Pulse Transformers

Part Number	Description / PDF	Quantity
78615/8MC Murata Power Solutions	PULSE XFMR 1CT:1CT 1MH	300
B78476A8317A003 TDK EPCOS	PULSE XFMR 1CT:1CT 350UH	0
H5008FNL PulseLarsen Antenna	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	952
H6062FNLT PulseLarsen Antenna	PULSE XFMR 1CT:1CT TX 1CT:1CT RX	1037
78602/16MC-R Murata Power Solutions	PULSE XFMR 1:1:1 4MH	0
HU4108NL PulseLarsen Antenna	MODULE MAGNETIC SNGL 2.5GB SMT	0
IT370 Schaffner EMC, Inc.	XFRMR PULSE 1:1 SINGLE 0.3MH 1A	262
HU4102NL PulseLarsen Antenna	MODULE MAGNETIC DUAL 2.5GB SMT	0
T3002NLT PulseLarsen Antenna	XFRMR T3/DS3/E3/STS-1 1:2CT SMD	0
H5008NL PulseLarsen Antenna	MODULE GIGABIT LAN 24SOIC 1PORT	360
SMQC1553-10 PulseR (iNRCORE	TRANSFORMER PULSE DUAL RATIO	0
1000B-5001NL PulseR (iNRCORE	XFMR CHOKE SHUNT QUAD 100 NPB	0
0553-0013-BC-F Bel Fuse, Inc.	MODULE XFRMR LAN T1/E1 PCB	680
SMQT1553-7 PulseR (iNRCORE	TRANSFORMER PULSE DUAL RATIO	0
T60403D4721X002 VACUUMSCHMELZE GmbH & Co. KG.	GATE DRIVE TRANSFORMER PTH 1:1 5	764
DA101JC-R Murata Power Solutions	DIGITAL AUDIO TX	12061
HM2112ZNLT PulseLarsen Antenna	XFMR CMC MODULE AECQ BATT MNGT	0
H2019NL PulseLarsen Antenna	MODULE XFRMR VOIP SGL LAN 16SOIC	1464
H1102NL PulseLarsen Antenna	MODULE XFRMR SGL ETHR LAN 16SOIC	12003
750031353 Würth Elektronik Midcom	TRANSFORMER SI3210 SI3211SMD	136

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