MC33166TH

Voltage Regulators - DC DC Switching Regulators Overview

The MC33166TH is a discontinued step-down (buck) switching regulator from onsemi, housed in a TO-220-5 through-hole package. It operates with an input voltage range of 7.5V to 40V and delivers a switch current of 3.3A at a fixed frequency of 72kHz. The device features a fixed output configuration with a nominal reference voltage of 5.05V. Designed for industrial applications, it supports an operating temperature range of -40°C to 85°C and includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator programmed internally to 72kHz with on-chip timing components for stable operation.
• Provides high output switch current capability exceeding 3.0A to meet demanding power requirements.
• Incorporates precision internal reference voltage with ±2% accuracy, eliminating the need for external resistor dividers.
• Features complete protection suite including cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive power supply systems
• Industrial DC-DC converter designs
• Computer peripheral power regulation
• Cost-sensitive consumer electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component status carefully as this part number is officially obsolete and no longer manufactured by onsemi. Sourcing should focus on verified parameter-equivalent replacements or surplus stock from authorized distributors. Confirm RoHS compliance status, as historical data indicates non-compliance for certain variants. Ensure replacement selections match the original electrical specifications and thermal requirements before integration into new designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component only for legacy system maintenance or repair where exact pin-out and electrical characteristics are critical. For new designs, prioritize available active alternatives within the MC33166 family that offer updated compliance standards. Evaluate thermal management needs due to the TO-220 package constraints. Verify that the fixed 5.05V reference aligns with downstream load requirements without additional adjustment circuitry.

Voltage Regulators - DC DC Switching Regulators Part Context

The MC33166 series represents a line of high-performance fixed-frequency power switching regulators optimized for DC-DC converter applications. These devices integrate essential functions to minimize external component count, supporting buck, boost, and inverting topologies. The TH variant specifically denotes the through-hole TO-220-5 packaging suitable for higher power dissipation scenarios compared to surface-mount options.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

MC33166TVG is documented as a parameter-equivalent substitute for the discontinued MC33166TH. Both parts share similar electrical characteristics and package types, facilitating direct replacement in existing circuits while ensuring availability from current manufacturing lines.