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. 792-6035
Mfr. Part No.STM32F429IIT6
$26.69
Each
units
STM32F LQFP Surface Mount 176 ARM Cortex M4 32bit 2.048 MB 180MHz 256 kB 2 2 24 6 3.6 V
RS Stock No. 919-6324
Mfr. Part No.STM32F429IIT6
$23.529
Each (In a Tray of 40)
units
STM32F LQFP Surface Mount 176 ARM Cortex M4 32bit 2.048 MB 180MHz 256 kB 2 2 24 6 3.6 V
RS Stock No. 111-6471
Mfr. Part No.STM32F769BIT6
$28.04
Each
units
STM32 LQFP Surface Mount 208 ARM Cortex M7 32bit 2.048 MB 216MHz 512 kB 2 - 24 - 1.7 → 3.6 V
RS Stock No. 166-0971
Mfr. Part No.STM32F769BIT6
$20.702
Each (In a Tray of 360)
units
STM32 LQFP Surface Mount 208 ARM Cortex M7 32bit 2.048 MB 216MHz 512 kB 2 - 24 - 1.7 → 3.6 V
RS Stock No. 920-6468
Mfr. Part No.STM32F407VGT6
$18.106
Each (In a Tray of 90)
units
STM32F LQFP Surface Mount 100 ARM Cortex M4F 32bit 1.024 MB 168MHz 4 kB, 192 kB 1 x Device, 1 x Host, 1 x OTG 1 16 3 1.8 → 3.6 V
RS Stock No. 746-8226
Mfr. Part No.STM32F407VGT6
$20.55
Each
units
STM32F LQFP Surface Mount 100 ARM Cortex M4F 32bit 1.024 MB 168MHz 4 kB, 192 kB 1 x Device, 1 x Host, 1 x OTG 1 16 3 1.8 → 3.6 V
RS Stock No. 165-5558
Mfr. Part No.STM32F746NGH6
$21.362
Each (In a Tray of 160)
units
STM32F TFBGA Surface Mount 216 ARM Cortex M7 32bit 1.024 MB 216MHz 340 kB 2 2 24 - 1.7 → 3.6 V
RS Stock No. 145-8817
Mfr. Part No.STM32F373R8T6
$5.61
Each (In a Tray of 160)
units
STM32F LQFP Surface Mount 64 ARM Cortex M4 32bit 64 kB 72MHz 32 kB 1 2 16 3 2 → 3.6 V
RS Stock No. 177-7207
Mfr. Part No.STM32F427VIT6
$20.394
Each (In a Tray of 90)
units
STM32F LQFP Surface Mount 100 ARM Cortex M4 32bit 2.048 MB 180MHz 256 (System) kB, 4 (Backup) kB 1 2 16 - 1.7 → 3.6 V
RS Stock No. 724-9924
Mfr. Part No.STM8S105K4B6
$2.705
Each (In a Pack of 2)
units
STM8S SPDIP Through Hole 32 STM8 8bit 1.024 kB, 16 kB 16MHz 2 kB 0 2 7 1 2.95 → 5.5 V
RS Stock No. 920-6399
Mfr. Part No.STM32F051K8T6TR
$2.178
Each (On a Reel of 2400)
units
STM32F LQFP Surface Mount 32 ARM Cortex M0 32bit 64 kB 48MHz 8 kB 0 1 16 1 3.6 V
RS Stock No. 880-5399
Mfr. Part No.STM32F427VIT6
$22.68
Each
units
STM32F LQFP Surface Mount 100 ARM Cortex M4 32bit 2.048 MB 180MHz 256 (System) kB, 4 (Backup) kB 1 2 16 - 1.7 → 3.6 V
RS Stock No. 882-0287
Mfr. Part No.STM32F746NGH6
$27.52
Each
units
STM32F TFBGA Surface Mount 216 ARM Cortex M7 32bit 1.024 MB 216MHz 340 kB 2 2 24 - 1.7 → 3.6 V
RS Stock No. 168-7371
Mfr. Part No.STM8S105K4B6
$2.31
Each (In a Tube of 16)
units
STM8S SPDIP Through Hole 32 STM8 8bit 1.024 kB, 16 kB 16MHz 2 kB 0 2 7 1 2.95 → 5.5 V
RS Stock No. 810-7676
Mfr. Part No.STM32F373R8T6
$7.625
Each (In a Pack of 2)
units
STM32F LQFP Surface Mount 64 ARM Cortex M4 32bit 64 kB 72MHz 32 kB 1 2 16 3 2 → 3.6 V
RS Stock No. 168-7137
Mfr. Part No.STM8S003F3P6
$1.126
Each (In a Tube of 74)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB 0 1 5 1 6.5 V
RS Stock No. 793-1392
Mfr. Part No.STM8S003F3P6
$1.124
Each (In a Pack of 10)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB 0 1 5 1 6.5 V
RS Stock No. 810-7500
Mfr. Part No.STM32F051K8T6
$4.422
Each (In a Pack of 5)
units
STM32F LQFP Surface Mount 32 ARM Cortex M0 32bit 64 kB 48MHz 8 kB 0 1 13 1 2 → 3.6 V
RS Stock No. 791-7738
Mfr. Part No.STM32F051K8T6TR
$4.74
Each (In a Pack of 5)
units
STM32F LQFP Surface Mount 32 ARM Cortex M0 32bit 64 kB 48MHz 8 kB 0 1 16 1 3.6 V
RS Stock No. 168-7892
Mfr. Part No.STM32F051K8T6
$3.003
Each (In a Tray of 250)
units
STM32F LQFP Surface Mount 32 ARM Cortex M0 32bit 64 kB 48MHz 8 kB 0 1 13 1 2 → 3.6 V