component
CD143A-SR70
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.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownCD143A-SR70
BOURNS · ESD And Surge Protection (TVS/ESD) · SOT-143
CD143A-SR70 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 | VN | power_in | Pin 1 (VN) is a rail terminal of the steering diode array as labeled in the Device Pinout table; the datasheet gives no separate voltage or current limit for this pin, only device-level ratings such as 70 V repetitive peak reverse voltage and 85 V reverse breakdown voltage. |
| 2 | I/O 1 | bidirectional | Pin 2 (I/O 1) is one of the two protected data/signal lines, with ESD protection of ±8 kV contact and ±15 kV air discharge per IEC 61000-4-2 and a 3 pF typical capacitance between I/O pins. |
| 3 | I/O 2 | bidirectional | Pin 3 (I/O 2) is the second protected data/signal line, with ESD protection of ±8 kV contact and ±15 kV air discharge per IEC 61000-4-2 and a 3 pF typical capacitance between I/O pins. |
| 4 | VP | power_in | Pin 4 (VP) is a rail terminal of the steering diode array as labeled in the Device Pinout table; the datasheet gives no separate voltage or current limit for this pin, only device-level ratings such as 70 V repetitive peak reverse voltage and 85 V reverse breakdown voltage. |
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 |
|---|---|---|---|---|---|---|---|
| Capacitance | Cj | 10 | pF | @ 0 V 1 MHz, measured between I/O pins and ground | 1 | ||
| Repetitive Peak Reverse Voltage | 70 | V | 1 | ||||
| Reverse Breakdown Voltage | VBR | 85 | V | I @ 50 μA | 1 | ||
| Forward Clamping Voltage | VFC | 1.5 | V | 8/20 μs IPP @ 1 A | 1 | ||
| Forward Clamping Voltage | VFC | 7 | V | 8/20 μs IPP @ 24 A | 1 | ||
| Reverse Leakage Current | IR | 1 | μA | @ VRRM | 1 | ||
| ESD Protection Contact Discharge | 8 | kV | IEC 61000-4-2 Contact Discharge | 1 | |||
| ESD Protection Air Discharge | 15 | kV | IEC 61000-4-2 Air Discharge | 1 | |||
| EFT Protection | 40 | A | IEC 61000-4-4 @ 5/50 ns | 1 | |||
| Surge Protection | 24 | A | IEC 61000-4-5 @ 8/20 μs, Level 2 (Line-Gnd) & Level 3 (Line-Line) | 1 | |||
| Forward Peak Pulse Current | IPP | 24 | A | tp = 8/20 μs | 1 | ||
| Operating Temperature Range | TJ | -55 | 25 | 150 | °C | 1 | |
| Storage Temperature Range | TSTG | -55 | 25 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
CD143A-SR70 - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
cd143a-sr70-etched.step/cd143a-sr70-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd143a-sr70.step/cd143a-sr70.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BOURNS datasheet (4 pp, sha256
bbd953b40f1387cc, 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).