MCP45HV31T-104E/MQ

Digital Potentiometers Overview

The MCP45HV31T-104E/MQ is a single-channel, 7-bit volatile digital potentiometer from Microchip Technology. It features an I2C serial interface and supports high-voltage analog operation with a terminal voltage range of +36V relative to V-. The device offers a nominal resistance (RAB) of 100 kΩ with 128 taps. Digital logic operates on VL (1.8V to 5.5V), while the analog supply V+ ranges from 10V to 36V. It includes a Write Latch (WLAT) pin for controlled updates, shutdown capabilities via SHDN, and operates within an extended temperature range of -40°C to +125°C in a VQFN-20 (5x5 mm) package.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage with separate digital/analog power rails.
• I2C Serial Interface: Supports standard modes including 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz.
• Write Latch Control: WLAT pin allows synchronization of wiper register updates to specific conditions like zero crossing.
• Extended Temperature Range: Rated for operation from -40°C to +125°C.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated or high-side resistance adjustment.
• Sensor signal conditioning circuits utilizing variable gain or offset trimming.
• Power supply feedback networks for voltage regulation in high-voltage environments.

Digital Potentiometers Procurement Notes

Verify the 'MQ' suffix confirms the VQFN-20 (5x5 mm) package type. Confirm the '104' code corresponds to the 100 kΩ resistance value. Ensure the 'T' indicates tape-and-reel packaging if required by assembly equipment. Check that the 'E' suffix denotes the extended industrial temperature grade (-40°C to +125°C).

Digital Potentiometers Selection Notes

Select this component when a single digital potentiometer with high-voltage tolerance (+36V) is needed. The 7-bit resolution provides 128 steps, suitable for applications not requiring fine 8-bit precision. Use the I2C interface if system bus resources are limited compared to SPI. Ensure the analog supply voltage meets the minimum 10V requirement for specified performance.

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 MCP45HV31 specifically denotes the 7-bit I2C version. Other family members include the MCP45HV51 (8-bit I2C) and MCP41HV31 (7-bit SPI). All share similar high-voltage analog characteristics and pinouts where applicable.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include the MCP45HV51T-104E/MQ (8-bit resolution) if higher precision is acceptable. For SPI interfaces, the MCP41HV31T-104E/MQ is compatible but requires interface adaptation. Verify package compatibility as other variants may use TSSOP-14 packages.