AD8403ARU100-REEL

Overview

The AD8403ARU100-REEL is a quad-channel, 256-position digital potentiometer in a TSSOP-24 package. It operates on a single supply of 2.7 V to 5.5 V with a nominal resistance of 100 kΩ and ±20% tolerance. The device features an SPI-compatible serial interface with a 10 MHz update rate. Key electrical parameters include a 500 ppm/°C temperature coefficient, less than 5 μA shutdown current, and a −65 dB crosstalk specification.

Feature Summary

• Quad-channel architecture with 256 tap positions per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO
• Hardware reset (RS) and power shutdown (SHDN) control pins
• Extended industrial operating temperature range from -40°C to +125°C

Applications

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

Procurement Notes

Verify the 'U' suffix indicates the TSSOP-24 package and '100' denotes the 100 kΩ resistance value. Confirm RoHS compliance status as specifications may vary by manufacturing site. Check for automotive qualification requirements if deploying in vehicle environments.

Selection Notes

Select this component when four independent variable resistors are required in a compact surface-mount footprint. Ensure the 100 kΩ nominal resistance fits the circuit impedance requirements. Verify that the volatile memory behavior aligns with system initialization protocols, as wiper positions are random upon power-up.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digitally controlled variable resistors. The AD8403 variant specifically provides four channels, distinguishing it from the single-channel AD8400 and dual-channel AD8402. All variants share identical serial interface logic and switching characteristics.

Replacement Considerations

Public confirmed substitute part numbers: AD8403ARZ100-REEL.