| Part name | Description | Manufacturer | Package | Pins | Temp. Range | PDF datasheet |
| M27C4001-55XC1TR | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | PLCC | 32 | 0°C | 70°C | M27C4001-55XC1TR datasheet (113K) |
| M27C4001-55XC1X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | PLCC | 32 | 0°C | 70°C | M27C4001-55XC1X datasheet (113K) |
| M27C4001-55XC6X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | PLCC | 32 | -40°C | 85°C | M27C4001-55XC6X datasheet (113K) |
| M27C4001-55XF1X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | FDIP | 32 | 0°C | 70°C | M27C4001-55XF1X datasheet (113K) |
| M27C4001-55XF6X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | FDIP | 32 | -40°C | 85°C | M27C4001-55XF6X datasheet (113K) |
| M27C4001-55XL1TR | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | LCCC | 32 | 0°C | 70°C | M27C4001-55XL1TR datasheet (113K) |
| M27C4001-55XL6TR | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | LCCC | 32 | -40°C | 85°C | M27C4001-55XL6TR datasheet (113K) |
| M27C4001-55XN1TR | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | TSOP | 32 | 0°C | 70°C | M27C4001-55XN1TR datasheet (113K) |
| M27C4001-55XN1X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | TSOP | 32 | 0°C | 70°C | M27C4001-55XN1X datasheet (113K) |
| M27C4001-55XN1X | 4 Mbit (512Kb x 8) EPROM, 55ns | SGS-Thomson Microelectronics | TSOP | 32 | 0°C | 70°C | M27C4001-55XN1X datasheet (113K) |
