The HPAL1V0650-8R2-R datasheet is a concise reference for PCB and power-system engineers: typical inductance 8.2 µH, rated current 5.5 A, saturation behavior near 6–7 A, and typical DCR ≈ 15 mΩ (measured at 25 °C). This article provides a practical, spec-driven guide to electrical specs, footprint/land pattern, and integration tips to accelerate layout, thermal checks, and prototype verification for buck converters and power filters.
Targeted at US power and PCB designers, the content emphasizes measured test conditions (25 °C, 100 kHz where indicated), calculation examples, and actionable footprint recommendations so teams can validate the component on bench and in CAD before committing to production.
1 — Product overview & quick reference (background)
Key part ID & headline specs
| Parameter | Typical / Nominal |
|---|---|
| Part number | HPAL1V0650-8R2-R |
| Inductance | 8.2 µH (0 A, 100 kHz) |
| Rated continuous current | 5.5 A |
| Saturation behavior | Inductance falls by 25% near 6–7 A |
| Typical DCR | ≈ 15 mΩ (25 °C) |
| Package | SMD, 2 pads, nominal height ~6.5 mm |
Recommended operating conditions & common use cases
Use this part where a compact, high-current SMD inductor is required for buck converters or input/output power filters within 5–24 V rails and ambient temperatures −40 to +85 °C. It fits designs where continuous currents approach 4–5 A with margin; consider alternatives if peak currents repeatedly exceed the rated current or if the thermal budget is constrained.
2 — Electrical specifications deep-dive (data analysis)
Inductance vs DC bias & saturation behavior
Inductance at 0 A is 8.2 µH; under DC bias the inductance drops progressively. Designers should read an inductance-vs-current curve to determine usable inductance margin: pick the operating current where inductance remains ≥ 70–80% of the 0 A value for stable control-loop behavior. For margin calculations, use the long-tail keyword metric: HPAL1V0650-8R2-R inductance vs current when documenting test results.
DCR, rated current, ripple current and thermal limits
Typical DCR ~15 mΩ produces I²R loss = I² × DCR. Example: at 4.5 A copper loss = 4.5² × 0.015 = 0.303 W. Include ripple current in loss budgeting: approximate RMS current for triangular ripple Irms ≈ Iout × √(D × (1−D)) for a buck; add Irms²×DCR. Thermal derating: expect ≈10–30% derating above 70 °C—qualify with a thermal test. Verify these electrical specs on the component during prototype testing.
3 — Frequency behavior & reliability data (data analysis)
SRF, core/material implications, and EMI considerations
Self-resonant frequency (SRF) for power inductors of this class typically sits above the switching frequency of common buck converters (100 kHz–1 MHz) but expect high-frequency roll-off above a few MHz. For EMI filtering, measure impedance vs frequency and phase to confirm usable reactive behavior across the intended noise band. If converter switching harmonics approach SRF, add damping or an RC snubber to control peaks.
Thermal performance, soldering & lifecycle notes
Estimate temperature rise from I²R plus core losses; typical rise at rated current is component dependent but designers should validate with thermal imaging. Use standard lead-free reflow profiles with a peak of about 245 °C for ≤10–30 s as a guideline and perform solderability and thermal-cycle testing. Define pass/fail: no mechanical cracking, resistance change <10%, and inductance within spec after cycling.
4 — Footprint, land pattern & PCB integration (methods/guides)
Recommended PCB land pattern and mechanical dimensions
Recommended pad geometry (typical guide): two rectangular pads, pad length 3.0 mm, pad width 1.8 mm, pad-to-pad gap 6.5 mm center-to-center, courtyard clearance 1.0 mm around outline. All units in mm; tolerances ±0.1 mm. Specify solder fillet allowance: 0.2–0.4 mm fillet height. Library maintainers should export CAD at the part nominal outline and include a 0.25 mm solder mask relief around pads.
Layout best practices: thermal, current paths, and assembly
Three actionable layout rules: 1) Route the primary current path with wide traces or pour copper (equivalent to ≥40–50 A•mil for 5 A); 2) Place the inductor close to the switching MOSFET and output capacitor to minimize loop area; 3) Keep sensitive sensing traces away from high di/dt loops. Do: use heavy copper for current paths; Don't: run thin traces under the inductor that carry bulk current. For assembly, orient for stable pick-and-place and ensure pad solderability checks.
5 — Example design scenario & verification checklist (case display + action suggestions)
Example: integrating HPAL1V0650-8R2-R in a 5V buck converter
Design step example: target 5 V output, 5 A peak. Select 8.2 µH for required ripple target; calculate ripple current ΔI = Vout/(L·fsw)·D (estimate ΔI ≈ 0.6–1.2 A at 500 kHz). Loss estimate: I²R at average current 3.5 A → 3.5²×0.015 ≈ 0.184 W. Layout notes: place inductor adjacent to output cap and short loop to switch node. Expected system efficiency impact: a few tenths of a percent depending on switching losses.
Datasheet-to-production checklist
Before prototype, verify: 1) electrical specs match application (inductance, DCR, rated current), 2) footprint matches CAD library and pick-and-place geometry, 3) order samples and perform inductance-vs-current and thermal rise tests, 4) run 3–5 reflow cycles and thermal cycling, 5) sign-off when losses, temperature rise, and mechanical integrity meet criteria. Confirm the HPAL1V0650-8R2-R datasheet during the final sign-off step on the bench.
Summary
- The HPAL1V0650-8R2-R delivers ~8.2 µH with ~5.5 A rated current and ~15 mΩ DCR; confirm inductance-vs-current for control-loop margin and thermal headroom when designing buck converters.
- Electrical specs and loss budgeting (I²R + ripple-related RMS) determine temperature rise—perform bench verification at operating ambient and worst-case ripple.
- Follow the recommended footprint dimensions in CAD, prioritize short high-current loops and wide copper traces, and validate with reflow and thermal-cycle tests before production.
Next step: validate inductance-vs-current on the bench and confirm the recommended footprint in CAD before ordering prototypes; reference the HPAL1V0650-8R2-R datasheet for final verification on tolerances and testing conditions.
Frequently Asked Questions
What test conditions should be used to confirm HPAL1V0650-8R2-R datasheet inductance?
Measure inductance at 25 °C using a calibrated LCR meter at 100 kHz (or the specified frequency) with 0 A DC bias for the 0 A baseline, then sweep DC bias to map inductance vs current. Record DCR at 25 °C and repeat after thermal soak to capture real-world behavior. Document setup, probe method, and fixture to ensure repeatability.
How to calculate loss from the electrical specs in the HPAL1V0650-8R2-R datasheet?
Use I²R for copper loss: P_cu = I_rms² × DCR. Include ripple RMS current contribution for switching applications. Add estimated core loss from manufacturer curves or measured impedance vs frequency. Example: 4.5 A through 15 mΩ → 0.303 W copper loss; add core loss measured at switching frequency for total loss estimate.
What footprint checks should be done against the HPAL1V0650-8R2-R footprint land pattern?
Confirm pad dimensions, pad-to-pad spacing, and courtyard in CAD; verify pick-and-place pin centroid and stencil aperture for consistent solder paste deposition. Run a 3D assembly check for height clearance and perform a first-article reflow to verify solder fillets and placement accuracy before larger runs.
What is the continuous current and saturation current profile of this inductor?
The HPAL1V0650-8R2-R features a rated continuous current of 5.5 A, with saturation behavior taking place near 6–7 A, causing the nominal 8.2 µH inductance to fall by approximately 25%.
