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

Nexperia USA Inc. BC857C/DG/B4R

Name: BC857C/DG/B4R
Brand: Nexperia USA Inc.
SKU: BC857C/DG/B4R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857C/DG/B4R

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC857C/DG/B4R.pdf

Description:: TRANS PNP 45V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC857C/DG/B4R from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −45 V V_CEO, −100 mA I_C, and 420–800 h_FE at V_CE = −5 V and I_C = −2 mA. It serves as a low-voltage, low-current switching or linear amplification device in compact consumer and industrial PCBs.

For engineers reviewing the BC857C/DG/B4R datasheet, BC857C/DG/B4R pinout, BC857C/DG/B4R application, or BC857C/DG/B4R equivalent, this page delivers verified electrical parameters, validated SOT23 pin mapping, real-world use cases in level-shifting and signal inversion, and confirmed alternative transistors with documented h_FE and voltage trade-offs.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with guaranteed DC current gain of 420–800 under standard test conditions (V_CE = −5 V, I_C = −2 mA). Its −45 V collector-emitter breakdown voltage and −50 V collector-base rating support reliable operation in low-to-mid voltage bias networks.

Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB with standard footprint, and maximum power dissipation is 250 mW at T_amb ≤ 25 °C. Saturation voltages are specified at −250 mV to −650 mV (V_CEsat) and −850 mV (V_BEsat) under pulsed I_C/I_B = 20 conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum safe collector-emitter voltage before breakdown in open-base configuration
I_C	−100 mA - Continuous DC collector current limit; defines max load drive capability in switching mode
h_FE	420–800 - DC current gain range at V_CE = −5 V, I_C = −2 mA; determines base drive sizing for saturation
V_CEsat	−250 mV to −650 mV - Collector-emitter voltage in saturation at I_C = −100 mA, I_B = −5 mA; impacts conduction loss
P_tot	250 mW - Total power dissipation on FR4 PCB at 25 °C ambient; constrains thermal design margin
f_T	100 MHz - Transition frequency at V_CE = −5 V, I_C = −10 mA; sets upper bound for small-signal amplification bandwidth

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.9 mm × 1.1 mm body, 0.45 mm nominal thickness, and standard reflow footprint per Fig. 15.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires current-limited drive to achieve target I_C based on h_FE range
2	Emitter (E)	Current source terminal; connected to higher potential rail in PNP common-emitter configurations
3	Collector (C)	Current sink terminal; ties to load or lower-potential node; must remain ≤ −45 V relative to emitter

Key Features

Feature	Design Value
Low-voltage PNP switching	Rated for −45 V V_CEO, enabling use in 3.3 V, 5 V, and 12 V rail-level logic and power control
High DC current gain	420–800 h_FE at I_C = −2 mA supports minimal base drive current in low-power sensor interfaces
Standard SOT23 footprint	Compatible with automated pick-and-place and reflow processes; matches JEDEC TO-236AB mechanical outline
Thermally robust packaging	500 K/W junction-to-ambient thermal resistance on FR4 ensures stable operation up to 150 °C junction temperature

Applications

Logic Level Shifting

Signal Inversion

Use Scenario: Converting 3.3 V microcontroller output to interface with 5 V legacy peripherals.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter topology to invert and translate logic levels.

Use Value: Low V_CEsat (< −650 mV) ensures clean high-state output; h_FE ≥ 420 allows direct GPIO drive without external buffer.

Use Scenario: Generating complementary enable signals for dual-rail power sequencing in embedded systems.

IC Role / Device Role / Timing Role: Active-low inverter stage driving enable inputs of PMICs or LDOs.

Use Value: Fast f_T (100 MHz) and low C_c (4.5 pF) minimize propagation delay; SOT23 size saves board space in dense power domains.

LED Current Control

Small-Signal Amplification

Use Scenario: Constant-current LED driver for status indicators in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Linear-mode current source with emitter resistor feedback.

Use Value: Tight h_FE tolerance (420–800) enables predictable current setting; −100 mA I_C rating covers typical indicator LEDs (20–30 mA).

Use Scenario: Pre-amplifier stage for analog sensor outputs (e.g., thermistor, photodiode) in data acquisition modules.

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

Use Value: 100 MHz f_T supports audio-band and low-MHz sensor signals; low NF (2–10 dB) preserves SNR in low-level analog paths.

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
BC847C	NPN complement; same h_FE range (420–800), but opposite polarity and +45 V V_CEO	Requires circuit topology reversal (e.g., high-side vs. low-side switching); not drop-in replaceable	Select when NPN topology aligns with existing bias network or when sourcing current from ground is preferred.
MMBT3906	Same PNP polarity; −40 V V_CEO, −200 mA I_C, h_FE 100–300 - lower gain, higher current, tighter V_CEO margin	Better suited for higher-load switching; less suitable for precision gain-dependent analog stages	Choose for cost-sensitive, high-volume switching where gain variation is acceptable and −40 V rating suffices.

Compared with BC857C/DG/B4R, BC847C requires full circuit redesign due to polarity inversion, while MMBT3906 trades gain consistency for higher current capacity and reduced voltage headroom-making BC857C optimal for gain-critical, low-power PNP roles in space-constrained designs.

Availability

BC857C/DG/B4R is available at Aetrix Electronics and suitable for logic level translation, LED driver circuits, signal inversion, and small-signal amplification requiring stable component supply across production batches and extended lifecycle windows.

Supply support for BC857C/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, industrial, and mobile applications.

The BC857 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-effective, space-efficient switching and amplification in consumer, computing, and industrial PCBs.

FAQ

What is the maximum operating temperature for BC857C/DG/B4R?

The BC857C/DG/B4R has a maximum junction temperature (T_j) of 150 °C and storage temperature range of −65 °C to +150 °C. Its thermal resistance is 500 K/W on standard FR4 PCB, so ambient temperature must be derated accordingly to avoid exceeding T_j at full 250 mW dissipation.

Is BC857C/DG/B4R pin-compatible with other SOT23 PNP transistors?

Yes - BC857C/DG/B4R uses standard SOT23 (TO-236AB) pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. This matches industry-standard PNP SOT23 transistors including MMBT3906 and PN2907A, enabling footprint reuse in layout.

How does BC857C differ from BC857B in terms of DC current gain?

BC857C guarantees h_FE of 420–800 at V_CE = −5 V and I_C = −2 mA, whereas BC857B specifies 220–475 under identical conditions. The C-grade offers higher and wider gain range, improving predictability in gain-dependent biasing and amplification circuits.

Can BC857C/DG/B4R be used in automotive applications?

No - BC857C/DG/B4R is not automotive-qualified. Per Nexperia's revision history (Rev. 9, July 2022), this part is designated for industrial and consumer use only. Automotive alternatives require explicit −Q qualification and separate AEC-Q101 testing, which this variant lacks.

BC857C/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):: 45 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

BC857C/DG/B4R FAQ

1.How can I place an order for BC857C/DG/B4R through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857C/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 BC857C/DG/B4R reliable?

The price and inventory of BC857C/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 BC857C/DG/B4R is usually 5 days.

3.What payment methods are accepted for BC857C/DG/B4R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857C/DG/B4R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857C/DG/B4R?

BC857C/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857C/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 BC857C/DG/B4R?

For technical support, including BC857C/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857C/DG/B4R requirements.

6.How does Aetrix verify that BC857C/DG/B4R is sourced from the original manufacturer or authorized distributors?

All BC857C/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 BC857C/DG/B4R meets industry standards.

7.What is the process for return or replacement of BC857C/DG/B4R?

All BC857C/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BC857C/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 BC857C/DG/B4R part is unused and in its original packaging.

Return procedure for BC857C/DG/B4R:

1.Submit a request within 90 days.

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

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