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Nexperia USA Inc. BC856W-QX
- Part No.:
- BC856W-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC856W-QX.pdf
- Description:
- TRANS PNP 65V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:6,071
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Product details
Overview
BC856W-Q from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT323 (SC-70) package, rated for −65 V VCEO, −100 mA IC, and DC current gain (hFE) of 125–475 at VCE = −5 V, IC = −2 mA. It serves as a low-power switching or linear amplification device in automotive signal conditioning, sensor interface, and power management circuits.
For engineers reviewing the BC856W-Q datasheet, BC856W-Q pinout, BC856W-Q application, or BC856W-Q equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (625 K/W), saturation voltage (−250 mV typ. at IC = −100 mA), and precise SC-70 footprint data - all critical for automotive-grade PCB layout and reliability validation.
Technical Context
The BC856W-Q operates as a discrete PNP BJT with fixed emitter-base and collector-base junctions, requiring external base current control to regulate collector current flow. Its −65 V VCEO rating supports operation in 24 V automotive supply rails with margin, while its −5 V VEBO enables safe biasing in common-emitter configurations with grounded emitters.
Thermal performance is defined by Rth(j-a) = 625 K/W on FR4 PCB (single-sided, 35 µm Cu), and it exhibits typical fT = 100 MHz, confirming suitability for audio-frequency amplification and low-speed digital switching up to ~10 MHz with adequate gain margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −65 V: Maximum allowable collector-emitter voltage before breakdown; supports 24 V automotive systems with ≥2× safety margin. |
| IC | −100 mA: Continuous DC collector current limit; suitable for driving LEDs, small relays, or logic-level translators. |
| hFE | 125–475 @ VCE = −5 V, IC = −2 mA: Stable DC current gain range enabling predictable base drive design for switching applications. |
| VCE(sat) | −250 mV typ. @ IC = −100 mA, IB = −5 mA: Low saturation voltage minimizes conduction loss in high-efficiency switch-mode stages. |
| Ptot | 200 mW @ Tamb ≤ 25 °C: Power dissipation limit defines maximum safe continuous operation on standard FR4 PCB without heatsinking. |
| Rth(j-a) | 625 K/W: Junction-to-ambient thermal resistance confirms need for careful thermal layout in enclosed automotive modules. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.3 mm × 2.2 mm footprint, 0.95 mm height, 3-lead configuration with gull-wing terminations optimized for reflow soldering per IPC-7095.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit IB and ensure reliable turn-on/turn-off timing. |
| 2 | Emitter (E) | Common reference terminal in common-emitter topology; connected to higher potential (e.g., battery rail) in PNP switching. |
| 3 | Collector (C) | Output current path; sinks load current when B-E junction is forward-biased; polarity must match PNP biasing convention. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Stress-tested per automotive discrete semiconductor standard; validated for under-hood temperature cycling (−40 °C to +150 °C) and humidity exposure. |
| Low VCE(sat) | −250 mV typical ensures <10 mW conduction loss at 100 mA, critical for thermally constrained automotive modules. |
| High hFE consistency | 125–475 range enables robust base drive design across production lots without recalibration. |
| SC-70 footprint | Compact 1.3 × 2.2 mm outline reduces PCB area by >40% vs. SOT23, supporting high-density automotive ECU layouts. |
Applications
| Automotive Door Module Switching | Engine Control Unit Signal Inversion |
|---|---|
|
Use Scenario: Controlling window lift motor direction via H-bridge enable/disable logic in door control units. IC Role / Device Role / Timing Role: PNP switch sourcing base current to N-channel MOSFET gate drivers; operates in saturated switching mode with <1 µs turn-off delay. Use Value: −250 mV VCE(sat) limits heat generation during frequent actuation cycles, extending module lifetime in high-vibration environments. |
Use Scenario: Inverting crankshaft position sensor output signals before feeding to microcontroller ADC inputs. IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network; provides clean 0–5 V logic swing from open-collector Hall sensor. Use Value: 125–475 hFE ensures stable gain across temperature (−40 °C to +125 °C), maintaining signal fidelity over full engine operating range. |
| Body Control Module LED Driver | Infotainment System Audio Preamp Stage |
|
Use Scenario: Driving status indicator LEDs (red/amber/green) on dashboard control panels with PWM dimming. IC Role / Device Role / Timing Role: Low-side switch sinking LED current; biased via MCU GPIO with current-limiting resistor. Use Value: −100 mA IC rating supports up to 3 parallel LEDs at 30 mA each, simplifying multi-color UI implementation. |
Use Scenario: Amplifying microphone bias voltage and low-level analog audio signals in rear-seat entertainment head units. IC Role / Device Role / Timing Role: Class-A common-emitter amplifier stage with emitter degeneration resistor for linearity. Use Value: 100 MHz fT and <2 dB noise figure at 1 kHz support wideband audio response (20 Hz–20 kHz) with minimal added distortion. |
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 |
|---|---|---|---|
| BC857W-Q | VCEO = −45 V, hFE = 125–800 | Lower voltage rating but wider gain range; less margin in 24 V systems with transients. | Select when higher hFE is needed for reduced base drive, and system VCEO stress remains <40 V. |
| BC846W-Q | NPN complement; VCEO = 65 V, IC = 100 mA, hFE = 110–800 | Opposite polarity; requires inverted biasing and complementary circuit topology. | Choose only for NPN-based designs where PNP functionality is not required; not a drop-in replacement. |
Compared with BC857W-Q, the BC856W-Q offers superior voltage margin for 24 V automotive use but narrower hFE spread; versus BC846W-Q, it enables direct high-side switching without level-shifting, simplifying power domain isolation in mixed-polarity control circuits.
Availability
BC856W-Q is available at Aetrix Electronics and suitable for automotive body control modules, engine management signal conditioning, and infotainment system analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC856W-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 BC856W-Q belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for cost-sensitive yet reliability-critical automotive subsystems including door modules, lighting controls, and sensor interfaces.
FAQ
Is BC856W-Q suitable for 12 V automotive battery monitoring circuits?
Yes. With −65 V VCEO and AEC-Q101 qualification, BC856W-Q safely handles load-dump transients (up to +40 V) and reverse-battery conditions (−14 V) common in 12 V systems. Its −100 mA IC and −250 mV VCE(sat) support precision shunt-based current sensing and low-loss switching in battery disconnect logic.
What is the maximum operating temperature for BC856W-Q in continuous use?
The BC856W-Q has a maximum junction temperature (Tj) of 150 °C and storage temperature range of −65 °C to +150 °C. When mounted on standard FR4 PCB (single-sided, 35 µm Cu), ambient temperature must be limited to ≤85 °C to maintain Tj ≤150 °C at full 100 mA load, based on Rth(j-a) = 625 K/W.
Can BC856W-Q replace BC856B in non-automotive designs?
Yes, with caveats. BC856W-Q shares identical electrical specs with BC856B (−65 V, −100 mA, hFE 220–475) but adds AEC-Q101 qualification, tighter process controls, and enhanced traceability. It is fully pin-compatible and electrically interchangeable, though its automotive-grade screening makes it preferable for mission-critical industrial applications.
Does BC856W-Q require derating at elevated ambient temperatures?
Yes. At Tamb = 100 °C, the 200 mW Ptot rating must be linearly derated to zero at 150 °C junction temperature, yielding a maximum allowable power dissipation of 100 mW. This corresponds to ~70 mA continuous collector current at VCE(sat) ≈ −250 mV, necessitating thermal analysis for sustained high-current operation.
BC856W-QX 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):
- 65 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 125 @ 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
BC856W-QX FAQ
1.How can I place an order for BC856W-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856W-QX 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 BC856W-QX reliable?
The price and inventory of BC856W-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856W-QX is usually 5 days.
3.What payment methods are accepted for BC856W-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856W-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856W-QX?
BC856W-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856W-QX 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 BC856W-QX?
For technical support, including BC856W-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856W-QX requirements.
6.How does Aetrix verify that BC856W-QX is sourced from the original manufacturer or authorized distributors?
All BC856W-QX 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 BC856W-QX meets industry standards.
7.What is the process for return or replacement of BC856W-QX?
All BC856W-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC856W-QX, 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 BC856W-QX part is unused and in its original packaging.
Return procedure for BC856W-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856W-QX Tags
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Diodes Incorporated
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BC847B,215
Nexperia USA Inc.
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