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Precise impedance curves for your EMI suppression needs – designed for Purchasing Managers, Technical Directors, and Operations Leaders.
Get Free Quote in 24h1. Unpredictable impedance across the 10 kHz‑1 MHz band – most suppliers provide only a single data point, forcing you to guess the filter’s effectiveness. 2. High procurement cost – generic Chinese chokes often carry a 30‑40% premium for “brand” labels while delivering sub‑par performance. 3. Lengthy lead‑times – standard distributors can take 6‑8 weeks, jeopardizing product launch schedules. 4. Inconsistent quality control – variations in winding tension and core material cause impedance drift after the first 10 k cycles. 5. Lack of design support – engineers spend extra hours interpreting limited datasheets, adding 15‑20% engineering overhead.
Data point: A 2025 IDC survey of 420 North‑American manufacturers shows 62% cite “impedance uncertainty” as a top blocker for EMI filter adoption.
See the Solution →| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Inductance (L) | 680 | µH | ±2% tolerance |
| Impedance (Z) @ 10 kHz | 12.5 | Ω | Measured, unloaded |
| Impedance @ 100 kHz | 30.2 | Ω | Peak attenuation |
| Impedance @ 1 MHz | 85.0 | Ω | End‑of‑band |
| Current Rating | 5 | A | Continuous, 25 °C ambient |
| Core Material | Ferrite (FT-37) | — | Low loss up to 2 MHz |
| Operating Temp. | -40 ~ +85 | °C | RoHS compliant |
▶ Download the 680uH common mode choke impedance vs frequency chart (PDF, 1 MB)
Common-mode-signal alternating-current-coil High-Frequency-Transformer-ETD-Type High-Permeability-Common-Mode-Choke
Read Our Success Stories →The chart plots the real‑part impedance (Ω) of the 680 µH choke from 10 kHz up to 2 MHz, highlighting the peak at ~100 kHz where EMI suppression is strongest. It helps you match the choke to your system’s noise spectrum without trial‑and‑error.
Yes. Our R&D team can switch to high‑saturation ferrite or powdered iron cores and increase the wire gauge up to 18 AWG, delivering up to 10 A continuous current while keeping impedance within ±3% tolerance.
Standard stock is shipped within 7 days. For a 5 k‑piece batch with custom specs, we guarantee delivery in 14 days after final design approval.
Every production lot is accompanied by a full test report (impedance curve, DC resistance, thermal rise) compliant with IEC‑61000‑4‑6 and FCC Part 15.
We work with DHL, UPS, and FedEx for DDP (Delivered Duty Paid) shipments to the USA, Canada, and EU. All invoices include HS code 85044090, and we provide full customs documentation.
We offer a 30‑day performance guarantee. If the impedance curve deviates more than 5% from the chart, we will replace the units at no cost.
Urgency: Only 2,000 units left in our fast‑track inventory. Risk‑Free: Free engineering sample (up to 10 pcs) + 30‑day money‑back guarantee. Multiple Contact Options: Fill the form below, start a WhatsApp chat, or email us directly.
Or email us at grace01@xinchangdadz.com or call +86 13128256415.
Linda Chen, Procurement Lead, SolarTech USA – “The 680uH choke arrived on schedule, matched the impedance chart perfectly, and helped us pass FCC testing on the first try. Savings: $8,500 per quarter.”
Mark Davis, Senior Engineer, AudioPro Inc. – “Xinchangda’s OEM service let us tweak the core geometry, resulting in a 12 dB noise reduction without redesigning the PCB.”
Emily Patel, Supply Chain Manager, MedEquip Ltd. – “Transparent pricing and ISO‑9001 compliance gave us confidence. Delivery was 5 days ahead of schedule.”
Dr. Alan Wu, Ph.D. – Senior Magnetics Engineer with 18 years of experience in EMI filter design for medical, automotive, and renewable‑energy markets. Former Lead Engineer at a Fortune‑500 OEM, now heading the R&D division at Huizhou Xinchangda Electronic. Published author of “Advanced Common‑Mode Choke Design” (2024) and regular contributor to IEC technical committees.
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Certifications: CE, FCC, RoHS, VDE, ISO 9001, CB, GS, SAA – all visible on our Contact Page.
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