Monolithic Power Systems Inc. MPL-SE4030-3R3

Overview

MPL-SE4030-3R3 from Monolithic Power Systems is a semi-shielded power inductor with 3.3 µH nominal inductance (±20%), 40 mΩ typical DCR, 3.3 A rated current (ΔT = 40 K), 4.1 A saturation current at 25°C, and 4 mm × 4 mm × 3 mm footprint-designed for DC-DC converter output filtering in high-efficiency SMPS.

For engineers reviewing the MPL-SE4030-3R3 datasheet, MPL-SE4030-3R3 pinout (SMD terminals), MPL-SE4030-3R3 application in buck converter output stages, or MPL-SE4030-3R3 equivalent for compact power inductors with low stray field and +125°C max operating temperature, this page delivers verified electrical, thermal, and mechanical specifications.

Technical Context

This inductor uses a semi-shielded ferrite core construction to balance magnetic shielding and thermal dissipation, enabling stable inductance under DC bias while minimizing EMI coupling to adjacent components. Its 3.3 µH value is optimized for 500 kHz–2 MHz switching frequencies in point-of-load converters.

Rated current (3.3 A) is defined by 40 K temperature rise on a standardized single-layer PCB (30 mm × 50 mm, 35 µm Cu); saturation current (4.1 A at 25°C, 3.6 A at 100°C) reflects 30% inductance drop-critical for maintaining regulation during transient load steps.

Key Specifications

Pinout & Package

Two-terminal surface-mount device with bottom-side solder pads (no polarity). Package: 4.0 mm × 4.0 mm × 3.0 mm molded semi-shielded structure per datasheet Rev. 1.2 land pattern.

Key Features

Applications

Availability

MPL-SE4030-3R3 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 traceable sourcing.

Supply support for MPL-SE4030-3R3 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.

The MPL-SE series targets space-constrained, thermally demanding DC-DC applications where low-profile, semi-shielded inductors with predictable saturation behavior are required-especially in consumer, industrial, and computing power supplies.

FAQ

What is the maximum allowable temperature rise for MPL-SE4030-3R3 under rated current?

The rated current of 3.3 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 copper). Actual rise depends on PCB layout, copper area, airflow, and proximity to heat sources.

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

Saturation current drops from 4.1 A at 25°C to 3.6 A at 100°C ambient-reflecting reduced core permeability at elevated temperatures. This 12% decrease must be accounted for in worst-case thermal design to avoid inductance collapse during high-temp operation.

Is MPL-SE4030-3R3 RoHS and REACH compliant?

Yes. MPL-SE4030-3R3 is lead-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Compliance documentation is available via MPS Quality Assurance portal.

What is the significance of the "3R3" marking on the component body?

"3R3" is the industry-standard EIA code indicating 3.3 µH nominal inductance (R = decimal point). It appears as laser-marked text on the top surface and corresponds directly to the part number suffix.

Can MPL-SE4030-3R3 be used in automotive applications?

Yes-its −40°C to +125°C operating range, AEC-Q200 alignment (per MPS internal qualification), and robust semi-shielded construction make it suitable for under-hood and infotainment power supplies, provided board-level thermal management meets system requirements.

What is the recommended land pattern for MPL-SE4030-3R3?

The official land pattern (Rev. 1.2) specifies two 2.0 mm × 2.5 mm solder pads spaced 2.8 mm center-to-center, with 0.3 mm solder mask expansion. Use of this pattern ensures optimal thermal transfer and mechanical reliability per MPS validation testing.