Diodes BYY58A User Manual
Diodes Hardware

BYY57A / BYY58A 
50A Silicon Power Rectifier Diode 
Part no.
Description
The BYY57A/58A are hermetically sealed 50A- 
diodes, which are available in different reverse 
voltage classes up to 800V. 
The diodes can be delivered with limited forward 
voltage and reverse current differences for 
parallel connecting in rectifier stacks and back-
off-diodes 
Features
•
Forward current 50A
•
Reverse voltage 75V – 800V
•
Hermetic press-fit package
•
Available in different modifications of the 
package 
Applications
•
Power supplies
•
Rectifier diode in car generators
•
Rectifier bridges/stacks
•
Back-off-diodes
Pinout details
BYY57A: 1 – cathode; 2 - anode
BYY58A: 1 – anode; 2 - cathode
Typical application circuit
Six pulse 
bridge 
connection
~ ~ ~
3 x BYY57A-700
3 x BYY58A-700
+
-
1
2
Ordering information
Device
Quantity per box
Options
BYY57A-75; …; BYY57A-800
500
BYY58A-75; …; BYY58A-800
500
The package quantities for the different package 
modifications are included in 
“PressFitPackageModifications.pdf” 
Device marking
Devices are identified by type. Colour of marking: BYY57A- black, BYY58A – red
422........................................……. date code 422 = 2004 week 22
 ZETEX 
 BYY57...……………………………... diode type 
 A400 ……………………………….. 50A diode / repetitive peak reverse voltage V
RRM
(in V) 400
Issue 2 – November 2006
1
www.zetex.com
© Zetex Semiconductors plc 2006
