I've never encountered anything in this package. Is it a crystal oscillator? What are the six pins used for? Would it potentially be ovenized?

All I know is that the manufacturer is Kyocera. Any help greatly appreciated!

Markings: Kyocera 7M37 012C M1

Logic chips, DIP-8 oscillator, and HC-49/U resonator are included for size reference. The circular things in the middle are the mystery devices of interest. I did not clip off two of the leads - they're all like that. image

  • \$\begingroup\$ I saw relays in such packages \$\endgroup\$
    – Eugene Sh.
    Jan 22, 2021 at 22:56
  • \$\begingroup\$ Is this it? (7.37MHz xtal or oscillator). No idea what the pinout is. ebay.co.uk/itm/… \$\endgroup\$
    – Digiproc
    Jan 22, 2021 at 23:09
  • 2
    \$\begingroup\$ The 2 on the right are a crystal oscillator and a crystal. The round 6-pin packages may well be filters - possibly SAW filters (TV VSB IF or chroma filter) or a delay line from a PAL or SECAm colour TV. \$\endgroup\$ Jan 22, 2021 at 23:10
  • 1
    \$\begingroup\$ If I had to guess it is a crystal oscillator complete with driver(s) on chip. I could not find data about it online but it can be ordered if they have any left. \$\endgroup\$
    – Gil
    Jan 23, 2021 at 3:23

1 Answer 1


enter image description here I have recently acquired some of these myself and was searching for info which landed me here. I was able to solve more of this mystery on my own. By orienting the tab on the can to be pin number one following the traditional DIP design. Using pin 3 as +5V and pin 4 as the ground I was able to obtain a surprising and desirable output. Four outputs exactly. Included is my not so professional schematic . The quiescent current is a low 1.25ma so i am confident that my efforts have amounted to something. With four stable outputs at different frequency's this device truly has much potential on the bench and with a few discreet components one can produce many different wave forms. I am sure this device has more secrets as well. It took some effort but I am glad to help others and myself.

  • \$\begingroup\$ Wow, this is excellent info. Thank you for your time and effort! \$\endgroup\$
    – crossroad
    Feb 9, 2021 at 16:07

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