APPROVALS 
l UL recognised, File No. E91231 
'X' SPECIFICATION APPROVALS 
l VDE 0884 in 3 available lead form : - 
- STD 
- G form 
- SMD approved to CECC 00802 
l BSI approved - Certificate No. 8001 
DESCRIPTION 
The TLP521, TLP521-2, TLP521-4 series of 
optically coupled isolators consist of infrared 
light emitting diodes and NPN silicon photo 
transistors in space efficient dual in line plastic 
packages. 
FEATURES 
l Options :- 
10mm lead spread - add G after part no. 
Surface mount - add SM after part no. 
Tape&reel - add SMT&R after part no. 
l High Current Transfer Ratio ( 50% min) 
l High Isolation Voltage (5.3kVRMS ,7.5kVPK ) 
l High BVCEO ( 55Vmin ) 
l All electrical parameters 100% tested 
l Custom electrical selections available 
APPLICATIONS 
l Computer terminals 
l Industrial systems controllers 
l Measuring instruments 
l Signal transmission between systems of 
different potentials and impedances 
 
 
 
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