AD5170BRM100

Overview

The AD5170BRM100 is a single-channel, 256-position digital potentiometer manufactured by Analog Devices. It features an end-to-end resistance of 100 kΩ with a tolerance of ±55% and a temperature coefficient of 35 ppm/°C. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V, drawing a maximum supply current of 6 µA. It utilizes a two-wire I²C-compatible serial interface for control and includes programmable address decode pins (AD0, AD1). The component is housed in a compact 10-lead MSOP package.

Feature Summary

• Two-time programmable (TTP) fuse link technology allows permanent resistance setting after unlimited volatile adjustments.
• I²C-compatible 2-wire serial interface with full read/write capability for the wiper register.
• Power-on preset to midscale ensures a known initial state upon startup.
• Wide operating temperature range from −40°C to +125°C.

Applications

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

Procurement Notes

Verify the specific suffix '100' indicates the 100 kΩ resistance variant, as the datasheet lists standard options as 2.5 kΩ, 10 kΩ, and 50 kΩ. Confirm package availability and lead times with authorized distributors. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS inputs and fuse structures.

Selection Notes

Select this model when a high-resistance digital potentiometer (100 kΩ) is required for low-current applications. Verify that the system power supply can provide the necessary voltage levels for I²C communication. Consider the 100 mA OTP programming current requirement if permanent fuse blowing is needed; an external supply may be required if the main VDD cannot support this transient load.

Part Context

The AD5170 series comprises 256-position digital potentiometers available in multiple resistance values. The BRM100 variant specifically denotes the 100 kΩ version within the AD5170 family. These devices are designed to replace mechanical potentiometers in applications requiring solid-state reliability and precise electronic adjustment without physical wear.

Replacement Considerations

Direct substitutes include other AD5170 variants such as AD5170BRMZ50 (50 kΩ), AD5170BRMZ10 (10 kΩ), and AD5170BRMZ2.5 (2.5 kΩ) if resistance value differences are acceptable. Ensure pin compatibility and I²C address configurations match the existing design constraints.