25. Transistor Alternatives

Question.3

You are selecting a second-source transistor so your design does not depend on a single manufacturer.
Multiple alternatives appear to have similar voltage, current, and package, but reliability is critical.

What is the most important check when choosing a true second-source part?

The alternative part has the same top marking
The alternative part matches all critical electrical and thermal specifications
The alternative part is cheaper
The alternative part comes from a well-known brand

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