Browse Prior Art Database

Constant Temperature Chip Holder

IP.com Disclosure Number: IPCOM000074821D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Bove, R: AUTHOR

Abstract

Under production testing conditions, it is imperative to test electrical devices at a constant temperature. Due to increasing power requirements of the devices and high-speed testing (high-duty cycle), it becomes a problem to remove the heat build-up in the device (chip) holders.

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Constant Temperature Chip Holder

Under production testing conditions, it is imperative to test electrical devices at a constant temperature. Due to increasing power requirements of the devices and high-speed testing (high-duty cycle), it becomes a problem to remove the heat build-up in the device (chip) holders.

The constant temperature chip holder 1 maintains a uniform temperature, and hence device temperature by utilizing the latent heat of vaporization of low- boiling point fluids, to transfer the heat dissipated by the device to the surrounding environment. The holder 1 has a hollow area where a refrigerant 5
(i.e. FREON* ) is placed, to partially fill the enclosure. Proper design of the holder tube, heat sink 3 and amount of refrigerant 5 will insure that under the worst heat generating conditions some liquid always remains, thus guaranteeing a constant temperature.

The holder 1 picks up a device 4 by vacuum 9 and aligns over a test position. The device 4 makes contact with electrical probes 2 and the device is energized with the test current 8. The heat 10 generated by the device 4 is transmitted to the holder 1 (by conduction), which in turn raises the temperature of the liquid to its boiling point. Further, heating causes the liquid to vaporize, maintaining a constant liquid temperature. (This temperature is dependent on the refrigerant used below). The vapors 6 rise in the tube and transfer the heat to the colder surfaces at the top of the tube, by conde...