INA185A1IDCKR

Overview

The INA185A1IDCKR is a bidirectional current-sense amplifier from Texas Instruments, housed in a SC-70-6 package. It operates with a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages from -0.2 V to +26 V. The device features a fixed gain of 20 V/V, a bandwidth of 350 kHz, and a maximum quiescent current of 260 µA. Key electrical specifications include an input offset voltage of ±100 µV at 12 V common-mode, a slew rate of 2 V/µs, and a maximum gain error of ±0.2% over the operating temperature range of -40°C to +125°C.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions via the REF pin
• High bandwidth and fast slew rate enabling rapid detection of current changes
• Wide common-mode voltage range independent of the low supply voltage
• Integrated matched resistor network minimizing gain error and temperature drift

Applications

• Motor control systems
• Battery monitors and balancers
• Power management circuits
• Lighting control applications
• Solar inverters

Procurement Notes

Verify the specific A1 suffix indicates the 20 V/V gain option and 350 kHz bandwidth. Confirm the IDCKR suffix corresponds to the SC-70-6 package variant. Ensure the component meets the required extended temperature range specifications for the target environment. Cross-reference the datasheet revision to confirm electrical characteristics match the design requirements.

Selection Notes

Select this part when space constraints require the SC-70-6 package while maintaining high-speed performance. The 20 V/V gain is suitable for applications requiring moderate amplification of shunt voltages. Consider the bidirectional mode if the application involves charging or discharging cycles where current direction reverses. Evaluate the output swing limitations relative to the ADC input range.

Part Context

This component belongs to the INA185 family of high-precision current sense amplifiers. It shares the same core architecture as other gain variants (A2, A3, A4) but is optimized for lower gain applications. The device is designed for cost-sensitive, space-constrained environments, offering a balance between precision and power consumption compared to higher-performance counterparts.

Replacement Considerations

Other INA185 variants such as INA185A2IDCKR, INA185A3IDCKR, and INA185A4IDCKR offer different fixed gains (50 V/V, 100 V/V, and 200 V/V respectively) within the same package. Substitution requires adjusting the external circuit gain or shunt resistor value to maintain equivalent output levels.