AD8403ARZ10

Overview

The AD8403ARZ10 is a quad-channel, 256-position digitally controlled variable resistor in a 24-lead SOIC package. It operates on a single 2.7 V to 5.5 V supply with a nominal end-to-end resistance of 10 kΩ and ±1% channel matching. The device uses a 3-wire SPI-compatible interface with a 10 MHz clock rate. Key features include a hardware reset pin for midscale positioning, a shutdown mode drawing less than 5 μA, and an SDO pin for daisy-chaining. It guarantees monotonic operation and minimizes switching glitches.

Feature Summary

• Quad-channel architecture with 256 independent taps per channel
• SPI-compatible serial interface supporting up to 10 MHz clock rates
• Hardware RS pin resets wipers to midscale (80H)
• SHDN pin enables low-power shutdown (<5 μA) while retaining settings

Applications

• Mechanical potentiometer replacement
• Programmable filters and time constants
• Line impedance matching

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm the package type and tape/reel specifications. Confirm RoHS compliance status as it may vary by production lot or revision. Ensure the source document matches the exact part number to avoid discrepancies in electrical characteristics.

Selection Notes

Select this component when four independent digital resistors are required in a compact surface-mount footprint. The 10 kΩ value offers a balance between bandwidth (600 kHz) and noise performance. Verify that the application voltage does not exceed the 5.5 V maximum rating and that the load current stays within the ±2.1 mA continuous limit.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. While sharing core functionality, the AD8403 specifically provides four channels in a 24-lead package, distinguishing it from the dual-channel AD8402 and single-channel AD8400.

Replacement Considerations

Direct replacements include other variants within the AD840x family such as the AD8402 for dual-channel needs or the AD8400 for single-channel applications. Cross-model substitution requires verifying pin compatibility and channel count requirements.