STMicroelectronics L7820 20V 1A Positive Voltage Regulator
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Prices updated: 12 Oct 2026
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About this product
The L7820 is a three-terminal positive fixed voltage regulator with a 20 V output and up to 1 A output current. It provides local regulation with internal current limiting, thermal shut-down and safe area protection. It is suited to producing a 20 V rail from a higher unregulated input in hobby and bench projects.
Specifications
- Output voltage
- 20 V
- Output current
- 1 A
- Type
- Three-terminal fixed positive regulator
- Protection
- Thermal overload, short circuit, SOA
Frequently asked questions
What input voltage does the L7820 need?
The input must be higher than 20 V by the regulator's dropout margin, which is typically a few volts according to the datasheet. Use a higher unregulated input and check the datasheet for your load current.
Does the L7820 need a heatsink?
For loads approaching its 1 A maximum, yes. Provide adequate heat sinking and size it for the power dissipated, which is the difference between input and output voltage multiplied by the load current.
