STMicroelectronics L7918CV -18V 1A Negative Voltage Regulator TO-220
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Prices updated: 13 Oct 2026
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About this product
The L7918CV is a three-terminal fixed negative voltage regulator with a -18 V output and up to 1 A output current when adequately heat-sunk. It is available in TO-220, TO-220FP and D2PAK packages. It includes thermal overload, short-circuit and safe operating area protection and is commonly used for the negative rail in split supplies.
Specifications
- Output voltage
- -18 V
- Output current
- 1 A (with adequate heatsinking)
- Type
- Three-terminal fixed negative regulator
- Packages
- TO-220, TO-220FP, D2PAK
- Protection
- Thermal overload, short circuit, SOA
Frequently asked questions
How should the L7918CV be wired?
It has three terminals: unregulated negative input, common ground, and regulated -18 V output. Confirm the pin order for your package in the datasheet, and keep the input more negative than -18 V by the regulator's required margin.
Does the L7918CV need a heatsink?
At currents approaching 1 A, a heatsink is needed. The regulator delivers its full output current only with adequate heat sinking, so size the heatsink for the power it dissipates.
