8-bit Microcontrollers - MCU

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EFM8 8-Bit Microcontrollers (MCUs)

Silicon Labs EFM8 Family offers a wide range of performances. They feature fast processors that allow for complex algorithm implementation and ultra-low power architectures with flexible sleep modes. All EFM8 devices have highly efficient peripherals, low-power consumption, BOM integration, and exquisite analog. The highly flexible digital and analog multiplexing strategy means that you can route nearly every I/O pin "wisely" to simplify PCB routing. Designers can choose peripherals and pinout placement without worrying about pre-set limitations and pin conflicts. The Silicon Labs EFM8 MCUs come with a comprehensive IDE, including sample code and energy-aware monitoring tools. Simplicity Studio platform is your one-stop solution for accessing demos, software examples, datasheets, technical support, and forums.

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Part #

8-bit Microcontrollers - MCU 8051 25 MHz 4 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU

EFM8SB10F4G-A-QFN20
Silicon Labs
1: $3.66
28In Stock

Mfr. Part #
EFM8SB10F4G-A-QFN20

Mouser Part #
634-8SB10F4GAQF20

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 4 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

28In Stock

$3.66

$2.36

$2.11

$1.60

View

Min.: 1
Mult.: 1

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

Tube

8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU

EFM8SB10F8G-A-QSOP24
Silicon Labs
1: $2.53
152In Stock
End of Life

Mfr. Part #
EFM8SB10F8G-A-QSOP24

Mouser Part #
634-8SB10F8GAQS24

End of Life

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

152In Stock

$2.53

$2.14

$1.86

$1.75

View

Min.: 1
Mult.: 1

CIP-51 8051

8 kB

512 B

QSOP-24

25 MHz

12 bit

17 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

Tube

8-bit Microcontrollers - MCU 8051 50 MHz 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

EFM8BB22F16I-C-QFN28
Silicon Labs
1: $4.94
1In Stock

Mfr. Part #
EFM8BB22F16I-C-QFN28

Mouser Part #
634-8BB22F16ICQFN28

Silicon Labs

8-bit Microcontrollers - MCU 8051 50 MHz 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

1In Stock

$4.94

$3.22

$2.96

$2.54

View

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

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-QFN20
Silicon Labs
1: $1.22
200Expected 2026-02-27

Mfr. Part #
EFM8BB52F16G-C-QFN20

Mouser Part #
634-EFM852F16GCQFN20

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

200Expected 2026-02-27

$1.22

$1.04

$0.973

$0.86

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

QFN-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F16I-C-TSSOP20R
Silicon Labs
2,500: $0.775
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F16I-C-TSSOP20R

Mouser Part #
634-EFM851F16TSOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$0.775

$0.75

Min.: 2,500
Mult.: 2,500

Reel: 2,500

16 kB

1.28 kB

TSSOP-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8G-C-TSSOP20R
Silicon Labs
2,500: $0.691
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F8G-C-TSSOP20R

Mouser Part #
634-EFM851F8GCTOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$0.691

$0.667

Min.: 2,500
Mult.: 2,500

Reel: 2,500

16 kB

1.28 kB

TSSOP-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8I-C-QFN20R
Silicon Labs
1: $2.31
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F8I-C-QFN20R

Mouser Part #
634-EFM851F8ICQFN20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Cut Tape

$2.31

$1.47

$1.31

$1.08

Reel

$0.67

View

Min.: 1
Mult.: 1

Reel: 2,500

16 kB

1.28 kB

QFN-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel, Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8I-C-TSSOP20R
Silicon Labs
2,500: $0.711
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F8I-C-TSSOP20R

Mouser Part #
634-EFM851F8ICTOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$0.711

$0.687

Min.: 2,500
Mult.: 2,500

Reel: 2,500

16 kB

1.28 kB

TSSOP-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F16G-C-TSSOP20R
Silicon Labs
1: $2.54
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F16G-C-TSSOP20R

Mouser Part #
634-EFM851GCTSSOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Cut Tape

$2.54

$1.63

$1.44

$1.19

Reel

$0.733

View

Min.: 1
Mult.: 1

Reel: 2,500

16 kB

1.28 kB

TSSOP-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel, Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 29 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-QFN32R
Silicon Labs
1: $2.29
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB52F16G-C-QFN32R

Mouser Part #
634-EFM852F16GQFN32R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 29 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Cut Tape

$2.29

$1.44

$1.24

$0.973

Reel

$0.608

View

Min.: 1
Mult.: 1

Reel: 2,500

16 kB

1.28 kB

QFN-32

29 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel, Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-TSSOP20R
Silicon Labs
1: $2.46
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB52F16G-C-TSSOP20R

Mouser Part #
634-EFM852F16GTOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Cut Tape

$2.46

$1.58

$1.40

$1.15

Reel

$0.711

View

Min.: 1
Mult.: 1

Reel: 2,500

16 kB

1.28 kB

TSSOP-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel, Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 25 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-TSSOP28R
Silicon Labs
2,500: $0.775
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB52F16G-C-TSSOP28R

Mouser Part #
634-EFM852F16GTOP28R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 16 kB flash 1.28 kB RAM 25 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$0.775

$0.75

Min.: 2,500
Mult.: 2,500

Reel: 2,500

16 kB

1.28 kB

TSSOP-28

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Reel

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8I-C-QFN20
Silicon Labs
1: $2.31
Non-Stocked Lead-Time 16 Weeks

Mfr. Part #
EFM8BB51F8I-C-QFN20

Mouser Part #
634-EFM8B51F8ICQFN20

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

$2.31

$1.47

$1.31

$0.801

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

QFN-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 85 C

Cut Tape

EFM8 8-Bit Microcontrollers (MCUs)

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