onsemi

MC34166T

MC34166T Description

The MC34166T from onsemi is a versatile, adjustable DC switching voltage regulator designed for high-efficiency power conversion in demanding applications. This obsolete but robust IC supports both buck and boost topologies, making it suitable for a wide input voltage range of 7.5V to 40V and delivering an output current of up to 3.3A (switch). With an adjustable output voltage ranging from 5.05V to 40V, it offers flexibility for diverse power supply designs. The device operates at a fixed switching frequency of 72kHz, ensuring stable performance with minimal external components. Packaged in a TO-220-5 through-hole format, it is ideal for prototyping and industrial applications requiring reliable power management.

MC34166T Features

• Wide Input Range (7.5V–40V): Accommodates varying input sources, including automotive and industrial power systems.
• Adjustable Output (5.05V–40V): Supports both step-down (buck) and step-up (boost) configurations for versatile design needs.
• High Output Current (3.3A): Delivers robust power handling for medium-load applications.
• 72kHz Switching Frequency: Balances efficiency and noise performance, reducing the need for large filtering components.
• Non-Synchronous Rectification: Simplifies design while maintaining efficiency in moderate-load scenarios.
• TO-220-5 Package: Easy to mount and suitable for through-hole PCB designs.
• REACH Unaffected: Compliant with environmental regulations, ensuring broader usability.

MC34166T Applications

The MC34166T excels in applications requiring adjustable, efficient power conversion, such as:

• Industrial Power Supplies: For machinery, PLCs, and control systems needing stable voltage regulation.
• Automotive Electronics: Suitable for infotainment, sensors, and auxiliary power systems with wide input ranges.
• Telecom Equipment: Provides reliable voltage conversion in base stations and networking hardware.
• LED Drivers: Supports constant-voltage or constant-current designs for lighting systems.
• Battery-Powered Systems: Ideal for portable devices requiring step-up or step-down regulation.

Conclusion of MC34166T

Though obsolete, the MC34166T remains a dependable choice for engineers seeking a flexible, high-current switching regulator with buck/boost capabilities. Its wide input range, adjustable output, and robust TO-220 package make it suitable for industrial, automotive, and telecom applications. While newer alternatives may offer higher efficiency or advanced features, the MC34166T stands out for its simplicity, reliability, and proven performance in medium-power designs.