MCP4352-502E/ST

Digital Potentiometers Overview

The MCP4352-502E/ST is a quad rheostat digital potentiometer IC manufactured by Microchip Technology. It features four independent 8-bit resistor networks with 257 taps and a nominal resistance of 5 kΩ (±20%). The device utilizes an SPI serial interface supporting up to 10 MHz operation at VDD ≥ 2.7V. It operates on a supply voltage range of 1.8V to 5.5V, with high-voltage tolerant digital inputs up to 12.5V. Memory is volatile RAM, resetting wipers to mid-scale upon power-up or brown-out reset.

Digital Potentiometers Feature Summary

• Quad Rheostat Configuration: Four independent 8-bit resistor networks with 257 taps each.
• SPI Interface: Supports 10 MHz clock speeds in Modes 0,0 and 1,1 with high-voltage tolerant inputs (up to 12.5V).
• Wide Voltage Operation: Functional from 1.8V to 5.5V; analog characteristics specified from 2.7V to 5.5V.
• Terminal Disconnect: Features TCON registers to disconnect resistor network terminals.

Digital Potentiometers Applications

• Variable gain control in audio and RF signal processing chains.
• Programmable biasing for operational amplifiers and sensor circuits.
• Adjustable reference voltage generation in mixed-signal systems.
• Impedance matching networks requiring digital adjustment.

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E/ST' corresponds to the TSSOP-14 package and lead-free RoHS compliance as indicated in manufacturer documentation. Confirm that the application requires volatile memory behavior, as wiper settings are lost upon power loss. Ensure the system design accommodates the 1.8V minimum operating voltage if used below the 2.7V analog specification threshold.

Digital Potentiometers Selection Notes

Select this component when a quad rheostat configuration is required rather than a potentiometer setup. The 5kΩ resistance value suits applications needing moderate current handling with low thermal noise. Consider the MCP4351 if potentiometer mode (floating terminal B) is preferred, or the MCP4362 if non-volatile EEPROM memory is necessary to retain wiper positions after power cycles.

Digital Potentiometers Part Context

This part belongs to the MCP43X series of 7/8-bit digital potentiometers. The '52' designation specifically identifies it as a quad rheostat variant with 8-bit resolution (257 taps), distinguishing it from the MCP4351 (potentiometer) and MCP4332 (7-bit rheostat). It shares the same pinout and interface logic as other devices in the MCP433X/435X family.

Digital Potentiometers Replacement Considerations

The MCP4351 is a functional substitute if the circuit can be configured as a rheostat by leaving one terminal floating. For non-volatile requirements, the MCP4362 offers identical electrical characteristics but includes EEPROM memory. The MCP4332 provides similar functionality with lower 7-bit resolution.