Cx31993 Datasheet Fix Hot

Have you successfully fixed a hot CX31993 dongle? Share your mod in the comments below.

However, a widespread issue has plagued users across Amazon, Reddit, and AliExpress: cx31993 datasheet fix hot

This article serves as both a deep-dive into the missing CX31993 datasheet (which Conexant no longer publicly provides) and a hands-on guide to fixing the thermal runaway. If you search for the official "CX31993 datasheet" on the Conexant (now part of Synaptics) website, you will hit a wall. The public documentation for this chip is sparse. Most available "datasheets" are simply marketing briefs or pinout diagrams scraped from Chinese OEM forums. Have you successfully fixed a hot CX31993 dongle

| Condition | Datasheet Spec | Defective Dongle | Fixed Dongle | | :--- | :--- | :--- | :--- | | Idle current (no playback) | <10 mA | 35-50 mA | 12-18 mA | | Load current (1kHz sine @ 0dB) | <80 mA | 150-200 mA | 85-95 mA | | Case temperature (30 min) | <45°C | 65-85°C | 41-48°C | If you search for the official "CX31993 datasheet"

Most $3 dongles from AliExpress skip this. They use a 2-layer PCB with no thermal vias. The EPAD is either unsoldered or attached to a tiny copper island. Without thermal conductivity, the chip surface reaches 85°C in 2 minutes. Cause #3: USB 5V Direct Rail (No DC-DC Converter) The CX31993 ideally runs on 3.3V. A proper design uses a DC-DC buck converter (e.g., 5V→3.3V @ 85% efficiency). However, ultra-cheap dongles use a linear LDO to drop 5V to 3.3V.