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| PartNumber | IS61DDB21M18A-300M3L | IS61DDB21M18A-300B4L | IS61DDB21M18A-300B4LI |
| Description | SRAM 18Mb 300Mhz 1Mx18 DDR-II Sync SRAM | SRAM 18Mb, 1M x 18 DDR-II Sync SRAM | SRAM Chip Sync 1.8V 18M-bit 1M x 18 165-Pin FBGA - Bulk (Alt: IS61DDB21M18A-300B4LI) |
| Manufacturer | ISSI | ISSI | - |
| Product Category | SRAM | SRAM | - |
| RoHS | Y | Y | - |
| Memory Size | 18 Mbit | 18 Mbit | - |
| Organization | 1 M x 18 | 1 M x 18 | - |
| Maximum Clock Frequency | 300 MHz | 300 MHz | - |
| Interface Type | Parallel | Parallel | - |
| Supply Voltage Max | 1.9 V | 1.89 V | - |
| Supply Voltage Min | 1.7 V | 1.71 V | - |
| Supply Current Max | 600 mA | 580 mA | - |
| Minimum Operating Temperature | 0 C | 0 C | - |
| Maximum Operating Temperature | + 70 C | + 70 C | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | FBGA-165 | FBGA-165 | - |
| Packaging | Tray | Tray | - |
| Memory Type | DDR-II | DDR | - |
| Series | IS61DDB21M18A | IS61DDB21M18A | - |
| Brand | ISSI | ISSI | - |
| Moisture Sensitive | Yes | Yes | - |
| Product Type | SRAM | SRAM | - |
| Factory Pack Quantity | 105 | 144 | - |
| Subcategory | Memory & Data Storage | Memory & Data Storage | - |
| Access Time | - | 0.45 ns | - |
| Type | - | Synchronous | - |