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. 724-9915
Mfr. Part No.STM8S103K3T6C
SGD2.44
Each (In a Pack of 2)
units
STM8S LQFP Surface Mount 32 STM8 8bit 640 B, 8 kB 16MHz 1 kB 0 1 4 1 2.95 → 5.5 V
RS Stock No. 829-0131
Mfr. Part No.PIC24FJ128GB202-I/SP
BrandMicrochip
SGD5.48
Each (In a Pack of 2)
units
PIC24FJ SPDIP Through Hole 28 PIC 16bit 128 kB 32MHz 8 kB 1 1 9 3 2 to 3.6 V
RS Stock No. 168-7368
Mfr. Part No.STM8S103K3T6C
SGD1.499
Each (In a Tray of 250)
units
STM8S LQFP Surface Mount 32 STM8 8bit 8 kB, 640 B 16MHz 1 kB 0 1 4 1 2.95 → 5.5 V
RS Stock No. 887-7145
Mfr. Part No.PIC18F4620-I/PT
BrandMicrochip
SGD9.688
Each (In a Tray of 160)
units
PIC18F TQFP Surface Mount 44 PIC 8bit 1.024 kB, 64 kB 40MHz 3.986 kB 0 2 13 1 4.2 → 5.5 V
RS Stock No. 165-4090
Mfr. Part No.PIC24FJ128GB202-I/SP
BrandMicrochip
SGD5.478
Each (In a Tube of 15)
units
PIC24FJ SPDIP Through Hole 28 PIC 16bit 128 kB 32MHz 8 kB 1 1 9 3 2 → 3.6 V
RS Stock No. 145-9607
Mfr. Part No.STM32F103RCT6
SGD6.488
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. 467-1347
Mfr. Part No.PIC16F73-I/SP
BrandMicrochip
SGD5.58
Each
units
PIC16F SPDIP Through Hole 28 PIC 8bit 4K x 14 words 20MHz 192 B 0 2 5 1 4 → 5.5 V
RS Stock No. 328-2025
Mfr. Part No.PIC16C54C-04/P
BrandMicrochip
SGD2.34
Each
units
PIC16C PDIP Through Hole 18 PIC 8bit 512 x 12 words 4MHz 25 B 0 - - 0 2.5 → 5.5 V
RS Stock No. 165-5271
Mfr. Part No.STM8L052C6T6
SGD1.392
Each (In a Tray of 250)
units
STM8L LQFP Surface Mount 48 STM8 8bit 32 kB 32MHz 2 kB 0 1 25 1 1.8 → 3.6 V
RS Stock No. 146-0218
Mfr. Part No.PIC12LF1840T39A-I/ST
BrandMicrochip
SGD2.146
Each (In a Tube of 96)
units
PIC12F TSSOP Surface Mount 14 PIC 8bit 4 kwords 32MHz 256 B 1 1 4 1 1.8 → 3.6 V
RS Stock No. 916-3765
Mfr. Part No.PIC32MZ0512EFE064-I/PT
BrandMicrochip
SGD11.07
Each
units
PIC32MZ EF TQFP Surface Mount 64 - 32bit 512 kB 200MHz 128 kB 0 - 24 - 2.1 → 3.6 V
RS Stock No. 829-0576
Mfr. Part No.PIC32MX170F256B-I/SP
BrandMicrochip
SGD6.445
Each (In a Pack of 2)
units
PIC32MX SPDIP Through Hole 28 PIC 32bit 256 + 3 kB 50MHz 64 kB 0 1 10 2 2.3 to 3.6 V
RS Stock No. 754-5516
Mfr. Part No.PIC18F8722-I/PT
BrandMicrochip
SGD16.80
Each
units
PIC18F TQFP Surface Mount 80 PIC 8bit 1.024 kB, 128 kB 40MHz 3.936 kB 0 5 16 2 4.2 → 5.5 V
RS Stock No. 725-7837
Mfr. Part No.LPC1764FBD100,551
BrandNXP
SGD12.24
Each
units
LPC17 LQFP Surface Mount 100 ARM Cortex M3 32bit 128 kB 100MHz 32 kB 1 x Device, 1 x Host, 1 x OTG 2 8 3 3.3 V
RS Stock No. 841-7548
Mfr. Part No.PIC32MX170F256B-50I/SP
BrandMicrochip
SGD6.203
Each (In a Pack of 3)
units
PIC32MX SPDIP Through Hole 28 PIC 32bit 64 kB 50MHz 256 kB 0 5 10 2 2.3 to 3.6 V
RS Stock No. 405-597
Mfr. Part No.P8X32A-D40
SGD11.20
Each
units
Propeller PDIP Through Hole 40 P8X32A 32bit 64 kB 80MHz 32.768 kB 1 x Device - - 0 2.7 → 3.6 V
RS Stock No. 168-7367
Mfr. Part No.STM8S103F3P6
SGD1.627
Each (In a Tube of 74)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 8 kB, 640 B 16MHz 1 kB 0 1 5 1 2.95 → 5.5 V
RS Stock No. 165-4083
Mfr. Part No.PIC32MX170F256B-I/SP
BrandMicrochip
SGD5.243
Each (In a Tube of 15)
units
PIC32MX SPDIP Through Hole 28 PIC 32bit 256 + 3 kB 50MHz 64 kB 0 1 10 2 2.3 → 3.6 V
RS Stock No. 724-9902
Mfr. Part No.STM8S103F3P6
SGD1.92
Each (In a Pack of 2)
units
STM8S TSSOP Surface Mount 20 STM8 8bit 640 B, 8 kB 16MHz 1 kB 0 1 5 1 2.95 → 5.5 V
RS Stock No. 887-7142
Mfr. Part No.PIC18F4550-I/P
BrandMicrochip
SGD7.80
Each (In a Tube of 10)
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB, 256 B 48MHz 2.048 kB 1 x Device 2 13 1 4.2 to 5.5 V
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