MCP4632-503E/UN

Digital Potentiometers Overview

The MCP4632-503E/UN is a dual-channel digital potentiometer IC featuring volatile memory and an I²C serial interface. It provides two independent rheostat configurations with a nominal resistance (R_AB) of 50 kΩ and ±20% tolerance. The device utilizes 7-bit resolution, offering 128 resistors and 129 adjustment steps per channel. Key electrical specifications include a typical wiper resistance of 75 Ω, a supply voltage range of 1.8 V to 5.5 V, and an inactive serial interface current of 2.5 µA. It supports I²C clock frequencies up to 3.4 MHz and operates within an extended temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual resistor network with 7-bit resolution (129 steps) and 50 kΩ nominal resistance
• I²C serial interface supporting 100 kHz, 400 kHz, and 3.4 MHz modes
• Volatile memory configuration with zero-scale to full-scale wiper operation
• High-voltage tolerant digital inputs capable of withstanding up to 12.5 V

Digital Potentiometers Applications

• Programmable gain amplifiers requiring precise resistance adjustment
• Voltage reference trimming in measurement systems
• Digital control of analog signal paths via I²C bus
• Battery management system calibration circuits

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E/UN' corresponds to the MSOP-10 package and industrial temperature grade during sourcing. Confirm that the '503' designation indicates the 50 kΩ resistance value. Ensure compatibility with the target I²C address configuration using pins A0, A1, and A2. Check for moisture sensitivity levels if reflow soldering is required.

Digital Potentiometers Selection Notes

Select this component when dual independent rheostats are needed with volatile storage. The 50 kΩ value suits moderate impedance applications; lower values like 5 kΩ offer higher bandwidth. The 7-bit resolution provides 128 steps, which may be insufficient for high-precision linearization compared to 8-bit variants. Ensure the host controller supports the desired I²C speed, as 3.4 MHz requires strict PCB layout constraints.

Digital Potentiometers Part Context

This part belongs to the MCP45XX/MCP46XX family of single and dual I²C digital potentiometers. The '46' prefix denotes a dual-channel device, while '3' indicates 7-bit resolution. The '2' signifies a rheostat configuration. It shares the same core architecture and interface protocols with other members of the DS22096B specification, differing primarily in channel count, resolution, and resistance values.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include MCP4631-503E/UN (dual potentiometer) or MCP4652-503E/UN (dual rheostat, 8-bit). Cross-family replacements require verifying I²C compatibility and pinout alignment. Note that non-volatile memory variants (e.g., MCP4642) retain settings after power loss but operate on a 2.7 V minimum supply.