Monolithic Power Systems Inc. MPL-SE4030-4R7

Overview

MPL-SE4030-4R7 from Monolithic Power Systems is a semi-shielded power inductor with 4.7 µH nominal inductance (±20%), 62 mΩ typical DCR, 2.6 A rated current (ΔT = 40 K), 3.4 A saturation current at 25°C, and operates from –40°C to +125°C ambient including self-heating - deployed in high-efficiency DC-DC converters for embedded computing and battery-powered devices.

For engineers reviewing the MPL-SE4030-4R7 datasheet, MPL-SE4030-4R7 pinout (though non-pin device), MPL-SE4030-4R7 application in buck converter output filters or input EMI suppression, or MPL-SE4030-4R7 equivalent for compact 4.7 µH power inductors with low stray field and RoHS-compliant construction, this page delivers verified electrical, thermal, and mechanical specifications directly aligned with MPS Rev. 1.2 documentation.

Technical Context

This inductor is optimized for high-frequency switching regulators (up to 47 MHz self-resonant frequency) and features semi-shielded construction to minimize magnetic coupling while maintaining thermal performance under continuous DC bias. Its 4 mm × 4 mm × 3 mm footprint supports dense PCB layouts in space-constrained applications.

Inductance is characterized at 100 kHz / 100 mA; saturation thresholds are defined by 30% L-drop at both 25°C and 100°C ambient, enabling accurate design margining for worst-case thermal conditions in automotive and industrial power stages.

Key Specifications

Pinout & Package

As a two-terminal passive component, MPL-SE4030-4R7 has no pinout; it uses surface-mount terminals compatible with standard reflow profiles. Package is semi-shielded molded SMD inductor measuring 4.5 mm × 4.5 mm × 3.0 mm (L×W×H), with land pattern optimized for thermal dissipation on single-layer PCBs.

Key Features

Applications

Availability

MPL-SE4030-4R7 is available at Aetrix Electronics and suitable for battery-powered devices, high-efficiency SMPS, and embedded computing applications requiring stable component supply, consistent thermal performance, and RoHS-compliant magnetics.

Supply support for MPL-SE4030-4R7 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs and integrated magnetics, headquartered in Kirkland, WA, with global design and support operations.

The MPL-SE series is engineered for compact, high-current DC-DC converter applications demanding low-profile, thermally robust, and EMI-conscious inductors - targeting space-constrained power supplies in computing, industrial, and portable electronics.

FAQ

What is the recommended PCB layout for optimal thermal performance?

Mount MPL-SE4030-4R7 on a single-layer 30 mm × 50 mm PCB with 35 µm copper thickness, using thermal pads connected to internal ground planes if multilayer. Avoid placing heat-generating components within 3 mm; maintain ≥1 mm clearance to adjacent traces to limit thermal coupling and ensure ΔT stays within 40 K at 2.6 A.

How does saturation current change with ambient temperature?

Saturation current decreases with rising ambient temperature: ISAT drops from 3.4 A at 25°C to 2.7 A at 100°C (30% L-drop criterion). This reflects core material permeability reduction and must be accounted for in worst-case thermal design - e.g., automotive under-hood applications require derating below 2.7 A continuous.

Is MPL-SE4030-4R7 suitable for automotive AEC-Q200 applications?

No - MPL-SE4030-4R7 is not AEC-Q200 qualified. While its operating temperature range (–40°C to +125°C) meets automotive ambient requirements, it lacks the stress testing, failure analysis, and qualification documentation required for AEC-Q200 Grade 2 or Grade 3 applications. Use only in non-safety-critical automotive subsystems with customer-specific validation.

Can this inductor replace MPL-SE4030-4R7-R?

Yes - MPL-SE4030-4R7-R is the tape-and-reel packaging variant of the same electrical and mechanical specification. The "-R" suffix denotes reel packaging (3000 pcs/reel); base part MPL-SE4030-4R7 refers to the same device and may be supplied in cut tape or custom packaging depending on order configuration.

What is the significance of the "4R7" marking on the component body?

"4R7" is the industry-standard inductance code indicating 4.7 µH: "R" replaces the decimal point, so "4R7" = 4.7 µH. This marking is laser-etched on the top surface and aligns with IEC 60062 conventions used across MPS's molded inductor families.

Does this inductor exhibit significant AC resistance increase at high frequencies?

Yes - AC resistance rises with frequency due to skin and proximity effects. At 1 MHz, RAC is ~1.3× RDC (≈81 mΩ); at 10 MHz, it reaches ~2.1× RDC (≈130 mΩ). This must be factored into total power loss calculations for high-frequency SMPS designs (>500 kHz), especially when evaluating efficiency at light loads.