SC4437SK-3.3TRT

Overview

The SC4437SK-3.3TRT is a precision shunt voltage reference manufactured by Semtech Corporation, housed in a compact SOT-23 package. It provides a fixed output voltage of 3.3V with an initial accuracy of 1%. The device operates within a supply voltage range of 2.5V to 20V and maintains stable regulation across a temperature range of -40°C to +85°C. Designed for low-power applications, it features a typical operating current of 80µA and supports a maximum cathode current of 100mA. This component serves as a reliable reference source for analog-to-digital converters, microcontrollers, and portable instrumentation systems requiring high stability and minimal power consumption.

Feature Summary

• Provides a fixed 3.3V precision reference output with tight initial tolerance
• Operates over a wide input voltage range from 2.5V to 20V
• Ensures thermal stability across extended industrial temperature ranges
• Optimized for low quiescent current consumption in battery-powered devices

Applications

• Portable handheld instruments and measurement devices
• Microcontroller and digital signal processor reference supplies
• Battery-operated consumer electronics and IoT sensors
• Data acquisition systems requiring stable voltage benchmarks

Procurement Notes

Verify the specific suffix 'SK-3.3' confirms the fixed 3.3V output variant, as other suffixes may indicate adjustable versions or different accuracies. Confirm RoHS compliance status for your region's regulatory requirements. Check for end-of-life notifications or obsolescence warnings directly from Semtech, as this part number may have limited availability compared to newer generations. Ensure the SOT-23-3 package footprint matches your PCB design constraints.

Selection Notes

Select this component when a fixed 3.3V reference is required instead of an adjustable one, simplifying external resistor networks. Compare against the SC4431 series if higher accuracy or different packaging is needed. Consider the 100mA load capability against your circuit's peak current demands. Evaluate the 80µA standby current against strict battery life requirements for wearable or remote sensing applications.

Part Context

This device belongs to Semtech's SC443x family of precision shunt regulators, designed to replace traditional Zener diodes in modern low-voltage circuits. The family includes both adjustable (e.g., SC4431) and fixed voltage variants. The SC4437 specifically offers fixed outputs, providing designers with a drop-in solution for standard logic levels without requiring external feedback resistors, thereby reducing board space and component count.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.