| PartNumber | 1338C-18SRI | 1338C-18SRI8 | 1338C-31SRI |
| Description | Real Time Clock Real Time Clock with Embedded Crystal | Real Time Clock Real Time Clock with Embedded Crystal | Real Time Clock Real Time Clock with Embedded Crystal |
| Manufacturer | IDT (Integrated Device Technology) | IDT (Integrated Device Technology) | IDT (Integrated Device Technology) |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | Y | Y |
| Package / Case | SOIC-16 | SOIC-16 | SOIC-16 |
| Battery Backup Switching | Backup Switching | Backup Switching | Backup Switching |
| Packaging | Tube | Reel | Tube |
| Height | 2.34 mm | 2.34 mm | 2.34 mm |
| Length | 10.4 mm | 10.4 mm | 10.4 mm |
| Series | 1338 | 1338 | 1338 |
| Width | 7.6 mm | 7.6 mm | 7.6 mm |
| Brand | IDT | IDT | IDT |
| Moisture Sensitive | Yes | Yes | Yes |
| Product Type | Real Time Clocks | Real Time Clocks | Real Time Clocks |
| Factory Pack Quantity | 46 | 1000 | 46 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | 1338 IDT1338C-18SRI | 1338 IDT1338C-18SRI8 | 1338 IDT1338C-31SRI |
| Unit Weight | 0.023492 oz | 0.023492 oz | 0.023492 oz |