[time-nuts] FEI-565A part

Javier javier at nebulosa.org
Mon Feb 5 07:15:22 EST 2007


Hello,

It is probably a TLC27M24BI quad opamp from Texas Instruments, 
http://focus.ti.com/docs/prod/folders/print/tlc27m4b.html

Regards,

Javier, EA1CRB

geraldm at iprimus.com.au wrote:

>Hi all,
>
>Have decided to get stuck into fault finding my 5650A again. With no replies
>from FEI over the past 2 months, have decided to trace out the PCB the good
>old fasioned way, however the only IC on the 1 inch square PCB PCB has me
>completely lost.
>
>So to the question, has any one ever come across a device marking of 27M4Bl
>or possibly a bad i(I) not an L(l)??
>
>It's a SMD 14 pin Case751, with Gnd on pin 11 and Vcc on pin 4. This device
>is on the Rubidium lamp PCB and forms part of the Rb thermal control circuit.
>
>I am leaning towards a quad op amp, but it's possible failure makes it very
>difficult to diagnose, it could also be a comparator.
>
>Any suggestions are welcome.
>
>Regards
>
>
>Gerald
>
>
>
>
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