AD5173BRMZ2.5

Overview

The AD5173BRMZ2.5 is a dual-channel, 256-position digital potentiometer from Analog Devices featuring one-time programmable (OTP) memory via fuse link technology. It operates on a single supply of 2.7 V to 5.5 V with a maximum supply current of 6 µA. The device provides an end-to-end resistance of 2.5 kΩ and includes two independent channels within a compact 10-lead MSOP package. Key electrical parameters include a nominal resistor tolerance of ±20%, a temperature coefficient of 35 ppm/°C, and a typical wiper resistance of 160 Ω. It supports I²C communication and offers additional address decode pins for multi-device configurations.

Feature Summary

• Dual-channel architecture with 256 tap positions per channel
• One-time programmable (OTP) fuse link technology for permanent setting retention
• I²C-compatible serial interface with full read/write capability for the wiper register
• Extra address decode pins (AD0, AD1) allowing multiple devices on the same bus
• Power-on preset to midscale with optional temporary OTP overwrite feature

Applications

• Systems calibration requiring permanent factory PCB settings
• Replacement for mechanical trimmers in new designs
• Transducer adjustment for pressure, temperature, position, chemical, and optical sensors
• RF amplifier biasing circuits
• Gain control and offset adjustment in electronic systems

Procurement Notes

Verify the specific ordering suffix matches the required resistance value and package type. Confirm that the design supports the external voltage requirement (5.6 V to 5.8 V) necessary for the OTP programming phase. Ensure the application does not require post-programming adjustments, as the fuse blow command is irreversible. Check for ESD sensitivity precautions during handling and assembly.

Selection Notes

Select the AD5173 over the AD5172 if multiple devices need to share the I²C bus, as it includes dedicated AD0 and AD1 pins for hardware address decoding. Choose this component when non-volatile storage is required without the cost of EEPROM. Verify that the 2.5 kΩ resistance aligns with the circuit's impedance requirements and that the 256-position resolution meets the precision needs of the application.

Part Context

This part belongs to the AD5172/AD5173 family of 256-position, one-time programmable digital potentiometers. The AD5173 variant is distinguished by its additional address pins compared to the single-address AD5172. Both utilize thin-film technology for low temperature coefficients and fuse link memory to retain settings after power loss, serving as solid-state alternatives to mechanical variable resistors.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.