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Nexperia USA Inc. BC857B-QVL
- Part No.:
- BC857B-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC857B-QVL.pdf
- Description:
- TRANS PNP 45V 0.1A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,168
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Product details
Overview
BC857B-QVL from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 220–475 at VCE = −5 V and IC = −2 mA. It serves as a low-voltage switching or linear amplification device in automotive signal conditioning and power management circuits.
For engineers reviewing the BC857B-QVL datasheet, BC857B-QVL pinout, BC857B-QVL application, or BC857B-QVL equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (Rth(j-a) = 500 K/W), saturation voltage (VCE(sat) ≤ −650 mV at IC = −100 mA), and exact pin mapping - all critical for automotive-grade PCB layout and reliability validation.
Technical Context
This PNP transistor operates with emitter-base breakdown voltage (V(BR)EBO) of −5 V and collector-base breakdown voltage (V(BR)CBO) of −50 V, supporting robust operation under reverse-biased conditions in sensor interface and load-switching topologies. Its fT of 100 MHz enables stable performance up to audio-frequency amplification and fast digital switching.
Thermal design is constrained by a maximum junction temperature of 150 °C and total power dissipation of 250 mW at Tamb ≤ 25 °C on FR4 PCB. The device exhibits low noise figure (2–10 dB at IC = −200 µA), making it suitable for low-level analog signal stages where gain stability and minimal added noise are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum allowable collector-emitter voltage before breakdown; defines safe operating range in automotive 12 V/24 V supply rails. |
| IC | −100 mA: Continuous collector current rating; supports medium-current switching of LEDs, relays, and small solenoids. |
| hFE | 220–475 at VCE = −5 V, IC = −2 mA: Predictable DC current gain band enabling reliable bias network design without excessive margin. |
| VCE(sat) | ≤ −650 mV at IC = −100 mA, IB = −5 mA: Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switch applications. |
| Rth(j-a) | 500 K/W: Thermal resistance from junction to ambient on standard FR4 PCB; informs heatsinking requirements and derating curves. |
| fT | 100 MHz: Transition frequency confirms usable bandwidth for audio preamplifiers and PWM gate drivers up to ~10 MHz. |
| AEC-Q101 | Qualified: Meets stress-test requirements for automotive discrete semiconductors, including temperature cycling, HTRB, and ESD. |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, 0.45 mm lead pitch, and 0.9 mm height - optimized for automated placement and reflow soldering on space-constrained automotive control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit base drive and ensure predictable hFE-based current amplification. |
| 2 | Emitter (E) | Common terminal for PNP configuration; connected to higher potential rail (e.g., battery +12 V) in high-side switch layouts. |
| 3 | Collector (C) | Output current path; sinks load current to ground or lower-potential node when base is forward-biased relative to emitter. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress-test requirements - eliminates need for customer-level qualification testing in Tier-1 modules. |
| Low VCE(sat) | −650 mV max at full rated current ensures <13 mW conduction loss, reducing thermal load in sealed enclosures. |
| Controlled hFE spread | 220–475 range enables consistent gain matching across production lots for analog feedback loops and current mirrors. |
| −5 V V(BR)EBO | Enables safe operation with microcontroller GPIOs (3.3 V/5 V) driving base through resistive divider without external clamping. |
| 500 K/W Rth(j-a) | Allows direct thermal modeling on standard 35 µm copper FR4 boards - no thermal pad or via array required for ≤100 mA continuous loads. |
Applications
| Automotive Door Module Switching | Engine Control Unit Signal Conditioning |
|---|---|
|
Use Scenario: Driving window lift motor enable lines and door lock actuator coils in body control modules. IC Role / Device Role / Timing Role: High-side PNP switch controlling 12 V loads with logic-level base drive from MCU GPIO. Use Value: −650 mV VCE(sat) limits power loss to <13 mW at 20 mA base drive, preventing thermal runaway in sealed plastic housings. |
Use Scenario: Level-shifting and amplifying oxygen sensor output signals before ADC sampling in engine management systems. IC Role / Device Role / Timing Role: Linear amplifier stage with fixed bias network providing 20–30 dB gain for millivolt-range analog inputs. Use Value: 2–10 dB noise figure preserves SNR in low-amplitude sensor signals, avoiding degradation of air-fuel ratio calculation accuracy. |
| LED Headlamp Dimming Circuit | Industrial PLC Input Isolation |
|
Use Scenario: PWM-controlled current sink for position lamp and DRL LED strings in adaptive lighting systems. IC Role / Device Role / Timing Role: Fast-switching PNP transistor operating in saturation/cutoff mode at 1–10 kHz PWM frequencies. Use Value: 100 MHz fT ensures clean switching edges with <100 ns rise/fall times, eliminating visible flicker and EMI spikes. |
Use Scenario: Optocoupler input stage translating 24 V industrial field signals to 3.3 V logic levels for microcontroller safety monitoring. IC Role / Device Role / Timing Role: Current-limiting interface transistor protecting optocoupler LED from overcurrent during transient surges. Use Value: −45 V VCEO withstands common-mode transients up to ±40 V, meeting IEC 61000-4-4 level 3 surge immunity requirements. |
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 |
|---|---|---|---|
| BC857B,115 (Nexperia) | No Q-grade suffix; not AEC-Q101 qualified; identical electrical specs and SOT23 package. | Restricted to non-automotive industrial or consumer use due to missing automotive qualification. | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs long-term reliability assurance. |
| MMBT3906LT1G (ON Semiconductor) | VCEO = −40 V (5 V lower); hFE = 100–300 (narrower, lower gain band); same SOT23 package. | Marginally lower voltage headroom may require redesign in 24 V systems; reduced gain necessitates larger base drive. | Acceptable for cost-driven consumer designs but not recommended for automotive 12 V/24 V systems requiring headroom and gain consistency. |
Compared with BC857B-QVL, BC857B,115 lacks automotive qualification despite identical electrical behavior, while MMBT3906LT1G trades voltage margin and gain stability for broader commercial availability - making BC857B-QVL the sole choice for AEC-Q101–mandated automotive signal switching where VCEO ≥ −45 V and hFE ≥ 220 are design-critical.
Availability
BC857B-QVL is available at Aetrix Electronics and suitable for automotive body electronics, engine control units, and industrial programmable logic controllers requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BC857B-QVL 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 technologies.
The BC857-Q series belongs to Nexperia's AEC-Q101–qualified general-purpose transistor product line, engineered specifically for robust, cost-effective switching and amplification in harsh automotive environments.
FAQ
Is BC857B-QVL pin-compatible with BC847B?
Yes - BC857B-QVL (PNP) and BC847B (NPN) share identical SOT23 pinout (1=Base, 2=Emitter, 3=Collector), enabling direct board-level substitution in complementary circuit designs. However, polarity reversal must be accounted for in bias networks and load connections to avoid functional failure.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current (IBM) is −200 mA, but for continuous DC operation, base current must be limited to maintain junction temperature ≤150 °C. At IC = −100 mA and hFE = 220, typical IB is −455 µA; design practice limits IB to ≤−5 mA to ensure saturation without overstressing the base-emitter junction.
Does BC857B-QVL support wave soldering?
Yes - Nexperia specifies wave soldering profiles for SOT23 packages per Figure 16 in the datasheet, with recommended solder land dimensions of 2.8 mm × 1.4 mm and transport direction aligned with pin 1–3 axis. Preheating to 100–150 °C and contact time ≤5 seconds prevent thermal damage to the die and molding compound.
How does the Q-grade marking differ from standard BC857B?
The "Q" suffix denotes AEC-Q101 qualification, including extended temperature cycling (−55 °C to +150 °C), high-temperature reverse bias (HTRB), and electrostatic discharge (ESD) testing per JS-001. Standard BC857B lacks this test documentation and is not approved for automotive safety-critical or mission-critical functions.
BC857B-QVL 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:
- 220 @ 2mA, 5V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BC857B-QVL FAQ
1.How can I place an order for BC857B-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857B-QVL 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 BC857B-QVL reliable?
The price and inventory of BC857B-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857B-QVL is usually 5 days.
3.What payment methods are accepted for BC857B-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857B-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857B-QVL?
BC857B-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857B-QVL 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 BC857B-QVL?
For technical support, including BC857B-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857B-QVL requirements.
6.How does Aetrix verify that BC857B-QVL is sourced from the original manufacturer or authorized distributors?
All BC857B-QVL 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 BC857B-QVL meets industry standards.
7.What is the process for return or replacement of BC857B-QVL?
All BC857B-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BC857B-QVL, 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 BC857B-QVL part is unused and in its original packaging.
Return procedure for BC857B-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857B-QVL Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
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MMBT2222A-7-F
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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