MAX9938FEUK+T

Instrumentation, Op Amps, Buffer Amps Overview

The MAX9938FEUK+T is a unidirectional high-side current-sense amplifier manufactured by Analog Devices Inc./Maxim Integrated. It features a fixed gain of 50 V/V and operates with an input common-mode voltage range from 1.6V to 28V. The device provides a voltage output proportional to the sense voltage across an external resistor. It is housed in a 5-pin SOT-23 package and is specified for operation over an extended temperature range of -40°C to +85°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Ultra-low quiescent supply current of 1µA (max) for battery-operated applications
• Precision accuracy with low input offset voltage less than 500µV (max)
• Low gain error of less than 0.5% (max) for accurate measurements
• Wide input common-mode voltage range from 1.6V to 28V

Instrumentation, Op Amps, Buffer Amps Applications

• Cell Phones
• PDAs
• Power Management Systems
• Portable/Battery-Powered Systems
• Notebook Computers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific ordering suffix '+T' indicates tape-and-reel packaging when sourcing components. Confirm that the 'FEUK' designation corresponds to the 50 V/V gain option and the SOT-23 package type. Ensure compliance with RoHS standards as indicated by the '+' suffix. Cross-reference the manufacturer part number with official Analog Devices documentation to validate authenticity and revision status before procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a fixed 50 V/V gain is required for high-side current sensing. It is suitable for systems requiring a wide common-mode input range up to 28V. Consider the SOT-23 package for space-constrained designs where UCSP or μDFN options are not feasible. Ensure the application benefits from the ultra-low supply current characteristic for extended battery life in portable devices.

Instrumentation, Op Amps, Buffer Amps Part Context

The MAX9938 series includes four gain versions: 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The FE variant specifically denotes the 50 V/V gain configuration. Other package options include 4-bump UCSP and 6-pin μDFN. The series is designed for precision current monitoring in portable electronics, offering flexibility in choosing external sense resistors due to its low offset voltage and gain error specifications.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Other gain variants within the MAX9938 family, such as MAX9938TEUK+T (25 V/V), MAX9938HEUK+T (100 V/V), and MAX9938WEUK+T (200 V/V), share the same package and electrical characteristics except for gain. Package alternatives include MAX9938FELT+T (μDFN) and MAX9938FEBS+T (UCSP). Verify gain requirements and package compatibility when substituting.