'e' number coding in packing label

Sometimes, you may find an ‘e’ number on the packing label for your parts, such as ‘e0’. This ‘e’ number code aligns with the JEDEC standard J-STD-609, and often calls out what material is on the leads according to a JEDEC defined set of PB-free finish options.

JEDEC J-STD-609 is a standard to meet the needs of components manufacturers to provide a marking standard. It describes the lead free surface or terminal finishes and materials, and PB-free assembly solders. The following ‘e’ numbers codes are used:

  • e0 - contains intentionally added lead (Pb)
  • e1 - tin-silver-copper (SnAgCu) with silver content greater than 1.5% and no other intentionally added elements
  • e2- tin (Sn) alloys with no bismuth (Bi) nor zinc (Zn), excluding tin-silver-copper (SnAgCu) alloys in e1 and e8
  • e3 - tin (Sn)
  • e4 - precious metal (e.g., silver (Ag), gold (Au), nickel-palladium (NiPd), nickel-palladium-gold (NiPdAu) (no tin (Sn))
  • e5 - tin-zinc (SnZn), tin-zinc-other (SnZnX) (all other alloys containing tin (Sn) and zinc (Zn) and not containing bismuth (Bi))
  • e6 - contains bismuth (Bi)
  • e7 - low temperature solder (≤ 150 ºC) containing indium (In) [no bismuth (Bi)]
  • e8 - tin-silver-copper (SnAgCu) with silver content less than or equal to 1.5%, with or without intentionally added alloying elements. This category does not include any alloys described by e1 and e2 or containing bismuth or zinc in any quantity.
  • e9 - symbol - unassigned
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