AD8403AR100-REEL

Overview

The AD8403AR100-REEL is a quad-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It operates on a single 2.7 V to 5.5 V supply and features a 3-wire SPI-compatible serial interface with a 10 MHz update rate. Each channel provides a nominal end-to-end resistance of 100 kΩ with a ±1% channel-to-channel matching tolerance and a temperature coefficient of 500 ppm/°C. The device includes power shutdown functionality drawing less than 5 μA, an active-low reset pin for midscale positioning, and an open-drain SDO pin supporting daisy-chain configurations.

Feature Summary

• Quad-channel architecture with 256 programmable positions per VR
• Nominal 100 kΩ resistance with ±1% inter-channel matching
• SPI-compatible 3-wire serial interface operating up to 10 MHz
• Power shutdown mode with current consumption below 5 μA

Applications

• Mechanical potentiometer replacement in industrial systems
• Programmable filters, delays, and time constants
• Line impedance matching circuits
• Power supply adjustment controls

Procurement Notes

Verify the specific package type associated with the AR suffix against the manufacturer's ordering guide, as the AD8403 family utilizes multiple packages including SOIC-24 and TSSOP-24. Confirm that the REEL designation matches the required tape and reel quantity for production integration. Ensure compatibility with the system's voltage levels for the SPI interface logic.

Selection Notes

Select this component when four independent variable resistors are required within a single footprint. The 100 kΩ value suits applications requiring higher impedance levels compared to the 1 kΩ or 10 kΩ variants. Note that the wiper contact resistance increases at lower supply voltages; verify that the continuous current limits for the 100 kΩ version (±540 μA) meet the load requirements of the target circuit.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8402 offers dual channels, the AD8403 integrates four independent channels. The '100' in the model number specifies the 100 kΩ resistance value, distinguishing it from other resistance options like 1 kΩ, 10 kΩ, or 50 kΩ available in the same series.

Replacement Considerations

Direct functional substitutes within the same family include AD8403ARZ100-REEL (SOIC-24 package) and AD8403ARU100-REEL (TSSOP-24 package). Verify that the physical package dimensions and pinout of the replacement match the PCB layout, as package variations exist across the AD8403 product line.