AD8403AR1-REEL

Overview

The AD8403AR1-REEL is a quad-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It replaces mechanical potentiometers with a compact SOIC-24 surface-mount package. The device features four independent channels with a nominal end-to-end resistance of 1 kΩ and ±20% tolerance. It operates on a single 2.7 V to 5.5 V supply and utilizes a 3-wire SPI-compatible serial interface for data loading at rates up to 10 MHz. Key electrical characteristics include a wiper resistance of 100 Ω at 5 V, a bandwidth of 5 MHz, and an operating temperature range of −40°C to +125°C.

Feature Summary

• Quad-channel architecture with 256-tap resolution per channel
• 1 kΩ nominal resistance with ±20% tolerance
• SPI-compatible 3-wire serial interface with SDO daisy-chain support
• Power shutdown current less than 5 μA

Applications

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

Procurement Notes

Verify the specific suffix 'R1' against official documentation to confirm the 1 kΩ resistance value and SOIC-24 packaging. Ensure compatibility with the required voltage levels and thermal management for the industrial temperature range.

Selection Notes

Select this component when a low-resistance digital variable resistor is needed for high-bandwidth applications. The 1 kΩ value provides a 5 MHz bandwidth, significantly higher than the 10 kΩ or 100 kΩ variants. Ensure the load current does not exceed the continuous terminal current limits specified in the datasheet.

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 provides four independent channels in a 24-lead package, suitable for multi-channel signal conditioning systems.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD8403ARZ10 (10 kΩ), AD8403ARZ50 (50 kΩ), and AD8403ARZ100 (100 kΩ). Verify that the system design can accommodate the different resistance values and resulting bandwidth changes.