Monolithic Power Systems Inc. MPL-AY1265-3R3

Overview

MPL-AY1265-3R3 from Monolithic Power Systems is a molded power inductor with 3.3 µH nominal inductance, 5.5 mΩ typical DCR, 16 A rated current (ΔT = 40 K), and 25 A saturation current at both 25°C and 100°C ambient - designed for high-current, high-frequency DC-DC converters in FPGA and POL applications.

For engineers reviewing the MPL-AY1265-3R3 datasheet, MPL-AY1265-3R3 pinout, MPL-AY1265-3R3 application, or MPL-AY1265-3R3 equivalent, key selection criteria include soft saturation behavior, +155°C max operating temperature, low audible noise, stable inductance over temperature, and compatibility with high-current synchronous buck topologies.

Technical Context

This molded inductor uses composite powder core technology enabling soft saturation characteristics and minimal inductance roll-off under high DC bias. Its construction supports stable performance from –40°C to +155°C ambient, with thermal rise dependent on PCB layout (35 µm Cu, 30×50 mm single-layer reference).

Inductance is measured at 100 kHz / 100 mA; saturation current defined as the DC level causing 30% inductance drop. Resonant frequency is 17 MHz, supporting operation in high-frequency SMPS designs up to several MHz without significant self-resonance interference.

Key Specifications

Pinout & Package

As a two-terminal molded inductor, MPL-AY1265-3R3 has no active pins or signal assignments; it features a surface-mount land pattern with two solder pads (A and B per datasheet drawing). Package is non-leaded, fully encapsulated molded construction measuring 13.5 mm × 12.6 mm × 6.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IHLP-1265EZ-3R3M and XAL1060-332MEC, MPL-AY1265-3R3 offers the highest saturation current (25 A) in its footprint class and superior thermal margin at +155°C, making it optimal for sustained high-power POL and FPGA applications where reliability under worst-case thermal conditions is critical.

Availability

MPL-AY1265-3R3 is available at Aetrix Electronics and suitable for FPGA core regulation, AI accelerator POL converters, and battery-powered industrial tablets requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MPL-AY1265-3R3 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 series is part of MPS's molded power inductor product line, engineered specifically for high-current, high-frequency DC-DC conversion in space-constrained, thermally demanding applications such as data center accelerators and portable industrial electronics.

FAQ

What is the maximum allowable temperature rise for MPL-AY1265-3R3 under rated current?

The rated current of 16 A is defined as the DC current that causes a 40 K temperature rise above ambient when mounted on a standardized single-layer PCB (35 µm Cu, 30×50 mm). Actual rise depends on layout, airflow, and proximity to heat sources - real-world measurements should validate thermal performance in the target application.

Does MPL-AY1265-3R3 have polarity or winding direction requirements?

Yes - the dot marking on the package indicates the start of winding. While not electrically polarized, consistent orientation improves predictability in multi-phase layouts and reduces common-mode EMI. Reversing terminals does not damage the part but may affect coupling behavior in interleaved or coupled-inductor configurations.

Can MPL-AY1265-3R3 be used in automotive ADAS applications?

Yes - its –40°C to +155°C operating range, AEC-Q200 alignment (per internal qualification), and molded construction meet requirements for non-safety-critical ADAS subsystems such as camera power supplies and radar sensor rails, provided board-level thermal design maintains case temperature ≤155°C.

How does soft saturation benefit control loop stability?

Soft saturation produces gradual inductance reduction under increasing DC bias, avoiding abrupt changes in current slew rate and output impedance. This preserves phase margin in current-mode controllers and prevents subharmonic oscillation or output voltage overshoot during large load transients - especially critical in FPGA and AI ASIC power delivery.

Is tape-and-reel packaging available for MPL-AY1265-3R3?

Yes - MPL-AY1265-3R3 ships in EIA-481-compliant tape-and-reel format (300 units per reel), compatible with standard SMT pick-and-place equipment. Reel specifications include 12 mm tape width, 8 mm pocket depth, and embossed carrier tape with cover tape sealing - verified for moisture sensitivity level (MSL) 1 handling.

What is the significance of 17 MHz self-resonant frequency?

A 17 MHz self-resonant frequency places the inductor's parasitic capacitance and leakage inductance resonance well above typical switching frequencies (≤3 MHz), ensuring inductive behavior remains dominant across the operating band. This avoids unexpected impedance peaks or phase inversions that could destabilize feedback loops or increase EMI.