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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. 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. The backside case temperature of the device-under-test is sensed with a built-in thermocouple. This thermocouple is available in either of two designs:
embedded flush in the plate surface OR spring loaded with the Tc Sensor. Each design offers slightly different characteristics. Analysis Tech engineers can provide assistance in making this selection.
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. The positioning jig is also provided for easy and consistent placement of devices with respect to the case thermocouple.
Note: The plated copper cooling stage is typically connected to ground through the coolant water conduction, 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-Flush (for flush mounted Tc) OR Rjc-Liquid-Sensor (for Tc Sensor Probe)
Standard delivery 3 weeks. Ex Works (EXW) |
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