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S/ACC/5TH2xxx/A/12/09/2005
THERMAL Pads
For SC, SV and SO relays Low thermal resistance Easy to use
5TH21000 / 5TH23000 and 1LWP2300
For an efficient cooling of power components, it is usual to apply a thermally conducting media, such as thermal grease, between the power element and the heatsink. Thermal grease is considered problematic due to difficulties in applying it to the heatdissipating surface and also performances in the life of the product. An alternative, celduc tested a range of products and compared their thermal resistance characteristics (Rth c/h : Thermal Resistance between case to heatsink) celduc recommends Aluminium materials thermal pads with very good thermal performances and no modification in the long term. (See comparison tests on last page):
5TH21000
And now in the same technology, celduc introduce an adhesive thermal PAD.
36.8mm
36.8mm
Glue on both edges
5TH23000
Page 1/5
celduc thermal pads performances :
5THxxxx thermal PAD is a thermally conductive phase change material coated on both sides of aluminium foil. At temperatures greater than 52C, 5THxxxx changes into a molten state and, under low closure force, wets the heat sink and component surfaces to create a very thin, low thermal resistance interface. 5THxxxx has great heat spreading characteristics and won't flow from the interface. 5THxxxx has superior thermal performance comparable to the highest performing grease and phase change products available.
Colour
With the 5TH23000 adhesive thermal PAD, as glue is only on the
edges, there is no incidence in terms of thermal performances.
On the last page you can see comparison tests between different technologies
Page 2/5
How to use 5TH21000 ?
How to use 5TH23000 (adhesive model).
36.8mm
We can deliver in Roll of 2500 pieces
36.8mm
Glue on both edges
Page 3/5
We can deliver the SSR with the 5TH23000 thermal PAD already mounted. For all SC, SV or SO range we can ask for the option "with thermal PAD 5TH23000 mounted on the SSR": 1LWP23000 When you order your SSR, add the option 1LWP23000 The SSR will be delivered with the thermal PAD.
New okpac(R) range
Without thermal PAD
With 5TH23000 adhesive thermal PAD
On aluminium base of the SSR
Page 4/5
Without Grease or pad
0.05K/W
0.045K/W
0. 04K/W
Problems in the long term
Usual products Page 5/5
celduc solution : high initial and in long term performances

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