# RR601BM4STL

**ROHM Semicon** · Diodes - General Purpose · TO-252

RR601BM4STL from ROHM Semicon, in a TO-252. 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 | NC | unconnected | Open pin with no internal connection, as shown in the Structure diagram. |
| 2 | K | passive | Cathode, connected to the mounting tab (marked (2) in the outline); the part is rated 400 V VRM/VR, 6 A average rectified current at Tc=98°C. |
| 3 | A | passive | Anode terminal of the rectifier diode, with forward voltage 1.1 V max at IF=6A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | TO-252 |
| Category | Diodes |
| Pins | 3 |

## 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 |  | 0.98 | 1.1 | V | IF=6A | 1 |
| Reverse current | IR |  | 0.05 | 10 | A | VR=400V | 1 |
| Thermal resistance junction to case | Rth(j-c) |  |  | 6 | °C / W | Junction to case | 1 |
| Repetitive peak reverse voltage | VRM |  |  | 400 | V | Tc=25°C | 1 |
| Reverse voltage (direct) | VR |  |  | 400 | V | Tc=25°C, Direct reverse voltage | 1 |
| Average rectified forward current | Io |  |  | 6 | A | Tc=98°C, 60Hz half sin wave, Resistive load | 1 |
| Forward current surge peak | IFSM |  |  | 40 | A | 60Hz half sin wave, Non-repetitive at Tj=25°C | 1 |
| Operating junction temperature | Tj |  |  | 150 | °C | Tc=25°C | 1 |
| Storage temperature | Tstg | -55 |  | 150 | °C | Tc=25°C | 1 |

## CAD (KiCad official)

- Symbol: `RR601BM4STL`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `rr601bm4stl-etched.step` / `rr601bm4stl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rr601bm4stl.step` / `rr601bm4stl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/rr601bm4stl-datasheet.pdf) (7 pp, sha256 `4f62d040e94d195d`, retrieved 2026-10-23, tier: manufacturer)
- **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/rr601bm4stl-datasheet.pdf)