JSM451 from JSMSEMI, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VSUP	power_in	Supply voltage input, 3.8 V to 40 V (absolute max 60 V). Typical supply current 3.5 mA (7 mA max). Decouple with a local ceramic capacitor; add series R (100 Ω) and CP (4.7 nF) near the sensor in noisy supplies.
2	GND	power_in	Ground reference return for the device.
3	VOUT	output	Open-collector Hall switch output; requires external pull-up resistor (typ. RL = 4.7 kΩ). Sinks up to 40 mA with Vsat <= 0.4 V at 20 mA. Output goes LOW when

Key specifications

Parameter	Value
Manufacturer	JSMSEMI
Package	SOT-23
Category	Sensor
Pins	3

Ordering variants

Same part, different packaging or reel option.

JSM451SOT23
JSM451TO92S

CAD (KiCad official)

Symbol: JSM451
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`jsm451.step`	59 KB	You want the bare part, or you mark your own boards.
`jsm451-etched.step`	1.1 MB	You want the part with `JSM451` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 282 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: JSMSEMI datasheet (5 pp, sha256 0161d5bd77bcf667, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF