U2irda Mini 4 Mbps Fir Usb Irda 20
The U2IrDA Mini 4 Mbps FIR USB IrDA 20 remains a functional, low-cost bridge for maintaining legacy IrDA communication. While its 4 Mbps FIR capability is adequate for small file transfers and terminal access, modern users must contend with driver obsolescence and physical alignment constraints. Future revisions could adopt USB-C and improved transceivers for longer range, but the decline of IrDA makes this unlikely.
As of 2026, Windows 10 IoT Enterprise LTSC 2021 still includes the legacy IrDA stack (disabled but present). However, Windows 12’s rumored removal of all 32-bit driver support could kill this dongle on Microsoft platforms forever. That said, Linux’s commit to legacy hardware and the retro computing community’s dedication mean this dongle will remain usable for at least another decade. Industrial users will simply dedicate a Windows 7 thin client to the task.
| Feature | Specification | |-----------------------|------------------------------------| | Form factor | USB Type-A mini dongle | | IrDA standard | IrDA 1.1 (FIR up to 4 Mbps) | | Supported speeds | 9.6 kbps, 19.2 kbps, 115.2 kbps, 576 kbps, 1.152 Mbps, 4 Mbps | | Transceiver | 875 nm IR LED + PIN photodiode | | Maximum range | 0.2–1.0 m (depending on angle) | | Host interface | USB 1.1/2.0 full speed (12 Mbps) | | Power | Bus-powered (< 100 mA) | | Chipset | SigmaTel STir4200 or equivalent | U2IrDA Mini 4 MBPS FIR USB IrDA 20
The device includes a plastic window with IR filtering, typically colored dark red/black. It is marketed under names like “U2IrDA Mini” or “USB IrDA 20” by various Chinese OEMs.
To truly understand the value of the U2IrDA Mini 4 MBPS FIR USB IrDA 20, one must examine its compliance and performance metrics. The U2IrDA Mini 4 Mbps FIR USB IrDA
| Specification | Detail | |---------------|---------| | Standard | IrDA 1.4 (FIR) | | Data Rate | 9.6 kbps, 19.2 kbps, 38.4 kbps, 57.6 kbps, 115.2 kbps (SIR), 576 kbps, 1.152 Mbps (MIR), 4 Mbps (FIR) | | Interface | USB 2.0 / 1.1 Full Speed | | Range | 0 to 1 meter (optimal at 20–50 cm) | | Angle | Cone of ±15° to ±30° (depending on transceiver quality) | | Power | Bus-powered (5V DC, <50 mA) | | OS Support | Windows 2000, XP, Vista, 7, 8, 10 (32/64-bit), some Linux kernels | | Chipset | Typically SigmaTel STIR4200 or Infineon (obsolete but functional) |
The U2IrDA Mini acts as a transparent bridge. When plugged into a PC, the operating system detects a standard IrDA device. You can then use standard "Wireless Link" features (in Windows) or third-party terminal software to communicate with target devices. Despite its age, IrDA offers distinct advantages over
Despite its age, IrDA offers distinct advantages over wireless alternatives for specific tasks:
Primary uses:
Limitations:
Solution: Fluorescent lights (especially older tube lights) emit IR interference. Move to a dimly lit room or block ambient IR with a cardboard shield. Also, check for USB power saving: Go to Device Manager → USB Root Hub → Properties → Power Management → Uncheck "Allow the computer to turn off this device."