MCP45HV31T-103E/MQ

Digital Potentiometers Overview

The MCP45HV31T-103E/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 terminal voltages ranging from -36V to +36V relative to DGND. The device offers a nominal resistance of 10 kΩ (suffix 103) with 128 taps. Key specifications include a typical wiper resistance of 75 Ω, a bandwidth of approximately 240 kHz at the -3 dB point, and support for SCL frequencies up to 3.4 MHz. It operates on a dual power supply: 1.8V to 5.5V for digital logic and 10V to 36V for the analog network.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles terminal voltage ranges of ±18V or up to +36V relative to DGND.
• I2C Serial Interface: Supports standard modes including 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz.
• Write Latch Control: Includes a WLAT pin to inhibit volatile wiper register updates until a specific condition is met.
• Terminal Disconnect: Allows resistor network disconnection via the SHDN pin or TCON register.

Digital Potentiometers Applications

• High-voltage signal attenuation and gain control in industrial instrumentation.
• Programmable biasing for operational amplifiers and sensors requiring isolated analog rails.
• Calibration circuits in systems utilizing split power supplies (e.g., ±18V).

Digital Potentiometers Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging and 'MQ' indicates the VQFN-20 (5x5 mm) package. Confirm the '103' designation matches the required 10 kΩ resistance value. Ensure the application design accommodates the separate digital (VL) and analog (V+/V-) power domains as specified in the datasheet electrical characteristics.

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 steps, suitable for applications not requiring fine 8-bit adjustment. Verify that the system's analog supply can reach the minimum 10V threshold for specified performance. Consider the MCP45HV51 if 8-bit (256 tap) resolution is necessary instead.

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 'HV' designation specifically denotes the high-voltage analog capability compared to standard low-voltage digital potentiometers. The 'T' suffix indicates reel packaging, while 'MQ' specifies the 20-pin VQFN package type.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include the MCP45HV51T-103E/MQ (8-bit resolution) or the MCP45HV31T-104E/MQ (100 kΩ resistance). Cross-family replacements like the MCP4019 series lack the high-voltage analog support and must be evaluated carefully against the system's voltage requirements.