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. 168-9809
Mfr. Part No.C8051F310-GQ
$9.514
Each (In a Tray of 250)
units
C8051F LQFP Surface Mount 32 8051 8bit 16 kB 25MHz 1.28 kB 0 5 21 1 2.7 → 3.6 V
RS Stock No. 526-8885
Mfr. Part No.C8051F310-GQ
$7.53
Each
units
C8051F LQFP Surface Mount 32 8051 8bit 16 kB 25MHz 1.28 kB 0 5 21 1 2.7 → 3.6 V
RS Stock No. 819-6708
Mfr. Part No.C8051F501-IM
$9.77
Each (In a Pack of 2)
units
C8051F QFN Surface Mount 48 8051 8bit 64 kB 50MHz 4.352 kB 0 1 32 1 1.8 → 5.25 V
RS Stock No. 865-6272
Mfr. Part No.EFM8BB10F8G-A-SOIC16
$0.703
Each (In a Pack of 20)
units
EFM8BB SOIC Surface Mount 16 CIP-51 8bit 8 kB 25MHz 512 B 0 - 12 1 2.2 → 3.6 V
RS Stock No. 526-8857
Mfr. Part No.C8051F320-GQ
$9.59
Each
units
C8051F LQFP Surface Mount 32 8051 8bit 16 kB 25MHz 2.304 kB 1 x Device 5 17 1 2.7 → 3.6 V
RS Stock No. 168-9805
Mfr. Part No.C8051F320-GQ
$10.186
Each (In a Tray of 250)
units
C8051F LQFP Surface Mount 32 8051 8bit 16 kB 25MHz 2.304 kB 1 x Device 5 17 1 2.7 → 3.6 V
RS Stock No. 865-6263
Mfr. Part No.EFM8BB10F2G-A-QFN20
$0.505
Each (In a Pack of 30)
units
EFM8BB QFN Surface Mount 20 CIP-51 8bit 2 kB 25MHz 256 B 0 - 15 1 2.2 → 3.6 V
RS Stock No. 168-9993
Mfr. Part No.C8051F501-IM
$8.343
Each (In a Tube of 43)
units
C8051F QFN Surface Mount 48 8051 8bit 64 kB 50MHz 4.352 kB 0 1 32 1 1.8 → 5.25 V
RS Stock No. 169-0182
Mfr. Part No.EFM8BB10F8G-A-SOIC16
$0.751
Each (In a Tube of 48)
units
EFM8BB SOIC Surface Mount 16 CIP-51 8bit 8 kB 25MHz 512 B 0 - 12 1 2.2 → 3.6 V
RS Stock No. 169-0180
Mfr. Part No.EFM8BB10F2G-A-QFN20
$0.506
Each (In a Tube of 120)
units
EFM8BB QFN Surface Mount 20 CIP-51 8bit 2 kB 25MHz 256 B 0 - 15 1 2.2 → 3.6 V
RS Stock No. 819-6985
Mfr. Part No.C8051F133-GQ
$18.15
Each
units
C8051F TQFP Surface Mount 64 8051 8bit 64 kB 100MHz 8.448 kB 0 1 8 1 3.3 V
RS Stock No. 168-9910
Mfr. Part No.C8051F500-IQ
$8.15
Each (In a Tray of 250)
units
C8051F QFP Surface Mount 48 8051 8bit 64 kB 24MHz 4.352 kB 0 2 32 1 1.8 → 5.25 V
RS Stock No. 757-4788
Mfr. Part No.C8051F500-IQ
$9.56
Each
units
C8051F QFP Surface Mount 48 8051 8bit 64 kB 24MHz 4.352 kB 0 2 32 1 1.8 → 5.25 V
RS Stock No. 169-0044
Mfr. Part No.C8051F133-GQ
$19.702
Each (In a Tray of 160)
units
C8051F TQFP Surface Mount 64 8051 8bit 64 kB 100MHz 8.448 kB 0 1 8 1 3.3 V
RS Stock No. 168-9828
Mfr. Part No.C8051F350-GQ
$10.884
Each (In a Tray of 250)
units
C8051F LQFP Surface Mount 32 8051 8bit 8 kB 50MHz 768 B 0 3 8 1 2.7 → 3.6 V
RS Stock No. 914-0283
Mfr. Part No.EFM8BB31F16G-A-QFN24
$1.06
Each (In a Pack of 10)
units
EFM8 QFN Surface Mount 16 CIP-51, 8051 8bit 16 kB 50MHz 2.304 kB 0 1 12 - 2.2 → 3.6 V
RS Stock No. 865-6294
Mfr. Part No.EFM8SB10F8G-A-QFN20
$1.033
Each (In a Pack of 20)
units
EFM8SB QFN Surface Mount 20 CIP-51 8bit 8 kB 25MHz 512 B 0 - 9 1 2.4 V
RS Stock No. 169-0186
Mfr. Part No.EFM8SB10F8G-A-QFN20
$0.99
Each (In a Tube of 100)
units
EFM8SB QFN Surface Mount 20 CIP-51 8bit 8 kB 25MHz 512 B 0 - 9 1 2.4 V
RS Stock No. 526-9197
Mfr. Part No.C8051F301-GM
$3.74
Each
units
C8051F QFN Surface Mount 11 8051 8bit 8 kB 25MHz 256 B 0 3 - 0 2.7 → 3.6 V
RS Stock No. 169-0064
Mfr. Part No.C8051F850-C-GU
$1.32
Each (In a Tube of 56)
units
C8051F QSOP Surface Mount 24 CIP-51 8bit 8 kB 25MHz 512 B 0 1 16 1 2.2 → 3.6 V