AD8403ARU1

Overview

The AD8403ARU1 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 TSSOP package. The nominal resistance is 1 kΩ with a ±20% tolerance and a temperature coefficient of 700 ppm/°C. It operates on a single supply voltage between 2.7 V and 5.5 V. Control is managed via a 3-wire SPI-compatible serial interface supporting data loading rates up to 10 MHz. The device includes a power shutdown mode consuming less than 5 μA.

Feature Summary

• Quad-channel architecture with 256-position resolution
• 1 kΩ nominal resistance with linear taper
• 3-wire SPI-compatible serial interface with daisy-chain capability
• Power shutdown current below 5 μA

Applications

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

Procurement Notes

Verify the specific suffix 'ARU1' against the manufacturer's ordering guide to confirm the 1 kΩ resistance value and TSSOP-24 package type. Ensure compatibility with automotive qualification requirements if applicable to the design. Check for end-of-life status or alternative sourcing options as availability may vary.

Selection Notes

Select this component when four independent digitally controlled resistors are required in a compact surface-mount footprint. The 1 kΩ value suits applications requiring lower impedance levels compared to the 10 kΩ, 50 kΩ, or 100 kΩ variants. Verify that the 256-step resolution meets the precision requirements for the intended analog signal path.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8402 offers dual channels, the AD8403 integrates four channels. All members share similar electrical characteristics and interface protocols but differ in pin count and physical package dimensions.

Replacement Considerations

Direct replacements within the same family include AD8403ARZ1 (SOIC-24) or AD8403ARZ10 (10 kΩ). Cross-family alternatives like the AD5204 require verification of pinout compatibility and electrical parameter alignment.