# RR1LAM4STFTR

**ROHM Semicon** · Fast Recovery / High Efficiency Diodes · SOD-128

RR1LAM4STFTR from ROHM Semicon, in a SOD-128. 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 | K | passive | Cathode (pin (2) in the datasheet outline is marked Anode, pin (1) Cathode per the package drawing); rectifier with VRM 500 V, VR 400 V, Io 1 A. |
| 2 | A | passive | Anode of the rectifying diode; forward voltage 1.1 V max at IF=1A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOD-128 |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `RR1LAM4STFTR`
- Footprint: `Diode_SMD:D_SOD-128`
- 3D model: SOD-128 (KiCad packages3D, STEP)
- 3D model files: `rr1lam4stftr-etched.step` / `rr1lam4stftr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rr1lam4stftr.step` / `rr1lam4stftr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589916330134056960) (7 pp, sha256 `10e04eee138c6eeb`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/rr1lam4stftr-datasheet.pdf)