8-bit Microcontrollers - MCU – Mouser United Kingdom

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

EFM8BB52F32G-C-QFN20
Silicon Labs
1: £1.20
3,614In Stock

Mfr. Part No.
EFM8BB52F32G-C-QFN20

Mouser Part No
634-EFM852F32GCQFN20

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

3,614In Stock

£1.20

£0.841

£0.73

£0.691

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

EFM8BB51F8G-C-QFN20R
Silicon Labs
1: £0.54
9,875In Stock

Mfr. Part No.
EFM8BB51F8G-C-QFN20R

Mouser Part No
634-EFM851F8GCQFN20R

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

9,875In Stock

Cut Tape

£0.54

£0.464

£0.432

£0.385

Reel

£0.287

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

EFM8BB51F16G-C-QFN20R
Silicon Labs
1: £1.11
6,565In Stock

Mfr. Part No.
EFM8BB51F16G-C-QFN20R

Mouser Part No
634-EFM851F16GQFN20R

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

6,565In Stock

Cut Tape

£1.11

£0.711

£0.636

£0.523

Reel

£0.331

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 32 kB flash 2.304 kB RAM 29 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-QFN32R
Silicon Labs
1: £1.27
13,390In Stock

Mfr. Part No.
EFM8BB52F32I-C-QFN32R

Mouser Part No
634-EFM852F32IQFN32R

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

13,390In Stock

Cut Tape

£1.27

£0.811

£0.721

£0.593

Reel

£0.366

View

Min.: 1
Mult.: 1

Reel: 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 25 GPIO BB5 8-bit MCU

EFM8BB52F16G-C-TSSOP28
Silicon Labs
1: £0.668
8,368In Stock

Mfr. Part No.
EFM8BB52F16G-C-TSSOP28

Mouser Part No
634-EFM852F16GTSOP28

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

8,368In Stock

£0.668

£0.57

£0.50

£0.472

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

TSSOP-28

25 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

EFM8BB51F8I-C-TSSOP20
Silicon Labs
1: £1.20
187In Stock

Mfr. Part No.
EFM8BB51F8I-C-TSSOP20

Mouser Part No
634-EFM851F8ICTSOP20

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

187In Stock

£1.20

£0.766

£0.678

£0.494

View

Min.: 1
Mult.: 1

8 kB

1.28 kB

TSSOP-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 16 kB flash 1.28 kB RAM 25 GPIO BB5 8-bit MCU

EFM8BB52F16I-C-TSSOP28R
Silicon Labs
1: £1.31
2,455In Stock

Mfr. Part No.
EFM8BB52F16I-C-TSSOP28R

Mouser Part No
634-EFM852F16ITOP28R

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

2,455In Stock

Cut Tape

£1.31

£0.834

£0.742

£0.611

Reel

£0.375

View

Min.: 1
Mult.: 1

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, 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-TSSOP28
Silicon Labs
1: £0.773
625In Stock

Mfr. Part No.
EFM8BB52F32I-C-TSSOP28

Mouser Part No
634-EFM852F32ICTOP28

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

625In Stock

£0.773

£0.658

£0.578

£0.546

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 29 GPIO BB5 8-bit MCU

EFM8BB52F32G-C-QFN32
Silicon Labs
1: £1.15
588In Stock
400Expected 16/02/2026

Mfr. Part No.
EFM8BB52F32G-C-QFN32

Mouser Part No
634-EFM852F32GCQFN32

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

588In Stock

400Expected 16/02/2026

£1.15

£0.737

£0.657

£0.553

View

Min.: 1
Mult.: 1

32 kB

2.25 kB

QFN-32

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: £0.526
2,390In 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

2,390In Stock

Cut Tape

£0.526

£0.449

£0.417

£0.373

Reel

£0.277

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

EFM8BB51F16I-C-QFN20R
Silicon Labs
1: £0.615
20,080In Stock

Mfr. Part No.
EFM8BB51F16I-C-QFN20R

Mouser Part No
634-EFM851F16IQFN20R

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

20,080In Stock

Cut Tape

£0.615

£0.525

£0.488

£0.436

Reel

£0.326

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

EFM8BB51F16G-C-TSSOP20
Silicon Labs
1: £0.63
500In Stock

Mfr. Part No.
EFM8BB51F16G-C-TSSOP20

Mouser Part No
634-EFM8516GCTSSOP20

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

500In Stock

£0.63

£0.54

£0.502

£0.423

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

EFM8BB51F16G-C-QFN20
Silicon Labs
1: £0.698
156In Stock

Mfr. Part No.
EFM8BB51F16G-C-QFN20

Mouser Part No
634-EFM851F16GCQFN20

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

156In Stock

£0.698

£0.594

£0.553

£0.466

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-QFN20
Silicon Labs
1: £1.20
194In Stock

Mfr. Part No.
EFM8BB51F16I-C-QFN20

Mouser Part No
634-EFM851F16ICQFN20

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

194In Stock

£1.20

£0.766

£0.695

£0.691

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-TSSOP20
Silicon Labs
1: £0.803
148In Stock

Mfr. Part No.
EFM8BB51F16I-C-TSSOP20

Mouser Part No
634-EFM851F16TSSOP20

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

148In Stock

£0.803

£0.684

£0.601

£0.567

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-TSSOP20
Silicon Labs
1: £0.593
297In Stock

Mfr. Part No.
EFM8BB51F8G-C-TSSOP20

Mouser Part No
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

£0.593

£0.51

£0.448

£0.444

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: £0.526
2,597In Stock

Mfr. Part No.
EFM8BB52F16G-C-QFN32

Mouser Part No
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

£0.526

£0.449

£0.418

£0.353

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: £0.615
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

£0.615

£0.525

£0.461

£0.46

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

EFM8BB52F16I-C-QFN32R
Silicon Labs
1: £1.20
2,500In Stock

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

2,500In Stock

Cut Tape

£1.20

£0.748

£0.645

£0.506

Reel

£0.314

View

Min.: 1
Mult.: 1

Reel: 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-TSSOP20
Silicon Labs
1: £0.698
6In Stock

Mfr. Part No.
EFM8BB52F32G-C-TSSOP20

Mouser Part No
634-EFM852F32GCTOP20

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

6In Stock

£0.698

£0.596

£0.524

£0.495

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

EFM8BB52F32I-C-QFN20
Silicon Labs
1: £0.608
30In Stock

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

30In Stock

£0.608

£0.52

£0.485

£0.409

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 29 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-QFN32
Silicon Labs
1: £0.646
439In Stock

Mfr. Part No.
EFM8BB52F32I-C-QFN32

Mouser Part No
634-EFM852F32ICQFN32

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

439In Stock

£0.646

£0.555

£0.516

£0.495

View

Min.: 1
Mult.: 1

16 kB

1.28 kB

QFN-32

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

EFM8BB52F32I-C-TSSOP20
Silicon Labs
1: £0.759
543In Stock

Mfr. Part No.
EFM8BB52F32I-C-TSSOP20

Mouser Part No
634-EFM852F32ICTOP20

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

543In Stock

£0.759

£0.644

£0.566

£0.565

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

EFM8BB52F32I-C-QFN20R
Silicon Labs
1: £1.23
Non-Stocked Lead-Time 16 Weeks

Mfr. Part No.
EFM8BB52F32I-C-QFN20R

Mouser Part No
634-EFM852F32IQFN20R

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 16 Weeks

Cut Tape

£1.23

£0.788

£0.70

£0.576

Reel

£0.355

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

EFM8BB51F8G-C-QFN20
Silicon Labs
1: £1.15
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

£1.15

£0.588

£0.40

£0.362

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

EFM8BB51 & EFM8BB52 Busy Bee 8-bit MCUs

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