Holly-Ohm | Precision Passive Components & Electron-Beam Welding Alloy Resistors Manufacturer

About Holly-Ohm

Foshan Haoyun Electric Accessory Co., Ltd — a manufacturer wholly-owned by Foshan Vistong Electronics Co., Ltd — has been a trusted supplier of high-quality, precise alloy resistors and shunts since 2004. With over two decades of experience, we deliver reliable passive components to customers worldwide.

Our advanced production equipment, mature manufacturing lines, automated workshops, and robust management systems ensure consistent quality and performance across every product we produce.

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Why Choose Us?

800M+

Pieces Annual Output

20+

Years Manufacturing Experience

18,000+

Square Meters Plant Area

The Best Applications

Automobile

High-reliability shunts for EV battery management systems, motor control, and onboard charging units.

Industry

Robust resistors for industrial automation, power supplies, inverters, and heavy-duty current sensing.

Home Appliance

Precision components for smart appliances, HVAC systems, and energy-efficient electronics.

Featured Products

WSMP Series

High power & excellent weather resistance
Ultra-low thermal EMF and parasitic inductance
Suitable for high-frequency AC current detection
Electron-beam welding technology

HYCS Series

M4 thread hole design
Low thermal EMF down to <3μV/°C
Power rating up to 50W
AEC-Q200 qualified (available)
Patented pin structure for ultra-low resistance sensing

Bare Chip Resistor

Bare Chip Resistors

Direct thermal path for efficient heat dissipation
Compact footprint for space-constrained designs
High stability and reliability
RoHS compliant

Epoxy SMD Chip

Epoxy SMD Chip Resistors

Surface-mount design for automated assembly
Moisture and chemical resistance
Stable performance under thermal cycling
Wide range of resistance values

PACS SHUNT

High temperature resistance
Overload current up to 500A
Max tightening torque: 10N
Robust for industrial and automotive use

WSNL Series

All-metal structure
Vulcanization and weather resistance
Surface pickling & passivation treatment
Ultra-low parasitic inductance
Fast response for high-frequency detection

WSKM Series

Kelvin 4-terminal connection
Precise current sensing
Parasitic inductance down to 1nH
Ideal for BMS and power monitoring

HYUS Series

Large current sensing capability
Ultra-low resistance values
AEC-Q200 qualified (available)
RoHS compliant
Used in BMS, battery formation, and inverters

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Trusted by Global Industries

20+

Years of Experience

800M+

Units Produced Annually

18,000+

m² Manufacturing Space

50W

Max Power Rating

Frequently Asked Questions

What are electron-beam welding alloy resistors?

These are high-precision resistors manufactured using electron-beam welding technology, ensuring superior thermal stability, low parasitic inductance, and excellent long-term reliability.

Are your products AEC-Q200 qualified?

Yes, several of our product lines, including HYCS and HYUS series, are available with AEC-Q200 qualification for automotive applications.

Do you offer custom shunt resistor designs?

Yes, we support OEM/ODM services and can customize resistance values, power ratings, mounting styles, and more based on your application needs.

Are your components RoHS compliant?

Yes, all our products are RoHS compliant and meet international environmental and safety standards.

Get in Touch

For quotes, technical support, or partnership inquiries, visit our official website to connect with our team.

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Precision Passive Components for Demanding Applications