Ch341a V 118 _hot_ Jun 2026

Locate the small indented dot or groove on your BIOS chip. This represents Pin 1.

The 20-pin ZIF socket is wired to match the standard SPI pinout used in most desktop motherboard BIOS chips (Winbond, Macronix, Gigadevice). The CH341A v1.18 typically adds breakout headers next to the ZIF socket, labeled: ch341a v 118

The heart of the CH341A v1.18 is its 16-pin ZIF socket. The socket is divided into two distinct zones to accommodate different chip families. When looking at the board with the USB connector facing away from you (or referencing the graphic printed directly on the PCB), the socket behaves as follows: 1. The 24 Series Zone (I2C EEPROMs) Used for chips like the 24C02, 24C04, up to 24C512. Locate the small indented dot or groove on your BIOS chip