedback.
V_CE(sat)	−250 to −650 mV at I_C = −100 mA, I_B = −5 mA: Low saturation voltage minimizes power loss and heating in switching operation.
R_th(j-a)	500 K/W on FR4 PCB: Thermal resistance determines junction temperature rise under 250 mW dissipation; critical for ambient-limited designs.
f_T	100 MHz at V_CE = −5 V, I_C = −10 mA: Transition frequency confirms usable bandwidth up to ~10 MHz in common-emitter amplifier configurations.

Pinout & Package

BC856B/DG/B3,235 uses the standard SOT23 (TO-236AB) surface-mount plastic package: 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height, with gull-wing leads and tin-plated terminations compatible with reflow and wave soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; reverse-biased relative to emitter to enable PNP conduction; requires current sink for activation.
2	Emitter (E)	Current source terminal; connected to higher potential rail in high-side switch applications; defines reference for V_BE.
3	Collector (C)	Output/switching terminal; carries load current toward lower-potential node; must withstand −65 V reverse voltage when off.

Key Features

Feature	Design Value
Low-voltage PNP switching	Rated for −65 V V_CEO and −100 mA I_C, enabling use in 24 V and lower rail systems without derating.
Guaranteed DC current gain	h_FE ≥220 at I_C = −2 mA ensures predictable base drive requirements across production lots.
SOT23 package compatibility	Standard TO-236AB outline supports automated placement and reflow on 0.5 mm pitch land patterns per Nexperia's sot023_fr footprint.
Thermal performance on FR4	500 K/W R_th(j-a) allows 250 mW dissipation at ≤25 °C ambient, supporting continuous operation in compact layouts.

Applications

LED Driver Stage

Level Shifter Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller GPIO pins with inverted logic control.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking current from LED anode to ground via collector.

Use Value: V_CE(sat) ≤ −650 mV ensures <13 mW power loss per LED, preserving GPIO voltage margin and reducing thermal load.

Use Scenario: Translating 1.8 V logic-high signals to 5 V domain in mixed-voltage digital subsystems.

IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower configuration with pull-up to 5 V rail.

Use Value: h_FE ≥220 guarantees sufficient current gain to drive 10 kΩ loads without signal degradation or propagation delay increase.

Discrete Logic Inverter

Power Rail Monitor Switch

Use Scenario: Implementing non-inverting buffer stages in legacy TTL-compatible circuitry where IC-level solutions are unavailable.

IC Role / Device Role / Timing Role: PNP-based common-collector amplifier providing unity-gain voltage buffering with high input impedance.

Use Value: V_BE ≈ −650 mV at I_C = −10 mA enables precise threshold setting for Schmitt-trigger inputs in noise-prone environments.

Use Scenario: Enabling auxiliary power rails only when main 12 V supply exceeds 11.4 V, using resistor-divider + base bias network.

IC Role / Device Role / Timing Role: High-side enable switch controlling PMOS gate drive or LDO EN pin based on analog threshold detection.

Use Value: V_CEO = −65 V provides 5× safety margin over 12 V rail, eliminating risk of breakdown during load-dump transients.

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, h_FE = 220–475, same SOT23 package	Lower voltage rating limits use in >45 V systems; otherwise pin- and function-compatible	Select when system max V_CE ≤45 V and tighter h_FE distribution is required
MMBT3906	V_CEO = −40 V, h_FE = 100–300, same SOT23 footprint but different pinout (E-B-C vs B-E-C)	Requires PCB layout revision due to reversed emitter/base pin assignment; lower gain spread	Choose only if redesign accommodates pinout change and −40 V rating suffices

Compared with BC856B/DG/B3,235, BC857B trades 20 V of blocking margin for identical gain and package, while MMBT3906 demands board-level adaptation and sacrifices 25 V V_CEO headroom - making BC856B the optimal choice for 65 V-rated or legacy-design continuity needs.

Availability

BC856B/DG/B3,235 is available at Aetrix Electronics and suitable for LED driver stages, level shifter interfaces, discrete logic inverters, and power rail monitor switches requiring stable component supply and long-term obsolescence management.

Supply support for BC856B/DG/B3,235 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 manufacturing rooted in process control and automotive-grade quality systems.

BC856B/DG/B3,235 belongs to Nexperia's BC856/BC857/BC858 family of general-purpose PNP transistors designed for cost-sensitive, space-constrained consumer and industrial signal-path applications where robustness and consistency outweigh ultra-high-speed or high-power demands.

FAQ

What is the maximum allowable collector-emitter voltage for BC856B/DG/B3,235?

The absolute maximum collector-emitter voltage (V_CEO) is −65 V with base open, as defined in Table 6 of the Nexperia datasheet Rev. 9. This rating applies at T_amb ≤ 150 °C and must not be exceeded under any operating condition to prevent permanent device damage.

Does BC856B/DG/B3,235 have automotive qualification?

No. Per Section 13 (Revision History) and Legal Information in the datasheet, BC856B/DG/B3,235 is explicitly marked as non-automotive qualified. Nexperia offers separate −Q automotive variants (e.g., BC856B-Q) with extended temperature testing and AEC-Q101 compliance - this part is intended for industrial and consumer applications only.

How does the h_FE of BC856B/DG/B3,235 compare to BC856A and BC856?

BC856B/DG/B3,235 has h_FE = 220–475 at V_CE = −5 V, I_C = −2 mA, whereas BC856A is 125–250 and standard BC856 is 125–475. The 'B' suffix denotes tighter mid-range gain distribution, improving predictability in bias-critical amplifier and switch designs without requiring gain-bin sorting.

Can BC856B/DG/B3,235 be used in linear amplifier configurations?

Yes - its f_T = 100 MHz and h_FE stability across I_C (Fig. 6) support small-signal common-emitter amplification up to ~10 MHz. However, it lacks specified noise figure below 1 kHz and is not optimized for low-noise audio; use is appropriate for non-critical gain stages where cost and footprint dominate.

BC856B/DG/B3,235 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:: 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:: 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/B3,235 FAQ

1.How can I place an order for BC856B/DG/B3,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856B/DG/B3,235 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/B3,235 reliable?

The price and inventory of BC856B/DG/B3,235 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/B3,235 is usually 5 days.

3.What payment methods are accepted for BC856B/DG/B3,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856B/DG/B3,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856B/DG/B3,235?

BC856B/DG/B3,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856B/DG/B3,235 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/B3,235?

For technical support, including BC856B/DG/B3,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856B/DG/B3,235 requirements.

6.How does Aetrix verify that BC856B/DG/B3,235 is sourced from the original manufacturer or authorized distributors?

All BC856B/DG/B3,235 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/B3,235 meets industry standards.

7.What is the process for return or replacement of BC856B/DG/B3,235?

All BC856B/DG/B3,235 units undergo pre-shipment inspection (PSI). If there is an issue with BC856B/DG/B3,235, 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/B3,235 part is unused and in its original packaging.

Return procedure for BC856B/DG/B3,235:

1.Submit a request within 90 days.

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

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