AD5171BRJZ5-R7

Overview

The AD5171BRJZ5-R7 is a 64-position, one-time programmable (OTP) digital potentiometer from Analog Devices. It utilizes fuse link technology to permanently set the resistance value after unlimited adjustments. The device features an I2C-compatible interface and operates within a supply voltage range of 2.7 V to 5.5 V. Key electrical parameters include a nominal resistor tolerance of ±30%, a wiper resistance of 60 Ω typical, and a maximum supply current of 10 μA. It supports end-to-end resistances of 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ, with a temperature coefficient of 35 ppm/°C in rheostat mode.

Feature Summary

• One-time programmable (OTP) memory using fuse link technology for permanent resistance setting
• I2C-compatible 2-wire serial interface with full read/write capability for the wiper register
• Automotive temperature range operation from −40°C to +125°C
• Compact 8-lead SOT-23 package with low power consumption (10 μA max)

Applications

• System calibrations requiring fixed resistance values
• Mechanical trimmer and potentiometer replacements
• Automotive electronics adjustments
• Gain control and offset adjustments in signal conditioning circuits

Procurement Notes

Verify the specific resistance value suffix (e.g., BRJZ5 indicates 5 kΩ) against design requirements. Confirm that the OTP programming infrastructure can provide the required 4.75 V to 5.25 V supply during the initial setup phase. Ensure the application does not require post-programming reconfiguration, as the fuse blow command is irreversible.

Selection Notes

Select this component when a cost-effective, non-volatile resistance setting is needed without the complexity of external EEPROM. The 6-bit resolution provides 64 tap positions. Consider the ±30% absolute tolerance if precise resistance values are critical; otherwise, use potentiometer mode for better ratiometric accuracy. Verify that the I2C bus speed requirements do not exceed 400 kHz.

Part Context

The AD5171 belongs to the AD517x family of digital potentiometers. The 'BRJZ' designation typically refers to the automotive grade (-40°C to +125°C) and the SOT-23-8 package. The '5' in the part number specifies the 5 kΩ end-to-end resistance variant. The '-R7' suffix denotes the reel packaging format used for surface-mount assembly.

Replacement Considerations

Direct functional substitutes within the same OTP category include other AD517x variants with different resistance values or packages. For applications not requiring OTP, volatile digital potentiometers like the AD5160 or AD5171's non-OTP counterparts may be considered, though they lack the permanent fuse-setting feature.