# 1N4937G

**Yangzhou Yangjie Elec Tech** · Diodes - Fast Recovery Rectifiers · DO-41

1N4937G from Yangzhou Yangjie Elec Tech, in a DO-41. 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 | Yangzhou Yangjie Elec Tech |
| Package | DO-41 |
| 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 |
|---|---|---|---|---|---|---|---|
| Repetitive Peak Reverse Voltage | VRRM |  |  | 600 | V |  | 1 |
| Average Forward Current | IF(AV) |  |  | 1 | A | @60Hz sine wave, Resistance load, Ta=75℃ | 1 |
| Forward Surge Current (Non-repetitive) | IFSM |  |  | 30 | A | @60Hz Half-sine wave,1 cycle, Ta=25℃ | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | Tj | -55 |  | 150 | ℃ |  | 1 |
| Maximum instantaneous forward voltage drop per diode | VFM |  |  | 1.2 | V | IFM=1.0A | 1 |
| Maximum DC reverse current at rated DC blocking voltage per diode (Ta=25℃) | IRRM1 |  |  | 2.5 | μA | Ta=25℃ | 1 |
| Maximum DC reverse current at rated DC blocking voltage per diode (Ta=100℃) | IRRM2 |  |  | 100 | μA | Ta=100℃ | 1 |
| Reverse Recovery time | trr |  |  | 150 | ns | IF=0.5A IR=1A IRR=0.25A | 1 |
| Typical junction capacitance | Cj |  | 10 |  | pF | Measured at 1MHZ and Applied Reverse Voltage of 4.0 V.D.C. | 1 |
| Thermal Resistance (Typical), junction to ambient | RθJ-A |  | 60 |  | ℃/W |  | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD￾002 and JESD22-B102 ● Polarity:Color band denotes cathode end | 1 |

## CAD (KiCad official)

- Symbol: `1N4937G`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-41 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/1n4937g-datasheet.pdf) (4 pp, sha256 `dbcbbbef349b8b6c`, retrieved 2026-10-21, 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/1n4937g-datasheet.pdf)