Rubycon Capacitors — Premium Aluminum Electrolytic Capacitors
Founded in 1952 in Nagano, Japan, Rubycon is a world leader in aluminum electrolytic capacitors. Known for exceptionally low ESR, long life, and high reliability, Rubycon capacitors are the preferred choice for servers, power supplies, and industrial applications. Specap stocks current and hard-to-find Rubycon series.
Authorized Rubycon Sourcing
Genuine Rubycon capacitors sourced through verified distribution channels — no counterfeits, no relabeled parts.
Cross-Reference Support
Match discontinued Rubycon part numbers to current-production series or compatible alternatives from other manufacturers.
Full Series Coverage
Inventory spanning ZLH, YXG, MBZ, USG, ZL, and MCZ series for power supply, server, telecom, and industrial applications.
Fast Shipping
Same-day shipment support on eligible in-stock items with expedited delivery options.
The History of Rubycon Corporation
Rubycon Corporation was founded in 1952 in Ina City, Nagano Prefecture, Japan. From its inception, the company chose to focus exclusively on aluminum electrolytic capacitors — a strategic decision that set it apart from diversified competitors like Nichicon, Nippon Chemi-Con, and Panasonic. This singular focus has allowed Rubycon to refine its electrolyte formulations, foil etching processes, and sealing technologies to an exceptional degree.
Over seven decades, Rubycon has earned a reputation for consistency and reliability that few manufacturers can match. Engineers across industries — from data center power architects to industrial automation designers — routinely specify Rubycon capacitors by name, confident in their performance under demanding conditions. The company's proprietary electrolyte technology delivers class-leading ESR, leakage current, and lifespan ratings.
Rubycon remains an independent, active manufacturer today, continuing to develop new series optimized for emerging applications in LED lighting, automotive electronics, renewable energy, and high-density server power systems.
Popular Rubycon Capacitor Series
| Series | Type | Common Applications | Key Specification |
|---|---|---|---|
| ZLH | Ultra Low Impedance | Switch-mode power supplies, DC-DC converters | Ultra low ESR, 105°C, 6,000–10,000h |
| YXG | Long Life | Industrial controls, medical devices, LED drivers | 12,000-hour life at 105°C |
| MBZ | High Ripple Current | High-power supplies, inverters, motor drives | High ripple current rating, 105°C |
| MCZ | High Reliability | Server power, telecom rectifiers, base stations | 10,000h life, low ESR, high reliability |
| USG | Miniature | Compact electronics, IoT devices, adapters | Small footprint, 105°C, low impedance |
| ZL | Standard Low Impedance | General-purpose power supplies, consumer electronics | Low impedance, 105°C, cost-effective |
Industries Served by Rubycon Capacitors
Rubycon's exclusive focus on aluminum electrolytic capacitors has made them a preferred supplier across industries where reliability and performance are non-negotiable:
- Server & data center power — Rubycon MCZ and ZLH series are widely used in server power supplies and hot-swap modules where continuous uptime and thermal endurance are critical.
- Telecom infrastructure — Base station rectifiers, power shelves, and telecom power systems rely on Rubycon's high-reliability series for years of maintenance-free operation.
- Industrial automation — PLC power supplies, variable frequency drives, and industrial motor drive capacitors benefit from Rubycon's high ripple current and long life ratings.
- Power supply manufacturing — OEM power supply manufacturers specify Rubycon for their consistent electrical parameters and tight tolerance control across production lots.
- LED lighting — Long-life Rubycon series like YXG are ideal for LED driver circuits that must operate continuously for years in commercial and industrial lighting installations.
- Automotive electronics — Rubycon supplies capacitors rated for the extended temperature ranges and vibration resistance required in automotive power management systems.
Why Source Rubycon Capacitors from Specap?
With over 40 years in the capacitor business, Specap provides reliable access to Rubycon's full product range along with expert support:
- Current-production Rubycon series in stock and ready to ship
- Access to discontinued and hard-to-find Rubycon part numbers through our global sourcing network
- Cross-reference support to match older Rubycon series to current replacements or compatible alternatives
- Every capacitor is electrically tested and inspected before shipping — no counterfeits, no relabeled parts
Whether you need a single reel of ZLH capacitors for a prototype or volume quantities of MCZ series for production, Specap delivers genuine Rubycon parts with the technical support to ensure you get the right capacitor for your application.
Frequently Asked Questions
Where can I buy Rubycon capacitors?
Specap stocks a wide range of Rubycon aluminum electrolytic capacitors including the ZLH, YXG, MBZ, and MCZ series. We source from authorized channels and maintain inventory for both current production and hard-to-find part numbers.
What makes Rubycon capacitors special?
Rubycon focuses exclusively on aluminum electrolytic capacitors, unlike diversified competitors. This specialization results in consistently high quality, exceptionally low ESR, low leakage current, and extended operational life — often exceeding 10,000 hours at rated temperature. Many engineers specify Rubycon by name for critical power supply and server applications.
What are the best Rubycon series for power supplies?
For switch-mode power supplies, the ZLH (ultra low impedance) and MBZ (high ripple current) series are top choices. The YXG series offers 12,000-hour life ratings ideal for high-reliability PSU designs, while the MCZ series is preferred for server and telecom power systems requiring maximum uptime.
Does Specap stock discontinued Rubycon series?
Yes. Some older Rubycon series have been discontinued and replaced by newer product lines. Specap maintains inventory of legacy Rubycon parts and provides cross-reference support to match discontinued part numbers to current-production equivalents with compatible specifications.
Related Sourcing Paths
Use these pages to find related products, request quotes, and explore capacitor sourcing options.