MCP4651T-103E/ST

Digital Potentiometers Overview

The MCP4651T-103E/ST is a dual-channel digital potentiometer manufactured by Microchip Technology. It features two independent 8-bit resistor networks, providing 257 adjustable taps for precise resistance control. The nominal end-to-end resistance (RAB) is 10 kΩ with a ±20% tolerance. Communication is handled via an I²C serial interface supporting standard, fast, and high-speed modes up to 3.4 MHz. The device operates on a supply voltage (VDD) ranging from 1.8V to 5.5V and utilizes volatile RAM memory to store wiper positions. It is housed in a 14-pin TSSOP surface-mount package.

Digital Potentiometers Feature Summary

• Dual 8-bit Potentiometer Configuration: Contains two independent resistor networks with 257 steps each.
• I²C Serial Interface: Supports 100 kHz, 400 kHz, and 3.4 MHz clock frequencies for high-speed read/write operations.
• Wide Operating Voltage: Functional operation from 1.8V to 5.5V; analog characteristics specified from 2.7V to 5.5V.
• High-Voltage Tolerant Inputs: Digital inputs (HVC/A0, A1, A2, SCL, SDA) tolerate voltages up to 12.5V.

Digital Potentiometers Applications

• Programmable gain amplifiers requiring precise resistance adjustment.
• Voltage reference trimming and calibration circuits.
• Audio volume control and tone adjustment systems.
• Variable biasing for analog sensors and signal conditioning.

Digital Potentiometers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the '103' code corresponds to the 10 kΩ resistance value required for the design. Ensure the 'E' suffix meets environmental compliance standards if applicable to the project specifications.

Digital Potentiometers Selection Notes

Select this component when dual-channel resolution is required without non-volatile storage needs. The volatile memory implies that wiper settings are lost upon power loss; designs must re-initialize values after reset. Compare against MCP4652 if rheostat configuration is preferred over potentiometer pinouts.

Digital Potentiometers Part Context

This part belongs to the MCP465X family within the broader MCP45XX/MCP46XX series of I²C digital potentiometers. It shares the same core architecture as the MCP4652 but differs in terminal configuration, offering potentiometer pinouts instead of rheostat configurations. It is distinct from the MCP4661, which includes EEPROM for non-volatile memory retention.

Digital Potentiometers Replacement Considerations

The MCP4652 serves as a functional alternative if rheostat configuration is acceptable. For single-channel applications, the MCP4551 provides equivalent electrical performance in an 8-pin MSOP package. Verify pin compatibility and software register mapping when substituting these devices.