DTO25 Datasheet, PDF (4/6 Pages) Vishay Siliconix – Surface Mounted Power Resistor Thick Film Technology

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DTO25
Vishay Sfernice
Single Pulse:
These informations are for a single pulse on a cold resistor at 25 °C (not already used for a dissipation) and for pulses of
100 ms maximum duration.
The formula used to calculate E is:
E = P x t = -^U-_R----²- x t
with:
E (J): Pulse energy
P (W): Pulse power
t (s): Pulse duration
U (V): Pulse voltage
R (Ω): Resistor
The energy calculated must be less than that allowed by the graph.
Repetitive or Superimposed Pulses:
The following formula is used to calculate the “equivalent“ energy of a repetitive pulse or the “equivalent energy“ of a pulse on
a resistor that is already dissipating power.
E_c
=
E
x


1
+
-^PP----^ar-_
with:
E_c (J): Equivalent pulse energy
E (J): Known pulse energy
P_r: Resistor power rating
P_a: Mean power being dissipated
The energy calculated must be less than that allowed by the graph and the average power dissipated (P_a) must not exceed the
continuous power of resistor.
PACKAGING
• Tube: max. 50 units per tube
• Reel: max. 500 units per reel
5.2
1.6
0.8
3
8.7
0.5
1
0.9
14.5
17°
R 0.5
0.8
MARKING
Model, style, resistance value (in Ω), tolerance (in %), manufacturing date, Vishay Sfernice trademark.
Revision: 23-Sep-15
4
Document Number: 51054
For technical questions, contact: [e-mail]
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