Monolithic Power Systems Inc. MPL-SE4030-2R2

Overview

MPL-SE4030-2R2 from Monolithic Power Systems is a semi-shielded power inductor with 2.2 µH nominal inductance (±20%), 30 mΩ typical DC resistance, 3.7 A rated current (ΔT = 40 K), and operates from –40°C to +125°C ambient including self-heating; used in high-efficiency buck converters for embedded computing and battery-powered devices.

For engineers reviewing the MPL-SE4030-2R2 datasheet, MPL-SE4030-2R2 pinout (SMT terminals), MPL-SE4030-2R2 application in input filters or SMPS output chokes, or MPL-SE4030-2R2 equivalent for compact 4×4×3 mm inductors with low stray field and RoHS/halogen-free compliance, this page delivers verified electrical, thermal, and mechanical specifications directly from MPS Rev. 1.2 documentation.

Technical Context

This inductor employs a semi-shielded ferrite core construction with copper winding optimized for DC-DC converter energy storage and ripple suppression. Its 2.2 µH value targets mid-current buck stages operating at 500 kHz–2 MHz switching frequencies, where saturation margin at 100°C (4.2 A) and low DCR (30 mΩ typ.) jointly support efficiency >95% in space-constrained designs.

Thermal performance is characterized on a standardized single-layer PCB (30×50 mm, 35 µm Cu); actual temperature rise depends on layout, adjacent heat sources, and airflow. The 77 MHz self-resonant frequency confirms suitability for switch-mode applications below 10 MHz, with minimal impedance roll-off in the target operating band.

Key Specifications

Pinout & Package

Two-terminal surface-mount device in semi-shielded molded package measuring 4.5 mm × 4.5 mm × 3.0 mm (L×W×H), with exposed copper pads on bottom for thermal and electrical connection. Land pattern per MPS Rev. 1.2 requires 2.0 mm × 2.5 mm solder pads spaced 2.5 mm center-to-center.

Key Features

Applications

Availability

MPL-SE4030-2R2 is available at Aetrix Electronics and suitable for battery-powered portable devices, high-efficiency SMPS, and embedded computing power rails requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MPL-SE4030-2R2 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 is engineered for compact, high-current DC-DC converter applications demanding low profile, thermal robustness, and minimized EMI-targeting space-constrained consumer, industrial, and computing systems.

FAQ

What is the exact physical footprint and height of MPL-SE4030-2R2?

The device measures 4.5 mm × 4.5 mm in length and width (ref dimensions), with a maximum height of 3.0 mm. Terminal pads are centered on the bottom surface, spaced 2.5 mm apart center-to-center, and require a 2.0 mm × 2.5 mm land pattern per MPS Rev. 1.2 layout guidelines.

How does the 4.2 A saturation current at 100°C differ from the 5.5 A value at 25°C?

The 4.2 A rating reflects the DC current causing 30% inductance drop when ambient temperature is held at 100°C-critical for derating in thermally constrained enclosures. The 5.5 A value applies only at 25°C ambient and cannot be used without thermal margin analysis in real-world operation.

Is MPL-SE4030-2R2 suitable for automotive applications?

Yes-it meets the –40°C to +125°C operating temperature range required for under-hood and cabin electronics. However, it is not AEC-Q200 qualified; for automotive-grade qualification, consult MPS for AEC-qualified variants such as the MPL-AY series.

Can this inductor replace a toroidal or drum-core inductor in an existing design?

Direct replacement requires validation of saturation behavior, thermal rise, and EMI profile. MPL-SE4030-2R2's semi-shielded construction offers lower stray field than drum cores but less shielding than toroids; its 30 mΩ DCR and 77 MHz SRF must match the original's electrical envelope.

What does "2R2" signify in the part number?

"2R2" is the EIA inductance code meaning 2.2 µH: 'R' replaces the decimal point, so 2R2 = 2.2. This coding aligns with industry-standard marking for surface-mount inductors and is confirmed in the top-side marking and MPS datasheet Table 1.

Does the 37 mΩ maximum DCR include solder joint resistance?

No-the 37 mΩ maximum is the intrinsic winding resistance of the inductor only, measured per JIS C 5402 at 25°C. Solder joint resistance adds ~0.2–0.5 mΩ depending on pad size, paste volume, and reflow profile, and must be accounted for separately in total power loss calculations.