What is the black dot on IC?

What is there inside the big black dot on integrated circuits? – Quora. The circuit itself. The big black blob is a covering of nonconducting paste that is there to protect a fragile wafer of carefully grown and layered silicon. The blob also acts as a heat dissipation sink.

How do you remove black epoxy from a PCB?

Heat the epoxy residue with a soldering iron set to 500-600°F. The epoxy will soften and lose adhesion, and can then be easily scrapped off. Again, this removal method can be used on metal, glass or any surface that will not be adversely affected by high temperatures, not PCB material.

Why are ICs black?

Why IC’s are black in color, why not white? Since black is absorbent of heat and hence IC may get heated quickly. If IC are white in color this problem may be reduced considerably.

What is COB in PCB?

Chip-on-board (COB) technology involves attaching a semiconductor die directly to a PCB substrate with adhesive, wire bonding it to a circuit pattern already present on the board, and then encapsulating it.

Why are chips covered in epoxy?

In “wire bonding”, the chip is attached to the board with an adhesive. In all cases, the chip and connections are covered with an encapsulant to reduce entry of moisture or corrosive gases to the chip, to protect the wire bonds or tape leads from physical damage, and to help dissipate heat.

How do you get black epoxy off?

Soak a paper towel or cloth with vinegar and gently rub it on the affected area until the epoxy softens enough to peel off. No luck? Acetone, or acetone-based nail polish remover, can also be applied to a paper towel and used in the same way, but do so with care.

How do you remove black resin?

Use enough acetone to soak into the surface a bit. Be careful not to damage the wood/concrete as you use your knife or scraping tool to gently and slowly scrape off the epoxy resin. There is no need to worry about any wet areas left by the acetone as it will evaporate on its own.

What is chip Flex?

What is Chip-On-Flex (COF)? Chip-On-Flex is where the LCD driver is mounted directly to a flexible circuited board. These. IC-Flex combinations would come from the driver manufacturer on a reel form referred to as. TAB, or tape automated bonding.

What is chip on board LED technology?

Chip-on-Board LED technology describes the mounting of a bare LED chip in direct contact with the substrate to produce LED arrays. It is a method of LED packaging which has a number of advantages over conventional technologies such as “T-pack” and Surface Mount LEDs.