# CDSOT23-0502B

**BOURNS** · ESD Protection Devices · SOT-23-3L

CDSOT23-0502B from BOURNS, in a SOT-23-3L. 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 | I/O1 | passive | Protected line 1 with bidirectional TVS clamp to pin 3, 5 V working peak reverse voltage, 6.0 V minimum breakdown at 1 mA, 15 pF max channel capacitance. |
| 2 | I/O2 | passive | Protected line 2 with bidirectional TVS clamp to pin 3, 5 V working peak reverse voltage, 6.0 V minimum breakdown at 1 mA, 15 pF max channel capacitance. |
| 3 | COMMON | passive | Common node of both bidirectional TVS diodes, tested against pins 1 and 2; the datasheet does not label it as ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | SOT-23-3L |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Current (tp = 8/20µs) | IPPM |  |  | 8.5 | A | tp = 8/20µs | 1 |
| ESD per IEC 61000-4-2 (Air) | VESD |  |  | 22 | kV | per IEC 61000-4-2 (Air) | 1 |
| ESD per IEC 61000-4-2 (Contact) | VESD |  |  | 15 | kV | per IEC 61000-4-2 (Contact) | 1 |
| Operating Temperature | TOPR | -55 |  | 125 | ºC |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ºC |  | 1 |
| Minimum Reverse Breakdown Voltage | VBR | 6 |  |  | V | @ 1mA | 1 |
| Reverse Standoff Voltage | VM |  |  | 5 | V |  | 1 |
| Maximum Leakage Current | IL |  |  | 2.5 | µA | @ VWM | 1 |
| Maximum Clamping Voltage 1 | VCL1 |  |  | 8 | V | IPP=5 A, contact | 1 |
| Maximum Clamping Voltage 2 | VCL2 |  |  | 9 | V | IPP=7 A, contact | 1 |
| Max Channel Input Capacitance | CN |  |  | 15 | pF | @ 0 V, 1 MHz | 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 | This is a molded SOT23-3L package with lead free 100 % Matte Sn on the lead frame. It weighs approximately 8 mg and has a | 2 |

## CAD (KiCad official)

- Symbol: `CDSOT23-0502B`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9750000000000001 mm tall, datasheet A, midpoint of min and max). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `cdsot23-0502b-etched.step` / `cdsot23-0502b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cdsot23-0502b.step` / `cdsot23-0502b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BOURNS datasheet](docs/cdsot23-0502b-datasheet.pdf) (4 pp, sha256 `0693c6f88c67ef48`, retrieved 2026-11-12, 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/cdsot23-0502b-datasheet.pdf)