CNCHIPDEPOT Original Part
BC857B
BC857B PNP BJT transistor with 45V VCEO, 100mA collector current, 100MHz fT and SOT-23 package.
Transistor PolarityPNP
Collector-Emitter Voltage (VCEO)45 V
Collector Current (IC)100 mA
DC Current Gain (hFE)220 Min @ IC = -2 mA, VCE = -5 V
Power Dissipation (PD)200 mW
PackageSOT-23
Product Overview
The BC857B is a PNP bipolar junction transistor designed for general-purpose small-signal amplification and low-current switching. It features a 45V collector-emitter voltage rating, 100mA maximum collector current, and a minimum DC current gain of 220 at 2mA collector current. Its gain characteristics and 100MHz transition frequency make it suitable for compact analog, interface, and control circuits.
Packaged in a SOT-23 surface-mount package, the BC857B is well suited to space-constrained PCB designs. It can be used in PNP high-side switching, signal amplification, complementary transistor stages, buffering, and low-power control applications.
Specifications
Key electrical, package, and sourcing parameters for quick engineering review.
| Part Number | BC857B |
| Brand | CNCHIPDEPOT |
| Package | SOT-23 |
| Product Type | BJT |
| Transistor Polarity | PNP |
| Collector-Emitter Voltage (VCEO) | 45 V |
| Collector Current (IC) | 100 mA |
| DC Current Gain (hFE) | 220 Min @ IC = -2 mA, VCE = -5 V |
| Power Dissipation (PD) | 200 mW |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 0.5 V Max (Magnitude) @ IC = -100 mA, IB = -5 mA |
| Transition Frequency (fT) | 100 MHz |
| Junction Temperature (TJ) | 150°C Max |
| Mounting Type | Surface Mount |
| Package / Case | TO-236-3 / SC-59 / SOT-23-3 |
| Collector Cutoff Current | 100 nA Max |
Cross Reference & Replacement Information
The following part numbers are commonly reviewed for replacement or compatibility matching. Always verify datasheet, package, pinout, and operating conditions before bulk purchase.
| Target Brand | Target MPN | Replace Type | Notes |
|---|---|---|---|
| Rohm Semiconductor | 2SC2412K | Functional Replacement | Similar PNP BJT characteristics; check voltage and current ratings. |
| NXP Semiconductors | BC857B | Identical Part | Same MPN from original manufacturer. |
| STMicroelectronics | BC857B | Cross Reference | Check package and electrical parameters for consistency. |
| ON Semiconductor | BC857B | Compatible Alternative | Verify datasheet specifications before use. |
Datasheet
Download the datasheet or contact us for additional technical information.
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Typical Applications
- General-purpose PNP signal amplification
- Low-current high-side switching circuits
- Complementary NPN/PNP transistor stages
- Analog signal buffer circuits
- Low-power interface and control circuits
- Compact surface-mount electronics
Ordering & RFQ Information
- MOQ: Contact sales
- Lead Time: 3–7 working days for stock items
- Packaging: Reel / Tube / Tray depending on package
- Sample Availability: Available on request
- Mass Production Status: 50K+ pcs Stock / Mass Production
FAQ
Can this part replace my current model?
It may be suitable depending on your circuit requirements. Please verify datasheet, package, pinout, and test samples before bulk orders.
Can I request samples?
Yes. Please submit your RFQ with target quantity and application details.
Need this part or a compatible replacement?
Send us your target part number, BOM list, quantity, and technical requirements. CNCHIPDEPOT can help review replacement options and provide RFQ support.
Submit RFQElectronic Component Manufacturing & Quality Control
As a China electronic component factory , China Chip Depot supports component sourcing, production, testing and quality inspection for global B2B buyers. We also provide Cross Reference Alternative Parts matching services to help engineers and procurement teams identify suitable component alternatives.
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Quality Inspection Lab
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SMT Assembly Workshop
SMT production and assembly capabilities supporting electronic component and PCB-related manufacturing requirements.
Semiconductor Production
Controlled production environments supporting semiconductor and electronic component manufacturing processes.
Component Testing Equipment
Electrical testing and verification equipment used to support performance checks and product consistency.
Quality Inspection Lab
Quality inspection processes help verify component condition, specifications and production consistency before shipment.