INA185A4IDCKR

Overview

The INA185A4IDCKR is a bidirectional, high-precision current sense amplifier from Texas Instruments. It operates with a supply voltage 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 200 V/V, a bandwidth of 105 kHz, and an offset voltage maximum of ±100 µV at 12 V common-mode. It includes rail-to-rail output swing, low quiescent current of 260 µA, and is housed in a SC-70 (DCK) package.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions
• High precision performance with integrated matched resistor gain network
• Wide common-mode input range independent of supply voltage
• Rail-to-rail output swing for linear operation near supply rails

Applications

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

Procurement Notes

Verify the specific A4 suffix indicates the 200 V/V gain option and check the DCK suffix confirms the SC-70 package. Confirm the operating temperature range meets system requirements of -40°C to +125°C. Ensure the datasheet version matches the required electrical characteristics for offset voltage and CMRR specifications.

Selection Notes

Select this component when bidirectional sensing is required with a fixed gain of 200 V/V. The wide common-mode range allows use in high-side or low-side configurations up to 26 V. Consider the 105 kHz bandwidth and 2 V/µs slew rate for dynamic response needs. The SC-70 package suits space-constrained designs compared to larger footprints.

Part Context

This part belongs to the INA185 family of current sense amplifiers designed for cost-sensitive, space-constrained applications. The family offers various gain options (20, 50, 100, 200 V/V) and packages (SC-70, SOT-563). The INA185 integrates a matched resistor network to minimize gain error and temperature drift, supporting single-supply operation.

Replacement Considerations

Other INA185 variants with different gain suffixes (A1, A2, A3) or package suffixes (DRL for SOT-563) may be compatible if gain and footprint requirements differ. Verify pinout compatibility between SC-70 and SOT-563 packages if physical substitution is considered.