TL974-Q1: Thermal information, Psi-JT and Theta-JC

takishin

Expert 2360 points

Part Number: TL974-Q1
Other Parts Discussed in Thread: TL972-Q1,

Our customer has a question about thermal information.
I'm posting the question for the customer.

TL972-Q1 and TL974-Q1.
In current datasheet, only Theta-JA has been shown for each package.

Could you let me know Psi-JT and Theta-JC both for the following devices?

TL972QDRQ1 (SOIC-8pin)
TL972QPWRQ1 (TSSOP-8pin)

TL974QPWRQ1 (TSSOP-14pin)

Thank you in advance.

Best regards,
Takishin

over 6 years ago

0 Bala Ravi over 6 years ago

TI__Expert 6625 points

Hi Takishin,
We have processed your thermal request. Please allow us up to 5 business days to get back to you with your thermal data.

Best Regards,
Bala Ravi

0 takishin over 6 years ago in reply to Bala Ravi

Expert 2360 points

Hello Bala,

Thank you for your prompt reply.

I look forward to hearing from you.

Best Regards,
Takishin

0 Bala Ravi over 6 years ago in reply to takishin

TI__Expert 6625 points

Hi Takishin,

Please find below the thermal data that you've requested. If this resolved your question, please click "This Resolved my Issue" button.

Thermal Metric	TL972Q		UNIT
	D(SOIC)	PW(TSSOP)
	8 PINS	8 PINS
RθJA Junction-to-ambient thermal resistance	134.3	187.9	°C/W
RθJC(top) Junction-to-case(top) thermal resistance	78	77.2	°C/W
RθJB Junction-to-board thermal resistance	77.6	118.9	°C/W
ψJT Junction-to-top characterization parameter	25.9	12.9	°C/W
ψJB Junction-to-board characterization parameter	76.9	117.1	°C/W
RθJC(bot) Junction-to-case(bottom) thermal resistance	N/A	N/A	°C/W

Thermal Metric	TL974QPWRQ1	UNIT
	PW(TSSOP)
	14 PINS
RθJA Junction-to-ambient thermal resistance	121.7	°C/W
RθJC(top) Junction-to-case(top) thermal resistance	50.8	°C/W
RθJB Junction-to-board thermal resistance	64.9	°C/W
ψJT Junction-to-top characterization parameter	6.4	°C/W
ψJB Junction-to-board characterization parameter	64.3	°C/W
RθJC(bot) Junction-to-case(bottom) thermal resistance	N/A	°C/W

Best Regards,

Bala Ravi

0 takishin over 6 years ago in reply to Bala Ravi

Expert 2360 points

Hello Bara,

Many thanks for taking the time to address my request.
I'll report this information to our customer.

By the way, RθJAs are different from the values in the datasheet.

I have one question.
Should I use the above-mentioned parameters, not the datasheet?

Best regards,
Takishin

0 Bala Ravi over 6 years ago in reply to takishin

TI__Expert 6625 points

Hello Takishin,
Use the above mentioned parameters for thermal data.

Best Regards,
Bala Ravi

0 takishin over 6 years ago in reply to Bala Ravi

Expert 2360 points

Hello Bala,

Thank you for your answer.
I understand.

Best regards,
Takishin

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TL974-Q1: Thermal information, Psi-JT and Theta-JC