| PartNumber | FM27C256Q150 | FM27C256QE150 | FM27C256Q120 |
| Description | EPROM | EPROM DIP-28 | EPROM DIP-28 |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | EPROM | EPROM | EPROM |
| RoHS | N | N | N |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | CDIP-28 | CDIP-28 | CDIP-28 |
| Memory Size | 256 kbit | 256 kbit | 256 kbit |
| Organization | 32 k x 8 | 32 k x 8 | 32 k x 8 |
| Interface Type | Parallel | Parallel | Parallel |
| Operating Supply Current | 35 mA | 35 mA | 35 mA |
| Programming Voltage | 12.75 V | 12.75 V | 12.75 V |
| Supply Voltage Min | 4.5 V | 4.5 V | 4.5 V |
| Minimum Operating Temperature | 0 C | 0 C | 0 C |
| Maximum Operating Temperature | + 70 C | + 85 C | + 70 C |
| Access Time | 150 ns | 150 ns | 120 ns |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Operating Supply Voltage | 5 V | 5 V | 5 V |
| Output Enable Access Time | 50 ns | 50 ns | 50 ns |
| Product Type | EPROM | EPROM | EPROM |
| Subcategory | Memory & Data Storage | Memory & Data Storage | Memory & Data Storage |