Shielded vs Unshielded Power Inductor: When Do You Need a Shielded Inductor?
A shielded power inductor surrounds its winding with magnetic material, such as a drum core inside a ferrite sleeve, so most of its magnetic field returns throu
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Selection guides, cross-reference reviews and engineering Q&A for LAN transformers, RJ45, SFP and other communication components, plus the latest from VOOHU.
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Inductor Saturation Current vs Rated Current (Isat vs Irms): Which Do You Check First?
Saturation current (Isat) and rated current (Irms) limit different things, so a power inductor has to pass both checks. Isat is the DC current at which inductan
Creepage vs Clearance in Transformer Isolation Design
Clearance is the shortest distance through air between two conductive parts. Creepage distance is the shortest path between the same two parts along the surface
Unidirectional vs Bidirectional TVS Diode: Which One Does Your Line Need?
A unidirectional TVS diode clamps surges in one direction only: when the line goes positive past its breakdown voltage it clamps, and when the line goes negativ
What Is a Pulse Transformer? What It Is Used For and How It Differs from a Power Transformer
A pulse transformer is a small transformer built to carry fast pulses or digital data across an isolation barrier while keeping the pulse shape, rather than to
Common Mode vs Differential Mode Noise: How to Tell Them Apart and Which Filter Stops Each
Differential mode noise travels the same way as the wanted signal or supply current: out on one conductor and back on the other. Common mode noise flows in the
How to Design a Single Pair Ethernet (SPE) Interface: Magnetics, PoDL and Connectors
Design a Single Pair Ethernet port: DC-blocking caps, common mode choke, optional isolation transformer, PoDL coupling and IEC 63171 connector choice.
What Is Single Pair Ethernet (SPE)? PHY Types, Cable Reach and the 2026 Standards
Single Pair Ethernet (SPE) runs Ethernet over one twisted pair. Compare 10BASE-T1L (1,000 m), 10BASE-T1S, 100BASE-T1 and the 2026 802.3da and 802.3dg.
Water Still Getting into a Waterproof RJ45 After Installation? IP65 vs IP67, Panel Thickness and the Mated State
Outdoor cameras, EV chargers and industrial gateways fitted with a waterproof RJ45 can still take in water after rain or a spray test. This article walks throug
Selection GuidesMII vs RMII vs RGMII vs SGMII: Which MAC-to-PHY Interface Should You Use?MII vs RMII vs RGMII vs SGMII: Which MAC-to-PHY Interface Should You Use?
MII vs RMII vs RGMII vs SGMII: data width, clock and pin count (RGMII 12 pins, SGMII 1.25 Gbps serial), and how to pick the MAC-to-PHY interface.
Tech BlogWhat Is a Gas Discharge Tube (GDT)?What Is a Gas Discharge Tube (GDT)? How It Works, How to Read Its Datasheet and How to Pair It with a TVS Diode
What a gas discharge tube (GDT) is, how it fires and how to read its datasheet, with 2- and 3-electrode parts from 90 V to 400 V and TVS pairing tips.
Tech BlogSFP Connector PinoutSFP Connector Pinout: 20-Pin Host Connector Pin Definitions for SFP and SFP+
SFP connector pinout: all 20 host pins per INF-8074i and SFF-8431, why pin 9 differs on SFP+, and 4.7 to 10 kΩ pull-ups for Tx_Fault, Mod_ABS and LOS.
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