
Samsung Electro-Mechanics
A strong alternative from Samsung with identical key electrical specs and package.
Finding a substitute for the FN18X104K500GBG 100nF 50V 0603 capacitor is straightforward due to its common specification. Key is to match the 0603 package, 100nF capacitance, and X7R dielectric, while ensuring any alternative has a voltage rating of 50V or higher.
Using a part with voltage < 50V can lead to immediate failure.
The 0603 package is standardized, making physical fit straightforward.
This is a very common capacitor value with many manufacturers.
Yes, several direct replacements exist. CL10B104KB8NFNC from Samsung is an ideal candidate, matching the 100nF capacitance, 50V rating, ±10% tolerance, and 0603 package.
Upgrade to a 100V-rated part like HMK107B7104KAHT for a wider safety margin, or use CL10B104KB8NFNC for a direct parametric match.
The primary risk is using a substitute with a lower voltage rating or a wider tolerance (e.g., ±20%) without verifying its suitability for the specific circuit application.

Samsung Electro-Mechanics
A strong alternative from Samsung with identical key electrical specs and package.
| Feature / factor | FN18X104K500GBG | CL10B104KB8NFNC | HMK107B7104KAHT | TCC0603X7R104J500CT | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 0603 | 0603 (1608 Metric) | 0603 (1608 metric) | 0603 (1608 Metric) | 0603 (1608 Metric) / 0603 (1608 metric) — Package size matches, enabling drop-in replacement.; HMK107B7104KAHT: Package size matches.; TCC0603X7R104J500CT: Package size matches.; FCC0603B104K101CT: Package size matches. |
| Voltage | 50V | 50V | 100V | 50V | 50V / 100V — Voltage rating matches the target's requirement.; HMK107B7104KAHT: Higher voltage rating provides increased design margin.; TCC0603X7R104J500CT: Voltage rating matches.; FCC0603B104K101CT: Higher voltage rating provides increased design margin. |
| Capacitance | 100nF | 100nF | - | - | 100nF — Capacitance value is identical. |
| Tolerance | ±10% | ±10% | ±10% | ±5% | ±10% / ±5% — Tolerance matches the original part.; HMK107B7104KAHT: Tolerance matches.; TCC0603X7R104J500CT: Tighter tolerance provides a performance upgrade.; FCC0603B104K101CT: Tolerance matches. |
| Dielectric | X7R | X7R | - | X7R | X7R — Dielectric material is the same, ensuring similar temperature characteristics.; TCC0603X7R104J500CT: Dielectric material is the same. |
| Application | General | - | Yes | - | Yes — AEC-Q200 qualification is an upgrade for reliability. |
The best alternative depends on your priority. For a direct match, CL10B104KB8NFNC is ideal. For higher reliability and a greater safety margin, an AEC-Q200 qualified, 100V-rated part like HMK107B7104KAHT is an excellent upgrade.