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. 192-3614
Mfr. Part No.STM32F072CBU7
MYR10.292
Each (In a Tray of 260)
units
STM32 UFQFPN Surface Mount 48 ARM Cortex M0 32bit 128 kB 48MHz 16 kB 1 - 13 2 2 → 3.6 V
RS Stock No. 144-9101
Mfr. Part No.PIC18F25K20-I/SS
BrandMicrochip
MYR8.493
Each (In a Tube of 47)
units
PIC18F SSOP Surface Mount 28 PIC 8bit 32 kB, 256 B 64MHz 1.536 kB - 2 11 1 1.8 → 3.6 V
RS Stock No. 181-3777
Mfr. Part No.CY8C4745AZI-S413
MYR28.195
Each (In a Pack of 2)
units
PSoC 4700 TQFP Surface Mount 48 ARM Cortex M0 32bit 32 kB 48MHz 4 kB - 1 1 1 1.71 → 5.5 V
RS Stock No. 177-3455
Mfr. Part No.ATSAM4E16CA-AN
BrandMicrochip
MYR33.258
Each (In a Tray of 90)
units
ATSAM LQFP Surface Mount 100 - 32bit 1.024 MB 120MHz 128 kB 1 1 24 3 3.6 (Maximum) V
RS Stock No. 198-4582
Mfr. Part No.EFM32LG995F256G-F-BGA120
MYR28.04
Each (In a Pack of 2)
units
EFM32 BGA120 Surface Mount 120 ARM Cortex M3 32bit 256 kB 48MHz - - - - - -
RS Stock No. 177-2812
Mfr. Part No.ATXMEGA32E5-AUR
BrandMicrochip
MYR12.422
Each (On a Reel of 2000)
units
ATXMEGA TQFP Surface Mount 32 AVR 8 bit, 16bit 32 kB 32MHz 4 kB - 1 16 1 3.6 (Maximum) V
RS Stock No. 144-9600
Mfr. Part No.ATSAMD51J20A-AU
BrandMicrochip
MYR23.95
Each
units
ATSAMD51 TQFP Surface Mount 64 ARM Cortex M4 32bit 1 MB 120MHz 256 kB 1 1 24 6 1.71 → 3.6 V
RS Stock No. 127-8293
Mfr. Part No.ATMEGA324A-AU
BrandMicrochip
MYR16.42
Each (In a Pack of 2)
units
ATmega TQFP Surface Mount 44 AVR 8bit 32 kB 20MHz 2 kB - 1 8 - 1.8 → 5.5 V
RS Stock No. 189-4125
Mfr. Part No.STM32F091CCU6
MYR17.434
Each (In a Pack of 5)
units
STM32F UFQFPN Surface Mount 48 ARM Cortex M0 32bit 256 kB 48MHz 32 kB - - 10 2 2 → 3.6 V
RS Stock No. 133-1688
Mfr. Part No.ATTINY88-MMU
BrandMicrochip
MYR3.918
Each (In a Pack of 5)
units
AVR VQFN Surface Mount 28 AVR 8bit 8 kB 12MHz 512 B - 1 8 - 1.8 → 5.5 V
RS Stock No. 177-9633
Mfr. Part No.PIC18F26K22T-I/ML
BrandMicrochip
MYR12.534
Each (On a Reel of 1600)
units
PIC18F QFN Surface Mount 28 PIC 8bit 64 kB 64MHz 3.896 kB - 1 19 2 5.5 (Maximum) V
RS Stock No. 467-1353
Mfr. Part No.PIC16F73-I/SS
BrandMicrochip
MYR20.48
Each
units
PIC16F SSOP Surface Mount 28 PIC 8bit 4K x 14 words 20MHz 192 B - 2 5 1 4 → 5.5 V
RS Stock No. 177-3468
Mfr. Part No.ATSAMD20E17A-AU
BrandMicrochip
MYR8.581
Each (In a Tray of 250)
units
ATSAMD TQFP Surface Mount 32 - 32bit 128 kB 48MHz 16 kB - 1 10 4 3.3 V
RS Stock No. 758-1405
Mfr. Part No.R5F1006AASP#V0
MYR7.84
Each (In a Pack of 2)
units
RL78/G13 SSOP Surface Mount 20 RL78/G13 16bit 16 kB 32MHz 2 kB - 1 6 - 1.6 → 5.5 V
RS Stock No. 131-0267
Mfr. Part No.ATMEGA328-AU
BrandMicrochip
MYR9.866
Each (In a Pack of 5)
units
ATmega TQFP Surface Mount 32 AVR 8bit 32 kB 20MHz 2 kB - 1 8 - 1.8 → 5.5 V
RS Stock No. 757-8434
Mfr. Part No.R5F2L3ACMNFP#V0
MYR37.08
Each
units
R8C LFQFP Surface Mount 100 R8C 16bit 128 kB 20MHz 10 kB - 1 20 - 2.7 → 5.5 V
RS Stock No. 131-0349
Mfr. Part No.ATMEGA8535L-8JU
BrandMicrochip
MYR11.03
Each (In a Pack of 2)
units
ATmega PLCC Surface Mount 44 AVR 8bit 8 kB 8MHz 512 B - 1 8 - 2.7 → 5.5 V
RS Stock No. 192-8085
Mfr. Part No.R5F51138ADFP#3A
MYR28.008
Each (In a Tray of 90)
units
RX113 LFQFP Surface Mount 100 RX CPU 32bit 512 kB 32MHz 64 kB 1 - 17 9 1.8 → 3.6 V
RS Stock No. 869-6214
Mfr. Part No.PIC16LF1554-I/ST
BrandMicrochip
MYR3.72
Each (In a Pack of 10)
units
PIC16F TSSOP Surface Mount 14 PIC16 8bit 4096 words 32MHz 256 B - - 11 1 1.8 → 3.6 V
RS Stock No. 189-3854
Mfr. Part No.STM32F415ZGT6
MYR46.547
Each (In a Tray of 60)
units
STM32F LQFP Surface Mount 144 ARM Cortex M4 32bit 1.024 MB 168MHz 192 kB 2 - 24 3 1.8 → 3.6 V