AD8403ARUZ100-REEL

Overview

The AD8403ARUZ100-REEL is a quad-channel, 256-position digital potentiometer from Analog Devices. It features four independent variable resistors with a nominal end-to-end resistance of 100 kΩ and a linear taper. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes a 3-wire SPI-compatible serial interface for data input. Each channel provides 8-bit resolution, allowing precise resistance adjustment between the wiper and terminal A or B. The component is housed in a 24-lead TSSOP surface-mount package and is designed for extended industrial temperature operation.

Feature Summary

• Quad-channel architecture with four independent 100 kΩ variable resistors
• 256-position (8-bit) resolution with linear taper
• 3-wire SPI-compatible serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode with current consumption less than 5 μA

Applications

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

Procurement Notes

Verify the specific suffix 'U' indicates the TSSOP-24 package variant when sourcing. Confirm RoHS compliance status as manufacturing sites may vary. Check for automotive qualification requirements if the application demands AEC standards, as standard industrial versions differ from qualified automotive parts.

Selection Notes

Select this part for applications requiring four independent digitally controlled resistors with high end-point values. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V supply range. Note that the internal latches are volatile; a hardware reset or initial software configuration is required upon power-up to set the wiper positions.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8402 provides dual channels, the AD8403 integrates four channels into a single package. The 'Z' suffix typically denotes lead-free packaging, and 'REEL' indicates tape-and-reel delivery format.

Replacement Considerations

Direct functional substitutes within the same family include AD8403ARZ100 (SOIC-24 package) or AD8403ARU10 (TSSOP-24, 10 kΩ). Cross-family replacements like the AD5204 offer similar functionality but may differ in interface protocols or electrical specifications.