| Nr. | Part Name | Description | Manufacturer by |
| 677801 | M27C256B-12XN6 | 256 Kbit (32Kb x 8) EPROM, 5V, 120ns | SGS Thomson Microelectronics |
| 677802 | M27C256B-12XN6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677803 | M27C256B-12XN6TR | 256 Kbit (32Kb x 8) EPROM, 5V, 120ns | SGS Thomson Microelectronics |
| 677804 | M27C256B-12XN6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677805 | M27C256B-12XN7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677806 | M27C256B-12XN7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677807 | M27C256B-15B1 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677808 | M27C256B-15B1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677809 | M27C256B-15B1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677810 | M27C256B-15B3 | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677811 | M27C256B-15B3 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677812 | M27C256B-15B3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677813 | M27C256B-15B3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677814 | M27C256B-15B6 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677815 | M27C256B-15B6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677816 | M27C256B-15B6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677817 | M27C256B-15B7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677818 | M27C256B-15B7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677819 | M27C256B-15C1 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677820 | M27C256B-15C1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677821 | M27C256B-15C1TR | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677822 | M27C256B-15C1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677823 | M27C256B-15C3 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677824 | M27C256B-15C3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677825 | M27C256B-15C3TR | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677826 | M27C256B-15C3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677827 | M27C256B-15C6 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677828 | M27C256B-15C6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677829 | M27C256B-15C6TR | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677830 | M27C256B-15C6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677831 | M27C256B-15C7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677832 | M27C256B-15C7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677833 | M27C256B-15F1 | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677834 | M27C256B-15F1 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677835 | M27C256B-15F1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677836 | M27C256B-15F1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677837 | M27C256B-15F3 | 256 Kbit (32Kb x 8) EPROM, 5V, 150ns | SGS Thomson Microelectronics |
| 677838 | M27C256B-15F3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677839 | M27C256B-15F3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 677840 | M27C256B-15F6 | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
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