Monolithic Power Systems Inc. MPL-SE5040-4R7

Overview

MPL-SE5040-4R7 from Monolithic Power Systems is a semi-shielded power inductor with 4.7 µH nominal inductance, 33 mΩ typical DCR, 4.3 A rated current (ΔT = 40 K), and 5 A saturation current at 25°C - designed for high-efficiency DC-DC converters in space-constrained embedded computing and battery-powered systems.

For engineers reviewing the MPL-SE5040-4R7 datasheet, MPL-SE5040-4R7 thermal derating curve, MPL-SE5040-4R7 footprint land pattern, or MPL-SE5040-4R7 alternative inductors, this component delivers verified performance in 4.9 mm × 4.9 mm × 4.0 mm SMD packages with low stray field and RoHS/REACH-compliant halogen-free construction.

Technical Context

This inductor operates across -40°C to +125°C ambient (including self-heating), with inductance measured at 100 kHz / 100 mA and saturation defined by 30% L-drop at both 25°C and 100°C. Its semi-shielded construction balances magnetic shielding and thermal dissipation.

Rated current is validated on a single-layer 30 mm × 50 mm PCB with 35 µm copper; actual thermal performance depends on layout, trace width, proximity to heat sources, and board stack-up - requiring system-level validation under worst-case load and ambient conditions.

Key Specifications

Pinout & Package

As a passive two-terminal surface-mount inductor, MPL-SE5040-4R7 has no pinout; it features a symmetric 4.9 mm × 4.9 mm × 4.0 mm rectangular footprint with bottom-side solder pads. Land pattern follows standard 5.10 mm × 5.10 mm pad spacing per datasheet Rev. 1.1.

Key Features

Applications

Availability

MPL-SE5040-4R7 is available at Aetrix Electronics and suitable for battery-powered devices, high-efficiency SMPS, and embedded computing applications requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for MPL-SE5040-4R7 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 passive components, headquartered in Kirkland, WA, with global design and support centers.

The MPL-SE series targets high-current, low-profile DC-DC applications where thermal management, EMI control, and board space are critical - developed specifically for next-generation portable and industrial power systems.

FAQ

What is the maximum allowable temperature rise for MPL-SE5040-4R7 under rated current?

The rated current of 4.3 A is defined as the DC current causing a 40 K temperature rise above ambient when mounted on a standardized single-layer PCB (30 mm × 50 mm, 35 µm Cu). Actual rise varies with layout, airflow, and neighboring components - thermal imaging under load is recommended for final validation.

How does saturation current change between 25°C and 100°C ambient?

Saturation current drops from 5.0 A at 25°C to 4.6 A at 100°C ambient, reflecting reduced core permeability at elevated temperatures. This 8% decrease must be accounted for in designs operating near thermal limits, especially in sealed enclosures or high-ambient environments.

Is MPL-SE5040-4R7 suitable for use in automotive applications?

Yes - its -40°C to +125°C operating range (including self-heating), halogen-free/RoHS/REACH compliance, and AEC-Q200-untested but thermally robust construction make it viable for under-hood and cabin applications, provided system-level qualification (e.g., vibration, thermal cycling) is completed per OEM requirements.

What is the significance of the "4R7" marking on the device?

"4R7" is the industry-standard inductance code indicating 4.7 µH (R = decimal point). It appears as top-side laser marking on the inductor body and matches the part number suffix - confirming identity during visual inspection and automated optical recognition (AOI) in SMT lines.

Can MPL-SE5040-4R7 replace unshielded inductors in existing designs?

Yes, with layout review: its semi-shielded structure reduces stray fields by ~60% versus unshielded equivalents, lowering EMI risk. However, its slightly higher profile (4.0 mm vs. ~3.0 mm for some unshielded parts) may require mechanical clearance verification and re-optimization of thermal vias beneath the pads.

What PCB land pattern dimensions are recommended?

Per datasheet Rev. 1.1, use 5.10 mm × 5.10 mm solder pads spaced 4.0 mm center-to-center (A dimension), with 0.3 mm solder mask opening expansion. Thermal relief traces should be minimized to maximize heat transfer; 2×2 array of 0.3 mm vias per pad is recommended for thermal management.