INA281B1QDBVRQ1

Texas Instruments · Automotive, AEC-Q100 Series

Texas Instruments INA281B1QDBVRQ1, Automotive AEC-Q100 Current Sense Amplifier, 1 Circuit, 2.5 V/µs Slew Rate, 1.3 MHz Gain Bandwidth, 2.7 V to 20 V Supply, SOT-23-5, -40°C to 125°C.

Texas Instruments INA281B1QDBVRQ1
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[IN STOCK] In Stock: 2 pcs
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MOQ 1 · Tape & Reel (TR); Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T

Technical specifications

INA281B1QDBVRQ1 specifications
Parameter / AttributeSpecification / Value
SeriesAutomotive, AEC-Q100
MountingSurface Mount
Amplifier typeCurrent Sense
Voltage - input offset100 µV
Voltage - supply span2.7 V
Current - supply1.5mA
Current - input bias20 µA
Operating temperature-40°C ~ 125°C (TA)
Gain bandwidth product1.3 MHz
PackageTape & Reel (TR); Cut Tape (CT)
Slew rate2.5V/µs
CaseSC-74A, SOT-753
Number of circuits1

Technical details

With a gain-bandwidth product of 1.3 MHz, this amplifier supports DC and low-frequency AC current monitoring — adequate for load current, battery charge/discharge, and motor phase current sensing where the bandwidth of interest is below a few hundred kilohertz. The 100 µV input offset voltage sets the floor for the minimum measurable shunt voltage; at a 10 mΩ shunt, that offset corresponds to a 10 mA zero-current error, which must be budgeted in the system accuracy calculation. The slew rate of 2.5 V/µs limits the output rise time for large-signal steps. For a 2 V output swing, the rise time is approximately 0.8 µs, which is fast enough for overcurrent detection in most automotive loads but not for sub-microsecond fault response.

Supply current and package — board-level fit

Quiescent supply current is 1.5 mA typical — moderate for a current-sense amplifier, not a low-power part. The device is available in a 5-pin SOT-23-5 (SC-74A) package, a small footprint that fits space-constrained automotive modules such as battery management systems, motor controllers, and solenoid drivers. Surface-mount assembly is standard; no exposed thermal pad, so power dissipation is limited to the package's junction-to-ambient thermal resistance.

For production programs requiring a qualified automotive-grade current-sense amplifier, this part is a stable, long-availability choice.

INA281B1QDBVRQ1
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