- Joined
- May 20, 2017
- Messages
- 162
Can you share the specific LM340 spec sheet you are looking at? How are you confirming the same heat dissipation?
BTW, I am sure anyone who's read this far into this thread knows about heat sink compound.
Since I have the document open in front of me, and what may help you interpret the doc, if you look on the second page for LM140A/340A, not at the top for input voltage where they show the performance based on three input voltages: 10, 19, and 23. . The table shows you the expected performance for the three evaluated voltages (10, 19, and 23) but the device can assume any voltage between that range (inclusive) but can be driven all the way up to 35 V. So 12V is clearly an OK input voltage.