BY448 / BY458 is a standard Avalanche Sinterglass diode with glass passivated junction and hermetically sealed package. The component is lead (Pb)-free and compliant with RoHS 2002/95/EC and WEEE 2002/96/EC standards. It is suitable for high voltage rectification diodes and efficiency diodes in horizontal deflection circuits.
The BY448 and BY458 are standard avalanche (sinter‑glass) diodes offered by Vishay Semiconductors. They feature a hermetically sealed SOD‑57 glass package, lead‑free construction, and compliance with RoHS and WEEE directives. The devices are intended for high‑voltage rectification and efficiency diodes in horizontal deflection circuits.
Electrical specifications include a reverse voltage rating of 1500 V (BY448) or 1200 V (BY458), a continuous forward current of 2 A, a typical forward voltage of 1.6 V at 3 A, and a junction temperature limit of 140 °C. Thermal resistance is about 45 K/W for a 1 mm lead length, and the diodes can handle a 30 A forward surge current for 10 ms half‑sine pulses. This manual is written in Chinese.
| Reverse voltage (BY448) | 1500 V |
|---|---|
| Reverse voltage (BY458) | 1200 V |
| Forward current (IFAV) | 2 A |
| Junction temperature limit (Tj) | 140 °C |
| Package type | SOD‑57 glass‑sealed |
| Weight | ≈ 369 mg |
| Thermal resistance (RthJA) | 45 K/W (1 mm lead) |
The BY448 diode is rated for a maximum reverse voltage of 1500 V.
The BY458 diode can carry an average forward current of 2 A.
Both diodes are supplied in a glass‑sealed SOD‑57 package.
Yes, the devices are lead‑free and meet RoHS 2002/95/EC requirements.