MCP4651-502E/ST

Digital Potentiometers Overview

The MCP4651-502E/ST is a dual-channel digital potentiometer IC manufactured by Microchip Technology. It features two independent 8-bit resistor networks, providing 257 taps per channel with a nominal end-to-end resistance of 5 kΩ (±20% tolerance). The device operates on an I²C serial interface and utilizes volatile memory to store wiper settings. Key electrical parameters include a typical wiper resistance of 75 Ω, a supply voltage range of 1.8V to 5.5V for operation, and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual 8-bit Potentiometer Configuration: Contains two independent channels with 257 discrete taps each.
• I²C Serial Interface: Supports Standard Mode (100 kHz), Fast Mode (400 kHz), and High-Speed modes up to 3.4 MHz.
• High-Voltage Tolerant Inputs: Digital inputs (HVC/A0, A1, A2) tolerate voltages up to 12.5V.
• Terminal Disconnect Feature: Allows disconnection of resistor network terminals via the Terminal Control (TCON) register.

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference adjustment
• Audio volume control

Digital Potentiometers Procurement Notes

Verify the specific resistance code suffix in the part number against the datasheet table. The '502' designation corresponds to a 5 kΩ nominal resistance. Confirm that the required package type matches the ST (TSSOP-14) variant listed in the documentation.

Digital Potentiometers Selection Notes

Select this component when a dual-channel digital potentiometer with low resistance values is required. Ensure the system supports the I²C protocol and that volatile memory behavior aligns with the application's power-loss requirements. Verify that the 5 kΩ resistance fits the target circuit impedance constraints.

Digital Potentiometers Part Context

This component belongs to the MCP46XX family of dual resistor network devices. It shares the same pinout and core architecture as other variants in the series, differing primarily in resolution (7-bit vs. 8-bit), memory type (RAM vs. EEPROM), and resistance value options.

Digital Potentiometers Replacement Considerations

MCP4651-102E/ST (10 kΩ)

Digital Potentiometers FAQ

What is the resolution of the MCP4651?

The MCP4651 has an 8-bit resolution, providing 256 resistors and 257 steps per channel.

Does the MCP4651 retain settings after power loss?

No, the MCP4651 uses volatile RAM memory. Wiper settings are lost when power is removed.

What is the maximum voltage allowed on the digital input pins?

The HVC/A0, A1, and A2 pins are high-voltage tolerant and can withstand up to 12.5V with respect to VSS.