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. 168-9899
Mfr. Part No.C8051F040-GQ
PHP689.322
Each (In a Tray of 90)
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB 0 2 8, 13 1 2.7 → 3.6 V
RS Stock No. 757-0654
Mfr. Part No.C8051F040-GQ
PHP577.69
Each
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB 0 2 8, 13 1 2.7 → 3.6 V
RS Stock No. 168-9916
Mfr. Part No.C8051F580-IQ
PHP411.264
Each (In a Tray of 250)
units
C8051F QFP Surface Mount 48 8051 8bit 128 kB 24MHz 8.448 kB 0 4 32 1 1.8 → 5.25 V
RS Stock No. 819-6881
Mfr. Part No.C8051F044-GQ
PHP490.17
Each
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB 0 1 13 1 3 V
RS Stock No. 169-0025
Mfr. Part No.C8051F044-GQ
PHP406.733
Each (In a Tray of 90)
units
C8051F TQFP Surface Mount 100 8051 8bit 64 kB 25MHz 4.352 kB 0 1 13 1 3 V
RS Stock No. 169-0183
Mfr. Part No.EFM8BB10F8G-A-QSOP24
PHP28.424
Each (In a Tube of 56)
units
EFM8BB QSOP Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B 0 - 16 1 2.2 → 3.6 V
RS Stock No. 865-6279
Mfr. Part No.EFM8BB10F8G-A-QSOP24
PHP33.02
Each (In a Pack of 20)
units
EFM8BB QSOP Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B 0 - 16 1 2.2 → 3.6 V
RS Stock No. 757-4839
Mfr. Part No.C8051F580-IQ
PHP442.75
Each
units
C8051F QFP Surface Mount 48 8051 8bit 128 kB 24MHz 8.448 kB 0 4 32 1 1.8 → 5.25 V
RS Stock No. 173-2725
Mfr. Part No.EFM32ZG210F32-QFN32
PHP68.853
Each (On a Reel of 1000)
units
EFM32ZG TQFN Surface Mount 32 ARM Cortex M0+ 32bit 32 kB 24MHz 4 kB 0 2 4 1 1.85 → 3.8 V
RS Stock No. 870-2369
Mfr. Part No.EZR32WG230F256R63G-B0
PHP403.865
Each (In a Pack of 2)
units
EZR32WG QFN Surface Mount 64 ARM Cortex M4 32bit 256 kB 48MHz 32 kB 0 1 1 2 1.98 → 3.8 V
RS Stock No. 168-9809
Mfr. Part No.C8051F310-GQ
PHP320.229
Each (In a Tray of 250)
units
C8051F LQFP Surface Mount 32 8051 8bit 16 kB 25MHz 1.28 kB 0 5 21 1 2.7 → 3.6 V
RS Stock No. 865-6342
Mfr. Part No.EFM8UB20F32G-B-QFN32
PHP79.346
Each (In a Pack of 10)
units
EFM8UB QFN Surface Mount 32 CIP-51 8bit 32 kB 48MHz 2.304 kB 1 - 20 1 3.3 V
RS Stock No. 168-9904
Mfr. Part No.C8051F342-GQ
PHP468.096
Each (In a Tray of 250)
units
C8051F LQFP Surface Mount 32 8051 8bit 64 kB 48MHz 4.352 kB 2 2 17 1 2.7 → 5.25 V
RS Stock No. 198-4567
Mfr. Part No.EFM32LG880F256G-F-QFP100
PHP284.15
Each (In a Pack of 2)
units
EFM32 LQFP100 Surface Mount 100 ARM Cortex M3 32bit 256 kB 48MHz - - - - - -
RS Stock No. 168-9915
Mfr. Part No.C8051F582-IQ
PHP380.746
Each (In a Tray of 250)
units
C8051F QFP Surface Mount 32 8051 8bit 128 kB 24MHz 8.448 kB 0 4 32 1 1.8 → 5.25 V
RS Stock No. 173-2728
Mfr. Part No.EFM32ZG222F32-QFP48T
PHP73.926
Each (On a Reel of 1000)
units
EFM32ZG QFP Surface Mount 48 ARM Cortex M0+ 32bit 32 kB 24MHz 4 kB 0 1 1 1 1.98 → 3.8 V
RS Stock No. 865-6294
Mfr. Part No.EFM8SB10F8G-A-QFN20
PHP41.141
Each (In a Pack of 20)
units
EFM8SB QFN Surface Mount 20 CIP-51 8bit 8 kB 25MHz 512 B 0 - 9 1 2.4 V
RS Stock No. 169-0064
Mfr. Part No.C8051F850-C-GU
PHP51.24
Each (In a Tube of 56)
units
C8051F QSOP Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B 0 1 16 1 2.2 → 3.6 V
RS Stock No. 198-4619
Mfr. Part No.EFM32WG942F256-B-QFP64
PHP275.556
Each (In a Tray of 160)
units
EFM32 TQFP64 Surface Mount 64 ARM Cortex M4 32bit 256 kB 48MHz - - - - - -
RS Stock No. 819-6780
Mfr. Part No.C8051F506-IM
PHP297.15
Each (In a Pack of 2)
units
C8051F QFN Surface Mount 32 8051 8bit 32 kB 50MHz 4.352 kB 0 1 25 1 1.8 → 5.25 V