What is FPY?
FPY (First Pass Yield) is a manufacturing quality metric that measures the percentage of units that pass all tests and inspections on the first attempt, without requiring rework, repair, or retesting. In 5G device and base station manufacturing, FPY is a critical efficiency indicator — especially for complex RF components like massive MIMO antenna arrays, mmWave modules, and beamforming ICs where calibration and tuning processes are both time-consuming and costly.
How Does FPY Work?
FPY is calculated as the number of units passing all test steps on the first attempt divided by the total number of units entering the process. For 5G manufacturing, the test process typically includes RF parametric testing (output power, EVM, ACLR, receiver sensitivity), functional testing (protocol stack, signalling), and OTA testing (for FR2 devices). Each additional test or rework cycle adds cost and reduces throughput. Improving FPY requires tight control of component variation, optimised calibration algorithms, and well-designed production test sequences.
Use Cases
5G NR UE production line efficiency monitoring, massive MIMO base station manufacturing, mmWave front-end module production, RF component qualification, and supply chain quality management.
3GPP / Standards Reference
Industry manufacturing standards, IPC standards for electronics assembly, 3GPP conformance test specifications (as basis for production test derivation)
Related Terms
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This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
