INA253A3IPW

Overview

The INA253A3IPW is a high-voltage, bidirectional, zero-drift current-shunt monitor manufactured by Texas Instruments. It integrates a precision 2-mΩ shunt resistor with a tolerance of 0.1% maximum and 3-nH inductance. The device operates within a common-mode voltage range of -4 V to 80 V and supports a supply voltage between 2.7 V and 5.5 V. Key electrical specifications include a gain bandwidth product of 350 kHz, a common-mode rejection ratio (CMRR) of 125 dB, and an input bias current of 90 µA. It features a gain of 100 mA/V and operates over an extended temperature range from -40°C to +125°C.

Feature Summary

• Integrates a precision 2-mΩ shunt resistor with low inductance for accurate current sensing
• Provides bidirectional measurement capability with high common-mode voltage tolerance up to 80 V
• Features zero-drift architecture to minimize offset voltage errors over temperature and time

Applications

• High-side current sensing in automotive power distribution systems
• Motor control applications requiring precise bidirectional current monitoring
• Industrial power management circuits with PWM noise rejection needs

Procurement Notes

Verify the specific suffix IPW corresponds to the TSSOP-20 package when ordering. Confirm AEC-Q100 qualification status if automotive compliance is required. Ensure the integrated shunt resistor value matches system design requirements before integration. Check datasheet for thermal dissipation limits under continuous load conditions.

Selection Notes

Select this component when a compact solution integrating both the sense amplifier and shunt resistor is needed. The integrated 2-mΩ resistor simplifies PCB layout and reduces component count compared to discrete solutions. Consider the 80-V common-mode range for high-side applications in automotive or industrial environments where ground referencing is not feasible.

Part Context

The INA253 series belongs to Texas Instruments' family of high-voltage current-sense amplifiers. The A3 variant specifically distinguishes itself by including an internal 2-mΩ shunt resistor, unlike other variants that may require external shunts. This integration enhances accuracy by eliminating parasitic resistance effects associated with external components and PCB traces.

Replacement Considerations

INA253A2IPW is a comparable part within the same family but typically lacks the integrated shunt resistor or has different gain characteristics. Verify pin compatibility and functional equivalence before substitution. The INA240 series offers similar high-voltage capabilities but requires external shunt resistors.