Non-Recurring Engineering
Meaning ~ Non-Recurring Engineering is the one-time cost itemized in supply agreements to cover custom tooling, design, and testing required to initiate manufacturing.
Pogo Pin
Meaning
Spring-loaded electrical connectors that maintain a reliable temporary contact between two points on a circuit or between a test fixture and a device under test facilitate the rapid assessment of electronic components. Each pogo pin consists of a thin metal tube, a small internal spring and a sharp or rounded plunger that makes the actual contact. These pins are designed to be compressed thousands of times without losing their electrical conductivity or their mechanical tension.
The boundary of the technology is defined by the maximum current the spring can carry and the minimum physical diameter required to fit the components inside the tube. It governs the accuracy of high-volume testing by ensuring that every contact point receives a clean signal during the measurement cycle.
Spring Force
Compression of the plunger must be strong enough to break through any oxidation or contamination on the surface of the test pad. This pogo pin relies on a specific spring rate that is measured in grams or ounces of force. If the force is too low, the connection will be unstable and cause the test results to fluctuate.
If the force is too high, the sharp tip of the pin will damage the gold plating on the circuit board or even puncture the copper trace. Engineers select the tip shape based on the type of contact being made, using pointed tips for flat pads and cup-shaped tips for solder balls. The travel distance of the plunger allows the pin to compensate for slight height differences between components on the board.
This flexibility ensures that every pin in a large array makes a solid connection at the same time.
Signal Consistency
Conductive materials like gold or rhodium are used to plate the parts of the connector to reduce electrical resistance. Inside the pogo pin, the path of the electricity usually goes through the plunger and into the barrel, sometimes bypassing the spring itself to avoid signal distortion. This is important for high-frequency testing where any change in the path can ruin the measurement.
If the plating wears off, the base metal will oxidize and create a high-resistance contact that looks like a failure to the test software. Technicians must monitor the resistance of the pins over time to catch this wear before it impacts the yield of the factory. A dirty pin can be cleaned with a specialized brush or a blast of dry air to remove debris.
When a pin is bent or the spring fails, it must be replaced immediately.
Durability Rating
Life cycles for these components are typically rated between ten thousand and one hundred thousand compressions depending on the quality of the materials. This pogo pin is a consumable item that will eventually fail due to mechanical fatigue or surface wear. Large test fixtures use thousands of these pins, so the cost of replacement can be a significant part of the maintenance budget.
Buying cheap pins is often a mistake because they fail sooner and cause more false rejects in the testing process. The manufacturing plant should keep a stock of spare pins on hand to minimize downtime when a failure occurs. High-performance pins used in semiconductor testing have even stricter requirements for precision and durability.
A well-managed test station keeps a log of how many cycles each pin has completed to predict when they will need to be changed.