MCP4661T-104E/ST

Digital Potentiometers Overview

The MCP4661T-104E/ST is a dual-channel, 8-bit nonvolatile digital potentiometer manufactured by Microchip Technology. It features two independent resistor networks with 257 taps and a nominal resistance of 100 kΩ (indicated by the '104' suffix). The device operates on a supply voltage range of 2.7V to 5.5V for specified characteristics, with operation down to 1.8V supported. It utilizes an I²C serial interface supporting standard, fast, and high-speed modes. Key specifications include a typical wiper resistance of 75 Ω, a temperature coefficient of 150 ppm/°C over the extended range, and an operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual-channel architecture with 8-bit resolution providing 257 discrete tap positions per channel.
• Nonvolatile EEPROM memory retains wiper settings upon power loss and includes WiperLock™ technology.
• I²C serial interface compatible with 100 kHz, 400 kHz, and 3.4 MHz clock speeds.
• High-voltage tolerant digital inputs allowing up to 12.5V on control pins while VDD is lower.

Digital Potentiometers Applications

• Precision gain adjustment in instrumentation amplifier circuits.
• Digital calibration of sensor offset and scale factors.
• Programmable voltage reference or bias level setting.
• Audio volume control and tone shaping applications.

Digital Potentiometers Procurement Notes

Verify the package marking and date code against the manufacturer's latest documentation to ensure authenticity. Confirm that the specific ordering suffix matches the required tape-and-reel quantity and moisture sensitivity level. Check for any recent obsolescence notices or lifecycle status updates directly from Microchip Technology before finalizing procurement plans.

Digital Potentiometers Selection Notes

Select this component when a dual-channel configuration with nonvolatile storage is required. Ensure the 100 kΩ resistance value aligns with the target circuit impedance. Verify that the system voltage remains within the 2.7V to 5.5V range for full electrical specification compliance. Consider the TSSOP-14 package dimensions if board space is constrained.

Digital Potentiometers Part Context

This part belongs to the MCP46XX family of digital potentiometers, which are designed for applications requiring precise, digitally controlled resistance adjustments. The 'T' suffix indicates a tape-and-reel packaging format suitable for automated surface-mount assembly processes. The '104' designation specifically denotes the 100 kΩ resistance value of the internal resistor networks.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include the MCP4661-104E/ST (tube packaging) or other variants in the MCP456X/MCP466X series with matching resistance and pinout configurations. Cross-family replacements require verification of I²C address compatibility and register mapping differences.