BC817-16W

Updated: 2026-07-23

Overview

The BC817-16W is a surface-mount NPN bipolar junction transistor in the SOT-23 package, part of the BC817 series that includes multiple hFE grading options. Developed as a general-purpose switching and amplification device, it finds widespread use in modern electronics due to its compact size and reliable performance. As part of the BC817 family, the -16W suffix indicates a DC current gain (hFE) range of 100-250 at 2mA collector current. This makes it particularly suitable for applications requiring moderate gain consistency. The transistor is manufactured by multiple semiconductor companies, ensuring broad availability.

Structure and Working Principle

BC817-16W 贴片三极管 NPN型双极晶体管 45V SOT-323 扬杰代理

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The BC817-16W follows standard NPN transistor construction with emitter, base, and collector terminals in the SOT-23 package configuration. The silicon-based design provides good thermal stability and switching characteristics. When a small current flows into the base terminal (relative to emitter), it controls a larger current flow between collector and emitter. This current amplification property makes it useful for both analog signal amplification and digital switching applications. The device operates in three states: cutoff (off), active (amplifying), and saturation (fully on).

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Key Features

With a collector current rating of 500mA and collector-emitter voltage of 45V, the BC817-16W handles moderate power levels while maintaining small form factor. The SOT-23 package measures approximately 2.9 × 1.3 × 0.95mm, making it ideal for space-constrained designs. The transistor offers a typical transition frequency of 100MHz, suitable for many RF applications. Low saturation voltage (VCE(sat) typically 0.7V at 500mA) improves efficiency in switching circuits. The -16W version provides consistent gain across production batches, important for circuit stability.

Application Areas

Common applications include signal amplification in audio circuits, driver stages for LEDs or relays, and interface circuits in microcontroller systems. The BC817-16W frequently appears in consumer electronics like smartphones, tablets, and IoT devices. In industrial settings, it's used for sensor interfaces and control logic. Automotive applications include non-critical subsystems where its temperature range (-55°C to +150°C) meets requirements. The device is also popular in hobbyist electronics due to its versatility and availability.

Maintenance and Precautions

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While generally robust, the BC817-16W requires proper handling during assembly. Soldering should follow SMD reflow profiles with peak temperature not exceeding 260°C. Manual soldering with irons should be brief to prevent thermal damage. In circuit design, ensure base current limiting to prevent overdrive, and consider heat dissipation in continuous operation near maximum ratings. ESD precautions are necessary during handling. Always verify pinout (Emitter-Base-Collector varies by manufacturer) before installation.

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B2B Procurement Guide

When sourcing BC817-16W transistors, buyers should consider several factors. Verify manufacturer authenticity - common sources include NXP, ON Semiconductor, and Diodes Inc. Minimum order quantities typically range from 3,000 to 10,000 pieces for competitive pricing. Lead times vary from stock availability to 8-12 weeks. Packaging options include tape-and-reel (standard 3,000 units per reel) or cut tape. For quality assurance, request manufacturer certificates and consider batch testing for critical applications. Alternative equivalents may be available but require careful parameter comparison.