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Kamaya (釜屋電機) Resistor Portfolio: Series, Part Numbers, Applications and Market Positioning

2026-07-17 Source：SHEN ZHEN SHUNHAI TECHNOLOGY .,LTD

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Kamaya Electric Co., Ltd. is a Japanese passive component manufacturer founded in 1957. Acquired by Walsin Technology in 2011, it continues to operate as an independent brand with its own R&D and quality system. Its product range spans thick/thin film chip resistors, carbon composition resistors, chip fuses, MLCCs, disc capacitors and RF devices—components that can be found in virtually every electronic device, from automobiles to mobile phones and industrial machinery.

Kamaya (釜屋電機) Resistor Portfolio: Series, Part Numbers, Applications and Market Positioning

Product Architecture Overview

Kamaya's resistor portfolio splits into two main form factors:

Chip (SMD) resistors – the core business, covering general-purpose thick film, precision thin film, anti-sulfuration, high voltage, surge-resistant, and low-ohm current sensing variants
Lead (axial) resistors – represented by the RC series for through-hole applications

Functionally, the SMD line organizes into seven tracks:

General & precision: RMC, RACA, RGC, RNC, RMPC
High power & compact: RMCH, TWMC, RMGW
Anti-sulfuration: RMAW, RMSW, RMGW, RVAC, RBX, RPGW
High & ultra-high voltage: RVC, RZC, RVAC
Surge-resistant: RPC, RPCH, RBX, RPGW
Low-ohm & current sensing: RLC, RCC, TWLC, RLP, MLP, MLP63C, WLP63, TWP, DLP, SMP
Functional & protection: FCR (chip fuse), RAC/RAAW (resistor networks), LTC (linear thermistor), FCR (trimming resistor)

The RMC series is Kamaya's highest-volume general-purpose thick film line, available in nine case sizes from 01005 to 2512, including 0Ω jumper options.

Key Series Breakdown

General-Purpose Thick Film & Precision

RMC covers case sizes from 01005 (0402 metric) up to 2512 (6332 metric). The RMC1/16S variant delivers 0.1W in a 0402 footprint, using laser-scribing for precise dimensions, with halogen- and antimony-free versions available on request.

RGC is the precision thick-film version, offering tolerances down to ±0.1% in sizes 0603–3216 and AEC-Q200 qualified. RNC is the thin-film precision series for applications demanding tighter TCR and long-term stability.

RMPC is a lead-free general-purpose line with Pb content under 100ppm, RoHS compliant. RMCH is the high-power derivative—for example, RMCH16 delivers 0.25W, 2.5× the 0.1W of RMC1/16.

Anti-Sulfuration Series

Silver-bearing internal electrodes are vulnerable to sulfur-induced open failures, especially in automotive and industrial atmospheres. Kamaya addresses this with a tiered lineup:

RMAW – special internal electrode design, standard anti-sulfuration grade
RMSW – high-performance grade meeting Kamaya's Level 2 anti-sulfuration standard
RMGW – flagship line combining special electrodes with a protective barrier layer
RVAC – high-voltage resistor with anti-sulfuration features
RBX / RPGW – combined anti-sulfuration + surge-resistant; RPGW adds high power

Per Kamaya's official datasheet, RMGW16 (0603) operates at 0.1W with resistance spanning 1Ω–10MΩ, TCR from ±100 to ±600×10⁻⁶/℃ depending on resistance band.

High & Ultra-High Voltage

RVC offers elevated maximum working voltage versus RMC; RZC is the ultra-high-voltage variant designed primarily for inverter circuits in large LCD panel backlight modules.

Surge-Resistant

RPC provides superior surge withstand compared to RMC, suitable for lightning, ESD and switching transient environments. RPCH builds on RPC with higher rated power.

Low-Ohm & Current Sensing

This segment has grown rapidly with EV and energy storage adoption. Kamaya's gradient is notably detailed:

Series	Construction	Typical Use
RLC / RCC	Thick-film low-ohm; RCC is reverse-terminal	Portable electronics current detection
TWLC / TWP	Long-side / wide-terminal	Improved solder reliability & heat dissipation
RLP / MLP	Metal plate low-ohm	Battery pack high-current sensing
MLP63C	2512 size, 3W	High-power current shunt
WLP63	2512 size, 2W, 15–25mΩ	Low-resistance shunt
DLP	Metal foil, TCR ±100×10⁻⁶/℃	High-precision current sensing
SMP	Metal-element shunt	Automotive & industrial

Sources:

Functional & Protection

FCR – resistive chip fuse for overcurrent protection in battery and power circuits
RAC / RAAW – chip resistor networks; RAAW adds anti-sulfuration to the network
LTC – positive linear thermistor for temperature compensation, sensing and circuit protection

Axial Lead Resistors

RC1/2U is a discharge-rated fixed resistor recognized under UL 1676 (File E151897), used in industrial and power applications requiring through-hole mounting.

Part Number Decoding

Understanding Kamaya's naming convention is essential for procurement and BOM management. Taking the RMAW anti-sulfuration resistor as an example:

RMAW  16    K    103    F    TP
 │    │     │     │     │    │
 │    │     │     │     │    └─ Packaging (TP = paper tape)
 │    │     │     │     └────── Tolerance (F = ±1%, J = ±5%, D = ±0.5%)
 │    │     │     └──────────── Resistance (E24 three-digit / E96 four-digit, 103 = 10kΩ)
 │    │     └────────────────── TCR (K = ±100×10⁻⁶/℃)
 │    └──────────────────────── Size code (16 = 1608 = 0603)
 └────────────────────────────── Series name

Key points:

Resistance coding: E24 uses 3 digits (103 = 10kΩ); E96 uses 4 digits (1002 = 10kΩ); jumper chips marked "JP"
Tolerance codes: D = ±0.5%, F = ±1%, J = ±5%
Size codes: 06 = 0603, 10 = 1005, 16 = 1608, 20 = 2012, 32 = 3216, 35 = 3225, 50 = 5025, 63 = 6332
Low-ohm marking differs: RLC series marks values like R050 = 0.05Ω, R205 = 0.205Ω

RMC uses fractional power notation (RMC1/16, RMC1/10, RMC1/4); suffix "S" denotes enhanced versions—e.g., RMC1/16S actually delivers 0.1W.

Applications

Kamaya positions its resistors across a broad application spectrum:

Automotive: engine control units, vehicle sensors, ADAS modules, lamp drivers, BMS
Consumer electronics: smartphones, tablets, wearables, notebook mainboards, LCD panels
Communications: 5G base stations, routers, optical modules, switches
Industrial control: PLCs, sensor modules, motor drives, automation lines
Medical devices: portable instruments, monitors, measurement equipment
Power systems: adapters, DC-DC converters, inverters, UPS

For automotive designs, RGC, RNC, RACA (AEC-Q200 qualified) are preferred. In sulfur-rich industrial settings, RMGW, RMSW extend service life. For EV high-current sensing, MLP63C, SMP metal-plate resistors fit best.

Advantages and Market Positioning

Technical strengths:

Automotive-grade reliability: RMC, RGC and others meet AEC-Q200, operating from −55℃ to +155℃, stable after 85℃/85%RH 1000-hour testing
Compliance: Full RoHS, Halogen-Free and REACH compliance, certified under ISO9001, ISO14001, IATF16949 (automotive) and ISO45001
Process depth: From thick film to thin film, from general-purpose to anti-sulfuration, high-voltage, surge-resistant and low-ohm sensing—a complete process coverage serving nearly every niche

Market positioning: Kamaya sits in the second tier of Japanese passive component brands, behind Murata, Panasonic and Rohm, but it is highly regarded in niches like anti-sulfuration resistors and metal-plate current-sensing resistors. After the Walsin acquisition, it retained its Japanese R&D and quality framework while leveraging Walsin's production scale and channel reach across Asia.

In terms of value proposition, Kamaya prices slightly above Taiwanese and domestic Chinese equivalents but below the top-tier Japanese quotes—a balanced choice for mid-to-high-end projects seeking "Japanese quality at reasonable cost."

Procurement Notes

💡 When sourcing Kamaya resistors domestically, verify the exact part number string against the official datasheet—suffix variations (tolerance, TCR, packaging, special specs) can significantly affect pricing and lead time. Cross-series selection support (e.g., RMC vs RGC, RMGW vs RMAW) is often best arranged through an experienced distributor.

For project-specific selection, Shenzhen Shunhai Technology Co., Ltd. is an active supplier of Kamaya product lines in China, offering datasheet verification, alternative-recommendation, prototype sampling and volume ordering services—particularly useful for procurement and engineering teams navigating cross-series trade-offs.

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