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Learn the essential features and specifications of the BC547B NPN transistor. Understand datasheet ratings, typical applications, and how to source them in South Africa at Communica.
Understand voltage, current, gain, and package details for quick reference.
Get tips on circuit integration and troubleshooting common issues.
Find out how to source BC547B locally with lead time considerations.
The BC547B is a widely used general-purpose NPN bipolar junction transistor (BJT), particularly popular for switching and low-level amplification in hobby, educational, and light industrial circuits. It's affordable, reliable, and a staple in South African curricula, kits, and engineering labs. This guide details the BC547B's characteristics, datasheet specs, example calculations, and real-world selection factors for makers and buyers sourcing locally at Communica.
| Parameter | Typical Value | Notes |
|---|---|---|
| Type/Polarity | NPN | Bipolar Junction |
| Package | TO-92 | Leads: Emitter, Base, Collector |
| Maximum Collector-Emitter Voltage (VCEO) | 45 V | For medium voltage tasks |
| Collector Current (IC max) | 100 mA | Peak continuous rating |
| hFE (DC Current Gain) | 200 - 450 | BC547B bin (B = mid-gain range) |
| Maximum Power Dissipation | 500 mW | @ Ta = 25°C; derate above |
| Transition Frequency (fT) | 150 MHz | For small-signal amplification |
| Pinout (flat edge facing you) | 1: Emitter, 2: Base, 3: Collector | Standard TO-92 layout |
Always select a transistor with voltage and current specs above your application's peak needs. The BC547B can comfortably switch or amplify signals up to 100 mA at voltages below 45 V. Exceeding these limits-even momentarily-may cause failure or degrade performance, especially with repeated surges or high ambient temperatures.
| Part Number | hFE Range | VCEO (V) | IC (max, mA) |
|---|---|---|---|
| BC547 | 110 - 800 (A/B/C) | 45 | 100 |
| BC547B | 200 - 450 (B bin) | 45 | 100 |
| BC548 | 110 - 800 (A/B/C) | 30 | 100 |
When buying for school projects or industrial kits, always specify the gain bin required (A/B/C) as needed for your circuit's biasing. Most South African grades use BC547B (mid-gain) by default in formularies.
Let's calculate the base resistor needed for switching a 12V relay drawing 70 mA through a BC547B (hFE ~ 300 assumed, VBE ~ 0.7 V):
Communica offers BC547B transistors from a range of global manufacturers with ZAR VAT invoicing, branch collection at Samrand, and delivery across South Africa. Bulk pack sizes cater to both individual and institutional buyers. Always request a datasheet for the exact part code as specifications may slightly vary by brand. Lead time is generally immediate for stocked lines but can extend 2-10 days for imported reels or tape.
| Application | Typical Circuit Voltage | Pack Size Needed |
|---|---|---|
| Breadboard Prototyping | 5V, 12V | Single, 10-pack |
| Student Lab/Kit | 9V, 12V | 25-100-pack |
| Industrial Test Rigs | 24V | Bulk/bag |
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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