Monolithic Power Systems Inc. MPL-AY1265-R47

Overview

MPL-AY1265-R47 from Monolithic Power Systems is a molded power inductor with 0.47 µH nominal inductance, 33 A rated current (ΔT = 40 K), and 64 A saturation current at both 25°C and 100°C ambient. It features ultra-low DCR (0.89 mΩ typ), soft saturation behavior, and operates from –40°C to +155°C. Used in high-current, high-frequency DC-DC converters for FPGA and POL applications.

For engineers reviewing the MPL-AY1265-R47 datasheet, MPL-AY1265-R47 pinout, MPL-AY1265-R47 application, or MPL-AY1265-R47 equivalent, key selection criteria include its 0.47 µH inductance tolerance (±20%), 1.04 mΩ max DCR, 70 MHz self-resonant frequency, molded construction for low audible noise, and compatibility with high-temperature PCB layouts in compact 13.5 × 12.6 × 6.2 mm footprint.

Technical Context

This molded inductor is optimized for buck converter output filtering and energy storage in point-of-load (POL) and high-current SMPS designs. Its soft saturation profile maintains gradual inductance roll-off under overload, improving system robustness during transient load steps.

Designed for operation up to +155°C including self-heating, it supports stable performance in thermally constrained embedded computing and battery-powered systems. The 35 µm copper single-layer PCB test condition defines its thermal rating baseline, but actual ΔT depends on layout, trace width, and adjacent component placement.

Key Specifications

Pinout & Package

MPL-AY1265-R47 is a two-terminal surface-mount molded inductor with no active pins or internal circuitry. It uses a rectangular SMD package with exposed copper terminals on opposite long edges for low-inductance, high-current solder connections. The top marking includes dot indicating start of winding and code "R47" for 0.47 µH.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current molded inductor applications.

Compared with Vishay IHLP-1265EZ-01 and Coilcraft XAL1510-471MEB, MPL-AY1265-R47 delivers superior current handling (64 A ISAT), lowest DCR (0.89 mΩ), and tighter thermal envelope (6.2 mm height), making it optimal for next-gen high-density, high-efficiency POL systems where size, loss, and transient response are co-constrained.

Availability

MPL-AY1265-R47 is available at Aetrix Electronics and suitable for FPGA core voltage regulation, high-current POL converters, and battery-powered industrial tablets requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MPL-AY1265-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.

MPL-AY1265-R47 belongs to MPS's molded power inductor product line, engineered specifically for high-current, high-frequency DC-DC conversion in space- and thermally-constrained applications such as AI accelerators, embedded computing, and portable industrial electronics.

FAQ

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

The rated current of 33 A is defined as the DC current causing a 40 K temperature rise above ambient on a standardized single-layer PCB (30 × 50 mm, 35 µm Cu). Actual rise depends on layout - wider traces, internal copper planes, and airflow reduce ΔT. Do not exceed +155°C total case temperature under worst-case conditions.

Does MPL-AY1265-R47 support automated optical inspection (AOI) after reflow?

Yes. Its molded epoxy body provides uniform surface reflectivity and consistent top marking ("R47" + dot), enabling reliable AOI detection of placement, polarity, and solder joint integrity. No exposed windings or irregular contours interfere with standard AOI algorithms.

How does soft saturation improve system reliability compared to hard-saturation inductors?

Soft saturation causes inductance to decline gradually (e.g., 30% drop at 64 A), avoiding abrupt collapse that can trigger overcurrent protection or cause voltage overshoot. This preserves control-loop stability during fast load transients - especially critical in FPGA and AI accelerator rails where di/dt exceeds 20 A/µs.

Can this inductor be used in an interleaved two-phase buck converter?

Yes. Its symmetric terminal layout, low profile, and matched thermal characteristics make it ideal for interleaved designs. Use identical part numbers per phase to ensure current balancing; the 6.2 mm height avoids shadowing in stacked layouts, and molded construction prevents phase-to-phase acoustic coupling.

Is the "R47" marking polarity-sensitive, and how is winding direction indicated?

Yes - the "·" (dot) adjacent to "R47" marks the start of winding. This polarity matters in coupled inductors or when paralleling multiple units for current sharing. Reverse orientation may affect EMI signature or phase alignment in multi-phase systems; always align dots consistently across channels.

What is the recommended land pattern per the datasheet?

The official land pattern specifies 8.0 mm × 5.0 mm copper pads (ref dimensions A/B), spaced 14.50 mm center-to-center, with 0.3 mm solder mask opening beyond pad edges. Thermal vias under pads are strongly recommended - ≥6 × 0.3 mm vias per terminal, filled or capped, to enhance heat dissipation into inner layers.

Does this inductor meet AEC-Q200 for automotive applications?

No - MPL-AY1265-R47 is not AEC-Q200 qualified. While its -40°C to +155°C operating range overlaps automotive under-hood requirements, it lacks the stress testing, lot traceability, and failure analysis reporting mandated by AEC-Q200. For automotive, consider MPS's AEC-Q200-qualified MPL-AYxxxA series instead.