MCP45HV31-503E/MQ

Digital Potentiometers Overview

The MCP45HV31-503E/MQ is a single-channel, 7-bit digital potentiometer from Microchip Technology. It features an I2C serial interface and volatile memory. The device supports high-voltage analog operation with a terminal voltage range of +36V (DGND = V-) or ±18V (DGND = V- + 18V). The nominal resistance (RAB) is 50 kΩ with a tolerance of ±20%. It provides 128 taps for resolution. The wiper current support is 6.5 mA for the 50 kΩ variant. Operating voltages include 1.8V to 5.5V for the digital supply (VL) and 10V to 36V for the analog supply (V+).

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: +36V terminal voltage range relative to V-, or ±18V relative to DGND.
• I2C Serial Interface: Supports standard (100 kHz), fast (400 kHz), fast mode plus (1.7 MHz), and high speed (3.4 MHz).
• 7-Bit Resolution: 128 taps with linear taper and volatile wiper memory.
• Shutdown Capability: Terminal disconnect via SHDN pin or TCON register.

Digital Potentiometers Applications

• Industrial control systems requiring high-voltage signal adjustment.
• Power management circuits needing programmable gain or reference settings.
• Test and measurement equipment utilizing isolated or high-side sensing.
• Audio processing applications involving high-voltage pre-amplification stages.

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'MQ' corresponds to the VQFN-20 (5x5) package when sourcing. Confirm that the application design accommodates the volatile nature of the wiper memory, as settings are lost upon power cycle. Ensure the digital logic level (VL) meets the minimum requirement relative to the analog negative rail (V-).

Digital Potentiometers Selection Notes

Select this component over the MCP45HV51 if 7-bit resolution (128 taps) is sufficient, as it offers a smaller footprint in the VQFN-20 package. Ensure the system can handle the 50 kΩ nominal resistance and 6.5 mA maximum wiper current. Verify that the I2C bus speed requirements align with the supported frequencies up to 3.4 MHz.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with SPI interfaces (MCP41HVX1) and 8-bit resolutions (MCP45HV51). The '31' designation indicates 7-bit resolution, while '503' specifies the 50 kΩ resistance value. The 'E' denotes RoHS compliance, and '/MQ' identifies the VQFN-20 package type.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include MCP45HV51-503E/MQ for 8-bit resolution or MCP41HV31-503E/MQ for SPI interface compatibility. Cross-family replacements require verifying I2C addressability and voltage levels against other manufacturers' high-voltage digital potentiometers.