First pass yield

First Pass Yield ( FPY also Abbreviation ) is a measure of the quality assurance and quality management. The FPY describes the number of components or assemblies, which after the initial production run - are without error - that is, without repair steps. Thus it corresponds to the "yield" in the production of semiconductors.

Unit of measurement

Often the FPY is given as a measure analogous to the percentage calculation. A yield of 86 means that 86 out of 100 units comply with the specifications. The higher the FPY, the higher the profitability of their quality. Another option is to specify in the unit DPMO (defects per million opportunities ) or ppm (parts per million).

Chained production process

If a production process of several steps, then the FPY calculated (the total yield) for the entire manufacturing process as the product of the individual FPY data

Example: A production process for 100 pieces is composed of four consecutive operations (AG 1, AG 2, AG 3, AG 4 ) together. Need to determine the FPY this the FPYs the individual operations identify and multiplied:

  • WG 1: 100 pieces fall from 10 pcs, you get 90 good parts. FPY = 90/ 100 = 0.90
  • WG 2: 90 piece fall of 10 pieces, you get 80 good parts. FPY = 80/90 = 0.89
  • WG 3: 80 Pieces fall from 5 pcs, you get 75 good parts. FPY = 75/80 = 0.94
  • AG 4: from 75 pieces fall from 5 pcs, you get 70 good parts. FPY = 70/75 = 0.93
  • The FPY for the whole process = FPY FPY AG AG 1 * 2 * 3 * AG FPY FPY AG4

So: 0.90 * 0.89 * 0.94 * 0.93 = 0.70 From 100 pieces so are 70 units in the first process run without rework as major chunk - Alright ( IO) - emerged.

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