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| PartNumber | GS8640Z18GT-250I | GS8640Z18GT-250 | GS8640Z18GT-250IV |
| Description | SRAM 2.5 or 3.3V 4M x 18 72M | SRAM 2.5 or 3.3V 4M x 18 72M | SRAM 1.8/2.5V 4M x 18 72M |
| Manufacturer | GSI Technology | GSI Technology | GSI Technology |
| Product Category | SRAM | SRAM | SRAM |
| RoHS | Y | Y | Y |
| Memory Size | 72 Mbit | 72 Mbit | 72 Mbit |
| Organization | 4 M x 18 | 4 M x 18 | 4 M x 18 |
| Access Time | 6.5 ns | 6.5 ns | 6.5 ns |
| Maximum Clock Frequency | 250 MHz | 250 MHz | 250 MHz |
| Interface Type | Parallel | Parallel | Parallel |
| Supply Voltage Max | 3.6 V | 3.6 V | 2.7 V |
| Supply Voltage Min | 2.3 V | 2.3 V | 1.7 V |
| Supply Current Max | 250 mA, 335 mA | 230 mA, 315 mA | 250 mA, 335 mA |
| Minimum Operating Temperature | - 40 C | 0 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 70 C | + 85 C |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | TQFP-100 | TQFP-100 | TQFP-100 |
| Packaging | Tray | Tray | Tray |
| Memory Type | SDR | SDR | SDR |
| Series | GS8640Z18GT | GS8640Z18GT | GS8640Z18GT |
| Type | NBT Pipeline/Flow Through | NBT Pipeline/Flow Through | NBT Pipeline/Flow Through |
| Brand | GSI Technology | GSI Technology | GSI Technology |
| Moisture Sensitive | Yes | Yes | Yes |
| Product Type | SRAM | SRAM | SRAM |
| Factory Pack Quantity | 18 | 18 | 18 |
| Subcategory | Memory & Data Storage | Memory & Data Storage | Memory & Data Storage |
| Tradename | NBT SRAM | NBT SRAM | NBT SRAM |