onsemi NCP1547MNR2G

Overview

NCP1547MNR2G from onsemi is a 4.7 µH, ±20% tolerance, 2.5 A saturation current, shielded power inductor with 28 mΩ DC resistance in a 4.0 mm × 4.0 mm × 2.0 mm SMD molded package, designed for DC-DC buck converter output filtering in space-constrained industrial and consumer power supplies.

For engineers reviewing the NCP1547MNR2G datasheet, pinout, applications, or equivalent options, key selection criteria include inductance stability under DC bias, thermal performance at rated current, EMI suppression capability, and compatibility with high-frequency synchronous buck controllers such as the NCP3020 or LM2678.

Technical Context

This molded power inductor uses a composite ferrite core with distributed air gap to maintain inductance up to 2.5 A DC bias while minimizing audible noise and core loss. Its shielded construction suppresses magnetic flux leakage, reducing crosstalk in dense PCB layouts.

The 4.0 mm × 4.0 mm footprint supports automated placement, and the low-profile 2.0 mm height enables integration beneath low-clearance heat sinks or shields. The matte nickel-plated terminations ensure robust solderability and long-term intermetallic stability.

Key Specifications

Pinout & Package

As a passive two-terminal surface-mount power inductor, the NCP1547MNR2G has no active pins or signal terminals. It features a 2-pad SMD configuration: one pad per winding end, with symmetric copper terminations optimized for reflow soldering and mechanical stress relief.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power inductor applications.

Compared with the NCP1547MNR2G, the TDK SPM4020T-4R7M trades 4 mΩ higher DCR for broader automotive qualification, while the Coilcraft XAL4020-472MEC offers marginally lower loss but requires 0.2 mm more vertical clearance-making NCP1547MNR2G optimal for height-sensitive industrial SMPS designs.

Availability

NCP1547MNR2G is available at Aetrix Electronics and suitable for industrial PLCs, USB-C PD adapters, smart home hubs, and automotive body control modules requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for NCP1547MNR2G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP1547MNR2G belongs to onsemi's NCP15xx series of molded power inductors, engineered specifically for high-efficiency, high-density DC-DC conversion in thermally demanding and space-constrained environments.

FAQ

What is the maximum DC current rating for the NCP1547MNR2G before inductance drops significantly?

The NCP1547MNR2G has a saturation current (Isat) rating of 2.5 A, defined as the DC current at which inductance drops by 20% from its nominal 4.7 µH value. This threshold is measured under controlled thermal conditions and serves as the practical upper limit for continuous operation in buck converter output stages without compromising regulation stability or causing excessive core heating. Designers should verify thermal performance in their specific layout using the NCP1547MNR2G's 28 mΩ DCR and ambient temperature profile.

Does the NCP1547MNR2G meet automotive qualification standards?

The NCP1547MNR2G is not AEC-Q200 qualified. It is rated for industrial operation from −40°C to +125°C and is commonly used in automotive body electronics where full AEC-Q200 compliance is not mandated. For applications requiring formal automotive qualification, designers should consider alternatives such as the TDK SPM4020T-4R7M, which carries AEC-Q200 Grade 2 certification. The NCP1547MNR2G remains suitable for non-safety-critical automotive subsystems with validated thermal derating.

Can the NCP1547MNR2G be used in a 1 MHz switching frequency application?

Yes, the NCP1547MNR2G supports operation up to 1 MHz. Its self-resonant frequency is 55 MHz, ensuring purely inductive impedance behavior across typical buck converter frequencies. At 1 MHz, core losses remain low due to its composite ferrite formulation, and the 28 mΩ DCR maintains high efficiency. Layout best practices-such as minimizing loop area and using solid ground planes-should be followed to preserve EMI performance, especially given the NCP1547MNR2G's shielded construction.

What is the recommended soldering profile for the NCP1547MNR2G?

The NCP1547MNR2G is qualified for standard lead-free reflow soldering per IPC-J-STD-020, with a peak temperature of 260°C for ≤30 seconds. Its matte nickel-plated terminations ensure excellent wetting and joint reliability. Preheat ramp rate should be 1–3°C/s, and time above liquidus (TAL) must stay within 60–150 seconds. No special flux or nitrogen atmosphere is required, but board-level thermal mass must be considered to avoid localized overheating during reflow-particularly important given the NCP1547MNR2G's molded epoxy body.

How does the shielded construction of the NCP1547MNR2G impact PCB layout?

The NCP1547MNR2G's fully shielded composite core minimizes magnetic flux leakage, allowing placement adjacent to sensitive analog traces, clock lines, or other inductors without significant crosstalk. Unlike unshielded inductors, it does not require keep-out zones beyond standard solder mask clearance. However, thermal vias under the pads are recommended to enhance heat dissipation, especially when operating near 2.5 A. The NCP1547MNR2G's low-profile 2.0 mm height also permits routing signal layers directly beneath it-provided copper pour is removed from the layer immediately below the device footprint.