# KTH1721SH-ST3

**CONNTEK** · Hall Switches · SOT-23-3L

KTH1721SH-ST3 from CONNTEK, 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 input, operating range 1.8 V to 5.5 V; a 1 μF capacitor between VDD and GND placed as close to the pin as possible is recommended to filter supply noise. |
| 2 | OUTPUT | output | CMOS push-pull output that goes low when the applied north-pole field exceeds BOP and stays low until the field drops below BRP, then goes high. |
| 3 | GND | power_in | Ground connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CONNTEK |
| Package | SOT-23-3L |
| 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 (recommended operating) | VDD | 1.8 |  | 5.5 | V | 芯片工作 | 5 |
| Supply voltage (absolute maximum) | VDD |  |  | 6 | V |  | 5 |
| Reverse supply voltage | VDD_REV | -0.3 |  |  | V |  | 5 |
| Output drive current | IOUTPUT |  |  | 5 | mA |  | 5 |
| Storage temperature range | TSTG | -50 |  | 150 | oC |  | 5 |
| Maximum junction temperature | TJ |  |  | 150 | oC |  | 5 |
| ESD HBM capability | ESD HBM |  |  | 8000 | V | HBM 人体模型 | 5 |
| Operating temperature range | TA | -40 |  | 125 | oC | 芯片工作 | 5 |
| Output low voltage (S series, 25Hz) | VOL |  | 0.05 | 0.15 | V | IOUT=1mA | 6 |
| Supply voltage (S series, 25Hz) | VDD | 1.8 |  | 5.5 | V | 工作状态 | 6 |
| Magnetic operating point BOPN (H series) | BOPN | -60 | -50 | -40 | Gauss | TA=+25℃， VDD=1.8V | 7 |
| Magnetic release point BRPN (H series) | BRPN | -45 | -35 | -25 | Gauss | TA=+25℃， VDD=1.8V | 7 |
| Average supply current (S series, 25Hz) | IDD(AVG) |  | 0.9 |  | μA | TA=+25℃， VDD=1.8V | 6 |
| Awake state supply current (S series, 25Hz) | IDD(Awake) |  | 2 |  | mA | TA=+25℃， VDD=1.8V | 6 |
| Sleep state supply current (S series, 25Hz) | IDD(Sleep) |  | 0.4 |  | μA | TA=+25℃， VDD=1.8V | 6 |
| Wake-up time (S series, 25Hz) | TAWAKE |  | 10 |  | μs | 工作状态 | 6 |
| Period (S series, 25Hz) | TPERIOD |  | 40 |  | ms | 工作状态 | 6 |
| Hysteresis /BOPN/-/BRPN/ (H series) | BHY |  | 15 |  | Gauss |  | 7 |

## CAD (KiCad official)

- Symbol: `KTH1721SH-ST3`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `kth1721sh-st3-etched.step` / `kth1721sh-st3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kth1721sh-st3.step` / `kth1721sh-st3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [CONNTEK datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757289329226203136) (11 pp, sha256 `f5b8e2504d167edf`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/kth1721sh-st3-datasheet.pdf)