SWPA4018S3R3MT
Sunlord
Needs validationmedium risk
Same package and key ratings, but has higher DC resistance (DCR), leading to increased power loss.
Best Alternatives to SPH4018H3R3MT
SPH4018H3R3MT is a 3.3µH, 2.9A power inductor in a 4x4x1.8mm package. Alternatives exist with trade-offs in DC resistance, current ratings, and package height, requiring careful review for specific applications.
AI replacement insight
Electrical riskmedium
Candidates have trade-offs in DCR, Isat, or temperature range.
Package riskhigh
Several candidates have different package heights, requiring mechanical verification.
Sourcing risklow
Alternatives are available from multiple manufacturers.
Can it be replaced directly?
There are no direct, drop-in replacements without trade-offs. Candidates in the same package have weaker electrical performance in at least one key parameter (DCR or Isat).
Best replacement path
For form-factor priority, review SWPA4018S3R3MT (higher DCR) or NRS4018T3R3MDGJ (lower Isat). For electrical performance, consider SMNR4030-3R3MT if the taller package is acceptable.
Main risk
The main risk is performance degradation from either higher DCR (power loss) or lower saturation current (circuit instability).
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | SPH4018H3R3MT | SWPA4018S3R3MT | NRS4018T3R3MDGJ | SMNR4030-3R3MT | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 4018 | 4018 | 4018 | 4030 | 4018 / 4030 / 4020 — Same 4.0x4.0x1.8mm package.; NRS4018T3R3MDGJ: Same 4.0x4.0x1.8mm package.; SMNR4030-3R3MT: Much taller package (3.0mm vs 1.8mm).; SWPA4020S3R3MT: Taller package (2.0mm vs 1.8mm). |
| Inductance | 3.3µH | 3.3µH | - | - | 3.3µH — matched; SWPA4020S3R3MT: matched |
| Saturation Current A | 2.9A | 2.9A | 2.3A | 3.3A | 2.9A / 2.3A / 3.3A / 3.2A — matched; NRS4018T3R3MDGJ: Lower Isat may cause inductance drop.; SMNR4030-3R3MT: Higher Isat is an improvement.; SWPA4020S3R3MT: Higher Isat is an improvement. |
| Dcr Ohm | 0.055Ω | 0.091Ω | 0.055Ω | 0.04Ω | 0.091Ω / 0.055Ω / 0.04Ω / 0.07Ω — Higher DCR increases power loss.; NRS4018T3R3MDGJ: matched; SMNR4030-3R3MT: Lower DCR is an improvement.; SWPA4020S3R3MT: Higher DCR increases power loss. |
| Current A | ~2.5A | Not specified | - | 2.4A | Not specified / 2.4A — RMS current rating must be verified.; SMNR4030-3R3MT: RMS current is slightly lower. |
| Temperature | -40°C to +125°C | - | -25°C to +125°C | - | -25°C to +125°C — Narrower operating range. |
Application & sourcing insights
Questions & answers
No single best alternative exists. SWPA4018S3R3MT shares the same package but has higher DCR. NRS4018T3R3MDGJ has lower saturation current. Others offer better electricals but in larger packages. The best choice depends on your design's priorities.