LM2674N-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2674N-3.3/NOPB is a Texas Instruments fixed-output step-down switching regulator designed for through-hole mounting in an MDIP-8 package. It accepts an input voltage range of 8 V to 40 V and provides a fixed 3.3 V output with a maximum load current of 500 mA. The device operates at a switching frequency of up to 275 kHz, achieving typical efficiency ratings between 86% and 90%. It functions within an extended temperature range from -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic buck converter topology
• Fixed 3.3 V regulated output capability
• Supports wide input voltage ranges up to 40 V
• Operates at high switching frequencies for compact external component sizing

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Input voltage step-down for industrial control circuits
• Power supply conditioning for communication equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free compliance and RoHS adherence as per manufacturer specifications. Ensure the 'N' designation matches the required MDIP through-hole package variant rather than surface-mount alternatives. Cross-reference the full part number against official datasheets to confirm the fixed 3.3 V output version is selected, distinguishing it from adjustable or other voltage variants within the same family.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust through-hole solution is required for moderate current applications up to 500 mA. The fixed 3.3 V output eliminates the need for external feedback resistors, simplifying design. Consider the 40 V maximum input rating for direct battery or bus line connections. Evaluate thermal management requirements given the power dissipation characteristics inherent to linear-like dropouts in buck converters under heavy loads.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2674 series of simple switcher regulators from Texas Instruments. It serves as a legacy through-hole alternative to newer surface-mount devices like the LM22674. The series is characterized by its ease of use, requiring minimal external components to establish a stable regulated output, making it suitable for rapid prototyping and standard PCB layouts.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2674N-3.3/NOPB is functionally equivalent to the older LM2674N-3.3. Surface-mount equivalents include the LM2674MX-3.3/NOPB, though pinout compatibility requires verification. For higher current needs, consider the LM2675 series.