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

Diodes Incorporated BC856B-13-F

Name: BC856B-13-F
Brand: Diodes Incorporated
SKU: BC856B-13-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC856B-13-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: BC856B-13-F.pdf

Description:: TRANS PNP 65V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:46,676

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Product details

Overview

BC856B-13-F from Diodes Incorporated is a PNP small-signal transistor in SOT23 package, rated for -65 V V_CEO, -80 V V_CBO, and -100 mA I_C, with DC current gain (h_FE) of 220–475 at -2 mA, used in low-voltage switching and audio-frequency amplification circuits.

For engineers reviewing the BC856B-13-F datasheet, BC856B-13-F pinout, BC856B-13-F application, or BC856B-13-F equivalent, key selection criteria include V_CEO derating at elevated temperature, h_FE consistency across production lots, V_CE(sat) at -10 mA/-0.5 mA drive, and SOT23 thermal resistance under PCB copper area constraints.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined breakdown limits: V_CBO = -80 V, V_CEO = -65 V, and V_EBO = -5.0 V. Its f_T is 100–200 MHz at -5 V V_CE and -10 mA I_C, supporting AF amplifier and fast-switching applications up to ~100 kHz.

Thermal performance is characterized by R_θJA = 403 °C/W on minimum pad layout and 357 °C/W on 15 mm × 15 mm 1 oz copper. Safe operating area (SOA) is limited by V_CE(sat) at high current and power dissipation (P_D = 310 mW).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-65 V - Maximum collector-emitter voltage before avalanche breakdown under normal operation
h_FE	220–475 - DC current gain range at -2 mA I_C, -5 V V_CE; determines base drive sizing for switching
V_CE(sat)	-75 to -300 mV - Saturation voltage at -10 mA I_C/-0.5 mA I_B; impacts conduction loss in switch mode
f_T	100–200 MHz - Transition frequency at -5 V V_CE, -10 mA I_C; sets upper usable bandwidth for amplification
P_D	310 mW - Max continuous power dissipation on standard FR-4 PCB; defines thermal design margin
ESD HBM	4,000 V - Human Body Model rating per JESD22-A114; informs ESD handling requirements

Pinout & Package

Package: SOT23 - Surface-mount plastic package with 3 terminals, 0.008 g weight, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal	Connected to higher potential in PNP configuration; sets reference for base-emitter bias
2 (Base)	Control input	Receives negative current to turn on; requires current-limiting resistor for safe drive
3 (Collector)	Current sink terminal	Connected to load and supply return; carries full switched current in saturation

Key Features

Feature	Design Value
JEDEC-qualified reliability	Qualified to AEC-Q standards for high-reliability industrial use, not automotive-grade
Green compound packaging	Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb), compliant with RoHS 3
Lead-free plating	Matte tin finish on leads, fully compliant with EU Directive 2015/863/EU and MIL-STD-202
SOT23 mechanical compatibility	Standardized footprint enabling automated insertion and reflow assembly with known thermal pad layout

Applications

LED Driver Circuit

Level-Shifting Interface

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

IC Role / Device Role / Timing Role: PNP switch providing active-low current sinking path with minimal V_CE(sat) loss.

Use Value: Enables direct GPIO control without external level translators; V_CE(sat) ≤ -300 mV ensures >3.0 V LED forward voltage margin.

Use Scenario: Translating 5 V logic signals to 3.3 V domains in mixed-supply digital systems.

IC Role / Device Role / Timing Role: Active-pull-up level shifter using emitter-follower configuration.

Use Value: Provides rail-to-rail output swing with h_FE-dependent input impedance; avoids timing skew from passive resistive dividers.

Audio Preamp Stage

Power Supply Enable Switch

Use Scenario: Low-noise preamplifier stage for electret microphone biasing in portable audio devices.

IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network and bypassed emitter resistor.

Use Value: NF = 2–10 dB at 1 kHz enables SNR > 60 dB; f_T > 100 MHz supports wideband audio fidelity.

Use Scenario: Enabling/disabling 12 V auxiliary rails in industrial controllers via 3.3 V MCU signal.

IC Role / Device Role / Timing Role: High-side switch controlling PMOS gate drive or relay coil current.

Use Value: V_CEO = -65 V provides 5× safety margin over 12 V rail; I_C = -100 mA supports typical enable loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC857B-13-F	V_CEO = -45 V, V_CBO = -50 V, h_FE = 220–475 - lower voltage ratings but identical gain bin	Not suitable for 60 V bus monitoring; acceptable for ≤40 V logic-level switching	Select when system V_CC ≤ 40 V and cost optimization is prioritized over voltage headroom
MMBT856LT1G	V_CEO = -65 V, h_FE = 120–250 - same voltage rating but narrower gain range and Onsemi branding	Lower h_FE requires larger base drive; validated for automotive temp range (-55°C to +150°C)	Choose for AEC-Q200-compliant designs where gain tolerance is less critical than qualification status

Compared with BC857B-13-F, BC856B-13-F offers 20 V higher V_CEO headroom for robustness in fluctuating supply environments; versus MMBT856LT1G, it delivers broader h_FE consistency for predictable base resistor selection across production batches.

Availability

BC856B-13-F is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, and audio preamp stages requiring stable component supply, consistent h_FE binning, and RoHS 3-compliant packaging.

Supply support for BC856B-13-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and consumer markets.

This part belongs to the BC856x–BC858x PNP transistor family, designed for cost-sensitive, space-constrained switching and amplification applications where SOT23 footprint and JEDEC-qualified reliability are essential.

FAQ

What is the maximum allowable junction temperature for BC856B-13-F?

The absolute maximum junction temperature is +150°C, with storage temperature matching this range. Operation above this limit risks permanent degradation of h_FE and increased leakage. Thermal design must ensure T_J stays below 150°C under worst-case ambient and power dissipation conditions, using R_θJA = 403 °C/W for standard layouts.

Is BC856B-13-F qualified for automotive applications?

No - BC856B-13-F is not AEC-Q200 qualified. Diodes offers automotive variants under separate part numbers (e.g., BC856BQ), which undergo additional stress testing and lot traceability. This part meets industrial reliability standards per JEDEC but lacks automotive-specific qualification documentation and screening.

How does the marking "K3B" relate to BC856B-13-F?

"K3B" is the top-side laser marking code identifying the BC856B device grade. It appears on the SOT23 package and corresponds to the "B" gain bin (h_FE = 220–475) within the BC856 series. The "13-F" suffix denotes 13-inch reel packaging with 10,000 units per reel and lead-free finish.

Can BC856B-13-F replace BC856A-7-F in existing designs?

Yes, with attention to gain and packaging differences: BC856B has higher h_FE (220–475 vs. 125–250) and comes on a 13-inch reel (10,000 pcs) instead of 7-inch (3,000 pcs). Electrical parameters including V_CEO, V_CBO, and V_CE(sat) are identical. No circuit changes are needed unless base drive was optimized for the lower A-bin gain.

BC856B-13-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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):: 15µA (ICBO)

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

Power - Max:: 310 mW

Frequency - Transition:: 200MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BC856B-13-F FAQ

1.How can I place an order for BC856B-13-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC856B-13-F 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-13-F reliable?

The price and inventory of BC856B-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856B-13-F is usually 5 days.

3.What payment methods are accepted for BC856B-13-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856B-13-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC856B-13-F?

BC856B-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC856B-13-F 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-13-F?

For technical support, including BC856B-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856B-13-F requirements.

6.How does Aetrix verify that BC856B-13-F is sourced from the original manufacturer or authorized distributors?

All BC856B-13-F 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-13-F meets industry standards.

7.What is the process for return or replacement of BC856B-13-F?

All BC856B-13-F units undergo pre-shipment inspection (PSI). If there is an issue with BC856B-13-F, 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-13-F part is unused and in its original packaging.

Return procedure for BC856B-13-F:

1.Submit a request within 90 days.

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

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