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[on:]

Hi,
I am a newbie, trying to build Arduino Duemilanove.
However I am unable to get the following components:
MC33269 with 7805 regulator
NDT2955 MOSFET
Can i know the equivalent parts like them.
Thanks

[Reply #1 on:]

The AP1117 series of regulators might be a match (they are commonly available and low-dropout I believe - possibly
even the same pinout?)

Any p-channel logic-level MOSFET with an Rds(on) of 0.5ohm or less will probably do for NDT2955 - the voltage rating depends on where it
is in the circuit (if Vin, then 25V or more would be wise).  But I might be wrong - the MOSFET circuit may require
specific voltage response (its used for power source detection and switching I believe).  If you are not needing
supply switch-over then its probably not needed.

[Reply #2 on:]

The AP1117 series of regulators might be a match (they are commonly available and low-dropout I believe - possibly
even the same pinout?)

Any p-channel logic-level MOSFET with an Rds(on) of 0.5ohm or less will probably do for NDT2955 - the voltage rating depends on where it
is in the circuit (if Vin, then 25V or more would be wise).  But I might be wrong - the MOSFET circuit may require
specific voltage response (its used for power source detection and switching I believe).  If you are not needing
supply switch-over then its probably not needed.

The auto-voltage mosfet switch is only being used in +5vdc service, it doesn't see the Vin voltage level at all.

Lefty

[Reply #3 on:]

Got it will be replacing MC33269 with 7805 Voltage regulator both give +5 V...
Now just need NDT2955T replacement...

[Reply #4 on:]

       Polarity       Struct       Pd       Uds            Ugs       Id        Tj       Tr       Cd       Rds       Caps 
1.     CET6601       P       MOSFET       3       60V            20       4.3        150       4nS       95       0.086       SOT223 
2.     CET6861       P       MOSFET       3       60V            20       3.5        150       5nS       80       0.13       SOT223 
3.     NDT2955       P       MOSFET       3       60V                  2.5        150                   0.3       SOT223 
4.     SSM9575       P       MOSFET       3       60V            25       4        150       5nS       165       0.09       SOT223 
5.     WTN9575       P       MOSFET       3       60V            25       4        150       5ns       165       0.09       SOT223 
6.     ZXMP10A18G       P       MOSFET       3.9       100V            20       3.7                    1055       0.15       SOT223 
7.     ZXMP6A17G       P       MOSFET       3.9       60V            20       4.1                    637       0.19       SOT223 
8.     ZXMP7A17G       P       MOSFET       3.9       70V            20       3.7                    635       0.25       SOT223 

will any of one will replace NDT2955

[Reply #5 on:]

Why not use the same parts
http://www.digikey.com/product-search/en?lang=en&site=us&KeyWords=NDT2955T&x=15&y=15

[Reply #6 on:]

Why not use the same parts
http://www.digikey.com/product-search/en?lang=en&site=us&KeyWords=NDT2955T&x=15&y=15

srry i wont be able to purchase online...

[Reply #7 on:]

??
Isn't this the part?
3.     NDT2955       P       MOSFET       3       60V                  2.5        150                   0.3       SOT223

[Reply #8 on:]

The 7805 is NOT pin compatible with the mc33269!
Why not use an older circuit without the MOSFET (diecimilla?)
Auto power switching is of somewhat questionable usefulness.