AD8402ARZ50

Overview

The AD8402ARZ50 is a dual-channel, 8-bit digital potentiometer from Analog Devices. It provides two independent variable resistors with a nominal resistance of 50 kΩ and 256 tap positions. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes an SPI-compatible 3-wire serial interface for data input. Key electrical characteristics include a typical wiper resistance of 100 Ω at 5 V, a temperature coefficient of 500 ppm/°C, and a power shutdown current of less than 5 μA. It is housed in a 14-lead SOIC package.

Feature Summary

• Dual-channel architecture with 256-position linear adjustment
• SPI-compatible 3-wire serial interface supporting daisy-chaining
• Power shutdown mode reduces current consumption below 5 μA
• Nominal resistance of 50 kΩ with ±1% channel-to-channel matching

Applications

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

Procurement Notes

Verify the specific suffix 'Z' indicates RoHS compliance and the 'AR' denotes the industrial temperature range (-40°C to +125°C) and SOIC-14 package. Confirm that the '50' suffix corresponds to the 50 kΩ nominal resistance value as defined in the manufacturer's ordering guide.

Selection Notes

Select this component when a dual-channel solution is required to replace mechanical pots in space-constrained designs. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Consider the 500 ppm/°C temperature coefficient if high precision over wide temperature variations is critical.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8403 provides four channels, the AD8402 specifically addresses applications requiring two independent variable resistors within a compact surface-mount footprint.

Replacement Considerations

Direct replacements within the same family include other resistance variants such as AD8402AR10 (10 kΩ) or AD8402AR100 (100 kΩ), provided the pinout and package dimensions remain identical.