I found very common two 13001 switching transistors with different pinout. One is MJE13001 and the other one is 13001S6B. the pinout of MJE13001 ( L to R) is B-C-E but the pinout of 13001S6B is E-C-B. is this common ?
part number is : 13001.., MJE or S6B are manufacture's code ...correct ?The last time I looked MJE13001 and 13001S6B were not the same part number.
I don.t think there a standard other than dimensions and structure for casings.Yes definitely possible. US & Japanese have different pinouts for TO-92.
As someone else stated; Japanese transistor pinouts usually differ from EU & US types - parts with the same number can sometimes differ from different manufacturers (mostly TO92 types).I found very common two 13001 switching transistors with different pinout. One is MJE13001 and the other one is 13001S6B. the pinout of MJE13001 ( L to R) is B-C-E but the pinout of 13001S6B is E-C-B. is this common ?
Its worth remembering that most transistors exhibit a reverse B/E zener effect very substantially lower than the collector breakdown voltage.The only cure is to go through the work of finding the exactly correct datasheet for every part before you design the circuit board. Sometimes a reversed emitter and collector will be a welcome simplification of the layout. Sometimes, you just get burnt fingers.
It may also be worth mentioning that some manufacturers offered a choice of pin layout for the basic part, perhaps the most common being the European EBC layout, and anything with an L suffix has the BCE layout of Asian transistors.Glad I read this thread.
Surely the reason is obvious?Still yet, I have to wonder why the industry standard components and cases (like an NPN TO-92) wouldn't have standard pinouts. Perhaps the ending of the last paragraph is exactly that reason.
The one I have is the Peak Atlas tester, anything that looks like 2 back to back diodes gets tested both ways round for gain to differentiate C/E.I can verify the device is 'good' and see the pinout in ~15 seconds with this tester.
http://www.banggood.com/DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-Resistor-NPN-PNP-p-929603.html
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I don.t think there a standard other than dimensions and structure for casings.
A BC series has E-B-C, a BF series has B-E-C; both BC and BF are European standards.
Purely guesswork on my part; the European and many US transistors EBC layout may have evolved from the original alloy-diffused transistors - a slice of germanium as the base in the middle with a bead of indium melted into each side to form the emitter and collector - the early Japanese 2SA and 2SB germanium transistors also had the familiar EBC layout.There is no a priori reason why that should be the case. Why would you think that?
I'm not sure I follow. I can't think of a TO-92 transistor I've ever used that didn't have the base on pin 2. Therefore, the only reversal could be the collector, and emitter. This same reversal could be made by simply turning the part's silkscreen around. I'm not seeing the obvious simplification.Surely the reason is obvious?
It allowed less complicated (more efficient) circuit track topology in the days before multiplane boards and routing programs.
Almost all Asian TO92 transistors have the base at one end an the collector in the middle.I'm not sure I follow. I can't think of a TO-92 transistor I've ever used that didn't have the base on pin 2. Therefore, the only reversal could be the collector, and emitter. This same reversal could be made by simply turning the part's silkscreen around. I'm not seeing the obvious simplification.