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CIP-51 8051 Core 8-bit Microcontrollers - MCU

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Part #

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: $4.32
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

$4.32

$2.82

$2.58

$2.22

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: $6.07
1,498Expected 28/8/2026

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 28/8/2026

Cut Tape

$6.07

$4.01

$3.64

$3.10

View

Reel

$2.58

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: $5.59
2,430Expected 4/9/2026

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 4/9/2026

Cut Tape

$5.59

$3.70

$3.37

$2.86

View

Reel

$2.15

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 75 MHz 32 kB flash 2.25 kB RAM 8-bit Laser Bee MCU

EFM8LB12F32E-C-QFP32
Silicon Labs
1: $7.07
1,043Expected 16/10/2026

Mfr. Part No.
EFM8LB12F32E-C-QFP32

Mouser Part No
634-LB12F32ECQFP32

Silicon Labs

8-bit Microcontrollers - MCU 8051 75 MHz 32 kB flash 2.25 kB RAM 8-bit Laser Bee MCU

Learn More

Datasheet

1,043Expected 16/10/2026

$7.07

$4.68

$4.26

$3.62

View

Min.: 1
Mult.: 1

CIP-51 8051

32 kB

2.25 kB

QFP-32

72 MHz

10 bit/12 bit/14 bit

28 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 105 C

EFM8LB1

Tray

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: $0.934
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

$0.934

$0.915

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

EFM8SB10F4G-A-QFN20R
Silicon Labs
1,500: $1.04
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8SB10F4G-A-QFN20R

Mouser Part No
634-8SB10F4GAQF20R

Silicon Labs

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

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$1.04

$1.02

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

: 1,500

CIP-51 8051

4 kB

512 B

QFN-20

25 MHz

12 bit

16 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

Reel

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

EFM8SB20F16G-B-QFN24R
Silicon Labs
1,500: $1.54
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8SB20F16G-B-QFN24R

Mouser Part No
634-EFM8SB16GBQFN24R

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$1.54

$1.47

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

: 1,500

CIP-51 8051

16 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

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

EFM8SB20F32G-B-QFN24
Silicon Labs
1: $3.01
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8SB20F32G-B-QFN24

Mouser Part No
634-EFM8SBF32GBQFN24

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$3.01

$2.53

$2.11

$2.01

View

Min.: 1
Mult.: 1

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

Tube

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: $3.06
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

$3.06

$2.58

$2.39

$2.11

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: $4.75
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

$4.75

$3.13

$2.88

$2.50

View

Reel

$1.74

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: $2.23
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

$2.23

$1.43

$1.27

$1.04

Reel

$0.669

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: $1.77
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

$1.77

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: $3.02
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

$3.02

$1.93

$1.71

$1.41

Reel

$0.934

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 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU

EFM8SB10F8A-A-QFN24R
Silicon Labs
1,500: $2.52
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
EFM8SB10F8A-A-QFN24R

Mouser Part No
634-M8SB10F8AAQFN24R

Silicon Labs

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$2.52

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

: 1,500

CIP-51 8051

8 kB

512 B

QFN-24

25 MHz

12 bit

17 I/O

1.8 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8SB

AEC-Q100

Reel

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: $1.70
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

$1.70

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

EFM8UB11F16G-C-QFN24
Silicon Labs
1,911: $1.84
Non-Stocked

Mfr. Part No.
EFM8UB11F16G-C-QFN24

Mouser Part No
634-8UB11F16GCQFN24

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$1.84

$1.82

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

CIP-51 8051

16 kB

2.25 kB

QFN-24

50 MHz

12 bit

17 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8UB

Tube

8-bit Microcontrollers - MCU

EFM8UB11F16G-C-QFN24R
Silicon Labs
1,500: $1.85
Non-Stocked

Mfr. Part No.
EFM8UB11F16G-C-QFN24R

Mouser Part No
634-8UB11F16GCQFN24R

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

Reel

$1.85

$1.82

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

: 1,500

CIP-51 8051

16 kB

2.25 kB

QFN-24

50 MHz

12 bit

17 I/O

2.2 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

EFM8UB

Reel

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU

C8051F317-GM
Silicon Labs
1,911: $7.70
Non-Stocked Lead-Time 25 Weeks

Mfr. Part No.
C8051F317-GM

Mouser Part No
634-C8051F317-GM

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU

Datasheet

Non-Stocked Lead-Time 25 Weeks

$7.70

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

CIP-51 8051

16 kB

1.28 kB

QFN-24

25 MHz

10 bit

21 I/O

2.7 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

C8051F317

Tube

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU

C8051F317-GMR
Silicon Labs
1: $15.42
Non-Stocked Lead-Time 25 Weeks

Mfr. Part No.
C8051F317-GMR

Mouser Part No
634-C8051F317-GMR

Silicon Labs

8-bit Microcontrollers - MCU 8051 25 MHz 16 kB 8-bit MCU

Datasheet

Non-Stocked Lead-Time 25 Weeks

Cut Tape

$15.42

$12.00

$11.44

$9.93

View

Reel

$8.23

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

16 kB

1.28 kB

QFN-24

25 MHz

10 bit

21 I/O

2.7 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

C8051F317

Reel, Cut Tape

8-bit Microcontrollers - MCU USB-Flash-16k-ADC-QFN28 OTP available (T321-GM)

C8051F321-GMR
Silicon Labs
1: $22.47
Non-Stocked Lead-Time 24 Weeks

Mfr. Part No.
C8051F321-GMR

Mouser Part No
634-C8051F321-GMR

Silicon Labs

8-bit Microcontrollers - MCU USB-Flash-16k-ADC-QFN28 OTP available (T321-GM)

Datasheet

Non-Stocked Lead-Time 24 Weeks

Cut Tape

$22.47

$17.08

$16.37

$14.43

View

Reel

$12.77

Min.: 1
Mult.: 1

: 1,500

CIP-51 8051

16 kB

2.3 kB

QFN-28

25 MHz

10 bit

21 I/O

2.7 V

3.6 V

SMD/SMT

8 bit

- 40 C

+ 85 C

C8051F321

Reel, Cut Tape

8-bit Microcontrollers - MCU

C8051F533-C-AT
Silicon Labs
1: $7.93
Non-Stocked

Mfr. Part No.
C8051F533-C-AT

Mouser Part No
634-C8051F533-C-AT

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$7.93

$5.45

$5.07

$4.46

View

Min.: 1
Mult.: 1

CIP-51 8051

4 kB

256 B

QFN-20

25 MHz

12 bit

16 I/O

2 V

5.25 V

SMD/SMT

8 bit

- 40 C

+ 125 C

C8051F533

AEC-Q100

8-bit Microcontrollers - MCU

C8051F533-C-ATR
Silicon Labs
2,500: $3.18
Non-Stocked

Mfr. Part No.
C8051F533-C-ATR

Mouser Part No
634-C8051F533-C-ATR

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$3.18

Min.: 2,500
Mult.: 1

CIP-51 8051

4 kB

256 B

QFN-20

25 MHz

12 bit

16 I/O

2 V

5.25 V

SMD/SMT

8 bit

- 40 C

+ 125 C

C8051F533

AEC-Q100

8-bit Microcontrollers - MCU

C8051F534-C-AT
Silicon Labs
1: $7.79
Non-Stocked

Mfr. Part No.
C8051F534-C-AT

Mouser Part No
634-C8051F534-C-AT

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$7.79

$5.36

$4.99

$4.38

View

Min.: 1
Mult.: 1

CIP-51 8051

4 kB

256 B

QFN-20

25 MHz

12 bit

16 I/O

2 V

5.25 V

SMD/SMT

8 bit

- 40 C

+ 125 C

C8051F534

AEC-Q100

8-bit Microcontrollers - MCU

C8051F534-C-ATR
Silicon Labs
2,500: $3.13
Non-Stocked

Mfr. Part No.
C8051F534-C-ATR

Mouser Part No
634-C8051F534-C-ATR

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$3.13

Min.: 2,500
Mult.: 1

CIP-51 8051

4 kB

256 B

QFN-20

25 MHz

12 bit

16 I/O

2 V

5.25 V

SMD/SMT

8 bit

- 40 C

+ 125 C

C8051F534

AEC-Q100

8-bit Microcontrollers - MCU

C8051F536-C-AT
Silicon Labs
1: $7.26
Non-Stocked

Mfr. Part No.
C8051F536-C-AT

Mouser Part No
634-C8051F536-C-AT

Silicon Labs

8-bit Microcontrollers - MCU

Datasheet

Non-Stocked

$7.26

$4.99

$4.65

$4.09

View

Min.: 1
Mult.: 1

CIP-51 8051

2 kB

256 B

QFN-20

25 MHz

12 bit

16 I/O

2 V

5.25 V

SMD/SMT

8 bit

- 40 C

+ 125 C

C8051F536

AEC-Q100

CIP-51 8051 Core 8-bit Microcontrollers - MCU

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C8051F317
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C8051F550
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EFM8BB1
EFM8BB2
EFM8LB1
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