jbcapacitors blog

In power electronics, procurement delays from well-known capacitor brands often extend delivery from weeks to months. For manufacturers requiring a DC link capacitor short lead time, such delays can disrupt production, increase costs, and damage customer trust. Many engineering teams are now seeking an alternative to EPCOS DC link capacitor to secure reliable sourcing.

A Practical Alternative – JFQP DC Link MKP Film Capacitors

The JFQP series from jb Capacitors addresses both performance and delivery challenges. These metallized polypropylene film capacitors feature short lead times, high ripple current handling, and low ESR/ESL. With an operating range of −40°C to +105°C and voltage ratings from 500 VDC to 1200 VDC, they are suitable for DC-Link, coupling, and filtering applications.

Engineering Insight: ESR, dv/dt, and Design Life

In DC-Link circuits, low ESR reduces heat generation under high ripple currents, directly extending capacitor lifespan and system reliability. High dv/dt tolerance enables safe operation under fast transients, especially with high-speed IGBT or SiC MOSFET switches. Choosing capacitors with the right ESR, dv/dt, and thermal endurance helps ensure long-term stability and fewer maintenance cycles.

Application Examples

• Solar Inverters – maintaining stable DC bus voltage under fluctuating inputs
• Industrial Motor Drives – filtering and storage in high-load switching environments
• EV Charging Stations – ensuring efficiency and reliability in continuous operation
• High-End Power Supplies – delivering clean, stable output for sensitive systems

In pulse applications, engineers face a tough challenge: selecting a capacitor that not only withstands high voltage surges but also maintains stability over time without failure. jb Capacitors’ JFG Axial Film Capacitor Series is engineered exactly for this.

Whether you’re designing switching power supplies, audio crossovers, or pulse discharge circuits, finding a durable, low-loss, self-healing axial film capacitor makes a critical difference. That’s where the jb JFG series stands out — offering both cycloidal and flat oval structures across polyester (PET) and polypropylene (PP) film types to match your precise requirements.

What Makes jb JFG Capacitors Ideal for Pulse Circuits?

• High Pulse Endurance: Low dissipation factor and excellent self-healing capability ensure reliability in surge-heavy environments.
• Wide Capacitance Range: 0.01µF to 68µF, with voltage ratings up to 1250VDC.
• Flexible Structures: Cycloidal (JFGA/JFGC) or Flat Oval (JFGB/JFGD), optimizing PCB layout and heat dissipation.
• Material Options: PET for general use, PP for high-frequency or high-voltage applications.

Applications That Rely on Pulse-Ready Capacitors

Common applications that benefit from pulse film capacitors include:

• Pulse forming networks
• Flash circuits
• High-energy discharge circuits
• Resonant power converters
• EMI/RFI suppression

Thanks to their compact size and axial lead design, jb JFG capacitors are especially suitable for tight mechanical constraints while maintaining superior insulation resistance and dielectric stability.

How to Choose Between Cycloidal and Flat Oval?

Both designs offer excellent electrical properties, but the structure you choose affects layout and cooling:

• Cycloidal: Ideal when space along one axis is less limited.
• Flat Oval: Better for height-constrained or high-density boards.
• Polypropylene (JFGC/JFGD): Recommended for high-frequency switching to minimize energy loss.

Datasheets & Ordering Info

🔍 View full specs and download datasheets →

Have a project in mind? Contact us at info@jbcapacitors.com for samples or custom solutions.