MAX5407EKA+T

Overview

The MAX5407EKA+T is a single-channel digital potentiometer featuring 32 tap positions with logarithmic taper and 1dB step increments. It operates on a single supply voltage ranging from +2.7V to +5.5V, drawing a standby current of 0.35µA. The device maintains a fixed end-to-end resistance of 20kΩ with a temperature coefficient of 35ppm/°C. It utilizes a simple two-wire serial interface for control and includes zero-crossing detection to minimize audible noise during wiper transitions. The component is housed in an 8-pin SOT-23 package and functions reliably within a temperature range of -40°C to +85°C.

Feature Summary

• Logarithmic taper with 32 taps providing 1dB resolution steps
• Zero-crossing detection enabled via ZCEN pin to reduce audio clicks
• Low power consumption with 0.35µA standby current
• Power-on reset initializes wiper to maximum attenuation position

Applications

• Audio volume control circuits
• Signal fading and balancing applications
• Replacement for mechanical potentiometers in compact designs

Procurement Notes

Verify the specific ordering suffix EKA corresponds to the -40°C to +85°C temperature range and 8-pin SOT23 package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration into production assemblies.

Selection Notes

Select this component for applications requiring precise logarithmic attenuation rather than linear adjustment. Ensure the system logic levels are compatible with the specified input voltage thresholds. Verify that the 20kΩ end-to-end resistance aligns with the impedance requirements of the connected signal path.

Part Context

This part belongs to the MAX5407 series of SOT-PoT™ digital potentiometers. It serves as a solid-state alternative to traditional mechanical components, offering improved reliability and smaller footprint. The device integrates CMOS switches and a resistor string controlled by a digital up/down counter.

Replacement Considerations

Direct replacements include other Maxim Integrated digital potentiometers such as the MAX5408 or MAX5409, provided they match the required resistance value and package type. Cross-model substitution requires verification of interface compatibility and electrical specifications.