Koshin (Dongjia) Capacitors Found in Baseus 140W PD 3.1 Four-Port GaN Charger — Covering HV Input and LV Output Filtering
2026-09-01 · Compiled by Best IT Parts from public industry reporting
A teardown by Capacitor World shows that Baseus' 140W 3C1A four-port GaN charger E0120K uses multiple Koshin (Dongjia) capacitors across both the primary-side high-voltage filtering and secondary-side synchronous rectification output filtering stages. The charger pairs two USB-C ports with USB PD 3.1 support delivering up to 28V 5A (140W) with a USB-C/USB-A combo rated at 30W, powering laptops, tablets, and phones simultaneously. On the input side, a 400V 27µF electrolytic capacitor filters the rectified DC bus and suppresses ripple; on the output side, two 35V 470µF solid-state capacitors filter the synchronous rectifier output, providing a stable bus for downstream multi-port power conversion and distribution under PD 3.1's 28V output. For passive component distributors, charger OEMs, and B2B buyers tracking component design wins, the finding demonstrates Koshin's complete high- and low-voltage filtering coverage inside a high-power-density GaN fast charger.
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