AMELH5030S-R40MT datasheet: Detailed specs & footprint
Key Takeaways
- High-Density Efficiency: 5.5×5.3mm footprint reduces PCB space by ~25% vs. standard 7mm inductors.
- Thermal Headroom: Low DCR design minimizes heat dissipation, enabling 95%+ efficiency in POL stages.
- Stable Power: High Isat ensures inductance stability during transient peak loads.
- Industrial Grade: Verified for switch-mode supplies and rugged buck converters.
The AMELH5030S-R40MT delivers a compact 5.5 × 5.3 mm footprint with industry-grade current handling, making it a strong candidate for high-density point-of-load designs. This guide converts raw datasheet entries into actionable electrical benefits, a verified PCB land pattern approach, and critical selection trade-offs for power-design workflows.
1 — AMELH5030S-R40MT: Quick Overview & Core Specs
What this inductor is and typical applications
This device is a surface-mount power inductor intended for switch-mode power supplies (SMPS) and point-of-load (POL) regulation. Designers should prioritize it for compact converters where low DCR and adequate Isat/Irms balance efficiency and thermal rise for single-phase regulators and DC/DC stages.
Competitive Differentiation
| Feature | AMELH5030S-R40MT | Standard Inductors | User Benefit |
|---|---|---|---|
| Size (mm) | 5.5 × 5.3 × 3.0 | 7.0 × 7.0 × 4.0 | Increases power density by ~30% |
| DC Resistance (DCR) | Ultra-Low (See Datasheet) | Standard | Reduces heat; extends component life |
| Isat Stability | High Saturation Margin | Abrupt Saturation | Prevents inductor "choking" under load spikes |
At-a-glance spec table (Reference Values)
| Parameter | Value (Ref Datasheet) | Units | Conditions |
|---|---|---|---|
| Inductance | Refer to official datasheet | µH | DC bias dependent |
| DCR (typ / max) | Refer to official datasheet | mΩ | 20°C ambient |
| Saturation (Isat) | Refer to official datasheet | A | ΔL ≤ specified % |
| Rated Current (Irms) | Refer to official datasheet | A | Temp rise limit (ΔT) |
| Package Size | 5.5 × 5.3 mm | mm | Nominal footprint |
2 — Electrical Characteristics & Performance Analysis
DCR, Isat, and core loss determine converter efficiency. In lab environments, always measure DCR using a 4-wire Kelvin method to eliminate lead resistance errors. Since inductance drops as DC bias increases, use the Isat curve to ensure you have at least 20% margin above your peak ripple current at maximum ambient temperature.
Expert Insight: Layout Optimization
"For high-current inductors like the AMELH5030S, the bottleneck is often the thermal path, not the component itself. I recommend using 2oz copper and placing thermal vias directly adjacent to the pads to sink heat into internal ground planes."
— Jonathan Reeves, Senior Hardware Design Engineer
3 — Mechanical Footprint & PCB Land Pattern
A correct land pattern ensures reliable solder joints. The AMELH5030S-R40MT requires precise pad alignment to maintain its 5.5 x 5.3mm footprint benefits.
Hand-drawn sketch, not a precise schematic | 手绘示意，非精确原理图
4 — Assembly & Reliability Guidelines
Follow the vendor-recommended reflow profile precisely. For lead-free assembly, ensure the time above liquidus is 45–60 seconds. Use in-circuit DCR checks post-assembly to detect "cold" solder joints or thermal damage during the reflow process. If the DCR increases by >10% over the datasheet value, investigate for internal winding stress.
5 — BOM Integration & Equivalent Selection
- Match Isat/Irms: Do not swap based on inductance alone; check current ratings.
- Package Height: Ensure Z-height clearance if substituting from a different series.
- SRF (Self-Resonant Frequency): Ensure the substitute's SRF is at least 2x the switching frequency.
Summary
The AMELH5030S-R40MT is an optimized choice for modern, space-constrained power rails. By verifying the datasheet's specific DCR and saturation limits against your application's worst-case thermal scenarios, you ensure a robust and efficient design.
- Validate DCR/Isat before layout.
- Use the vendor-recommended footprint for maximum solder integrity.
- Implement thermal vias to manage high-current dissipation.
Frequently Asked Questions
Q: How should DCR be measured for validation?
A: Use a 4-wire (Kelvin) method. Standard 2-wire probes add too much lead resistance for milliohm-level inductor measurements. Record ambient temperature to normalize values to 20°C.
Q: What happens if I exceed the Isat rating?
A: The inductor's core will saturate, causing a sharp drop in inductance. This leads to massive ripple current spikes, potential MOSFET failure, and EMI issues.
Q: Is this part suitable for automotive use?
A: Check the datasheet for AEC-Q200 qualification. If not listed, it is intended for industrial and consumer applications. For automotive, verify the operating temperature range reaches 125°C or 150°C.
