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. 177-3110
Mfr. Part No.AT90CAN128-16AUR
HK$64.43
Each
units
AT90 TQFP Surface Mount 64 AVR 8bit 128 kB 16MHz 4 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3407
Mfr. Part No.AT89C51CC03UA-RDTUM
HK$56.092
Each (In a Tray of 160)
units
AT89C51 VQFP Surface Mount 64 80C51 8bit 64 kB 40 2.048 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3606
Mfr. Part No.AT91SAM7S128D-AU
HK$66.52
Each
units
AT91 LQFP Surface Mount 64 ARM 32bit 128 kB 55 128 kB 1 1 8 1 3.3 V
RS Stock No. 177-3404
Mfr. Part No.AT89C51CC03CA-RDTUM
HK$57.775
Each (In a Tray of 160)
units
AT89C51 VQFP Surface Mount 64 80C51 8bit 64 kB 40 2.048 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-2486
Mfr. Part No.PIC16LF722A-I/SS
HK$9.46
Each (In a Pack of 10)
units
PIC16LF SSOP Surface Mount 28 PIC 8bit 3.5 kB 20 128 B - 1 11 1 3.6 (Maximum) V
RS Stock No. 177-3024
Mfr. Part No.ATSAM4E16EA-AUR
HK$76.79
Each
units
ATSAM LQFP Surface Mount 144 ARM Cortex M4 32bit 1.024 MB 32.768 128 kB 1 1 24 3 3.6 (Maximum) V
RS Stock No. 177-2162
Mfr. Part No.PIC16LF722A-I/SS
HK$8.691
Each (In a Tube of 47)
units
PIC16LF SSOP Surface Mount 28 PIC 8bit 3.5 kB 20 128 B - 1 11 1 3.6 (Maximum) V
RS Stock No. 177-3405
Mfr. Part No.AT89C51CC03CA-RLTUM
HK$55.01
Each (In a Tray of 160)
units
AT89C51 VQFP Surface Mount 44 80C51 8bit 64 kB 40 2.048 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3871
Mfr. Part No.AT89C51CC03CA-RLTUM
HK$66.28
Each
units
AT89C51 VQFP Surface Mount 44 80C51 8bit 64 kB 40 2.048 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3734
Mfr. Part No.AT32UC3L0256-AUT
HK$61.82
Each
units
AT32 TQFP Surface Mount 48 AVR 32bit 256 kB 50 32 kB - 1 8 5 3.6 (Maximum) V
RS Stock No. 177-3421
Mfr. Part No.AT91SAM7S128D-AU
HK$50.335
Each (In a Tray of 160)
units
AT91 LQFP Surface Mount 64 ARM 32bit 128 kB 55 128 kB 1 1 8 1 3.3 V
RS Stock No. 177-3424
Mfr. Part No.AT91SAM7SE256B-AU
HK$73.265
Each (In a Tray of 72)
units
AT91 LQFP Surface Mount 128 ARM 32bit 256 kB 48 32 kB 1 1 8 1 3.6 (Maximum) V
RS Stock No. 177-2992
Mfr. Part No.ATMEGA32U4-AUR
HK$35.33
Each (In a Pack of 2)
units
ATmega TQFP Surface Mount 44 AVR 8bit 32 kB 16MHz 2.5 kB 1 1 12 1 5.5 (Maximum) V
RS Stock No. 177-2786
Mfr. Part No.ATMEGA88PA-AUR
HK$10.40
Each (On a Reel of 2000)
units
ATmega TQFP Surface Mount 32 AVR 8bit 8 kB 20MHz 1 kB - 1 8 2 5.5 (Maximum) V
RS Stock No. 177-3560
Mfr. Part No.PIC18F43K22-I/PT
HK$16.857
Each (In a Tray of 160)
units
PIC18F TQFP Surface Mount 44 PIC 8bit 8 kB 16 512 B - 1 28 2 1.8 → 5.5 V
RS Stock No. 177-2767
Mfr. Part No.AT90CAN128-16AUR
HK$53.54
Each (On a Reel of 1000)
units
AT90 TQFP Surface Mount 64 AVR 8bit 128 kB 16MHz 4 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3398
Mfr. Part No.AT32UC3L0256-AUT
HK$50.94
Each (In a Tray of 250)
units
AT32 TQFP Surface Mount 48 AVR 32bit 256 kB 50 32 kB - 1 8 5 3.6 (Maximum) V
RS Stock No. 177-3834
Mfr. Part No.AT89C51CC03CA-RDTUM
HK$75.46
Each
units
AT89C51 VQFP Surface Mount 64 80C51 8bit 64 kB 40 2.048 kB - 1 8 1 5.5 (Maximum) V
RS Stock No. 177-3672
Mfr. Part No.AT91SAM7X256C-AU
HK$79.06
Each
units
AT91 LQFP Surface Mount 100 ARM 32bit 256 kB 55MHz 64 kB 1 1 8 2 3.6 (Maximum) V
RS Stock No. 177-3425
Mfr. Part No.AT91SAM7X256C-AU
HK$67.713
Each (In a Tray of 90)
units
AT91 LQFP Surface Mount 100 ARM 32bit 256 kB 55 64 kB 1 1 8 2 3.6 (Maximum) V