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I'm looking to find out what these parts are on a PLC controller.

Both are SOT-89 packages.

The AE P04 I suspect maybe something to do with a constant current circuit for +24vDC for a 4-20mA loop sensor therefore I think this could be a LDO regulator.

The BE P04 appears to be part of a 0-10vDC output. Is this likely to be another LDO regulator used for constant current?

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  • \$\begingroup\$ Maybe pO4? Seems like an NPN transistor \$\endgroup\$ – Ashton H. May 30 '14 at 10:41
  • \$\begingroup\$ Fairly sure its not unless its a dual package of some sort. SOT-89 has four pins. The output circuit is buffered using NPN transistors however I have two small SOT23 devices that I assumed were this buffer. \$\endgroup\$ – StuntMonkeh May 30 '14 at 15:31
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Given the component layout I was incorrect in assuming the two small SOT23 devices were NPN transistors.

A bit of further investigation using s-manuals siteleads me to believe that BE P04 is a BCX55TA and is indeed part of the output buffer with a BCX19. The other small SOT23 device was a BAV70.

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