AD8403ARUZ1-REEL

Overview

The AD8403ARUZ1-REEL is a quad-channel, 8-bit digital potentiometer from Analog Devices. It provides four independent variable resistors with 256 tap positions and a nominal resistance of 1 kΩ. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V. It features an SPI-compatible 3-wire serial interface for data input and includes a power shutdown mode consuming less than 5 μA. The component is housed in a 24-lead TSSOP package and is rated for operation over an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Quad-channel architecture with four independent 8-bit variable resistors
• SPI-compatible 3-wire serial interface with daisy-chain capability via SDO pin
• Power shutdown mode reduces current consumption to under 5 μA
• Nominal resistance of 1 kΩ with ±1% channel-to-channel matching tolerance

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 'RUZ' corresponds to the TSSOP-24 package and lead-free (Z) construction as per the manufacturer's ordering guide. Confirm that the '-REEL' designation indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the required serial communication protocol levels for the target system.

Selection Notes

Select this component when four independent digitally controlled resistors are required in a compact surface-mount package. The 1 kΩ value is suitable for low-power applications where minimal current draw is critical. Consider the 256-position resolution for precise analog adjustments. Verify that the 2.7 V to 5.5 V supply range aligns with the system's power rails and that the serial interface timing meets the microcontroller's specifications.

Part Context

This part 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. The 'ARU' prefix denotes the automotive-grade qualification and TSSOP-24 package type, distinguishing it from standard commercial variants or other package options like SOIC or PDIP.

Replacement Considerations

Direct functional substitutes within the same family include the AD8403ARZ100-REEL for higher resistance values or the AD8403AR1 for alternative packaging. Cross-family replacements such as the AD5204 require verification of pinout compatibility and serial interface differences.