MCP4351T-502E/ML

Digital Potentiometers Overview

The MCP4351T-502E/ML is a quad digital potentiometer IC from Microchip Technology, featuring four independent 8-bit resistor networks with 257 taps. It utilizes volatile RAM for wiper settings and operates via a high-speed SPI serial interface supporting up to 10 MHz at VDD ≥ 2.7V. The device offers RAB resistance options including 5 kΩ (indicated by the '502' suffix) and supports both potentiometer and rheostat configurations. Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of 2 MHz for the 5 kΩ variant, and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Contains four independent 8-bit digital potentiometers with 257 taps each.
• SPI Interface: Supports high-speed read/write operations via SPI at frequencies up to 10 MHz (Modes 0,0 and 1,1).
• High Voltage Tolerance: Digital inputs (CS, SCK, SDI, RESET) tolerate voltages up to 12.5V, enabling split-rail applications.
• Terminal Disconnect: Features a Terminal Control (TCON) register to disconnect resistor network terminals.

Digital Potentiometers Applications

• Programmable gain amplifiers requiring precise resistance adjustment.
• Voltage reference trimming in precision measurement systems.
• Audio volume control or tone adjustment circuits.
• Bias voltage setting for operational amplifiers or sensors.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'T' indicates tape-and-reel packaging and '/ML' specifies the 20-lead QFN package. Confirm the '502' suffix corresponds to the 5 kΩ nominal resistance value. Ensure the system design accounts for volatile memory behavior upon power loss, as wiper settings are not retained without external non-volatile storage.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required in a single package. The 8-bit resolution provides 256 steps for fine adjustment. Choose the 5 kΩ variant for lower noise and higher bandwidth applications compared to higher resistance values. Ensure the host microcontroller supports the required SPI modes and that input signals do not exceed the 12.5V high-voltage tolerance limit on digital pins.

Digital Potentiometers Part Context

This part belongs to the MCP433X/435X family of 7/8-bit quad SPI digital potentiometers. The 'MCP4351' designation specifically denotes the 8-bit (257 tap) potentiometer configuration with volatile memory. It differs from the MCP4341/4361 series which feature non-volatile EEPROM memory and WiperLock technology.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include MCP4351-502E/ML (tube packaging) or MCP4351-502E/ST (TSSOP-20 package). For non-volatile requirements, consider the MCP4361-502E/ML. Verify pin compatibility and thermal performance when switching between QFN and TSSOP packages.