Power Inductor[2]

Updated: 2026-09-12

Overview

The VLS4012ET-4R7M is a surface-mount power inductor designed for high-frequency power conversion applications. As part of the VLS series, it features a shielded construction that minimizes electromagnetic interference (EMI) while providing stable inductance characteristics. The 4.7μH inductance value with ±20% tolerance makes it suitable for switching frequencies typically between 500kHz to 3MHz in modern power electronics. This component is particularly valued for its compact 4020 package size (4.0x4.0x1.2mm), which allows for high-density PCB layouts in space-constrained applications. The inductor's design incorporates advanced materials and winding techniques to achieve low DC resistance (DCR) while maintaining high saturation current capability.

Structure and Working Principle

The VLS4012ET-4R7M consists of a ferrite core wrapped with precision copper windings, encapsulated in a magnetic shielding material. The shield reduces flux leakage and improves EMI performance compared to unshielded inductors. The core material is specially formulated to maintain stable permeability across a wide temperature range. When current flows through the inductor, it stores energy in its magnetic field. During switching cycles in DC-DC converters, this stored energy is released to maintain continuous current flow. The component's low DCR (typically 0.032Ω) minimizes power loss and heat generation, while its high saturation current (up to 4.4A) ensures reliable operation under load variations.

Key Features

This power inductor delivers several performance advantages including a temperature range of -40°C to +125°C, making it suitable for automotive and industrial applications. The component exhibits excellent DC bias characteristics, maintaining over 70% of its initial inductance at rated current. Other notable features include RoHS compliance, lead-free termination, and compatibility with standard reflow soldering processes. The shielded construction not only reduces EMI but also prevents interference from nearby components, making it ideal for densely populated PCBs. The inductor's self-resonant frequency (typically above 30MHz) ensures stable operation in high-frequency switching circuits.

Application Areas

Primary applications include point-of-load (POL) converters in telecom equipment, voltage regulator modules (VRMs) for processors, and power management in automotive electronics. The inductor is commonly used in buck, boost, and buck-boost converter topologies. In consumer electronics, it finds use in laptop power supplies, LED drivers, and portable devices. Industrial applications include motor drives, power inverters, and renewable energy systems. The component's reliability and small footprint make it particularly valuable in space-constrained applications where board real estate is at a premium.

Maintenance and Precautions

While power inductors are generally maintenance-free, proper handling during assembly is crucial. Avoid mechanical stress during placement as this may damage the internal structure. The component should be stored in dry conditions (≤40°C, ≤90% RH) and used within 12 months of manufacture. During PCB design, maintain adequate clearance from heat-generating components. Follow the manufacturer's recommended soldering profile to prevent thermal damage. The inductor should not be subjected to currents exceeding its saturation rating, as this will significantly reduce its inductance and potentially cause circuit malfunction.

B2B Procurement Guide

When sourcing the VLS4012ET-4R7M, verify the manufacturer's part number and specifications match your requirements. Lead times typically range from 8-12 weeks for standard orders, though some distributors may stock inventory. Minimum order quantities (MOQs) usually start at 3,000 pieces for standard pricing. For high-volume applications (50,000+ units), negotiate pricing with authorized distributors or directly with manufacturers. Consider requesting samples for performance verification before large-scale procurement. Always ensure suppliers provide authentic components, as counterfeit inductors may not meet specified performance or safety standards.