what kind of Attiny45 is used in Lumen subsea Light, i did not find that in any pcb software library??
Hi @subham, welcome to the forum 
From the schematic that’s included in the technical details on our Lumen product page, it’s an ATtiny45-20 in an 8-pin surface mount package, and from the ATtiny datasheet the only relevant option is an 8-pin SOIC. From the datasheet’s ordering information table that would be one of ATtiny45-20SU / SUR / SH / SHR depending on the material finish on the pins, and whether it’s bought as individual chips or on a reel.
If that’s not what you’re asking about then please clarify. It may also help to know what you’re trying to achieve.
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@EliotBR where can i find this Attiny45 microcontroller, i have gone through every simulation software but couldn’t find one, any suggestion?
Hi @subham -
It’s easy to find that part for purchase - do the simulation software packages you’re searching have any microcontrollers at all? It would seem unusual to me to simulate a microcontroller, rather than just passive components that make up a circuit (resistors, capacitors, transistors, etc.)