8-bit Microcontrollers - MCU

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EFM8BB Busy Bee 8-Bit Microcontrollers

Silicon Labs EFM8 EFM8BB Busy Bee 8-Bit Microcontrollers provide state-of-the-art performance by integrating 12-bit ADC, internal temperature sensor, and up to two 12-bit DACs into small packages. Using an efficient, pipelined 8051 core with maximum operating frequency at 50MHz, various communication interfaces, and four channels of configurable logic, the Silicon Labs EFM8BB MCUs are well-suited for many embedded and general-purpose applications.

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Part #

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

EFM8BB52F16G-C-TSSOP20
Silicon Labs
1: $1.34
410In Stock

Mfr. Part No.
EFM8BB52F16G-C-TSSOP20

Mouser Part No
634-EFM852F16GCTOP20

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

410In Stock

$1.34

$0.965

$0.865

$0.80

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

TSSOP-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

EFM8BB52F16G-C-QFN20R
Silicon Labs
1: $0.94
2,499In Stock

Mfr. Part No.
EFM8BB52F16G-C-QFN20R

Mouser Part No
634-EFM852F16GQFN20R

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

2,499In Stock

Cut Tape

$0.94

$0.809

$0.753

$0.672

View

Reel

$0.437

Min.: 1
Mult.: 1

: 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

EFM8BB51F8G-C-QFN20
Silicon Labs
1: $1.60
294In Stock

Mfr. Part No.
EFM8BB51F8G-C-QFN20

Mouser Part No
634-EFM8B51F8GCQFN20

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

294In Stock

$1.60

$1.02

$0.723

$0.60

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

EFM8BB21F16A-C-QFN20
Silicon Labs
1: $4.10
82In Stock
2,520Expected 04/09/2026

Mfr. Part No.
EFM8BB21F16A-C-QFN20

Mouser Part No
634-EFM8BB21F16FN20

Silicon Labs

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

Learn More

Datasheet

82In Stock

2,520Expected 04/09/2026

$4.10

$2.96

$2.69

$2.29

View

Min.: 1
Mult.: 1

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

Tube

8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

EFM8BB31F32I-D-4QFN24
Silicon Labs
1: $3.33
475In Stock

Mfr. Part No.
EFM8BB31F32I-D-4QFN24

Mouser Part No
634-EF8BB31F32ID4F24

Silicon Labs

8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

475In Stock

$3.33

$2.19

$2.02

$1.76

View

Min.: 1
Mult.: 1

CIP-51 8051

32 kB

2.3 kB

QFN-24

50 MHz

10 bit, 12 bit

20 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 125 C

Tube

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

EFM8BB10F8G-A-SOIC16R
Silicon Labs
1: $1.23
4,991Expected 15/09/2026

Mfr. Part No.
EFM8BB10F8G-A-SOIC16R

Mouser Part No
634-8BB10F8GASO16R

Silicon Labs

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

Learn More

Datasheet

4,991Expected 15/09/2026

Cut Tape

$1.23

$1.03

$0.945

$0.829

View

Reel

$0.548

MouseReel Available

Min.: 1
Mult.: 1

: 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

+ 85 C

EFM8BB1

Reel, Cut Tape, MouseReel

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

EFM8BB10F8I-A-QFN20
Silicon Labs
1: $1.22
2,520Expected 04/09/2026

Mfr. Part No.
EFM8BB10F8I-A-QFN20

Mouser Part No
634-FM8BB10F8IAQFN20

Silicon Labs

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

Learn More

Datasheet

2,520Expected 04/09/2026

$1.22

$1.04

$0.96

$0.845

View

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

+ 125 C

EFM8BB1

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: $3.18
1In Stock

Mfr. Part No.
EFM8BB22F16I-C-QFN28

Mouser Part No
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

$3.18

$2.07

$1.90

$1.63

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

EFM8BB21F16A-C-QFN20R
Silicon Labs
1: $4.46
1,498Expected 28/08/2026

Mfr. Part No.
EFM8BB21F16A-C-QFN20R

Mouser Part No
634-BB21F16ACQFN20R

Silicon Labs

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

Learn More

Datasheet

1,498Expected 28/08/2026

Cut Tape

$4.46

$2.95

$2.68

$2.28

View

Reel

$1.90

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

8-bit Microcontrollers - MCU 8051 50 MHz 64 kB flash 4.25 kB RAM 8-bit Busy Bee MCU

EFM8BB31F64I-D-QFN32R
Silicon Labs
1: $4.11
2,430Expected 04/09/2026

Mfr. Part No.
EFM8BB31F64I-D-QFN32R

Mouser Part No
634-EF8BB31F64IDN32R

Silicon Labs

8-bit Microcontrollers - MCU 8051 50 MHz 64 kB flash 4.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

2,430Expected 04/09/2026

Cut Tape

$4.11

$2.72

$2.48

$2.10

View

Reel

$1.58

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

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

EFM8BB10F8I-A-SOIC16R
Silicon Labs
2,500: $0.687
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F8I-A-SOIC16R

Mouser Part No
634-8BB10F8IASOIC16R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$0.687

$0.673

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

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU

EFM8BB10F2A-A-QFN20
Silicon Labs
1: $2.25
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F2A-A-QFN20

Mouser Part No
634-FM8BB10F2AAQFN20

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$2.25

$1.90

$1.76

$1.55

View

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

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU

EFM8BB10F2A-A-QFN20R
Silicon Labs
1: $3.49
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F2A-A-QFN20R

Mouser Part No
634-M8BB10F2AAQFN20R

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB Flash 0.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

$3.49

$2.30

$2.12

$1.84

View

Reel

$1.28

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

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB flash 0.25 kB RAM 8-bit Busy Bee MCU

EFM8BB10F2I-A-QFN20R
Silicon Labs
1: $1.64
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F2I-A-QFN20R

Mouser Part No
634-M8BB10F2IAQFN20R

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 2 kB flash 0.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

$1.64

$1.05

$0.932

$0.767

Reel

$0.492

View

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

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

EFM8BB10F8A-A-QFN20R
Silicon Labs
1,500: $1.30
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F8A-A-QFN20R

Mouser Part No
634-M8BB10F8AAQFN20R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$1.30

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

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

EFM8BB10F8I-A-QFN20R
Silicon Labs
1: $2.22
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8BB10F8I-A-QFN20R

Mouser Part No
634-M8BB10F8IAQFN20R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

$2.22

$1.42

$1.26

$1.04

Reel

$0.687

View

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

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

EFM8BB22F16I-C-QFN28R
Silicon Labs
1,500: $1.25
Non-Stocked Lead-Time 31 Weeks

Mfr. Part No.
EFM8BB22F16I-C-QFN28R

Mouser Part No
634-8BB22F16ICQFN28R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 31 Weeks

Reel

$1.25

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

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

EFM8BB31F16A-D-4QFN24R
Silicon Labs
1,500: $1.81
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16A-D-4QFN24R

Mouser Part No
634-EF8BB31F16AD424R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$1.81

$1.80

Min.: 1,500
Mult.: 1,500

: 1,500

CIP-51 8051

16 kB

2.3 kB

QFN-24

50 MHz

10 bit, 12 bit

20 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 125 C

Reel

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

EFM8BB31F16A-D-4QFN24
Silicon Labs
1,911: $1.81
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16A-D-4QFN24

Mouser Part No
634-EF8BB31F16AD4F24

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

$1.81

$1.80

Min.: 1,911
Mult.: 1,911

CIP-51 8051

16 kB

2.3 kB

QFN-24

50 MHz

10 bit, 12 bit

20 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 125 C

Tube

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

EFM8BB31F16A-D-5QFN32R
Silicon Labs
1,500: $2.00
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16A-D-5QFN32R

Mouser Part No
634-EF8BB31F16AD532R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$2.00

Min.: 1,500
Mult.: 1,500

: 1,500

CIP-51 8051

16 kB

2.3 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

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

EFM8BB31F16A-D-5QFN32
Silicon Labs
1,533: $2.07
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16A-D-5QFN32

Mouser Part No
634-EF8BB31F16AD5F32

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

$2.07

$2.02

$2.00

Min.: 1,533
Mult.: 1,533

CIP-51 8051

16 kB

2.3 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

Tube

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

EFM8BB31F16I-D-5QFN32R
Silicon Labs
1: $2.97
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16I-D-5QFN32R

Mouser Part No
634-EF8BB31F16ID532R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Cut Tape

$2.97

$1.93

$1.77

$1.52

Reel

$1.07

View

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

16 kB

2.3 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

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

EFM8BB31F16I-D-5QFN32
Silicon Labs
1: $2.97
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16I-D-5QFN32

Mouser Part No
634-EF8BB31F16ID5F32

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

$2.97

$1.93

$1.77

$1.52

View

Min.: 1
Mult.: 1

CIP-51 8051

16 kB

2.3 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

Tube

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

EFM8BB31F16I-D-QFP32R
Silicon Labs
1: $3.38
Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F16I-D-QFP32R

Mouser Part No
634-EF8BB31F16IDP32R

Silicon Labs

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

Learn More

Datasheet

Lead-Time 16 Weeks

Cut Tape

$3.38

$2.23

$2.06

$1.79

Reel

$1.34

View

Min.: 1
Mult.: 1

: 500

CIP-51 8051

16 kB

2.3 kB

QFP-32

50 MHz

10 bit, 12 bit

28 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 125 C

Reel, Cut Tape

8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

EFM8BB31F32A-D-5QFN32R
Silicon Labs
1,500: $2.06
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB31F32A-D-5QFN32R

Mouser Part No
634-EF8BB31F32AD532R

Silicon Labs

8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

Learn More

Datasheet

Non-Stocked Lead-Time 16 Weeks

Reel

$2.06

Min.: 1,500
Mult.: 1,500

: 1,500

CIP-51 8051

32 kB

2.3 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

EFM8BB Busy Bee 8-Bit Microcontrollers

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