MCP4642T-104E/UN

Digital Potentiometers Overview

The MCP4642T-104E/UN is a dual-channel digital potentiometer IC from Microchip Technology, featuring nonvolatile memory and an I2C serial interface. It provides two independent rheostat configurations with 100 kΩ resistance (R_AB) and 7-bit resolution, offering 129 discrete taps. The device operates within a supply voltage range of 2.7V to 5.5V for specified characteristics, extending to 1.8V for serial interface operation only. Key features include WiperLock™ technology for securing calibration settings, high-voltage tolerant digital inputs up to 12.5V, and a typical wiper resistance of 75 Ω. It supports standard, fast, and high-speed I2C modes.

Digital Potentiometers Feature Summary

• Dual Rheostat Configuration: Two independent resistor networks with 100 kΩ nominal resistance and 7-bit (129-step) resolution.
• Nonvolatile Memory: Includes EEPROM for wiper settings and 10 general-purpose memory locations; retains data without power via WiperLock™ technology.
• I2C Serial Interface: Supports 100 kHz, 400 kHz, and 3.4 MHz clock speeds with hardware and software write protect capabilities.
• High-Voltage Tolerance: Digital input pins (HVC/A0, A1, A2, SCL, SDA, WP) tolerate voltages up to 12.5V.

Digital Potentiometers Applications

• Precision gain control in audio and instrumentation amplifiers
• Calibration of sensor signal conditioning circuits
• Adjustable reference voltage generation
• System configuration storage requiring power-down retention

Digital Potentiometers Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging when ordering. Confirm the 'E' suffix denotes RoHS compliance and lead-free finish. Ensure the 'UN' suffix matches the required 10-pin MSOP package. Cross-reference the full part number against the manufacturer's current datasheet DS22107B to confirm active status and pinout compatibility before procurement.

Digital Potentiometers Selection Notes

Select this model for applications requiring two isolated variable resistors with persistent settings. The 100 kΩ value suits moderate impedance circuits; lower values like 5 kΩ or 10 kΩ are available in the same family if higher current handling is needed. The 7-bit resolution provides 128 steps; consider the 8-bit variants (MCP4662) if finer adjustment is required. Ensure the system I2C bus speed does not exceed 3.4 MHz and that voltage levels on digital inputs remain within the 12.5V tolerance.

Digital Potentiometers Part Context

This component belongs to the MCP46XX family of dual digital potentiometers. It shares the same core architecture as the MCP4641 (potentiometer config) and MCP4662 (8-bit resolution), differing primarily in the rheostat pinout, bit depth, and specific resistance value indicated by the '-104' code. The 'T' suffix distinguishes it from tube-packaged versions like the MCP4642-104E/UN.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same package include the MCP4642-104E/UN (tube pack) or other -104E/UN variants if packaging differs. For 8-bit resolution upgrades, the MCP4662T-104E/UN is compatible. Single-channel equivalents like the MCP4542T-104E/UN require circuit redesign due to pinout differences.