MCP4431-503E/ST

Digital Potentiometers Overview

The MCP4431-503E/ST is a quad digital potentiometer IC featuring four independent resistor networks with an I2C serial interface. It provides 7-bit resolution, offering 128 resistors and 129 taps per channel. The nominal resistance (RAB) is 50 kΩ, with a typical wiper resistance of 75 Ω. Operating voltage ranges from 1.8V to 5.5V for device operation, while analog characteristics are specified from 2.7V to 5.5V. The memory type is volatile RAM, resetting to mid-scale upon power-up. It supports standard (100 kHz), fast (400 kHz), and high-speed (up to 3.4 MHz) I2C modes.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent potentiometers with 7-bit resolution (129 taps).
• I2C Interface: Supports 100 kHz, 400 kHz, and up to 3.4 MHz clock speeds.
• High Voltage Tolerance: Digital inputs tolerate voltages up to 12.5V.
• Terminal Control: Includes a Terminal Control (TCON) register for resistor network disconnect.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits.
• Programmable gain amplifiers and variable attenuators.
• Voltage reference trimming and calibration systems.
• Sensor biasing and signal conditioning adjustments.

Digital Potentiometers Procurement Notes

Verify the package designation 'ST' corresponds to the TSSOP-20 form factor as indicated in the datasheet documentation. Confirm that the system design accommodates volatile memory behavior, as wiper settings are lost upon power loss and default to mid-scale. Ensure I2C bus timing requirements are met for the selected clock speed.

Digital Potentiometers Selection Notes

Select this component when four independent digital potentiometers are required with a 50 kΩ resistance value. The 7-bit resolution provides 128 steps, suitable for applications not requiring fine 8-bit or 10-bit granularity. Choose this over non-volatile variants if power consumption during standby is critical, as volatile RAM typically offers lower inactive current compared to EEPROM-based counterparts.

Digital Potentiometers Part Context

This part belongs to the MCP443X/5X family of quad digital potentiometers. The '3' in the model number indicates 7-bit resolution and volatile memory. The '503' suffix specifies the 50 kΩ resistance value. The 'E' denotes RoHS compliance, and 'ST' identifies the TSSOP-20 package.

Digital Potentiometers Replacement Considerations

For direct functional replacement with identical specifications, consider the MCP4431-103E/ST (10 kΩ) or MCP4431-104E/ST (100 kΩ) if resistance values differ. For higher resolution, the MCP4451-503E/ST offers 8-bit resolution with the same package and interface.

Digital Potentiometers FAQ

What is the default wiper position after power-up?

The wipers reset to the mid-scale position upon power-on reset (POR) or brown-out reset (BOR).

Can the digital inputs handle voltages higher than VDD?

Yes, the HVC/A0, A1, SCL, SDA, and RESET pins are high-voltage tolerant up to 12.5V.

Does the MCP4431 retain its setting when power is removed?

No, it uses volatile RAM. Wiper settings are lost when power is removed.