AD8403AN1

Overview

The AD8403AN1 is a quad-channel, 8-bit digital potentiometer manufactured by Analog Devices. It features four independent variable resistors with linear taper and 256 tap positions per channel. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and draws a maximum operating current of 900 µA. It utilizes a 3-wire serial interface compatible with SPI for data input. The unit is housed in a 24-pin SOIC-Wide package and supports an industrial temperature range from -40°C to +125°C.

Feature Summary

• Quad-channel configuration with 256-position variable resistance
• 1 kΩ nominal resistance value with ±20% tolerance
• Volatile brush memory requiring power-up initialization
• 10 MHz update data loading rate via 3-wire serial interface

Applications

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

Procurement Notes

Verify component status as the AD8403AN1 is listed as End-of-Life (EOL) in public distributor records. Confirm availability through authorized channels or secondary markets. Check RoHS compliance status, as some listings indicate non-compliance for this specific suffix variant. Validate datasheet revision against manufacturing date codes.

Selection Notes

Select this part for applications requiring four independent 1 kΩ digital pots in a wide SOIC package. Ensure system design accounts for volatile memory behavior, as wiper settings are lost upon power loss. Verify that the 3-wire serial interface timing meets the host controller's clock requirements. Consider thermal management within the specified -40°C to +125°C operating range.

Part Context

The AD8403AN1 belongs to the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. This specific model represents the quad-channel variant with 1 kΩ resistance. Other variants in the series include different resistance values (10 kΩ, 50 kΩ, 100 kΩ) and packaging options such as SOIC-8 or SOIC-16.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate cross-references based on pin compatibility, resistance tolerance, and interface protocol.