MCP45HV31-502E/ST

Digital Potentiometers Overview

The MCP45HV31-502E/ST is a single-channel, 7-bit digital potentiometer from Microchip Technology. It features an I²C serial interface and volatile memory for wiper settings. The device supports high-voltage analog operation with a terminal voltage range of +36V (DGND = V-) or ±18V (DGND = V- + 18V). The analog supply operates from 10V to 36V, while the digital supply ranges from 1.8V to 5.5V. It offers a nominal resistance of 5 kΩ with 128 taps, a typical wiper resistance of 75 Ω, and a bandwidth of 500 kHz.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage relative to V-, enabling dual-rail ±18V operation relative to digital ground.
• I²C Serial Interface: Supports standard modes including 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz clock speeds.
• Write Latch (WLAT) Pin: Allows synchronization of volatile wiper register updates to specific conditions, such as zero-crossing events.
• Extended Temperature Range: Rated for operation from -40°C to +125°C.

Digital Potentiometers Applications

• Industrial control systems requiring high-voltage signal conditioning
• Power management circuits with isolated analog domains
• Test and measurement equipment needing precise resistance adjustment

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'E' indicates RoHS compliance and 'ST' denotes the TSSOP-14 package. Confirm that the application design accommodates the volatile nature of the memory, as wiper settings are lost upon power loss. Ensure the digital logic level (VL) meets the minimum requirement relative to the analog negative rail (V-).

Digital Potentiometers Selection Notes

Select this component when a single-channel digital potentiometer with high-voltage tolerance is required. The 7-bit resolution provides 128 taps, suitable for applications not demanding 8-bit precision. Compare against the MCP45HV51 if 8-bit (256 tap) resolution is necessary. Ensure the system can handle the separate analog and digital power rails.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit vs. 8-bit) and interfaces (I²C vs. SPI). The '31' designation specifically identifies it as a 7-bit I²C device. Other family members include the MCP45HV51 (8-bit I²C) and MCP41HV31 (7-bit SPI).

Digital Potentiometers Replacement Considerations

For direct pin-compatible replacement with identical functionality, consider the MCP45HV31-502E/MQ in the VQFN-20 package. For higher resolution requirements within the same interface, the MCP45HV51-502E/ST is available. Verify that any substitute maintains the +36V analog support capability.