Comprehensive Analysis of SUSUMU Resistor Series
I. Brand Introduction
SUSUMU (Susumu Co., Ltd.) was founded in 1964 and is headquartered in Kyoto, Japan. It is the world's first manufacturer to produce and sell thin film resistors, with over 60 years of thin film resistor manufacturing history. As a pioneer in thin film resistor technology, SUSUMU focuses on thin film technology as its core competency, specializing in the development of high-precision, high-reliability resistor products, and holds over 70% of the global thin film resistor market share.
The company's product portfolio includes chip resistors, chip networks, precision resistor networks, chip inductors, delay lines, power chokes, and current sensors. SUSUMU is certified to ISO 9001, ISO 14001, and IATF 16949 international quality management systems. Its customers include globally renowned companies such as Samsung, Toshiba, and Haier. In China, SUSUMU operates through Susumu International Trading (Shanghai) Co., Ltd., handling sales and technical support for mainland China and Hong Kong.
II. Product Numbering and Naming Convention
SUSUMU resistor model numbers follow a rigorous coding system, allowing quick identification of technical parameters, series affiliation, and core characteristics through combinations of letters and numbers.
Typical Model Format: Series ID + Package Size + Resistance Value Code + Tolerance/TCR + Packaging Form
Example: RG1220M-R039-F-T5:
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RG: Series ID (Ultra-precision thin film resistor)
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1220: Package size (1.2mm × 2.0mm, corresponding to 0805 package)
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M: Tolerance grade (±1%)
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R039: Resistance value (0.039Ω)
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F: Packaging form (Tape & Reel)
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T5: TCR grade (±50ppm/℃)
Field Breakdown:
| Field | Description | Example |
|---|---|---|
| Series ID (2-3 letters) | Identifies product series | RG, RGV, NRG, KRL, RR |
| Package Size (4 digits) | First two: length; last two: width (inches ×100) | 1220 → 0805 package |
| Resistance Code (1 letter + 3 digits) | R = decimal point; no letter = integer | R039=0.039Ω; 100=100Ω |
| Tolerance/TCR | Tolerance letter + TCR code | T5=±50ppm/℃; T1=±25ppm/℃ |
| Packaging (1 letter) | F=Tape & Reel; B=Bulk | F for automated SMT |
Special models: Anti-sulfur versions add "-S" suffix (e.g., KRL6432E-M-R010-F-T5-S); AEC-Q200 qualified models are noted in datasheets.
III. Major Product Series Overview
SUSUMU's resistor portfolio spans from general-purpose precision resistors to specialized application resistors. Detailed analysis of each major series follows.
1. RG Series — Precision Thin Film Resistor Benchmark
Product Number: Begins with "RG", e.g., RG1005P-472-B-T5, RG3216P-2490-B-T1
Characteristics: SUSUMU's most popular metal thin film chip resistor series, known for high precision, high reliability, and long-term stability. Tolerance as low as ±0.02% to ±0.05%, TCR as low as ±2ppm/℃ to ±5ppm/℃. Uses alumina ceramic substrate and nickel-chromium alloy film with thickness of approximately 0.1 microns. Inorganic passivation technology enables high precision and reliability. Thin film-based terminal technology contains no silver (Ag), providing sulfur imperviousness.
Applications: Medical equipment (CT scanners), precision instruments (spectrometers), automotive ECU systems, industrial measurement instruments, communication equipment.
Advantages: Ultra-high precision, ultra-low TCR, excellent long-term stability, anti-sulfur, low noise, good high-frequency performance.
Market Positioning: SUSUMU's flagship precision series, targeting high-end precision measurement and control markets.
2. RR Series — General-Purpose Precision Resistors
Product Number: Begins with "RR", e.g., RR0816P-101-B-T5, RR0510P-473-D
Characteristics: General-purpose precision metal thin film chip resistors with excellent performance in tolerance, TCR, frequency response, noise, and linearity. Resistance range 1Ω to 10MΩ, tolerance ±0.1% to ±1%. Available in 0603, 0805 and other packages for automated SMT production. RR0306 series (0201 package) offers 10Ω to 22kΩ range.
Applications: Communication equipment, home appliances, consumer electronics, power modules — cost-sensitive general-purpose scenarios.
Advantages: High cost-performance ratio, reliable precision, rich package options, suitable for high-volume automated production.
Market Positioning: Mid-range general-purpose market, balancing cost and performance.
3. URG Series — Ultra-High Precision Resistors
Product Number: Begins with "URG"
Characteristics: Precision upgrade of RG series, combining tight tolerance, low drift, and strong environmental stability. Absolute tolerance as low as ±0.01%, TCR as low as ±2ppm/℃. Low noise: -25dB to -35dB, high-frequency performance up to 1GHz. Anti-sulfur performance, operating range -75℃ to 175℃. Available in 0603, 0805, 1206 packages.
Applications: Precision industrial instrumentation, laboratory-grade scales and balances, high-precision sensors, medical electronics, automotive and ADAS sensors, smart sensing nodes, IoT platforms.
Advantages: Industry-leading precision, extremely low TCR, wide-temperature stability, anti-sulfur, low noise.
Market Positioning: Ultra-high precision niche, targeting laboratory-grade and high-end industrial measurement.
4. RGV Series — High-Voltage Automotive-Grade Resistors
Product Number: Begins with "RGV"
Characteristics: Developed for electric vehicles and industrial high-voltage scenarios, AEC-Q200 certified. Resistance range 120kΩ to 4.3MΩ (1210 package supports 1000V). TCR ±25ppm/℃, tolerance ±0.1%. Inorganic passivation film improves long-term stability by 30%.
Applications: New energy vehicle BMS, high-voltage DC charging stations, EV powertrains, industrial robotics, measurement instruments, high-voltage equipment.
Advantages: Automotive-grade certified, high-voltage tolerance, high reliability, excellent long-term stability.
Market Positioning: Automotive electronics and industrial high-voltage applications.
5. NRG Series — Medical-Grade Anti-Magnetic Interference Resistors
Product Number: Begins with "NRG"
Characteristics: Made from non-magnetic materials, designed for medical electronics and strong magnetic field environments. TCR as low as ±5ppm/℃, resistance range 10Ω to 1MΩ, power rating 1/16W to 1/4W. Inorganic protective film ensures long-term stability; thin film structure achieves high-grade low-noise characteristics. Structure prevents sulfur particle accumulation, avoiding sulfide corrosion and solder joint detachment. Operating range -55℃ to 155℃. Lead-free and halogen-free, RoHS compliant.
Applications: MRI equipment, laboratory precision measurement instruments, medical electronics, electronic systems in strong magnetic field environments.
Advantages: Non-magnetic material, anti-magnetic interference, ultra-low TCR, anti-sulfur, excellent long-term reliability.
Market Positioning: Medical electronics and scientific instrumentation high-end market.
6. KRL Series — High-Current Sensing Expert
Product Number: Begins with "KRL", e.g., KRL3264E-C-R039-F-T5
Characteristics: High-current sensing metal foil low-resistance chip resistors with short-side terminal structure. Resistance range 5mΩ to 1000mΩ, power coverage 0.2W to 5W. Available in Type C (high-temperature operation, up to 175℃) and Type M (low EMF, up to 155℃). TCR ±50ppm/℃. Available in Type D (bottom terminal) and Type E (wrapped terminal). Multiple size options from 0510 to 50110.
Applications: Automotive electronics (EV BMS current monitoring), AC/DC and DC/DC converters, motor drives, inverters, office automation equipment.
Advantages: High-current handling, wide resistance and power selection, excellent temperature stability, broad compatibility, custom services available.
Market Positioning: High-current sensing specialist, targeting automotive electronics and industrial power supply sectors.
7. PRG Series and HRG Series — High-Power Resistors
Product Number: Begins with "PRG" or "HRG"
Characteristics: PRG series features long-side terminals; HRG series features short-side wrap-around terminals. HRG series handles up to 1W in standard EIA 3216 (1206 inch) package. Tolerance ±0.1% or ±0.5%, TCR ±25ppm/℃ or ±50ppm/℃. Low noise, excellent high-frequency performance. Drift ≤±0.25% after 1,000 hours at rated power at 70℃. AEC-Q200 qualified.
Applications: Power supplies, power switching, automotive braking systems, test and measurement equipment, motor deflection circuits, sensor circuits, batteries, EV chargers.
Advantages: High power density, miniaturized packaging, automotive-grade certified, high reliability.
Market Positioning: High power density applications, meeting both miniaturization and high-power requirements.
8. Anti-Sulfur Series (RGQ/RGW/RGZ/RGH)
Characteristics:
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RGQ Series: Optimized noise performance on top of anti-sulfur base; suitable for audio equipment, medical instruments, high-end communication equipment
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RGW Series: Designed for high-power applications with excellent thermal stability and heat dissipation; suitable for automotive electronics, industrial machinery
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RGZ Series: Ultra-thin design for space-constrained applications like smartphones and wearables
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RGH Series: Optimized for high-frequency circuits with extremely low parasitic inductance and capacitance; suitable for RF modules, wireless communication equipment
Market Positioning: Anti-sulfur requirements across various scenarios — audio, high-power, ultra-thin, high-frequency.
9. Other Series
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RL/PRL Series: Milliohm-level power resistors for high-power current sensing, resistance as low as 0.001Ω
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RGT/RGA Series: Wide operating temperature and high reliability series
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MRG Series: Anti-surge series
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RS Series: Audio-grade resistors
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RM Series: Precision resistor networks
IV. Core Technical Advantages
SUSUMU resistors' technical strengths can be summarized as follows:
Thin Film Technology: Vacuum sputtering and laser trimming processes ensure precision and long-term stability. Sputtered uniform thin film provides stable electron flow, high precision, low TCR, and minimal current drift.
Material Innovation: Manganese copper alloys, metal foils, and other materials enhance high-temperature resistance and oxidation resistance.
Inorganic Passivation: All products employ inorganic passivation technology for high precision and high reliability.
Anti-Sulfur Technology: Thin film-based terminal technology contains no silver (Ag), providing inherent sulfur imperviousness.
Vertical Integration: Full-process control from materials to packaging ensures product consistency.
V. Application Areas Overview
SUSUMU resistors cover the following major application areas:
| Area | Specific Applications | Recommended Series |
|---|---|---|
| Automotive Electronics | BMS, ECU, ADAS sensors, onboard chargers | RGV, KRL, RG, HRG |
| Medical Equipment | MRI, CT scanners, precision measurement | NRG, URG, RG |
| Industrial Automation | Inverters, motor drives, power modules | KRL, PRG/HRG, RR |
| Communications | 5G base stations, RF modules | RGH, RG, RR |
| Consumer Electronics | Smartphones, wearables, home appliances | RGZ, RR, RL |
| Precision Instruments | Laboratory equipment, test & measurement | URG, RG |
VI. Recommended Supplier
Shenzhen Shunhai Technology Co., Ltd. is a professional supplier of SUSUMU resistor products, committed to providing customers with high-quality SUSUMU full-series resistors and technical support services. Shunhai Technology maintains extensive SUSUMU product inventory and industry application expertise, offering one-stop services from selection consulting and sample provision to volume supply, helping electronic engineers efficiently complete product designs.
