MT9223CT-20BR5 from Magn Tek, in a SOP-8. 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	IP+	passive	Input current positive pin (primary conductor terminal 1). Tie pins 1 and 2 together externally; primary current flows in from IP+ (pins 1,2) to IP- (pins 3,4) through the internal ~1.2 mΩ conductor. Electrically isolated from the signal side (2.4 kVrms).
2	IP+	passive	Input current positive pin (primary conductor terminal 2). Must be shorted to pin 1 externally to carry full primary current.
3	IP-	passive	Input current negative pin (primary conductor return terminal 1). Must be shorted to pin 4 externally.
4	IP-	passive	Input current negative pin (primary conductor return terminal 2). Must be shorted to pin 3 externally.
5	GND	power_in	Signal ground for the sensor die. Reference for VCC, VOUT, and FILTER. Isolated from the primary current path (pins 1-4).
6	FILTER	passive	Filter pin to set output bandwidth. Connect an external capacitor CFILTER to GND; corner frequency fc = 1/(2·π·RF·CFILTER) with internal RF ≈ 1.8 kΩ. Increasing CFILTER lowers noise but proportionally increases response time (default BW = 150 kHz).
7	VOUT	output	Analog output signal proportional to primary current. Ratiometric to VCC; for the -20BR5 (bidirectional) variant: VOQ = VCC×0.5 (≈2.5 V at IP = 0 A), sensitivity 100 mV/A, span 0.5-4.5 V over ±20 A. DC output impedance ~5 Ω; drives loads ≥4.7 kΩ with CL up to 10 nF.
8	VCC	power_in	Power supply pin. 5 V single-supply operation (4.5-5.5 V), typical ICC = 14 mA (max 20 mA). Absolute max 6 V. Requires 0.1 µF CBYPASS from VCC to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	Magn Tek
Package	SOP-8
Category	Sensor
Pins	8

Ordering variants

Same part, different packaging or reel option.

MT9223CT-20BR5
MT9223CT-20UR5
MT9223CT-30UR5
MT9223CT-35UR5
MT9223CT-25BR5
MT9223CT-30BR5
MT9223CT-40BR5
MT9223CT-50BR5

CAD (KiCad official)

Symbol: MT9223CT-20BR5
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mt9223ct-20br5.step`	122 KB	You want the bare part, or you mark your own boards.
`mt9223ct-20br5-etched.step`	2.9 MB	You want the part with `MT9223CT-20BR5` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 705 faces against 147 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: Magn Tek datasheet (18 pp, sha256 bc2ca277f92a71e6, retrieved 2026-08-17, tier: lcsc)
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