Extra Spec Data on PL080-8.5-40-01LS Thermoelectric

Hello! I am looking for additional information on a product I am experimenting with. Specifically, it is on the Marlo thermoelectric device, Manufacturer Product Number PL080-8.5-40-01LS. The Digi-Key Part Number is 1681-1051-ND.

  1. First, what the specific materials of the p and n legs on the device?
  2. Another question is what is the fill factor of the legs.
  3. Additionally, what is the leg thickness?
  4. Lastly, is there is a way I can get a more detailed CAD model, beyond the one that is linked on the website?
    Thank you.

Hi hoyingmy. Welcome to the forum!

Unfortunately, we don’t have the specific data you are looking for. The datasheet we have access to isn’t calling out those specific parametrics. The CAD model we have listed is also the only one we have.

I’m going to ask our product manager who works with Marlow to see if we can get more detailed information for you, but it may take a few days to hear anything back. I’m sorry I don’t have a quicker answer for you.

Good Morning Jerry,

I wanted to follow up if you heard back from the product manager who works with Marlo about my questions on my order. The Marlo product is for research the University of Cincinnati is conducting, to put these questions in a new light. To reiterate, the questions I have are:

  1. What material is used in the p and n legs.
  2. Fill factor of the legs.
  3. Leg geometry including thickness
  4. New Question​​ What is the electrical resistance
  5. New Question​​ What is the thermal resistance

Lastly, the Manufacturer’s Product Number is PL080-8.5-40-01LS. The Digi-Key Part Number is 1681-1051-ND.

Thank you for your time,

Hello hoyingmy.

I still haven’t heard back from the product manager. It seems everyone in the industry is really busy at this time, and it’s causing some delays in response time across the board.

Thank you for your patience, and I’ll be sure to get back to you as soon as I hear anything.

Component manufacturers generally do not provide detailed information about their products’ internal construction, in the interest of intellectual property protection. Prevailing industry conditions aside, I would be surprised if a response were to be forthcoming.

That said, much of the information requested could be obtained to a reasonable degree of accuracy through destructive examination; I would suggest obtaining a similar item manufactured without edge sealant to facilitate this process, and a common set of calipers in proper working order. A hot plate capable of reaching up to around 200°C could be used to melt the solder used to assemble the device uniformly, or the device itself could be used to selectively melt the solder on one side.

The most common thermoelectric materials used for this temperature range are bismuth telluride based; the dopant species used and their respective concentrations are perhaps less predictable, though discernable through techniques such as x-ray crystallography. Should such resources not be available somewhere among the chemistry-heavy parts of the UC campus, it’s probable that one could at least find somebody with connections to such there.

As for electrical and thermal resistances, one needs to specify the conditions under which these values are to be measured; being a thermoelectric device, they will change to a notable extent depending on test conditions. While the small-signal AC resistance at 27°C is characterized on page 1 of the datasheet, this value is not guaranteed nor applicable at other device temperatures. Depending on your particular interests, this may be another point of information that you would want to measure yourself.

Hello,

Please see the additional questions from the MFG:

  1. First, what the specific materials of the p and n legs on the device? Bismuth Telluride
  2. Another question is what is the fill factor of the legs. Not sure what is asking, likely per STD AQL.
  3. Additionally, what is the leg thickness? A/L element = .194 cm
  4. Lastly, is there is a way I can get a more detailed CAD model, beyond the one that is linked on the website? No, the CAD model linked on the website is the only one available.

Please answer these questions and we can sent this back for them to review.

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Hello,
Thank you for the extensive response as I appreciate your time answering my questions. That being said, I do have two additional questions which are:

  1. Do you know the ZT value?
  2. Do you know the Seebeck coefficient, S (μV K-1)?

Thank you

Unfortunately I do not. There may be some typical/industry standard values floating around on the internet that might be close, but I can’t guarantee that they would apply to the device in question. The supply chain for devices of this type seems likely to be narrower than it might appear however, so a person could probably take those values as a suggestion, do some experimental sanity checks, and proceed as the data indicates.