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. 133-1645
Mfr. Part No.ATTINY45-20SU
BrandMicrochip
TWD37.80
Each (In a Pack of 5)
units
AVR EIAJ SOIC Surface Mount 8 AVR 8bit 4 kB 20MHz 256 B - 1 4 - 2.7 5.5 V
RS Stock No. 159-7449
Mfr. Part No.PIC32MX220F032B-50I/ML
BrandMicrochip
TWD80.60
Each (In a Tube of 61)
units
PIC32MX QFN Surface Mount 28 PIC 32bit 35 kB 40MHz 8 kB 1 1 9 2 2.3 3.6 V
RS Stock No. 829-1298
Mfr. Part No.R5F101GEDFB#30
TWD125.50
Each (In a Pack of 2)
units
RL78/G13 LFQFP Surface Mount 48 RL78 16bit 64 kB 32MHz 4 kB - - 10 5 1.6 5.5 V
RS Stock No. 768-2463
Mfr. Part No.R5F100FEAFP#V0
TWD87.50
Each (In a Pack of 2)
units
RL78/G13 LQFP Surface Mount 44 RL78/G13 16bit 4 kB, 64 kB 32MHz 4 kB - 1 10 - 1.6 5.5 V
RS Stock No. 876-6969
Mfr. Part No.PIC12F609-I/P
BrandMicrochip
TWD24.60
Each (In a Tube of 60)
units
PIC12F PDIP Through Hole 8 PIC 8bit 1024 words 20MHz 64 B - - - - 2 to 5.5 V
RS Stock No. 400-841
Mfr. Part No.PIC18F66J50-I/PT
BrandMicrochip
TWD122.00
Each
units
PIC18F TQFP Surface Mount 64 PIC 8bit 64 kB 48MHz 3.904 kB 1 x Device 5 8 2 2 → 3.6 V
RS Stock No. 175-0712
Mfr. Part No.STM32L451VET6
TWD216.90
Each (In a Tray of 90)
units
STM32L4 LQFP Surface Mount 100 ARM Cortex M4 32bit 512 kB 80MHz 160 kB - 1 16 3 3.6 (Maximum) V
RS Stock No. 467-2031
Mfr. Part No.PIC18F252-I/SO
BrandMicrochip
TWD194.00
Each
units
PIC18F SOIC Surface Mount 28 PIC 8bit 32 kB 40MHz 1.536 kB - 2 5 1 4.2 → 5.5 V
RS Stock No. 762-0440
Mfr. Part No.MSP430F5342IRGZT
TWD201.00
Each
units
MSP430 VQFN Surface Mount 48 MSP430 16bit 128 kB 25MHz 10 kB - 4 9 2 1.8 3.6 V
RS Stock No. 823-3891
Mfr. Part No.PIC18F66J94-I/PT
BrandMicrochip
TWD137.50
Each (In a Pack of 2)
units
PIC18F TQFP Surface Mount 64 PIC 8bit 64 kB 64MHz 4 kB - 7 16 2 2 3.6 V
RS Stock No. 175-7634
Mfr. Part No.MSP430FR2512IPW16
TWD64.20
Each (In a Pack of 5)
units
MSP430 TSSOP Surface Mount 16 - 16bit 8 kB 16MHz 2 kB - - 8 2 2 → 3.6 V
RS Stock No. 144-9431
Mfr. Part No.ATSAME53N20A-AU
BrandMicrochip
TWD172.80
Each (In a Tray of 450)
units
ATSAME53 TQFP Surface Mount 100 ARM Cortex M4 32bit 1 MB 120MHz 256 kB 1 1 28 8 1.71 → 3.6 V
RS Stock No. 124-0348
Mfr. Part No.R5F100GDANA#U0
TWD111.00
Each (In a Pack of 2)
units
RL78/G13 HWQFN Surface Mount 48 RL78 16bit 48 kB 32MHz 3 kB - - 10 - 1.6 5.5 V
RS Stock No. 168-4037
Mfr. Part No.MK20DX128VFT5
BrandNXP
TWD150.80
Each (In a Tray of 260)
units
Kinetis K2x QFN Surface Mount 48 ARM Cortex M4 32bit 160 kB 50MHz 18 kB 1 1 1 1 1.71 → 3.6 V
RS Stock No. 165-8930
Mfr. Part No.Z86E3016SSG
BrandZilog
TWD213.30
Each (In a Tube of 15)
units
Z8 SOIC Surface Mount 28 Z8 8bit 4 kB 16MHz 237 B - - - - 3.5 5.5 V
RS Stock No. 188-5372
Mfr. Part No.CY8C4245PVI-482
TWD113.60
Each (In a Tube of 47)
units
PSoC 4200 SSOP Surface Mount 28 ARM Cortex M0 32bit 32 kB 48MHz 4 kB - - 1 - 3.3 V
RS Stock No. 905-3220
Mfr. Part No.PIC16F1579-I/SS
BrandMicrochip
TWD37.00
Each (In a Pack of 5)
units
PIC16LF SSOP Surface Mount 20 8 bit CPU 8bit 14 kB 32MHz 1.024 kB - 4 12 - 2.3 5.5 V
RS Stock No. 131-0380
Mfr. Part No.ATSAM3S1AB-AU
BrandMicrochip
TWD101.50
Each (In a Pack of 2)
units
SAM3S LQFP Surface Mount 48 ARM Cortex M3 32bit 64 kB 64MHz 16 kB 1 1 8 - 1.8 V, 3.3 V
RS Stock No. 188-5358
Mfr. Part No.CY8C27643-24PVXI
TWD289.80
Each (In a Tube of 30)
units
CY8C27 SSOP Surface Mount 48 CPU 32bit 16 kB 24MHz 256 B - - 1 2 3 → 5.25 V
RS Stock No. 819-0772
Mfr. Part No.PIC18F65K80-I/MR
BrandMicrochip
TWD125.30
Each (In a Tube of 40)
units
PIC18F QFN Surface Mount 64 PIC18F 8bit 32 kB 64MHz 3.648 kB 1 4 11 1 1.8 → 5.5 V