AD5173BRM50

Overview

The AD5173BRM50 is a dual-channel, 256-position, one-time programmable (OTP) digital potentiometer from Analog Devices. It features an I2C-compatible interface and operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device employs fuse link technology for permanent resistance setting retention. Key electrical parameters include a nominal end-to-end resistance of 50 kΩ, a temperature coefficient of 35 ppm/°C, and a maximum supply current of 6 µA. It is housed in a compact 10-lead MSOP package measuring 3 mm × 4.9 mm.

Feature Summary

• Dual-channel architecture with 256 tap positions per channel
• One-time programmable (OTP) fuse link technology for permanent settings
• I2C-compatible serial interface with extra address decode pins (AD0, AD1)
• Low power consumption with 6 µA maximum supply current

Applications

• Systems calibration
• Electronics level setting
• Mechanical trimmer replacement in new designs
• Permanent factory PCB settings
• Transducer adjustment for pressure, temperature, position, chemical, and optical sensors

Procurement Notes

Verify the specific suffix 'BRM50' against official documentation to confirm the 50 kΩ resistance value and commercial grade temperature range. Confirm that the OTP programming requirements are met, specifically the need for a separate 5.6 V to 5.8 V supply capable of driving 100 mA during the one-time programming phase. Ensure ESD precautions are observed due to the sensitivity of the device.

Selection Notes

Select the AD5173 over the AD5172 if multiple devices require unique I2C addressing via the dedicated AD0 and AD1 pins. Choose this component when non-volatile memory retention is required without the cost of EEPROM. Verify that the 50 kΩ resistance value aligns with the circuit's impedance requirements and that the 256-position resolution is sufficient for the application's precision needs.

Part Context

The AD5173 belongs to the AD517x family of digital potentiometers, which utilize fuse link technology to provide a cost-effective alternative to electrically erasable memory (EEMEM). This family allows for unlimited adjustments prior to OTP activation and includes a temporary overwrite feature for dynamic adjustments after programming. The AD5173 specifically distinguishes itself within the series by offering two independent channels and additional hardware address pins for multi-device systems.

Replacement Considerations

The AD5172BRM50 is a compatible single-channel alternative within the same family. For applications requiring higher resolution or different interfaces, consider the AD5175 series (1024-position) or the AD5161 series (SPI/I2C compatible). Ensure any substitute matches the 10-lead MSOP package dimensions and I2C timing specifications.