UniOhm Thick Film Resistors: A Complete Guide to Series, Part Numbers, and Applications
When specifying passive components for a new design, UniOhm—the international brand of Taiwan-founded resistor manufacturer UNI-ROYAL—deserves a serious look. Established in 1978, the company has grown into one of the more capable resistor suppliers serving automotive, industrial, medical, and consumer electronics markets worldwide .
UniOhm Thick Film Resistors: A Complete Guide to Series, Part Numbers, and Applications
When specifying passive components for a new design, UniOhm—the international brand of Taiwan-founded resistor manufacturer UNI-ROYAL—deserves a serious look. Established in 1978, the company has grown into one of the more capable resistor suppliers serving automotive, industrial, medical, and consumer electronics markets worldwide . This article walks through UniOhm's product families, part-number logic, technical characteristics, applications, and where the brand sits in today's competitive resistor landscape.
About UNI-ROYAL / UniOhm
UNI-ROYAL started operations in 1978 and set up its mainland China production base in Kunshan in 1992 . Today the group runs manufacturing sites in Kunshan, Xiamen, Huaian, and Thailand, with four sub-brands under its umbrella: ROYALOHM, UNIOHM, FOSS, and AEON . The product portfolio spans electronic materials, surface-mount resistors, through-hole resistors, and specialty resistor types , supported by certifications including ISO9001, ISO14001, IATF16949, and AEC-Q200 .
With nearly five decades of process know-how, UNI-ROYAL has positioned itself as a credible alternative to Japanese and European resistor brands while maintaining cost structures that work for high-volume production.
Product Family Overview
UniOhm's resistor catalog is organized into six main categories :
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Thick film chip resistors – the broadest line, covering general-purpose, high-value, high-power, ultra-high-power, high-voltage, anti-sulfuration, anti-surge, low-TCR, LED-strip, wide-terminal, ESD-protected, non-magnetic, fully lead-free, and automotive-grade variants
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Thin film chip resistors – focused on the high-precision TC series
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Metal alloy low-resistance resistors – foil, wide-terminal foil current-sense, metal strip, metal-film low-ohm, and shunt types
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Through-hole resistors – carbon film, metal film, metal oxide film, wire-wound, and fusible types
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Power resistors – cement, aluminum-housed, wire-wound, and metal-glaze film parts
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Custom resistors – application-specific designs such as ASSY, HFWR, PHF0, TFRC, CTR, QHO, KNHW, GRM0/GRM1, HDWR, and MPCR
Part Number Structure and Key Series Codes
UniOhm's standard SMD resistor part number follows a "package + power + tolerance + resistance + packaging" format. Power is encoded as WA (1/10 W), W8 (1/8 W), W4 (1/4 W), and so on; tolerance uses D (±0.5%), F (±1%), J (±5%); and suffixes like T5E indicate tape-and-reel packaging at 5,000 pieces per reel, lead-free .
The function-based series codes are summarized below:
|
Code
|
Description
|
Representative Types
|
|---|---|---|
|
HP
|
High-power thick film chip
|
HP02, HP03, HP05, HP06, HP07, HP10, HP11, HP12
|
|
SP
|
Ultra-high-power thick film chip
|
SP10, SP12, SP17, SP20, SP27
|
|
HV
|
High-voltage thick film chip
|
HV03, HV05, HV06, HV07, HV10, HV12
|
|
AS
|
Anti-surge thick film chip
|
—
|
|
PS
|
High-precision anti-surge thick film chip
|
—
|
|
LT
|
Low-TCR thick film chip
|
LT02, LT03, LT05, LT06
|
|
LE
|
Flex LED strip chip
|
LE05, LE06
|
|
WR
|
Wide-terminal thick film chip
|
WR08, WR12, WR18, WR20, WR25
|
|
ES
|
Anti-ESD thick film chip
|
ES01, ES02, ES03, ES05, ES06, ES07
|
|
NM
|
Non-magnetic thick film chip
|
NM02, NM03, NM05, NM06, NM12
|
|
PF
|
Fully lead-free thick film chip
|
PF0A, PF01–PF07, PF10–PF12
|
|
TC
|
High-precision thin film chip
|
TC02, TC03, TC05, TC06, TC07, TC10, TC12
|
|
MS
|
Metal foil chip
|
MS05, MS06, MS07, MS10, MS12
|
|
LR
|
Metal strip chip
|
LR06, LR10, LR12
|
|
RS
|
Chip shunt
|
RS12, RS21, RS31
|
|
CQ
|
Automotive-grade thick film chip
|
CQ01, CQ02, CQ03, CQ05, CQ06, CQ07, CQ10, CQ12
|
|
HQ
|
Automotive high-power thick film chip
|
HQ02, HQ03, HQ05, HQ06, HQ07, HQ10, HQ12
|
|
CS
|
Automotive low-resistance thick film chip
|
CS02, CS03, CS05, CS06, CS07, CS10, CS11, CS12
|
|
NQ
|
Anti-sulfuration automotive chip
|
NQ01, NQ02, NQ03, NQ05, NQ06, NQ07, NQ10, NQ12
|
|
NS
|
Premium anti-sulfuration automotive chip
|
NS01, NS02, NS03, NS05, NS06, NS07, NS10, NS12
|
Through-hole lines use their own designators: CFR/CPR (carbon film), MF (metal film), MOR (metal oxide film), KNP/KNH/KNS (wire-wound), KNPN (non-inductive wire-wound), KNPA (anti-surge wire-wound), KNPU (fusible wire-wound), WPR (power wire-wound), TFR (thermal-fusing wire-wound), and PRW/PRM/PRS/PRT/PRU (cement resistors) .
Technical Characteristics
Across the catalog, several traits stand out:
Broad package coverage. From 01005 through 2512, UniOhm covers essentially every mainstream SMD footprint. The 01005–0402 range targets space-constrained portables; 0603–1206 serves as the workhorse for consumer and industrial boards; 1210–2512 handles power management and inverter-stage current sensing .
Reflow and wave solder compatibility. Most thick film chip series support both reflow and wave soldering, fitting standard SMT lines without special process adjustments .
Automotive reliability. AEC-Q200-qualified parts operate across −40 °C to +125 °C and resist sulfuration and humidity, meeting under-hood and cabin electronics requirements .
Strong anti-sulfuration performance. Anti-sulfuration grades pass ASTM B809 testing, making them suitable for chemical plants, mining equipment, and exhaust-system electronics where silver electrodes would otherwise corrode .
Flexible precision. Tolerance options run from ±5 % down to ±0.1 %, and thin film TC series achieve temperature coefficients as low as ±5 ppm/°C for instrumentation and medical signal chains .
Where These Resistors Actually Go
UniOhm lists ten application verticals on its site: automotive, industrial, power, home appliances, computer peripherals, communications, lighting, medical, new energy, and electrical equipment . Mapping series to use cases:
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Consumer electronics – General-purpose 0402/0603/0805 thick film parts in phones, tablets, set-top boxes, and wearables for power regulation, audio drive, and RF matching
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Automotive – CQ/HQ/CS/NQ/NS AEC-Q200 grades in ECUs, BMS modules, ADAS, and LED headlamp drivers
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Industrial control – SP ultra-high-power and AS anti-surge series in PLCs, servo drives, and VFDs handling large currents and pulse loads
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Medical – TC thin film and NM non-magnetic parts in ECG, ultrasound, and MRI signal paths where noise and drift must stay minimal
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Communications – HV high-voltage and LT low-TCR series in 5G base-station RF modules and optical transceiver bias circuits
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LED lighting – LE flex-strip and SP ultra-high-power parts driving high-brightness LEDs directly
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New energy – LR/MS alloy low-resistance series for current sensing in PV inverters and storage systems, held to ±1 % or tighter
Competitive Position and Strengths
UniOhm occupies the "full-catalog, value-tier" slot between premium Japanese/European brands (Vishay, KOA, Rohm) and low-cost domestic makers. Pricing is more aggressive than Japanese equivalents while quality clears the bar that smaller regional suppliers often miss.
Four strengths define the positioning:
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Catalog depth – From 01005 chips to large power resistors, including automotive and anti-sulfuration grades, almost any design requirement has a matching part
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Batch consistency – Automated sorting combined with AOI and X-ray inspection keeps placement yields high
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Automotive credentials – Dual AEC-Q200 and IATF16949 backing makes UniOhm a safe pick for localizing previously imported BOMs
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Supply stability – Multi-site manufacturing across Kunshan, Xiamen, Huaian, and Thailand smooths lead-time risk
Against peers like Yageo and Walsin, UniOhm's edge lies in the depth of its specialized lines—particularly automotive-grade and anti-sulfuration products.
Sourcing Recommendation: Shenzhen Shunhai Technology Co., Ltd.
If you're evaluating UniOhm resistors for an upcoming project, Shenzhen Shunhai Technology Co., Ltd. is worth contacting as a distribution partner. The company maintains a long-standing relationship with UNI-ROYAL and stocks the full range from standard thick film chips to AEC-Q200 anti-sulfuration automotive parts.
Practical reasons to work with Shunhai:
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Ready stock – Popular footprints (0402/0603/0805/1206) in common resistance values ship quickly, which helps when prototypes need fast turnaround
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Automotive series available to order – CQ, HQ, CS, NQ, NS and other certified grades can be reserved against project demand
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Engineering support – Cross-reference checking, alternate-part suggestions, and sample requests are handled during the selection phase
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Traceable sourcing – Original manufacturer documentation accompanies shipments, reducing exposure to refurbished or pulled parts in the open market
Whether you need small mixed batches for prototype validation or volume pricing for mass production, Shunhai Technology can provide quotes and technical backup for the full UniOhm resistor lineup.