Monolithic Power Systems Inc. MPL-AT2512-R33

Overview

MPL-AT2512-R33 from Monolithic Power Systems is a low-profile molded power inductor with 0.33 µH nominal inductance (±20%), 13 mΩ typical DCR, 6.4 A rated current (ΔT = 40 K), and 7.8 A saturation current at both 25°C and 100°C ambient - optimized for high-frequency DC-DC converters in space-constrained portable electronics.

For engineers reviewing the MPL-AT2512-R33 datasheet, MPL-AT2512-R33 package dimensions, MPL-AT2512-R33 thermal derating curve, or MPL-AT2512-R33 alternative inductors for 1–3 MHz buck regulators, this page delivers verified electrical specs, application-specific performance context, and supply-chain-ready availability details.

Technical Context

This molded SMD inductor uses soft-saturation ferrite core material to maintain gradual inductance roll-off under high DC bias, enabling stable regulation in high-switching-frequency buck converters. Its 2.5 mm × 2.0 mm × 1.2 mm footprint supports ultra-thin PCB designs while sustaining operation from –40°C to +125°C (including self-heating).

Designed for continuous conduction mode (CCM) operation, it delivers low audible noise due to constrained magnetostrictive effects and exhibits a typical self-resonant frequency of 132 MHz - well above typical SMPS switching ranges (1–3 MHz), ensuring minimal impedance deviation across operating bandwidth.

Key Specifications

Pinout & Package

As a passive two-terminal surface-mount inductor, MPL-AT2512-R33 has no active pins or signal assignments. It features a molded epoxy-coated rectangular package measuring 2.50 mm × 2.00 mm × 1.20 mm max, with top-side dot marking indicating start of winding. Recommended land pattern: 2.30 mm × 0.90 mm pads with 0.50 mm spacing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-profile molded inductor applications.

Compared with MPL-AT2512-R47 and TDK VLS201610ET-330M, the MPL-AT2512-R33 delivers the highest current density (6.4 A in 2.5×2.0 mm) and lowest DCR among 0.33 µH molded inductors in its height class - making it optimal for thermally constrained, high-efficiency portable power designs.

Availability

MPL-AT2512-R33 is available at Aetrix Electronics and suitable for wearable power management, IoT edge node DC-DC conversion, and portable medical device applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MPL-AT2512-R33 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 for power conversion, battery management, and motor control.

The MPL-AT series is engineered specifically for high-frequency, low-profile DC-DC applications in portable and battery-powered systems - emphasizing thermal robustness, miniaturization, and low-noise operation.

FAQ

What is the maximum allowable board temperature rise when operating MPL-AT2512-R33 at its rated current?

The rated current of 6.4 A is defined as the DC current causing a 40 K temperature rise above ambient when mounted on a standardized single-layer PCB (30×50 mm, 35 µm Cu). Total operating temperature must not exceed +125°C, meaning ambient + ΔT ≤ 125°C - e.g., at 85°C ambient, max ΔT = 40 K is permitted.

Does MPL-AT2512-R33 support reflow soldering per J-STD-020?

Yes - MPL-AT2512-R33 is qualified for standard lead-free reflow profiles (peak temperature ≤260°C, 20–40 sec dwell). The molded epoxy body withstands thermal cycling without cracking or delamination, and the terminations meet IPC-J-STD-002B solderability requirements.

How does the 7.8 A saturation current at 100°C compare to typical ferrite inductors?

Unlike many ferrite inductors whose ISAT degrades significantly above 60°C, MPL-AT2512-R33 maintains identical 7.8 A ISAT at both 25°C and 100°C - reflecting proprietary core material formulation that minimizes permeability shift with temperature, critical for sealed or high-ambient environments.

Can MPL-AT2512-R33 be used in automotive cabin applications?

No - while its –40°C to +125°C operating range overlaps with some automotive ambient zones, MPL-AT2512-R33 is not AEC-Q200 qualified, lacks automotive-grade screening, and has not undergone vibration, shock, or extended lifetime testing required for automotive use.

Is there a recommended PCB layout for minimizing thermal resistance?

Yes - maximize copper area under both terminals using thermal vias (≥4×0.3 mm diameter) connecting to inner ground/power planes. Avoid placing heat-generating ICs directly adjacent. Maintain ≥1.5 mm clearance from other components to reduce convective heating and ensure airflow around the inductor body.

What is the significance of the dot marking on the top surface?

The dot indicates the start of the internal winding. Maintaining consistent orientation (dot toward switch node) in multi-phase or coupled-inductor layouts reduces common-mode EMI and improves current sharing accuracy - especially important in interleaved buck converters.