| 667921 | HEF4528BF | Dual monostable multivibrator | Philips |
| 667922 | HEF4528BN | Dual monostable multivibrator | Philips |
| 667923 | HEF4528BP | Dual monostable multivibrator | NXP Semiconductors |
| 667924 | HEF4528BP | Dual monostable multivibrator | Philips |
| 667925 | HEF4528BPB | Dual monostable multivibrator | Philips |
| 667926 | HEF4528BT | Dual monostable multivibrator | Nexperia |
| 667927 | HEF4528BT | Dual monostable multivibrator | NXP Semiconductors |
| 667928 | HEF4528BT | Dual monostable multivibrator | Philips |
| 667929 | HEF4528BT-Q100 | Dual monostable multivibrator | Nexperia |
| 667930 | HEF4528BU | Dual monostable multivibrator | Philips |
| 667931 | HEF4531 | 13-input parity checker/generator | Philips |
| 667932 | HEF4531B | 13-input parity checker/generator | Philips |
| 667933 | HEF4531BD | 13-input parity checker/generator | Philips |
| 667934 | HEF4531BF | 13-input parity checker/generator | Philips |
| 667935 | HEF4531BN | 13-input parity checker/generator | Philips |
| 667936 | HEF4531BP | 13-input parity checker/generator | Philips |
| 667937 | HEF4531BT | 13-input parity checker/generator | Philips |
| 667938 | HEF4532 | 8-input priority encoder | Philips |
| 667939 | HEF4532B | 8-input priority encoder | Philips |
|
| 667940 | HEF4532BD | 8-input priority encoder | Philips |
| 667941 | HEF4532BDB | 8-input priority encoder | Philips |
| 667942 | HEF4532BF | 8-input priority encoder | Philips |
| 667943 | HEF4532BN | 8-input priority encoder | Philips |
| 667944 | HEF4532BP | 8-input priority encoder | Philips |
| 667945 | HEF4532BPB | 8-input priority encoder | Philips |
| 667946 | HEF4532BT | 8-input priority encoder | Philips |
| 667947 | HEF4534B | Real time 5-decade counter | Philips |
| 667948 | HEF4534BD | Real time 5-decade counter | Philips |
| 667949 | HEF4534BF | Real time 5-decade counter | Philips |
| 667950 | HEF4534BN | Real time 5-decade counter | Philips |
| 667951 | HEF4534BP | Real time 5-decade counter | Philips |
| 667952 | HEF4534BT | Real time 5-decade counter | Philips |
| 667953 | HEF4538B | Dual precision monostable multivibrator | Philips |
| 667954 | HEF4538BD | Dual precision monostable multivibrator | Philips |
| 667955 | HEF4538BDB | Dual precision monostable multivibrator | Philips |
| 667956 | HEF4538BF | Dual precision monostable multivibrator | Philips |
| 667957 | HEF4538BN | Dual precision monostable multivibrator | Philips |
| 667958 | HEF4538BP | Dual precision monostable multivibrator | NXP Semiconductors |
| 667959 | HEF4538BP | Dual precision monostable multivibrator | Philips |
| 667960 | HEF4538BPB | Dual precision monostable multivibrator | Philips |
