# RF101LAM4STR

**ROHM Semicon** · Diodes - Fast Recovery Rectifiers · SOD-128

RF101LAM4STR 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 terminal of the super fast recovery diode (pin (1) in the PMDTM outline drawing); VRM/VR rated 400V, average forward current 1A. |
| 2 | A | passive | Anode terminal of the super fast recovery diode (pin (2) in the PMDTM outline drawing); forward voltage 1.25V max at IF=1A. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Forward voltage | VF | 0.8 | 1 | 1.25 | V | IF=1A | 1 |
| Reverse current | IR |  |  | 10 | mA | VR=400V | 1 |
| Reverse recovery time | trr |  | 20 | 25 | ns | IF=0.5A, IR=1A, Irr=0.25×IR | 1 |
| Thermal resistance junction to lead | Rth(j-l) |  |  | 25 | °C/W | Junction to lead | 1 |
| Repetitive peak reverse voltage | VRM |  |  | 400 | V |  | 1 |
| Reverse voltage (direct) | VR |  |  | 400 | V | Direct reverse voltage | 1 |
| Average forward rectified current | Io |  |  | 1 | A | Glass epoxy board mounted, 60Hz half sin wave, resistive load, Tl=115°C | 1 |
| Non-repetitive forward surge current | IFSM |  |  | 25 | A | 60Hz half sin wave, non-repetitive at Tj=25ºC | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `RF101LAM4STR`
- Footprint: `Diode_SMD:D_SOD-128`
- 3D model: SOD-128 (KiCad packages3D, STEP)
- 3D model files: `rf101lam4str-etched.step` / `rf101lam4str-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rf101lam4str.step` / `rf101lam4str.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/rf101lam4str-datasheet.pdf) (6 pp, sha256 `c2070a6a1d2d346a`, retrieved 2026-10-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/rf101lam4str-datasheet.pdf)