Need theta_JC for PBSS5540Z BJT

[cjcygan]

Hello,

I am evaluating the thermal performance of the PBSS5540Z BJT (bipolar junction transistor) and am measuring the case temperature using a Therma-Bridge (manufactured by IMS) to guarantee thermal conductivity between a J-type thermocouple and the PBSS5540Z collector case (the Therma-Bridge also guarantees electrical isolation).  I need to accurately calculate the junction temperature of this part.  Page 4 of 10 of the attached datasheet shows the junction to ambient thermal resistance (Rth_JA).  To calculate an accurate junction temperature, I need to know the junction to case thermal resistance (Rth_JC), since case temperature was measured and Rth_JA = Rth_JC + Rth_CA (thermal resistance from case ambient).

What is the thermal resistance from junction to case (Rth_JC) on this part? I have already contacted Nexperia 2 weeks ago and posted a similar technical support ticket on their website, but no one has responded yet and I need this information ASAP.

Thank you,

Carl Cygan

[TomasVaverka]

Hi Carl,

Thanks for your inquiry. This question is related to the Standard Products business. We would like to inform you that NXP has divested it´s Standard Products business on Feb 6th 2017. This new standalone company is called “Nexperia”, headquartered in the Netherlands, and is a world-class leader in Discretes, Logic and MOSFETs.

We would like to ask you to re-enter your inquiry at the Nexperia support web page: www.nexperia.com/support. Thank you!

Best regards,

Tomas