| 668001 | HEF4555BDB | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668002 | HEF4555BF | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668003 | HEF4555BN | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668004 | HEF4555BP | 1-of-4 decoder/demultiplexer | NXP Semiconductors |
| 668005 | HEF4555BP | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668006 | HEF4555BPB | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668007 | HEF4555BT | 1-of-4 decoder/demultiplexer | Nexperia |
| 668008 | HEF4555BT | 1-of-4 decoder/demultiplexer | NXP Semiconductors |
| 668009 | HEF4555BT | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668010 | HEF4555BT-Q100 | 1-of-4 decoder/demultiplexer | Nexperia |
| 668011 | HEF4555BT-Q100 | 1-of-4 decoder/demultiplexer | NXP Semiconductors |
| 668012 | HEF4556B | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668013 | HEF4556BD | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668014 | HEF4556BDB | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668015 | HEF4556BF | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668016 | HEF4556BN | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668017 | HEF4556BP | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668018 | HEF4556BPB | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668019 | HEF4556BT | Dual 1-of-4 decoder/demultiplexer | Philips |
|
| 668020 | HEF4556BU | Dual 1-of-4 decoder/demultiplexer | Philips |
| 668021 | HEF4557B | 1-to-64 bit variable length shift register | Philips |
| 668022 | HEF4557BD | 1-to-64 bit variable length shift register | Philips |
| 668023 | HEF4557BDB | 1-to-64 bit variable length shift register | Philips |
| 668024 | HEF4557BF | 1-to-64 bit variable length shift register | Philips |
| 668025 | HEF4557BN | 1-to-64 bit variable length shift register | Philips |
| 668026 | HEF4557BP | 1-to-64 bit variable length shift register | NXP Semiconductors |
| 668027 | HEF4557BP | 1-to-64 bit variable length shift register | Philips |
| 668028 | HEF4557BPB | 1-to-64 bit variable length shift register | Philips |
| 668029 | HEF4557BT | 1-to-64 bit variable length shift register | Nexperia |
| 668030 | HEF4557BT | 1-to-64 bit variable length shift register | NXP Semiconductors |
| 668031 | HEF4557BT | 1-to-64 bit variable length shift register | Philips |
| 668032 | HEF4557BU | 1-to-64 bit variable length shift register | Philips |
| 668033 | HEF4585B | 4-bit magnitude comparator | Philips |
| 668034 | HEF4585BD | 4-bit magnitude comparator | Philips |
| 668035 | HEF4585BDB | 4-bit magnitude comparator | Philips |
| 668036 | HEF4585BF | 4-bit magnitude comparator | Philips |
| 668037 | HEF4585BN | 4-bit magnitude comparator | Philips |
| 668038 | HEF4585BP | 4-bit magnitude comparator | Philips |
| 668039 | HEF4585BPB | 4-bit magnitude comparator | Philips |
| 668040 | HEF4585BT | 4-bit magnitude comparator | Philips |
