
cjiang (Changjiang Microelectronics Tech)
A powerful electrical upgrade with very high current ratings, but requires a much larger PCB footprint.
Finding a substitute for the FXL0650-6R8-M 6.8µH power inductor involves a trade-off between package compatibility and electrical performance. This guide reviews top alternatives and their associated risks.
Using form-fit parts with lower current ratings (e.g., APH0630T6R8M) can lead to overheating or saturation.
Electrically superior parts like FXL0840-6R8-M are in larger packages and require a PCB redesign.
No direct, drop-in replacement with equivalent or better performance has been identified. Alternatives like APH0630T6R8M have the same footprint but lower current ratings, requiring careful review.
For new designs or board revisions, FXL0840-6R8-M is a strong upgrade path, offering better electrical performance in a slightly larger package. No direct drop-in upgrade was found.
The primary risk is either electrical overstress from using a weaker part in the same footprint, or mechanical incompatibility from using a stronger part in a different footprint.

cjiang (Changjiang Microelectronics Tech)
A powerful electrical upgrade with very high current ratings, but requires a much larger PCB footprint.
| Feature / factor | FXL0650-6R8-M | FAUL1050-6R8MT | FXL0840-6R8-M | APH0630T6R8M | Compatibility / risk |
|---|---|---|---|---|---|
| Inductance | 6.8µH | 6.8µH | 6.8µH | 6.8µH | 6.8µH — Inductance matches.; FXL0840-6R8-M: Inductance matches.; APH0630T6R8M: Inductance matches.; FXL0618-6R8-M: Inductance matches. |
| Current | 5.8A | 8.0A | 8.0A | 4.32A | 8.0A / 4.32A / 2.4A — Higher heating current.; FXL0840-6R8-M: Higher heating current provides more margin.; APH0630T6R8M: Lower heating current.; FXL0618-6R8-M: Significantly lower heating current. |
| Saturation Current | 6.3A | 14.0A | 9.0A | 4.98A | 14.0A / 9.0A / 4.98A / 3.6A — Significantly higher saturation current.; FXL0840-6R8-M: Higher saturation current.; APH0630T6R8M: Lower saturation current.; FXL0618-6R8-M: Significantly lower saturation current. |
| Dcr | 41mΩ | 18.5mΩ | 36.8mΩ | 48mΩ | 18.5mΩ / 36.8mΩ / 48mΩ / 110mΩ — Significantly lower DCR improves efficiency.; FXL0840-6R8-M: Lower DCR improves efficiency.; APH0630T6R8M: Slightly higher DCR.; FXL0618-6R8-M: Higher DCR increases power loss. |
| Package | SMD, 7.0x6.6mm | SMD, 11.5x10mm | SMD, 8.8x8.2mm | SMD, 7.0x6.6mm | SMD, 11.5x10mm / SMD, 8.8x8.2mm / SMD, 7.0x6.6mm — Much larger package requires PCB layout change.; FXL0840-6R8-M: Larger package requires PCB layout change.; APH0630T6R8M: Package dimensions match.; FXL0618-6R8-M: Package dimensions match. |
| Qualifications | N/A | AEC-Q200 | - | - | AEC-Q200 — Automotive qualified. |
For a new PCB layout, FXL0840-6R8-M is the best alternative as it offers higher current ratings and lower DCR. If you cannot change the layout, APH0630T6R8M is a potential but weaker substitute that requires careful circuit validation.