Pulse Transformers

Part Number	Description / PDF	Quantity
7490140123B Würth Elektronik Midcom	WE-LAN 10/100 BASE-T SMT TRANSFO	0
750316093 Würth Elektronik Midcom	GATE DRIVE TRANSFORMER	691
HM1237NL PulseLarsen Antenna	XFMR CMC MODULE AECQ BATT MNGT	125
1016C Murata Power Solutions	PULSE XFMR 1:1 3MH	0
SM91072AL-E J.W. Miller / Bourns	XFMR LAN 10/100 BASE-T 1:1 350UH	574
78601/4C Murata Power Solutions	PULSE XFMR 1:1 67UH	40
78602/2MC Murata Power Solutions	PULSE XFMR 1:1:1 500UH	48
749053013 Würth Elektronik Midcom	TRANSFORMER LAN	250
TQ1553-71 PulseR (iNRCORE	TRANSFORMER 1553-71 PBC	0
HCTSM80304BAL-E1 J.W. Miller / Bourns	XFRMR POWER 3:4 300UH SMD	393
E2467NLT PulseLarsen Antenna	XFRMR ISOL 10BASE-T 1:2 SMD	599
H5084NL PulseLarsen Antenna	MODULE MAGNETIC 1PORT 1000BASE-T	490
PA1267NLT PulseLarsen Antenna	XFRMR 3.3V 11W 155.5UH POE EP13	0
77201C Murata Power Solutions	PULSE XFMR 1:1 1MH	19
S558-5999-AZ-F Bel Fuse, Inc.	MODULE XFRMR GIGABIT MINIPCI SMD	2093
BX4285LNL PulseLarsen Antenna	PULSE XFMR 1.4:1 16MH	0
78613/9JC-R Murata Power Solutions	PULSE XFMR 1CT:1 10MH	1096
78602/9MC-R Murata Power Solutions	PULSE XFMR 1:1:1 10MH	0
XFBMC29D-BA09-B XFMRS	XFMR BATT MGMT AEC-Q200	0
T-1250SCT PulseR (iNRCORE	XFMR DUAL 1250M BAUD	753

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