AD8402ARU100

Digital Potentiometers Overview

The AD8402ARU100 is a dual-channel, 256-position digital potentiometer from Analog Devices Inc., housed in a 14-lead TSSOP surface-mount package. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features an SPI-compatible serial interface for data loading. The device provides two independent variable resistors with a nominal resistance of 100 kΩ and a linear taper. Key specifications include a typical wiper resistance of 200 Ω at 3 V operation, a temperature coefficient of 500 ppm/°C, and a power shutdown current of less than 5 μA.

Digital Potentiometers Feature Summary

• Dual-channel architecture with 256 programmable tap positions per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces supply current to under 5 μA
• Active-low reset (RS) forces wipers to midscale (80H)
• Extended industrial operating temperature range from -40°C to +125°C

Digital Potentiometers Applications

• Mechanical potentiometer replacement in space-constrained designs
• Programmable filters, delays, and time constant adjustments
• Line impedance matching and power supply voltage adjustment

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the package type and resistance value. Ensure compatibility with system voltage levels and serial clock speeds before integration. Check for automotive qualification requirements if applicable to the target environment.

Digital Potentiometers Selection Notes

Select this component when a dual-channel digital solution is required with a 100 kΩ nominal resistance. The TSSOP-14 package is suitable for applications requiring a low-profile surface-mount footprint. Consider the 200 Ω wiper resistance at lower supply voltages when designing load circuits.

Digital Potentiometers 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 designs needing two independent variable resistors within a compact form factor.

Digital Potentiometers Replacement Considerations

Direct substitutes within the same family include the AD8402ARZ100-REEL (tape and reel packaging) or the AD8402AN10 (PDIP through-hole package). Verify that the alternative package maintains the necessary thermal and mechanical constraints for the application.