Requesting Thermal Data for LM2940S-5.0/NOPB - LDO Voltage Regulator

Prathik Devalla

Other Parts Discussed in Thread: LM2940-N

Hi,

We require the Junction- Board and Junction- Case Thermal Resistance, Max Junction Temperature and Max Case Temperature. Some of the data is not available in the data sheet.

P.S- The part number-LM2940S-5.0/NOPB is not being recognized. I understand the it's an older part which was manufactured by National Semiconductors. Any assistance would be highly appreciated.

Thanks!

over 2 years ago

0 Nick Butts over 2 years ago

TI__Mastermind 41315 points

Hi Prathik,

I'm not sure I understand your question. I am seeing the Junction-Board and Junction-Case Thermal Resistance for all packages in the datasheet, as well as the max junction temperature. Max case temperature is not something that we normally specify, but you could calculate the max case temperature using the Junction-to-top characterization parameter.

Regards,

Nick

0 Prathik Devalla over 2 years ago in reply to Nick Butts

Prodigy 80 points

Hi Nick,

Thanks for reaching out. In this link https://www.ti.com/store/ti/en/p/product/?p=LM2940S-5.0/NOPB , the datasheet attached is for LM2940-N. Is LM2940N the same as LM2940S-5.0/NOPB? The package type is TO-263-3 .

Best,
Prathik

0 Nick Butts over 2 years ago in reply to Prathik Devalla

TI__Mastermind 41315 points

Hi Prathik,

LM2940S-5.0/NOPB is in the LM2940-N family. Hence you can use the following thermal metrics for it.

You can see which orderable part numbers are part of which family by looking at the product pages for both the LM2940C and LM2940-N in the "Ordering & quality" section.

Regards,

Nick

Power management

Power management forum

Requesting Thermal Data for LM2940S-5.0/NOPB - LDO Voltage Regulator