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. 564-232
Mfr. Part No.PIC18F45K20-I/P
BrandMicrochip
PHP126.80
Each (In a Pack of 5)
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB, 256 B 64MHz 1.536 kB 0 2 14 1 1.8 to 3.6 V
RS Stock No. 121-4233
Mfr. Part No.PIC16F628A-I/P
BrandMicrochip
PHP121.904
Each (In a Pack of 5)
units
PIC16F628A PDIP Through Hole 18 PIC 8bit 3.5 kB 20MHz 224 B 0 0 - - 3 → 5.5 V
RS Stock No. 467-1375
Mfr. Part No.PIC16F74-I/P
BrandMicrochip
PHP220.88
Each
units
PIC16F PDIP Through Hole 40 PIC 8bit 4K x 14 words 20MHz 192 B 0 2 8 1 4 → 5.5 V
RS Stock No. 165-4695
Mfr. Part No.PIC16F74-I/P
BrandMicrochip
PHP220.88
Each (In a Tube of 10)
units
PIC16F PDIP Through Hole 40 PIC 8bit 4K x 14 words 20MHz 192 B 0 2 8 1 4 → 5.5 V
RS Stock No. 144-5759
Mfr. Part No.PIC18F452-I/P
BrandMicrochip
PHP316.347
Each (In a Tube of 10)
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB 40MHz 1.536 kB 0 2 8 1 4.2 → 5.5 V
RS Stock No. 467-2126
Mfr. Part No.PIC18F452-I/P
BrandMicrochip
PHP317.01
Each
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB 40MHz 1.536 kB 0 2 8 1 4.2 → 5.5 V
RS Stock No. 169-8235
Mfr. Part No.Z8F0822SJ020SG
BrandZilog
PHP148.359
Each (In a Tube of 27)
units
Z8 Encore! XP SOIC Surface Mount 28 Z8 8bit 8 kB 20MHz 1 kB 0 1 5 1 2.7 → 3.6 V
RS Stock No. 798-5309
Mfr. Part No.PIC16F1938-I/SP
BrandMicrochip
PHP111.46
Each (In a Pack of 5)
units
PIC16F PDIP Through Hole 28 PIC 8bit 16384 words 32MHz 1.024 kB 1 1 11 1 2.5 to 3.6 V
RS Stock No. 786-3915
Mfr. Part No.PIC18F45K50-I/P
BrandMicrochip
PHP154.41
Each (In a Pack of 5)
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB 48MHz 2.048 kB 1 2 25 1 2.3 to 5.5 V
RS Stock No. 145-9016
Mfr. Part No.PIC18F45K50-I/P
BrandMicrochip
PHP144.302
Each (In a Tube of 10)
units
PIC18F PDIP Through Hole 40 PIC 8bit 32 kB 48MHz 2.048 kB 1 2 25 1 2.3 → 5.5 V
RS Stock No. 841-7544
Mfr. Part No.PIC24FJ64GA202-I/SP
BrandMicrochip
PHP190.58
Each (In a Pack of 3)
units
PIC24FJ SPDIP Through Hole 28 PIC 16bit 64 kB 32MHz 8 kB 0 6 10 3 2 → 3.6 V
RS Stock No. 146-0298
Mfr. Part No.PIC24FJ64GA202-I/SP
BrandMicrochip
PHP170.019
Each (In a Tube of 15)
units
PIC24FJ SPDIP Through Hole 28 PIC 16bit 64 kB 32MHz 8 kB 0 6 10 3 2 → 3.6 V
RS Stock No. 625-9488
Mfr. Part No.Z8F0822SJ020SG
BrandZilog
PHP173.12
Each
units
Z8 Encore! XP SOIC Surface Mount 28 Z8 8bit 8 kB 20MHz 1 kB 0 1 5 1 2.7 → 3.6 V
RS Stock No. 912-6851
Mfr. Part No.PIC16F1938-I/SP
BrandMicrochip
PHP89.198
Each (In a Tube of 15)
units
PIC16F PDIP Through Hole 28 PIC 8bit 16384 words 32MHz 1.024 kB 1 1 11 1 2.5 to 3.6 V
RS Stock No. 738-0687
Mfr. Part No.ATTINY84A-SSU
BrandMicrochip
PHP103.86
Each
units
ATtiny SOIC Surface Mount 14 AVR 8bit 8 kB 20MHz 1.024 kB - 1 8 2 1.8 → 5.5 V
RS Stock No. 889-5203
Mfr. Part No.PIC18F25K22-I/SS
BrandMicrochip
PHP93.761
Each (In a Tube of 47)
units
PIC18F SSOP Surface Mount 28 PIC 8bit 32.768 kB, 256 B 16MHz 1.536 kB 0 5 19 2 2.3 → 5.5 V
RS Stock No. 625-8520
Mfr. Part No.Z86E0812PSG1866
BrandZilog
PHP142.14
Each
units
Z8 PDIP Through Hole 18 Z8 8bit 2 kB 12MHz 125 B 0 - - 0 4.5 → 5.5 V
RS Stock No. 703-7784
Mfr. Part No.PIC18F25K22-I/SS
BrandMicrochip
PHP118.11
Each
units
PIC18F SSOP Surface Mount 28 PIC 8bit 32.768 kB, 256 B 16MHz 1.536 kB 0 5 19 2 2.3 → 5.5 V
RS Stock No. 169-8224
Mfr. Part No.Z86E0812PSG1866
BrandZilog
PHP127.825
Each (In a Tube of 20)
units
Z8 PDIP Through Hole 18 Z8 8bit 2 kB 12MHz 125 B 0 - - 0 4.5 → 5.5 V
RS Stock No. 829-1386
Mfr. Part No.R5F104GFAFB#30
PHP178.96
Each (In a Pack of 2)
units
RL78 LFQFP Surface Mount 48 RL78 16bit 96 kB 32MHz 12 kB 0 - 10 5 1.6 → 5.5 V
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