Glass-to-metal hermetic seal manufacturers benefit from using our specialty lead frames, since the frames can be post-etched to radius all edges, preventing glass cracking. PEI can also post-etch the lead frames to promote firmer adhesion by radiusing the edges which promotes adhesion to the glass. Alternatively, PEI can use a kovar bright-dip that minimizes any glass fracture. For the “matched seal” type of glass-to-metal seal, where the frame and the glass have similar coefficients of thermal expansion, the strength of the seal comes from the chemical bond between the glass and an oxide formed on the metal parts. Typical applications of these types of lead frames are RF/Microwave hybrid or microcircuit packages, vacuum components, sensor or transducer housings, feedthroughs for harsh environments (especially valuable for military applications), housings for optoelectronic components, battery headers, and implantable medical devices.
A significant advantage of photochemical etching is the ability to reproduce large quantities of parts without tooling “wear,” so the millionth part is exactly the same as the first part. Changes to tools can be implemented very quickly, and phototools are significantly less expensive than traditional tooling methods—ideal for manufacturing various parts or lead frames from prototype to production quantities. Turnaround time using phototools is about 90% less than that for stamped frames.
All of PEI’s custom lead frames are proudly made in the U.S.A.
Please view our photo gallery for sample applications.