The INA138 and INA168 are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.
Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.
The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.
Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.
For all available packages, see the orderable addendum at the end of the datasheet.
| Input Offset (+/-) (Max) (uV) |
| Input Offset Drift (+/-) (Typ) (uV/Degrees Celsius) |
| Iq (Max) (mA) |
| Gain (V/V) |
| Small-Signal Bandwidth (Typ) (MHz) |
| CMRR (Min) (dB) |
| Vs (Min) (V) |
| Vs (Max) (V) |
| Common Mode Range (Min) |
| Common Mode Range (Max) |
| Special Features |
| Rating |
| Operating Temperature Range (C) |
| Package Group |
| Estimated Package Size (WxL) (mm2) |
| Approx. Price (US$) |
| INA138 | INA138-Q1 | INA168 | INA168-Q1 |
|---|---|---|---|
| 1000 | 2000 | 1000 | 1000 |
| 1 | 1 | 1 | 1 |
| 0.06 | 0.06 | 0.06 | 0.06 |
| 1 to 100 | 1 to 100 | 1 to 100 | 1 to 100 |
| 0.8 | 0.8 | 0.8 | 0.8 |
| 120 | 120 | 120 | 120 |
| 2.7 | 2.7 | 2.7 | 2.7 |
| 36 | 36 | 60 | 60 |
| 2.7 | 2.7 | 2.7 | 2.7 |
| 36 | 36 | 60 | 60 |
| Analog Output | Analog Output | Analog Output | Analog Output |
| Catalog | Automotive | Catalog | Automotive |
| -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| SOT-23 | TSSOP | SOT-23 | SOT-23 TSSOP |
| 5SOT-23: 1.6 x 2.9: 10 mm2 | 8TSSOP: 4.4 x 3: 19 mm2 | 5SOT-23: 1.6 x 2.9: 10 mm2 | 5SOT-23: 1.6 x 2.9: 10 mm2 8TSSOP: 4.4 x 3: 19 mm2 |
| 0.65 | 1ku | 0.80 | 1ku | 0.80 | 1ku | 0.94 | 1ku |
| Sample & Buy | Sample & Buy | Sample & Buy | Sample & Buy |
| Version | Part Number | Definition |
|---|---|---|
| Automotive | INA138-Q1 | Q100 devices qualified for high-reliability automotive applications targeting zero defects |