← back to legend
Validation & fab

HASL

Hot Air Solder Leveling
Cheapest, most common PCB surface finish. Tin-lead or lead-free.

How it looks

Drawing: CORE3588 uses ENIG, not HASL
boardcopper padsolder coat: domed and uneven
A pad finished with HASL, seen from the side (height exaggerated). The coat is real solder, so it is thicker in the middle than at the edges.

How it works

boardcopper padbare copper tarnishes in days and solders badlydip the board in molten solderhot-air knives blow off the excesscheap and solders well, but not flattiny pads get uneven amounts

Where it fits

The alternative is ENIG, flat and gold, which CORE3588 uses. Finish choice is part of DFM and of the fab order.

← back to legend