Lead-free surface mount polymer PTCs

13 July 2005 Circuit & System Protection

Bourns Multifuse Polymer PTC lead (Pb)-free surface mount components' (the MF-SMDF, MF-MSMF, and MFNSMF) standard metal termination finish is electroless nickel immersion gold (ENIG).

This finish gives the components long shelf life and the precious-metal topcoat provides excellent electrical connectivity. The ENIG finished components fully comply with the solderability characteristics defined in the joint industry standard ANSI/J-STD-002 Category 2.

Bourns also offers an alternative electroless 100% tin (Sn) termination finish to the standard ENIG finish. This option is available for applications requiring the soldering characteristics of ANSI/J-STD-002, Category 3.

* Category 2 - typical coating durability for non-tin and non-tin-lead finishes: This category is intended for surfaces finished with other than Sn or Sn/Pb coatings that will be soldered after an extended time from the time of testing. Standard Bourns Multifuse Polymer PTC surface mount products have an ENIG coated terminal consistent with this category. These parts fully comply with the tests and procedures outlined in Category 2.

* Category 3 - typical coating durability default for tin and tin lead finishes: A category intended for surfaces finished with Sn or Sn/Pb coatings, which will be soldered after an extended storage from the time of testing. The Bourns Multifuse Polymer PTC devices with an optional Sn finish fall into this category and all products with the optional Sn finish meet or exceed the requirements of this category.

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