INA105KU/2K5G4

Overview

The INA105KU/2K5G4 is a precision monolithic difference amplifier manufactured by Texas Instruments. It integrates a laser-trimmed thin-film resistor network with low-noise, low-drift bipolar amplifiers to achieve high performance in a compact SOIC-8 package. The device provides a fixed gain of 1 V/V and supports dual supplies ranging from ±5V to ±18V or single supplies up to 36V. Key electrical characteristics include a maximum input offset voltage of 50 µV, a typical common-mode rejection ratio of 92 dB at DC, and a bandwidth of 1 MHz. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated laser-trimmed thin-film resistor network for high accuracy
• Low noise and low drift bipolar amplifier architecture
• Fixed unity gain configuration simplifies circuit design
• High common-mode rejection ratio across wide frequency range

Applications

• Precision current shunt monitoring
• Bridge sensor signal conditioning
• Medical instrumentation front ends
• Industrial process control systems
• Data acquisition systems requiring differential input

Procurement Notes

Verify the specific suffix 'G4' against the latest manufacturer datasheet to confirm lead-free status and RoHS compliance details. Ensure the SOIC-8 package dimensions match your PCB footprint requirements. Confirm that the fixed gain of 1 V/V meets your system's signal level requirements without additional amplification stages.

Selection Notes

Select this component when a fixed unity gain difference amplifier is required with high CMRR and low offset voltage. It is suitable for applications where space is limited and external resistor matching is undesirable. Consider alternative parts if variable gain or higher bandwidth is needed, as this device offers a fixed 1 V/V gain and 1 MHz bandwidth.

Part Context

The INA105 is part of Texas Instruments' legacy precision amplifier portfolio, designed to replace discrete resistor networks in difference amplifier configurations. The 'KU' designation indicates the SOIC-8 surface-mount package, while '/2K5' specifies the tape and reel packaging quantity. This series is widely used in industrial and medical applications requiring reliable, high-accuracy signal processing.

Replacement Considerations

Official substitutes may include other TI precision difference amplifiers such as the INA101 or INA102, which offer different fixed gains. For pin-compatible alternatives, verify the package type and electrical specifications carefully. Cross-reference with Analog Devices parts like the AD629 only if functional equivalence is confirmed through detailed parameter comparison.

FAQ

What is the fixed voltage gain of the INA105KU/2K5G4?

The INA105KU/2K5G4 has a fixed voltage gain of 1 V/V (unity gain).

What is the maximum supply voltage for the INA105KU/2K5G4?

The device supports a maximum supply voltage of 36V, which can be provided as dual supplies (±18V) or a single supply.

What is the typical common-mode rejection ratio (CMRR) at DC?

The typical CMRR at DC is 92 dB, with a minimum guaranteed value specified in the datasheet.