component
L6981N33DR
Public Made by Adomby adom
STMicroelectronics DC-DC Converters, SO-8. 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
markdownL6981N33DR
STMicroelectronics · DC-DC Converters · SO-8
L6981N33DR from STMicroelectronics, in a SO-8. 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 | SW | output | Switching node that drives the external LC output filter; oscillates between near-VIN and near-GND at 360 to 440 KHz switching frequency. |
| 2 | BOOT | passive | Bootstrap capacitor connection; connect 100 nF capacitor between BOOT and SW to supply gate drive charge to internal high-side NMOS. |
| 3 | VCC | power_in | Power supply for internal analog circuitry; connect ceramic capacitor (≥ 1 µF) to AGND for filtering; regulated to 3.0 to 3.6 V. |
| 4 | VOUT/FB | output | Output voltage sensing pin; for N33DR variant this is VOUT with internal voltage divider set to 3.3 V fixed output. |
| 5 | EN/CLKIN | input | Enable control pin with rising threshold 1.08 to 1.32 V and falling threshold 1.0 V; also accepts external clock input (200 to 500 KHz) for synchronization in LNM mode. |
| 6 | AGND | power_in | Analog ground reference for internal signal processing and voltage sensing circuits. |
| 7 | VIN | power_in | DC input voltage pin with operating range 3.5 to 38 V; supplies power to internal switches and analog circuits. |
| 8 | PGND | power_in | Power ground connection for output power stage and switching circuits. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
L6981N33DR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
l6981n33dr-etched.step/l6981n33dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);l6981n33dr.step/l6981n33dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (52 pp, sha256
ffbb8bf9e87b0957, retrieved 2026-09-26, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).