onsemi

MC34166TG

MC34166TG Description

The MC34166TG from onsemi is a versatile adjustable DC switching voltage regulator capable of operating in buck or boost topologies, making it suitable for a wide range of power conversion applications. Designed for through-hole mounting (TO-220-5 package), this regulator supports an input voltage range of 7.5V to 40V and delivers a switched output current of up to 3.3A. Its adjustable output voltage (5.05V to 40V) and 72kHz switching frequency ensure efficient power management with minimal external components. Although now obsolete, it remains a robust choice for legacy designs requiring positive or negative output configurations.

MC34166TG Features

• Wide Input Range (7.5V–40V): Supports diverse power sources, including automotive and industrial supplies.
• High Output Current (3.3A Switch): Suitable for medium-power applications.
• Buck/Boost Topology: Flexible for step-down or step-up voltage conversion.
• Adjustable Output (5.05V–40V): Precision control via external resistors.
• 72kHz Switching Frequency: Balances efficiency and noise performance.
• Non-Synchronous Rectification: Simplifies design with external diode selection.
• RoHS3 Compliant & REACH Unaffected: Meets environmental standards.
• Industrial Temperature Range (0°C to 70°C): Reliable operation in moderate environments.

MC34166TG Applications

The MC34166TG excels in systems requiring compact, efficient power conversion, such as:

• Automotive Electronics: Voltage regulation for infotainment or sensors.
• Industrial Power Supplies: Step-down/up converters for control systems.
• Telecom Equipment: Intermediate bus voltage regulation.
• Legacy Designs: Cost-effective upgrades for obsolete power modules.
  Its TO-220 package simplifies thermal management in high-current scenarios, while its non-synchronous design reduces complexity in noise-sensitive applications.

Conclusion of MC34166TG

While the MC34166TG is no longer in production, its robust design, wide voltage range, and dual-topology flexibility make it a compelling choice for engineers maintaining or upgrading older systems. Its 3.3A output capability and adjustable voltage ensure compatibility with diverse loads, though modern alternatives may offer higher efficiency or integration. For legacy projects requiring reliable, through-hole power regulation, this IC remains a viable solution.