MCP4361-104E/ST

Digital Potentiometers Overview

The MCP4361-104E/ST is a quad-channel digital potentiometer IC featuring non-volatile memory and WiperLock technology. It provides four independent 8-bit resistor networks with 257 taps, configured as potentiometers with a nominal resistance of 100 kΩ. The device operates on a supply voltage ranging from 2.7V to 5.5V and communicates via a high-speed SPI serial interface supporting up to 10 MHz. Key features include hardware and software write protection, terminal disconnect capabilities, and high-voltage tolerant digital inputs up to 12.5V.

Digital Potentiometers Feature Summary

• Quad Potentiometer Configuration: Four independent 8-bit channels with 257 taps and 100 kΩ nominal resistance.
• Non-Volatile Memory: Stores wiper settings using EEPROM with WiperLock technology for automatic recall upon power-up.
• SPI Interface: Supports 10 MHz operation in modes 0,0 and 1,1 with high-voltage tolerant inputs (up to 12.5V).
• Protection Features: Includes hardware write protect (WP) pin, software configuration bits, and brown-out reset.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifiers and sensor signal conditioning
• Voltage reference trimming and calibration systems
• Industrial process control requiring precise analog adjustments

Digital Potentiometers Procurement Notes

Verify the specific package variant, as the datasheet lists TSSOP-14, TSSOP-20, and QFN-20 options. Confirm that the 'E' suffix denotes the extended temperature range (-40°C to +125°C) and the '/ST' suffix corresponds to the correct physical package type required for your PCB layout. Ensure compatibility with the 100 kΩ resistance value specified by the '-104' code.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required in a single package. The 8-bit resolution offers 256 steps, suitable for applications not requiring fine-grained adjustment. Verify that the system supports SPI communication and that the 100 kΩ resistance fits within the circuit's current and impedance constraints. Consider the MCP4362 if rheostat configuration is preferred over potentiometer mode.

Digital Potentiometers Part Context

This part belongs to the MCP434X/436X family of quad digital potentiometers. The MCP4361 specifically distinguishes itself from the MCP4341 by offering 8-bit resolution (257 taps) compared to the 7-bit resolution (129 taps) of the MCP4341. Both share similar non-volatile memory and SPI interface characteristics but differ in step count and precision.

Digital Potentiometers Replacement Considerations

The MCP4341-104E/ST is a compatible alternative if 7-bit resolution (129 taps) is sufficient for the application. For rheostat configurations, the MCP4362-104E/ST serves as a direct functional substitute with identical electrical specifications but different terminal usage.

Digital Potentiometers FAQ

What is the maximum frequency for the SPI interface?

The SPI interface supports clock frequencies up to 10 MHz when the supply voltage is between 2.7V and 5.5V.

How does WiperLock technology function?

WiperLock technology automatically saves the current wiper setting to non-volatile memory during normal operation and recalls it upon power-up or after a brown-out event, ensuring the device returns to its previous state.

Can the digital input pins tolerate voltages higher than VDD?

Yes, the CS, SDI, SCK, WP, and RESET pins are high-voltage tolerant and can withstand up to 12.5V, even when VDD is lower.