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, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, 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.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm 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!
Maker Business — Pololu’s account of the chip shortage
Wearables — More manicure tools for rugged circuits
Electronics — Probes aren’t perfect!
Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython Multitasking, Dune Gom Jabbar and more! #Python #Adafruit #CircuitPython @micropython @ThePSF
Adafruit IoT Monthly — Coffee Routine, IoT Cat, ESP32-S2 Feather, and more!
Microsoft MakeCode — MakeCode Thank You!
EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 12/1/2021 Featuring Adafruit Gift Certificates! (Video)
No comments yet.
Sorry, the comment form is closed at this time.