INA155E/2K5

Overview

The INA155E/2K5 is a single-channel rail-to-rail CMOS instrumentation amplifier from the Texas Instruments INA155 series. It operates on a supply voltage range of 2.7 V to 5.5 V with a typical quiescent current of 1.7 mA. Key electrical specifications include a gain bandwidth product of 550 kHz, a slew rate of 6.5 V/us, and a common-mode rejection ratio (CMRR) of 78 dB. The device features an input bias current of 50 pA and an input offset voltage of 1 mV. It offers fixed gains of 10 V/V or 50 V/V with a gain error of 0.05%. Housed in an 8-pin VSSOP package, it supports surface mount installation and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Rail-to-rail output capability for maximum dynamic range in low-voltage systems
• CMOS architecture providing high input impedance and low power consumption
• Fixed internal gain options of 10 V/V and 50 V/V simplify circuit design

Applications

• Battery-powered portable measurement instruments
• Low-voltage data acquisition systems
• Industrial process control signal conditioning

Procurement Notes

Verify the specific suffix 'E/2K5' against the manufacturer's official datasheet to confirm the tape-and-reel packaging quantity and moisture sensitivity level. Ensure the ordering part number matches the required gain configuration and package type. Cross-reference the RoHS status and lead times directly with authorized distributors or Texas Instruments documentation prior to procurement.

Selection Notes

Select this component when a single-supply instrumentation amplifier with rail-to-rail output is required. The 5.5 V maximum supply voltage limits its use in higher voltage industrial environments. Compare the 78 dB CMRR and 1 mV Vos against application requirements; if higher precision is needed, consider alternatives with lower offset voltages. Verify that the 1.7 mA operating current fits the system's power budget constraints.

Part Context

This part belongs to the INA155 family of rail-to-rail instrumentation amplifiers. It is designed for applications requiring high accuracy in low-voltage, battery-operated equipment. The E/2K5 designation indicates the commercial temperature grade and reel packaging format. It serves as a signal conditioning solution for transducers and sensors in compact electronic designs.

Replacement Considerations

Check for direct pin-compatible upgrades within the INA155 family or similar rail-to-rail instrumentation amplifiers from Texas Instruments. Verify that substitute parts maintain the 2.7 V to 5.5 V supply range and comparable gain accuracy.