{"product_id":"ch341a-ch341b-spi-serial-port-controller-usb-sd-card-interface-ic","title":"CH341A SPI Serial Port Controller – USB \u0026 SD Card Interface IC","description":"\u003ch2\u003eCH341A\/B SPI \u0026amp; Parallel Port Control Interface Chip\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eCH341A \/ CH341B \/ CH374S \/ CH376S \/ CH421A\u003c\/strong\u003e series are versatile USB-to-serial and parallel port control interface chips, perfect for engineers, hobbyists, and developers working with SPI flash programming, USB host control, and SD\/U-disk file management. Made in Mainland China, these ICs deliver reliable performance across a wide range of embedded and development applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Protocol Support:\u003c\/strong\u003e Compatible with SPI, parallel port, and serial port communication interfaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB \u0026amp; SD Card File Management:\u003c\/strong\u003e CH374S and CH376S variants support USB host\/device and SD card file system management for embedded projects\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works with a variety of microcontrollers, development boards, and programming tools\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCH341A\/B:\u003c\/strong\u003e USB to serial\/parallel port bridge chip — ideal for BIOS chip flashing and SPI EEPROM\/Flash programming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCH421A:\u003c\/strong\u003e Advanced USB interface control for embedded system development\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact DIP\/SOP Package:\u003c\/strong\u003e Easy to integrate into breadboards, PCBs, and prototyping setups\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStable \u0026amp; Reliable:\u003c\/strong\u003e Consistent signal integrity for programming and data transfer tasks\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in Mainland China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModels Available:\u003c\/strong\u003e CH341A, CH341B, CH374S, CH376S, CH421A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterface Types:\u003c\/strong\u003e SPI, Parallel Port, Serial Port (UART)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStorage Support:\u003c\/strong\u003e U-Disk (USB Flash Drive) and SD Card file management\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Flash programming, USB host control, embedded file systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Axl\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × CH341A \/ CH341B \/ CH374S \/ CH376S \/ CH421A IC Chip (variant as selected)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the CH341A chip used for?\u003c\/h4\u003e\n\u003cp\u003eA: The CH341A is a USB-to-serial\/parallel port bridge chip commonly used for SPI EEPROM and Flash memory programming, BIOS chip flashing, and interfacing microcontrollers with a PC via USB. It is widely supported by popular programming software tools.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the difference between CH374S and CH376S?\u003c\/h4\u003e\n\u003cp\u003eA: Both the CH374S and CH376S support USB host\/device and SD card file management for embedded systems. The CH376S offers more comprehensive file system support (FAT16\/FAT32) and is often preferred for projects requiring direct SD card or U-disk file read\/write operations from a microcontroller.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these chips compatible with Arduino and other development boards?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The CH341A\/B, CH374S, CH376S, and CH421A chips are broadly compatible with Arduino, STM32, AVR, and other popular microcontroller development platforms via SPI or serial interface connections.\u003c\/p\u003e\n\u003ch4\u003eQ: What package types are these chips available in?\u003c\/h4\u003e\n\u003cp\u003eA: These chips are typically available in DIP (Dual In-line Package) and SOP (Small Outline Package) formats, making them suitable for both breadboard prototyping and PCB soldering applications.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the CH341A chip used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The CH341A is a USB-to-serial\/parallel port bridge chip commonly used for SPI EEPROM and Flash memory programming, BIOS chip flashing, and interfacing microcontrollers with a PC via USB. It is widely supported by popular programming software tools.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between CH374S and CH376S?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Both the CH374S and CH376S support USB host\/device and SD card file management for embedded systems. The CH376S offers more comprehensive file system support (FAT16\/FAT32) and is often preferred for projects requiring direct SD card or U-disk file read\/write operations from a microcontroller.\"}}, {\"@type\": \"Question\", \"name\": \"Are these chips compatible with Arduino and other development boards?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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