NCP6335 (Marking 63 / 63QS) Buck Converter IC

Technical Specifications: Original Service Part (ORG) manufactured by ON Semiconductor.

• Base Part Number: NCP6335 (NCP6335DFCT1G).

• Marking Code: 63xx (e.g., 63QS, 63HK, 63HL).

• Type: Synchronous Buck Converter.

• Function: Provides stable, high-current voltage (up to 4A) to the Processor (CPU) or GPU rails.

Common Fixes:

1. Dead Set: Critical for powering the CPU. Failure results in a dead phone with low constant current draw.

2. Overheating: Internal short causes massive heat near the CPU area immediately after connecting power.

3. Restarting: Device restarts under heavy load due to voltage drops.

Compatibility: Widely used in Exynos-based Samsung flagship devices:

• Samsung Galaxy S7 / S7 Edge (G930 / G935).

• Samsung Galaxy S8 / S8+ (G950 / G955).

• Samsung Galaxy Note 8 (N950).

Technician Note: Important: This IC is identified by the number “63”. The letters following it (like QS, HK, KJ) are batch/date codes. They are all NCP6335 and are 100% interchangeable.