STC Microcontroller Unlock

Supported STC Microcontroller Series

We support unlock and firmware extraction for all major STC families. If your exact part isn't listed, contact us – we're constantly researching new types.

STC10xxx Series

STC10F04 STC10F04XE STC10F08 STC10F08XE STC10F12 STC10F12XE STC10F14X

STC11xxx Series

STC11F01E STC11F02E STC11F03E STC11F04E STC11F05E IAP11F06 STC11F60XE STC11F56XE STC11F52XE STC11F48XE STC11F40XE STC11F32XE STC11F20XE STC11F16XE STC11F08XE STC11F62X

STC12Cxx / STC12LExx Series

STC12C1052 STC12C2052 STC12C4052 STC12C5052 STC12C5410 STC12C5410AD STC12C5402 STC12C5402AD STC12C5404 STC12C5404AD STC12C546 STC12C5406AD STC12C5408 STC12C5408AD STC12C5412 STC12C5412RD STC12LE1052 STC12LE2052 STC12LE4052 STC12LE5052 STC12C5A08S2 STC12C5A16S2 STC12C5A32S2 STC12C5A40S2 STC12C5A48S2 STC12C5A52S2 STC12C5A56S2 STC12C5A60S2 IAP12C5A62S2 STC12LE5A08S2 STC12LE5A16S2 STC12LE5A32S2 STC12LE5A40S2 STC12LE5A48S2 STC12LE5A52S2 STC12LE5A56S2 STC12LE5A60S2 IAP12LE5A62S2 STC12C5A08AD STC12C5A16AD STC12C5A32AD STC12C5A40AD STC12C5A48AD STC12C5A52AD STC12C5A56AD STC12C5A60AD IAP12C5A62AD STC12LE5A08AD STC12LE5A16AD STC12LE5A32AD STC12LE5A40AD STC12LE5A48AD STC12LE5A52AD STC12LE5A56AD STC12LE5A60AD IAP12LE5A62AD STC12C5201AD STC12C5202AD STC12C5203AD STC12C5204AD STC12C5205AD STC12C5206AD STC12LE5201AD STC12LE5202AD STC12LE5203AD STC12LE5204AD STC12LE5205AD STC12LE5206AD STC12C5604AD STC12C5608AD STC12C5612AD STC12C5616AD STC12C5620AD STC12C5624AD STC12C5628AD STC12C5630AD STC12LE5604AD STC12LE5608AD STC12LE5612AD STC12LE5616AD STC12LE5620AD STC12LE5624AD STC12LE5628AD STC12LE5630AD

STC15Fxx / STC15Lxx / STC15Wxx Series

STC15F100W STC15F101W STC15F102W STC15F104W STC15F2K08S2 STC15F2K16S2 STC15F2K24AS STC15F2K32S2 STC15F2K40S2 STC15F2K48AS STC15F2K48S2 STC15F2K56S2 STC15F2K60S STC15F2K60S2 IAP15F105W IAP15F2K61S IAP15F2K61S2 IRC15F107W IRC15F2K63S2 STC15L100W STC15L101W STC15L102W STC15L104W STC15L2K08S2 STC15L2K16S2 STC15L2K32S2 STC15L2K40S2 STC15L2K48S2 STC15L2K56S2 STC15L2K60S2 IAP15L105W IAP15L2K61S2 STC15W100 STC15W101 STC15W102 STC15W104 STC15W1K08PWM STC15W1K16PWM STC15W1K16S STC15W1K24S STC15W201S STC15W202S STC15W203S STC15W204S STC15W401AS STC15W402AS STC15W404AS STC15W404S STC15W408AS STC15W408S STC15W410S STC15W413AS STC15W4K16S4 STC15W4K32S4 STC15W4K40S4 STC15W4K48S4 STC15W4K56S4 IAP15W1K29S IAP15W205S IAP15W413S IAP15W4K58S4 IAP15W4K61S4 IRC15W107 IRC15W1K31 IRC15W207S IRC15W415AS IRC15W415S IRC15W4K63S4

STC89Cxx / STC89LExx / LVxx Series

STC89C51RC STC89C52RC STC89C53RC STC89C54RD+ STC89C58RD+ STC89C516RD STC89C516RD+ STC89C58RD STC89LE51RC STC89LE52RC STC89LE53RC STC89LE54RD+ STC89LE58RD+ STC89LE516RD+ STC89LE516AD STC89LE516X2 STC89LE52AD STC89LE54AD STC89LE556AD STC89LE556X2 STC89LE58AD STC89LV516RD STC89LV58RD

STC90Cxx Series

STC90C51RC STC90C52RC STC90C53RC STC90LE51RC STC90LE52RC STC90LE53RC STC90C54RD+ STC90C58RD+ STC90C510RD+ STC90C512RD+ STC90C514RD+ STC90C516RD+ STC90LE54RD+ STC90LE58RD+ STC90LE510RD+ STC90LE512RD+ STC90LE514RD+ STC90LE516RD+ STC90C52AD STC90C54AD STC90C58AD STC90C514AD STC90C516AD STC90LE52AD STC90LE54AD STC90LE58AD STC90LE514AD STC90LE516AD

It is impossible to list all part numbers we can unlock. If your chip is not listed, please contact us – we can research new types to fit your demand.

About STC Microcontrollers

STC89xx series, produced by STC MCU Limited, is an 8-bit single-chip microcontroller with a fully compatible instruction set with the industrial-standard 80C51 series. It embeds 64K bytes of flash memory for application program, shared with In-System-Programming (ISP) code. Firmware extraction from an STC89xx is possible through the ISP interface when the chip is not locked. ISP and IAP (In-Application-Programming) support users to upgrade program and data in system. ISP allows downloading new code without removing the microcontroller from the end product; IAP means the device can write non-volatile data in Flash memory while the application program is running. On-chip RAM of 1280 bytes or 512 bytes meets diverse application requirements. The user can configure the device to run in 12 clocks per machine cycle (standard 80C51 speed) or 6 clocks per machine cycle to achieve twice the performance. The STC89xx series retains all features of the standard 80C51 and adds an extra I/O port (P4), Timer 2, and more. Because the core is 8051-compatible, reverse engineering of STC firmware can reuse standard 8051 disassembly tools.

For many designers, choosing an STC part is an easy way to crack through the cost and performance limits of older 8051 offerings. STC 8051s vs Other 8051s – STC offers additional hardware peripherals. Some STC microcontrollers like STC89C52RC are similar to standard ones, while others like STC8A8K64S4A12 are more robust with advanced features. Key differences include:

Packages / Sizes: STC offers various DIP and SMD packages, from 8-pin to 40-pin, saving PCB space.
Speed / Operating Frequency: STC micros are relatively faster – e.g., STC89C52RC can be clocked at 80MHz (vs 33MHz for AT89S52).
Additional Hardware Peripherals: Built-in ADC, EEPROM, watchdog timer, extra interrupts, etc.
Programming Interface: STC chips can be programmed via a simple USB-TTL serial converter (no dedicated programmer needed).
Operating Voltage: Some STC models operate at 2.0–3.6V (LE series) or 3.6–5.5V (C series), suitable for battery-powered devices.

STC12C5620AD is a 1T architecture 8051 CPU that executes instructions in 1–6 clock cycles (about 8–12 times faster than a standard 8051). It features 10-bit ADC (100k samples/sec), on-chip crystal oscillator, MAX810 reset, 4-channel PCA/PWM, SPI, and a one-time enabled watchdog timer. The one-time enabled watchdog helps the device recover after a fault or an attempted attack on the program flow.

STC12C5A60S2 is another 1T 8051 device, executing instructions in 1–6 clock cycles (6–7 times faster). It adds two extra I/O ports (P4 and P5), a 10-source, 4-priority interrupt structure, 10-bit ADC, two UARTs, on-chip oscillator, 2-channel PCA/PWM, SPI, and a watchdog timer. The extra I/O ports and the second UART let designers unlock richer applications without external glue logic.

All STC chips have a pre-installed, non-erasable bootloader. STC publishes its own downloader software (STC-ISP for Windows), and there is also an open-source alternative STCGAL for Linux/macOS. A full memory dump of the flash can be captured with STC-ISP or the open-source STCGAL tool. They are 8051-core derivatives and can be programmed with SDCC (public domain) and a serial interface. Because the tools are open, developers often hack together custom flashing and test workflows around them.