component
CD143A-SR05
Public Made by Adomby adom
BOURNS ESD And Surge Protection (TVS/ESD), SOT-143. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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CD143A-SR05
BOURNS · ESD And Surge Protection (TVS/ESD) · SOT-143
CD143A-SR05 from BOURNS, in a SOT-143. 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 | GND | power_in | Ground reference pin; the datasheet states clamping voltage is measured from Pin 4 to Pin 1 and that GND is connected to ground. |
| 2 | I/O | bidirectional | Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz. |
| 3 | I/O | bidirectional | Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz. |
| 4 | REF | power_in | Connected to +VCC; the working peak voltage is 5.0 V for CD143A-SR05 and the clamping voltage is referenced from this pin to Pin 1. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage Minimum | VBR | 6 | V | @ 1 mA; from Pin 4 to Pin 1 | 1 | ||
| Clamping Voltage Maximum | VC | 9.8 | V | @ IP = 1 A; from Pin 4 to Pin 1 | 1 | ||
| Clamping Voltage Maximum | VC | 20 | V | @ 28 A | 1 | ||
| Leakage Current | ID | 5 | µA | @ VWM | 1 | ||
| Capacitance Maximum per Data Line | CJ | 10 | pF | @ 0 V, 1 MHz | 1 | ||
| Peak Pulse Power | PPP | 500 | W | tp= 8/20 µs | 1 | ||
| Peak Pulse Current (-SR05) | IPP | 30 | A | tp= 8/20 µs; -SR05 variant | 1 | ||
| Forward Voltage | VF | 1.5 | V | If = 1 A 8/20 µs | 1 | ||
| Operating Temperature | TJ | -55 | 150 | °C | 1 | ||
| Storage Temperature | TSTG | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
CD143A-SR05 - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
cd143a-sr05-etched.step/cd143a-sr05-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd143a-sr05.step/cd143a-sr05.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BOURNS datasheet (5 pp, sha256
64b38a856f90bed8, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# CD143A-SR05
**BOURNS** · ESD And Surge Protection (TVS/ESD) · SOT-143
CD143A-SR05 from BOURNS, in a SOT-143. 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 | GND | power_in | Ground reference pin; the datasheet states clamping voltage is measured from Pin 4 to Pin 1 and that GND is connected to ground. |
| 2 | I/O | bidirectional | Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz. |
| 3 | I/O | bidirectional | Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz. |
| 4 | REF | power_in | Connected to +VCC; the working peak voltage is 5.0 V for CD143A-SR05 and the clamping voltage is referenced from this pin to Pin 1. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage Minimum | VBR | 6 | | | V | @ 1 mA; from Pin 4 to Pin 1 | 1 |
| Clamping Voltage Maximum | VC | | | 9.8 | V | @ IP = 1 A; from Pin 4 to Pin 1 | 1 |
| Clamping Voltage Maximum | VC | | | 20 | V | @ 28 A | 1 |
| Leakage Current | ID | | | 5 | µA | @ VWM | 1 |
| Capacitance Maximum per Data Line | CJ | | | 10 | pF | @ 0 V, 1 MHz | 1 |
| Peak Pulse Power | PPP | | | 500 | W | tp= 8/20 µs | 1 |
| Peak Pulse Current (-SR05) | IPP | | | 30 | A | tp= 8/20 µs; -SR05 variant | 1 |
| Forward Voltage | VF | | | 1.5 | V | If = 1 A 8/20 µs | 1 |
| Operating Temperature | TJ | -55 | | 150 | °C | | 1 |
| Storage Temperature | TSTG | -55 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `CD143A-SR05`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `cd143a-sr05-etched.step` / `cd143a-sr05-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd143a-sr05.step` / `cd143a-sr05.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [BOURNS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589934191996395520) (5 pp, sha256 `64b38a856f90bed8`, retrieved 2026-10-18, 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/cd143a-sr05-datasheet.pdf)