# SRM20L300DC

**YFW** · Schottky Diodes · TO-263

SRM20L300DC from YFW, in a TO-263. 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 | A1 | passive | Anode of diode leg 1, rated 10 A average forward current per leg and 300 V repetitive peak reverse voltage. |
| 2 | K | passive | Common cathode of both diode legs (20 A total average forward current), also connected to the mounting tab. |
| 3 | A2 | passive | Anode of diode leg 2, rated 10 A average forward current per leg and 300 V repetitive peak reverse voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | TO-263 |
| 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 Drop | VF |  | 0.77 | 0.83 | V | IF=3A, TA=25°C | 1 |
| Forward Voltage Drop | VF |  | 0.92 | 0.98 | V | IF=10A, TA=25°C | 1 |
| Maximum Reverse Current | IR |  | 0.2 | 2 | µA | VR=300V, TA=25°C | 1 |
| Maximum Repetitive Peak Reverse Voltage | VRRM |  |  | 300 | V | Ta=25°C | 1 |
| Working Peak Reverse Voltage | VRWM |  |  | 300 | V | Ta=25°C | 1 |
| Maximum DC Blocking Voltage | VDC |  |  | 300 | V | Ta=25°C | 1 |
| Maximum Average Forward Rectified Current (Per Leg) | IO |  |  | 10 | A | Per leg, Ta=25°C | 1 |
| Maximum Average Forward Rectified Current (Total) | IO |  |  | 20 | A | Total, Ta=25°C | 1 |
| Peak Forward Surge Current | IFSM |  |  | 180 | A | 8.3 ms single half sine-wave, superimposed on rated load (JEDEC method), Ta=25°C | 1 |
| Operating Temperature Range | TJ | -50 |  | 150 | °C | Ta=25°C | 1 |
| Storage Temperature Range | TSTG | -50 |  | 150 | °C | Ta=25°C | 1 |
| Forward Voltage Drop | VF |  | 0.65 |  | V | IF=3A, TA=125°C | 1 |
| Forward Voltage Drop | VF |  | 0.82 |  | V | IF=5A, TA=25°C | 1 |
| Forward Voltage Drop | VF |  | 0.69 |  | V | IF=5A, TA=125°C | 1 |
| Forward Voltage Drop | VF |  | 0.78 |  | V | IF=10A, TA=125°C | 1 |
| Maximum Reverse Current | IR |  | 20 |  | µA | VR=300V, TA=125°C | 1 |
| Typical Thermal Resistance, Junction to Case (TO-220AB, TO-263) | RθJC |  | 2 |  | °C/W | Junction to case per leg mounted on heatsink | 1 |

## CAD (KiCad official)

- Symbol: `SRM20L300DC`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263 (KiCad packages3D, STEP)
- 3D model files: `srm20l300dc-etched.step` / `srm20l300dc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `srm20l300dc.step` / `srm20l300dc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603086889600118784) (3 pp, sha256 `3c2e30ad91d97d68`, retrieved 2026-10-18, 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/srm20l300dc-datasheet.pdf)