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I cannot seem to find any information for this diode, or for the package. It is slightly bigger than a mini-MELF and has a repeating number 3 as cathode band. It meters like a normal silicon diode.

Any help would be much appreciated. unidentified diode, with mini-MELF for comparison

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    \$\begingroup\$ Try connecting a 1K resistor in series and apply about 6-10V in the reverse direction. \$\endgroup\$ – Spehro Pefhany May 19 at 7:34
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    \$\begingroup\$ Forward biased at 20mA, it has a .710 voltage drop, and I don't see an avalanche when reverse biased up to 50V. It seems like a normal silicon diode. What I am trying to find is the package, which I cannot identify, and hopefully the part number, so I can closely as possible match the forward current, recovery speed, and reverse voltage specifications. Thanks! \$\endgroup\$ – Manny Arias May 19 at 20:02
  • \$\begingroup\$ Maybe SOD-80 but check the dimensions carefully. \$\endgroup\$ – Spehro Pefhany May 19 at 20:07
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Eureka! It is a Philips BYD37K in the discontinued SOD-87 package.

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