.hide-partial { max-height: none; } .show-more { display: none; }

634-EFM8 8-bit Microcontrollers - MCU

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Results: 71

Applied Filters:

Core

Program Memory Size

Data RAM Size

Package / Case

Maximum Clock Frequency

ADC Resolution

Number of I/Os

Supply Voltage - Min

Supply Voltage - Max

Mounting Style

Data Bus Width

Minimum Operating Temperature

Maximum Operating Temperature

Series

Qualification

Packaging

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Part #

8-bit Microcontrollers - MCU 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

EFM8UB20F32G-B-QFN32R
Silicon Labs
1: $4.81
10,557In Stock

Mfr. Part #
EFM8UB20F32G-B-QFN32R

Mouser Part #
634-EFM8UB32GBQFN32R

Silicon Labs

8-bit Microcontrollers - MCU 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

Datasheet

10,557In Stock

Cut Tape

$4.81

$3.93

$3.41

$3.23

Reel

$2.45

View

Min.: 1
Mult.: 1

: 1,500

EFM8UB2

Reel, Cut Tape

8-bit Microcontrollers - MCU 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

EFM8UB20F32G-B-QFN32
Silicon Labs
1: $4.42
587In Stock

Mfr. Part #
EFM8UB20F32G-B-QFN32

Mouser Part #
634-EFM8UBF32GBQFN32

Silicon Labs

8-bit Microcontrollers - MCU 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

Datasheet

587In Stock

$4.42

$3.70

$3.15

$3.00

View

Min.: 1
Mult.: 1

CIP-51 8051

32 kB

2.25 kB

QFN-32

48 MHz

10 bit

25 I/O

3.3 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8UB2

Tube

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: $1.73
8,238In Stock

Mfr. Part #
EFM8BB52F16G-C-TSSOP28

Mouser Part #
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

8,238In Stock

$1.73

$1.48

$1.30

$1.22

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 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

EFM8SB20F32G-B-QFN24R
Silicon Labs
1: $5.21
865In Stock

Mfr. Part #
EFM8SB20F32G-B-QFN24R

Mouser Part #
634-EFM8SB32GBQFN24R

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

865In Stock

Cut Tape

$5.21

$3.80

$2.13

Reel

$1.96

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

32 kB

4.25 kB

QFN-24

25 MHz

10 bit

16 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8SB

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

EFM8BB52F32I-C-QFN20R
Silicon Labs
1: $2.36
Lead-Time 24 Weeks

Mfr. Part #
EFM8BB52F32I-C-QFN20R

Mouser Part #
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

Lead-Time 24 Weeks

Cut Tape

$2.36

$1.51

$1.34

$1.10

Reel

$0.698

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 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

EFM8SB20F64G-B-QFN24
Silicon Labs
1: $4.09
2,683In Stock

Mfr. Part #
EFM8SB20F64G-B-QFN24

Mouser Part #
634-EFM8SBF64GBQFN24

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

2,683In Stock

$4.09

$3.43

$2.87

$2.72

View

Min.: 1
Mult.: 1

CIP-51 8051

64 kB

4.25 kB

QFN-24

25 MHz

10 bit

16 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8SB

Tube

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

EFM8BB10F2I-A-QFN20
Silicon Labs
1: $1.38
3,158In Stock

Mfr. Part #
EFM8BB10F2I-A-QFN20

Mouser Part #
634-EFM8BB10F2IAFN20

Silicon Labs

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

Learn More

Datasheet

3,158In Stock

$1.38

$1.18

$1.04

$0.965

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

Tube

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: $2.79
11,530In Stock

Mfr. Part #
EFM8BB52F32I-C-QFN32R

Mouser Part #
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

11,530In Stock

Cut Tape

$2.79

$1.79

$1.60

$1.31

Reel

$0.828

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

EFM8BB51F8G-C-QFN20R
Silicon Labs
1: $1.41
9,875In Stock

Mfr. Part #
EFM8BB51F8G-C-QFN20R

Mouser Part #
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

$1.41

$1.20

$1.06

$0.999

Reel

$0.634

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 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

EFM8SB20F64G-B-QFN24R
Silicon Labs
1: $4.29
1,500In Stock

Mfr. Part #
EFM8SB20F64G-B-QFN24R

Mouser Part #
634-EFM8SB64GBQFN24R

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

1,500In Stock

Cut Tape

$4.29

$3.51

$3.04

$2.87

Reel

$2.15

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

64 kB

4.25 kB

25 MHz

10 bit

16 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8SB

Reel, Cut Tape, MouseReel

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: $2.29
166In Stock

Mfr. Part #
EFM8BB51F8I-C-TSSOP20

Mouser Part #
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

166In Stock

$2.29

$1.47

$1.30

$1.07

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: $2.88
2,435In Stock

Mfr. Part #
EFM8BB52F16I-C-TSSOP28R

Mouser Part #
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

2,435In Stock

Cut Tape

$2.88

$1.84

$1.64

$1.35

Reel

$0.844

View

Min.: 1
Mult.: 1

: 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 8051 48 MHz 64 kB flash 4 kB RAM 8-bit Universal Bee MCU

EFM8UB20F64G-B-QFN32R
Silicon Labs
1: $5.83
163In Stock

Mfr. Part #
EFM8UB20F64G-B-QFN32R

Mouser Part #
634-EFM8UB64GBQFN32R

Silicon Labs

8-bit Microcontrollers - MCU 8051 48 MHz 64 kB flash 4 kB RAM 8-bit Universal Bee MCU

Datasheet

163In Stock

Cut Tape

$5.83

$4.77

$4.13

$3.90

Reel

$3.02

View

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

64 kB

4.25 kB

QFN-32

48 MHz

10 bit

25 I/O

3.3 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8UB2

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-QFN20
Silicon Labs
1: $1.50
151In Stock

Mfr. Part #
EFM8BB51F16G-C-QFN20

Mouser Part #
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

151In Stock

$1.50

$1.28

$1.13

$1.00

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-TSSOP20
Silicon Labs
1: $1.56
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

$1.56

$1.30

$1.16

$1.08

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-TSSOP20
Silicon Labs
1: $1.64
1,452In Stock

Mfr. Part #
EFM8BB51F16G-C-TSSOP20

Mouser Part #
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

1,452In Stock

$1.64

$1.39

$1.23

$1.05

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 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

EFM8UB20F32G-B-QFP48
Silicon Labs
1: $5.52
7,873In Stock
End of Life

Mfr. Part #
EFM8UB20F32G-B-QFP48

Mouser Part #
634-EFM8UBF32GBQFP48

End of Life

Silicon Labs

8-bit Microcontrollers - MCU 8051 48 MHz 32 kB flash 2 kB RAM 8-bit Universal Bee MCU

Datasheet

7,873In Stock

$5.52

$4.61

$4.28

$4.15

View

Min.: 1
Mult.: 1

CIP-51 8051

32 kB

2.25 kB

QFP-48

48 MHz

10 bit

40 I/O

3.3 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8UB2

Tray

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: $1.35
236In Stock

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

236In Stock

$1.35

$1.16

$1.07

$0.93

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 29 GPIO BB5 8-bit MCU

EFM8BB52F32I-C-QFN32
Silicon Labs
1: $2.03
6In Stock
600On Order

Mfr. Part #
EFM8BB52F32I-C-QFN32

Mouser Part #
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

6In Stock

600On Order

$2.03

$1.44

$1.26

$1.13

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

EFM8BB21F16A-C-QFN20
Silicon Labs
1: $5.90
44In Stock
2,520Expected 2026-09-01

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

44In Stock

2,520Expected 2026-09-01

$5.90

$4.26

$3.87

$3.20

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

EFM8BB52F16G-C-QFN32
Silicon Labs
1: $1.35
319In Stock
2,400Expected 2026-08-25

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

319In Stock

2,400Expected 2026-08-25

$1.35

$1.16

$0.978

$0.933

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 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

EFM8SB20F64G-B-QFN32
Silicon Labs
1: $6.48
1,161In Stock
End of Life

Mfr. Part #
EFM8SB20F64G-B-QFN32

Mouser Part #
634-EFM8SBF64GBQFN32

End of Life

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

1,161In Stock

$6.48

$4.29

$3.92

$3.33

View

Min.: 1
Mult.: 1

CIP-51 8051

64 kB

4.25 kB

QFN-32

25 MHz

10 bit

24 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8SB

Tube

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: $2.55
1,696In Stock

Mfr. Part #
EFM8BB52F32G-C-QFN32

Mouser Part #
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

1,696In Stock

$2.55

$1.63

$1.45

$1.19

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-TSSOP20
Silicon Labs
1: $1.93
380In 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

380In Stock

$1.93

$1.39

$1.25

$1.11

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

EFM8BB52F32G-C-TSSOP20
Silicon Labs
1: $2.03
6In Stock

Mfr. Part #
EFM8BB52F32G-C-TSSOP20

Mouser Part #
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

$2.03

$1.74

$1.53

$1.33

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

634-EFM8 8-bit Microcontrollers - MCU

Mouser®

Company

Resources

Support