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Semiconductor Yield Improvement Calculator

This form calculates the effects of a reduction of yield loss on the balance sheet of a fab.

Number of wafer starts per month
Wafer Size (mm)
Average number of devices/wafer
Average sale price of device ($)
Typical device yield (%)
Cost of raw wafer ($)
Cost of processing raw wafer ($)

Effect of a % reduction in bad devices:

Cost Reduction Calculation

This assumes that the extra capacity achieved by improving yield will be unused. Cost savings are therefore achieved through not processing as many wafers to achieve required production targets.

  • Cost of wafers scrapped
    = (100 - DeviceYield)% * WaferStarts * (WaferCost + WaferProcessingCost)
    = $ (100 - 80)% * 30000 * (150 + 600) /month
    = $ 4500000 /month
  • Amount saved by a reduction of 1% in the number of wafers scrapped
    = $ 1% * 4500000 /month
    = $ 45000 /month

If Q-YIELD allows you to achieve this target 1% reduction in bad devices, a typical fab wide installation will pay for itself in terms of reduced costs in 2.2 months.

Change Parameters

Increased Production Calculation

This assumes that the same number of wafers are processed, and thus more devices can be sold for the same processing cost.

  • Increased number of devices produced
    = WaferStarts * DevicesPerWafer * (100 - DeviceYield)% * LossReduction% /month
    = 30000 * 1000 * (100 - 80)% * 1% / month
    = 60000 / month
  • Increased profit
    = IncreasedNumDevices * DevicePrice /month
    = $ 60000 * 5 /month
    = $ 300000 /month

If Q-YIELD allows you to achieve this target 1% reduction in bad devices, a typical fab wide installation will pay for itself in terms of increased production in 0.3 months.

Change Parameters

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