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

Nexperia USA Inc. BC857CW/MIX

Name: BC857CW/MIX
Brand: Nexperia USA Inc.
SKU: BC857CW/MIX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857CW/MIX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC857CW/MIX.pdf

Description:: TRANS PNP 45V 0.1A SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:5,152

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Product details

Overview

BC857CW/MIX from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for −45 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 420–800 at V_CE = −5 V and I_C = −2 mA. It serves as a low-power switching and amplification device in compact consumer and industrial signal-path circuits.

For engineers reviewing the BC857CW/MIX datasheet, BC857CW/MIX pinout, BC857CW/MIX application, or BC857CW/MIX equivalent, key selection criteria include its guaranteed h_FE range, −45 V breakdown rating, SOT323 thermal resistance (625 K/W), and compatibility with reflow-soldered high-density PCB layouts.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with defined V_CE(sat) ≤ −600 mV at I_C = −100 mA and I_B = −5 mA, and V_BE(sat) ≤ −850 mV under identical conditions. Its f_T of 100 MHz supports audio-frequency amplification and low-speed digital switching.

Thermal performance is characterized by R_th(j-a) = 625 K/W on FR4 PCB (single-sided, 35 µm Cu), and absolute maximum ratings include T_j = 150 °C, V_EBO = −5 V, and P_tot = 200 mW at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum collector-emitter voltage before breakdown in open-base configuration; defines safe operating voltage headroom in PNP switch designs.
I_C	−100 mA - Continuous collector current rating; sets upper limit for load-driving capability in linear or saturated operation.
h_FE	420–800 at V_CE = −5 V, I_C = −2 mA - Guaranteed DC current gain range enabling predictable base drive sizing for consistent switching behavior.
V_CE(sat)	≤ −600 mV at I_C = −100 mA, I_B = −5 mA - Low saturation voltage minimizes power loss and heating in high-duty-cycle switching applications.
f_T	100 MHz - Transition frequency confirming usable bandwidth up to audio and low-RF frequencies without significant gain roll-off.
R_th(j-a)	625 K/W - Junction-to-ambient thermal resistance on standard FR4 PCB; informs derating requirements above 25 °C ambient.

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H); standard footprint compatible with reflow and wave soldering per Nexperia's recommended land patterns.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires current-limited drive to bias transistor into active or saturation region; polarity-sensitive for PNP operation.
2	Emitter (E)	Current source terminal in PNP configuration; connected to higher potential rail in common-emitter switch topologies.
3	Collector (C)	Current sink terminal; delivers load current to ground or lower-potential node; must withstand −45 V reverse bias in off-state.

Key Features

Feature	Design Value
High h_FE binning	420–800 ensures stable gain across production lots, reducing need for individual base-resistor tuning in volume manufacturing.
Low V_CE(sat)	≤ −600 mV at full rated current enables <100 mW dissipation in saturation, supporting thermally constrained PCB layouts.
SOT323 footprint	0.65 mm pitch and 2.2 mm length allow placement in space-constrained areas such as wearables and sensor modules.
150 °C max junction temperature	Supports operation in sealed enclosures or near heat sources without forced cooling, provided derating rules are followed.

Applications

LED Driver Circuit

Level-Shifting Interface

Use Scenario: Driving discrete indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins with current limiting.

IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to supply rail; provides inverted logic-level control.

Use Value: Low V_CE(sat) ensures >95% efficiency in LED current path; SOT323 size allows integration adjacent to RGB LED footprints.

Use Scenario: Translating 1.8 V logic outputs to 5 V-tolerant inputs in mixed-voltage MCU subsystems.

IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter configuration for bidirectional signal adaptation.

Use Value: Guaranteed h_FE ≥ 420 ensures reliable turn-on margin with weak drive sources; f_T supports rise/fall times <10 ns.

Signal Amplifier Stage

Power Sequencing Control

Use Scenario: Low-noise preamplification of analog sensor signals (e.g., thermistor, photodiode) before ADC input.

IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network; provides voltage gain and impedance transformation.

Use Value: NF = 2–10 dB at 1 kHz enables sub-mV signal recovery; V_BE stability over −55 to +150 °C maintains bias point accuracy.

Use Scenario: Enabling/disabling auxiliary power rails (e.g., 3.3 V, 1.8 V) in sequence during system boot or sleep transitions.

IC Role / Device Role / Timing Role: High-side switch controlling PMOS gate drive or LDO enable line; provides controlled ramp-up timing.

Use Value: −45 V V_CEO accommodates 24 V auxiliary supplies; 200 mW P_tot rating supports sustained 100 mA enable currents.

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
BC857BW	h_FE = 220–475 (lower gain band); same V_CEO, I_C, and package	Suitable where moderate gain suffices and tighter h_FE tolerance is not required	Select when cost sensitivity outweighs need for high-current gain consistency
BC847CW	NPN complement; identical h_FE (420–800), V_CEO = +45 V, same SOT323 package	Used in low-side switching or NPN amplifier configurations requiring polarity inversion	Choose for complementary pair design or when circuit topology mandates NPN topology

Compared with BC857BW, BC857CW offers higher and more tightly binned h_FE for improved current-source stability; versus BC847CW, it provides PNP polarity essential for high-side control and inverted logic interfaces where NPN cannot substitute directly.

Availability

BC857CW/MIX is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, analog signal amplification, and power sequencing control requiring stable component supply and SOT323 footprint compatibility.

Supply support for BC857CW/MIX 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-grade and industrial-standard components.

The BC857CW belongs to Nexperia's BC856W/BC857W/BC858W series of general-purpose PNP transistors designed for cost-sensitive, space-constrained switching and amplification in consumer, computing, and industrial electronics.

FAQ

What is the maximum continuous collector current for BC857CW/MIX?

The BC857CW/MIX is rated for a maximum continuous collector current (I_C) of −100 mA at T_amb ≤ 25 °C. Derating is required above this ambient temperature per the thermal resistance (R_th(j-a) = 625 K/W) and power dissipation limit (P_tot = 200 mW).

Does BC857CW/MIX have automotive qualification?

No. BC857CW/MIX is not automotive-qualified per AEC-Q101. It is specified for industrial and consumer applications only. Nexperia explicitly states that non-automotive qualified products are unsuitable for safety-critical or life-support systems without additional validation by the customer.

How does the h_FE of BC857CW compare to BC857AW and BC857BW?

BC857CW has h_FE = 420–800 at V_CE = −5 V and I_C = −2 mA, exceeding BC857AW (125–250) and BC857BW (220–475). This higher and wider gain range supports more robust base-drive margin in variable-temperature or high-precision current-source designs.

Can BC857CW/MIX be used in linear amplifier configurations?

Yes. With f_T = 100 MHz, V_BE stability across −55 to +150 °C, and low noise figure (2–10 dB at 1 kHz), BC857CW is suitable for low-frequency linear amplification-e.g., sensor signal conditioning-provided biasing remains within V_CEO (−45 V) and P_tot (200 mW) limits.

BC857CW/MIX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 420 @ 2mA, 5V

Power - Max:: 200 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BC857CW/MIX FAQ

1.How can I place an order for BC857CW/MIX through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857CW/MIX 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 BC857CW/MIX reliable?

The price and inventory of BC857CW/MIX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CW/MIX is usually 5 days.

3.What payment methods are accepted for BC857CW/MIX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CW/MIX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857CW/MIX?

BC857CW/MIX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857CW/MIX 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 BC857CW/MIX?

For technical support, including BC857CW/MIX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CW/MIX requirements.

6.How does Aetrix verify that BC857CW/MIX is sourced from the original manufacturer or authorized distributors?

All BC857CW/MIX 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 BC857CW/MIX meets industry standards.

7.What is the process for return or replacement of BC857CW/MIX?

All BC857CW/MIX units undergo pre-shipment inspection (PSI). If there is an issue with BC857CW/MIX, 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 BC857CW/MIX part is unused and in its original packaging.

Return procedure for BC857CW/MIX:

1.Submit a request within 90 days.

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

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