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| PartNumber | P87C661X2FA/529 | P87C661X2BBD/157 | P87C661X2BBD |
| Description | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU 16K/512B OTP 12/6 CLK I2CX2 |
| Manufacturer | NXP | NXP | PHILIPS |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | IC Chips |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | PLCC-44 | LQFP-44 | - |
| Core | 80C51 | 80C51 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Height | 3.69 mm (Min) | 1.4 mm | - |
| Length | 16.66 mm (Max) | 10 mm | - |
| Width | 16.66 mm (Max) | 10 mm | - |
| Brand | NXP Semiconductors | NXP Semiconductors | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Unit Weight | 0.084185 oz | 0.012561 oz | - |