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High precision ALLEGRO ACS781LLRTR-100U-T current sensor IC with common mode field rejection and loss

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High precision ALLEGRO ACS781LLRTR-100U-T current sensor IC with common mode field rejection and loss

working temperature : -40℃~+150℃

Current Range : 100A

Voltage - Supply : 3V~3.6V

Band Width : 120kHz

Response Time (tr) : 3us

Sensitivity : 26.4mV/A

Bidirectional Current Detection : Not supported

Description : 100A 26.4mV/A PSOF-7 Current Sensors RoHS

Mfr. Part # : ACS781LLRTR-100U-T

Model Number : ACS781LLRTR-100U-T

Package : PSOF-7

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Product Overview

The Allegro ACS781xLR is a fully integrated, automotive-grade linear Hall-effect current sensor IC designed for high-precision measurement of bidirectional AC and DC currents up to 100 A. Housed in a compact, low-profile (1.5 mm thick) core-less package, it offers ultra-low power loss due to its 200 internal conductor resistance. The device features advanced Hall sensor technology with common-mode field rejection for optimal performance in the presence of interfering magnetic fields. It provides an analog output voltage (VOUT) that varies linearly with the primary current (IP). Key advantages include factory-trimmed accuracy, chopper-stabilized signal path for stability across temperature ranges, and integrated shielding for high-level immunity to dV/dt and stray electric fields, making it ideal for high-side, high-voltage applications. The ACS781xLR is AEC-Q100 qualified.

Product Attributes

Brand: Allegro
Package Type: 7-pin PSOF (suffix LR)
Certifications: AEC-Q100 Automotive Qualification
Lead Finish: 100% matte tin
Leadframe Material: Oxygen-free copper
RoHS Compliant: Lead (Pb) free

Technical Specifications

Model	Sensed Current (IP)	Direction	Sensitivity (Typ.) (mV/A)	Operating Temperature (C)	Package
ACS781LLRTR-050B-T	50 A	Bidirectional	26.4	-40 to 150	Tape and reel
ACS781LLRTR-050U-T	0 to 50 A	Unidirectional	39.6	-40 to 150	Tape and reel
ACS781LLRTR-100B-T	100 A	Bidirectional	13.2	-40 to 150	Tape and reel
ACS781LLRTR-100U-T	0 to 100 A	Unidirectional	26.4	-40 to 150	Tape and reel
ACS781KLRTR-150B-T	150 A (transient) 100 A (continuous)	Bidirectional	8.8	-40 to 125	Tape and reel
ACS781KLRTR-150U-T	0 to 150 A (transient) 0 to 100 A (continuous)	Unidirectional	17.6	-40 to 125	Tape and reel

Characteristic	Symbol	Test Conditions	Min.	Typ.	Max.	Unit
Supply Voltage	VCC		3	3.3	3.6	V
Supply Current	ICC	Output open		11	15	mA
Internal Conductor Resistance	RPRIMARY	TA = 25C		200
Bandwidth	BWi	Small signal -3 dB, CL = 1 nF, TA = 25C		120		kHz
Output Rise Time	tr	TA = 25C, CL = 1 nF		3		s
Response Time	tRESPONSE	TA = 25C, CL = 1 nF		3.6		s
Quiescent Output Voltage (Bidirectional)	VOUT(QBI)	IP = 0 A, TA = 25C		VCC/2		V
Quiescent Output Voltage (Unidirectional)	VOUT(QU)	IP = 0 A, TA = 25C		VCC 0.1		V
Nominal Operating Ambient Temperature	TOP Range K		-40		125	C
Nominal Operating Ambient Temperature	TOP Range L		-40		150	C
Maximum Junction Temperature	TJ(max)				165	C
Storage Temperature	Tstg		-65		165	C

Characteristic	Symbol	Test Conditions	Rating	Unit
Overcurrent	IPOC	TA = 25C, 1 s on time, 60 s off time	285	A
Overcurrent	IPOC	TA = 85C, 1 s on time, 35 s off time	225	A
Overcurrent	IPOC	TA = 125C, 1 s on time, 30 s off time	170	A
Overcurrent	IPOC	TA = 150C, 1 s on time, 10 s off time	95	A

Characteristic	Symbol	Test Conditions	Value	Unit
Package Thermal Resistance	RJA	Mounted on Allegro evaluation board ASEK781-85-0807-001 with FR4 substrate and 8 layers of 2 oz. copper (1530 mm per layer) connected to primary leadframe and thermal vias. Includes power consumed by PCB.	18	C/W

Characteristic	Symbol	Notes	Rating	Unit
Forward Supply Voltage	VCC		6	V
Reverse Supply Voltage	VRCC		-0.5	V
Forward Output Voltage	VOUT		25	V
Reverse Output Voltage	VRIOUT		-0.5	V
Output Source Current	IOUT(Source)	VOUT to GND	2.8	mA
Output Sink Current	IOUT(Sink)	Minimum pull-up resistor of 500	10	mA

2504101957_ALLEGRO-ACS781LLRTR-100U-T_C2654916.pdf

High precision ALLEGRO ACS781LLRTR-100U-T current sensor IC with common mode field rejection and loss Images

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