PTM 7900 | Phase Change Pad

Harmonization Code : 8473.30.80.00 | Parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 8470 to 8472 ; Parts and accessories of the machines of heading 8471 ; Other; Other

Main features

0.045 Thermal Impedance
8.0 Thermal Conductivity
Pad form

Product Description

PTM7900 is designed to minimize thermal resistance at interfaces and maintain extremely stable performance through reliability testing required for long product life applications. It has stable Thermal Impedance across accelerated aging tests and does not display bleed, pump or flow out. PTM7XXX product line has the highest Thermal conductivity and lowest thermal impedance out of the entire PTM Series

PTM7900 has a Thermal conductivity of 8.0 (W/m·K) depending on the bondline thickness and is based on a robust polymer PCM structure that exhibits excellent wetting properties during typical operating temperature ranges, resulting in very low surface contact resistance. This proprietary material provides superior reliability and maintains low thermal impedance (0.045) , making it desirable for high-performance integrated circuit devices. It has been qualified from major GPU and cooling solution manufacturers across the globe.

PTM7900 is almost as good as it gets. The only product that has slightly better thermal properties is PTM7950 which reaches 8.5 W/m·K and 0.04 TI and is designed for extremely demanding and tight applications.

Product Family
PTM7900

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27 x 44 x 0.2mm Pad 33 x 38 x 0.2mm Pad 100 x 100 x 0.2mm Pad 150 x 400 x 0.2mm Sheet 150 x 400 x 0.25 mm Sheet 150 x 400 x 0.3 mm Sheet 47.8 x 34.7 x 0.2mm Pad 49x 49 x 0.2mm Pad 55 x 72 x 0.2mm Pad

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Specifications
Additional Information

Technical Specifications

General Properties
Specific Gravity Specific Gravity Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.	2.8
Thickness range	0.20 - 1.00 mm
Electrical Properties
Volume Resistivity Volume Resistivity Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.	2.1x10¹⁴ Ohms⋅cm
Thermal Properties
Specific Heat Capacity Specific Heat Capacity Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to the size of the system being examined.	0.97 J/(g⋅°C)
Thermal Conductivity Thermal Conductivity Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.	8.0 W/m.K
Thermal Impedance	0.046 °C·cm²/W

Additional Information

What are the reliability expectations of the PTM 7XXX products?

All the 7XXXseries (7000, 7900 & 7950) pass the three major reliability tests with flying colours. Honeywell does not test beyond 1000 cycles, 92 hrs HAST and 1000 hrs HTS. However, anecdotally, some automotive customers have taken 7900 to beyond Honeywell’s limits and have found it to pass shock and vibration, longer temperature cycling and longer temperature and humidity soak.

If your lifetime performance is defined mainly by power cycling, then you also check the 6000 series which will have the longest life.

The main difference between the 7XXX products is the filler content which makes 7950 the most conductive.