MCP4551-503E/MS

Digital Potentiometers Overview

The MCP4551-503E/MS is a single-channel, 8-bit digital potentiometer manufactured by Microchip Technology. It features a 50 kΩ nominal resistance (R_AB) with 256 taps and volatile memory storage for wiper settings. The device operates on an I²C serial interface supporting standard, fast, and high-speed modes. Key electrical parameters include a typical wiper resistance of 75 Ω, a supply voltage range of 1.8 V to 5.5 V, and an operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• 8-bit resolution providing 256 discrete tap positions
• I²C serial interface compatible with 100 kHz, 400 kHz, and 3.4 MHz speeds
• High-voltage tolerant digital inputs up to 12.5 V
• Volatile RAM-based wiper memory

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference adjustment
• Digital volume control in audio circuits

Digital Potentiometers Procurement Notes

Verify the specific suffix 'E/MS' corresponds to the MSOP-8 package and RoHS compliance when sourcing. Confirm that the '503' designation indicates the 50 kΩ resistance value required for the application. Ensure the system design accounts for the volatile nature of the memory, as wiper settings will reset upon power loss.

Digital Potentiometers Selection Notes

Select this component over the MCP4531 variant if 8-bit resolution (256 steps) is necessary rather than 7-bit. Choose this model instead of the MCP4541 or MCP4561 series if non-volatile EEPROM memory is not required. Verify that the 50 kΩ resistance value aligns with the circuit's impedance requirements compared to 5 kΩ, 10 kΩ, or 100 kΩ options.

Digital Potentiometers Part Context

This part belongs to the MCP45XX family of single-channel digital potentiometers. It shares the same pinout and core architecture as the MCP4531 but offers higher resolution. It is distinct from the MCP4552, which is configured as a rheostat rather than a potentiometer.

Digital Potentiometers Replacement Considerations

MCP4531-503E/MS: Compatible alternative with identical pinout but reduced to 7-bit resolution (129 steps).

Digital Potentiometers FAQ

What is the default wiper position after power-up?

The wiper initializes to the mid-scale position upon power-on reset.

Can the HVC/A0 pin tolerate voltages higher than VDD?

Yes, the HVC/A0 pin is high-voltage tolerant and can withstand up to 12.5 V even when VDD is lower.

Does the device retain its setting when power is removed?

No, the MCP4551 uses volatile RAM, so the wiper setting is lost when power is removed.