7805 Linear 5V Regulator (TO-220)
by ST / UTC
SKU: PSA-CMP-7805
No reviews yetTypical India street price
₹8–₹25
Drop a 9 V battery to a clean 5 V rail for small circuits.
Interface: 3-pin analog regulator
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Concept
A linear regulator burns the extra voltage as heat: P = (Vin−5)×I.
A little theory
Needs ~2 V headroom. 0.33 µF in, 0.1 µF out typical. Thermal shutdown exists but heatsinks matter. In the classroom, treat 7805 Linear 5V Regulator (TO-220) as a beginner part using 3-pin analog regulator. Typical India street price is about ₹8–₹25. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Pinout (TO-220 front): IN, GND, OUT. Heat sink if I > 200 mA.
Classroom & project use
- 9 V → 5 V breadboard
- Wall-wart cleanup
- Power Supply classroom demo
Buying in India
Precautions
- Heat
- Don’t reverse IN/OUT
- Input must be higher than 5 V + dropout
Specifications
| Vout | 5V |
| Package | TO-220 |
| Category | Power Supply |
| Difficulty | Beginner |
| Voltage | Vin 7–12 V typical → 5 V |
| Interface | 3-pin analog regulator |
Pinout
VCC | GND | AO (and DO if comparator module)
