Can I replace D882 transistors by MJE802?

Posted: 9/29/2021 2:14:08 AM
sleepycc

Joined: 8/25/2016

Hi all, I bought a D882 transistor after reading a detailed introduction article about this device, here's the link: D882 datasheet. It says that LM1558 is the alternative of LM1458. But it didn’t give me their comparison about specifications. I’m not the expert at transistors.
So I have a question: can these two be used interchangeably?

Posted: 10/1/2021 5:02:37 AM
Flounderguts

Joined: 10/24/2020

Ok, I think a lot of people aren't answering this because the question isn't clear. 

A D882 is a general purpose NPN transistor, and has lots of alternates that can be used instead. The best value is probably a BD882 from Onsemi, but parts marked sd882 will work as well, for a bit more money. An MJE802 is functionally the same, but they are obsolete and I haven't seen one for sale for a long time. Check the pinout when you swap out a new transistor, as the collectors and emitters are sometimes on the opposite sides!

Not sure why you brought up OpAmps...LM1558 and 1458 are similar in operation, but have completely different packages and limits. They are NOT interchangeable. A 1558 comes in a metal can (TO-99) and the 1458 comes in a PDIP or SOIC package. 

Are you using these in a theremin? A circuit diagram or explanation would help. 

Posted: 10/12/2021 4:42:58 PM
edavid

From: Montana, USA

Joined: 9/2/2019

Ok, I think a lot of people aren't answering this because the question isn't clear. A D882 is a general purpose NPN transistor, and has lots of alternates that can be used instead. The best value is probably a BD882 from Onsemi, but parts marked sd882 will work as well, for a bit more money. An MJE802 is functionally the same, but they are obsolete and I haven't seen one for sale for a long time.

2SD882 and MJE802 are both current production parts.

2SD822 is a slow medium power NPN, and MJE802 is a very slow medium power Darlington NPN, so they are definitely not interchangeable.

Posted: 10/12/2021 4:49:36 PM
edavid

From: Montana, USA

Joined: 9/2/2019

LM1558 and 1458 are similar in operation, but have completely different packages and limits. They are NOT interchangeable. A 1558 comes in a metal can (TO-99) and the 1458 comes in a PDIP or SOIC package.

That's not correct.  If you check the datasheet, it says:


The LM1458 is identical to the LM1558 except that the LM1458 has its specifications guaranteed over the
temperature range from 0°C to +70°C instead of −55°C to +125°C.


The package is specified by the part suffix, e.g. LM1458N is DIP.

These were originally Motorola parts (MC1458/MC1558), which is why the numbering system doesn't match other LM series parts.

These are old parts that you shouldn't use without a good reason.


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