The INA181-Q1, INA2181-Q1, and INA4181-Q1 (INAx181-Q1) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181-Q1 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.
These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181-Q1 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181-Q1 draws a maximum supply current of 500 µA, and the quad-channel INA4181-Q1 draws a maximum supply current of 900 µA.
The INA181-Q1 is available in a 6-pin, SOT-23 package. The INA2181-Q1 is available in an 10-pin, VSSOP package. The INA4181-Q1 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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Part number | Order | Common mode voltage (Max) (V) | Common mode voltage (Min) (V) | Input offset (+/-) (Max) (uV) | Input offset drift (+/-) (Typ) (uV/C) | Gain (V/V) | Gain error (%) | Gain error drift (+/-) (Max) (ppm/°C) | CMRR (Min) (dB) | Bandwidth (kHz) | Supply voltage (Max) (V) | Supply voltage (Min) (V) | Iq (Max) (mA) | Number of channels (#) | Comparators (#) | Features | Rating | Operating temperature range (C) | Package Group | Package size: mm2:W x L (PKG) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
INA181-Q1 |
|
26 | -0.2 | 150 | 0.2 |
100
20 200 50 |
1 | 20 | 84 |
350
210 150 105 |
5.5 | 2.7 | 0.3 | 1 | 0 |
Bi-directional
Low-side Capable |
Automotive | -40 to 125 | SOT-23 | 6 | 6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6) |
INA2181-Q1 |
|
26 | -0.2 | 150 | 0.2 |
100
20 200 50 |
1 | 20 | 84 |
350
210 150 105 |
5.5 | 2.7 | 0.5 | 2 | 0 |
Bi-directional
Dual channel Low-side Capable |
Automotive | -40 to 125 | VSSOP | 10 | 10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10) |
INA4181-Q1 |
|
26 | -0.2 | 150 | 0.2 |
100
20 200 50 |
1 | 20 | 84 |
350
210 150 105 |
5.5 | 2.7 | 1 | 4 | 0 |
Bi-directional
Low-side Capable Quad channel |
Automotive | -40 to 125 | TSSOP | 20 | 20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20) |