| Nr. | Part Name | Description | Manufacturer by |
| 678521 | M27C256B-90B1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678522 | M27C256B-90B3 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678523 | M27C256B-90B3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678524 | M27C256B-90B3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678525 | M27C256B-90B6 | 256 KBIT (32KB X8) UV EPROM AND OTP EPROM | ST Microelectronics |
| 678526 | M27C256B-90B6 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678527 | M27C256B-90B6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678528 | M27C256B-90B6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678529 | M27C256B-90B7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678530 | M27C256B-90B7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678531 | M27C256B-90C1 | 256 KBIT (32KB X8) UV EPROM AND OTP EPROM | ST Microelectronics |
| 678532 | M27C256B-90C1 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678533 | M27C256B-90C1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678534 | M27C256B-90C1TR | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678535 | M27C256B-90C1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678536 | M27C256B-90C3 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678537 | M27C256B-90C3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678538 | M27C256B-90C3TR | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678539 | M27C256B-90C3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678540 | M27C256B-90C6 | 256 KBIT (32KB X8) UV EPROM AND OTP EPROM | ST Microelectronics |
| 678541 | M27C256B-90C6 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678542 | M27C256B-90C6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678543 | M27C256B-90C6TR | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678544 | M27C256B-90C6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678545 | M27C256B-90C7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678546 | M27C256B-90C7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678547 | M27C256B-90F1 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678548 | M27C256B-90F1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678549 | M27C256B-90F1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678550 | M27C256B-90F3 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678551 | M27C256B-90F3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678552 | M27C256B-90F3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678553 | M27C256B-90F6 | 256 KBIT (32KB X8) UV EPROM AND OTP EPROM | ST Microelectronics |
| 678554 | M27C256B-90F6 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678555 | M27C256B-90F6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678556 | M27C256B-90F6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678557 | M27C256B-90F7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678558 | M27C256B-90F7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678559 | M27C256B-90N1 | 256 Kbit (32Kb x 8) EPROM, 5V, 90ns | SGS Thomson Microelectronics |
| 678560 | M27C256B-90N1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
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