ID of Old Transistor

--
Auction 'em off on ebay and get some empirical evidence...

Bendix made power transistors in the far past. Put it on a checker (or curve tracer) and see if it works.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Would you trust a transistor made between Xmas and New Years?

Looking in my 1968 Newark catalog, Bendix transistors are either standard 2N numbers, or B-170000 series. Most of the 2N stuff looks to be Germanium.

Mark Zenier snipped-for-privacy@eskimo.com Washington State resident

heat

transistor.

It passed the Diode Checker B-E & B-C. I haven't gotten to the Hfe tester yet but I will.

It's definitely Si. .602 & .598 V drops.

Norm

I'd guess it's a 2N6752B power trannie, but like I said, it's a guess.

Ken

(2"x3.5"x.75") heat

transistor.

tester

Well, NTE's sub for it, NTE2319, is given an Hfe of 5 and two totally different DMM's measure Hfe as 3, though at a vastly lower current than the NTE spec an unspecified, but presumably much higher current than my DMMs use. Semi-Tech gives an Hfe of 8 at 5.0 A about 3 orders of magnitude higher than the meters. My Motorola power transistor book from '78 shows curves for Hfe where the values at ~.01A are half of the peak. Again, this correlates with the measurements and specs.

The real test, I guess, would be to check (at least grossly) Vceo which, for the 2N6752, is shown as 850V. Since I have no real use for this type transistor and a replacement is currently selling for around $1.50 to $2.50, I think I'll stop here and assume that's what it is. I don't think it would pay to try to sell it on eBay.

Thanks.

Norm

It's definitely not a 2N6752B, because when Bendix got out of that business, the 2N numbers weren't even up to that high a number. That's the date code, most likely. Bendix made silicon power transistors, and I have a Bendix catalog at home. But that number doesn't ring a bell, so it's most likely a house number. And that long ago, the betas of silicon power transistors was not very high, maybe less than 40. So it's not a very good candidate for use in a modern design.

I would agree with you if the transistors were made by humans, but since it's more than likely that a human had little to do with the automated processes, then I don't see why that particular datecode would be worse.

Yeah, I think the Bendix catalog that I've got shows things similarly. Also, some of the silicon stuff comes in odd packages like the package for the 2N1016B, I forget the TO-xxx number of it.