Inter-metallic formation in Lead Free Solder after Thermal Cycling on reedit:
The inter metallics you can see are:
Ag3Sn – Needle like structures
Cu6Sn5 – blotchy spots all around solder ball and typically the layer between the ball and the pad(s)
This cross section was taken from a Package on Package components which was thermally cycled from -25 C to 125 C (30 min dwell) for 1000 cycles.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Join 13,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord
Have an amazing project to share? The Electronics Show and Tell with Google Hangouts On-Air is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/
Maker Business — Charitable business and the Buy-One Give-One angle
Wearables — Stitch marks
Electronics — Potentiometer conventions
Biohacking — Vitamin-C + Gelatin for Accelerated Recovery
Python for Microcontrollers — The Top Programming Languages 2019 – Python tops the charts with a CircuitPython nod! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit
Adafruit IoT Monthly — Adafruit IO Updates, RGB Stream Deck Message Panel, and more
Microsoft MakeCode — Welcome to the MakeCode Newsletter!
No comments yet.
Sorry, the comment form is closed at this time.