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Nexperia USA Inc. BC858W-QF
- Part No.:
- BC858W-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC858W-QF.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:5,655
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Product details
Overview
BC858W-Q from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT323 (SC-70) package, rated for −30 V VCEO, −100 mA IC, and DC current gain (hFE) of 125–800 at VCE = −5 V and IC = −2 mA. It serves as a low-power switching or linear amplification device in automotive signal conditioning and sensor interface circuits.
For engineers reviewing the BC858W-Q datasheet, BC858W-Q pinout, BC858W-Q application, or BC858W-Q equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (625 K/W), saturation voltage (VCE(sat) ≤ −600 mV at IC = −100 mA), and automotive-grade reliability data - all critical for board-level validation and BOM selection.
Technical Context
This PNP transistor operates with open-base collector-emitter breakdown voltage of −30 V and emitter-base breakdown voltage of −5 V, enabling robust operation in low-voltage bias networks. Its hFE range (125–800) supports both high-gain amplification and predictable switching across temperature (−55 °C to +150 °C).
VCE(sat) remains ≤ −600 mV at IC = −100 mA and IB = −5 mA, ensuring low conduction loss in active-low load control. Thermal resistance Rth(j-a) is 625 K/W on FR4 PCB, defining power derating limits under ambient conditions up to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V: Maximum safe collector-emitter voltage with base open; defines upper rail limit in PNP switch configurations. |
| IC | −100 mA: Continuous DC collector current; suitable for driving LEDs, small relays, or logic-level interfaces. |
| hFE | 125–800 @ VCE = −5 V, IC = −2 mA: Gain spread enables design margining for production variation in bias networks. |
| VCE(sat) | ≤ −600 mV @ IC = −100 mA, IB = −5 mA: Ensures <0.6 V drop across collector-emitter during saturation, minimizing power loss. |
| Rth(j-a) | 625 K/W: Junction-to-ambient thermal resistance on standard FR4 PCB; used to calculate max allowable power at given Tamb. |
| Ptot | 200 mW @ Tamb ≤ 25 °C: Total dissipation limit; derates linearly above 25 °C per thermal resistance. |
| AEC-Q101 | Qualified: Meets stress test requirements for automotive discrete semiconductors; supports under-hood and body-control applications. |
Pinout & Package
SOT323 (SC-70) surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration optimized for high-density PCB layouts and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires current-limited drive to achieve target IC; polarity-sensitive for PNP turn-on (negative relative to emitter). |
| 2 | Emitter (E) | Current source terminal; connected to higher potential rail in PNP switch; sets reference for VBE and VCE measurements. |
| 3 | Collector (C) | Current sink terminal; connects to load; voltage here must remain ≤ VE − |VCEO| to avoid breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test standard; eliminates need for additional qualification by Tier 1 suppliers. |
| Low saturation voltage | VCE(sat) ≤ −600 mV ensures minimal voltage overhead in 3.3 V or 5 V rail-switching applications. |
| Wide hFE range | 125–800 enables single-BOM flexibility across gain-critical and gain-tolerant designs without redesign. |
| Small-outline SMT package | SOT323 footprint saves >50% board area vs. SOT23; compatible with standard 0.5 mm pitch reflow profiles. |
| High-temperature operation | Junction rating up to +150 °C supports placement near power components or in engine-compartment modules. |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Level-shifting and enable control for window motor drivers and lock actuators in door control units. IC Role / Device Role / Timing Role: PNP switch providing active-low enable path with rail-to-rail voltage tolerance and fast turn-off. Use Value: −30 V VCEO withstands load-dump transients; AEC-Q101 compliance ensures field reliability over 15-year vehicle life. |
Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges in PLC input modules. IC Role / Device Role / Timing Role: Linear-mode PNP amplifier stage with stable hFE across −40 °C to +85 °C operating range. Use Value: 125–800 hFE supports calibrated gain setting; low VCE(sat) minimizes self-heating error in precision measurement paths. |
| Consumer Power Management | Medical Diagnostic Equipment |
Use Scenario: Enabling/disabling auxiliary rails (e.g., USB-C VCONN or display backlight) in portable medical monitors. IC Role / Device Role / Timing Role: Low-current PNP pass switch with fast response (<1 µs rise/fall) and low standby leakage. Use Value: −100 nA ICBO at 25 °C reduces quiescent current; SOT323 size fits tight space constraints behind LCD bezels. |
Use Scenario: Isolating patient-connected analog front-end stages from digital control logic in ECG/EEG units. IC Role / Device Role / Timing Role: Signal-level PNP buffer preventing ground-loop coupling while maintaining signal integrity. Use Value: −5 V VEBO allows safe biasing in isolated domains; 625 K/W Rth(j-a) supports fanless thermal design. |
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 (same test condition), identical SOT323 package and pinout. | Higher VCEO supports wider supply range (e.g., 12 V automotive systems with ripple); same thermal and switching specs. | Select when system rail exceeds 30 V but layout and footprint must remain unchanged. |
| BC848W-Q | NPN complement; VCEO = −30 V, IC = −100 mA, hFE = 110–800; same SOT323 package but reversed polarity. | Used where active-high switching or NPN topology is required (e.g., high-side driver with level shift); not drop-in replaceable. | Choose only for complementary circuit design - not for direct functional substitution in PNP positions. |
Compared with BC857W-Q, BC858W-Q trades 15 V lower VCEO for tighter process control in 3.3 V/5 V domains; versus BC848W-Q, it provides true PNP functionality essential for active-low load control without added level-shifting circuitry.
Availability
BC858W-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal chains, and portable medical diagnostics requiring stable component supply and AEC-Q101 traceability.
Supply support for BC858W-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 BC858W-Q belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, designed specifically for cost-sensitive, space-constrained automotive and industrial signal switching and amplification roles.
FAQ
Is BC858W-Q pin-compatible with BC857W-Q and BC856W-Q?
Yes - all three share identical SOT323 (SC-70) package and pinout (1: Base, 2: Emitter, 3: Collector). Electrical differences lie in VCEO (−30 V, −45 V, −65 V) and hFE distribution, allowing direct PCB replacement where voltage headroom permits.
What is the maximum allowable power dissipation at 85 °C ambient?
At Tamb = 85 °C, derating begins at 25 °C: Ptot = 200 mW − [(85 − 25) × (200 mW / 625 K)] = 180.8 mW. This assumes standard FR4 mounting; actual value depends on copper area and airflow.
Does BC858W-Q support pulsed operation beyond 100 mA?
Yes - peak collector current ICM is rated at −200 mA for pulse widths ≤ 300 µs and duty cycle ≤ 2 %. This enables short-duration surge handling in motor commutation or LED strobing applications.
How does AEC-Q101 qualification impact manufacturing traceability?
AEC-Q101 qualification mandates lot-level traceability, extended reliability testing (HTOL, TC, UHAST), and controlled wafer fabrication. Each BC858W-Q reel carries full test reports and material declarations compliant with automotive PPAP requirements.
BC858W-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):
- 30 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
BC858W-QF FAQ
1.How can I place an order for BC858W-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC858W-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 BC858W-QF reliable?
The price and inventory of BC858W-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC858W-QF is usually 5 days.
3.What payment methods are accepted for BC858W-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC858W-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC858W-QF?
BC858W-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC858W-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 BC858W-QF?
For technical support, including BC858W-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC858W-QF requirements.
6.How does Aetrix verify that BC858W-QF is sourced from the original manufacturer or authorized distributors?
All BC858W-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 BC858W-QF meets industry standards.
7.What is the process for return or replacement of BC858W-QF?
All BC858W-QF units undergo pre-shipment inspection (PSI). If there is an issue with BC858W-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 BC858W-QF part is unused and in its original packaging.
Return procedure for BC858W-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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