| 641921 | H21B1 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641922 | H21B1 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641923 | H21B2 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641924 | H21B2 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641925 | H21B3 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641926 | H21B3 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641927 | H21B4 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641928 | H21B4 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641929 | H21B5 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641930 | H21B5 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641931 | H21B6 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641932 | H21B6 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641933 | H21L1 | ISO - LOGIC INVERTER SCHMITT TRIGGER INTERRUPTER SWITCH | ISOCOM |
| 641934 | H21L2 | ISO - LOGIC INVERTER SCHMITT TRIGGER INTERRUPTER SWITCH | ISOCOM |
| 641935 | H21LOB | OPTOLOGIC ® OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641936 | H21LOI | OPTOLOGIC ® OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641937 | H21LTB | OPTOLOGIC ® OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641938 | H21LTI | OPTOLOGIC ® OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641939 | H22-1 | ZENER DIODES | Micro Commercial Components |
|
| 641940 | H22-2 | ZENER DIODES | Micro Commercial Components |
| 641941 | H22-3 | ZENER DIODES | Micro Commercial Components |
| 641942 | H222 | Quad 2-input (passive pull-up) NAND | SGS-ATES |
| 641943 | H222 | Quad 2-input NAND gate (passive pull-up) | SGS-ATES |
| 641944 | H224 | Exp. dual 4-input (passive pull-up) NAND | SGS-ATES |
| 641945 | H224 | Dual 4-innput expandable NAND gate (passive pull-up) | SGS-ATES |
| 641946 | H22A | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641947 | H22A1 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641948 | H22A1 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641949 | H22A2 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641950 | H22A2 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641951 | H22A3 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641952 | H22A3 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641953 | H22A4 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641954 | H22A4 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641955 | H22A5 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641956 | H22A5 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641957 | H22A6 | SLOTTED OPTICAL SWITCH | Fairchild Semiconductor |
| 641958 | H22A6 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
| 641959 | H22B1 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Fairchild Semiconductor |
| 641960 | H22B1 | SLOTTED OPTICAL SWITCH | QT Optoelectronics |
