AD8403ARZ100

Overview

The AD8403ARZ100 is a quad-channel, 8-bit digital potentiometer from Analog Devices. It provides four independent variable resistors with 256 tap positions in a 24-lead SOIC package. The nominal resistance is 100 kΩ with a temperature coefficient of 500 ppm/°C and ±20% tolerance. It operates on a single supply voltage between 2.7 V and 5.5 V. Control is via a 3-wire SPI-compatible serial interface supporting up to 10 MHz clock rates. The device includes a shutdown mode consuming less than 5 μA and an active-low reset pin for mid-scale initialization.

Feature Summary

• Quad-channel architecture with 256-position resolution
• 100 kΩ nominal resistance with linear taper
• SPI-compatible 3-wire serial interface with daisy-chain capability
• Microwatt power shutdown state (<5 μA)
• Extended industrial temperature range (-40°C to +125°C)

Applications

• Mechanical potentiometer replacement
• Programmable filters and time constants
• Volume control and panning circuits
• Line impedance matching

Procurement Notes

Verify the specific suffix 'Z' indicates RoHS compliance when sourcing. Confirm the '100' designation corresponds to the 100 kΩ resistance value. Check current lifecycle status as older revisions may be obsolete. Ensure the SOIC-24 package matches the PCB footprint requirements.

Selection Notes

Select this component for applications requiring four independent digitally controlled resistors. The 100 kΩ value suits high-impedance signal paths. Verify that the volatile memory behavior aligns with system power-loss requirements. Ensure the 2.7 V to 5.5 V supply range covers the target operating voltage.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8403 specifically denotes the quad-channel variant. Other variants include the single-channel AD8400 and dual-channel AD8402. All share similar electrical characteristics and interfaces but differ in channel count and package options.

Replacement Considerations

Direct substitutes within the same family include AD8403ARZ50 (50 kΩ) or AD8403ARZ10 (10 kΩ). For different channel counts, consider AD8402 or AD8400. Cross-manufacturer replacements require verification of pin compatibility and electrical specifications.