MCP4651T-503E/ST

Digital Potentiometers Overview

The MCP4651T-503E/ST is a dual-channel digital potentiometer manufactured by Microchip Technology, housed in a 14-TSSOP surface-mount package. It features an I2C serial interface and volatile memory for wiper settings. The device provides two independent potentiometer circuits with 8-bit resolution, offering 257 discrete taps. Each channel has an end-to-end resistance (RAB) of 50 kΩ with a ±20% tolerance. The typical wiper resistance is 75 Ω. Operating voltage ranges from 1.8V to 5.5V, supporting standard, fast, and high-speed I2C modes up to 3.4 MHz.

Digital Potentiometers Feature Summary

• Dual-channel configuration with 8-bit (257 tap) resolution per potentiometer
• I2C serial interface supporting 100 kHz, 400 kHz, and 3.4 MHz clock speeds
• Terminal Control (TCON) register enables resistor network terminal disconnect
• High-voltage tolerant digital inputs capable of withstanding up to 12.5V

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifier configurations
• Voltage reference trimming and calibration
• Variable bias current generation in analog front-ends

Digital Potentiometers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing components. Confirm the '503' code corresponds to the 50 kΩ resistance value required for the design. Ensure the I2C bus speed requirements align with the device's support for up to 3.4 MHz operation at appropriate supply voltages.

Digital Potentiometers Selection Notes

Select this component when dual independent digital potentiometers are required within a single package. The volatile memory type necessitates re-initialization of wiper positions after power cycles. Verify that the 50 kΩ resistance range fits the application's impedance constraints compared to available 5 kΩ, 10 kΩ, or 100 kΩ variants.

Digital Potentiometers Part Context

This part belongs to the MCP465X family, which shares architectural similarities with the MCP455X series but offers dual channels instead of single. It differs from non-volatile counterparts like the MCP4661 by utilizing RAM rather than EEPROM for storage. The TSSOP-14 package allows for compact PCB layouts in space-constrained designs requiring dual-channel analog control.

Digital Potentiometers Replacement Considerations

MCP4651-503E/ST: Tube-packaged version of the same electrical specifications. MCP4651T-103E/ST: Identical functionality with 10 kΩ resistance. MCP4651T-104E/ST: Identical functionality with 100 kΩ resistance.