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Topic: Need replacement or equivalent components for Arduino Duemilanove (Read 649 times) previous topic - next topic

Feb 08, 2013, 03:36 pm Last Edit: Feb 09, 2013, 03:51 am by djsong121 Reason: 1
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

MarkT

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.
[ I won't respond to messages, use the forum please ]

retrolefty


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

#3
Feb 09, 2013, 03:34 am Last Edit: Feb 09, 2013, 03:51 am by djsong121 Reason: 1
Got it will be replacing MC33269 with 7805 Voltage regulator both give +5 V...
Now just need NDT2955T replacement...

       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

CrossRoads

Why not use the same parts
http://www.digikey.com/product-search/en?lang=en&site=us&KeyWords=NDT2955T&x=15&y=15
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.


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...

CrossRoads

??
Isn't this the part?
3.     NDT2955       P       MOSFET       3       60V                  2.5        150                   0.3       SOT223
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

westfw

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.

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