Pulse Transformers

Part Number	Description / PDF	Quantity
7490220122 Würth Elektronik Midcom	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	834
78613/16MC Murata Power Solutions	PULSE XFMR 1CT:1 4MH	0
S558-5999-AN-F Bel Fuse, Inc.	MODULE XFRMR GIGABIT MINIPCI SMD	1834
H5120NLT PulseLarsen Antenna	MODULE MAGNETIC 1PORT 1000BASE-T	0
78601/2JC-R Murata Power Solutions	PULSE XFMR 1:1 350UH	927
H2006ANLT PulseLarsen Antenna	XFRMR MAGNT MOD 2PORT POE 10/100	1980
PA1558NLT PulseLarsen Antenna	PULSE XFMR 11.5UH	0
G504 Tamura	TRANSFORMER 0.05MH 1:1:1 PULSE	0
SPOE3-3312 Signal Transformer	POE POWER OVER ETHERNET EP7 CORE	0
HM1238NLT PulseLarsen Antenna	MDL, SIN, XFMR-CMC, 1:1, 4.3KV,	0
G512 Tamura	TRANSFORMER 2.0MH 2CT:1CT PULSE	123
Q1553-85 PulseR (iNRCORE	TRANSFORMER PBC	0
PE-65728NLT PulseLarsen Antenna	TRANSFORMER 2000VRMS 100UH SMD	4289
78613/1MC-R Murata Power Solutions	PULSE XFMR 1CT:1 2MH	0
S558-5999-U7-F Bel Fuse, Inc.	MODULE XFRMR LAN 10/100B-TX SMD	25138
78615/8JC-R Murata Power Solutions	PULSE XFMR 1CT:1CT 1MH	0
ALT4532-171-T001 TDK Corporation	XFRMR LAN 1CT:1CT 170UH	3952
78615/1JC Murata Power Solutions	PULSE XFMR 1CT:1CT 1.7MH	145
78604/2JC-R Murata Power Solutions	PULSE XFMR 2:1 500UH	0
DA102C Murata Power Solutions	DIGITAL AUDIO TX 1:1 3MH DIP	1807

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