Pulse Transformers

Part Number	Description / PDF	Quantity
7490100111 Würth Elektronik Midcom	TRANSFORMER LAN 10/100 SMD	0
750316928 Würth Elektronik Midcom	PUSH-PULL TRANSFORMER EP5 SMT; F	1318
749053012 Würth Elektronik Midcom	TRANSFORMER LAN	0
749020023A Würth Elektronik Midcom	XFRMR LAN 1000 BASE-T 1:1 350UH	80
7490220122 Würth Elektronik Midcom	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	834
750510730 Würth Elektronik Midcom	DIGITAL TRANSFORMER	138
749020011A Würth Elektronik Midcom	TRANSFORMER LAN 10/100/1000 SMD	343
749022015 Würth Elektronik Midcom	TRANSFORMER LAN 10/100/1000 SMD	213
750510173 Würth Elektronik Midcom	XFRM WE-DSL ISDN DAUGHTERBRD	174
749020100A Würth Elektronik Midcom	WE-LAN 10/100/1000 BASE-T SMD	1005
749024012 Würth Elektronik Midcom	TRANSFORMER WE-LAN 10/100/1000BT	435
749014011 Würth Elektronik Midcom	TRANSFORMER WE-LAN MED 10/100BT	460
749050017 Würth Elektronik Midcom	TRANSFORMER LAN	419
749022011 Würth Elektronik Midcom	TRANSFORMER LAN 10/100/1000 POE	6628
750510231 Würth Elektronik Midcom	DIGITAL TRANSFORMER	0
749023016 Würth Elektronik Midcom	WE-LAN 10/100/1000 BASE-T SMT TR	0
749014013 Würth Elektronik Midcom	TRANSFORMER WE-LAN MED 10/100BT	0
760301105 Würth Elektronik Midcom	XFRMR GATE DRIVE 1:1:1 SMD	1307
749052012 Würth Elektronik Midcom	TRANSFORMER LAN	0
750510348 Würth Elektronik Midcom	VDSL XFRM WE-DSL IKANOS BOARD	0

Pulse Transformers

1. Overview

Pulse transformers are specialized electromagnetic devices designed to transfer electrical pulse signals between circuits while maintaining galvanic isolation. They play a critical role in modern electronics by enabling efficient signal transmission, voltage level conversion, and noise suppression. Their unique ability to handle fast transient signals makes them essential in power electronics, telecommunications, and industrial control systems.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Signal Pulse Transformer	High bandwidth, fast rise time (ns level), low distortion	Digital communication interfaces (RS485, Ethernet)
Power Pulse Transformer	High voltage isolation (>1kV), high efficiency (>90%)	Switch-mode power supplies (SMPS), motor drives
High-Voltage Pulse Transformer	Multi-kV insulation, partial discharge resistance	X-ray generators, radar systems
Wideband Pulse Transformer	Frequency range: 100kHz-100MHz, flat response curve	RF amplifiers, test equipment

3. Structure and Components

Typical construction includes:

Primary/secondary windings: Enamelled copper wire with precise turn ratio
Magnetic core: Ferrite (high permeability), powdered iron (high saturation)
Insulation system: Multi-layer dielectric barriers, vacuum pressure impregnation
Termination: Surface-mount pads or through-hole pins

Advanced designs use planar transformers with PCB-integrated windings for improved thermal management.

4. Key Technical Parameters

Parameter	Typical Range	Importance
Turns Ratio	1:1 to 1:100	Voltage scaling accuracy
Frequency Range	100kHz-10MHz	Signal integrity maintenance
Isolation Voltage	500V-30kV	Safety compliance (UL/IEC)
Pulse Rise Time	1ns-50ns	Digital signal fidelity
Leakage Inductance	<1 H	Efficiency optimization

5. Application Fields

Power Electronics: Isolated gate drivers for IGBT/MOSFET
Telecommunications: DSL line interface units
Medical Equipment: Patient-isolated monitoring systems
Industrial Control: PLC signal transmission
Automotive: EV battery management system (BMS) isolation

Case Study: In electric vehicle chargers, pulse transformers enable 1500V isolation between grid and battery systems while maintaining 98% signal integrity at 2MHz switching frequency.

6. Leading Manufacturers

Manufacturer	Key Product Series	Specifications
Coilcraft	Pulse-Hi Series	1:1.4 ratio, 25kV isolation, 100MHz bandwidth
Pulse Electronics	PA1538NL	1:16 ratio, 3kV isolation, 100ns rise time
TDK-Lambda	CUT100	2.5kV isolation, 2MHz frequency, SMD package

7. Selection Guidelines

Key considerations:

Match turns ratio with driver/receiver voltage requirements
Verify insulation class against system safety standards
Check frequency response vs. signal bandwidth requirements
Consider thermal rating for continuous power operation
Evaluate PCB footprint constraints (through-hole vs SMD)

8. Industry Trends

Current development directions include:

Miniaturization through nanocrystalline core materials
Integration with EMI filtering components
Increased operating frequencies (>10MHz) for 5G infrastructure
SiC/GaN compatible designs for wide bandgap power devices
Automotive-grade models for 800V EV systems