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Passive Components
Intermediate
Grades 9-10
5V logic
BC547 NPN Transistor (pack)
by Generic
SKU: PSA-CMP-BC547
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₹10–₹30
Not currently sold by PSA — learn about the part below
Small-signal NPN for switching LEDs, buzzers, and teaching β.
Interface: TO-92
Voltage: 45V Vceo
Library reference — not in PSA stock yet
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Concept
Tiny current into base controls larger collector current.
A little theory
Ic ≈ β Ib. Use a base resistor (1–10 kΩ). Low-side switch: emitter to GND, load to collector.
How it works in a project
Pinout E-B-C (confirm datasheet — some C-B-E).
Classroom & project use
- LED from a pin
- Buzzer amp
- Logic invert
Buying in India
BC547/BC548/2N2222 interchangeable for school switching.
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Type | NPN |
| Package | TO-92 |
| Category | Passive Components |
| Difficulty | Intermediate |
| Voltage | 45V Vceo |
| Interface | TO-92 |
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