MCP41HV51T-103E/MQ

Digital Potentiometers Overview

The MCP41HV51T-103E/MQ is a single-channel, 8-bit digital potentiometer from Microchip Technology, housed in a VQFN-20 (5x5 mm) package. It features dual power rails, supporting analog terminal voltages up to +36V relative to V-, or ±18V when DGND is offset by 18V. The device operates with a digital supply of 1.8V to 5.5V and an analog supply of 10V to 36V for specified performance. It provides 256 taps with a nominal resistance of 10 kΩ (±20% tolerance). Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of 240 kHz at -3 dB, and support for SPI serial interfaces at frequencies up to 10 MHz.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles terminal voltages up to +36V or ±18V relative to digital ground.
• Dual Power Rails: Independent analog (V+/V-) and digital (VL/DGND) supplies allow flexible system grounding.
• 8-Bit Resolution: Offers 256 discrete tap positions with volatile memory and a default power-on reset value of 7Fh.
• SPI Interface: Compatible with standard SPI modes (0,0 and 1,1) operating at clock frequencies up to 10 MHz.

Digital Potentiometers Applications

• High-voltage signal attenuation and gain control in industrial instrumentation.
• Programmable voltage references requiring isolated analog and digital grounds.
• Audio processing circuits where high common-mode voltage rejection is necessary.
• Calibration systems for sensors operating in extreme voltage environments.

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'MQ' corresponds to the VQFN-20 package variant during procurement. Confirm that the application design accounts for the dual-rail power requirements, specifically ensuring VL remains within 1.8V to 5.5V while V+ supports the required analog range. Check datasheet limits for thermal dissipation in the VQFN-20 package under maximum load conditions.

Digital Potentiometers Selection Notes

Select this component when applications require handling analog signals exceeding standard logic levels, up to 36V. Ensure the system can provide separate analog and digital power domains. For lower voltage applications, consider the standard MCP4151 series. Verify that the 10 kΩ resistance value aligns with the desired current consumption and power dissipation limits for the specific rheostat or potentiometer configuration.

Digital Potentiometers Part Context

This part belongs to the MCP41HVX1 family, which includes variants with different resolutions (7-bit/8-bit) and interface types (SPI/I2C). The 'HV' designation indicates high-voltage analog support. The '51' suffix denotes the 8-bit resolution version, while '103' specifies the 10 kΩ resistance value. The 'MQ' suffix identifies the VQFN-20 package type.

Digital Potentiometers Replacement Considerations

Direct replacements within the same family include MCP41HV31T-103E/MQ (7-bit resolution) or MCP41HV51T-103E/ST (same specs but TSSOP-14 package). Cross-family replacements like MCP4151T-103E/SN lack high-voltage analog support and are not suitable for +36V applications.