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78M05, what's so special?
FunnyNYPD
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发表于2017-05-13 00:59:03 | 显示全部楼层
1# 电梯直达

There are many vendor makes the 78M05 at different price, what makes them different?
Other than the package material, the most critical thing is the silicon design, in other words, how many active transistors are used. 

Here is what I have found:
1. OnSemi, MC78M05BDTRKG, 28 active transistors.
2. Diodes, AS78L05RTR-E1, 24 active transistors. 0.1A, not a 78M05 device, but similiar.
3. Rohm BA78M05FP,  18 active transistors.
4. ST, L78M05ABDT-TR, 17 active transistors,
5. UTC 78D05AL, 78D05LL, 78D05L, 15 active transistors,

The following are the schematics posted on their data sheets:
1. OnSemi, MC78M05BDTRKG,contains 28 active transistors.

 

2. The Closest Competitor: Diodes, AS78L05RTR-E1, 24 active transistors:

 


3. The second closest competitor: Rohm, BA78M05FP, 18 Transistors:



4.The third closest competitor: ST L78M05ABDT-TR, 17 Transistors

 

5.Other competitors uses 15 or less transistors: UTC, 78D05AL, 78D05LL, 78D05L, 15 transistors,

 

立创商城工程部
【官方工作人员】
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发表于2017-05-13 09:41:10   |  显示全部楼层
2#
What your analysis is very detailed! 
Although, the number of transistors is not the only factor of chip quality grades . 


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