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 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8G-C-TSSOP20
Silicon Labs
1: $1.22
297In Stock

Mfr. Part #
EFM8BB51F8G-C-TSSOP20

Mouser Part #
634-EFM851F8GCTSOP20

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

297In Stock

$1.22

$1.05

$0.925

$0.918

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 29 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-QFN32
Silicon Labs
1: $1.09
2,597In Stock

Mfr. Part #
EFM8BB52F16G-C-QFN32

Mouser Part #
634-EFM852F16GCQFN32

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

2,597In Stock

$1.09

$0.927

$0.863

$0.729

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

QFN-32

12 bit

29I/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-TSSOP20
Silicon Labs
1: $1.27
410In Stock

Mfr. Part #
EFM8BB52F16G-C-TSSOP20

Mouser Part #
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

$1.27

$1.08

$0.952

$0.95

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 8 kB flash 1.28 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB51F8G-C-QFN20
Silicon Labs
1: $2.37
294In Stock

Mfr. Part #
EFM8BB51F8G-C-QFN20

Mouser Part #
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

$2.37

$1.22

$1.21

$0.825

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: $4.20
476In Stock
2,520Expected 2026-03-27

Mfr. Part #
EFM8BB21F16A-C-QFN20

Mouser Part #
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

476In Stock

2,520Expected 2026-03-27

$4.20

$3.52

$3.27

$3.22

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: $5.18
475In Stock

Mfr. Part #
EFM8BB31F32I-D-4QFN24

Mouser Part #
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

$5.18

$3.41

$3.15

$2.74

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 4 kB flash 0.5 kB RAM 8-bit Busy Bee MCU

EFM8BB10F4A-A-QFN20
Silicon Labs
1: $3.84
120In Stock

Mfr. Part #
EFM8BB10F4A-A-QFN20

Mouser Part #
634-FM8BB10F4AAQFN20

Silicon Labs

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

Learn More

Datasheet

120In Stock

$3.84

$3.22

$2.99

$2.64

View

Min.: 1
Mult.: 1

CIP-51 8051

4 kB

512 B

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 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU

EFM8BB10F8A-A-QFN20
Silicon Labs
1: $5.49
20In Stock

Mfr. Part #
EFM8BB10F8A-A-QFN20

Mouser Part #
634-FM8BB10F8AAQFN20

Silicon Labs

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

Learn More

Datasheet

20In Stock

$5.49

$3.61

$2.96

$2.68

View

Min.: 1
Mult.: 1

CIP-51 8051

8 kB

512 B

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 4 kB flash 0.5 kB RAM 8-bit Busy Bee MCU

EFM8BB10F4I-A-QFN20
Silicon Labs
1: $3.30
244In Stock

Mfr. Part #
EFM8BB10F4I-A-QFN20

Mouser Part #
634-M8BB10F4IAQFN20

Silicon Labs

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

Learn More

Datasheet

244In Stock

$3.30

$2.11

$1.89

$1.55

View

Min.: 1
Mult.: 1

CIP-51 8051

4 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: $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 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Busy Bee MCU

EFM8BB10F8I-A-SOIC16R
Silicon Labs
2,500: $0.986
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB10F8I-A-SOIC16R

Mouser Part #
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

$0.986

$0.952

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

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

EFM8BB31F16A-D-4QFN24R
Silicon Labs
1,500: $2.62
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16A-D-4QFN24R

Mouser Part #
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 12 Weeks

Reel

$2.62

$2.59

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

Reel: 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: $2.62
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16A-D-4QFN24

Mouser Part #
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 12 Weeks

$2.62

$2.59

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: $2.90
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16A-D-5QFN32R

Mouser Part #
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 12 Weeks

Reel

$2.90

$2.87

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

Reel: 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: $2.96
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16A-D-5QFN32

Mouser Part #
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 12 Weeks

$2.96

$2.90

$2.87

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

EFM8BB31F16G-D-QFP32R
Silicon Labs
1: $4.94
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16G-D-QFP32R

Mouser Part #
634-EF8BB31F16GDP32R

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 12 Weeks

Cut Tape

$4.94

$3.22

$2.96

$2.54

Reel

$2.08

View

Min.: 1
Mult.: 1

Reel: 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

+ 85 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-4QFN24R
Silicon Labs
1,500: $1.48
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-4QFN24R

Mouser Part #
634-EF8BB31F16ID424R

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 12 Weeks

Reel

$1.48

$1.46

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

Reel: 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

EFM8BB31F16I-D-4QFN24
Silicon Labs
1,911: $1.48
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-4QFN24

Mouser Part #
634-EF8BB31F16ID4F24

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 12 Weeks

$1.48

$1.46

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

EFM8BB31F16I-D-5QFN32R
Silicon Labs
1: $4.62
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-5QFN32R

Mouser Part #
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 12 Weeks

Cut Tape

$4.62

$3.01

$2.76

$2.37

View

Reel

$1.55

Min.: 1
Mult.: 1

Reel: 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: $4.62
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-5QFN32

Mouser Part #
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 12 Weeks

$4.62

$3.01

$2.76

$2.37

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-QFN24R
Silicon Labs
1: $4.43
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-QFN24R

Mouser Part #
634-EF8BB31F16IDF24R

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 12 Weeks

Cut Tape

$4.43

$2.88

$2.62

$2.20

Reel

$1.46

View

Min.: 1
Mult.: 1

Reel: 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, Cut Tape

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

EFM8BB31F16I-D-QFN32R
Silicon Labs
2,500: $1.46
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-QFN32R

Mouser Part #
634-EF8BB31F16IDN32R

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 12 Weeks

Reel

$1.46

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

Reel: 2,500

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

EFM8BB31F16I-D-QFP32R
Silicon Labs
1: $5.24
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-QFP32R

Mouser Part #
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

Non-Stocked Lead-Time 12 Weeks

Cut Tape

$5.24

$3.46

$3.19

$2.77

Reel

$2.25

View

Min.: 1
Mult.: 1

Reel: 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 16 kB flash 2.25 kB RAM 8-bit Busy Bee MCU

EFM8BB31F16I-D-QFN24
Silicon Labs
2,520: $1.40
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFM8BB31F16I-D-QFN24

Mouser Part #
634-EF8BB31F16IDQF24

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 12 Weeks

$1.40

$1.39

Min.: 2,520
Mult.: 2,520

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

EFM8BB Busy Bee 8-Bit Microcontrollers

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