# RB751V-40-HF

**Comchip** · Zener Diodes · SOD-323

RB751V-40-HF from Comchip, in a SOD-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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Comchip |
| Package | SOD-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak reverse voltage | VRM |  |  | 40 | V |  | 1 |
| Mean rectifying current | IO |  |  | 30 | mA |  | 1 |
| Non-repetitive peak forward surge current | IFSM |  |  | 0.2 | A | 8.3ms single half sine-wave superimposed on rate load (JEDEC method) | 1 |
| DC reverse voltage | VR |  |  | 30 | V |  | 1 |
| Junction temperature range | TJ | -40 |  | 125 | °C |  | 1 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 1 |
| Power dissipation | PD |  |  | 200 | mW |  | 1 |
| Thermal resistance junction to ambient | RθJA |  |  | 500 | °C/W | Junction to ambient | 1 |
| Forward voltage | VF |  |  | 0.37 | V | IF = 1mA | 1 |

## CAD (KiCad official)

- Symbol: `RB751V-40-HF`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `rb751v-40-hf-etched.step` / `rb751v-40-hf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rb751v-40-hf.step` / `rb751v-40-hf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Comchip datasheet](docs/rb751v-40-hf-datasheet.pdf) (4 pp, sha256 `21920b7344b094c6`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/rb751v-40-hf-datasheet.pdf)