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CD143A-SR3.3
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-SR3.3
BOURNS · ESD And Surge Protection (TVS/ESD) · SOT-143
CD143A-SR3.3 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 for the device; the operating supply is specified as Vdd - Gnd, and all DC I/O voltages are referenced to Gnd (Gnd -0.5 V minimum on I/O pins). |
| 2 | I/O | bidirectional | ESD-protected data line; DC voltage at any I/O pin must stay between (Gnd -0.5) V and (Vdd +0.5) V, and the line withstands ±30 kV air/contact per IEC 61000-4-2. |
| 3 | I/O | bidirectional | ESD-protected data line; DC voltage at any I/O pin must stay between (Gnd -0.5) V and (Vdd +0.5) V, and the line withstands ±30 kV air/contact per IEC 61000-4-2. |
| 4 | Vdd | power_in | Positive supply pin; operating supply voltage (Vdd - Gnd) is rated 3.8 V maximum. |
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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power | PPP | 200 | W | tp = 8/20 µs | 1 | ||
| Peak Pulse Current | IPP | 12 | A | tp = 8/20 µs | 1 | ||
| Operating Supply Voltage (Vdd - Gnd) | Vdc | 3.8 | V | Vdd - Gnd | 1 | ||
| ESD Protection per IEC 61000-4-2 (Air, Contact) | Vesd | -30 | 30 | kV | IEC 61000-4-2, Air, Contact | 1 | |
| Operating Temperature | TJ | -55 | 125 | °C | 1 | ||
| Storage Temperature | TSTG | -55 | 150 | °C | 1 | ||
| Breakdown Voltage Minimum | VBR | 4.5 | V | @ 1 mA | 1 | ||
| Working Peak Voltage | VWM | 3.3 | V | 1 | |||
| Clamping Voltage Maximum | VC | 7 | V | @ IP = 1 A | 1 | ||
| Clamping Voltage Maximum | VC | 8.2 | V | @ IP = 10 A | 1 | ||
| Reverse Leakage Current Maximum | IL | 5 | µA | @ VWM | 1 | ||
| Forward Voltage Maximum | Vf | 1 | V | @ 15 mA, from Pin 1 to Pin 4 | 1 | ||
| Leakage Current | ID | 1 | µA | @ VWM | 1 | ||
| Capacitance Typical | CJ | 4.5 | pF | @ 0 V, 1 MHz | 1 |
CAD (KiCad official)
- Symbol:
CD143A-SR3.3 - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
cd143a-sr3-3-etched.step/cd143a-sr3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd143a-sr3-3.step/cd143a-sr3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BOURNS datasheet (5 pp, sha256
cf77b0aa0614565c, retrieved 2026-10-17, 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-SR3.3
**BOURNS** · ESD And Surge Protection (TVS/ESD) · SOT-143
CD143A-SR3.3 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 for the device; the operating supply is specified as Vdd - Gnd, and all DC I/O voltages are referenced to Gnd (Gnd -0.5 V minimum on I/O pins). |
| 2 | I/O | bidirectional | ESD-protected data line; DC voltage at any I/O pin must stay between (Gnd -0.5) V and (Vdd +0.5) V, and the line withstands ±30 kV air/contact per IEC 61000-4-2. |
| 3 | I/O | bidirectional | ESD-protected data line; DC voltage at any I/O pin must stay between (Gnd -0.5) V and (Vdd +0.5) V, and the line withstands ±30 kV air/contact per IEC 61000-4-2. |
| 4 | Vdd | power_in | Positive supply pin; operating supply voltage (Vdd - Gnd) is rated 3.8 V maximum. |
## 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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power | PPP | | | 200 | W | tp = 8/20 µs | 1 |
| Peak Pulse Current | IPP | | | 12 | A | tp = 8/20 µs | 1 |
| Operating Supply Voltage (Vdd - Gnd) | Vdc | | | 3.8 | V | Vdd - Gnd | 1 |
| ESD Protection per IEC 61000-4-2 (Air, Contact) | Vesd | -30 | | 30 | kV | IEC 61000-4-2, Air, Contact | 1 |
| Operating Temperature | TJ | -55 | | 125 | °C | | 1 |
| Storage Temperature | TSTG | -55 | | 150 | °C | | 1 |
| Breakdown Voltage Minimum | VBR | 4.5 | | | V | @ 1 mA | 1 |
| Working Peak Voltage | VWM | | | 3.3 | V | | 1 |
| Clamping Voltage Maximum | VC | | | 7 | V | @ IP = 1 A | 1 |
| Clamping Voltage Maximum | VC | | | 8.2 | V | @ IP = 10 A | 1 |
| Reverse Leakage Current Maximum | IL | | | 5 | µA | @ VWM | 1 |
| Forward Voltage Maximum | Vf | | | 1 | V | @ 15 mA, from Pin 1 to Pin 4 | 1 |
| Leakage Current | ID | | | 1 | µA | @ VWM | 1 |
| Capacitance Typical | CJ | | 4.5 | | pF | @ 0 V, 1 MHz | 1 |
## CAD (KiCad official)
- Symbol: `CD143A-SR3.3`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `cd143a-sr3-3-etched.step` / `cd143a-sr3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd143a-sr3-3.step` / `cd143a-sr3-3.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/8555352046760665088) (5 pp, sha256 `cf77b0aa0614565c`, retrieved 2026-10-17, 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-sr3-3-datasheet.pdf)