INA821IDRGT

Instrumentation, Op Amps, Buffer Amps Overview

The INA821IDRGT is a precision instrumentation amplifier from Texas Instruments, featuring a low input offset voltage of 35 µV maximum and a noise density of 7 nV/√Hz. It operates on a single supply from 4.5 V to 36 V or dual supplies up to ±18 V, with a quiescent current of 650 µA maximum. The device offers a gain range of 1 to 10,000 set by a single external resistor, achieving a bandwidth of 4.7 MHz at unity gain. Input protection extends to ±40 V, and it maintains high common-mode rejection ratios across the specified temperature range of –40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Super-beta input transistors provide ultra-low input offset voltage, drift, bias current, and noise for high-precision signal conditioning.
• Integrated overvoltage protection safeguards inputs against damage from signals up to ±40 V.
• High common-mode rejection ratio ensures accurate differential measurements even in noisy environments.
• Stable operation is maintained with capacitive loads up to 1 nF without requiring additional compensation components.

Instrumentation, Op Amps, Buffer Amps Applications

• Analog input modules
• Flow transmitters
• Electrocardiogram (ECG) systems
• Process analytics including pH and gas sensing

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify that the ordering suffix 'DRGT' corresponds to the specific WSON package and tape-and-reel quantity required for your assembly line. Confirm the datasheet revision matches your design specifications, as thermal characteristics and pinout details may vary between package options like SOIC, VSSOP, and WSON. Ensure compatibility with your PCB footprint before finalizing procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when designing circuits requiring high accuracy with minimal power consumption. It is suitable for battery-operated devices due to its low quiescent current. Consider the wide supply voltage range if interfacing with various logic levels. The high CMRR makes it ideal for bridge sensor applications where common-mode noise rejection is critical for signal integrity.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the INA821 family of precision instrumentation amplifiers. It shares core architectural features with variants like the INA821ID and INA821IDGKT but differs in packaging and reel configuration. The family is designed for general-purpose precision applications, offering a balance of performance and power efficiency compared to higher-speed or lower-power specialized alternatives.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The INA821IDGKT serves as a direct functional replacement with identical electrical characteristics, differing only in the VSSOP package and reel format. Other members of the INA821 family, such as the INA821ID, offer the same performance in an SOIC package. Verify pin compatibility and thermal requirements when substituting between package types.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the voltage gain configured for the INA821?

The voltage gain is set by a single external resistor connected between the RG pins (Pin 2 and Pin 3). The gain equation is G = 1 + (49.4 kΩ / RG).

What is the maximum input overvoltage the device can withstand?

The inputs are protected against overvoltage up to ±40 V, allowing safe operation even if the input signal exceeds the supply rails within this limit.

Is the INA821 stable with capacitive loads?

Yes, the device is optimized to be stable with capacitive loads up to 1 nF without requiring additional series isolation resistors.