MCP4017T-503E/LT

Overview

The MCP4017T-503E/LT is a single-channel digital potentiometer manufactured by Microchip Technology. It features a 50 kΩ total resistance (R_AB) with 7-bit resolution, providing 128 discrete wiper steps. The device operates on a supply voltage range of 1.8V to 5.5V and utilizes an I²C serial interface for control. It employs volatile RAM memory, resetting the wiper to mid-scale upon power-up. Key electrical characteristics include a typical wiper resistance of 100 Ω, a bandwidth of 260 kHz at 50 kΩ, and low static current consumption of 2.5 µA. The component is housed in a compact SC70-6 package and supports operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• 7-bit resolution offering 128 distinct wiper positions within a single resistor network.
• I²C serial interface supporting standard mode (100 kHz) and fast mode (400 kHz).
• Configurable as either a rheostat or potentiometer via pin connections.
• Low power consumption with 2.5 µA typical static current and brown-out reset protection.

Applications

• Volume control and gain adjustment in audio signal processing circuits.
• Voltage reference trimming and calibration in measurement systems.
• Programmable biasing networks for analog sensors and transducers.
• Adjustable threshold settings in monitoring and protection circuits.

Procurement Notes

Verify the specific suffix 'LT' corresponds to the tape-and-reel packaging format when sourcing components. Confirm that the application design accommodates volatile memory behavior, as wiper settings are lost during power cycles. Ensure the I²C bus pull-up resistors are selected appropriately for the operating voltage range of 1.8V to 5.5V to maintain signal integrity.

Selection Notes

Select this model for applications requiring a single-channel variable resistance controlled via I²C. The 50 kΩ value suits moderate impedance networks; lower values like 5 kΩ offer higher bandwidth, while 100 kΩ provides higher impedance. Consider the SC70-6 package size constraints and verify that the 100 Ω typical wiper resistance meets the load requirements of the target circuit.

Part Context

This component belongs to the MCP4017/18/19 family of 7-bit digital potentiometers. The MCP4017 variant specifically supports rheostat configuration, whereas the MCP4018 supports potentiometer configuration, both sharing the same SC70-6 footprint and electrical specifications. The 'T' designation indicates reel packaging, distinguishing it from cut-tape variants.

Replacement Considerations

The MCP4018T-503E/LT offers identical electrical performance but is configured for potentiometer use rather than rheostat. For non-volatile memory retention, consider the MCP4022 series which utilizes EEPROM instead of RAM. SPI-based alternatives such as the MCP4132 provide similar resolution but require a different interface protocol.