PCB Cleaning Chemistry Choice: Matching the Soil Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB cleaning chemistry choice gives you a practical advantage when you…

PCB Flux Residue Effect: What Is Left Behind Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB flux residue effect gives you a practical advantage when…

PCB Reflow Soak Zone Purpose: The Quiet Part Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB reflow soak zone purpose gives you a practical advantage…

PCB Peak Temperature Window: How Hot Is Enough Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains…

PCB Solder Wick Technique: Removing What Should Not Be There Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This…

Second Source: Second-Source Qualification: Proving a Replacement Is Equivalent A second source is introduced to reduce risk, and introducing one carelessly creates a different risk in its place. The work is in demonstrating that the replacement behaves like the original in the ways that matter, which is usually a smaller…

Heat Sink Attachment and Thermal Interface Materials Fitting a heat sink looks like a mechanical task, but most of the thermal performance is decided by what happens at the interface. Two surfaces that appear flat touch only at microscopic high points, and the air between them is one of the…

Thermoelectric Cooler Driver Design Guide A thermoelectric cooler moves heat rather than generating cold, and the amount it moves depends on the current through it in a way that is close to linear. That makes the drive circuit a precision current source rather than a power switch, and it makes…

Solder Alloy Selection: SAC305, Low Temperature and High Temperature The alloy in a solder joint is chosen once and then inherited by every product that follows. It determines the reflow temperature, the joint strength, the behaviour at high temperature and the cost, and the trade is different for each product.…

Black Pad in ENIG: Causes and Solder Joint Failure Black pad is the name given to a dark, brittle layer that forms on the nickel surface of an electroless nickel immersion gold finish, and it produces solder joints that look acceptable and fail without warning. The gold itself is not…