8-bit Microcontrollers - MCU

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EFM8™ Sleepy Bee 8-bit MCUs

Silicon Labs EFM8™ Sleepy Bee Family of MCUs are energy-friendly 8-bit microcontrollers with comprehensive features in small packages. They have low power consumption by combining innovative low energy techniques and short wake-up times from energy-saving modes. The Silicon Labs EFM8 are well suited for any battery-operated applications.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.	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
8-bit Microcontrollers - MCU 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F64G-B-QFN24R Silicon Labs 1: $3.74 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 about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,500In Stock	Cut Tape $3.74 $2.80 $2.55 $2.29 View Reel $1.72 $2.16 $2.12 $2.00 $1.72 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 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU EFM8SB10F8A-A-QFN24 Silicon Labs 1: $3.74 1,519In Stock	Mfr. Part # EFM8SB10F8A-A-QFN24 Mouser Part # 634-FM8SB10F8AAQFN24	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,519In Stock	$3.74 $3.07 $2.89 $2.69 View $2.55 $2.50 $2.30 $2.29 $2.24	Min.: 1 Mult.: 1	CIP-51 8051	8 kB	512 B		25 MHz	12 bit	17 I/O	1.8 V	3.6 V	SMD/SMT	8 bit	- 40 C	+ 85 C	EFM8SB	AEC-Q100	Tube
8-bit Microcontrollers - MCU 8051 25 MHz 64 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F64G-B-QFN24 Silicon Labs 1: $3.74 2,654In 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 about Silicon Labs silabs efm8 sleepy bee	Datasheet	2,654In Stock	$3.74 $2.93 $2.57 $2.37 View $2.30 $2.20 $2.13 $2.09 $2.07	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 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU EFM8SB10F8A-A-QFN20R Silicon Labs 1: $4.24 1,221In Stock End of Life	Mfr. Part # EFM8SB10F8A-A-QFN20R Mouser Part # 634-M8SB10F8AAQFN20R End of Life	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,221In Stock	Cut Tape $4.24 $3.16 $2.89 $2.59 Reel $2.20 View $2.44 $2.39 $2.21 $2.15	Min.: 1 Mult.: 1 : 1,500	CIP-51 8051	8 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	EFM8SB	AEC-Q100	Reel, 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: $5.85 1,101In 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 about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,101In Stock	$5.85 $3.87 $3.28 $3.00 View $2.86 $2.56 $2.52 $2.30 $2.29	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 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F32G-B-QFN32R Silicon Labs 1: $3.33 81In Stock End of Life	Mfr. Part # EFM8SB20F32G-B-QFN32R Mouser Part # 634-EFM8SB32GBQFN32R End of Life	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	81In Stock	Cut Tape $3.33 $2.99 $2.33 $2.20 Reel $1.82 View $2.12 $1.85 $1.79	Min.: 1 Mult.: 1 : 1,500	CIP-51 8051	32 kB	4.25 kB		25 MHz	10 bit	24 I/O	1.8 V	3.6 V	SMD/SMT	8 bit	- 40 C	+ 85 C	EFM8SB		Reel, 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: $4.72 1,498Expected 1/29/2027	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 about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,498Expected 1/29/2027	Cut Tape $4.72 $3.45 $3.07 $2.69 Reel $1.66 View $2.31 $1.74 $1.64	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 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F16G-B-QFN24 Silicon Labs 1: $2.77 1,911Expected 10/23/2026	Mfr. Part # EFM8SB20F16G-B-QFN24 Mouser Part # 634-EFM8SBF16GBQFN24	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	1,911Expected 10/23/2026	$2.77 $2.12 $1.89 $1.74 View $1.65 $1.61 $1.57 $1.53	Min.: 1 Mult.: 1	CIP-51 8051	16 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 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F16G-B-QFN24R Silicon Labs 1,500: $1.50 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # EFM8SB20F16G-B-QFN24R Mouser Part # 634-EFM8SB16GBQFN24R	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 16 kB flash 4 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	Non-Stocked Lead-Time 12 Weeks	Reel $1.50 $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 1,911: $1.66 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # EFM8SB20F32G-B-QFN24 Mouser Part # 634-EFM8SBF32GBQFN24	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	Non-Stocked Lead-Time 12 Weeks	$1.66 $1.63	Min.: 1,911 Mult.: 1,911	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 8 kB flash 0.5 kB RAM 8-bit Sleepy Bee MCU EFM8SB10F8A-A-QFN24R Silicon Labs 1,500: $2.43 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # EFM8SB10F8A-A-QFN24R Mouser Part # 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 about Silicon Labs silabs efm8 sleepy bee	Datasheet	Non-Stocked Lead-Time 12 Weeks	Reel $2.43 $2.41	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 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU EFM8SB20F32G-B-QFN32 Silicon Labs 1: $3.52 Non-Stocked Lead-Time 20 Weeks End of Life	Mfr. Part # EFM8SB20F32G-B-QFN32 Mouser Part # 634-EFM8SBF32GBQFN32 End of Life	Silicon Labs	8-bit Microcontrollers - MCU 8051 25 MHz 32 kB flash 4 kB RAM 8-bit Sleepy Bee MCU Learn More about Silicon Labs silabs efm8 sleepy bee	Datasheet	Non-Stocked Lead-Time 20 Weeks	$3.52 $2.67 $2.30 $2.12 View $2.00 $1.99 $1.92	Min.: 1 Mult.: 1	CIP-51 8051	32 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

EFM8™ Sleepy Bee 8-bit MCUs

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