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Pulse Transformers

Image Part Number Description / PDF Quantity Rfq
QT1553-25

QT1553-25

PulseR (iNRCORE

TRANSFORMER PBC

0
SMG1553-61

SMG1553-61

PulseR (iNRCORE

TRANSFORMER 1553 SINGLE PBC

0
QT1553-23

QT1553-23

PulseR (iNRCORE

TRANSFORMER PBC

0
10GB-6011XNLT

10GB-6011XNLT

PulseR (iNRCORE

LAN MODULE XFRMR 10GBASE-T SMD

0
Q1553-45

Q1553-45

PulseR (iNRCORE

TRANSFORMER PULSE LVL:M PKG:A

248
1000B-5014FT

1000B-5014FT

PulseR (iNRCORE

XFMR MODULE DUAL 1GD SMT PBC

246
T-1485SCT

T-1485SCT

PulseR (iNRCORE

XFMR DUAL 1485M BAUD

1376
SMQ1553-70

SMQ1553-70

PulseR (iNRCORE

TRANSFORMER 1553-70 PBC

0
10GB-6010NLT

10GB-6010NLT

PulseR (iNRCORE

LAN MODULE XFRMR 10GBASE-T SMD

0
Q1553-3

Q1553-3

PulseR (iNRCORE

TRANSFORMER PBC

0
SMQ1553-45

SMQ1553-45

PulseR (iNRCORE

TRANSFORMER PULSE DUAL RATIO

94
Q1553-25

Q1553-25

PulseR (iNRCORE

TRANSFORMER PBC

0
QT1553-20

QT1553-20

PulseR (iNRCORE

TRANSFORMER PBC

0
R1022NLT

R1022NLT

PulseR (iNRCORE

XFRMR ETHERNET MOD IND 10/100B-T

0
SMQC1553-6

SMQC1553-6

PulseR (iNRCORE

TRANSFORMER PULSE DUAL RATIO

0
QT1553-22

QT1553-22

PulseR (iNRCORE

TRANSFORMER PBC

0
1000B-5002FNL

1000B-5002FNL

PulseR (iNRCORE

XFMR MODULE SNGL 1GB SMT PBC

19
QC1553-45

QC1553-45

PulseR (iNRCORE

TRANSFORMER PBC

0
1000B-5003FT

1000B-5003FT

PulseR (iNRCORE

XFMR MODULE DUAL 1GD SMT PBC

246
R5003NL

R5003NL

PulseR (iNRCORE

XFRMR ETHERNET MOD IND 1000B-T

120

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

TypeFunctional FeaturesApplication Examples
Signal Pulse TransformerHigh bandwidth, fast rise time (ns level), low distortionDigital communication interfaces (RS485, Ethernet)
Power Pulse TransformerHigh voltage isolation (>1kV), high efficiency (>90%)Switch-mode power supplies (SMPS), motor drives
High-Voltage Pulse TransformerMulti-kV insulation, partial discharge resistanceX-ray generators, radar systems
Wideband Pulse TransformerFrequency range: 100kHz-100MHz, flat response curveRF 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

ParameterTypical RangeImportance
Turns Ratio1:1 to 1:100Voltage scaling accuracy
Frequency Range100kHz-10MHzSignal integrity maintenance
Isolation Voltage500V-30kVSafety compliance (UL/IEC)
Pulse Rise Time1ns-50nsDigital signal fidelity
Leakage Inductance<1 HEfficiency 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

ManufacturerKey Product SeriesSpecifications
CoilcraftPulse-Hi Series1:1.4 ratio, 25kV isolation, 100MHz bandwidth
Pulse ElectronicsPA1538NL1:16 ratio, 3kV isolation, 100ns rise time
TDK-LambdaCUT1002.5kV 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
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