MCP45HV31-103E/ST

Digital Potentiometers Overview

The MCP45HV31-103E/ST is a single-channel, 7-bit volatile digital potentiometer manufactured by Microchip Technology. It features an I2C serial interface and operates with a wide analog voltage range of +10V to +36V (referenced to V-) or ±18V relative to DGND. The device provides 128 taps with a nominal resistance of 10 kΩ. Key electrical parameters include a typical wiper resistance of 75 Ω, a bandwidth of 480 kHz at -3 dB, and support for SCL frequencies up to 3.4 MHz. It includes hardware controls such as a Shutdown pin and Write Latch functionality.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Operates with terminal voltages up to +36V or ±18V relative to digital ground.
• I2C Serial Interface: Supports standard modes including 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz.
• Write Latch Control: Dedicated WLAT pin allows synchronization of volatile wiper register updates.
• Terminal Disconnect: Includes SHDN pin and TCON register for resistor network isolation.

Digital Potentiometers Applications

• Industrial control systems requiring high-voltage signal adjustment
• Power management circuits with dual-rail supply configurations
• Test and measurement equipment needing precise resistance tuning

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'ST' corresponds to the TSSOP-14 package when sourcing components. Confirm that the application design accommodates the volatile memory nature of the device, as wiper settings are lost upon power loss. Ensure the digital supply voltage (VL) meets the minimum requirement relative to the analog negative rail (V-) for proper operation.

Digital Potentiometers Selection Notes

Select this component for applications requiring a single potentiometer channel with high-voltage tolerance and I2C connectivity. The 7-bit resolution offers 128 taps, suitable for moderate precision requirements. Consider the 10 kΩ resistance value against the maximum wiper current limit of 12.5 mA. For non-volatile storage needs, alternative models within the family must be selected.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with SPI interfaces and different resolutions. The '31' designation indicates a 7-bit resolution with 128 taps, distinguishing it from the 8-bit MCP45HV51 series. The '103' suffix specifies the 10 kΩ nominal resistance value.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same package and interface include other MCP45HV31 variants with different resistance values (e.g., 5kΩ, 50kΩ). Cross-family substitution with MCP45HV51 requires accounting for the increased 8-bit resolution and potential software register adjustments.