JEDEC Standard No. 557D
-i-
STATISTICAL PROCESS CONTROL SYSTEMS
Contents
Page
Introduction ........................................................................................................................................... ii
1 Scope .......................................................................................................................................... 1
2 References ................................................................................................................................. 1
3 Terms and Definitions .............................................................................................................. 1
3.1 Terms and definitions used in this document ............................................................................. 1
3.2 Other terms related to SPC/SQC ................................................................................................ 3
4 General SPC System Requirements ....................................................................................... 4
4.1 Overall Quality System .............................................................................................................. 4
4.2 Management commitment .......................................................................................................... 4
4.3 SPC system set up ...................................................................................................................... 4
5 Performing SPC ........................................................................................................................ 5
5.1 Measurement system analysis (MSA) ........................................................................................ 5
5.1.1 Calibration/Verification records ................................................................................................. 5
5.1.2 Gage characterization and capability.......................................................................................... 5
5.2 Characterize and classify SPC parameters ................................................................................. 5
5.3 Process capability ....................................................................................................................... 7
5.3.1 Normal or transformed data Cpk ................................................................................................ 8
5.3.2 Quantile Cpk .............................................................................................................................. 8
5.3.3 Control limits .............................................................................................................................. 8
5.4 Set-up per SPC parameter .......................................................................................................... 8
5.5 Training ...................................................................................................................................... 9
5.6 Supplier SPC systems ................................................................................................................. 9
5.7 Calibration .................................................................................................................................. 9
5.8 Self-audit .................................................................................................................................... 9
Annex A (informative) Control chart constants TL and TU as a function of sample size n ............. 10
Annex B (informative) SPC example ............................................................................................... 11
Annex C (informative) Alternative control charts ............................................................................ 13
Annex D (informative) Alternative for quantile Cpk ........................................................................ 15
Annex E (informative) Related books .............................................................................................. 16
Annex F (informative) Related guidelines and standards ................................................................. 18
Annex G (informative) Other terms and definitions related to SPC ................................................. 19
Annex H (informative) Differences between JESD557D and JESD557C ........................................ 22
Figures:
Figure 1 — Example of control chart ...................................................................................................... 7
Figure C.1 — Mean Value Chart calculated with formulas in 5.2 (left) and C1 (right). ...................... 13
Figure C.2 — Standard Deviation Chart calculated with formulas in 5.2 (left) and C2 (right). ........... 14
