# 1SS398

**TOSHIBA** · Pre-ordered Products · TO-236-3(SOT-23-3)

1SS398 from TOSHIBA, in a TO-236-3(SOT-23-3). 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 | ANODE1 | passive | Anode of diode 1 in the dual series-connected pair; the pair is rated VR = 400 V and IO = 100 mA per unit. |
| 2 | CATHODE2 | passive | Cathode of diode 2 in the dual pair; the pair is rated VR = 400 V and IO = 100 mA per unit. |
| 3 | CATHODE1, ANODE2 | passive | Common node joining the cathode of diode 1 and the anode of diode 2 (series connection); the pair is rated VR = 400 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TOSHIBA |
| Package | TO-236-3(SOT-23-3) |
| Category | Solders / Accessories / Batteries |
| 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 (2) |  | 1 | 1.3 | V | IF = 100 mA | 1 |
| Reverse current | IR (1) |  |  | 0.05 | μA | VR = 300 V | 1 |
| Reverse current | IR (2) |  |  | 0.1 | μA | VR = 400 V | 1 |
| Total capacitance | CT |  | 2.5 | 5 | pF | VR = 0 V, f = 1 MHz | 1 |
| Maximum (peak) reverse voltage | VRM |  |  | 420 | V |  | 1 |
| Reverse voltage | VR |  |  | 400 | V |  | 1 |
| Maximum (peak) forward current | IFM |  |  | 300 | mA | *: Unit rating. Total rating = unit rating × 0.7 | 1 |
| Average forward current | IO |  |  | 100 | mA | *: Unit rating. Total rating = unit rating × 0.7 | 1 |
| Surge current | IFSM |  |  | 2 | A | 10 ms; *: Unit rating. Total rating = unit rating × 0.7 | 1 |
| Power dissipation | PD |  |  | 150 | mW | Note 2 (ordering part number other than LF(T) suffix) | 1 |
| Junction temperature | Tj |  |  | 125 | °C | Note 2 (ordering part number other than LF(T) suffix) | 1 |
| Storage temperature range | Tstg | -55 |  | 125 | °C | Note 2 (ordering part number other than LF(T) suffix) | 1 |

## CAD (KiCad official)

- Symbol: `1SS398`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: TO-236-3(SOT-23-3) (KiCad packages3D, STEP)
- 3D model files: `1ss398-etched.step` / `1ss398-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1ss398.step` / `1ss398.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOSHIBA datasheet](docs/1ss398-datasheet.pdf) (4 pp, sha256 `f2ae7d60610d242c`, retrieved 2026-10-31, 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/1ss398-datasheet.pdf)