HD3SS3220: Maximum junction temperature

Fred Cheng

Part Number: HD3SS3220

Hi team,

I know how to calculate Tj with Ta,

I just curious if there's a absolute junction temperature "limit", normally should be 150C for other IC, but it's not listed in datasheet

over 3 years ago

0 Brian Zhou over 3 years ago

TI__Guru*** 146785 points

Let me check with design if they know..

Regards

brian

0 Brian Zhou over 3 years ago in reply to Brian Zhou

TI__Guru*** 146785 points

absolute max junction temp is 125C

0 Fred Cheng over 3 years ago in reply to Brian Zhou

TI__Expert 5790 points

Hi Brian,

How about recommended operating junction temperature? it's also not in the datasheet?

0 Brian Zhou over 3 years ago in reply to Fred Cheng

TI__Guru*** 146785 points

It's based on each system, PCB related, you need to calculated.

Regards

Brian

0 Fred Cheng over 3 years ago in reply to Brian Zhou

TI__Expert 5790 points

Hi Brian,

I believe that's the definition of junction temperature,

but I was referring to recommended junction temperature, which will damage IC if the temperature is over that limit.

Normally, that value is a spec listed by designer. so would you help get this information for customer , thanks

0 JMMN over 3 years ago in reply to Fred Cheng

TI__Guru 60870 points

Hello,

We are checking with design.

Regards,

JMMN

0 Fred Cheng over 3 years ago in reply to JMMN

TI__Expert 5790 points

Hi ,

Any update about recommended junction temperature?

below is other IC's datasheet for your reference

0 Brian Zhou over 3 years ago in reply to Fred Cheng

TI__Guru*** 146785 points

Actual power dissipation inside the device is much higher. Yes, it burns only 0.9mA for operation, but most power dissipation is in VCONN power switch. For the VCONN switch max Ron is 1.25ohm, max current is 375mA, resulting 0.47W max power dissipation inside the device. Most use cases will not use VCONN power though, but option is required.

With 0.47W max power we are looking at 113C junction - within our design limit of 125C.

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HD3SS3220: Maximum junction temperature