MCP45HV51-104E/MQ

Digital Potentiometers Overview

The MCP45HV51-104E/MQ is an 8-bit digital potentiometer IC from Microchip Technology, housed in a VQFN-20 (5x5 mm) package. It features a single resistor network with a nominal resistance of 100 kΩ and 256 taps. The device supports high-voltage analog operation with a terminal voltage range up to +36V relative to V-, or ±18V when DGND is offset by 18V. Digital logic operates on VL (1.8V to 5.5V), while the analog supply V+ ranges from 10V to 36V. It utilizes an I²C serial interface and includes volatile memory for wiper settings.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles terminal voltages up to +36V (DGND = V-) or ±18V (DGND = V- + 18V).
• Dual Power Rails: Separate analog (V+/V-) and digital (VL/DGND) supplies allow flexible system grounding.
• I²C Interface: Supports standard (100 kHz), fast (400 kHz), fast mode plus (1.7 MHz), and high-speed (3.4 MHz) modes.
• Write Latch Control: WLAT pin allows synchronization of volatile wiper register updates to specific conditions like zero crossing.

Digital Potentiometers Applications

• High-voltage sensor signal conditioning
• Industrial process control loop tuning
• Programmable gain amplifier biasing

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'MQ' corresponds to the VQFN-20 package and '104' indicates the 100 kΩ resistance value. Confirm that the 'E' suffix denotes compliance with RoHS standards and halogen-free requirements as specified in the manufacturer's documentation.

Digital Potentiometers Selection Notes

Select this component when an 8-bit resolution with 256 taps is required for precise resistance adjustment. Ensure the application voltage does not exceed the 36V differential limit between V+ and V-. Verify that the digital logic level (VL) meets the minimum requirement of 1.8V if operating with low-voltage microcontrollers.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which provides high-voltage digital potentiometers with I²C interfaces. The '51' designation identifies it as the 8-bit variant within the series, distinct from the 7-bit MCP45HV31. The '104' code specifies the 100 kΩ total resistance, while other options include 5 kΩ, 10 kΩ, and 50 kΩ.

Digital Potentiometers Replacement Considerations

The MCP45HV51T-104E/MQ is the tape-and-reel version of this component. For alternative packages, the MCP45HV51-104E/ST offers the same electrical specifications in a TSSOP-14 package.