MCP45HV51T-502E/ST

Digital Potentiometers Overview

The MCP45HV51T-502E/ST is a single-channel, volatile digital potentiometer from Microchip Technology. It features an 8-bit resolution with 256 taps and a nominal resistance (R_AB) of 5 kΩ. The device supports high-voltage analog operation with a terminal voltage range up to +36V relative to V-, or ±18V in dual-rail configurations. It utilizes an I²C serial interface for control and operates on a digital supply voltage (VL) ranging from 1.8V to 5.5V. Key electrical characteristics include a typical wiper resistance of 75 Ω, a maximum wiper current of 25 mA, and an extended operating temperature range from -40°C to +125°C.

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 standard (100 kHz), fast (400 kHz), and high-speed modes (up to 3.4 MHz).
• Write Latch (WLAT) Pin: Allows controlled updating of the volatile wiper register to prevent glitches during transitions.
• Extended Temperature Range: Designed for operation between -40°C and +125°C.

Digital Potentiometers Applications

• Industrial process control systems requiring high-voltage signal adjustment.
• Power management circuits involving variable gain or reference voltage tuning.
• Test and measurement equipment needing precise digital attenuation.
• Audio processing applications utilizing zero-crossing update capabilities.

Digital Potentiometers Procurement Notes

Verify that the specific ordering suffix 'T' corresponds to tape-and-reel packaging if required by automated assembly processes. Confirm that the '502' code accurately specifies the 5 kΩ resistance value for the application. Ensure the system design accommodates the separate analog (V+/V-) and digital (VL/DGND) power domains as specified in the datasheet.

Digital Potentiometers Selection Notes

Select this component when high-voltage analog signals up to 36V must be digitally controlled via I²C. The 5 kΩ resistance value is suitable for moderate current loads up to 25 mA. Consider the volatile memory nature; if non-volatile storage is required after power loss, alternative models within the family should be evaluated. Ensure the digital logic level (VL) meets the minimum requirement relative to the negative analog rail (V-).

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit or 8-bit) and resistance values (5k, 10k, 50k, 100k). The 'HV' designation indicates high-voltage analog support. The 'T' suffix typically denotes reel packaging, while '/ST' indicates the TSSOP-14 package type. Other family members may offer SPI interfaces or non-volatile memory options.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include MCP45HV51-502E/ST (tube packaging) or other resistance variants like MCP45HV51-103E/ST (10 kΩ) if resistance scaling is acceptable. For non-volatile requirements, consider the MCP46HV51 series. Verify pin compatibility and voltage ratings before substituting.