The following IC Linear Voltage Regulators have the desired 12V max input and 3.3V at 100mA output, but have higher quiescent amperage than your ideal solution:

 - `ADP3301ARZ-3.3-RL`
 - `ADP3309ARTZ-3.3-R7`
 - `ADP3301ARZ-3.3`

I have record of another Linear Voltage Regulator that has the above qualities and a quiescence of 1.1µA, `NCP78LC33NTRG`, but it is no longer being manufactured and will therefore be harder to obtain.
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