CH341A USB EEPROM Flash BIOS Programmer with SOP8 Test Clip - 24/25/93 Series

The CH341A programmer is a low-cost USB-powered universal programmer supporting 24xx I2C EEPROM, 25xx SPI NOR flash, and 93xx Microwire EEPROM chip families. Bundled with a SOP8/SOIC8 test clip for in-circuit programming, it is the most popular tool for BIOS recovery, router firmware flashing, and EEPROM read/write operations.

Key Specifications

Parameter	Value
Programmer IC	CH341A (WCH)
Interface	USB 2.0 (recognized as USB-Serial device)
Supported Protocols	I2C (24xx), SPI (25xx), Microwire (93xx)
Chip Voltage	3.3V and 5V (switch selectable on some versions)
ZIF Socket	DIP-8 ZIF socket (for through-hole chips)
Test Clip	SOP8/SOIC8 clip with ribbon cable
OS Support	Windows (AsProgrammer, NeoProgrammer, CH341A software)

Supported Chip Families

Protocol	Series	Common Chips
SPI NOR Flash	25xx	W25Q32/64/128, MX25L3206, GD25Q64 (BIOS, router)
I2C EEPROM	24xx	AT24C02/04/08/256 (ECU, appliance, TV settings)
Microwire EEPROM	93xx	93C46/56/66 (automotive, set-top box)

Why Choose CH341A Programmer?

SOP8 Clip Included - Program chips in-circuit without desoldering
Wide Chip Support - Covers most common BIOS, EEPROM, and SPI flash chips
USB Powered - No external power supply needed
Free Software - AsProgrammer and NeoProgrammer are free, open-source
DIP-8 ZIF Socket - Also programs through-hole DIP-8 chips directly

Typical Applications

Laptop/desktop BIOS recovery (corrupt or password-locked BIOS)
Router and modem firmware backup and flashing
EEPROM data backup and cloning (ECU, TV, appliance)
SPI flash chip reading for firmware analysis
93C46 EEPROM programming (odometer, key fob)

Software Setup

Install CH341A driver (CH341SER.INF). Use AsProgrammer (open-source, recommended) or NeoProgrammer. Select chip family (25xx for SPI flash), auto-detect or manually select chip model. Read, erase, program, and verify operations supported.

FAQ

Q: Can CH341A program 3.3V chips safely? The standard CH341A outputs 5V on the SPI lines, which can damage 3.3V-only chips (W25Q series). Modify the programmer by replacing the 3.3V regulator output to the chip socket, or use a CH341A with built-in 3.3V/5V switch.

Q: What software works best with CH341A? AsProgrammer is recommended - free, open-source, supports the widest range of chips, and is actively maintained.