Monolithic Power Systems Inc. MPL-SE5040-1R5

Overview

MPL-SE5040-1R5 from Monolithic Power Systems is a semi-shielded power inductor with 1.5 µH nominal inductance (±20%), 14 mΩ typical DCR, 6.2 A rated current (ΔT = 40 K), 9.3 A saturation current at 25°C, and 70 MHz self-resonant frequency - designed for high-efficiency DC-DC converters in embedded computing and battery-powered systems.

For engineers reviewing the MPL-SE5040-1R5 datasheet, MPL-SE5040-1R5 package dimensions, MPL-SE5040-1R5 thermal derating, or MPL-SE5040-1R5 alternative inductors, this component delivers verified performance in compact 4.9 mm × 4.9 mm × 4.0 mm footprint applications requiring low stray field and stable operation up to +125°C ambient.

Technical Context

This inductor is optimized for buck converter output filtering and energy storage in high-frequency switching power supplies operating up to several MHz. Its semi-shielded construction balances magnetic shielding efficiency with thermal dissipation capability, supporting continuous operation at rated current with ≤40 K temperature rise on standard PCB layouts.

The device exhibits defined saturation behavior (30% L drop at ISAT), predictable DCR-based thermal limits, and stable inductance across 100 kHz–10 MHz - enabling accurate ripple current prediction and loop compensation in fixed-frequency and COT-controlled SMPS designs.

Key Specifications

Pinout & Package

As a passive two-terminal inductor, MPL-SE5040-1R5 has no pinout; it features a surface-mount, semi-shielded molded construction in a 4.9 mm × 4.9 mm × 4.0 mm footprint with bottom-side solder pads. Land pattern follows MPS-recommended pad layout (ref. Rev. 1.1, p.4), with top marking "1R5" indicating 1.5 µH value.

Key Features

Applications

Availability

MPL-SE5040-1R5 is available at Aetrix Electronics and suitable for battery-powered devices, high-efficiency SMPS, and embedded computing applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MPL-SE5040-1R5 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 magnetics, headquartered in Kirkland, WA, with global design and support operations.

The MPL-SE series is engineered specifically for space-constrained, high-current DC-DC applications where thermal performance, EMI control, and reliability under thermal cycling are critical - targeting next-generation portable, industrial, and automotive power systems.

FAQ

What is the recommended PCB land pattern for MPL-SE5040-1R5?

The official land pattern is specified in Rev. 1.1 datasheet page 4: two 3.0 mm × 3.0 mm solder pads spaced 3.4 mm center-to-center, with 0.3 mm solder mask opening clearance. Use thermal vias under pads for enhanced heat dissipation in high-current layouts.

How does the semi-shielded construction affect EMI performance compared to fully shielded inductors?

Semi-shielded construction reduces far-field magnetic radiation by ~15 dB versus unshielded types while allowing better thermal conduction than fully shielded variants. It avoids eddy current losses in metal cans, preserving Q-factor and efficiency above 1 MHz.

Can MPL-SE5040-1R5 be used in automotive applications?

Yes - its −40°C to +125°C operating range, halogen-free RoHS/REACH compliance, and AEC-Q200 qualification (per MPS internal testing protocol) support use in non-safety-critical automotive subsystems such as infotainment power rails and body control modules.

What causes the difference between IR (6.2 A) and ISAT (9.3 A)?

IR is thermally limited (40 K rise), while ISAT is magnetically limited (30% L drop). At 6.2 A, temperature rise reaches design limit; at 9.3 A, core saturation begins - making IR the practical max continuous current, and ISAT the peak transient limit.

Is there a tape-and-reel packaging option for volume orders?

Yes - MPL-SE5040-1R5 ships in EIA-481-compliant tape-and-reel format: 2,000 units per reel, 12 mm tape width, 4 mm pocket depth. Reel ID is 330 mm; orientation is top-marking visible, component centered in pocket.

How does ambient temperature affect saturation current rating?

Saturation current decreases with rising ambient: ISAT is 9.3 A at 25°C but drops to 8.4 A at 100°C due to reduced core permeability and increased copper resistance - requiring derating in high-temp enclosures or stacked-board assemblies.