MCP41HV31-502E/MQ

Digital Potentiometers Overview

The MCP41HV31-502E/MQ is a single-channel digital potentiometer from the MCP41HVX1 family, manufactured by Microchip Technology. It features an SPI serial interface and volatile memory for wiper position storage. The device supports high-voltage analog operation with a terminal voltage range of +36V (DGND = V-) or ±18V (DGND = V- + 18V). The analog supply operates between 10V and 36V, while the digital supply ranges from 1.8V to 5.5V. It provides 7-bit resolution with 128 taps and offers RAB resistance options including 5kΩ. Key electrical characteristics include a typical wiper resistance of 75Ω, a bandwidth of 500kHz at 5kΩ, and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage relative to V-, enabling dual-rail ±18V operation relative to digital ground.
• SPI Serial Interface: Supports 10 MHz clock speeds in Modes 0,0 and 1,1 for fast read/write operations to the volatile wiper register.
• Write Latch (WLAT) Pin: Allows synchronization of wiper updates to specific conditions, such as zero-crossing events, by inhibiting the latch until the pin is low.
• Extended Temperature Range: Designed for industrial applications with reliable performance across -40°C to +125°C.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated or high-side variable resistance.
• Motor control circuits utilizing rheostat configurations for gain adjustment.
• Sensor signal conditioning where high common-mode voltages are present.
• Test and measurement equipment needing programmable attenuation or biasing.

Digital Potentiometers Procurement Notes

Verify the package type matches the application requirements; the 'MQ' suffix indicates a VQFN-20 (5x5) package. Confirm that the system design accommodates the separate analog and digital power rails, as the device requires distinct V+/V- and VL/DGND supplies. Ensure the PCB layout supports the exposed pad thermal dissipation capabilities specified for the VQFN package.

Digital Potentiometers Selection Notes

Select this component when high-voltage analog terminals are required alongside standard logic-level digital control. The 7-bit resolution (128 taps) is suitable for applications not requiring fine 8-bit granularity. Consider the volatile memory nature; if power-down retention is needed, a non-volatile variant like the MCP41HV51 or a different family member should be evaluated instead.

Digital Potentiometers Part Context

This part belongs to the MCP41HVX1 family, which includes variants with I2C interfaces (MCP45HVX1) and 8-bit resolutions (MCP41HV51). The 'HV' designation highlights its capability for high-voltage analog signals independent of the digital logic level. The specific model combines the 7-bit resolution of the MCP41HV31 with the VQFN-20 packaging option.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include MCP41HV31T-502E/ST (TSSOP-14 package) or MCP41HV31-502E/ST. For 8-bit resolution, consider MCP41HV51-502E/MQ. Note that I2C-compatible devices like MCP45HV31 require interface adaptation.