Pulse Transformers

Part Number	Description / PDF	Quantity
R4009NLT PulseR (iNRCORE	XFRMR ETHERNET MOD IND 10/100B-T	0
QC1553-25 PulseR (iNRCORE	TRANSFORMER PBC	0
750510174 Würth Elektronik Midcom	XFRM VX180-IFE6 ISDN DAUGHTERBRD	0
76601/2C Murata Power Solutions	XFRMR 1:1 492UH 8.5VUS B	398
HX5401NL PulseLarsen Antenna	XFRMR MODL 4PORT POE GIGABIT	1537
2337824-2 TE Connectivity AMP Connectors	DISCRETE ETHERNET MAGNETICS DUAL	350
750510572 Würth Elektronik Midcom	WE-DSL TRANSFORMER	0
B78476A8248A003 TDK EPCOS	PULSE XFMR 1CT:1CT 350UH	1070
78613/4MC Murata Power Solutions	PULSE XFMR 1CT:1 67UH	0
ALAN-1002-T Abracon	PULSE XFMR 1CT:1 350UH	0
78613/4JC Murata Power Solutions	PULSE XFMR 1CT:1 50UH	104
G2405CG Mentech Technology USA Inc.	SINGLE LAN XFMR 1000 BASE-T	400
749013011 Würth Elektronik Midcom	TRANSFORMER LAN 10/100 POE SMD	333
XFBMC29-BA09-E XFMRS	XFMR BATT MGMT AEC-Q200	2073
1000B-5001 PulseR (iNRCORE	TRANSFORMER MODULE SMD	0
ALT4532M-201-T001 TDK Corporation	XFRMR LAN 1CT:1CT 200UH	18979
HX5014NLT PulseLarsen Antenna	TRANSFORMER MODULE GIGABIT 2PORT	0
2337822-4 TE Connectivity AMP Connectors	DISCRETE ETHERNET MAGNETICS SING	727
HX6080NLT PulseLarsen Antenna	PULSE XFMR 1 CT:1CT TX/RX 350UH	0
PE-68515LNL PulseLarsen Antenna	XFRMR MODULE 1PORT 1:1 10/100B-T	88

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