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Electronic Chemical Etching

Photochemical Machining for Electronics

  • ETP and OFC Coppers, Beryllium Copper, Brass and Phosphor Bronze for electrical and electronic applications
  • Kovar, Nickel and Nickel/Iron alloys for semiconductor packages
  • M-Series Silicon Steel for transformer and motor laminations
  • Etched Direct Bond Copper on alumina or aluminum nitride for power applications

      
More Information About

Motor and transformer laminations: 

Custom, Prototype and Replacement

Typically produced from silicon steel alloys, also referred to as "electrical" steel or "M series" that have a surface finish called "coreplate" which creates a dielectric layer between laminations.  

Metal etching is an ideal solution for small to mid-range (dozens to many thousands) quantities of rotor and stator lams for motors and "I", "U" and "T" transfomer laminations.

Complex designs are easily produced from inexpensive tools (about $265.)

The chemical etching process leaves no burrs and imparts no mechanical or thermal stress: annealing is not needed.

 

photo etched brass leadframeMicroelectronics Packaging

Photo etching is the ideal solution for QFN and LD-MOS leadframes as well as a wide range of custom platforms.

QFN or "air-cavity" packages are widely used in RF and microwave communications applications due to the low attenuation loss.  These leadframes are typically very complex and delicate designs that are well suited to the capabilities of chemical etching.

Flat and step lids for hermetically sealed electronics packages are also readily produced by photochemical etching. Common alloys for these applications are often in the nickel-iron family and include Kovar, Invar, F-15, and others.

photo etched brass shielding box folded at assemblyEMI/RFI Shielding

Many electrically "noisy" products emit interference which must be contained by metal shielding in copper, beryllium copper, brass and others.

Chemical etching is a fast and economical means of producing both simple and complex enclosures and barriers to electromagnetic and radio frequency emissions.

Pictured is an example of an etched and formed enclosure for electronic assemblies.

Direct Bond Copper is another popular application for photo etching. A layer of copper is vacuum bonded onto an alumina ceramic base and a circuit is etched into the copper. Etched DBC parts are used in many RF/microwave applications including cell phones, wireless and and microwave transmitters.

Design Guide for Photochemical Machining

 
Semiconductor Leadframes
 


 
laser printer toner dispersion screen photo etched in stainless steel
Digital Printer Component
 
matte tin plated photo etched becu shield
RF Shield Component
 
etched phos bronze contact spring
Radial contact spring
 
etched brass wi-fi components
Various microwave antenna parts
 
etched and formed miniature slip ring contactor
Miniature contact plate 5/8" diameter
 
photo etched formed and gold plated slip ring brush contact
Circular contact brush
 
etched brass retainer with half etch pockets
Electronic retainer
 
etched copper leadframe
Lead frame
 
etched brass wi-fi element
Antenna component
 
photo etched DBC components
Cell phone circuit components
 

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