X9C503SI

Overview

The X9C503SI is a single-channel digital potentiometer manufactured by Renesas Electronics Corporation, part of the XDCP series. It features a 50 kΩ end-to-end resistance with a linear taper and 100 tap points (99 resistive elements). The device utilizes a nonvolatile memory architecture to store wiper positions, enabling power-on recall. It operates on a single 5V supply (4.5V to 5.5V range) and communicates via a three-wire interface consisting of CS, U/D, and INC pins. The component is housed in an 8-SOIC package and supports industrial temperature ranges.

Feature Summary

• Nonvolatile Memory: Stores wiper position data for retention during power cycles.
• Three-Wire Interface: Controlled via Chip Select (CS), Up/Down (U/D), and Increment (INC) inputs.
• High Resolution: 100 discrete tap points provide precise resistance adjustment.
• Linear Taper: Offers uniform resistance distribution across the wiper travel.

Applications

• Digitally controlled resistance trimming in calibration circuits.
• Programmable gain control in signal processing chains.
• Adjustable voltage reference generation for comparators.
• Offset voltage error correction in amplifier circuits.

Procurement Notes

Verify the specific suffix 'SI' against the manufacturer's current datasheet to confirm the extended industrial temperature range (-40°C to +85°C) compared to commercial variants. Ensure the ordering information matches the required tape-and-reel or tube packaging format, as availability varies by distributor channel. Cross-reference the RoHS compliance status with the latest environmental declarations.

Selection Notes

Select this component when nonvolatile storage of the resistance setting is required without external memory. The 50kΩ value suits moderate impedance applications; verify input impedance requirements against the 40Ω typical wiper resistance. Confirm that the 3-wire serial interface aligns with the host controller's GPIO capabilities. Consider the ±20% tolerance if high precision is critical.

Part Context

The X9C503SI belongs to the X9C102/103/104/503 family of digitally controlled potentiometers originally developed by Intersil and now produced by Renesas. This family shares a common control logic and pinout, differing primarily in total resistance values. The 'SI' designation typically indicates the industrial temperature grade variant within the SOIC-8 package lineup.

Replacement Considerations

Direct pin-compatible replacements include other members of the X9C10x family, such as the X9C104 (100kΩ) or X9C103 (10kΩ), provided the resistance value meets circuit requirements. Verify that substitute components support the same 3-wire interface and nonvolatile memory behavior.