MCP45HV51-103E/ST

Digital Potentiometers Overview

The MCP45HV51-103E/ST is an 8-bit digital potentiometer IC from Microchip Technology, housed in a 14-pin TSSOP package. It features a single resistor network with a nominal resistance of 10 kΩ and 256 taps. The device supports high-voltage analog operation with a terminal voltage range up to +36V relative to V-, or ±18V when referenced to digital ground. It utilizes an I²C serial interface for control and retains volatile wiper settings. Key electrical parameters include a typical wiper resistance of 75 Ω, a supply current of 45 µA (inactive), and an operating temperature range of -40°C to +125°C.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Operates with terminal voltages up to +36V (DGND = V-) or ±18V (DGND = V- + 18V).
• Dual Power Rails: Separate analog supply (V+/V-) and digital supply (VL/DGND) allow flexible system integration.
• I²C Serial Interface: Supports standard modes including 100 kHz, 400 kHz, 1.7 MHz, and 3.4 MHz.
• Write Latch (WLAT): Pin-controlled update mechanism allows synchronization of wiper changes to specific conditions like zero crossing.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated high-voltage adjustment.
• Automotive electronics utilizing dual-rail power supplies.
• Programmable gain amplifiers and variable attenuators in test equipment.
• Power supply voltage reference trimming.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'ST' corresponds to the TSSOP-14 package configuration. Confirm the resistance code '103' indicates a 10 kΩ nominal value. Ensure the environment meets the extended temperature rating requirements (-40°C to +125°C) if operating outside standard commercial ranges.

Digital Potentiometers Selection Notes

Select this model for applications requiring 8-bit resolution (256 taps) and high-voltage analog terminals. The 10 kΩ resistance option balances current handling capabilities (12.5 mA max) with power dissipation. Consider the TSSOP-14 package constraints regarding thermal dissipation and pin pitch compared to the VQFN alternative.

Digital Potentiometers Part Context

This component belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit vs. 8-bit) and interfaces (SPI vs. I²C). The '51' designation specifically denotes the 8-bit I²C version. The '103' suffix identifies the 10 kΩ resistance value within the available options of 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include MCP45HV51T-103E/MQ (VQFN package) or MCP45HV51-103E/MQ. For SPI interface compatibility, consider the MCP41HV51 series, though pinouts and control registers differ significantly.