AD8403WARZ50-REEL

Overview

The AD8403WARZ50-REEL is a quad-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It features four independent variable resistors with a nominal end-to-end resistance of 50 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 at rates up to 10 MHz. Each channel provides 8-bit resolution, allowing precise electronic adjustment of resistance values. The component is housed in a 24-lead SOIC package and is qualified for automotive applications.

Feature Summary

• Quad-channel architecture with four independent 50 kΩ variable resistors
• 256-position digital control with linear taper and ±1% channel-to-channel matching tolerance
• 3-wire SPI-compatible serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode draws less than 5 μA with hardware reset and shutdown pins

Applications

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

Procurement Notes

Verify the 'W' suffix indicates automotive qualification and the '50' suffix specifies the 50 kΩ resistance value. Confirm the 'REEL' designation corresponds to tape and reel packaging. Check current lifecycle status as automotive variants may have different availability than standard commercial versions.

Selection Notes

Select this part when four independent programmable resistors are required in a compact surface-mount package. Ensure the system voltage falls within the 2.7 V to 5.5 V range. Consider the 500 ppm/°C temperature coefficient and the specific wiper resistance characteristics if driving low-impedance loads directly.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. The AD8403 specifically provides the quad-channel configuration, distinguishing it from the single-channel AD8400 and dual-channel AD8402. All members share similar control logic and interface protocols.

Replacement Considerations

Direct replacements include other AD8403 variants with different resistance values (e.g., AD8403ARZ10 for 10 kΩ or AD8403ARZ100 for 100 kΩ). For non-automotive applications, standard commercial grade parts like AD8403ARZ50 may be suitable if automotive qualification is not strictly required.