LM2674N-3.3

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 applications. It operates with an input voltage range of 8 V to 40 V and delivers a maximum output current of 500 mA at a fixed 3.3 V level. The device features a high switching frequency of 275 kHz, enabling the use of compact external components. It is housed in an 8-pin MDIP package with dimensions of 9.27 mm length, 6.35 mm width, and 3.3 mm height. The unit supports an operating temperature range from -40 °C to +125 °C and achieves an efficiency of approximately 86%.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a monolithic switching regulator capable of stepping down input voltages up to 40 V to a stable 3.3 V output.
• Supports through-hole mounting via an 8-pin MDIP package suitable for prototyping and legacy board designs.
• Operates at a fixed 275 kHz switching frequency to minimize passive component size requirements.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems requiring 3.3 V logic levels
• Power supply stages for microcontroller units and digital signal processors
• Battery-powered equipment utilizing higher voltage sources

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific ordering suffix matches the required tolerance and packaging configuration. Confirm the presence of the NOPB designation indicates lead-free status and compliance with RoHS directives. Ensure the MDIP package variant aligns with the intended through-hole assembly process and thermal management requirements for the target application environment.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required from an input rail between 8 V and 40 V. The 500 mA current limit defines the maximum load capacity. Consider the 275 kHz frequency for trade-offs between component size and electromagnetic interference. The through-hole package dictates the physical layout constraints compared to surface-mount alternatives within the same family.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2674 series of simple switcher regulators. It provides a fixed voltage solution distinct from adjustable variants like the LM2674-ADJ. The series shares core topology but differs in output configuration and package options. This specific model represents the standard through-hole version for reliable 3.3 V generation.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other LM2674N-3.3/NOPB units from authorized distributors. Cross-referencing requires matching the 500 mA current rating, 40 V max input, and 3.3 V fixed output. Package compatibility must be verified if replacing with surface-mount equivalents such as the LM2674M series.