MAX5403EUB+

Updated: 2026-09-12

Overview

The MAX5403EUB+ is a digital potentiometer manufactured by Maxim Integrated (now part of Analog Devices). It is designed to replace mechanical potentiometers in electronic circuits, offering programmable resistance via a digital interface. The device is widely used in industrial control systems, audio equipment, and calibration applications due to its reliability and precision. With a 10kΩ resistance range and 256 tap points, the MAX5403EUB+ provides fine-grained adjustment capabilities. Its compact μMAX package makes it suitable for space-constrained designs, while its low power consumption (typically 3μA) ensures energy efficiency in battery-operated devices.

Structure and Working Principle

The MAX5403EUB+ consists of a resistor ladder network with MOSFET switches controlled by an internal digital-to-analog converter (DAC). The resistance between the wiper terminal and either end terminal is adjusted via an SPI-compatible serial interface, allowing microcontroller-based control. The device operates with a supply voltage range of 2.7V to 5.5V, making it compatible with both 3.3V and 5V systems. Non-volatile memory is not included, so the wiper position must be reprogrammed after power cycles unless external storage is implemented in the system design.

Key Features

Key features of the MAX5403EUB+ include its 1% end-to-end resistance tolerance, which ensures consistent performance across production lots. The device offers a -40°C to +85°C operating temperature range, suitable for most industrial environments. Additional notable features include its low temperature coefficient (35ppm/°C typical) and low wiper resistance (100Ω typical). The 3-wire SPI interface supports clock rates up to 20MHz, enabling rapid adjustments in dynamic applications.

Application Areas

The MAX5403EUB+ finds applications in various electronic systems requiring programmable resistance. Common uses include LCD contrast control, sensor calibration circuits, and programmable gain amplifiers in test equipment. In industrial settings, it's used for process control calibration and equipment trimming. Consumer applications include volume control in audio systems and brightness adjustment in display panels. The device's small footprint makes it particularly valuable in portable electronics where board space is limited.

Maintenance and Precautions

The MAX5403EUB+ requires minimal maintenance as it has no moving parts. However, proper handling is essential as the device is sensitive to electrostatic discharge (ESD). Always use proper ESD precautions during installation and handling. When designing with this component, ensure the maximum voltage across any terminal does not exceed the absolute maximum rating of VDD + 0.3V. The device should be stored in its original packaging until use, with recommended storage conditions of -65°C to +150°C in a dry environment.

B2B Procurement Guide

When procuring the MAX5403EUB+ in bulk, verify the manufacturer's current lead times as supply chain conditions may vary. Many authorized distributors offer volume pricing discounts, with price breaks typically starting at quantities of 100 units. For production applications, consider ordering samples first to verify compatibility with your design. Check for alternative part numbers (such as the MAX5403EUB+T for tape-and-reel packaging) that might better suit your manufacturing process. Always purchase from authorized distributors to avoid counterfeit components.