The INA139 and INA169 are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, high-speed, 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 40 V for the INA139 and 2.7 V to 60 V for the INA169. Quiescent current is only 60 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 INA139 and INA169 are available in 5-pin SOT-23 packages. The INA139 device is specified for the –40°C to +125°C temperature range, and the INA169 is specified from –40°C to +85°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | INA1x9 High-Side Measurement Current Shunt Monitor datasheet (Rev. F) | PDF | HTML | Feb 27, 2017 |
| Application note | Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) | PDF | HTML | Apr 27, 2026 | |
| Circuit design | High-voltage, high-side floating current sensing circuit using current output, c (Rev. A) | PDF | HTML | Sep 26, 2024 | |
| E-book | An Engineer's Guide to Current Sensing (Rev. B) | Apr 12, 2022 | ||
| Application note | Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors (Rev. A) | PDF | HTML | Mar 21, 2022 | |
| Application brief | Extending Beyond the Max Common-Mode Range of Discrete Current-Sense Amplifiers (Rev. A) | PDF | HTML | Mar 10, 2022 | |
| Analog design Journal | 2Q 2012 Issue Analog Applications Journal | Apr 26, 2012 | ||
| Analog design Journal | 3Q 2011 Issue Analog Applications Journal | Sep 16, 2011 |
For additional terms or required resources, click any title below to view the detail page where available.
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |
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