AD8403ARU10-REEL

Overview

The AD8403ARU10-REEL is a quad-channel, 256-position digital potentiometer from Analog Devices. It operates on a single 2.7 V to 5.5 V supply and features an SPI-compatible serial interface with a 10 MHz update rate. The device contains four independent variable resistors in a 24-lead TSSOP package. Each channel offers linear taper with a nominal resistance of 10 kΩ and ±20% tolerance. Key electrical parameters include a 600 kHz bandwidth for the 10 kΩ version, less than 5 μA shutdown current, and operation across an extended temperature range of −40°C to +125°C.

Feature Summary

• Quad-channel architecture with 256 tap positions per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces supply current to under 5 μA
• Hardware reset (RS) forces wipers to midscale; SHDN pin controls open-circuit state

Applications

• Mechanical potentiometer replacement in industrial systems
• Programmable filters, delays, and time constants
• Line impedance matching and power supply adjustment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated in specific lot documentation. Check for automotive qualification requirements if deploying in vehicle environments. Ensure ESD precautions are observed during handling due to CMOS sensitivity.

Selection Notes

Select this model for applications requiring four independent digitally controlled resistors in a compact surface-mount package. The 10 kΩ value suits moderate impedance circuits, while the TSSOP-24 form factor aids space-constrained designs. Consider the volatile memory nature, which requires initialization upon power-up, and verify that the 10 MHz clock speed aligns with system timing constraints.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8403 specifically provides four channels, whereas the AD8400 offers one and the AD8402 offers two. All variants share similar control logic and electrical characteristics, differing primarily in channel count and package options such as SOIC or PDIP.

Replacement Considerations

Direct substitutes within the same family include AD8403ARZ10-REEL (RoHS compliant variant) and AD8403AR10-REEL (SOIC-24 package). Cross-family replacements require verifying channel count, resistance value, and package footprint compatibility.