ACS711KLCTR-12AB-T from Allegro MicroSystems LLC, 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	Primary current sense terminal (positive). Pins 1 and 2 are internally fused and form one side of the ~1.2 mΩ internal current-sensing conductor. Rated for 100 VAC/VDC working isolation to pins 5-8.
2	IP+	passive	Primary current sense terminal (positive). Tied internally to pin 1; both must be connected in parallel to carry the primary current.
3	IP-	passive	Primary current sense terminal (negative/return). Pins 3 and 4 are internally fused and form the return side of the internal ~1.2 mΩ conduction path.
4	IP-	passive	Primary current sense terminal (negative/return). Tied internally to pin 3; both must be connected in parallel to carry the primary current.
5	GND	power_in	Signal ground terminal. Reference for VCC, VIOUT, and FAULT.
6	FAULT	output	Overcurrent fault output; active low, open-drain. Latches low when
7	VIOUT	output	Analog output signal. Ratiometric voltage proportional to primary current IP with 110 mV/A sensitivity centered at VCC/2 for IP = 0 A. VIOH = VCC-0.3 V max, VIOL = 0.3 V max; drives up to 1 nF load; 100 kHz bandwidth, 4.6 µs response time.
8	VCC	power_in	Device power supply terminal. 3 V to 5.5 V (3.3 V nominal for rated accuracy). Supply current ICC ≈ 4 mA typ (5.5 mA max). Bypass with 0.1 µF ceramic to GND.

Key specifications

Parameter	Value
Manufacturer	Allegro MicroSystems LLC
Package	SOP-8
Category	Sensor
Pins	8

Ordering variants

ACS711KLCTR-12AB-T
ACS711KLCTR-12AB-TELCTR-12AB-T
ACS711KLCTR-12AB-TKLCTR-25AB-T
ACS711KLCTR-12AB-TELCTR-25AB-T
ACS711KLCTR-12AB-TKEXLT-31AB-T
ACS711KLCTR-12AB-TEEXLT-31AB-T
ACS711KLCTR-12AB-TKEXLT-15AB-T
ACS711KLCTR-12AB-TEEXLT-15AB-T

CAD (KiCad official)

Symbol: ACS711KLCTR-12AB-T
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
`acs711klctr-12ab-t.step`	122 KB	You want the bare part, or you mark your own boards.
`acs711klctr-12ab-t-etched.step`	2.6 MB	You want the part with `ACS711KLCTR-12AB-T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 664 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: Allegro MicroSystems LLC datasheet (18 pp, sha256 2123c7c534373016, 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