AD8400AR50-REEL

Overview

The AD8400AR50-REEL is a single-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It features a nominal resistance of 50 kΩ with a linear taper and ±1% channel-to-channel matching tolerance. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and consumes less than 5 μA in power shutdown mode. It utilizes a 3-wire SPI-compatible serial interface for data input, supporting update rates up to 10 MHz. The component is housed in an SOIC-8 surface-mount package and is qualified for automotive applications, operating reliably within the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Single-channel 50 kΩ variable resistor with 256 programmable positions
• 3-wire SPI-compatible serial interface with 10 MHz clock rate
• Power shutdown current less than 5 μA
• Qualified for automotive applications

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official Ordering Guide to confirm the exact resistance value and packaging configuration. Ensure compatibility with existing PCB footprints for the SOIC-8 package. Confirm that the design accounts for the ESD sensitivity of the CMOS digital inputs during handling and assembly processes.

Selection Notes

Select this component when a single-channel digital potentiometer with a 50 kΩ nominal resistance is required. Verify that the system voltage falls within the 2.7 V to 5.5 V range. Consider the 500 ppm/°C temperature coefficient for thermal stability requirements. Ensure the application does not exceed the continuous terminal current limits specified in the Absolute Maximum Ratings table.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8400 variant specifically provides a single variable resistor channel, whereas the AD8402 offers dual channels and the AD8403 provides quad channels. All variants share similar electrical characteristics and interface protocols but differ in pin count and package options.

Replacement Considerations

Direct replacements include other AD8400 series parts with different resistance values or channel counts, such as AD8400AR10 or AD8400AR100, provided the pinout and electrical specifications match the design requirements.