Any questions you have before you begin buying, building and installing.
User avatar
By erdem325
#22416
hi everyone.
i have some questions..

can i use 1n5819 schottky diode for 1n5818 schottky?

i can not find tc4424epa, what can i use alternative?

and, can i use irfz44n for stp75ns04z?
User avatar
By turboedge
#22417
erdem325 wrote:can i use 1n5819 schottky diode for 1n5818 schottky?
Yes
erdem325 wrote:i can not find tc4424epa, what can i use alternative?
Yes there are many, TC4424AVPA, IXDN602PI, IXDN604PI, and more. If none of those work say so and someone can probably find some others.
erdem325 wrote:and, can i use irfz44n for stp75ns04z?
I would not, it does not have the protection that the stp75ns04z does, but you can use STP62NS04Z.
User avatar
By PSIG
#22462
erdem325 wrote: Fri Nov 17, 2017 9:51 pm... and, can i use irfz44n for stp75ns04z?
I also would not use the IRFZ44 type, as it is designed to operate efficiently with a much higher signal voltage, far above the 4 to 5V Speeduino uses to signal the MOSFETS. If substituting MOSFETS, always look to source a "logic-level" part. While I also agree that the protections on the STP parts are preferable, and only as an example, the IRLZ44 type would be more suited for a logic-level signal.

David

The RDS(on) indicates the signal voltage at which the device reaches minimum resistance (full turn-on). This is the IRFZ44, which requires 10V:
IRFZ44 Spec.png
IRFZ44 Spec.png (20.39 KiB) Viewed 10027 times
And this is the IRLZ44. Note the RDS(on) is much closer to the signal voltage Speeduino uses, and will very nearly turn fully on, for better switching performance and less heat:
IRLZ44 Spec.png
IRLZ44 Spec.png (20.48 KiB) Viewed 10027 times
User avatar
By erdem325
#22468
turboedge wrote: Fri Nov 17, 2017 9:59 pm
erdem325 wrote:can i use 1n5819 schottky diode for 1n5818 schottky?
Yes
erdem325 wrote:i can not find tc4424epa, what can i use alternative?
Yes there are many, TC4424AVPA, IXDN602PI, IXDN604PI, and more. If none of those work say so and someone can probably find some others.
erdem325 wrote:and, can i use irfz44n for stp75ns04z?
I would not, it does not have the protection that the stp75ns04z does, but you can use STP62NS04Z.
thank you so much.
User avatar
By erdem325
#22469
PSIG wrote: Sun Nov 19, 2017 7:53 pm
erdem325 wrote: Fri Nov 17, 2017 9:51 pm... and, can i use irfz44n for stp75ns04z?
I also would not use the IRFZ44 type, as it is designed to operate efficiently with a much higher signal voltage, far above the 4 to 5V Speeduino uses to signal the MOSFETS. If substituting MOSFETS, always look to source a "logic-level" part. While I also agree that the protections on the STP parts are preferable, and only as an example, the IRLZ44 type would be more suited for a logic-level signal.

David

The RDS(on) indicates the signal voltage at which the device reaches minimum resistance (full turn-on). This is the IRFZ44, which requires 10V:
IRFZ44 Spec.png

And this is the IRLZ44. Note the RDS(on) is much closer to the signal voltage Speeduino uses, and will very nearly turn fully on, for better switching performance and less heat:
IRLZ44 Spec.png
ah ok, now i understand.
here in turkey i can not find any mosfets STPs..
the best way irlz..
thanks..
By Sepehr20mg10
#23898
Hi friends

I have the same some questions

Which Mosfet is better from below selections (for injector drivers)?
1. IRLZ44N
2. STP90NF03L
3. STP55NF06

And can I replace TC4424EPA with TC4424CPA?

Thank's
User avatar
By PSIG
#23899
126p wrote: Fri Jan 26, 2018 8:41 amCould DRV8825 be replaced by EasyDriver?
It would appear you can. If you happen to have one already, you can try it (full-step mode), with my primary concern being the much lower amperage it can deliver compared to the DRV8825. If you don't have one, then it would be simpler and less expensive to use a DRV. Just the Allegro chip alone is about the price of a complete DRV clone module if making your own with original-source parts. Assembled from licensed sources is approaching double the cost of an original Pololu DRV8825. If you try an EasyDriver, please report your findings for others here.

David
User avatar
By PSIG
#23901
Sepehr20mg10 wrote: Fri Jan 26, 2018 10:09 amWhich Mosfet is better from below selections (for injector drivers)?
1. IRLZ44N
2. STP90NF03L
3. STP55NF06
Welcome! Please realize we cannot spend much time doing research for others. Please read the post above about "logic level". In this case I will answer with my opinion:
1. The IRLZ44N can work, is 60V, logic-level, and avalanche rated, though it is not 'clamped' like the STPs in the BOM. It will probably work OK.
2. The STP90NF03L gate voltage is rated at 10V, with no rating for logic-level. Not recommended. See earlier post.
3. The STP55NF06 also not recommended due to 10V gate drive. :arrow: However, the version STP55NF06L can work ("L" for Logic Level), is rated about the same as the IRLZ44N in most regards.
Sepehr20mg10 wrote: Fri Jan 26, 2018 10:09 am And can I replace TC4424EPA with TC4424CPA?
Yes, but know that the CPA is only rated to 70°C/158°F, so you would be closer to losing spark on a hot day with the parts running in a a closed case. EPA is better at 85°, and AVPA is best at 125°.

David

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