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. 145-9607
Mfr. Part No.STM32F103RCT6
TWD156.90
Each (In a Tray of 160)
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 256 kB 72MHz 48 kB 1 x Device 2 16 3 2 → 3.6 V
RS Stock No. 714-1079
Mfr. Part No.STM32F103RCT6
TWD196.00
Each
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 256 kB 72MHz 48 kB 1 x Device 2 16 3 2 → 3.6 V
RS Stock No. 145-9610
Mfr. Part No.STM32F107RBT6
TWD158.60
Each (In a Tray of 160)
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 128 kB 72MHz 64 kB 1 x OTG 1 16 3 2 → 3.6 V
RS Stock No. 724-9716
Mfr. Part No.STM32F107RBT6
TWD142.00
Each
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 128 kB 72MHz 64 kB 1 x OTG 1 16 3 2 → 3.6 V
RS Stock No. 165-6817
Mfr. Part No.STM32F207VFT6
TWD264.70
Each (In a Tray of 540)
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 768 kB 120MHz 128 kB 2 2(4 x 16 bit) 16 3 3.6 V
RS Stock No. 791-7744
Mfr. Part No.STM32F207VGT6TR
TWD302.00
Each
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 1 MB 120MHz 128 kB 1 2 24 3 3.6 V
RS Stock No. 920-6440
Mfr. Part No.STM32F207VGT6TR
TWD291.50
Each (On a Reel of 1000)
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 1 MB 120MHz 128 kB 1 2 24 3 3.6 V
RS Stock No. 795-9255
Mfr. Part No.STM32F207VFT6
TWD277.00
Each
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 768 kB 120MHz 128 kB 2 2(4 x 16 bit) 16 3 3.6 V
RS Stock No. 110-6133
Mfr. Part No.STM32F070CBT6
TWD68.00
Each (In a Pack of 5)
units
STM32 LQFP Surface Mount 48 ARM Cortex M0 32bit 128 kB 48MHz 16 kB 1 - 13 - 2.4 → 3.6 V
RS Stock No. 102-3542
Mfr. Part No.STM32F103RBT6
TWD160.40
Each (In a Tray of 160)
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 128 kB 72MHz 20 kB 1 x Device 1 16 2 2 → 3.6 V
RS Stock No. 724-9729
Mfr. Part No.STM32F107VBT6
TWD157.00
Each
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 128 kB 72MHz 64 kB 1 x OTG 1 16 3 2 → 3.6 V
RS Stock No. 145-8756
Mfr. Part No.STM32F070CBT6
TWD49.60
Each (In a Tray of 250)
units
STM32 LQFP Surface Mount 48 ARM Cortex M0 32bit 128 kB 48MHz 16 kB 1 - 13 - 2.4 → 3.6 V
RS Stock No. 168-7137
Mfr. Part No.STM8S003F3P6
TWD20.00
Each (In a Tube of 74)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB - 1 5 1 6.5 V
RS Stock No. 402-251
Mfr. Part No.STM32F103RBT6
TWD166.00
Each
units
STM32F LQFP Surface Mount 64 ARM Cortex M3 32bit 128 kB 72MHz 20 kB 1 x Device 1 16 2 2 → 3.6 V
RS Stock No. 793-1392
Mfr. Part No.STM8S003F3P6
TWD18.50
Each (In a Pack of 10)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB - 1 5 1 6.5 V
RS Stock No. 920-6402
Mfr. Part No.STM32F107VBT6
TWD188.20
Each (In a Tray of 90)
units
STM32F LQFP Surface Mount 100 ARM Cortex M3 32bit 128 kB 72MHz 64 kB 1 x OTG 1 16 3 2 → 3.6 V
RS Stock No. 810-7641
Mfr. Part No.STM32F302CBT6
TWD112.50
Each (In a Pack of 2)
units
STM32F LQFP Surface Mount 48 ARM Cortex M4 32bit 128 kB 72MHz 32 kB 1 1 8 3 2 → 3.6 V
RS Stock No. 402-279
Mfr. Part No.STM32F103C8T6
TWD162.00
Each
units
STM32F LQFP Surface Mount 48 ARM Cortex M3 32bit 64 kB 72MHz 20 kB 1 x Device 1 10 2 2 → 3.6 V
RS Stock No. 165-6735
Mfr. Part No.STM32F302CBT6
TWD109.50
Each (In a Tray of 250)
units
STM32F LQFP Surface Mount 48 ARM Cortex M4 32bit 128 kB 72MHz 32 kB 1 1 8 3 2 → 3.6 V
RS Stock No. 102-3545
Mfr. Part No.STM32F103C8T6
TWD126.20
Each (In a Tray of 250)
units
STM32F LQFP Surface Mount 48 ARM Cortex M3 32bit 64 kB 72MHz 20 kB 1 x Device 1 10 2 2 → 3.6 V