# CMDSH-4E TR PBFREE

**Central Semicon** · Schottky Diodes · SOD-323

CMDSH-4E TR PBFREE from Central Semicon, in a SOD-323. 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 | Cathode | passive | Cathode terminal of the Schottky diode (lead code 1 on the SOD-323 outline), rated for a peak repetitive reverse voltage VRRM of 40 V and an average forward current IO of 200 mA. |
| 2 | Anode | passive | Anode terminal of the Schottky diode (lead code 2 on the SOD-323 outline), with a peak repetitive forward current IFRM of 350 mA and a peak forward surge current IFSM of 750 mA (tp=10 ms). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Central Semicon |
| Package | SOD-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Repetitive Reverse Voltage | VRRM |  |  | 40 | V |  | 1 |
| Average Forward Current | IO |  |  | 200 | mA |  | 1 |
| Peak Repetitive Forward Current | IFRM |  |  | 350 | mA |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 750 | mA | tp=10ms | 1 |
| Power Dissipation | PD |  |  | 250 | mW |  | 1 |
| Operating and Storage Junction Temperature | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| Thermal Resistance | ΘJA |  |  | 500 | °C/W |  | 1 |
| Reverse Current | IR |  | 90 | 500 | nA | VR=25V | 1 |
| Reverse Current | IR |  | 25 | 100 | μA | VR=25V, TA=100°C | 1 |
| Breakdown Voltage | BVR | 40 | 50 |  | V | IR=100μA | 1 |
| Forward Voltage | VF |  | 0.29 | 0.33 | V | IF=2.0mA | 1 |
| Forward Voltage | VF |  | 0.37 | 0.42 | V | IF=15mA | 1 |
| Forward Voltage | VF |  | 0.51 | 0.8 | V | IF=100mA | 1 |
| Forward Voltage | VF |  | 0.65 | 1 | V | IF=200mA | 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 | 1. If requesting Tin/Lead plated devices, add the suffix “ TIN/LEAD” to the part number when ordering (example: 2N2222A TIN/LEAD). | 5 |

## CAD (KiCad official)

- Symbol: `CMDSH-4E TR PBFREE`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `cmdsh-4e-tr-pbfree-etched.step` / `cmdsh-4e-tr-pbfree-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cmdsh-4e-tr-pbfree.step` / `cmdsh-4e-tr-pbfree.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Central Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590456270714142720) (5 pp, sha256 `6ce6d45a3fd2d040`, retrieved 2026-10-30, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/cmdsh-4e-tr-pbfree-datasheet.pdf)