Product Overview
The SYT18-L18MB is one of JIULI's best EMI suppression components. It works seamlessly with our popular High-frequency Transformer and Switching Power Supply Transformer lines.
We build it with high-performance ferrite cores and precise windings. That means it blocks more noise across a wide range of frequencies. It holds up in tough industrial settings, too. It’s a great match for our other power management parts, including our Ring Electronic Transformer solutions.
Technical Specs
- Inductance: 10mH ±20%
- Rated Current: 18A DC
- DC Resistance: Max 8.5mΩ per winding
- Saturation Current: At least 35A DC
- Operating Temp: -40°F to +257°F
- Storage Temp: -67°F to +302°F
- Insulation Resistance: ≥100MΩ at 500VDC
- Dielectric Strength: 2500VAC for 60 seconds
- Size: 38mm (L) × 30mm (W) × 28mm (H)
- Weight: About 55 grams
- Mounting: Through-hole PCB
Product Images & Videos
Want to see it work? Ask for our technical video. It shows the SYT18-L18MB in action, including tests with JIULI's High Frequency Electrical Transformer in different setups.
Features & Advantages
How It Works
The SYT18-L18MB has two symmetric windings around a high-permeability ferrite core. When noise flows through both windings the same way, it creates a strong magnetic field that blocks the noise. But normal current flows in opposite directions, so the fields cancel out—meaning little to no signal loss.
Key Features
- Blocks noise across a wide range: Works from 10kHz to 30MHz, better than most industry standards
- Handles high current: 18A rated, with a 35A saturation point—good for heavy-duty industrial use
- Works with our transformers: Fits perfectly with JIULI's Switching Power Supply Transformer line
Why It’s Better Than Others
Compared to standard common-mode inductors, the SYT18-L18MB blocks 25% more noise and runs 18% cooler under full load. Our special core material keeps it working consistently, even when voltage changes. It handles sudden spikes better and lasts longer than competitors.
How to Install & Use
- Before you install: Make sure your setup stays between -40°C and +125°C. Check that the inductor’s size and current rating fit your circuit.
- Mounting: Place it on the PCB where you planned. Keep it away from heat sources. Tighten fasteners to 0.9N·m (8 in-lbs).
- Wiring: Connect power lines to the marked terminals—follow the polarity. Leave at least 3mm space between this part and others.
- Pairing with transformers: When using with JIULI's High-frequency Transformer, put the inductor close to the transformer’s output. This blocks the most noise.
- Testing: After installing, check for continuity and insulation before powering up. Test EMC compliance to make sure noise is reduced.
Where to Use It
The SYT18-L18MB works in many industries, like:
- Industrial power supplies and inverters—especially with JIULI's High Frequency Electrical Transformer
- Telecom gear and data center power systems
- EV charging stations and battery management systems
- Factory automation and control systems
- Aerospace and defense electronics with strict EMI rules
In all these uses, it helps meet international EMC standards and makes systems more reliable.
What It Does for You
- Meets global standards: Helps you hit CISPR, FCC, and IEC rules
- Lowers development costs: It’s pre-tested, so you spend less on EMC testing and redesigns
- Makes products more reliable: Cuts down on EMI-related failures, so fewer warranty claims and service calls
- Boosts efficiency: Low resistance design uses up to 15% less power than competitors
- Easy to integrate: Works with standard circuits and our transformers
- Saves money long-term: Lasts 100,000+ hours
Certifications & Compliance
The SYT18-L18MB meets or beats these international standards:
- CE Certification
- RoHS 2.0 Compliance
- UL 94 V-0 Flammability Rating
Custom Options
JIULI makes tailored versions for your specific needs. Here’s what we can adjust for the SYT18-L18MB:
- Inductance values from 5mH to 50mH (with tight tolerance options)
- Current ratings from 5A to 30A for special uses
- Different terminal setups and lead lengths
- Surface-mount versions for automated assembly
- High-temp versions (up to +155°C) for extreme environments
- Combined solutions with custom Ring Electronic Transformer designs
Our engineers will help through the whole process to make sure your custom part works perfectly.
How We Make It & Check Quality
We follow strict steps to make sure every SYT18-L18MB works well and lasts:
- Materials: We pick top ferrite cores and high-purity copper wire—only from trusted suppliers
- Core prep: We machine and treat cores to make their magnetic properties better and reduce loss
- Winding: Computer-controlled machines wind the wire—so turns are exact and tension is even
- Assembly: Robots put it together, with cameras checking alignment and connections
- Coating: We use epoxy resin under controlled heat and pressure to seal it
- Electrical tests: Every unit gets checked for inductance, resistance, and dielectric strength
- Environmental tests: We sample units to test temperature cycling, vibration, and humidity resistance
- Packaging: Anti-static packaging with labels to track each part through its life
What Customers Say
European Industrial Electronics GmbH: "The SYT18-L18MB helped our power supplies meet strict EU EMC rules. When we paired it with JIULI's High-frequency Transformer, we got compliance 30% faster than with our old setup." – Maria Schmidt, R&D Manager
American Power Systems Inc.: "We’ve used JIULI's common-mode inductors in our renewable energy inverters for over three years. They’re consistent, perform well, and cut our field failures by 40%." – James Wilson, Engineering Director
Asian Electronics Manufacturing Co.: "The custom options let us make a compact power solution we couldn’t get with standard parts. Their tech support team really knows their stuff." – Kenji Tanaka, Product Manager
Common Questions
What is the difference between common mode inductor and differential mode inductor?
Common-mode inductors block noise that flows the same way through both wires. Differential-mode ones block noise between two wires. The SYT18-L18MB is made to block common-mode noise in power lines.
Can I use this with non-JIULI transformers?
Yes. It’s optimized to work with JIULI's Switching Power Supply Transformer, But it also fits most standard transformers and power supply components.
How long does it take to get one?
Standard SYT18-L18MB inductors take 2-3 weeks. Custom versions take 4-6 weeks, depending on what you need and how many you order.
Do you offer samples for testing?
Yes, for qualified customers. Contact our sales team to get samples and tech datasheets.