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INA181-Q1

26V common-mode bidirectional current-sense amplifier with reference input

Uses one fixed-gain channel and a reference input for low-side or protected low-voltage high-side current sensing in cost-sensitive automotive load monitoring. Offset at zero common mode is lower than at 12V, and small-signal bandwidth falls as gain increases. Only an A1 orderable example is listed; 350kHz and ±150µV do not apply to every gain and high-side condition.

AutomotiveActiveExample package: SOT-23 (DBV) · 6 pinVerified 2026-11-06

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5-second verdict

AutomotiveAEC-Q100 Grade 1

Temperature−40°C to +125°C (TA)

Functional safetyFunctional Safety-Capable

LifecycleActive

In one sentence: Qualification is grounded in this TI product's documentation; no grade is inferred from temperature. An ordering table may show junction or variant-specific limits, which must be distinguished from ambient conditions. TI explicitly lists Functional Safety-Capable. This is a device-documentation category, not system ASIL certification; assess the exact function, assumptions and safety manual.

Key specifications

Operating common-mode range−0.2–26 V; not suitable for direct 48 V high-side sensing

Supply range2.7–5.5 V

A1–A4 fixed gains20 / 50 / 100 / 200 V/V, respectively

Zero-common-mode offset (25°C maximum)±150 µV at VCM = 0 V; VS = 5 V, VREF = VS/2

12V-common-mode offset (25°C maximum)±500 µV at VCM = 12 V; VS = 5 V, VREF = VS/2

Over-temperature gain error (maximum)±1%; TA = −40–125°C, VOUT = 0.5 V to VS − 0.5 V; VS = 5 V, VCM = 12 V, VREF = VS/2

A1–A4 bandwidth (typical)350 / 210 / 150 / 105 kHz; CLOAD = 10 pF

Channels and direction1 channel; bidirectional with a suitable REF bias

Orderable variants (OPNs)

The GPN is for selection; the full OPN is for ordering. These examples were observed on the verification date, not live stock. Variants may differ in package, temperature, gain/threshold and, for PMICs, NVM/sequencing. Distinguish TA from TJ in the exact datasheet.

OPN	Package	Temperature	Note
INA181A1QDBVRQ1	SOT-23 (DBV) · 6 pin	-40 to +125°C (TI OPN listing; verify TA/TJ)	Verify exact OPN, temperature definition and revision; not a stock claim.

INA181A1QDBVRQ1-40 to +125°C (TI OPN listing; verify TA/TJ)

SOT-23 (DBV) · 6 pinVerify exact OPN, temperature definition and revision; not a stock claim.

Official ordering page: https://www.ti.com/product/INA181-Q1

Typical applications

Bidirectional load-current monitoring with a low-side shunt12V high-side sensing with common mode and transients kept within 26V

FAQ

Why can't a 12V high-side design simply use the ±150µV offset specification?

The ±150µV maximum applies at 25°C and VCM=0V. At the same temperature and VCM=12V the maximum is ±500µV, with default VS=5V and VREF=VS/2. Add shunt tolerance and temperature drift separately. The ±1% gain-error limit covers −40 to +125°C only within the specified output range.

Are all gains 350kHz, and is 1% still guaranteed near the supply rails?

No. 350kHz is the typical A1 bandwidth. A2/A3/A4 are 210/150/105kHz with the table's 10pF load. Maximum ±1% gain error requires VOUT from 0.5V to VS−0.5V; near-rail output swing capability does not extend that accuracy specification.

Can it directly sense a 48V bus or serve as an isolated HV sensor?

No. The common-mode ceiling is 26V and the supply ceiling is 5.5V; these are separate constraints. There is no isolation barrier. A higher-voltage bus requires a suitable sensing architecture: a small shunt drop does not imply low input voltage relative to ground.

How should I verify the INA181-Q1 orderable?

The page lists 1 OPN examples from official material checked on 2026-11-06. Match package, function options and temperature definitions; obtain live price/stock from TI or authorized distributors.

Sources and verification

Related selection and design checks

All selection guides →What does TI Q1 mean →AEC-Q100 grades →Model Y TI BOM →

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