MCP45HV51T-503E/MQ

Digital Potentiometers Overview

The MCP45HV51T-503E/MQ is a single-channel, 8-bit volatile digital potentiometer from Microchip Technology. It features a 50 kΩ end-to-end resistance (RAB) with 256 taps and linear taper. 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 VL (1.8V to 5.5V). It utilizes an I²C serial interface supporting speeds up to 3.4 MHz. Key features include a Write Latch (WLAT) pin for synchronized updates, shutdown capabilities via SHDN and TCON registers, and low wiper resistance (75 Ω typical). It is housed in a VQFN-20 (5x5 mm) package.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Terminal voltage range up to +36V (DGND = V-) or ±18V (DGND = V- + 18V).
• I²C Serial Interface: Supports 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz clock frequencies.
• Write Latch Function: WLAT pin inhibits volatile wiper register updates until driven Low, enabling zero-crossing synchronization.
• Shutdown Control: Resistor network terminals can be disconnected via the SHDN pin or TCON register.

Digital Potentiometers Applications

• Industrial control systems requiring high-voltage signal attenuation.
• Power management circuits with dual-rail supply configurations.
• Test and measurement equipment needing precise digital resistance adjustment.
• Audio processing applications utilizing the Write Latch feature for glitch-free transitions.

Digital Potentiometers Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging and 'MQ' denotes the VQFN-20 package. Confirm the '-503' code specifies the 50 kΩ resistance value. Ensure the design accounts for the separate analog (V+/V-) and digital (VL/DGND) power domains required for high-voltage operation.

Digital Potentiometers Selection Notes

Select this component when an 8-bit resolution (256 taps) is required for a 50 kΩ network. It is suitable for applications needing I²C communication and high common-mode voltages. Consider the volatile memory type; if non-volatile storage is needed, alternative models within the family must be selected. Verify that the system's digital logic voltage falls within the 1.8V to 5.5V range.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit/8-bit), interfaces (I²C/SPI), and resistance values. The MCP45HV51 specifically denotes the 8-bit I²C version. The 'T' suffix typically signifies reel packaging, while 'MQ' identifies the 5x5 mm VQFN package type.

Digital Potentiometers Replacement Considerations

Direct replacements within the same package and function include other MCP45HV51 variants with different resistance codes (e.g., -103E/MQ for 10kΩ). For non-volatile requirements, consider the MCP45HV52 series. Ensure any substitute maintains the 36V terminal voltage rating and I²C compatibility.