S558-5999-46-F Bel Magnetic Solutions Transformer (Small Outline Packages) In Stock

Name: S558-5999-46-F
Brand: Bel Magnetic Solutions
SKU: S558-5999-46-F
Availability: InStock

Bel Magnetic Solutions S558-5999-46-F is a surface-mount Ethernet isolation transformer for 10/100 BASE-T applications with 420 µH primary inductance and 1500 V isolation voltage. It provides galvanic isolation and common-mode rejection in a small outline SMT package for network interface designs.

ACTIVETransformerVerified Jun 2026

Package / Visual Reference

S558-5999-46-FSmall Outline Packages

Quick Facts

Manufacturer: Bel Magnetic Solutions
Package: Small Outline Packages
Pin Count: 16
Lifecycle: ACTIVE
Datasheet: S558-5999-46-F Datasheet PDF
Category: Transformer
Price: From $1.6270(MOQ 25)
Temp Range: ?°C to 70.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of S558-5999-46-F?

Designed for 10/100 BASE-T Ethernet with 420 µH primary inductance meeting IEEE 802.3 magnetics requirements
1500 V isolation voltage providing galvanic isolation between network cable and system circuitry
Surface-mount small outline package 5.969 mm height enabling integration into compact NIC and switch designs
Single-function (1 port) design simplifying layout for single-channel Ethernet isolation stages
Lead-free RoHS-compliant construction suitable for modern automated SMT reflow assembly processes

What is S558-5999-46-F used for?

S558-5999-46-F is used as the isolation transformer in 10/100 BASE-T Ethernet physical layer (PHY) circuits in network interface cards, industrial Ethernet switches, and embedded networking modules. The 1500 V isolation voltage protects downstream circuitry from surge transients on the network cable, meeting IEEE 802.3 magnetics isolation requirements. It is suited for router, PLC, and IoT gateway designs where a single-port surface-mount Ethernet transformer is needed in a space-efficient footprint.

What are the specifications of S558-5999-46-F?

Pbfree Code	Yes
Factory Lead Time	12Weeks
YTEOL	7
Application	10/100 BASE-T
Height	5.969mm
Isolation Voltage	1500V
Mounting Feature	SURFACE MOUNT
Number of Functions	1
Primary Inductance	420 µH
Surface Mount	YES
Transformer Type	DATACOM TRANSFORMER
Package	Small Outline Packages

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
ECCN	EAR99

Where can I find the S558-5999-46-F datasheet?

S558-5999-46-F Datasheet Download

Official datasheet from Bel Magnetic Solutions

What are equivalent replacements for S558-5999-46-F?

No known alternates. Submit an RFQ and our team can suggest alternatives.

Frequently Asked Questions

What isolation voltage does S558-5999-46-F provide, and does it meet IEEE 802.3 Ethernet requirements?

S558-5999-46-F provides 1500 V isolation voltage between the network cable side and the PHY chip side, which meets the minimum 1500 V RMS isolation required by IEEE 802.3 for 10/100 BASE-T Ethernet magnetics. This protects the connected microprocessor or switch IC from cable surge events and common-mode transients on the line.

How does the 420 µH primary inductance of S558-5999-46-F affect 10BASE-T and 100BASE-TX signal quality?

The 420 µH primary inductance is above the IEEE 802.3 minimum of 350 µH at 100 kHz, ensuring low insertion loss and adequate common-mode rejection at the 10 MHz and 100 MHz carrier frequencies used by 10BASE-T and 100BASE-TX. Higher primary inductance reduces magnetizing current and improves return loss, which is critical for achieving the template mask compliance in Ethernet transmit waveforms.

What should procurement teams know about lead time and sourcing risk for S558-5999-46-F in a networking product?

S558-5999-46-F carries a 12-week factory lead time from Bel Magnetic Solutions, reflecting the custom-wound nature of Ethernet transformers. For products requiring single-port 10/100 BASE-T isolation, buyers should evaluate the Bel S558 series family for alternate MPNs and maintain at least 8 to 12 weeks of safety stock to avoid production gaps given the long replenishment cycle.

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About Bel Magnetic Solutions

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Qty.	Unit Price	Ext. Price
25+	$2.7624	$69.06
50+	$2.6784	$133.92
100+	$2.5962	$259.62
300+	$2.0700	$621.00
600+	$1.6470	$988.20
900+	$1.6270	$1464.30