# RB508FM-40FHT106

**ROHM Semicon** · Schottky Barrier Diodes (SBD) · SOT-323

RB508FM-40FHT106 from ROHM Semicon, in a SOT-323. 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 | A | passive | Anode of the Schottky diode (VR 40 V, Io 80 mA, IFSM 1 A). |
| 2 | N/C | unconnected | No internal connection. |
| 3 | K | passive | Cathode of the Schottky diode (VR 40 V, Io 80 mA, IFSM 1 A). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOT-323 |
| 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 1 | VF1 |  | 0.51 | 0.59 | V | IF=1mA, Tj=-40℃ | 2 |
| Forward voltage 2 | VF2 |  | 0.56 | 0.62 | V | IF=10mA, Tj=-40℃ | 2 |
| Forward voltage 3 | VF3 |  | 0.61 | 0.66 | V | IF=40mA, Tj=-40℃ | 2 |
| Forward voltage 4 | VF4 |  | 0.4 | 0.48 | V | IF=1mA, Tj=25℃ | 2 |
| Forward voltage 5 | VF5 |  | 0.47 | 0.53 | V | IF=10mA, Tj=25℃ | 2 |
| Forward voltage 6 | VF6 |  | 0.54 | 0.59 | V | IF=40mA, Tj=25℃ | 2 |
| Reverse current 1 | IR1 |  | 2 | 35 | nA | VR=30V, Tj=25℃ | 2 |
| Reverse current 2 | IR2 |  | 15 | 260 | μA | VR=30V, Tj=150℃ | 2 |
| Reverse current 3 | IR3 |  | 20 | 340 | μA | VR=40V, Tj=150℃ | 2 |
| Repetitive peak reverse voltage | VRM |  |  | 40 | V | Duty≦0.5 | 1 |
| Reverse voltage | VR |  |  | 40 | V | Direct reverse voltage | 1 |
| Forward current | IF |  |  | 120 | mA | Direct reverse voltage, per diode | 1 |
| Average rectified forward current | Io |  |  | 80 | mA | Glass epoxy mounted, 60Hz half sin waveform, resistive load, per diode | 1 |
| Peak forward surge current | IFSM |  |  | 1 | A | 60Hz half sin waveform, Non-repetitive, one cycle, Ta=25℃ | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `RB508FM-40FHT106`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `rb508fm-40fht106-etched.step` / `rb508fm-40fht106-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rb508fm-40fht106.step` / `rb508fm-40fht106.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/rb508fm-40fht106-datasheet.pdf) (7 pp, sha256 `c7732cfb393fd14a`, retrieved 2026-10-24, 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/rb508fm-40fht106-datasheet.pdf)