# ES1CL

**Changjing** · Fast Recovery/High Efficiency Diode · SOD-123FL

ES1CL from Changjing, in a SOD-123FL. 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, marked by the color band on the package; connects to the positive side of the rectifier when conducting forward current (IF(AV) 1.0 A, VRRM 150 V for ES1CL). |
| 2 | A | passive | Anode, the end opposite the cathode band; forward current flows from anode to cathode (VF 0.95 V typ at IF=1.0A, max 1.25 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOD-123FL |
| 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 |  |  | 150 | V | ES1CL column | 1 |
| Maximum RMS Voltage | VRMS |  |  | 105 | V | ES1CL column | 1 |
| Average Forward Current | IF(AV) |  |  | 1 | A | 60Hz Half-sine wave, Resistance load, Ta=90℃ | 1 |
| Surge (Non-repetitive) Forward Current | IFSM |  |  | 30 | A | 60Hz Half-sine wave, 1 cycle, Ta=25℃ | 1 |
| Peak Forward Voltage | VF |  |  | 0.95 | V | IF=1.0A | 1 |
| Maximum reverse recovery time | trr |  |  | 35 | ns | IF=0.5A,IR=1.0A,Irr=0.25A | 1 |
| Peak Reverse Current | IRRM1 |  |  | 5 | A | VRM=VRRM, Ta=25 | 1 |
| Peak Reverse Current | IRRM2 |  |  | 100 | A | VRM=VRRM, Ta=100 | 1 |
| Thermal Resistance junction to ambient | RθJ-A |  | 70 |  | ℃/W | Between junction and ambient, P.C.B. 5.0mm x 5.0mm copper pad | 1 |
| Thermal Resistance junction to lead | RθJ-L |  | 25 |  | ℃/W | Between junction and terminal, P.C.B. 5.0mm x 5.0mm copper pad | 1 |
| Operation Junction and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | ℃ |  | 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 | copper |  | Thermal resistance from junction to ambient and from junction to lead mounted on P.C.B. with 0.2" x 0.2" (5.0 mm x 5.0 mm) copper | 1 |

## CAD (KiCad official)

- Symbol: `ES1CL`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `es1cl-etched.step` / `es1cl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `es1cl.step` / `es1cl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/es1cl-datasheet.pdf) (4 pp, sha256 `a545381e33f91bf9`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/es1cl-datasheet.pdf)