Tuesday, 2 April 2013

Diode Data Sheet & its Electrical Characteristics


The data sheets for diodes Provides maximum ratings, electrical characteristics, mechanical data, graphs of parameters, etc. for electrical device which are currently in use.
We can see several parameters in a data sheet for diodes:

Maximum ratings of Diodes:

i) VRRM: (Peak repetitive reverse voltage).
–The Peak repetitive reverse voltage can be defined as the maximum reverse peak voltage that can be applied repetitively across the diode.

ii) VR: (DC blocking voltage)
DC blocking voltage can be defined as the maximum reverse dc voltage that can be applied across the diode.

iii) VRSM: (Nonrepetitive peak reverse voltage)
Non repetitive peak reverse voltage is the maximum reverse peak value of non repetitive voltage that can be applied across the diode.

iv) IO: (Average rectified forward current)
 IO is the maximum average value of a 60Hz rectified forward current.

v) IFSM: (Nonrepetitive peak surge current)
IFSM is the maximum peak value of non repetitive (of one cycle) forward surge current..

vi) TA:
– Ambient temperature can be denoted by TA.

vii) TJ:
– Operating junction temperature range can be defined by TJ.

viii) Tstg:
Tstg is the storage junction temperature range.

Electrical Characteristics of a diode :

vF: vF can be defined as the instantaneous voltage across the diode in forward-biased condition when forward current is 1 A at 25oC. That can be generally shown by the help of a graph.

VF(avg): VF(avg) is the maximum forward voltage drop averaged over a full cycle.

IR: IR is the maximum current occurred when the diode is in reverse-biased condition.

IR(avg): IR(avg) can be defined as the maximum reverse current averaged over one cycle (when reverse-biased with an ac voltage).

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