INA155E/250

Overview

The INA155E/250 is a single-channel, single-supply instrumentation amplifier manufactured by Texas Instruments. It features rail-to-rail CMOS output and operates within a supply voltage range of 2.7 V to 5.5 V. Key electrical parameters 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 offers fixed gains of 10 V/V or 50 V/V with a gain error of 0.05%. Input characteristics include an input bias current of 50 pA and an input offset voltage of 1 mV. It consumes 1.7 mA of operating current and is housed in an 8-VSSOP package.

Feature Summary

• Single-supply operation with rail-to-rail CMOS output capability
• High-speed performance with 550 kHz gain bandwidth product
• Low input bias current for high-impedance source applications

Applications

• Battery-powered sensor signal conditioning
• Industrial process control systems
• Medical instrumentation front ends

Procurement Notes

Verify the specific suffix 'EA/250' against the manufacturer's official datasheet to confirm pinout, thermal specifications, and moisture sensitivity level. Ensure the ordering part number matches the required gain configuration and package variant. Cross-reference with authorized distributors to validate authenticity and traceability documentation before purchase.

Selection Notes

Select this component when a single-supply instrumentation amplifier with rail-to-rail output is required. It is suitable for applications needing moderate speed (550 kHz BW) and low power consumption (1.7 mA). Consider the fixed gain options of 10 V/V or 50 V/V if external gain-setting resistors are undesirable. The 8-VSSOP package is appropriate for space-constrained surface-mount designs.

Part Context

The INA155 belongs to Texas Instruments' family of single-supply instrumentation amplifiers designed for cost-sensitive and battery-operated applications. It integrates precision matched resistors internally to set gain, eliminating the need for external components. This series targets industrial and consumer electronics where small form factor and low power are critical constraints.

Replacement Considerations

Check for direct replacements within the INA155 family or similar TI instrumentation amplifiers with compatible gain and package. Verify that any substitute maintains the 2.7 V to 5.5 V supply range and 8-VSSOP footprint. Confirm electrical parameter equivalence for CMRR, slew rate, and input bias current.