MCP4452T-103E/ST

Digital Potentiometers Overview

The MCP4452T-103E/ST is a quad rheostat digital potentiometer IC manufactured by Microchip Technology. It features four independent resistor networks with 8-bit resolution, providing 256 taps (257 steps). The nominal resistance between terminals A and B is 10 kΩ, with a tolerance of ±20%. The device operates on a supply voltage range of 2.7V to 5.5V for specified characteristics, extending down to 1.8V for operation. It utilizes an I²C serial interface supporting standard (100 kHz), fast (400 kHz), and high-speed modes up to 3.4 MHz. Memory type is volatile RAM, and the wiper resets to mid-scale upon power-on reset.

Digital Potentiometers Feature Summary

• Quad Rheostat Configuration: Four independent variable resistors with 8-bit resolution (256 taps) and 10 kΩ nominal resistance.
• I²C Serial Interface: Supports 100 kHz, 400 kHz, and high-speed modes up to 3.4 MHz with high-voltage tolerant inputs up to 12.5V.
• Wide Operating Voltage: Specified performance from 2.7V to 5.5V; operational down to 1.8V.
• Low Power Consumption: Typical inactive current of 2.5 µA and low wiper resistance of 75 Ω typical.

Digital Potentiometers Applications

• Programmable gain amplifiers and signal conditioning circuits
• Voltage reference trimming and calibration
• Audio volume control and equalization
• Adjustable timing circuits and oscillators

Digital Potentiometers Procurement Notes

Verify the package designation 'ST' corresponds to TSSOP-14 as per the datasheet. Confirm the suffix 'T' indicates tape and reel packaging. Ensure the operating environment stays within the -40°C to +125°C temperature range. Check that the system voltage does not exceed the absolute maximum ratings for digital inputs (12.5V) or VDD (7.0V).

Digital Potentiometers Selection Notes

Select this component when a quad rheostat configuration is required instead of a potentiometer. The 8-bit resolution provides 256 discrete steps suitable for precise analog adjustments. Verify that volatile memory behavior aligns with the application's need to reset to mid-scale upon power-up. Ensure the I²C bus speed requirements are met by the controller.

Digital Potentiometers Part Context

This part belongs to the MCP443X/5X family of 7/8-bit volatile quad digital potentiometers. The '5' in the model number indicates 8-bit resolution (257 taps), distinguishing it from the '3' series which offers 7-bit resolution. The '2' suffix denotes the rheostat configuration, while '1' would indicate a potentiometer. It shares the same pinout and interface as other variants in the MCP44xx series.

Digital Potentiometers Replacement Considerations

Direct replacements include other MCP4452 variants with different resistance values (e.g., MCP4452-503E/ST for 50 kΩ) or packages. For 7-bit resolution, the MCP4432 series is compatible but offers fewer taps. Non-volatile alternatives like the MCP4462 series provide similar functionality with EEPROM storage.