Microcontrollers

Microcontrollers, also referred to as MCUs (microcontroller units), are embedded semiconductor devices used in circuit board design. They are essentially a computer within an integrated circuit (IC). Microcontrollers are mostly used in single-function embedded applications, unlike microprocessors which are designed for general-purpose work in Personal Computers, Tablets and Smartphones. Microcontrollers are limited in their clock speed compared to microprocessors by the relative slowness of their non-volatile Flash program memory.

What are they made up of?

Microcontrollers contain single or multiple processors (sometimes referred to as CPUs), plus memory and I/O peripherals. These peripherals include timers, ADCs (analogue-to-digital converters) and DACs (digital-to-analogue converters).

What does 8-bit mean?

Microcontrollers have a data bus width which describes the amount of data the MCU can process at a time. For example, an 8-bit microcontroller can process 8 bits at one time. Popular data bus widths include 8-bit, 16-bit and 32-bit MCUs.

What packages are there?

MCUs come in standard chip packages with various pin counts. Package types include:

  • LQFP
  • PDIP
  • QFN
  • SOIC
  • SSOP
  • TQFP
  • TSSOP

What are ARM processor cores?

Microcontrollers often contain an ARM microprocessor core. ARM represents an architecture developed by ARM Holdings, which is used by other companies to manufacture microprocessors and other devices such as System-on-Chip (SoCs).

  • Cortex-M0
  • Cortex-M0+
  • Cortex-M1
  • Cortex-M3
  • Cortex-M4
  • Cortex-M7
  • Cortex-M23
  • Cortex-M33
  • Cortex-M35P

Where are microcontrollers used?

  • Computers
  • Automotive
  • Robotics
  • Automation
  • Medical equipment
  • Home appliances

...
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Description Price Family Name Package Type Mounting Type Pin Count Device Core Data Bus Width Program Memory Size Maximum Frequency RAM Size USB Channels Number of PWM Units ADC Channels Number of SPI Channels Typical Operating Supply Voltage
RS Stock No. 169-0143
Mfr. Part No.C8051T634-GM
€1.222
Each (In a Tube of 91)
units
C8051T QFN Surface Mount 20 8051 8bit 2 kB 25MHz 768 B - 1 16 1 3 V
RS Stock No. 169-0007
Mfr. Part No.C8051F506-IM
€4.398
Each (In a Tube of 73)
units
C8051F QFN Surface Mount 32 8051 8bit 32 kB 50MHz 4.352 kB - 1 25 1 1.8 → 5.25 V
RS Stock No. 823-2113
Mfr. Part No.C8051T634-GM
€1.344
Each (In a Pack of 5)
units
C8051T QFN Surface Mount 20 8051 8bit 2 kB 25MHz 768 B - 1 16 1 3 V
RS Stock No. 168-9818
Mfr. Part No.C8051F020-GQ
€15.038
Each (In a Tray of 90)
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB - 5 8 1 2.7 → 3.6 V
RS Stock No. 526-8986
Mfr. Part No.C8051F020-GQ
€16.54
Each
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB - 5 8 1 2.7 → 3.6 V
RS Stock No. 819-6780
Mfr. Part No.C8051F506-IM
€4.99
Each (In a Pack of 2)
units
C8051F QFN Surface Mount 32 8051 8bit 32 kB 50MHz 4.352 kB - 1 25 1 1.8 → 5.25 V
RS Stock No. 169-0188
Mfr. Part No.EFM8SB10F8G-A-QFN24
€0.438
Each (In a Tube of 91)
units
EFM8SB QFN Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B - - 10 1 2.4 V
RS Stock No. 865-6298
Mfr. Part No.EFM8SB10F8G-A-QFN24
€0.431
Each (In a Pack of 20)
units
EFM8SB QFN Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B - - 10 1 2.4 V
RS Stock No. 757-4839
Mfr. Part No.C8051F580-IQ
€7.80
Each
units
C8051F QFP Surface Mount 48 8051 8bit 128 kB 24MHz 8.448 kB - 4 32 1 1.8 → 5.25 V
RS Stock No. 769-9638
Mfr. Part No.SiM3L167-C-GQ
€9.20
Each
units
SiM3 TQFP Surface Mount 80 ARM Cortex M3 32bit 256 kB 50MHz 32 kB - 1 24 2 1.8 → 3.8 V
RS Stock No. 761-7882
Mfr. Part No.SIM3U167-B-GQ
€8.76
Each
units
SiM3 TQFP Surface Mount 80 ARM Cortex M3 32bit 256 kB 80MHz 32 kB 1 1 2 3 1.8 → 3.6 V
RS Stock No. 819-6733
Mfr. Part No.C8051F585-IM
€6.985
Each (In a Pack of 2)
units
C8051F QFN Surface Mount 48 8051 8bit 96 kB 50MHz 8 kB - 1 32 1 1.8 → 5.25 V
RS Stock No. 819-6843
Mfr. Part No.EFM32WG380F256-QFP100T
€5.81
Each
units
EFM32WG QFP Surface Mount 100 ARM Cortex M4 32bit 256 kB 48MHz 32 kB 1 1 1 1 1.98 → 3.8 V
RS Stock No. 144-9654
Mfr. Part No.EFM8BB31F64I-B-5QFN32
€1.042
Each (In a Pack of 5)
units
EFM8BB3 QFN Surface Mount 32 CIP-51 8bit 64 kB 50MHz 4.352 kB - 1 20 1 2.2 → 3.6 V
RS Stock No. 772-0767
Mfr. Part No.EFM32LG980F256G-E-QFP100R
€4.56
Each
units
EFM32LG LQFP Surface Mount 100 ARM Cortex M3 32bit 256 kB 48MHz 32 kB 1 4 8 - 1.85 → 3.8 V
RS Stock No. 757-4788
Mfr. Part No.C8051F500-IQ
€5.87
Each
units
C8051F QFP Surface Mount 48 8051 8bit 64 kB 24MHz 4.352 kB - 2 32 1 1.8 → 5.25 V
RS Stock No. 173-2725
Mfr. Part No.EFM32ZG210F32-QFN32
€0.979
Each (On a Reel of 1000)
units
EFM32ZG TQFN Surface Mount 32 ARM Cortex M0+ 32bit 32 kB 24MHz 4 kB - 2 4 1 1.85 → 3.8 V
RS Stock No. 168-9945
Mfr. Part No.SIM3L154-C-GM
€6.805
Each (In a Tray of 490)
units
SiM3 QFN Surface Mount 40 ARM Cortex M3 32bit 128 kB 50MHz 32 kB - 1 20 2 1.8 → 3.8 V
RS Stock No. 168-9989
Mfr. Part No.C8051F975-A-GM
€1.649
Each (In a Tube of 91)
units
C8051F QFN Surface Mount 24 8051 8bit 16 kB 25MHz 4 kB - 1 19 1 3 V
RS Stock No. 819-6768
Mfr. Part No.C8051F553-IM
€3.665
Each (In a Pack of 2)
units
C8051F QFN Surface Mount 24 8051 8bit 32 kB 50MHz 2.304 kB - 1 18 1 1.8 → 5.25 V