I'm no expert on these devices. But it does sound like the BT136 is overkill for you. You need only low-100's of mW dissipation when on. So smaller packaging would seem possible. The I^2s (fusing) spec would be something else to consider. The BT136 seems to suggest 17 A for 10 ms maximum. I can't imagine you needing anything like that. So a lower fusing spec would likely also be fine. What device do you have in mind, though? Perhaps that's important to add to the question.
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