Pulse Transformers

Part Number	Description / PDF	Quantity
H5008FNLT PulseLarsen Antenna	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	3413
S558-5999-W2-F Bel Fuse, Inc.	MODULE XFRMR LAN 10/100B-TX SMD	1743
T1142NLT PulseLarsen Antenna	XFRMR T1/E1/CEPT/ISDN-PRI 1:2.4	0
749010013 Würth Elektronik Midcom	TRANSFORMER LAN 10/100 SMD	3743
PE-65723NLT PulseLarsen Antenna	TRANSFORMER 2000VRMS 75UH SMD	0
7490220121 Würth Elektronik Midcom	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	288
G4818CG Mentech Technology USA Inc.	DUAL LAN XFMR 1000 BASE-T	180
XFBMC29-DIP027-B XFMRS	XFMR BATT MGMT AEC-Q200	0
G4802CG Mentech Technology USA Inc.	DUAL LAN XFMR 1000 BASE-T	300
C2268FNL PulseLarsen Antenna	PULSE XFMR 1:1 7.5UH	0
78613/16MC-R Murata Power Solutions	PULSE XFMR 1CT:1 4MH	0
IT260 Schaffner EMC, Inc.	XFRMR PULSE 3:1 SGL 12MH .1A	675
TLA-6T406-T TDK Corporation	TRANSFORMER LAN 10/100 TX	5
IL-20-0001 Schurter	IL5 PULSE TRANSFORMER THT 0.25A	409
QC1553-81 PulseR (iNRCORE	TRANSFORMER PBC	0
10GB-6012XNLT PulseR (iNRCORE	LAN MODULE XFRMR 10GBASE-T SMD	0
R5012NLT PulseR (iNRCORE	XFRMR ETHERNET MOD IND 1000B-T	0
TLA-3T108LF TDK Corporation	TRANSFORMER LAN 1:1TR 75UH 16SOP	0
SM453230-181N7Y J.W. Miller / Bourns	CHIP LAN XFMR,1 /2.5/5G,4.7X3.2X	2000
PA2008NL PulseLarsen Antenna	PULSE XFMR 2:1:1 1.43MH	3896

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