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. 168-7233
Mfr. Part No.STM8L051F3P6
HK$7.531
Each (In a Tube of 74)
units
STM8L TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB - 1 10 1 3.6 V
RS Stock No. 795-7543
Mfr. Part No.STM8L051F3P6
HK$7.856
Each (In a Pack of 10)
units
STM8L TSSOP Surface Mount 20 STM8 8bit 8 kB 16MHz 1 kB - 1 10 1 3.6 V
RS Stock No. 821-0788
Mfr. Part No.PIC18LF4620-I/PT
BrandMicrochip
HK$51.80
Each (In a Pack of 160)
units
PIC18F TQFP Surface Mount 44 PIC 8bit 64 kB 40MHz 3.968 kB - 2 13 1 2 → 5.5 V
RS Stock No. 921-4545
Mfr. Part No.ATMEGA328P-PU
BrandMicrochip
HK$23.899
Each (In a Tube of 14)
units
ATmega PDIP Through Hole 28 AVR 8bit 1 kB, 32 kB 20MHz 2 kB - 3 6 1 1.8 → 5.5 V
RS Stock No. 902-8221
Mfr. Part No.R5F72375ADFP#V0
HK$126.73
Each
units
SuperH LQFP Surface Mount 120 SH-2A 32bit 32 (Flash) kB, 512 (ROM) kB 160MHz 64 kB - - 16 - 3 → 3.6 V
RS Stock No. 876-6884
Mfr. Part No.PIC18F2523-I/SP
BrandMicrochip
HK$41.288
Each (In a Tube of 15)
units
PIC18F SPDIP Through Hole 28 PIC 8bit 32 kB 40MHz 1.536 kB - 2 10 1 2 to 5.5 V
RS Stock No. 400-504
Mfr. Part No.PIC18F2523-I/SP
BrandMicrochip
HK$42.90
Each
units
PIC18F SPDIP Through Hole 28 PIC 8bit 32 kB, 256 B 40MHz 1.536 kB - 2 10 1 4.2 to 5.5 V
RS Stock No. 775-3903
Mfr. Part No.R7F0C80112ESP#AA0
HK$1.933
Each (In a Pack of 25)
units
R7F0C80 LSSOP Surface Mount 10 RL78-S1 8bit 1 kB 5MHz 128 B - - 4 1 2.4 → 5.5 V
RS Stock No. 791-8144
Mfr. Part No.LPC11U35FHI33/501,
BrandNXP
HK$31.785
Each (In a Pack of 2)
units
LPC11U QFN Surface Mount 33 ARM Cortex M0 32bit 64 kB 50MHz 12 kB 1 - 8 2 3.3 V
RS Stock No. 901-6192
Mfr. Part No.R5F56218BDFB#V0
HK$80.70
Each
units
RX600 LFQFP Surface Mount 144 RX 32bit 512 kB 100MHz 96 kB 2 1 12 2 2.7 → 3.6 V
RS Stock No. 402-279
Mfr. Part No.STM32F103C8T6
HK$50.97
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. 159-7420
Mfr. Part No.PIC16F1509-I/SO
BrandMicrochip
HK$9.853
Each (In a Tube of 38)
units
PIC16F SOIC Surface Mount 20 PIC 8bit 8192 words 20MHz 512 B - 4 12 1 2.3 → 5.5 V
RS Stock No. 899-6928
Mfr. Part No.ATXMEGA64A3U-AU
BrandMicrochip
HK$34.04
Each (In a Pack of 2)
units
ATxmega TQFP Surface Mount 64 AVR 64bit 68 kB 32MHz 4 kB 1 7 16 - 1.6 → 3.6 V
RS Stock No. 887-7145
Mfr. Part No.PIC18F4620-I/PT
BrandMicrochip
HK$46.041
Each (In a Tray of 160)
units
PIC18F TQFP Surface Mount 44 PIC 8bit 1.024 kB, 64 kB 40MHz 3.986 kB - 2 13 1 4.2 → 5.5 V
RS Stock No. 757-8184
Mfr. Part No.R5F56218BDFB#V0
HK$84.49
Each
units
RX600 LFQFP Surface Mount 144 RX 32bit 512 kB 100MHz 96 kB 2 1 12 2 2.7 → 3.6 V
RS Stock No. 165-4881
Mfr. Part No.PIC16F874-04/PT
BrandMicrochip
HK$58.13
Each (In a Tray of 160)
units
PIC16F TQFP Surface Mount 44 PIC 8bit 4K x 14 words, 128 x 8 words 4MHz 192 B - 2 8 1 4 → 5.5 V
RS Stock No. 681-1171
Mfr. Part No.PIC18F4620-I/PT
BrandMicrochip
HK$49.17
Each
units
PIC18F TQFP Surface Mount 44 PIC 8bit 1.024 kB, 64 kB 40MHz 3.986 kB - 2 13 1 4.2 → 5.5 V
RS Stock No. 914-8158
Mfr. Part No.STM32F410RBT6
HK$28.98
Each (In a Pack of 2)
units
STM32 LQFP Surface Mount 64 ARM Cortex M4 32bit 128 kB 100MHz 32 kB - - 16 - 1.7 → 3.6 V
RS Stock No. 761-7510
Mfr. Part No.PIC16F1509-I/SO
BrandMicrochip
HK$11.02
Each (In a Pack of 3)
units
PIC16F SOIC Surface Mount 20 PIC 8bit 8192 words 20MHz 512 B - 4 12 1 2.3 → 5.5 V
RS Stock No. 165-9774
Mfr. Part No.LPC11U35FHI33/501,
BrandNXP
HK$26.47
Each (In a Tray of 490)
units
LPC11U QFN Surface Mount 33 ARM Cortex M0 32bit 64 kB 50MHz 12 kB 1 - 8 2 3.3 V
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