MCP41HV51-502E/MQ

Digital Potentiometers Overview

The MCP41HV51-502E/MQ is a single-channel, high-voltage digital potentiometer from Microchip Technology. It features an 8-bit resolution with 256 taps and a nominal resistance of 5 kΩ. The device supports dual power rails, allowing analog terminal voltages up to +36V relative to V-, while the digital interface operates on a separate supply (VL) ranging from 1.8V to 5.5V. It utilizes a standard SPI serial interface for control and contains volatile memory for wiper settings. Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of approximately 480 kHz at mid-scale, and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Operates with analog terminal voltages up to +36V relative to V-, enabling ±18V dual-rail configurations.
• Dual Power Rails: Separate analog (V+/V-) and digital (VL/DGND) supplies allow flexible logic interfacing independent of high-voltage levels.
• SPI Interface: Compatible with standard SPI modes (0,0 and 1,1) with clock frequencies up to 10 MHz.
• Write Latch (WLAT): Dedicated pin allows synchronization of volatile wiper register updates to specific system conditions.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated or high-voltage signal conditioning.
• Programmable gain amplifiers and variable attenuators in test and measurement equipment.
• Motor control circuits involving high-side or floating load adjustments.
• Audio processing equipment utilizing logarithmic taper options for volume control.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'MQ' corresponds to the VQFN-20 (5x5 mm) package when sourcing components. Confirm that the '-502' designation matches the required 5 kΩ resistance value for the specific circuit design. Ensure the application accounts for the volatile nature of the memory, as wiper positions will reset upon power loss unless managed by external logic.

Digital Potentiometers Selection Notes

Select this component when high voltage tolerance on the resistor network terminals is required alongside low-voltage digital logic. The 5 kΩ value offers a balance between current handling capability (up to 25 mA) and power consumption. Consider the VQFN-20 package if board space is constrained, noting its thermal dissipation characteristics compared to the TSSOP-14 alternative.

Digital Potentiometers Part Context

This part belongs to the MCP41HVX1 family, which includes variants with different resolutions (7-bit/8-bit) and interfaces (SPI/I2C). The 'HV' designation specifically indicates the high-voltage analog support capabilities distinct from standard low-voltage digital potentiometers. The '51' suffix denotes the 8-bit resolution variant within this series.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include the MCP41HV31 (7-bit resolution) or the MCP45HV51 (I2C interface). For pin-compatible alternatives with different packages, consider the TSSOP-14 version (MCP41HV51-502E/ST). Verify that any substitute maintains the required +36V analog terminal rating and SPI compatibility.