Now, let us diagnose why you might be searching for a "fix."

The CX31993 lacks an internal heat pad on its QFN package. Unlike desktop DACs that dissipate heat via the PCB ground plane, the CX31993 relies entirely on the dongle’s epoxy casing. If the manufacturer used a 2-layer PCB (most cheap dongles do), heat has nowhere to go. The chip thermally throttles at ~85°C, but the plastic case will burn your fingers long before that.

CX31993 Datasheet & Temperature Management: Diagnosing and Fixing a Hot USB-C DAC Conexant (Synaptics) CX31993 Go to product viewer dialog for this item.

The CX31993 is an OEM component intended for device manufacturers, not consumers. Conexant provides the full technical reference manual only under NDA.

If you are working on CRT monitors or power supplies containing this chip, be aware of high voltage risks. Capacitors can hold lethal charges even when unplugged.

According to technical forums discussing DACs with similar architectures, plugging in the dongle after connecting the headphones can help the DAC detect impedance correctly and prevent excessive power draw. 3. Physical Heat Management

🛑 While 65mW is fantastic for IEMs and standard consumer headphones, the standalone CX31993 lacks the raw current and voltage to properly drive hard-to-power equipment. High-impedance headphones (like 150Ω or 300Ω Beyerdynamics) or low-sensitivity planar magnetic headphones will sound thin, bass-shy, and flat.

dongle is operating at uncomfortable temperatures, apply the following fixes to reduce thermal output and improve longevity. 1. Optimize Software Settings (UAPP Fixes)

These exposed wires are notoriously prone to fraying or snapping if shoved into tight pockets. 💡 Pro-Tips for Buying a CX31993 DAC

According to the manufacturer's datasheet specifications, here is how the chip is designed to perform: