MAX5474EKA

Overview

The MAX5474EKA is a single-channel, nonvolatile linear-taper digital potentiometer housed in an 8-pin SOT-23 package. It provides 32 wiper positions with a nominal end-to-end resistance of 50kΩ and operates on a single supply voltage ranging from +2.7V to +5.25V. The device utilizes a simple 3-wire up/down digital interface (CS, U/D, INC) to adjust the wiper position. Key electrical characteristics include a maximum static supply current of 1µA, a 35ppm/°C end-to-end resistance temperature coefficient, and a 5ppm/°C ratiometric temperature coefficient. It is rated for operation over an extended temperature range of -40°C to +85°C.

Feature Summary

• Nonvolatile EEPROM memory stores the wiper position, which is automatically recalled upon power-up.
• Simple 3-wire serial interface (CS, U/D, INC) controls the wiper among 32 tap positions.
• Low static supply current of 1µA maximum in standby mode.
• Linear taper configuration with 50kΩ end-to-end resistance in a compact SOT-23-8 package.

Applications

• Mechanical potentiometer replacement
• Liquid-Crystal-Display (LCD) screen adjustment
• Audio volume control
• Programmable filters

Procurement Notes

Verify the component marking 'AEIZ' to confirm the specific part number MAX5474EKA. Ensure the operating environment remains within the specified -40°C to +85°C temperature range. Confirm that the digital input voltages are driven close to VDD or GND to maintain low static supply current, as intermediate logic levels increase power consumption.

Selection Notes

Select the MAX5474EKA when a 3-terminal voltage-divider or variable-resistor configuration is required with a 50kΩ resistance value. Choose this model over the MAX5471 if external access to the high (H), low (L), and wiper (W) terminals is necessary. Verify that the application requires nonvolatile storage to retain settings after power cycles.

Part Context

The MAX5474EKA belongs to the MAX547x family of 32-tap nonvolatile digital potentiometers manufactured by Analog Devices / Maxim Integrated. This family includes the MAX5471, MAX5472, and MAX5475 variants, which differ primarily in pin count and resistance values. The MAX5474 specifically offers the 3-terminal configuration with 50kΩ resistance in an 8-pin SOT-23 package.

Replacement Considerations

The MAX5475EKA is a functional substitute with identical pinout and interface but features a 100kΩ end-to-end resistance instead of 50kΩ. The MAX5471EKA is not a direct pin-compatible replacement due to its 6-pin SOT-23 packaging and internal connection of the wiper to the high terminal.