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INA281A3QDBVRQ1

Texas Instruments · Current-Sensing Amplifiers · SOT-23-5

INA281A3QDBVRQ1 from Texas Instruments, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OUT	output	Output voltage of the current-sense amplifier, which must stay between GND - 0.3 V and VS + 0.3 V per the absolute maximum ratings.
2	GND	power_in	Ground reference pin for the device.
3	IN+	input	Shunt resistor positive sense input, with a common-mode input range of -4 V to 110 V and a differential input limit of -12 V to 12 V for this variant.
4	IN-	input	Shunt resistor negative sense input, with a common-mode input range of -4 V to 110 V and a differential input limit of -12 V to 12 V for this variant.
5	VS	power_in	Power supply pin, with an operating supply range of 2.7 V to 20 V (5 V nominal).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23-5
Category	Operational Amplifier/Comparator
Pins	5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage	VS	-0.3		22	V		3
Differential input voltage (INA281A3 and others)	VIN+, VIN-	-12		12	V	All others (not A5)	3
Common-mode input voltage	VIN+, VIN-	-20		120	V		3
Operating temperature	TA	-55		150	°C		3
Storage temperature	Tstg	-65		150	°C		3
Junction temperature	TJ			150	°C		3
Common-mode input range	VCM	-4	48	110	V		4
Operating supply range	VS	2.7	5	20	V		4
Ambient temperature	TA	-40		125	°C		4
Human body model ESD	V(ESD)	-2000		2000	V	Human body model (HBM), per AEC Q100-002, all pins	4
Charged device model ESD	V(ESD)	-1000		1000	V	Charged device model (CDM), per AEC Q100-011, all pins	4
Common-mode input range	VCM	-4		110	V	TA = -40 °C to +125 °C	4
Common-mode rejection ratio, input referred	CMRR	120	140		dB	-4 V ≤ VCM ≤ 110 V, TA = -40 °C to +125 °C	4
Offset voltage, input referred (INA281x3-Q1)	Vos	-250	30	250	µV		4
Offset voltage drift	dVos/dT	-1	0.1	1	µV/℃	TA = -40 ℃ to +125 ℃	4
Power supply rejection ratio, input referred	PSRR	-10	1.5	10	µV/V	2.7 V ≤ VS ≤ 20 V, TA = -40 °C to +125 °C	4
Input bias current IB+	IB+	10	20	30	uA	VSENSE = 0 V	5
Input bias current IB-	IB-	10	20	30	uA	VSENSE = 0 V	5
Gain error	GERR	-0.5	0.07	0.5	%	GND + 50 mV ≤ VOUT ≤ VS, 200 mV	5
Gain drift	GERR	-20	2	20	ppm/°C	TA = -40 °C to +125 °C	5
Swing to ground	VOUT		0.005	0.02	V	RLOAD = 10 kΩ, VSENSE = 0 V, TA = -40 °C to +125 °C	5
Supply voltage	Vs	2.7		20	V	TA = -40 °C to +125 °C	5
Quiescent current	IQ		1.5	2	mA		5
Quiescent current	IQ			2.25	mA	TA = -40 °C to +125 °C	5
Common-mode rejection ratio, AC	CMRR		65		dB	f = 50 kHz	4
Gain	G		100		V/V	INA281x3-Q1	5
Slew rate	SR		2.5		V/µs	Rising edge	5
Thermal resistance, junction-to-ambient	RθJA		184.7		°C/W	DBV (SOT-23), 5 pins	4
Thermal resistance, junction-to-board	RθJB		47.2		°C/W	DBV (SOT-23), 5 pins	4
Thermal resistance, junction-to-case (top)	RθJC(top)		105.6		°C/W	DBV (SOT-23), 5 pins	4

CAD (KiCad official)

Symbol: INA281A3QDBVRQ1
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)
3D model files: ina281a3qdbvrq1-etched.step / ina281a3qdbvrq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ina281a3qdbvrq1.step / ina281a3qdbvrq1.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (28 pp, sha256 64d5d08d5a8cfb41, retrieved 2026-10-28, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF