8-bit Microcontrollers - MCU

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EFM8BB51 & EFM8BB52 Busy Bee 8-bit MCUs

Silicon Labs EFM8BB51 and EFM8BB52 Busy Bee MCUs are multi-purpose microcontrollers with a comprehensive feature set in compact packages. These devices offer high value by integrating advanced analogue and communication peripherals into a small footprint, making them ideal for space-constrained applications. With an efficient 8051 core, 5V capable I/O, precision analogue and enhanced pulse-width modulation, the EFM8BB51 and EFM8BB52 MCUs are optimal for embedded applications.

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Part #

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

EFM8BB52F16I-C-QFN32R
Silicon Labs
1: 12,91 kr.
2.500Expected 05/11/2026

Mfr. Part No.
EFM8BB52F16I-C-QFN32R

Mouser Part No
634-EFM852F16IQFN32R

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

2.500Expected 05/11/2026

Cut Tape

12,91 kr.

7,91 kr.

5,02 kr.

4,34 kr.

Reel

2,69 kr.

View

Min.: 1
Mult.: 1

: 2.500

16 kB

1.28 kB

QFN-32

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 16 GPIO BB5 8-bit MCU

EFM8BB51F16I-C-TSSOP20R
Silicon Labs
2.500: 3,21 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F16I-C-TSSOP20R

Mouser Part No
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 24 Weeks

Reel

3,21 kr.

3,15 kr.

3,10 kr.

Min.: 2.500
Mult.: 2.500

: 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: 2,86 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F8G-C-TSSOP20R

Mouser Part No
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 24 Weeks

Reel

2,86 kr.

2,80 kr.

2,76 kr.

Min.: 2.500
Mult.: 2.500

: 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: 9,55 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F8I-C-QFN20R

Mouser Part No
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 24 Weeks

Cut Tape

9,55 kr.

6,09 kr.

4,47 kr.

3,90 kr.

Reel

2,78 kr.

View

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

EFM8BB51F8I-C-TSSOP20R
Silicon Labs
2.500: 2,95 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F8I-C-TSSOP20R

Mouser Part No
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 24 Weeks

Reel

2,95 kr.

2,89 kr.

2,84 kr.

Min.: 2.500
Mult.: 2.500

: 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: 10,52 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F16G-C-TSSOP20R

Mouser Part No
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 24 Weeks

Cut Tape

10,52 kr.

6,74 kr.

4,92 kr.

4,29 kr.

Reel

3,04 kr.

View

Min.: 1
Mult.: 1

: 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: 12,09 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16G-C-QFN32R

Mouser Part No
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 24 Weeks

Cut Tape

12,09 kr.

7,38 kr.

4,67 kr.

4,04 kr.

Reel

2,51 kr.

View

Min.: 1
Mult.: 1

: 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
2.500: 2,95 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16G-C-TSSOP20R

Mouser Part No
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 24 Weeks

Reel

2,95 kr.

2,89 kr.

2,84 kr.

Min.: 2.500
Mult.: 2.500

: 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 25 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-TSSOP28R
Silicon Labs
2.500: 3,21 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16G-C-TSSOP28R

Mouser Part No
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 24 Weeks

Reel

3,21 kr.

3,15 kr.

3,10 kr.

Min.: 2.500
Mult.: 2.500

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

EFM8BB52F16I-C-QFN20
Silicon Labs
1: 12,09 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16I-C-QFN20

Mouser Part No
634-EFM852F16ICQFN20

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 24 Weeks

12,09 kr.

7,38 kr.

3,01 kr.

2,85 kr.

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

EFM8BB52F16I-C-QFN20R
Silicon Labs
2.500: 2,51 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16I-C-QFN20R

Mouser Part No
634-EFM852F16IQFN20R

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 24 Weeks

Reel

2,51 kr.

2,45 kr.

2,43 kr.

Min.: 2.500
Mult.: 2.500

: 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

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

EFM8BB52F16I-C-TSSOP20R
Silicon Labs
2.500: 3,04 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16I-C-TSSOP20R

Mouser Part No
634-EFM852F16ITOP20R

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 24 Weeks

Reel

3,04 kr.

2,98 kr.

2,93 kr.

Min.: 2.500
Mult.: 2.500

: 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

EFM8BB52F16I-C-TSSOP20
Silicon Labs
1: 10,52 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16I-C-TSSOP20

Mouser Part No
634-EFM852F16ITSOP20

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 24 Weeks

10,52 kr.

6,74 kr.

3,62 kr.

3,60 kr.

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 25 GPIO BB5 8-bit MCU

EFM8BB52F16I-C-TSSOP28
Silicon Labs
1: 11,19 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F16I-C-TSSOP28

Mouser Part No
634-EFM852F16ITSOP28

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 24 Weeks

11,19 kr.

7,12 kr.

3,83 kr.

3,82 kr.

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

TSSOP-28

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 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-TSSOP28
Silicon Labs
1: 6,48 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32G-C-TSSOP28

Mouser Part No
634-EFM852F32GCTOP28

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

6,48 kr.

4,83 kr.

4,56 kr.

4,24 kr.

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

TSSOP-28

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 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-QFN20R
Silicon Labs
2.500: 2,95 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32G-C-QFN20R

Mouser Part No
634-EFM852F32GQFN20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Reel

2,95 kr.

2,78 kr.

2,72 kr.

Min.: 2.500
Mult.: 2.500

: 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

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 29 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-QFN32R
Silicon Labs
1: 5,07 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32G-C-QFN32R

Mouser Part No
634-EFM852F32GQFN32R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 29 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Cut Tape

5,07 kr.

4,06 kr.

3,62 kr.

3,36 kr.

Reel

2,86 kr.

View

Min.: 1
Mult.: 1

: 2.500

16 kB

1.28 kB

QFN-32

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 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-TSSOP20R
Silicon Labs
2.500: 3,55 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32G-C-TSSOP20R

Mouser Part No
634-EFM852F32GTOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Reel

3,55 kr.

3,50 kr.

3,45 kr.

Min.: 2.500
Mult.: 2.500

: 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 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-TSSOP28R
Silicon Labs
2.500: 3,64 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32G-C-TSSOP28R

Mouser Part No
634-EFM852F32GTOP28R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Reel

3,64 kr.

3,57 kr.

3,52 kr.

Min.: 2.500
Mult.: 2.500

: 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 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-QFN20
Silicon Labs
1: 5,20 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32I-C-QFN20

Mouser Part No
634-EFM852F32ICQFN20

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

5,20 kr.

4,97 kr.

3,49 kr.

3,30 kr.

View

Min.: 1
Mult.: 1

32 kB

2.3 kB

QFN-20

16 I/O

1.8 V

5.5 V

SMD/SMT

- 40 C

+ 125 C

Cut Tape

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-TSSOP20R
Silicon Labs
2.500: 3,64 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32I-C-TSSOP20R

Mouser Part No
634-EFM852F32ITOP20R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 16 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Reel

3,64 kr.

3,57 kr.

3,52 kr.

Min.: 2.500
Mult.: 2.500

: 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-QFN20
Silicon Labs
1: 9,55 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB51F8I-C-QFN20

Mouser Part No
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 24 Weeks

9,55 kr.

6,09 kr.

3,32 kr.

3,31 kr.

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 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-TSSOP28R
Silicon Labs
2.500: 3,72 kr.
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
EFM8BB52F32I-C-TSSOP28R

Mouser Part No
634-EFMB52F32ITOP28R

Silicon Labs

8-bit Microcontrollers - MCU 5 Volt 8051 50 Mhz 32 kB flash 2.304 kB RAM 25 GPIO BB5 8-bit MCU

Learn More

Datasheet

Non-Stocked Lead-Time 24 Weeks

Reel

3,72 kr.

3,66 kr.

3,60 kr.

Min.: 2.500
Mult.: 2.500

: 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

EFM8BB52F32G-A-QFN32
Silicon Labs
1: 11,12 kr.
Non-Stocked

Mfr. Part No.
EFM8BB52F32G-A-QFN32

Mouser Part No
634-EFM8B52F32GAFN32

Silicon Labs

8-bit Microcontrollers - MCU

Learn More

Datasheet

Non-Stocked

11,12 kr.

7,06 kr.

5,21 kr.

4,54 kr.

View

Min.: 1
Mult.: 1

8051

32 kB

2.25 kB

QFN-32

50 MHz

12 bit

29 I/O

1.8 V

5.5 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8BB51 & EFM8BB52 Busy Bee 8-bit MCUs

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