Pulse Transformers

Part Number	Description / PDF	Quantity
VST10/9EE-202S2P4 TDK Corporation	TRANSFORMERS FOR BMS	370
TLA-3T106LF TDK Corporation	TRANSFORMR LAN 1:1TR 130UH 16SOP	0
ALT4532M-201-T001 TDK Corporation	XFRMR LAN 1CT:1CT 200UH	18979
VGT10/9EE-X03S2P4 TDK Corporation	PULSE TRANSFORMERS FOR BMS (BATT	306
VGT10/9EE-X01S1P4 TDK Corporation	PULSE TRANSFORMERS FOR BMS (BATT	777
ALT4532-171-T001 TDK Corporation	XFRMR LAN 1CT:1CT 170UH	3952
ALT4532P-181-T05G TDK Corporation	PULSE TRANSFORMERS FOR LAN INTER	0
TLA-8T104WLF-T TDK Corporation	PULSE XFMR 1 CT:1CT TX/RX 350UH	0
VST10/9EE-205S1C2 TDK Corporation	CURRENT SENSE TRANSFORMERS, WOUN	485
TLA-6T120LF TDK Corporation	XFRMR FOR LOGIC 80220 CS 16SOP	0
VGT10/9EE-204S2P4 TDK Corporation	TRANSFORMERS FOR BMS	419
TLA-3T107LF TDK Corporation	XFRMR LAN 1:1.41TR 130UH 16SOP	0
TLA-6T211A TDK Corporation	XFRMR LAN 1CT:1CT 350UH 16SMD	0
TLA-6T121LF TDK Corporation	XFRMR FOR AM79C973 CHIPSET 16SOP	0
TLA-6T406-T TDK Corporation	TRANSFORMER LAN 10/100 TX	5
TLA-3T108LF TDK Corporation	TRANSFORMER LAN 1:1TR 75UH 16SOP	0
ALT4532-201-T001 TDK Corporation	XFRMR LAN 1CT:1CT 200UH	4311
TLA-6M103LF TDK Corporation	INTEGRATED FILTER MODULE 16SOP	0
TLA-6T404 TDK Corporation	XFRMR FOR BCM5208,5203 CS 40SOP	0
TLA-3T101LF TDK Corporation	TRANSFORMR LAN 1:1TR 100UH 16SOP	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