BY458TR

Overview

The BY458TR is a standard avalanche sinterglass diode manufactured by Vishay Semiconductors in the SOD-57 package. It features a maximum repetitive reverse voltage of 1200 V and an average forward current rating of 2 A. The device exhibits a maximum forward voltage of 1.6 V at 3 A and a typical reverse recovery time of 2 μs under specified test conditions. Thermal resistance values are 45 K/W with leads extended 10 mm and 100 K/W on a printed circuit board.

Feature Summary

• Glass passivated junction for enhanced reliability
• Hermetically sealed package construction
• Avalanche rated capability

Applications

• High voltage rectification
• Horizontal deflection circuits

Procurement Notes

Verify the specific ordering code against the required packaging format, as the BY458 is available in tape and reel or ammopack configurations. Confirm that the 1200 V reverse voltage rating aligns with the target circuit requirements. Ensure compliance with RoHS directives if applicable to the manufacturing process. Validate thermal management strategies based on the specified junction temperature limits.

Selection Notes

Select this component when a high-voltage standard recovery diode is required in a compact axial leaded form factor. The 1200 V rating distinguishes it from lower voltage variants within the same series. Consider the 2 A average current limit for continuous operation. Evaluate the thermal resistance characteristics relative to the intended mounting position and ambient temperature conditions.

Part Context

This part belongs to the BY448/BY458 family of standard avalanche sinterglass diodes. While sharing the SOD-57 package and general construction, the BY458 is differentiated by its 1200 V reverse voltage rating compared to the 1500 V rating of the BY448. Both devices share identical mechanical dimensions and thermal characteristics.

Replacement Considerations

Direct substitutes include the BY448, which offers a higher 1500 V rating but shares the same 2 A current capacity and SOD-57 package. Verify that the increased voltage rating does not conflict with specific design constraints before substitution.