Fundamentals of Avalanche Sinterglass Diodes

Fundamentals of Avalanche Sinterglass Diodes
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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
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