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The Analysis Tech Rjc (Theta JC) Liquid Cooled Thermal Test Fixture is a high performance liquid-cooled heat sink with convenient electrical connections to the device-under-test. This fixture is ideally suited for measuring the JEDEC-defined parameter 'Rjc' for all device types including IGBT modules and large MOSFET packages. Temperature controlled coolant water must be supplied to the fixture from a recirculating chiller (available accessory). Drip-free quick-connect hose fittings are provided for convenient connection of the coolant hoses.
A top-mounted combination plug/screw connector provides high-current heating-power connections to the device-under-test. The side-mounted edge-card connector provides duplicate low-current terminals, convenient for part-specific wiring and kelvin connections. This design allows the fixture to be quickly reconfigured for any part-type by swapping the part-specific, two-connector wiring harness. A type-T thermocouple is embedded flush in the surface of the copper cooling plate to measure the backside case temperature of the device-under-test.
The device-under-test is clamped to the heat sink surface with a special pneumatic clamp, shown above. The pneumatic clamp offers a regulated and measured clamping force that will not change with temperature induced dimensional changes of the sample. The air cylinder used is a special air-balance cylinder with fluidic bearing that provides very accurate force measurement and control. For larger packages, convenient tapped holes (10-32 size) are provided to accommodate many common device/module footprints.
Note: The plated copper cooling stage is connected to ground through the coolant water, therefore devices with an electrically "live" connection to package (and thus the cooling stage) require the use of distilled water or non-aqueous, dielectric coolants. Contact Analysis Tech for additional information.
| Sink Thermal Resistance (RHS) |
Coolant Flow Rate (Liter/min. - H2O) |
| 0.016 °C/W |
6.0 LPM |
| 0.014 °C/W |
8.0 LPM |
| 0.012 °C/W |
10.0 LPM |
| 0.011 °C/W |
12.0 LPM |
| (Maximum Pressure Required: 400 kPa (60 psi) |
Mechanical Specifications
| Dimensions |
9" H x 7.5" W x 11.5" D |
| Weight |
7 lbs |
Ordering Information
Part Number: Rjc-Liquid
Standard delivery 3 weeks. Ex Works (EXW) |
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