AD8402ARZ10-REEL

Overview

The AD8402ARZ10-REEL is a dual-channel digital potentiometer from Analog Devices, featuring two independent 256-position variable resistors in an SOIC-14 package. It operates on a single 2.7 V to 5.5 V supply and accepts a 3-wire SPI-compatible serial interface with a 10 MHz update rate. The nominal resistance is 10 kΩ with ±1% channel-to-channel matching and a temperature coefficient of 500 ppm/°C. Key features include power shutdown drawing less than 5 μA, a reset pin for midscale positioning, and automotive qualification. The device replaces mechanical potentiometers in programmable filter, volume control, and impedance matching applications.

Feature Summary

• Dual-channel 256-position variable resistor architecture
• 10 kΩ nominal resistance with ±1% matching tolerance
• SPI-compatible 3-wire serial interface supporting daisy-chaining
• Power shutdown mode with <5 μA current consumption

Applications

• Mechanical potentiometer replacement
• Programmable filters and time constants
• Volume control and panning circuits
• Line impedance matching
• Power supply adjustment

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging suitable for automated assembly. Confirm the ARZ suffix corresponds to the industrial temperature range (-40°C to +125°C) and lead-free RoHS compliance. Ensure the '10' designation matches the required 10 kΩ resistance value for the specific circuit design.

Selection Notes

Select this component when a dual-channel digital solution is required. The 10 kΩ value offers a balance between bandwidth (600 kHz -3 dB) and noise performance. Consider the SOIC-14 package dimensions against board space constraints. Verify that the 2.7 V to 5.5 V supply range aligns with the system voltage rails and that the 3-wire interface is compatible with the host microcontroller.

Part Context

This part belongs to the AD840x family of digital potentiometers, which includes single-channel (AD8400), dual-channel (AD8402), and quad-channel (AD8403) variants. All members share similar electrical characteristics and serial interfaces but differ in channel count and package options. The AD8402 specifically provides two isolated channels in a compact surface-mount footprint.

Replacement Considerations

Direct functional substitutes within the same family include the AD8402ARZ50 (50 kΩ) and AD8402ARZ100 (100 kΩ). For single-channel needs, the AD8400 series may be used if only one channel is active. Quad-channel requirements should consider the AD8403 series.