Pulse Transformers

Part Number	Description / PDF	Quantity
QT1553-20 PulseR (iNRCORE	TRANSFORMER PBC	0
R1022NLT PulseR (iNRCORE	XFRMR ETHERNET MOD IND 10/100B-T	0
78602/3JC-R Murata Power Solutions	PULSE XFMR 1:1:1 180UH	0
IT245 Schaffner EMC, Inc.	XFRMR PULSE 1:1 SGL 8MH .1A	122
PA1323NL PulseLarsen Antenna	PULSE XFMR 1:1 600UH	0
SMQC1553-6 PulseR (iNRCORE	TRANSFORMER PULSE DUAL RATIO	0
78604/4JC Murata Power Solutions	XFRMR 2:1 4VUS SMD TOROID	49
PE-68786NL PulseLarsen Antenna	TRANSFORMER TELECOM DUAL T1/E2	0
HX6096NL PulseLarsen Antenna	PULSE XFMR 1CT:1CT TX/RX	1756
78604/3JC-R Murata Power Solutions	PULSE XFMR 2:1 160UH	0
H1100NL PulseLarsen Antenna	XFRMR MAGNETIC 1PORT 2:1 10/100	0
PA0173NL PulseLarsen Antenna	PULSE XFMR 1:1:1 980UH	1399
EPG4260S-LF PCA Electronics, Inc.	POE DATA XFM, 1.15A	250
78602/8MC-R Murata Power Solutions	PULSE XFMR 1:1:1 1MH	0
QT1553-22 PulseR (iNRCORE	TRANSFORMER PBC	0
PE-65540NL PulseLarsen Antenna	XFRMR 64KBPS 1CT:1 10MH T/H	0
1000B-5002FNL PulseR (iNRCORE	XFMR MODULE SNGL 1GB SMT PBC	19
H5187NL PulseLarsen Antenna	XFRMR MODULE 1000B-T 1 CH SMT	231
QC1553-45 PulseR (iNRCORE	TRANSFORMER PBC	0
HU4108NLT PulseLarsen Antenna	MDL, SIN 2.5G, 1:1, SMT	0

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