MCP4642T-103E/UN

Digital Potentiometers Overview

The MCP4642T-103E/UN is a dual-channel digital potentiometer IC featuring nonvolatile memory and an I²C serial interface. It provides two independent rheostat configurations, each with 7-bit resolution offering 128 taps (129 steps). The nominal resistance between terminals A and B is 10 kΩ with a ±20% tolerance. The device operates within a supply voltage range of 2.7V to 5.5V for specified characteristics, supporting standard, fast, and high-speed I²C modes up to 3.4 MHz. It includes WiperLock™ technology for securing calibration settings in EEPROM.

Digital Potentiometers Feature Summary

• Dual Rheostat Configuration: Two independent resistor networks with 7-bit resolution (128 taps) per channel.
• Nonvolatile Memory: Features WiperLock™ technology to automatically recall saved wiper settings upon power-up.
• I²C Interface: Supports 100 kHz, 400 kHz, and 3.4 MHz clock frequencies with hardware write protect capabilities.
• High-Voltage Tolerant Inputs: Digital inputs tolerate voltages up to 12.5V, allowing operation with higher analog supplies.

Digital Potentiometers Applications

• Precision gain control in instrumentation amplifiers
• Calibration of sensor signal conditioning circuits
• Adjustable reference voltage generation
• Audio volume or tone control systems

Digital Potentiometers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm the 'E' suffix denotes RoHS compliance and lead-free finish. Ensure the 'UN' suffix corresponds to the MSOP-10 package variant. Cross-reference the full part number against the manufacturer's current datasheet revision to confirm active status and pinout compatibility.

Digital Potentiometers Selection Notes

Select this component when dual isolated variable resistors are required without mechanical wear. The 10 kΩ value suits moderate impedance applications; lower values like 5 kΩ offer higher bandwidth but consume more current. Verify that the 7-bit resolution meets the system's adjustment granularity needs. Ensure the I²C address pins (A0-A2) can be configured to avoid bus conflicts in multi-device designs.

Digital Potentiometers Part Context

This part belongs to the MCP46XX family of dual I²C digital potentiometers. It shares the same core architecture as the volatile MCP4632 but adds nonvolatile EEPROM storage. It differs from the MCP4641 by providing two rheostats instead of one potentiometer. The 'T' suffix distinguishes it from bulk-packaged versions, indicating reel-based manufacturing for automated assembly.

Digital Potentiometers Replacement Considerations

Direct functional substitutes include other MCP4642 variants with different resistance values (e.g., MCP4642-502E/UN for 5 kΩ) or packages. For single-channel applications, the MCP4542 series may be considered if only one rheostat is needed. Ensure any replacement maintains the same 7-bit resolution and nonvolatile memory features if power-down retention is critical.