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Get a deep dive into BC807-40 PNP transistor specs, applications, pinout, calculations, and sourcing advice for South African electronics projects.
Explore voltage, current, and gain specs vital for project reliability.
See wiring and circuit uses tailored to student, maker, and prototyping needs.
Find reliable stock, popular brands, and SA-relevant purchase considerations.
The BC807-40 is a widely used PNP bipolar junction transistor (BJT) designed for general-purpose switching and amplification in low power electronic circuits. Its popularity among hobbyists and students comes from its compact SOT-23 package, affordability, and availability from trusted suppliers like Communica within the South African market. Typical applications include signal amplification, logic level shifting, small relay driving, and low-power switching in microcontroller and breadboard projects.
Understanding the vital electrical parameters of the BC807-40 is important for safe circuit design and optimal performance. Here's a summary of the most relevant characteristics for hobbyist and educational use:
| Parameter | Typical Value | Notes |
|---|---|---|
| Transistor Type | PNP | SOT-23 (surface-mount), complements BC817 (NPN) |
| Collector-Emitter Voltage (VCE) | -45V | Max reverse voltage between collector and emitter |
| Continuous Collector Current (IC) | -500mA | Up to 0.5A in small-signal switching role |
| DC Gain (hFE) | 250-630 | "40" marks highest gain/beta bin |
| Total Power Dissipation (Ptot) | 310mW (at 25 degreesC) | Derates with ambient temp; see datasheet |
| Package | SOT-23 | Surface-mount, 3-pin outline |
The SOT-23 footprint is small, making it suited for compact PCBs or SMD prototyping boards accessible at many South African educational institutions. Always check for the correct orientation before soldering or breadboarding.
When picking the BC807-40, evaluate the following key factors:
To design with the BC807-40, calculate base resistor values to ensure full switching:
+5V | [Relay] | Collector | BC807-40 (SOT-23) | Emitter | Ground Base --[R_B]-- GPIO Output (Active LOW)
This arrangement allows a microcontroller GPIO (logic LOW) to energise a relay or indicator using minimal current, thanks to the BC807-40's high gain. Always include a flyback diode across relay coils for protection.
Communica offers the BC807-40 and related BJT product lines from top manufacturers-stock is visible per branch, and most variants include datasheets for selection. For larger project rollouts or tertiary needs, request bulk packs or search by vendor (ON Semi, Nexperia, Diodes Inc) via Sensors & Semiconductors or the Shop by Brand interface.
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