Monolithic Power Systems Inc. MPL-AT2512-R47

Overview

MPL-AT2512-R47 from Monolithic Power Systems is a low-profile molded power inductor with 0.47 µH nominal inductance (±20%), 14 mΩ typical DCR, 5.8 A rated current (ΔT = 40 K), 6.4 A saturation current at both 25°C and 100°C, and 102 MHz self-resonant frequency - designed for high-frequency DC-DC converters in space-constrained portable electronics.

For engineers reviewing the MPL-AT2512-R47 datasheet, MPL-AT2512-R47 package dimensions, MPL-AT2512-R47 thermal derating curve, or MPL-AT2512-R47 alternative inductors, this page delivers verified electrical specs, application-specific performance context, PCB land pattern guidance, and real-world use constraints including temperature rise vs. current and inductance roll-off under DC bias.

Technical Context

This molded SMD inductor uses soft-saturation ferrite core material to maintain gradual inductance decline under DC bias-critical for stable loop response in buck converters operating above 1 MHz. Its 2.5 mm × 2.0 mm × 1.2 mm footprint supports ultra-thin designs while sustaining +125°C max operating temperature inclusive of self-heating.

Electrical behavior is characterized at 100 kHz / 100 mA for inductance, with R_DC measured at 25°C and saturation defined as 30% L-drop. Performance curves confirm minimal inductance variation up to 5 A and impedance peak near 102 MHz, enabling effective EMI filtering in input stages.

Key Specifications

Pinout & Package

As a passive two-terminal surface-mount inductor, MPL-AT2512-R47 has no active pins or signal assignments. It features a molded epoxy body with exposed copper terminations on opposite ends of the 2.5 mm × 2.0 mm base. The dot marking indicates start of winding. Recommended land pattern: 0.90 mm × 2.30 mm pads with 0.50 mm spacing (see MPS Rev. 1.2 datasheet p.3).

Key Features

Applications

Availability

MPL-AT2512-R47 is available at Aetrix Electronics and suitable for high-frequency buck converters, portable device power rails, IoT edge node PMICs, and wearable sensor subsystems requiring stable component supply, tight thermal margins, and ultra-low profile packaging.

Supply support for MPL-AT2512-R47 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-AT series is engineered specifically for compact, high-efficiency DC-DC conversion in battery-powered applications - emphasizing low height, thermal robustness, and predictable saturation behavior under dynamic loads.

FAQ

What is the maximum allowable PCB temperature rise when operating at rated current?

The rated current of 5.8 A is defined as the DC current causing a 40 K temperature rise above ambient when mounted on a single-layer 30 mm × 50 mm PCB with 35 µm copper. Actual rise depends on layout, airflow, and adjacent heat sources - measured data shows ~38 K rise under reference conditions per Figure 1 in Rev. 1.2 datasheet.

Does MPL-AT2512-R47 support reflow soldering per JEDEC J-STD-020?

Yes - the molded epoxy body and tin-silver-copper terminations are qualified for standard lead-free reflow profiles (peak 260°C, 20–40 sec). MPS confirms compatibility with IPC-A-610 Class 2 and Class 3 assembly requirements when using recommended land patterns and stencil apertures.

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

Unlike many inductors, MPL-AT2512-R47 specifies identical saturation current (6.4 A typ) at both 25°C and 100°C ambient - indicating thermally stable core material with minimal permeability drift across its full operating range, as validated by Figure 2 in the datasheet.

Can this inductor be used in a 4 MHz switching application?

Yes - with a 102 MHz self-resonant frequency, it remains inductive up to ≥5× typical 4 MHz operation. However, AC resistance rises significantly above 10 MHz (see Figure 5), so core and copper losses must be evaluated via thermal imaging at full load to ensure <+125°C total temperature.

Is there a recommended PCB layout for minimizing EMI radiation?

MPS recommends placing the inductor with its dot-marked end oriented toward the switch node and routing the high-di/dt path as a tight loop between SW pin, inductor, and output capacitor. Ground plane clearance beneath the inductor improves field containment - details are provided in Application Note AN-116 "Layout Guidelines for MPL Inductors".

What is the shelf life and moisture sensitivity level (MSL)?

MPL-AT2512-R47 is shipped in dry-packed tape-and-reel (MSL 1, unlimited floor life per J-STD-033). Storage conditions are −10°C to +40°C at <50% RH. No baking is required prior to assembly unless exposed to ambient >60% RH for >168 hours.