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Texas Instruments INA281B1QDBVRQ1 — Logic ICs

INA281B1QDBVRQ1 Current Sense Amplifier, AEC-Q100, SOT-23-5

MPNINA281B1QDBVRQ1
End of Life

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.

$3.1Ref. price · indicative, final on quote
PackagingSC-74A, SOT-753
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

INA281B1QDBVRQ1 Technical Specifications
ParameterValue
SeriesAutomotive, AEC-Q100
Mounting typeSurface 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

Product 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.

Frequently asked questions

Is INA281B1QDBVRQ1 obsolete?

No. It remains a current-production part suitable for new designs.

Is INA281B1QDBVRQ1 automotive qualified?

Yes. The INA281B1QDBVRQ1 is part of the Automotive, AEC-Q100 series, meaning it has been qualified to the AEC-Q100 stress test qualification for integrated circuits used in automotive applications.

Does INA281B1QDBVRQ1 have a shutdown feature?

The evidence does not list a shutdown or enable pin for this device. The INA281B1QDBVRQ1 is a basic current-sense amplifier without a dedicated shutdown function. For power-saving applications, the supply current of 1.5 mA must be considered.

What is the INA281B1QDBVRQ1 equivalent?

A functional peer is the INA4290A2IRGVR, a quad-channel current-sense amplifier with similar bandwidth (1.1 MHz) and slew rate (2 V/µs), also AEC-Q100 qualified. The INA4290A2IRGVR offers four channels versus the single channel of the INA281B1QDBVRQ1, so it is not a pin-compatible drop-in but a higher-density alternative for multi-channel sensing.