No where do I find what the thermal pad is connect to. Ground? Floating? or what? I assume ground but that doesn't seem to be a necessarily safe choice if it happens to be connected to V.
On page 3 its says "The exposed pad is electrically not connected" So connect it to anything you want. Your ground plane is usually the best bet.
Dave.
There must be some JEDEC standard that requires the electrical characteristics of power pads to be undefined.
Some float, some are V-, some are ground, some are even documented.
Call ST, or ohm it out in all directions to everything.
John
Page 3, "Note: the exposed pad is electrically not connected."
--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
or just look harder on page 3!
Dave.
damn, right under my nose... must be going blind. I searched the pdf for pad and it only returned the one on the IC ;/
thx
It's there... I'm just going crazy... (broke my glasses and it's been 3 weeks and still haven't revieced my new pair so I do have a good excuse ;)
Umm, page 3?
This is a trick question , right?
Cheers
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
"Jon Slaughter Stand Up Comic "
** Wrong terminology !!!The term " thermal pad " has a well understood meaning in electronics.
Google the term.
What that IC has is a ** heatsink pad** .
.... Phil
messagenews: snipped-for-privacy@r15g2000prd.googlegroups.com...
These things can be notoriously hard to find. I've found it's most commonly asterisked in the package data at the end of the datasheet, but have found it scattered all over the place, or in some cases not at all.
Dave.
We usually call them "power pads", which is actually the TI trademark.
LTC calls them "thermal pad."
ADI uses "exposed paddle" and "exposed pad."
John
Not much consistency, except that I didn't find "heatsink pad" once in my brief search.
ST: "Thermal Pad" (page 1) and "exposed pad" (page 3)
National: "Exposed Pad" and "EP"
Linear Technology: "Exposed Pad"
Analog Devices: "Exposed Pad".
TI: "Exposed Thermal Pad" (and "Exposed Metalized Feature" for the doohickeys on the sides of the "Exposed Thermal Pad").
TI (Burr Brown): "Exposed Thermal Pad"
Silicon Laboratories: "ePad" for device and "thermal pad land" for PCB.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
OK, sometimes they just hide it in the fine print.
John
It was definitely not anywhere in one part I used a few years ago. Even in the fine print. After playing phone tage for days I got the answer.
Some datasheets just say to nail it to "the ground plane" without actually saying if it's connected internally.
We always ohm them out just to be sure, or at least a little more sure.
I Dremel sectioned one TI part that is spec'd as having an isolated paddle. The chip is clearly soldered to the paddle. Maybe it's a DI thing.
John
or
choice
Or the die is backed with some form of oxide.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
or
choice
Elaborating, die back-side treatment as opposed to DI, which is done as channel/etch/oxide-fill from the die topside.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
Ambiguity = FUN !!!!
How else could you have jokes?
John
Here's one that depends on misdirection and surprise rather than ambiguity. As a consequence, it should be translatable to other languages and cultures (stolen from another newsgroup)
-- A woman was standing nude, looking in the bedroom mirror. She was not happy with what she saw and said to her husband, "I feel horrible; I look old, fat and ugly. I really need you to pay me a compliment." The husband replies, "Your eyesight's damned near perfect."
-- Best regards, Spehro Pefhany
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