AD8400AR100-REEL

Overview

The AD8400AR100-REEL is a single-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It features a nominal end-to-end resistance of 100 kΩ with a ±20% tolerance and a temperature coefficient of 500 ppm/°C. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and consumes less than 5 μA in power shutdown mode. It utilizes a 3-wire SPI-compatible serial interface with a maximum clock rate of 10 MHz for data loading. The component is housed in an SOIC-8 surface-mount package and is qualified for automotive applications.

Feature Summary

• Single-channel digital potentiometer with 256 tap positions
• Nominal resistance of 100 kΩ with linear taper
• SPI-compatible 3-wire serial interface supporting 10 MHz clock rates
• Power shutdown current less than 5 μA

Applications

• Mechanical potentiometer replacement
• Programmable filters, delays, and time constants
• Line impedance matching
• Power supply adjustment

Procurement Notes

Verify the specific suffix 'REEL' indicates tape and reel packaging when sourcing. Confirm the '100' designation corresponds to the 100 kΩ resistance variant. Ensure compatibility with the required industrial temperature range of -40°C to +125°C for the intended environment.

Selection Notes

Select this part for single-channel applications requiring high resistance values up to 100 kΩ. Note that the 100 kΩ version has a lower bandwidth (71 kHz at -3 dB) compared to lower resistance variants. Ensure the design accounts for the monotonic output guarantee and the specific wiper contact resistance characteristics under load.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8402 offers dual channels and the AD8403 provides four channels, the AD8400 specifically integrates a single variable resistor into a compact SOIC-8 package, optimizing space for single-channel designs.

Replacement Considerations

Direct functional substitutes within the same family include other AD8400 variants with different resistance values (e.g., AD8400AR1, AD8400AR10, AD8400AR50). For quad-channel requirements, the AD8403 series may be considered if pinout compatibility allows.