# FM2541SD

**Shenzhen Fuman** · AC-DC Controllers & Regulators · SOP-8

FM2541SD from Shenzhen Fuman, in a SOP-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 | VCC | power_in | IC supply pin with start-up threshold 15-18V (16.5V typ), UVLO 8-10V, OVP 29-33V, and an absolute maximum of -0.3 to 30V. |
| 2 | FB | input | Feedback voltage sampling pin from the auxiliary winding divider, with a 2V typical reference (1.97-2.03V) and an absolute maximum of -40 to 8.5V. |
| 3 | GND | power_in | Chip ground. |
| 4 | CS | input | Primary peak-current sense pin with 500mV typical peak threshold in constant-current mode, 500ns leading-edge blanking, and an absolute maximum of -0.3 to 7V. |
| 5 | D | passive | Drain of the internal 650V, 4A power MOSFET, with Rds(on) 2.3 ohm max. |
| 6 | D | passive | Drain of the internal 650V, 4A power MOSFET, with Rds(on) 2.3 ohm max. |
| 7 | D | passive | Drain of the internal 650V, 4A power MOSFET, with Rds(on) 2.3 ohm max. |
| 8 | D | passive | Drain of the internal 650V, 4A power MOSFET, with Rds(on) 2.3 ohm max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Fuman |
| Package | SOP-8 |
| Category | Power Management ICs |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `FM2541SD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `fm2541sd-etched.step` / `fm2541sd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fm2541sd.step` / `fm2541sd.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Fuman datasheet](docs/fm2541sd-datasheet.pdf) (9 pp, sha256 `5dd312446c8299e1`, retrieved 2026-10-30, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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).

[Datasheet PDF](docs/fm2541sd-datasheet.pdf)