MCP41HV31-103E/MQ

Digital Potentiometers Overview

The MCP41HV31-103E/MQ is a single-channel digital potentiometer from Microchip Technology, housed in a VQFN-20 (5x5 mm) package. It features an 8-bit resolution with 256 taps and a nominal resistance of 10 kΩ. The device supports high-voltage analog operation with a terminal voltage range of +36V relative to V- or ±18V relative to DGND. Digital logic operates on a supply voltage (VL) ranging from 1.8V to 5.5V. Key specifications include a typical wiper resistance of 75 Ω, a bandwidth of 240 kHz at -3 dB, and volatile memory controlled via an SPI serial interface.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage range (DGND = V-) or ±18V (DGND = V- + 18V).
• SPI Interface: Compatible with standard SPI modes (0,0 and 1,1) operating up to 10 MHz.
• Write Latch Control: Includes a WLAT pin to inhibit volatile wiper register updates until the pin is low.
• Terminal Disconnect: Supports resistor network terminal disconnect via the SHDN pin or TCON register.

Digital Potentiometers Applications

• High-voltage sensor calibration and offset adjustment.
• Programmable gain amplifiers requiring isolated control rails.
• Industrial process control systems with floating ground references.
• Test and measurement equipment needing precise variable resistance under high potential.

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'MQ' corresponds to the VQFN-20 package when sourcing. Confirm that the application design accommodates the separate analog (V+/V-) and digital (VL/DGND) power domains required for high-voltage operation. Ensure the SPI controller supports the specified voltage levels for VL.

Digital Potentiometers Selection Notes

Select this component when a single digital potentiometer requires high common-mode voltage handling. The 10 kΩ value (-103) provides a balance between current handling capability (12.5 mA max) and noise immunity. Consider the MCP41HV51 if higher 8-bit resolution is not sufficient and 256 steps are required, though this model already offers 8-bit resolution; verify against the MCP41HV31's 7-bit counterpart if lower resolution is acceptable.

Digital Potentiometers Part Context

This part belongs to the MCP41HVX1 family, which includes variants like the MCP41HV31 and MCP41HV51. These devices are designed for applications where the digital control ground differs significantly from the analog signal ground. The 'E' indicates extended temperature range (-40°C to +125°C), and 'MQ' denotes the VQFN-20 package.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include the MCP41HV31T-103E/MQ (tape and reel version). For different packages, the TSSOP-14 variant is MCP41HV31-103E/ST. Ensure any substitute maintains the high-voltage analog support and SPI compatibility.