LP3965EMP-ADJ - theta Jc or Psi Jt

Ryuji

Guru 20090 points

Hello,

Could you please let me know the theta Jc or Psi Jt of LP3965EMP-ADJ (SOT-223)?

Best Regards,

Ryuji

over 11 years ago

0 Donald Jones over 11 years ago

TI__Mastermind 22610 points

Device = LP3965EMP

Pkg = SOT-223 / NDC / 5-pins

- - - - - - - -

Theta JA-High K = 65.4°C/W

Theta JC, top = 67.7°C/W

Theta JC, bottom = n/a

Theta JB = 10.1°C/W

Psi JT = 3.5°C/W

Psi JB = 9.9°C/W

0 Ryuji over 11 years ago in reply to Donald Jones

Guru 20090 points

Hello Donald san,

Thank you for the reply.

Could you please share the Theta JL (Junction to Lead) data of LP3965EMP with us if you have?

I think that the data is close to 0°C/W.

Best Regards,

Ryuji Asaka

0 Donald Jones over 11 years ago in reply to Ryuji

TI__Mastermind 22610 points

I am unable to share the LP3965EMP Theta(J-L) information as it is not available at this time.

This will require an additional request for thermal analysis for a non-standard datasheet value be submitted to the packaging group.

I presume that, in this case, the 'Lead' of interest for the 5-pin SOT-223 would be Pin 5 (aka GND TAB).

I will get the new request submitted momentarily.

0 Donald Jones over 11 years ago in reply to Ryuji

TI__Mastermind 22610 points

Just to confirm that the request has been submitted and I did request an expidited answer. However, there are a number of requests in the que ahead of me.

I do expect this may take a bit more than seven days.

0 Ryuji over 11 years ago in reply to Donald Jones

Guru 20090 points

Hello Donald san,

Thank you very much for your support.

Can I request the test condition ?

If you can , could you please get the data at the below conditions ?

Copper Area : 1.00 sq. in.

Air Flow : 3.2m/s

Sorry for my separate request.

Best Regards,
Ryuji Asaka

0 Donald Jones over 11 years ago in reply to Ryuji

TI__Mastermind 22610 points

This new request, with air flow rate and copper area, would only be appropriate for ThetaJA (junction-to-ambient), not for the requested ThetaJP (junction-to-pin).

ThetaJP (junction-to-pin) is similar to ThetaJC (junction-to-case) in that it is independent of externals such as PCB and air flow.

Please clarify which thermal parameter(s) you are seeking information for. I will either edit the existing request, or submit a new request. In some cases I may need additional information (i.e. board size, # of layers, copper weight per layer, copper area under the device tab, % copper coverage per layer, etc)

These resources may be helpful ...

WebTHERM Online Thermal Simulation (WEBENCH Design Center)
http://www.ti.com/lsds/ti/analog/webench/thermal-simulation.page

PCB Thermal Calculator (WEBENCH Design Center)
http://www.ti.com/adc/docs/midlevel.tsp?contentId=76735

0 Ryuji over 11 years ago in reply to Donald Jones

Guru 20090 points

Hello Donald san,

I apologize for a confusion.I need ThetaJP data. Please ignore the airflow and boards information of my previous post.

Best Regards,

Ryuji Asaka

0 Donald Jones over 11 years ago in reply to Ryuji

TI__Mastermind 22610 points

For LP3965EMP SOT-223-5 Theta(junction-to-pin), where 'pin' is the GND Tab ...

Theta (Junction-to-Tab) = 9.6°C/W

0 Ryuji over 11 years ago in reply to Donald Jones

Guru 20090 points

Hello Donald san,

Thak you for the data. I understood.

Best Regards,

Ryuji Asaka

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LP3965EMP-ADJ - theta Jc or Psi Jt