AD8402ARZ100-REEL

Overview

The AD8402ARZ100-REEL is a dual-channel, 8-bit digital potentiometer manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a nominal resistance of 100 kΩ with a temperature coefficient of 500 ppm/°C. The device provides 256 tap positions controlled via a 3-wire SPI-compatible serial interface. It includes a power shutdown mode drawing less than 5 μA and an active-low reset pin that forces the wiper to midscale.

Feature Summary

• Dual-channel variable resistor architecture with 256 programmable positions
• SPI-compatible 3-wire serial interface supporting daisy-chaining
• Power shutdown capability reducing current consumption below 5 μA
• Active-low hardware reset (RS) pin for immediate midscale initialization

Applications

• Mechanical potentiometer replacement in automated systems
• Programmable filters, delays, and time constant adjustments
• Line impedance matching circuits
• Power supply voltage adjustment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for automotive qualification requirements if applicable to the target environment. Ensure proper ESD handling procedures are followed during storage and assembly due to the sensitivity of CMOS input structures.

Selection Notes

Select this model when a dual-channel configuration with 100 kΩ nominal resistance is required. Verify that the system logic levels align with the specified VIH and VIL thresholds at the operating voltage. Consider the 500 ppm/°C temperature coefficient for thermal stability requirements and ensure the SOIC-14 package dimensions fit the PCB layout constraints.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. The AD8402 specifically houses two independent variable resistors within a space-saving surface-mount package. The suffix '100' denotes the 100 kΩ resistance value, while 'ARZ' indicates the industrial temperature range and lead-free packaging.

Replacement Considerations

Direct replacements within the same family include the AD8402AR10 (10 kΩ), AD8402AR50 (50 kΩ), and AD8402AR1 (1 kΩ). These variants share identical pinouts and control interfaces but differ in nominal resistance values.