| PartNumber | AT93C66B-MAHM-T | AT93C66B-MAHM-E | AT93C66B-SSHM-B |
| Description | EEPROM 4K (512x8/256x16) 3-WIRE NiPdAu, 1.7V | EEPROM 1.7-5.5V, 2MHz, Ind Tmp, 8-UDFN | EEPROM 4K (512x8/256x16) 3-WIRE, NiPdAu, 1.7V |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | EEPROM | EEPROM | EEPROM |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | UDFN-8 | UDFN-8 | SOIC-8 |
| Memory Size | 4 kbit | 4 kbit | 4 kbit |
| Organization | 512 x 8, 256 x 16 | 512 x 8, 256 x 16 | 512 x 8, 256 x 16 |
| Interface Type | Serial, 3-Wire, Microwire | Serial, 3-Wire, Microwire | Serial, 3-Wire, Microwire |
| Data Retention | 100 Year | 100 Year | 100 Year |
| Maximum Clock Frequency | 2 MHz | 2 MHz | 2 MHz |
| Supply Current Max | 2 mA | 2 mA | 2 mA |
| Supply Voltage Min | 1.7 V | 1.7 V | 1.7 V |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Series | AT93C66B | AT93C66B | AT93C66B |
| Packaging | Reel | Reel | Tube |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Operating Supply Voltage | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Product Type | EEPROM | EEPROM | EEPROM |
| Factory Pack Quantity | 5000 | 15000 | 100 |
| Subcategory | Memory & Data Storage | Memory & Data Storage | Memory & Data Storage |
| Unit Weight | 0.000335 oz | - | 0.019048 oz |
| Operating Supply Current | - | - | 0.5 mA |