ACS725LLCTR-20AB-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 input terminal (positive side of the sensed current path). Pins 1 and 2 are tied together internally to the copper conduction path (1.2 mΩ typical) that carries the primary current being sensed. Fused internally.
2	IP+	passive	Primary current input terminal (positive side of the sensed current path). Pins 1 and 2 are tied together internally to the copper conduction path (1.2 mΩ typical). Fused internally.
3	IP-	passive	Primary current return terminal (negative side of the sensed current path). Pins 3 and 4 are tied together internally to the copper conduction path (1.2 mΩ typical). Fused internally.
4	IP-	passive	Primary current return terminal (negative side of the sensed current path). Pins 3 and 4 are tied together internally to the copper conduction path (1.2 mΩ typical). Fused internally.
5	GND	power_in	Signal ground terminal. Reference for VCC, VIOUT, and the FILTER capacitor.
6	FILTER	passive	Terminal for an external capacitor (C_F) that sets the output bandwidth. Forms an internal RC low-pass filter with R_F(int) = 1.8 kΩ typical; a 1 nF cap is used for the default 120 kHz bandwidth, larger caps reduce bandwidth for better noise performance.
7	VIOUT	output	Analog output voltage proportional to the sensed primary current I_P. Ratiometric to VCC with a quiescent output at VCC/2 and 66 mV/A sensitivity (typ) for the -20AB variant (±20 A range). Drives a resistive load ≥4.7 kΩ and capacitive load ≤10 nF.
8	VCC	power_in	Device power supply terminal. 3.3 V single-supply operation (3.0 V min, 3.6 V max); I_CC = 10 mA typ, 14 mA max. Bypass with 0.1 µF C_BYPASS to GND.

Key specifications

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

Ordering variants

ACS725LLCTR-20AB-TLLCTR-05AB-T
ACS725LLCTR-20AB-TLLCTR-10AB-T
ACS725LLCTR-20AB-TLLCTR-10AU-T
ACS725LLCTR-20AB-T
ACS725LLCTR-20AB-TLLCTR-20AU-T
ACS725LLCTR-20AB-TLLCTR-30AB-T
ACS725LLCTR-20AB-TLLCTR-30AB-T-H
ACS725LLCTR-20AB-TLLCTR-30AU-T
ACS725LLCTR-20AB-TLLCTR-40AB-T
ACS725LLCTR-20AB-TLLCTR-50AB-T

CAD (KiCad official)

Symbol: ACS725LLCTR-20AB-T
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Allegro MicroSystems LLC datasheet (24 pp, sha256 2c79a87c5a09ef07, 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