MCP41HV31T-502E/ST

Digital Potentiometers Overview

The MCP41HV31T-502E/ST is a single-channel, 7-bit volatile digital potentiometer from the MCP41HVX1 family. It features an SPI serial interface and supports high-voltage analog operation with a terminal voltage range of +36V (DGND = V-) or ±18V (DGND = V- + 18V). The device provides 128 taps with a nominal resistance of 5 kΩ. Digital logic operates on a supply voltage (VL) ranging from 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 and supports wiper currents up to 25 mA.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles terminal voltages up to +36V relative to V-, enabling dual-rail ±18V configurations.
• SPI Interface: Compatible with standard SPI modes (0,0 and 1,1) operating at frequencies up to 10 MHz.
• Write Latch Control: Includes a WLAT pin to inhibit volatile wiper register updates until a specific condition is met.
• Extended Temperature Range: Designed for industrial applications with an operating temperature range of -40°C to +125°C.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated or high-side signal conditioning.
• Test and measurement equipment needing programmable gain or attenuation in high-voltage environments.
• Automotive electronics utilizing dual-rail power supplies for sensor interfacing.

Digital Potentiometers Procurement Notes

Verify the ordering suffix '/ST' corresponds to the TSSOP-14 package when sourcing components. Confirm that the '502' designation matches the required 5 kΩ resistance value for the specific circuit design. Ensure the application utilizes volatile memory characteristics, as data is lost upon power removal.

Digital Potentiometers Selection Notes

Select this component over non-HV variants when analog terminal voltages exceed standard logic levels. The 7-bit resolution (128 taps) offers lower granularity compared to 8-bit versions; verify if finer adjustment is needed. Ensure the digital supply VL meets the minimum requirement relative to the analog negative rail V- (VL ≥ V- + 0.9V) for proper level shifting.

Digital Potentiometers Part Context

This part belongs to the MCP41HVX1 family, which also includes the 8-bit MCP41HV51 and I2C-interface variants like the MCP45HV31. The 'T' in the model number indicates tape-and-reel packaging, while 'ST' specifies the TSSOP-14 footprint. It serves as the high-voltage counterpart to standard low-voltage digital potentiometers.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include the MCP41HV51T-502E/ST (8-bit resolution) or the MCP45HV31T-502E/ST (I2C interface). Cross-family replacements require verifying SPI compatibility and ensuring the replacement supports the required +36V analog terminal voltage range.