CNCHIPDEPOT Original Part
BC817-40
BC817-40 NPN BJT transistor with 45V VCEO, 500mA collector current, hFE 250–600 and SOT-23 package.
Transistor PolarityNPN
Collector-Emitter Voltage (VCEO)45 V
Collector Current (IC)500 mA
DC Current Gain (hFE)250–600
Power Dissipation (PD)300 mW
PackageSOT-23
Product Overview
The BC817-40 is an NPN bipolar junction transistor designed for general-purpose switching and amplification with higher current capability than typical small-signal BJTs. It features a 45V collector-emitter voltage rating, 500mA maximum collector current, and a defined DC current gain range of 250–600. The -40 gain grade provides relatively high gain, making it suitable for low-voltage driver, interface, and control circuits.
Packaged in a compact SOT-23 surface-mount package, the BC817-40 combines moderate current handling with a small PCB footprint. It is suitable for LED driving, low-current relay control, signal amplification, and general-purpose transistor switching applications.
Specifications
Key electrical, package, and sourcing parameters for quick engineering review.
| Part Number | BC817-40 |
| Brand | CNCHIPDEPOT |
| Package | SOT-23 |
| Product Type | BJT |
| Transistor Polarity | NPN |
| Collector-Emitter Voltage (VCEO) | 45 V |
| Collector Current (IC) | 500 mA |
| DC Current Gain (hFE) | 250–600 |
| Power Dissipation (PD) | 300 mW |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 0.7 V Max |
| Transition Frequency (fT) | 100 MHz |
| Junction Temperature (TJ) | 150°C Max |
| Mounting Type | Surface Mount |
| Marking Code | 6C |
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 | 2SC3356 | Functional Alternative | Similar NPN BJT characteristics, confirm pinout and package. |
| NXP Semiconductors | BC817-40 | Direct Replacement | Same part number from original manufacturer. |
| STMicroelectronics | BC817-40 | Possible Replacement | Verify datasheet specifications before use. |
| ON Semiconductor | BC817-40LT1G | Cross Reference | Check package and electrical parameters for compatibility. |
Datasheet
Download the datasheet or contact us for additional technical information.
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Typical Applications
- General-purpose NPN switching circuits
- Low-voltage load driver stages
- LED and indicator driver circuits
- Small relay control circuits
- General-purpose signal amplification
- Compact surface-mount control circuits
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.
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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.