# CH424SR

**COSEMITECH** · Magnetic Sensors · SOT-23-3L

CH424SR from COSEMITECH, 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 | VDD | power_in | Supply voltage pin; operating range 3.3V to 30V, absolute maximum 40V and reverse voltage -40V. |
| 2 | OUT | output | Open collector output pin; absolute maximum output voltage 40V and output current 25mA, saturation voltage max 0.4V at 20mA. |
| 3 | GND | power_in | Ground pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSEMITECH |
| Package | SOT-23-3L |
| Category | Sensors |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VDD | 3.3 |  | 30 | V | -40 °C to 150 °C | 5 |
| Supply Current | IDD |  | 3.5 | 8 | mA | VDD = 5V | 5 |
| Output saturation voltage | VDSon |  |  | 0.4 | V | at 20mA, Gauss >120 | 5 |
| Output Leakage Current | IOFF |  |  | 10 | uA | B<-120GS | 5 |
| Output rise time | TR |  |  | 1.5 | uS | VDD =12V at 25 °C, CL= 20 pF | 5 |
| Output fall time | TF |  |  | 1.5 | uS | VDD =12V at 25 °C, CL= 20 pF | 5 |
| CH424 Magnetic operating point | BOP | 5 | 30 | 55 | Gauss | TA=25oC | 5 |
| CH424 Magnetic release point | BRP | -55 | -30 | -5 | Gauss | TA=25oC | 5 |
| CH424 Magnetic hysteresis window | BHYST | 40 | 60 | 80 | Gauss | TA=25oC /BOP-BRP/ | 5 |
| Operating temperature | T | -40 |  | 150 | °C |  | 5 |
| Storage temperature | TS | -40 |  | 150 | °C |  | 5 |
| Supply Voltage | VDD |  |  | 40 | V |  | 3 |
| VDD Reverse Voltage | VRDD | -40 |  |  | V |  | 3 |
| Supply Current | IDD |  |  | 20 | mA |  | 3 |
| Output Voltage | VOUT | -0.3 |  | 40 | V |  | 3 |
| Output Current | IOUT |  |  | 25 | mA |  | 3 |
| Operating Ambient Temperature | TA | -40 |  | 150 | °C |  | 3 |
| Storage Temperature | TS | -50 |  | 150 | °C |  | 3 |
| Junction temperature | TJ | -50 |  | 165 | °C |  | 3 |
| Maximum Switching Frequency | FSW |  |  | 100 | KHz |  | 5 |
| Thermal resistance CH424S/CH424NS | RTH |  | 303 |  | °C /W | SOT-23-3L | 5 |
| ESD HBM |  | -4000 |  | 4000 | V | All pins, HBM 100pF, 1.5 kohm | 4 |
| ESD MM |  | -200 |  | 200 | V | All pins, MM C=200pF, R=0Ω | 4 |
| ESD CDM |  | -750 |  | 750 | V | All pins, CDM | 4 |

## CAD (KiCad official)

- Symbol: `CH424SR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `ch424sr-etched.step` / `ch424sr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch424sr.step` / `ch424sr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSEMITECH datasheet](docs/ch424sr-datasheet.pdf) (10 pp, sha256 `8ef51b5e2e67fef1`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ch424sr-datasheet.pdf)