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Nexperia USA Inc. BC857CW-QF
- Part No.:
- BC857CW-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857CW-QF.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:8,150
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Product details
Overview
BC857CW-Q from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT323 (SC-70) package, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 420–800 at VCE = −5 V and IC = −2 mA. It serves as a low-power switching or linear amplification device in automotive signal conditioning, sensor interface, and LED driver stages.
For engineers reviewing the BC857CW-Q datasheet, BC857CW-Q pinout, BC857CW-Q application, or BC857CW-Q equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (625 K/W), saturation voltage (−250 mV max at IC = −100 mA), and marking code "3G%" - all confirmed from Nexperia's Rev. 2 product data sheet dated 10 July 2023.
Technical Context
This PNP BJT operates with base-emitter forward bias enabling controlled collector current flow up to −100 mA, featuring low saturation voltage (−250 mV max) and high hFE consistency across temperature (−55 °C to +150 °C). Its −45 V VCEO rating supports mid-voltage rail applications in 12 V/24 V automotive subsystems.
Designed for surface-mount assembly on FR4 PCBs with standard SC-70 footprint, it exhibits thermal resistance of 625 K/W (junction-to-ambient, free air), and meets AEC-Q101 stress test requirements for automotive use - including HTOL, temperature cycling, and ESD robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before breakdown under open-base condition; enables use in 24 V automotive logic and power control stages. |
| IC | −100 mA: Continuous DC collector current rating; suitable for driving small relays, LEDs, or logic-level translators without heatsinking. |
| hFE | 420–800 @ VCE = −5 V, IC = −2 mA: High and stable DC current gain ensures predictable base drive requirements in amplifier and switch configurations. |
| VCE(sat) | −250 mV max @ IC = −100 mA, IB = −5 mA: Low saturation voltage minimizes power loss and heat generation in switching applications. |
| Rth(j-a) | 625 K/W: Junction-to-ambient thermal resistance on standard FR4 PCB; defines maximum allowable power dissipation (200 mW) at Tamb ≤ 25 °C. |
| AEC-Q101 | Qualified: Certified for automotive applications per AEC-Q101 stress test standard; supports deployment in engine control, body electronics, and ADAS submodules. |
| Package | SOT323 (SC-70): 3-pin ultra-small surface-mount package (2.2 × 1.35 × 0.95 mm); enables high-density PCB layouts in space-constrained modules. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; dimensions: 2.2 mm × 1.35 mm × 0.95 mm; standard footprint per Figure 15 (reflow soldering).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; forward-biased relative to emitter to enable conduction; requires ~−0.7 V VBE for turn-on. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; connected to higher potential rail (e.g., +12 V) in common-emitter switch layouts. |
| 3 | Collector (C) | Current sink terminal; delivers load current to ground or lower-potential node; handles up to −100 mA continuous. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per AEC-Q101 stress tests - including HTOL, temperature cycling, and ESD - enabling drop-in use in vehicle ECUs. |
| High hFE bin (C-grade) | 420–800 gain range ensures tight base-current tolerance in precision bias networks and low-noise preamplifier stages. |
| Low VCE(sat) | ≤ −250 mV at full rated current reduces conduction losses by >30% vs. standard BJT alternatives, improving efficiency in battery-powered modules. |
| Ultra-small SOT323 | 0.95 mm profile and 2.2 × 1.35 mm footprint support miniaturized designs in infotainment, telematics, and sensor nodes. |
| −5 V VEBO | Emitter-base breakdown voltage allows safe operation with up to 5 V reverse bias - critical for protection against transient polarity reversal in sensor interfaces. |
Applications
| Automotive Door Module Switching | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Controlling window lift motor direction via H-bridge gate logic in door control units. IC Role / Device Role / Timing Role: PNP switch enabling high-side pull-up of N-channel MOSFET gates during reverse motor activation. Use Value: −250 mV VCE(sat) ensures minimal voltage drop across the transistor, preserving gate drive margin and reducing thermal stress on adjacent drivers. |
Use Scenario: Amplifying low-level analog output from thermistor-based temperature sensors in PLC input modules. IC Role / Device Role / Timing Role: Linear-mode PNP amplifier configured in common-emitter topology with emitter degeneration for stable DC gain. Use Value: 420–800 hFE provides consistent transconductance across production lots, minimizing calibration drift in 12-bit ADC front-ends. |
| LED Status Indicator Driver | Power Supply Enable Control |
|
Use Scenario: Driving dual-color status LEDs (red/green) on industrial HMI panels with shared anode configuration. IC Role / Device Role / Timing Role: Low-current PNP switch sinking LED cathode current (≤20 mA) while referenced to 3.3 V logic rails. Use Value: −45 V VCEO headroom prevents breakdown during 3.3 V supply transients, ensuring reliable LED visibility over 10+ year field life. |
Use Scenario: Enabling/disabling auxiliary 5 V LDO output in automotive infotainment power tree based on MCU GPIO signal. IC Role / Device Role / Timing Role: Level-shifting switch translating 3.3 V MCU output to 5 V enable line, with fast turn-off due to low Cc (3 pF). Use Value: 3 pF collector capacitance minimizes propagation delay (<100 ns), preventing brown-out during power sequencing transitions. |
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-Q | hFE = 220–475 (lower gain range); same VCEO, IC, and package | Less suitable for low-base-drive amplifier stages; better for cost-sensitive digital switching where gain tolerance is relaxed | Select when design tolerates wider hFE variation and prioritizes BOM cost over gain stability |
| BC847CW-Q | NPN complement; identical hFE (420–800), VCEO = +45 V, same SOT323 package and marking "3G%" | Used in low-side switching or NPN amplifier topologies; not interchangeable without circuit redesign | Choose for complementary NPN pairing in push-pull outputs or differential amplifiers requiring matched gain bins |
Compared with BC857BW-Q, BC857CW-Q offers tighter hFE control for precision biasing; versus BC847CW-Q, it provides PNP polarity essential for high-side switching and level translation above ground-referenced logic.
Availability
BC857CW-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and LED driver circuits requiring stable component supply, AEC-Q101 compliance, and long-term lifecycle continuity.
Supply support for BC857CW-Q 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 components and advanced packaging.
The BC857CW-Q belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, designed specifically for robust, space-efficient switching and amplification in automotive and industrial control systems.
FAQ
What is the marking code for BC857CW-Q on the package?
The BC857CW-Q is marked with "3G%" on the top surface of the SOT323 package, where "%" is a placeholder for the manufacturing site code. This marking is defined in Table 5 of the official Nexperia datasheet Rev. 2 (10 July 2023) and distinguishes it from other variants like BC857BW-Q ("3F%") and BC857AW-Q ("3E%").
Does BC857CW-Q support reflow soldering, and what is its maximum peak temperature?
Yes, BC857CW-Q is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its maximum peak temperature is 260 °C for ≤30 seconds, compatible with standard Class 3 IPC reflow profiles. The recommended footprint matches Figure 15 in the datasheet, with 0.55 mm solder paste stencil openings for each of the three pads.
How does BC857CW-Q differ from BC857W-Q in terms of DC current gain?
BC857CW-Q has hFE = 420–800 at VCE = −5 V and IC = −2 mA, whereas BC857W-Q (unbinned) has hFE = 125–800. The "C" suffix denotes the highest-gain bin, providing tighter distribution for designs requiring predictable base drive and reduced gain-related variance in production.
Is BC857CW-Q suitable for linear amplification, and what is its typical noise figure?
Yes, BC857CW-Q is specified for linear operation with NF = 2 dB (typical) at IC = −200 µA, VCE = −5 V, RS = 2 kΩ, f = 1 kHz, and bandwidth = 200 Hz. Its low 1/f noise and stable hFE make it appropriate for low-frequency preamplifier stages in automotive cabin sensors and industrial analog front-ends.
BC857CW-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857CW-QF FAQ
1.How can I place an order for BC857CW-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CW-QF 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-QF reliable?
The price and inventory of BC857CW-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CW-QF is usually 5 days.
3.What payment methods are accepted for BC857CW-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CW-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CW-QF?
BC857CW-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CW-QF 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-QF?
For technical support, including BC857CW-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CW-QF requirements.
6.How does Aetrix verify that BC857CW-QF is sourced from the original manufacturer or authorized distributors?
All BC857CW-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BC857CW-QF?
All BC857CW-QF units undergo pre-shipment inspection (PSI). If there is an issue with BC857CW-QF, 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-QF part is unused and in its original packaging.
Return procedure for BC857CW-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CW-QF Tags
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