boylesg
Advanced Member level 4
- Joined
- Jul 15, 2012
- Messages
- 1,023
- Helped
- 5
- Reputation
- 10
- Reaction score
- 6
- Trophy points
- 1,318
- Location
- Epping, Victoria, Australia
- Activity points
- 11,697
800mA/25mA = 32
Please don't tell you were unable to find any standard transistor with the Hfe higher than this value.Code:800mA/25mA = 32
- - - Updated - - -
At the following supplier, there are 661 device options in stock with the above requirements (Ic>900mA / Ib<25mA):
Product Index > Discrete Semiconductor Products > Transistors - Bipolar (BJT) - Single
Nor do I.I don't have formal training
...and because of this the given distributor chart selection is that useful. For all of us.So my knowledge of what transistor series are out there is extremely limited.
Hi,
Nor do I.
...and because of this the given distributor chart selection is that useful. For all of us.
It´s free and simple to use. Just input your data you posted. No engineer knowledge needed.
And lucky we live in year 2018..
Some 10 years back there was no internet..
Klaus
There does not seem to be any regular PNPs that matches my requirements. The minimum gain needs to be better than 80 at 1A or so.
Hi,
Is there a reason the circuit needs a PNP rather than a PMOS? I think it might be easier using a PMOS.
Time to try by your own how to do searches with web tools in the supplier's pages as the one recommended above. Appart from your manifested little familiarity with electronics, doing this query is something too trivial that even a layman can do it with no effort, and I doubt you even had the curiosity to click the link gave above; there you can find dozens of devices that meet your (new) requirements.
Assuming that those component search tools on mouser, RS electronics,........ cover the full range of transistors on the market at this time?
Epping, Victoria, Australia....fixed my profile.No one is able to have a clue about the supplying on local market where you live, but at least the above link was provide with the "with stock" option marked therefore all that appears there are available to buy. Since your forum profile is incomplete we don't know where do you live so, there is no way to know if such distributors serve your region, but most of them are worldwide; By the way, it is unclear if any issues remain on this regard, didn't you find any other part that meets your requisites?
What PNP transistor would you recommend for switching 800-900mA
Perhaps heat dissipation is an issue? A lot depends on package size. If the device drops 0.6 V then it is dissipating 1/2 W. Too hot for me to grip between my fingers.
I would start with a TO-3. If it doesn't get uncomfortably hot, then I'd try a TO-220.
TO-92 size might be okay but only if you can drive it so it doesn't dissipate more than 400-500 mW. Consider wrapping it with a heatsink which has several fins.
Hello Boylesg,
I'm in the suburb of Werribee myself and I either go to Jaycar for minor bits and pieces,
but I use WES Components when I need to buy in bulk or where Jaycar doesn't stock an
item.
WES has one of the largest ranges of semi-conductors, passives, tools, spare parts etc. in
Australia.
Check their on-line store catalogue after you register and I'm sure you'll be amazed at their
product range. Click on the link below:
WES Components
How about using a BD140 transistor?
It can easily handle the 800~900mA required by your circuit. Plus it can be mounted on a
heatsink such as this one:
Heatsink
By the way, are you sure about that IC number you quoted? i.e. MCP2017
I can't find any info on it.
Regards,
Relayer
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?