WCH (Nanjing Qinheng Microelectronics) MPN encoding patterns, suffix decoding, and handler guidance. Use when working with WCH RISC-V MCUs, USB interface chips, or WCHHandler.
WCH has two main product categories with different structures:
CH32[CORE][SERIES][PIN][FLASH][PKG][TEMP]
│ │ │ │ │ │ │
│ │ │ │ │ │ └── Temperature (6=industrial)
│ │ │ │ │ └── Package type (T=LQFP, U=QFN)
│ │ │ │ └── Flash size (4=16KB, 8=64KB, B=128KB, C=256KB)
│ │ │ └── Pin code (C=48, R=64, V=100)
│ │ └── Series (003=entry, 103=standard, 203=enhanced, 30x=high-perf)
│ └── Core (V=RISC-V, F=ARM Cortex-M3)
└── CH32 prefix
CH[SERIES][VARIANT]
│ │ │
│ │ └── Package variant (G=SOP-16, C=SOP-16 w/crystal, K=ESSOP-10)
│ └── Series (340=USB-UART, 341=USB-Multi, 9340=Enhanced)
└── CH prefix
CH32V103C8T6
│ │ │ │││
│ │ │ ││└── Temp 6 (industrial)
│ │ │ │└── Package T (LQFP)
│ │ │ └── Flash 8 (64KB)
│ │ └── Pin C (48-pin)
│ └── Series 103 (QingKe V3A core)
└── Core V (RISC-V)
CH340G
│ │ │
│ │ └── Package G (SOP-16)
│ └── Series 340 (USB to UART)
└── CH prefix
| Code | Package | Pin Count |
|---|---|---|
| A | QFN-28 | 28 |
| C | LQFP-48 | 48 |
| F | TSSOP-20 | 20 |
| G | QFN-20 | 20 |
| J | SOP-20 | 20 |
| K | ESSOP-20 | 20 |
| N | SOP-8 | 8 |
| R | LQFP-64 | 64 |
| U | QFN-20 | 20 |
| V | LQFP-100 | 100 |
| W | QFN-28 | 28 |
| Suffix | Package |
|---|---|
| G | SOP-16 |
| C | SOP-16 (integrated crystal) |
| K | ESSOP-10 |
| N | SOP-8 |
| E | MSOP-10 |
| X | ESSOP-10 |
| T | SSOP-20 |
| A | SOP-28 |
| B | SSOP-28 |
| S | SOP-28 |
| H | SOP-28 |
| L | LQFP-48 |
| Series | Core | Clock | Features |
|---|---|---|---|
| CH32V003 | QingKe V2A | 48MHz | Entry-level, 2KB SRAM |
| CH32V103 | QingKe V3A | 80MHz | Standard, 20KB SRAM |
| CH32V203 | QingKe V4B | 144MHz | Enhanced, 64KB SRAM |
| CH32V208 | QingKe V4C | 144MHz | Bluetooth LE support |
| CH32V303 | QingKe V4F | 144MHz | High-performance |
| CH32V305 | QingKe V4F | 144MHz | USB HS, Ethernet |
| CH32V307 | QingKe V4F | 144MHz | USB HS, Ethernet, CAN |
| Series | Core | Clock | Features |
|---|---|---|---|
| CH32F103 | Cortex-M3 | 72MHz | STM32F103 compatible |
| CH32F203 | Cortex-M3 | 144MHz | Enhanced peripherals |
| Series | Type | Features |
|---|---|---|
| CH340 | USB-UART | Most popular, no crystal needed (CH340C) |
| CH341 | USB-Multi | UART/I2C/SPI/Parallel |
| CH9340 | USB-UART | Enhanced CH340 |
| CH342-CH348 | USB-UART | Various channel counts |
| Series | Type | Features |
|---|---|---|
| CH395 | Ethernet | 10/100M Ethernet controller |
| CH9121 | ETH-UART | Ethernet to serial |
| CH9141 | BLE-UART | Bluetooth LE module |
| CH9143 | BLE-UART | Bluetooth LE module |
| CH334 | USB Hub | USB hub controller |
| CH224 | USB PD | Power Delivery controller |
| CH552/554/559 | 8051 USB | 8051-based USB MCUs |
| Code | Flash Size |
|---|---|
| 4 | 16KB |
| 6 | 32KB |
| 8 | 64KB |
| B | 128KB |
| C | 256KB |
| D | 384KB |
| E | 512KB |
| G | 1024KB |
// MCU format: CH32V103C8T6
// Position: 01234567890123
// ^-- position 8 is pin code 'C'
char pinCode = mpn.charAt(8);
String packageType = MCU_PACKAGE_CODES.get(pinCode);
// Pin count also at position 8
Integer pinCount = MCU_PIN_COUNTS.get(pinCode);
// CH340G -> G = SOP-16
// Last character is package code
String suffix = mpn.substring(mpn.length() - 1);
String pkg = USB_PACKAGE_CODES.get(suffix);
// CH340 without suffix defaults to SOP-16
if (mpn.matches("^CH(340|341|9340)$")) {
return "SOP-16"; // Default package
}
The handler provides getCoreType() for MCUs:
| Series | Core Type |
|---|---|
| CH32V003 | RISC-V QingKe V2A |
| CH32V103 | RISC-V QingKe V3A |
| CH32V203/208 | RISC-V QingKe V4B |
| CH32V303/305/307 | RISC-V QingKe V4F |
| CH32F103/203 | ARM Cortex-M3 |
| CH552/554/559 | 8051 Enhanced |
The handler provides getInterfaceType() for interface chips:
| Series | Interface Type |
|---|---|
| CH340, CH9340 | USB to UART |
| CH341 | USB to UART/I2C/SPI/Parallel |
| CH348 | USB to 8x UART |
| CH395 | Ethernet Controller |
| CH9121 | Ethernet to UART |
| CH9141/9143 | BLE to UART |
| CH334 | USB Hub Controller |
| CH224 | USB PD Controller |
manufacturers/WCHHandler.javaMICROCONTROLLER, ICThe CH340C has an integrated crystal oscillator:
Both are SOP-16 package and pin-compatible.
CH32F103 series is designed as a drop-in replacement for STM32F103: