component
CH421TB
Public Made by Adomby adom
COSEMITECH Hall Switches, TO-92S. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCH421TB
COSEMITECH · Hall Switches · TO-92S
CH421TB from COSEMITECH, in a TO-92S. 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; the datasheet gives an absolute maximum supply voltage of 40 V and a reverse voltage limit of -40 V. |
| 2 | GND | power_in | Ground pin, the device reference for the supply and the open-collector output. |
| 3 | OUT | output | Open-collector output pin; absolute output voltage range is -0.3 V to 40 V and output current is limited to 25 mA maximum. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | COSEMITECH |
| Package | TO-92S |
| Category | Magnetic 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 | ||
| Magnetic operating point | BOP | 10 | 45 | 90 | Gauss | TA=25oC | 5 |
| Magnetic release point | BRP | -90 | -45 | -10 | Gauss | TA=25oC | 5 |
| Magnetic hysteresis window | BHYST | 60 | 90 | 120 | Gauss | TA=25oC, /BOP-BRP/ | 5 |
| Maximum Switching Frequency | FSW | 100 | KHz | 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 | ||
| Thermal resistance, CH421T (TO-92S) | RTH | 203 | °C/W | CH421T (TO-92S) | 5 |
CAD (KiCad official)
- Symbol:
CH421TB - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92S (KiCad packages3D, STEP)
- 3D model files:
ch421tb-etched.step/ch421tb-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch421tb.step/ch421tb.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: COSEMITECH datasheet (10 pp, sha256
4c020170ea9c808e, 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).