onsemi

MC33166T

MC33166T Description

The MC33166T from onsemi is an adjustable switching voltage regulator IC designed for high-efficiency DC-DC conversion. This obsolete but robust component supports both buck and boost topologies, making it versatile for various power supply designs. With an input voltage range of 7.5V to 40V, it delivers an adjustable output voltage from 5.05V up to 40V (switch-dependent), capable of handling 3.3A switch current. Operating at a fixed switching frequency of 72kHz, it balances performance and efficiency while minimizing external component count. Packaged in a TO-220-5 through-hole format, it is suited for industrial and automotive applications requiring reliable power management.

MC33166T Features

• Dual Topology Support: Functions as a buck or boost converter, offering design flexibility.
• Wide Input Range: 7.5V–40V input accommodates fluctuating power sources.
• High Current Handling: 3.3A switch current for demanding loads.
• Adjustable Output: 5.05V to 40V output range (switch-dependent) for precision voltage regulation.
• Fixed Frequency Operation: 72kHz switching reduces noise and simplifies filtering.
• Non-Synchronous Rectification: Cost-effective for applications not requiring ultra-high efficiency.
• Robust Packaging: TO-220-5 through-hole mounting ensures mechanical durability and heat dissipation.

MC33166T Applications

• Automotive Systems: Ideal for 12V/24V battery-powered systems, such as infotainment or lighting.
• Industrial Power Supplies: Suitable for factory automation equipment requiring stable voltage conversion.
• Telecom Infrastructure: Used in base stations for efficient power delivery.
• LED Drivers: Supports boost configurations for driving high-voltage LED arrays.
• Obsolete Equipment Maintenance: A reliable choice for servicing legacy systems.

Conclusion of MC33166T

The MC33166T is a versatile, high-performance switching regulator with buck/boost capability, making it ideal for applications demanding wide input ranges and adjustable outputs. While marked obsolete, its 3.3A current handling, 72kHz operation, and rugged TO-220-5 package ensure reliability in harsh environments. Engineers working on automotive, industrial, or telecom projects will find it a practical solution for efficient power conversion, though modern alternatives should be considered for new designs.