Monolithic Power Systems Inc. MPL-SE5040-1R0

Overview

MPL-SE5040-1R0 from Monolithic Power Systems is a semi-shielded power inductor with 1.0 µH nominal inductance (±20%), 9.4 mΩ typical DCR, 7.6 A rated current (ΔT = 40 K), 10.5 A saturation current at 25°C, and 4.9 mm × 4.9 mm × 4.0 mm footprint-designed for high-current DC-DC converter output filtering in battery-powered embedded systems.

For engineers reviewing the MPL-SE5040-1R0 datasheet, MPL-SE5040-1R0 pinout (non-applicable-two-terminal passive), MPL-SE5040-1R0 application in buck converter output stages, or MPL-SE5040-1R0 equivalent inductor alternatives, this page delivers verified electrical specs, thermal derating context, package dimensions, and real-world use constraints per MPS Rev. 1.1.

Technical Context

This inductor employs a semi-shielded ferrite core with copper winding optimized for low AC/DC resistance trade-off and controlled magnetic flux leakage. Its 105 MHz self-resonant frequency enables stable operation beyond typical switching frequencies of 500 kHz–2 MHz buck regulators.

Thermal performance is defined under standardized PCB conditions: single-layer 30 mm × 50 mm board with 35 µm Cu, where rated current induces exactly 40 K temperature rise. Saturation thresholds are specified at both 25°C and 100°C ambient to support design margining across full operating range (-40°C to +125°C).

Key Specifications

Pinout & Package

Two-terminal surface-mount device in semi-shielded molded package; no active pins or internal circuitry. Dimensions: 4.9 mm × 4.9 mm × 4.0 mm (L × W × H), land pattern per MPS drawing with 2.10 mm center-to-center pad spacing.

Key Features

Applications

Availability

MPL-SE5040-1R0 is available at Aetrix Electronics and suitable for battery-powered portable devices, high-efficiency SMPS, and embedded computing applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for MPL-SE5040-1R0 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 for high-current, low-profile DC-DC converter applications-emphasizing thermal robustness, EMI control, and space-constrained board integration in portable and industrial power systems.

FAQ

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

The rated current of 7.6 A is defined to produce exactly a 40 K temperature rise above ambient on a standardized single-layer PCB (30 mm × 50 mm, 35 µm Cu). Actual board temperature must remain ≤+125°C including self-heating, so ambient must be ≤+85°C under full-rated load in worst-case layout.

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

Saturation current decreases from 10.5 A at 25°C to 9.0 A at 100°C ambient-reflecting reduced core permeability and earlier onset of flux saturation at elevated temperatures. This 14% reduction must be accounted for in thermal-margin-critical designs like automotive under-hood applications.

Is MPL-SE5040-1R0 suitable for use in automotive ADAS camera modules?

Yes-its -40°C to +125°C operating range, halogen-free construction, and AEC-Q200 alignment (per MPS qualification reports) support use in non-safety-critical ADAS subsystems. However, it is not AEC-Q200 certified out-of-box; system-level validation is required per OEM requirements.

Can this inductor replace unshielded types in noise-sensitive audio power supplies?

Yes-the semi-shielded construction reduces stray magnetic field by ≥70% versus comparable unshielded inductors, minimizing induced hum in nearby analog audio paths. Layout separation ≥5 mm from sensitive traces is still recommended per MPS application note AN-107.

What is the significance of the "1R0" marking on the device body?

"1R0" is the industry-standard EIA code indicating 1.0 µH nominal inductance (R = decimal point). It appears as laser-marked alphanumeric code on the top surface and corresponds directly to the part number's suffix, enabling visual verification during assembly and rework.

Does the 4.0 mm height include solder fillet or only the body?

The 4.0 mm dimension is the maximum body height per MPS mechanical drawing; it excludes solder fillet. Recommended stencil aperture and paste volume assume 0.15 mm solder thickness, resulting in total assembled height ≤4.25 mm-critical for low-profile enclosures and stacked PCB assemblies.