Fundamentals of Avalanche Sinterglass Diodes www.vishay.com Vishay Semiconductors Fundamentals of Avalanche Sinterglass Diodes Avalanche Sinterglass diodes are primarily used for conducting in one direction and blocking in the other. diodes for the deflection circuits in CRTs (e.g. BY228), freewheeling diodes for inductive loads etc. Within avalanche Sinterglass diodes there are several groups depending on the reverse recovery characteristic (reverse recovery time trr): The fig. 1. shows the basic rectifier characteristics with the two regions, the forward conducting region, in which the forward current IF is flowing and the reverse blocking region, in which the reverse leakage current IR is flowing. • Standard avalanche Sinterglass diodes with trr > 500 ns (e.g. BYT51, BYW56, BYW86) • Fast avalanche Sinterglass diodes with 100 ns < trr < 500 ns (e.g. BYT52, BYW36, BYW76) Current l Forward Surge Current Region • Ultra-fast avalanche Sinterglass diodes with trr < 100 ns (e.g. BYV26, BYV27, BYV28, SF5408) Avalanche Sinterglass diodes are of p-n junction technology with different processes to optimize the characteristics for different applications. They are placed in different packages, leaded like the avalanche Sinterglass (SOD-57, SOD-64) which fulfill different power requirements. Because of their predominant rectifying qualities, avalanche Sinterglass diodes are primarily used for power or signal conditioning in a variety of applications. This can range from high power output diode applications (e.g. power plants, railways,...) to low power switching diode requirements (e.g. mobile phone chargers, energy saving lamps,...). They are also used in several other specialized ways like clamping networks for SMPs (e.g. BYT52), damper and modulator VF at lF Typically 100 V to 2500 V Forward Conducting Region Voltage V 1V IR at VR Reverse Blocking Region 16495 Avalanche Breakdown Region Fig. 1 - Basic Rectifier Characteristics Rev. 1.9, 17-Feb-16 Document Number: 86100 1 For technical questions within your region: [email protected], [email protected], [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000