FP1507R1-R185-R - 185nH 45A Shielded Power Inductor | Eaton
MPN: FP1507R1-R185-R ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
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FP1507R1-R185-R Overview
Power inductors are passive energy-storage components that smooth current ripple in switching regulators, store energy in flyback or SEPIC topologies, and filter EMI in power lines. They sit in the broader hierarchy of passive components, alongside capacitors and resistors, but specifically serve the role of accumulating energy in a magnetic field (E = 0.5 * L * I^2) and releasing it to the load. Within a DC-DC converter, the inductor is the principal energy-transfer element in buck, boost, and buck-boost topologies, and its inductance value, saturation current rating, and DC resistance jointly determine efficiency, ripple amplitude, and thermal performance. The Flat-Pac FP1507R family specifically targets point-of-load converters where footprint, low profile, and very low DCR are all critical.
Key features include a 185 nH nominal inductance at 1 MHz test frequency, an unusually high 45 A rated saturation current, and a low 0.52 mOhm DCR. The shielded drum-core construction reduces stray magnetic flux, lowering radiated EMI and allowing adjacent placement of nearby components. RoHS compliance is built into the part number suffix (-R), and a Hi-Pot rating of 250 VDC minimum for 2 seconds at 1.0 mA (conductor to core) provides isolation assurance in safety-critical designs.
The dual-conductor flat-wire winding keeps skin-effect and proximity-effect losses low at high switching frequencies, making the FP1507R1-R185-R well suited to multi-MHz buck regulators where conventional round-wire inductors would see significant AC losses. The composite core material allows saturation behavior that is softer than ferrite-only designs, easing transient current spikes in VRM output filters.
Typical applications include CPU/GPU VRM output filters, server and data-center POL converters, 48 V-to-PoL intermediate bus converters, industrial DC-DC bricks, and high-current FPGA power rails. Its 45 A rating covers most single-phase and many multiphase VRM outputs.
When laying out the PCB, ensure the exposed solder pads of the Flat-Pac footprint are fully wetted and that the land pattern matches the Eaton FP1507R datasheet recommendations. The magnetic field is largely contained by the shield, but high-current return paths should still be kept short.
This page synthesizes real-time distributor pricing, verified electrical specifications, drop-in replacement candidates, and PCB-level design notes that are not aggregated on the manufacturer datasheet alone.
Drop-in alternatives for FP1507R1-R185-R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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FP1507R1-R30-R
✅ Drop-In📋 Reference alternative (not in catalog)
FP1507R1-R100-R
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
FP1507R1-R250-R
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
FP1507R2-R185-R
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
FP1507R1-R185-R
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View Datasheet →FP1507R1-R185-R Maximum Ratings & Electrical Characteristics
| Inductance | 185 nH (nominal) |
| Saturation Current (Isat) | 45 A |
| DC Resistance (DCR) | 0.52 mOhm (typical) |
| Test Frequency | 1 MHz (typical) |
| Construction | Shielded drum core, wirewound (dual flat conductors) |
| Package | Flat-Pac FP1507R (SMD) |
| Package Code | Nonstandard (Flat-Pac footprint) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (-R suffix) |
| Hi-Pot Rating | 250 VDC min, 2 s, 1.0 mA (conductor to core) |
FP1507R1-R185-R nonstandard (flat-pac footprint) Pin Configuration Guide
Pin configuration for FP1507R1-R185-R (nonstandard (flat-pac footprint) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for FP1507R1-R185-R.
Refer to the datasheet for full pin configuration.
Typical Applications
FP1507R1-R185-R is suitable for 7 applications: CPU/GPU VRM Output Filter, Server and Data-Center POL Converters, 48 V-to-POL Intermediate Bus Converters, Industrial DC-DC Brick Modules, High-Current FPGA Power Rails, High-Frequency Synchronous Buck Regulators, Telecom Base Station Power Modules.
CPU/GPU VRM Output Filter
The FP1507R1-R185-R's 185 nH inductance and 45 A saturation current make it well-suited for the output filter inductor in a multiphase CPU or GPU voltage regulator module (VRM). The 0.52 mOhm typical DCR keeps per-phase conduction losses around 0.47 W at 30 A, preserving efficiency and limiting thermal rise on the PCB. Placed between the high-side/low-side FETs and the output capacitor bank in a buck topology, the Flat-Pac footprint fits next to smart power stages in dense motherboard layouts. The shielded drum core reduces radiated magnetic field that could couple into adjacent memory circuits, which is critical when the inductor sits within centimeters of DDR5 lanes.
Recommended
Server and Data-Center POL Converters
Server motherboards and data-center accelerator cards require many point-of-load (POL) converters stepping down 12 V or 48 V to 0.8-3.3 V rails, each needing an inductor with very low DCR and high saturation current. The FP1507R1-R185-R provides 45 A current handling in the FP1507R surface-mount footprint that accepts the standard POL land pattern, supporting high-power CPU cores, AI accelerator ASICs, and DDR memory termination regulators. At 45 A saturation the inductor saturates well above the steady-state load of most POLs, preserving inductance under load transients that exceed DC current. Designers can parallel two FP1507R1-R185-R inductors for >90 A capability when powering AI accelerator cores.
Recommended
48 V-to-POL Intermediate Bus Converters
Intermediate bus architectures use a 48 V-to-12 V or 48 V-to-5 V first stage feeding downstream POL regulators; the FP1507R1-R185-R can serve as the energy-storage inductor in either stage. Its 45 A saturation and very low DCR support the high RMS currents seen in fixed-ratio or regulated bus converters operating at 500 kHz to 1 MHz switching frequency. The dual flat-conductor winding keeps AC winding losses low at these frequencies, where round-wire windings would suffer from skin and proximity effects. The Flat-Pac low profile is valuable on tall, card-edge bus converter modules where vertical clearance is constrained.
Recommended
Industrial DC-DC Brick Modules
Quarter-brick and eighth-brick DC-DC converter modules used in industrial and telecom equipment require robust inductors that handle 20-40 A continuous load with low DCR. The FP1507R1-R185-R fits the Flat-Pac FP1507R footprint used inside the industry-standard brick outline, where its shielded drum core contains the magnetic field within the brick housing. The 250 VDC Hi-Pot rating between conductor and core provides the isolation margin required for telecom bus converters and ruggedized industrial supplies that must pass surge withstand and hipot testing per IEC 62368-1. The 0.52 mOhm DCR helps brick modules achieve >96% efficiency at full load.
Recommended
High-Current FPGA Power Rails
Modern FPGAs with transceivers and DSP blocks draw 15-30 A on core rails (VCCINT, VCCBRAM) and 3-10 A on auxiliary rails; the FP1507R1-R185-R's 45 A saturation gives designers headroom for load transients that can spike to 2-3x the steady-state current. The 185 nH inductance is appropriate for switching frequencies around 500 kHz to 1 MHz used in most FPGA power reference designs. Shielded construction prevents the magnetic field from coupling into the FPGA's high-speed SerDes channels, which would otherwise degrade jitter and eye-diagram margins. The 0.52 mOhm DCR keeps copper losses below 1 W per phase at typical FPGA core currents.
Recommended
High-Frequency Synchronous Buck Regulators
At switching frequencies of 1 MHz and above, AC winding losses in conventional round-wire inductors dominate efficiency loss budgets and cause inductor self-heating. The FP1507R1-R185-R uses dual flat-conductor windings that minimize skin and proximity effects at these frequencies, holding total winding losses low even when the converter switches at multi-MHz rates. Its 185 nH inductance supports ripple targets of 10-20% at 1 MHz with a typical 15-30 A load, fitting most point-of-load regulator designs. The Flat-Pac SMD footprint allows reflow assembly on standard SMT lines without the through-hole or hand-soldering required for toroidal high-current inductors.
Recommended
Telecom Base Station Power Modules
4G and 5G base-station power units need power inductors with high current capability and low DCR to meet efficiency targets set by telecommunications network operators. The FP1507R1-R185-R provides 45 A saturation in the FP1507R surface-mount package, supporting 12 V, 24 V, and 48 V intermediate bus converters used inside remote radio heads and baseband units. The shielded drum-core construction keeps the magnetic field inside the inductor body, which is important when power supplies are mounted next to RF PA circuits in the same chassis. The 250 VDC Hi-Pot rating covers the reinforced insulation requirements for telecom isolation barriers per IEC 62368-1.
Recommended
Recommended Products Summary
Engineering reference data for FP1507R1-R185-R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | FP1507R1-R30-R | FP1507R1-R100-R | FP1507R1-R250-R | FP1507R2-R185-R | FP1507R1-R185-R (Vicor) |
|---|---|---|---|---|---|---|
| Package | Flat-Pac FP1507R (SMD) | Flat-Pac FP1507R - same | Flat-Pac FP1507R - same | Flat-Pac FP1507R - same | Flat-Pac FP1507R - same | Flat-Pac FP1507R - same |
| Brand | Eaton | Eaton | Eaton | Eaton | Eaton | Vicor |
| Inductance | 185 nH | 30 nH | 100 nH | 250 nH | 185 nH | 185 nH |
| Construction | Shielded drum core, dual flat conductor | Shielded drum core, dual flat conductor | Shielded drum core, dual flat conductor | Shielded drum core, dual flat conductor | Shielded drum core, dual flat conductor | Shielded drum core, dual flat conductor |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
| Hi-Pot Rating | 250 VDC / 2 s / 1.0 mA | 250 VDC / 2 s / 1.0 mA | 250 VDC / 2 s / 1.0 mA | 250 VDC / 2 s / 1.0 mA | 250 VDC / 2 s / 1.0 mA | 250 VDC / 2 s / 1.0 mA |
Key Differentiators
- Highest rated inductance in the FP1507R family still in production (vs FP1507R1-R30-R / R100-R / R250-R)
- Vicor cross-stock increases supply chain redundancy (vs Eaton-only source)
- R1 DCR indicator is the lowest-DCR bin (vs FP1507R2-R185-R)
Design Notes
Estimated: at 30 A continuous current through the 0.52 mOhm DCR, conduction loss is I^2 * R = 900 * 0.00052 = approximately 0.47 W. With reasonable copper thermal relief on the FP1507R footprint, the inductor's own internal heating adds ~10-15 C rise at this load. For applications that push current to 40-45 A for extended periods (close to saturation), copper-pour heatsinking and adequate airflow are required to keep the Flat-Pac device within its max operating temperature. Always derate the inductor to 60-70% of the rated Isat for continuous operation to balance saturation, temperature rise, and efficiency.
Follow the recommended land pattern in the Eaton FP1507R datasheet: the two main winding pads should have a stencil aperture that yields ~0.10-0.15 mm paste thickness for proper solder joint standoff. The Flat-Pac SMD footprint typically exposes two large solder pads on either end of the inductor body; ensure these pads are fully wetted with no voids, because cold joints cause both thermal hotspots and unstable inductance readings. Avoid placing high-current return-path traces directly under the inductor to minimize stray field coupling and prevent copper thickness issues in stack-up design.
Do not select a lower-inductance FP1507R variant (e.g., the R30 part with 30 nH) assuming it will be functionally equivalent at low loads - the inductance mismatch will dramatically change the converter's ripple amplitude, transient response, and right-half-plane zero placement in the control loop. Always verify that the chosen variant's saturation current and DCR match your worst-case load. Do not apply more than the rated 45 A; at saturation the inductance can drop >20%, which can cause voltage overshoot and instability in closed-loop regulators. The 250 VDC Hi-Pot rating is for conductor-to-core isolation - it does NOT mean the inductor can be used on a 250 VDC power rail.
Compliance Information
RoHS compliance is confirmed by the -R suffix in the part number per Eaton's Flat-Pac naming convention. AEC-Q100 qualification is not stated and is generally not applicable for power inductors. REACH, halogen-free, and conflict-mineral status were not surfaced in the provided Verified Web Data - see _validation_note.
