# 1SS193

**UMW** · Switching Diodes · SOT-23

1SS193 from UMW, in a SOT-23. 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 single switching diode (symbol shows current flowing from pin 1 to pin 3), with 80 V DC blocking voltage, 85 V non-repetitive peak reverse voltage and 300 mA forward continuous current. |
| 2 | NC | unconnected | Not connected; pin 2 is drawn as an open, unconnected terminal in the package schematic. |
| 3 | K | passive | Cathode of the single switching diode (symbol shows the diode bar toward pin 3), with 80 V DC blocking voltage and 100 mA average rectified output current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-23 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse breakdown voltage | V(BR) | 80 |  |  | V | IR=100μA | 1 |
| Forward voltage | VF1 |  |  | 0.61 | V | IF=1mA | 1 |
| Forward voltage | VF2 |  |  | 0.74 | V | IF=10mA | 1 |
| Forward voltage | VF3 |  | 0.92 | 1.2 | V | IF=100mA | 1 |
| Reverse current | IR1 |  |  | 0.1 | uA | VR=30V | 1 |
| Reverse current | IR2 |  |  | 0.5 | uA | VR=80V | 1 |
| Capacitance between terminals | CT |  | 1 | 3 | PF | VR=0V,f=1MHz | 1 |
| Reverse recovery time | trr |  | 1.6 | 4 | nS | IF=IR=10mA,Irr=0.1×IR | 1 |
| Non-Repetitive Peak Reverse Voltage | VRM |  |  | 85 | V | @Ta=25℃ | 1 |
| DC Blocking Voltage | VR |  |  | 80 | V | @Ta=25℃ | 1 |
| Forward Continuous Current | IFM |  |  | 300 | mA | @Ta=25℃ | 1 |
| Average Rectified Output Current | IO |  |  | 100 | mA | @Ta=25℃ | 1 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 2 | A | @t=8.3ms, @Ta=25℃ | 1 |
| Power Dissipation | PD |  |  | 150 | mW | @Ta=25℃ | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ | @Ta=25℃ | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 833 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `1SS193`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `1ss193-etched.step` / `1ss193-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1ss193.step` / `1ss193.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588907069785452544) (3 pp, sha256 `6e324ed6ffeadcc7`, retrieved 2026-10-17, tier: lcsc)
- **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/1ss193-datasheet.pdf)