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Some suggestions for parts in the OPL

Posted: Tue Jan 14, 2014 1:09 am
by jwatte
I'm re-doing a project I have using only OPL parts. I ran into the following missing capabilities:

- There is no 22K chip resistor. I had to use two 10K resistors in two places.

- There is no 470 or 660 or 680 resistor. These are nice when current limiting LEDs. I ended up using a 390, which sources more current than I'd want.

- There is no small 5V regulator with high input range. There's only a really big 7805 which is 2V drop-out and really big, and 1117 which maxes out at 16V input (i need at least 21V for a 5S LiPo input, and some margin would be nice.) The previous version of this project uses a MCP1804, which is a great 5V regulator! (Microchip, 150 mA, 230 mV drop-out, up to 27V input range.)

- There is no TVS suitable for higher-voltage inputs or outputs. I had been using a SMBJP6KE20A (Micro Commercial, 600W, 27.7V clamp)

- There are no power MOSFETs. The project uses PSMN011-30YL N-channel. (NXP, 30V, 37A)
Other projects of mine have used P-channel devices, such as the DMP3010LK3 (Diodes, Inc, 30V, 17A)

- Other commonly used parts include some switching power converter controller (might need a higher-power inductor to match,) and some N-channel MOSFET driver like the IRF2101, 2183, or similar.

Currently I am using multiple resistors, and I'm planning to have to solder the power MOSFETs and the TVS myself.

Btw: I had Digi-Key URLs in the item descriptions but the forum wouldn't let me post them.

Re: Some suggestions for parts in the OPL

Posted: Wed Jan 15, 2014 10:07 am
by jwatte
Another issue: the N-channel transistor that is available is only 20 V DS and 8 V GS.
I'd like a small N-channel transistor with at least 30 V DS and 20 V GS. This is useful for:
- Reverse polarity protection on input. GS needs to be maximum supported input voltage.
- Backflow prevention after a bipolar regulator like the 7805 or 1117. (A CMOS regulator like the MCP1804 doesn't need this.)

Re: Some suggestions for parts in the OPL

Posted: Wed Jan 15, 2014 6:32 pm
by shuyang
Hi there,
WOW!! Thank you so much for giving us suggestion! that is really useful for us!
I have written them down and will discuss with our EE one by one. I will try my best to put all the commonly-used components in OPL.

Thank you again! if you want to give us the digikey code, you can send the E-mail directly to shuyang@seeedstudio.com
Thanks´╝ü
Shuyang

Re: Some suggestions for parts in the OPL

Posted: Wed Jan 09, 2019 4:40 pm
by catherine12297
The N-channel transistor that is accessible is just 20 V DS and 8 V GS.

I'd like a little N-channel transistor with no less than 30 V DS and 20 V GS. This is helpful for:

- Turn around extremity insurance on info. GS should be most extreme bolstered input voltage.

- Reverse counteractive action after a bipolar controller like the 7805 or 1117.