MCP45HV31T-503E/MQ

Digital Potentiometers Overview

The MCP45HV31T-503E/MQ is a single-channel, 7-bit volatile digital potentiometer from the MCP45HVX1 family. It features an I2C serial interface and supports high-voltage analog operation with a terminal voltage range of +36V relative to V-. The nominal resistance (RAB) is 50 kΩ with ±20% tolerance. Key electrical parameters include a typical wiper resistance (RW) of 75 Ω, a maximum wiper current of 6.5 mA, and a typical bandwidth of 48 kHz at -3 dB. The device operates on a dual power supply: analog rails (V+/V-) ranging from 10V to 36V and a digital supply (VL) from 1.8V to 5.5V.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage with ±18V differential capability.
• 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.
• Extended Temperature Range: Rated for operation from -40°C to +125°C.

Digital Potentiometers Applications

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

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'MQ' corresponds to the VQFN-20 (5x5) package type as specified in the datasheet. Confirm that the 'T' indicates tape-and-reel packaging if required by the assembly process. Ensure the 'E' suffix denotes RoHS compliance and lead-free manufacturing status before finalizing procurement orders.

Digital Potentiometers Selection Notes

Select this component when a 7-bit resolution is sufficient for the application's precision requirements. The 50 kΩ resistance value is suitable for moderate current loads up to 6.5 mA. Consider the MCP45HV51 series if 8-bit (256 tap) resolution is necessary, or the MCP45HV31-502E variant if a 5 kΩ resistance network is preferred for lower impedance applications.

Digital Potentiometers Part Context

This part belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit vs. 8-bit), interfaces (I2C vs. SPI), and resistance values. The '31' designation specifically identifies it as a 7-bit device with an I2C interface. The '503' code within the model number specifies the 50 kΩ nominal resistance value.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same family include the MCP45HV51T-503E/MQ for increased 8-bit resolution. For lower resistance needs, the MCP45HV31T-502E/MQ offers a 5 kΩ option. Cross-family replacements like the MCP40HV series may require interface adaptation as they often utilize SPI instead of I2C.

Digital Potentiometers FAQ

What is the maximum wiper current for the 50 kΩ version?

The maximum continuous wiper current (IW) for the 50 kΩ device is 6.5 mA.

How does the Write Latch (WLAT) pin function?

The WLAT pin inhibits the volatile Wiper register from being updated with received data until the pin is driven Low, allowing for synchronized updates such as zero-crossing switching.

What is the typical bandwidth of this device?

The typical -3 dB bandwidth is 48 kHz for the 50 kΩ device when the wiper code is set to mid-scale (3Fh).