component
LD3985M27R
Public Made by Adomby adom
STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLD3985M27R
STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L
LD3985M27R from STMicroelectronics, in a SOT-23-5L. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VI | power_in | Input voltage of the LDO, operating from 2.5 V to 6 V, with absolute maximum DC input of -0.3 V to 6 V. |
| 2 | GND | power_in | Common ground pin for the regulator. |
| 3 | VINH | input | Inhibit input: ON mode when VINH is at or above 1.2 V, OFF mode when VINH is at or below 0.4 V, and it must not be left floating because it is not internally pulled down or up. |
| 4 | BYPASS | passive | Bypass pin where an external capacitor, usually 10 nF, must be connected to minimize output noise voltage. |
| 5 | VO | power_out | Regulated output voltage of the LDO; for the LD3985M27R this is the 2.7 V version, delivering up to 150 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-23-5L |
| Category | Power Management (PMIC) |
| Pins | 5 |
CAD (KiCad official)
- Symbol:
LD3985M27R - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files:
ld3985m27r-etched.step/ld3985m27r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ld3985m27r.step/ld3985m27r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (19 pp, sha256
d909f94a6b4df434, retrieved 2026-10-11, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).