CIP-51 8051 Core 8-bit Microcontrollers - MCU

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Qty. RoHS ECAD Model Core
Program Memory Size
Data RAM Size
Package/Case
Maximum Clock Frequency
ADC Resolution
Number of I/Os
Supply Voltage - Min
Supply Voltage - Max
Mounting Style
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Minimum Operating Temperature
Maximum Operating Temperature
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Silicon Labs 8-bit Microcontrollers - MCU 8051 50 MHz 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU
Datasheet
1In Stock
Min.: 1
Mult.: 1

CIP-51 8051 16 kB 2.3 kB QFN-28 50 MHz 12 bit 22 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB2 Tube
Silicon Labs 8-bit Microcontrollers - MCU 8051 50 MHz 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU
Datasheet
1.498Expected 8/28/2026
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 16 kB 2.25 kB QFN-20 50 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB2 AEC-Q100 Reel, Cut Tape
Silicon Labs 8-bit Microcontrollers - MCU 8051 50 MHz 64 kB flash 4.25 kB RAM 8-bit Busy Bee MCU
Datasheet
2.430Expected 9/4/2026
Min.: 1
Mult.: 1
: 2.500

CIP-51 8051 64 kB 4.35 kB QFN-32 50 MHz 10 bit, 12 bit 29 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C Reel, Cut Tape

Silicon Labs 8-bit Microcontrollers - MCU 8051 75 MHz 32 kB flash 2.25 kB RAM 8-bit Laser Bee MCU
Datasheet
1.043Expected 10/16/2026
Min.: 1
Mult.: 1

CIP-51 8051 32 kB 2.25 kB QFP-32 72 MHz 10 bit/12 bit/14 bit 28 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 105 C EFM8LB1 Tray

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU
Datasheet
Lead-Time 12 Weeks
Min.: 1
Mult.: 1

CIP-51 8051 8 kB 512 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8BB1 Tube
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 2.500
Mult.: 2.500
: 2.500

CIP-51 8051 8 kB 512 B SOIC-16 25 MHz 12 bit 13 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 Reel

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 4 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 4 kB 512 B QFN-20 25 MHz 12 bit 16 I/O 1.8 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C Reel

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 16 kB 4.25 kB 25 MHz 10 bit 16 I/O 1.8 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8SB Reel

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1
Mult.: 1

CIP-51 8051 32 kB 4.25 kB QFN-24 25 MHz 10 bit 16 I/O 1.8 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8SB Tube
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1
Mult.: 1

CIP-51 8051 2 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 AEC-Q100 Tube
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 2 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 AEC-Q100 Reel, Cut Tape

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 2 kB flash 0.25 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 2 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 Reel, Cut Tape
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 8 kB 512 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 AEC-Q100 Reel

Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 8 kB 512 B QFN-20 25 MHz 12 bit 16 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB1 Reel, Cut Tape
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU
Datasheet
Non-Stocked Lead-Time 12 Weeks
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 8 kB 512 B QFN-24 25 MHz 12 bit 17 I/O 1.8 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8SB AEC-Q100 Reel

Silicon Labs 8-bit Microcontrollers - MCU 8051 50 MHz 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU
Datasheet
Non-Stocked Lead-Time 31 Weeks
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 16 kB 2.3 kB QFN-28 50 MHz 12 bit 22 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 125 C EFM8BB2 Reel

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 1.911
Mult.: 1.911

CIP-51 8051 16 kB 2.25 kB QFN-24 50 MHz 12 bit 17 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8UB Tube

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 1.500
Mult.: 1.500
: 1.500

CIP-51 8051 16 kB 2.25 kB QFN-24 50 MHz 12 bit 17 I/O 2.2 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C EFM8UB Reel
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU
Datasheet
Non-Stocked Lead-Time 25 Weeks
Min.: 1.911
Mult.: 1.911

CIP-51 8051 16 kB 1.28 kB QFN-24 25 MHz 10 bit 21 I/O 2.7 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C C8051F317 Tube
Silicon Labs 8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU
Datasheet
Non-Stocked Lead-Time 25 Weeks
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 16 kB 1.28 kB QFN-24 25 MHz 10 bit 21 I/O 2.7 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C C8051F317 Reel, Cut Tape
Silicon Labs 8-bit Microcontrollers - MCU USB-Flash-16k-ADC-QFN28 OTP available (T321-GM)
Datasheet
Non-Stocked Lead-Time 24 Weeks
Min.: 1
Mult.: 1
: 1.500

CIP-51 8051 16 kB 2.3 kB QFN-28 25 MHz 10 bit 21 I/O 2.7 V 3.6 V SMD/SMT 8 bit - 40 C + 85 C C8051F321 Reel, Cut Tape

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 1
Mult.: 1

CIP-51 8051 4 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2 V 5.25 V SMD/SMT 8 bit - 40 C + 125 C C8051F533 AEC-Q100

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 2.500
Mult.: 1

CIP-51 8051 4 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2 V 5.25 V SMD/SMT 8 bit - 40 C + 125 C C8051F533 AEC-Q100

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 1
Mult.: 1

CIP-51 8051 4 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2 V 5.25 V SMD/SMT 8 bit - 40 C + 125 C C8051F534 AEC-Q100

Silicon Labs 8-bit Microcontrollers - MCU
Datasheet
Non-Stocked
Min.: 2.500
Mult.: 1

CIP-51 8051 4 kB 256 B QFN-20 25 MHz 12 bit 16 I/O 2 V 5.25 V SMD/SMT 8 bit - 40 C + 125 C C8051F534 AEC-Q100