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. 623-0083
Mfr. Part No.PIC12F508-I/P
BrandMicrochip
$1.81
Each
units
PIC12F PDIP Through Hole 8 PIC 8bit 512 x 12 words 4MHz 25 B - - - - 2 to 5.5 V
RS Stock No. 623-0421
Mfr. Part No.PIC16F690-I/P
BrandMicrochip
$4.18
Each
units
PIC16F PDIP Through Hole 20 PIC 8bit 256 B, 4096 x 14 words 20MHz 256 B - - 12 1 2 to 5.5 V
RS Stock No. 698-8921
Mfr. Part No.PIC16F1933-I/SO
BrandMicrochip
$2.65
Each
units
PIC16F SOIC Surface Mount 28 PIC 8bit 256 B, 4096 x 14 words 32MHz 256 B - 5 11 2 1.8 → 5.5 V
RS Stock No. 145-8964
Mfr. Part No.PIC16F1933-I/SO
BrandMicrochip
$2.426
Each (In a Tube of 27)
units
PIC16F SOIC Surface Mount 28 PIC 8bit 256 B, 4096 x 14 words 32MHz 256 B - 5 11 2 1.8 → 5.5 V
RS Stock No. 887-7148
Mfr. Part No.PIC12F675-I/SN
BrandMicrochip
$1.743
Each (In a Tube of 100)
units
PIC12F SOIC Surface Mount 8 PIC 8bit 128 B, 1024 x 14 words 20MHz 64 B - - 4 - 2 → 5.5 V
RS Stock No. 889-5351
Mfr. Part No.PIC12F508-I/P
BrandMicrochip
$0.995
Each (In a Tube of 60)
units
PIC12 PDIP Through Hole 8 PIC 8bit 512 x 12 words 4MHz 25 B - - - - 2 to 5.5 V
RS Stock No. 169-8235
Mfr. Part No.Z8F0822SJ020SG
BrandZilog
$5.223
Each (In a Tube of 27)
units
Z8 Encore! XP SOIC Surface Mount 28 Z8 8bit 8 kB 20MHz 1 kB - 1 5 1 2.7 → 3.6 V
RS Stock No. 625-9488
Mfr. Part No.Z8F0822SJ020SG
BrandZilog
$4.10
Each
units
Z8 Encore! XP SOIC Surface Mount 28 Z8 8bit 8 kB 20MHz 1 kB - 1 5 1 2.7 → 3.6 V
RS Stock No. 919-6295
Mfr. Part No.STM32F303CBT6TR
$4.169
Each (On a Reel of 2400)
units
STM32F LQFP Surface Mount 48 ARM Cortex M4 32bit 128 kB 72MHz 32 kB 1 5 39 2 3.6 V
RS Stock No. 810-7660
Mfr. Part No.STM32F303CBT6
$9.805
Each (In a Pack of 2)
units
STM32F LQFP Surface Mount 48 ARM Cortex M4 32bit 128 kB 72MHz 32 kB 1 2 39 3 2 → 3.6 V
RS Stock No. 169-7157
Mfr. Part No.MK20DX256VLH7
BrandNXP
$10.437
Each (In a Tray of 160)
units
Kinetis K2x LQFP Surface Mount 64 ARM Cortex M4 - 288 kB 72MHz 66 kB 1 1 2 1 1.71 → 3.6 V
RS Stock No. 168-7895
Mfr. Part No.STM32F303CBT6
$6.272
Each (In a Tray of 250)
units
STM32F LQFP Surface Mount 48 ARM Cortex M4 32bit 128 kB 72MHz 32 kB 1 2 39 3 2 → 3.6 V
RS Stock No. 544-1709
Mfr. Part No.PIC12F675-I/SN
BrandMicrochip
$1.942
Each (In a Pack of 5)
units
PIC12F SOIC Surface Mount 8 PIC 8bit 128 B, 1024 x 14 words 20MHz 64 B - - 4 - 2 → 5.5 V
RS Stock No. 887-7325
Mfr. Part No.PIC16F690-I/P
BrandMicrochip
$3.16
Each (In a Tube of 22)
units
PIC16F PDIP Through Hole 20 PIC 8bit 256 B, 4096 x 14 words 20MHz 256 B - - 12 1 2 to 5.5 V
RS Stock No. 168-9641
Mfr. Part No.MC68HC705C8ACFNE
BrandNXP
$25.722
Each (In a Tube of 26)
units
M68HC05 PLCC Surface Mount 44 HC05 8bit 8 kB 2.1MHz 304 B - - - 1 3 → 5.5 V
RS Stock No. 166-0921
Mfr. Part No.STM32L031K6T7
$3.108
Each (In a Tray of 250)
units
STM32 LQFP Surface Mount 32 ARM Cortex M0+ 32bit 32 kB 32MHz 8 kB - - 10 - 1.65 → 3.6 V
RS Stock No. 704-7722
Mfr. Part No.PIC18F45K22-I/PT
BrandMicrochip
$4.18
Each
units
PIC18F TQFP Surface Mount 44 PIC 8bit 32.768 kB, 256 B 16MHz 1.536 kB - 5 30 2 2.3 → 5.5 V
RS Stock No. 539-0291
Mfr. Part No.MC68HC705C8ACFNE
BrandNXP
$29.77
Each
units
M68HC05 PLCC Surface Mount 44 HC05 8bit 8 kB 2.1MHz 304 B - - - 1 3 → 5.5 V
RS Stock No. 889-5913
Mfr. Part No.PIC16F1825-I/SL
BrandMicrochip
$1.921
Each (In a Tube of 57)
units
PIC16F SOIC Surface Mount 14 PIC 8bit 14 kB 32MHz 1.024 kB, 256 B - 4 8 1 1.8 → 5.5 V
RS Stock No. 111-6473
Mfr. Part No.STM32L031K6T7
$4.704
Each (In a Pack of 5)
units
STM32 LQFP Surface Mount 32 ARM Cortex M0+ 32bit 32 kB 32MHz 8 kB - - 10 - 1.65 → 3.6 V