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| PartNumber | EFM8UB20F64G-A-QFP32R | EFM8UB20F64G-A-QFP32 | EFM8UB20F64G-A-QFP48 |
| Description | 8-bit Microcontrollers - MCU USB, 64kB/4352B RAM, 10b Diff-ADC | 8-bit Microcontrollers - MCU USB, 64kB/4352B RAM, 10b Diff-ADC | 8-bit Microcontrollers - MCU USB, 64kB/4352B RAM, 10b Diff-ADC, EMIF |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Laboratories |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | QFP-32 | QFP-32 | QFP-48 |
| Series | EFM8UB2 | EFM8UB2 | EFM8UB2 |
| Packaging | Reel | Tray | Tray |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 500 | 250 | 250 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Tradename | EFM8 | EFM8 | EFM8 |
| Unit Weight | 0.005742 oz | 0.005742 oz | 0.105822 oz |
| Core | - | 8051 | 8051 |
| Data Bus Width | - | 8 bit | 8 bit |
| Maximum Clock Frequency | - | 48 MHz | 48 MHz |
| Program Memory Size | - | 64 kB | 64 kB |
| Data RAM Size | - | 4 kB | 4 kB |
| ADC Resolution | - | 10 bit | 10 bit |
| Number of I/Os | - | 25 I/O | 40 I/O |
| Operating Supply Voltage | - | 3.3 V | 3.3 V |
| Minimum Operating Temperature | - | - 40 C | - 40 C |
| Maximum Operating Temperature | - | + 85 C | + 85 C |
| Product | - | MCU | MCU |
| Program Memory Type | - | Flash | Flash |
| Data RAM Type | - | RAM | RAM |
| Interface Type | - | I2C, SMBus, SPI, UART | I2C, SMBus, SPI, UART |
| Moisture Sensitive | - | Yes | Yes |
| Number of ADC Channels | - | 20 Channel | 32 Channel |
| Number of Timers/Counters | - | 6 Timer | 6 Timer |
| Processor Series | - | EFM8UB2 | EFM8UB2 |
| Supply Voltage Max | - | 3.6 V | 3.6 V |
| Supply Voltage Min | - | 2.7 V | 2.7 V |