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L7908 Negative Voltage Regulator

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by Ray

Fixed -8 V negative-voltage linear regulator, up to 1.5 A, in the L79xx series.

regulatorlinearnegativefixedpmicstto-220
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Contents

README

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L7908

STMicroelectronics · Linear Regulator (LDO) · TO-220

The L7908 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -8 V output at up to 1.5 A with adequate heat sinking. It pairs with a positive 78xx regulator to build split (dual-rail) supplies, needing only input and output capacitors.

Pinout

Pin Name Type Function
1 GND power_in Common/ground return. For the L79 negative regulator family the ground pin is pin 1 on TO-220 / TO-220FP (this differs from the L78 positive-regulator pinout).
2 IN power_in Unregulated negative input voltage. Recommended operating range for the -8 V version is roughly -11 V to -23 V (V_I max abs = -35 V). A 2.2 µF bypass capacitor to GND is required close to this pin.
3 OUT power_out Regulated -8 V output, up to 1.5 A with adequate heat sinking. Typical dropout 1.1 V at 1 A. A 1 µF output capacitor to GND is required for loop stability.

Key specifications

Parameter Value
Type Fixed negative linear regulator
Output voltage -8 V
Output current Up to 1.5 A (with heatsink)
Line/load regulation Internally set
Package TO-220 (3-lead)
Operating temperature 0 C to 125 C (junction)

Ordering variants

Same part, different packaging or reel option.

  • L7908CV
  • L7908ACV
  • L7908CP
  • L7908ACP
  • L7908CD2T
  • L7908ACD2T

CAD (KiCad official)

  • Symbol: l7908.kicad_sym
  • Footprint: l7908.kicad_mod
  • 3D model: TO-220 body from KiCad Package_TO_SOT_THT/TO-220-3_Vertical.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (29 pp, sha256 6bdb1e0a1c61a10d, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF