The INA138 and INA168 (INA1x8) 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.
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| 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 (#) |
| Features |
| Rating |
| Operating temperature range (C) |
| Package Group |
| Package size: mm2:W x L (PKG) |
| INA138 | INA139 | INA168 | INA169 | INA170 |
|---|---|---|---|---|
| 36 | 36 | 60 | 60 | 60 |
| 2.7 | 2.7 | 2.7 | 2.7 | 2.7 |
| 1000 | 1000 | 1000 | 1000 | 1000 |
| 1 | 1 | 1 | 1 | 1 |
| Adjustable | Adjustable | Adjustable | Adjustable | Adjustable |
| 2 | 2 | 2 | 2 | 2 |
| 100 | 100 | 100 | 100 | 100 |
| 100 | 100 | 100 | 100 | 100 |
| 800 | 4400 | 800 | 4400 | 4000 |
| 36 | 40 | 60 | 60 | 60 |
| 2.7 | 2.7 | 2.7 | 2.7 | 2.7 |
| 0.06 | 0.125 | 0.06 | 0.125 | 0.125 |
| 1 | 1 | 1 | 1 | 1 |
| Current Output | Current Output | Current Output | Current Output |
Bi-directional Current Output |
| Catalog | Catalog | Catalog | Catalog | Catalog |
| -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 85 |
| SOT-23 | 5 | SOT-23 | 5 | SOT-23 | 5 | SOT-23 | 5 | VSSOP | 8 |
| 5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5) | 5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5) | 5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5) | 5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5) | 8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8) |
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