Name that chip

[junkjer]

Hi-

I'm new here, and not much more than an electronics newbie. Would anyone be able to help me identify and find a datasheet or other details for this chip?

An image is attached (I hope).

The markings are:

NEC
C551E6S1D

It has ten pins, and in this application pins 1, 4, 7, 8, are not used. It's from a film camera circa 1975.

I've tried a web search but have had no luck getting anything but garbage results.

Thanks in advance.

[amyk]

uPC551E is its likely part number, following the rest of NEC's convention.

Unfortunately no hits in the databooks I could find either, but it may be an opamp - trace the circuitry around it and see how it's connected.

[5U4GB]

I'd be more curious to know about the MDF-based circuit board technology they're using :-).

[junkjer]

amyk- Thanks, when I have some time over the next few days I'll try to examine the circuit around the chip. This came out of a camera circa 1975, the last in a line of aperture-priority automatic exposure cameras that were cutting edge in '66. This camera had an upgraded metering system using a silicon photo diode.  My reading tells me SPDs need amplification, so it seems likely this chip is an op amp.

5U4GB -- as this was the last in its line, I imagine not much money went into the design, so the circuit board was... cheap.  In fact, the unit I pulled it from had nasty water damage throughout, and part of the board (not seen in the pic) had soaked up some water. Also around '75 the same company was making SLRs with surface mount chips and components on ribbon-like circuit boards. That's where the energy and money went, I guess.

[junkjer]

And here's a look at the parts connected to the chip.