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sed5120

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by Ray

Seaward Elec Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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SED5120

Seaward Elec · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-3

SED5120 from Seaward Elec, in a SOT-223-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 IN power_in Input supply voltage. Absolute maximum 6V; recommended operating range up to 5.5V. Requires a minimum 10μF ceramic or tantalum input capacitor for stability.
2 GND power_in Ground reference for the regulator. Also serves as the thermal path via the SOT-223 tab. Ultra-low ground current of ~150μA typical.
3 OUT power_out Regulated output voltage (fixed 0.8V-3.9V option set by ordering suffix XX). Delivers up to 1.5A with current-limit at ~2.5A typical. Requires a minimum 10μF output capacitor placed within 1 cm of the pin, between OUT and GND.

Key specifications

Parameter Value
Manufacturer Seaward Elec
Package SOT-223-3
Category PMIC
Pins 3

Ordering variants

  • SED5120SGxx-HF
  • SED5120SE5120SGxx-HF
  • SED5120SE5120STxx-HF
  • SED5120SE5120JTxx-HF
  • SED5120SE5120JGxx-HF

CAD (KiCad official)

  • Symbol: SED5120
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223-3 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Seaward Elec datasheet (None pp, sha256 55f6acfdb0ee077b, retrieved 2026-08-17, tier: lcsc)
  • 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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