About SUSAN Capacitor
Built in Dongguan.
Trusted Worldwide.
SUSAN is a factory-direct manufacturer of aluminum electrolytic capacitors headquartered in Dongguan, China. With 1,000 staff and fully automated production lines, we supply OEM and ODM solutions to brand owners and manufacturers across the United States, Europe, and beyond.
Our Story
A factory built around the spec sheet, not around the sale.
SUSAN was founded with a single conviction: the performance figures printed on a capacitor datasheet should be the performance you measure on your board. Too often, procurement teams discover that real-world ESR, ripple tolerance, and lifetime diverge from what was promised at the quote stage.
We invested in fully automated winding, aging, and testing equipment specifically to close that gap. Every lot that leaves our Dongguan facility is traceable, tested, and documented -- so your engineering team spends time designing products, not chasing component failures.
Today we serve procurement managers and engineers at brand owners, contract manufacturers, and R&D companies across North America and Europe, delivering mid-range pricing without sacrificing the process discipline that high-reliability applications demand.
Factory capabilities that back every delivery commitment
Request factory audit →Fully Automated Production
End-to-end automated winding, stacking, assembly, and aging lines eliminate human error from the critical steps that determine ESR and lifetime performance.
Multi-Stage Quality Control
Every lot undergoes 100% electrical screening plus statistical sampling for capacitance, ESR, leakage current, and withstand voltage before shipment.
OEM & ODM Customization
Custom capacitance, voltage, sleeve color, lead pitch, and terminal configuration. Low MOQ supported -- we work with both prototype runs and high-volume orders.
Reliable Delivery Schedules
Automated lines and managed raw-material inventory mean we hold lead-time commitments. Standard series ship within 72 hours for samples; bulk orders on agreed schedules.
Strong R&D Capability
In-house electrolyte formulation and electrode material research allow us to adapt specifications for new applications -- particularly PD fast-charging and high-frequency inverter designs.
1,000-Person Workforce
A large, trained, and stable workforce supports surge capacity without compromising process discipline. Technical staff are available for pre-sales engineering support.
Five product lines. One qualified source.
Full parametric search →General-purpose and high-ripple series for a wide range of applications.
Wet electrolyte construction for high-capacitance energy storage.
Polymer solid electrolyte for ultra-low ESR and extended lifetime.
High ripple-current handling for SMPS and inverter DC-link stages.
Surface-mount series for compact, high-density PCB layouts.
Markets We Serve
Designed for the applications that demand the most.
Our capacitors are specified into products where performance variance causes real-world failures -- from charger explosions to production line downtime.
High-frequency switching environments require low ESR and stable capacitance under thermal stress. Our fast-charge series is optimized for GaN and SiC converter topologies.
Primary marketConsumer and industrial charger manufacturers require compact form factors, consistent lot-to-lot performance, and RoHS compliance at competitive price points.
Primary marketMotor drives, inverters, and power supplies in appliances depend on capacitors that survive thermal cycling and high ripple over a 10+ year product life.
Primary marketBulk capacitance and energy hold-up for SMPS, server PSUs, and uninterruptible power systems where ripple rating and ESR directly affect efficiency.
Growing segmentWhy SUSAN
What procurement managers tell us matters most.
We asked our customers what went wrong with their previous capacitor supplier. The answers shaped our factory investment priorities.
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Stable, predictable performance
Automated production and 100% electrical screening mean the spec on the datasheet matches the part in the bag -- every lot, not just the qualification sample.
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Delivery you can plan around
Managed raw-material inventory and automated lines let us hold lead-time commitments even during supply chain disruptions. 72-hour sample shipment is a standard, not a promise.
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Customization without high MOQ
OEM and ODM runs are available from prototype quantities. We adapt capacitance, voltage, sleeve, lead pitch, and terminal configuration to your BOM -- not the other way around.
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Prompt technical response
Our engineering team responds to specification queries same business day. Cross-reference, derating guidance, and application notes are included -- no consulting fee.
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Mid-range pricing, not mid-range quality
Factory-direct supply and automated production keep unit costs competitive without reducing process discipline or material quality.
The principles that run the factory
Process Discipline Over Price Pressure
We do not cut corners on electrolyte formulation, aging time, or testing coverage to win a lower unit cost. If a spec cannot be met at a given price, we say so before the PO is placed.
Transparency at Every Stage
Lot test data, material certificates, and production records are available on request. We support factory audits and third-party inspection as standard practice, not an exception.
Engineering Partnership
We treat procurement and engineering contacts as long-term partners. Application support, derating advice, and cross-reference assistance are part of the relationship -- not a premium service tier.
Continuous R&D Investment
New power topologies -- GaN converters, SiC inverters, bidirectional EV chargers -- push capacitor requirements forward. Our in-house R&D team tracks these shifts and updates our product roadmap accordingly.
Delivery as a Commitment
We staff and inventory to meet the schedule we quote. When disruptions occur, we communicate early and propose alternatives -- not excuses.
Compliance Without Exceptions
RoHS 3, REACH, and ISO 9001 are baseline requirements, not differentiators. We maintain compliance documentation current and audit-ready at all times.
Send us your spec. We'll send back the part number.
Datasheets, samples, cross-reference support, and application guidance -- typically same business day. Factory-direct, no intermediary markup.
Dongguan, Guangdong, China
Factory-direct supply, no intermediary