# MH248ESO

**MST Magnesensor Tech MST** · Hall Switches · SOT-23-3L

MH248ESO from MST Magnesensor Tech MST, 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 2.5 V to 3.5 V (absolute maximum 5 V); no reverse-voltage protection, so a 100 Ω series resistor is recommended. |
| 2 | OUT | output | Open-drain output that switches on when |B| exceeds the operate point; Vsat 0.3 V max at IOUT=1 mA, absolute maximum 5 V and 2 mA. |
| 3 | GND | power_in | Ground reference pin for the supply and output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MST Magnesensor Tech MST |
| 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 | VDD | 2.5 |  | 3.5 | V | Operating | 3 |
| Supply Current Awake State | IDD | 2.5 |  | 4 | mA | Awake State | 3 |
| Supply Current Sleep State | IDD | 8 |  | 12 | μA | Sleep State | 3 |
| Supply Current Average | IDD | 10 |  | 16 | μA | Average | 3 |
| Output Leakage Current | Ioff |  |  | 1 | uA | Output off | 3 |
| Output Low Voltage | Vsat |  |  | 0.3 | V | IOUT=1mA | 3 |
| Operate Point, S pole to branded side | BOPS | 6 |  | 60 | Gauss | S pole to branded side, B > BOP, Vout On | 3 |
| Operate Point, N pole to branded side | BOPN | -60 |  | -6 | Gauss | N pole to branded side, B > BOP, Vout On | 3 |
| Release Point, S pole to branded side | BRPS | 5 |  | 59 | Gauss | S pole to branded side, B < BRP, Vout Off | 3 |
| Release Point, N pole to branded side | BRPN | -60 |  | -5 | Gauss | N pole to branded side, B < BRP, Vout Off | 3 |
| Awake mode time | Taw |  | 70 |  | uS | Operating | 3 |
| Sleep mode time | TSL |  | 70 |  | mS | Operating | 3 |
| Duty Cycle | D,C |  | 0.1 |  | % |  | 3 |
| Hysteresis | BHYS |  | 7 |  | Gauss | /BOPx - BRPx/ | 3 |
| Supply Voltage absolute maximum | VDD |  |  | 5 | V |  | 3 |
| Output Voltage absolute maximum | Vout |  |  | 5 | V |  | 3 |
| Reverse voltage (VDD) (VOUT) |  | -0.3 |  |  | V |  | 3 |
| Output current | IOUT |  |  | 2 | mA |  | 3 |
| Operating temperature range | Ta | -40 |  | 85 | ℃ |  | 3 |
| Storage temperature range | Ts | -55 |  | 150 | ℃ |  | 3 |
| Maximum Junction Temperature | Tj |  |  | 150 | ℃ |  | 3 |
| Thermal resistance junction to ambient (SO) | θJA |  | 543 |  | ℃/W | SO package | 3 |
| Thermal resistance junction to case (SO) | θJC |  | 410 |  | ℃/W | SO package | 3 |
| Package Power Dissipation (SO) | PD |  | 230 |  | mW | SO package | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | UA:TO-92S,VK:TO-92S(4pin),VF:TO-92S(5pin),SO:SOT-23, SQ:QFN-3,ST:TSOT-23,SN:SOT-553,SF:SOT-89(5pin), | 2 |

## CAD (KiCad official)

- Symbol: `MH248ESO`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `mh248eso-etched.step` / `mh248eso-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mh248eso.step` / `mh248eso.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MST Magnesensor Tech MST datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586181142379188224) (6 pp, sha256 `00c9d8ef70deb72a`, retrieved 2026-10-20, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/mh248eso-datasheet.pdf)