Please help identifying those components - Page 1
Forum section: electronics / beginners

author: radu42
author_rank: Newbie
timestamp: February 24, 2024, 10:58:33 am
content: It says 98R on the transistors, but I didn't find it and I don't know what this code represents. Maybe you can help me.

author: tooki
author_rank: Super Contributor
timestamp: February 24, 2024, 11:12:12 am
content: The logo is from Siemens & Halske, the predecessor to today's Siemens. And in that package, it's almost certainly an RF transistor.A quick search for "siemens 98R RF transistor" turns up the Siemens BFT 98 transistor. Looking at the modern datasheet, it comes in case variants with and without a mounting stud. But the datasheet doesn't indicate "98R" marking, so either it's a different part after all, or they changed the markings at some point. The old databook page (available athttps://www.web-bcs.com/transistor/tc/bf/BFT98.phpin German and p. 766 ofhttps://ia801909.us.archive.org/28/items/httpsarchive.orgdetailselectroarch2/S/SiemensTransistorsDataBook1980-81_text.pdfin English) doesn't mention the studless option, so it's also conceivable that these were originally custom made for a customer.P.S. Please use the forum's own image hosting, so that images (and thus context) won't go missing if/when the external image goes away.

author: MarkT
author_rank: Frequent Contributor
timestamp: February 24, 2024, 06:31:23 pm
content: RF transistors not in anti-static packaging is a worry. Some types of RF transistor are extremely static sensitive and need full precautions in handling and packaging. Some have beryllia insulation which can generate highly poisonous dust if damaged.

author: p.larner
author_rank: Frequent Contributor
timestamp: February 24, 2024, 06:37:00 pm
content: why waste the server bandwidth telling us all what sould common knowledge to most folks on here?.

author: tooki
author_rank: Super Contributor
timestamp: February 24, 2024, 06:42:26 pm
content: Quote from: p.larner on February 24, 2024, 06:37:00 pmThis is the beginner’s subforum. You cannot expect “common knowledge” here, especially not specialty knowledge like the use of toxic beryllia. Not to mention that when it comes to safety, “better safe than sorry”: it’s better to tell someone something they already know than to leave them exposed to a hazard they weren’t aware of (but you were).

author: radu42
author_rank: Newbie
timestamp: February 25, 2024, 08:36:45 pm
content: I haven't received them yet. I saw that something else is written on the box and I hope to clarify myself fully. I didn't want the seller to "freak out" and increase the price, so I didn't ask for additional information.

author: Jwillis
author_rank: Super Contributor
timestamp: February 25, 2024, 09:49:07 pm
content: Quote from: tooki on February 24, 2024, 11:12:12 amThere are two types. The BFT98 with mounting stud and the BFT98B without mounting stud .https://archive.org/details/manuallib-id-2675396/mode/2up

author: tooki
author_rank: Super Contributor
timestamp: February 25, 2024, 10:02:05 pm
content: Quote from: Jwillis on February 25, 2024, 09:49:07 pmYeah, I know:Quote from: tooki on February 24, 2024, 11:12:12 amThe important bit came just after that:Quote from: tooki on February 24, 2024, 11:12:12 am(As evidenced by the logo used, the one you linked on archive.orgisthe modern datasheet.)

author: Jwillis
author_rank: Super Contributor
timestamp: February 25, 2024, 11:38:14 pm
content: Quote from: tooki on February 25, 2024, 10:02:05 pmI was not attempting to doubt your post nor make an attempt to make you look bad. I was simply adding some information that was lacking in the 2 websites you presented.https://www.web-bcs.com/transistor/tc/bf/BFT98.phpdoes not indicate it is a dual emitter. This can often confuse the novice when doing a search.The second sitehttps://ia801909.us.archive.org/28/items/httpsarchive.orgdetailselectroarch2/S/SiemensTransistorsDataBook1980-81_text.pdfdoes not indicate the difference between the two variants. This can also cause some confusion to a novice.I apologize for not being clear about my intentions.

author: tooki
author_rank: Super Contributor
timestamp: February 26, 2024, 07:24:23 pm
content: Quote from: Jwillis on February 25, 2024, 11:38:14 pmI'm still confused: what information did you add that wasn't already stated in my original reply?Why did you bring up dual emitter? Nobody said anything about that until now.