Monolithic Power Systems Inc. MPL-SE2512-4R7

Overview

MPL-SE2512-4R7 from Monolithic Power Systems is a semi-shielded power inductor with 4.7 µH nominal inductance (±20%), 165 mΩ typical DCR, 1.6 A rated current (ΔT = 40 K on single-layer PCB), and operates from –40°C to +125°C ambient including self-heating; used in DC-DC buck converters for portable battery-powered devices.

For engineers reviewing the MPL-SE2512-4R7 datasheet, MPL-SE2512-4R7 package dimensions, MPL-SE2512-4R7 thermal derating, or MPL-SE2512-4R7 saturation current behavior, this component supports compact high-efficiency power stages in space-constrained IoT and wearable applications where low stray field and stable inductance under DC bias are critical.

Technical Context

This inductor is optimized for step-down converter output filtering and energy storage, featuring semi-shielded construction that suppresses magnetic flux leakage while enabling higher saturation margins than unshielded types. Its 2.5 mm × 2.0 mm × 1.2 mm footprint targets ultra-thin PCB layouts.

Inductance is specified at 100 kHz / 100 mA; saturation current is defined as the DC level causing 30% inductance drop at both 25°C and 100°C ambient - confirming stable performance across full operating temperature range. Resonance frequency of 31 MHz indicates suitability for switching frequencies up to ~2–3 MHz.

Key Specifications

Pinout & Package

As a passive two-terminal surface-mount inductor, MPL-SE2512-4R7 has no active pins or signal assignments; it features a monolithic semi-shielded structure with bottom-side solder terminals. Package is standardized 2512 metric (2.5 mm × 2.0 mm × 1.2 mm) with land pattern per MPS Rev. 1.2 specification.

Key Features

Applications

Availability

MPL-SE2512-4R7 is available at Aetrix Electronics and suitable for battery-powered devices, wearable electronics, and IoT sensor nodes requiring stable component supply with consistent parametric performance across production lots.

Supply support for MPL-SE2512-4R7 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 magnetics, headquartered in Kirkland, WA, with global design and support operations.

The MPL-SE series is engineered specifically for space- and thermally constrained DC-DC applications in portable and wireless systems, emphasizing low-profile magnetics with controlled saturation and EMI behavior.

FAQ

What is the maximum allowable DC current before inductance drops by 30% at 100°C ambient?

The saturation current at 100°C ambient is 1.9 A typical, defined as the DC level causing a 30% inductance reduction. This value is confirmed in the datasheet's Electrical Characteristics table and validated via test conditions specified in Note (4). It reflects real-world thermal-stressed operation, not room-temperature only ratings.

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

Semi-shielded construction reduces magnetic flux leakage by containing the core's fringing fields, lowering near-field radiated emissions and crosstalk. Unlike fully shielded types, it avoids eddy-current losses and maintains higher Q-factor above 10 MHz, making it optimal for high-frequency buck converters where both EMI control and efficiency matter.

Can MPL-SE2512-4R7 be used in a 3 MHz switching converter?

Yes - its 31 MHz typical self-resonant frequency ensures inductive impedance dominates up to at least 5–6 MHz. At 3 MHz, impedance remains strongly inductive (Z ≈ 2πfL), and core losses stay within spec. Derating for AC loss and temperature rise should follow MPS application note AN051 for high-frequency operation.

What PCB layout recommendations minimize thermal rise beyond the 30×50 mm reference board?

To reduce thermal rise below the 40 K ΔT baseline, use ≥2 oz copper on inner layers, add thermal vias under both terminals (≥4 per pad), and extend copper pours beyond the 30×50 mm reference. Avoid placing heat-generating components nearby and ensure ≥1.5 mm clearance to other tall parts to maintain airflow.

Is the inductance tolerance symmetrical, and how does it impact feedback loop stability?

Yes - the ±20% inductance tolerance is symmetrical about 4.7 µH (i.e., 3.76–5.64 µH). In voltage-mode buck controllers, this directly affects crossover frequency and phase margin; designers should verify loop stability across the full inductance range using worst-case simulation or bench testing with min/max units.

Does MPL-SE2512-4R7 meet automotive AEC-Q200 requirements?

No - MPL-SE2512-4R7 is not AEC-Q200 qualified. It is rated for industrial and consumer applications with operating temperature up to +125°C, but lacks the stress testing, failure analysis, and qualification documentation required for automotive use. For AEC-Q200-compliant alternatives, consult MPS's automotive-grade MPL-A series.