High Voltage Ceramic Composition Resistors (RMCA, RMCB)

Bulk Composition Ceramic Resistor (RMCA, RMCB) Introduction

Non-Inductive (RMCA, RMCB) Enhanced Performance for High Voltage Ignition Applications

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  • Ceramic Composition Resistors (RMCA, RMCB)

The RMCA, RMCB Series MELF type of fixed ceramic resistors from Token Electronics offers automotive designers a compact solution for applications involving high voltages, surges, high peak power, or high-energy pulses. They offer enhanced performance in R-C snubber circuits, high voltage power supplies, and inrush limiters.

Token's RMCA, RMCB series now offers the industry a direct replacement carbon composition resistor based on a bulk resistive element comprising carbon in a ceramic filler. Due to the need for higher peak voltages, the RMCA, RMCB range is perfect for vehicle ignition system applications.

The RMCA, RMCB Voltage Resistors conform to RoHS compliant and lead free. For customed designs, tighter tolerances, non-standard technical requirements, or custom special applications, please contact our sales for more information.

Download complete specification High Voltage Ceramic Composition Resistors (RMCA, RMCB) PDF.

Applications :
  1. Inrush limiters, R-C snubber circuits
  2. Vehicle ignition system, High voltage power supplies
Features :
  1. Suitable for noise suppressor of engine ignition system.
  2. High peak power, Reliable with non-disconnection failure.
  3. Rated Wattage up 5W, meets high energy density demands.
  4. Operating Temperature -40°C ~ 155°C. Resistance Tolerance K(±10%), M(±20%).
  5. Typical resistance range 470 ohm ~ 100 Kohm. Replaces 1 and 2 watt carbon composition resistors.
Ceramic Composition Resistor Construction :
  1. Bulk ceramic resistor that consists of a clay, alumina, and ceramic filler that has been blended and pressurized into a resistive core and then covered with a molded outer insulating core.
Replacement Carbon-Composition Resistors :
  1. Design requirements for custom sizes, surface mount, or special footprints can be met easily.
  2. In cases where several carbon-composition resistors have been used together in an array to achieve a particular rating, they have been replaced with a single bulk ceramic resistor, frequently at a lower installed cost.

General Specifications (RMCA, RMCB)

Ceramic Composition Resistors (RMC-A) Dimensions
Ceramic Composition Resistor
(RMC-A) Dimensions
Ceramic Melf Resistors (RMC-B) Dimensions
Ceramic Composition Melf
(RMC-B) Dimensions
Model Style Rated Wattage Dimensions (Unit: mm)
L D
RMC A 1 7 ± 1.5 4.0 ± 0.4
9 ± 1.5 4.0 ± 0.4
10 ± 1.5 4.0 ± 0.4
B 11 ± 1.5 4.6 ± 0.5
RMC A 2 18 ± 1.5 4.0 ± 0.4
B 19 ± 1.5 4.6 ± 0.5
RMC A 3 24 ± 2.0 4.0 ± 0.4
B 25 ± 2.0 4.6 ± 0.5
RMC A 5 24 ± 2.0 7.0 ± 0.5
B 25 ± 2.0 7.6 ± 0.5

Electrical Characterisics (RMCA, RMCB)

Item RMCA, RMCB
Power Rating at 25°C (W) 1 2 3 5
Operating Temp. Range (°C) -40 ~ 155
Resistance Tolerance K(±10%), M(±20%)
Resistance Range (Ω) 470 ~ 33K 1K ~ 56K 1K ~ 100K 470 ~ 33K
Max. Working Voltage (V) 300 350 400 500
T.C.R (PPM/°C) -40°C ~ 25°C -750 ~ 3300 -750 ~ 3300 -750 ~ 3300 -750 ~ 3300
25°C ~ 155°C -750 ~ 2600 -750 ~ 2600 -750 ~ 2600 -750 ~ 2600
Max. Pulse Voltage (KV) 8 15 20 25
Moisture Resistance (%) 10 10 10 10

Non-Inductive Performance:

  1. Chemically inert and thermally stable, the resistors are inherently non-inductive because of their bulk ceramic construction, which allows energy and power to be uniformly distributed through the entire ceramic resistor body with no film or wire to fail.
  2. The bulk ceramic material also allows simple efficient resistor designs that enable the designer to minimize the resistor package size while providing the required performance and reliability.

Order Codes (RMCA, RMCB)

RMC 2W a 510R M
Part Number
RMC
Rated Power (W)
1W
2W
3W
5W
Style
a Style
b Style
Resistance Value (Ω)
510R 510Ω
5K1 5.1KΩ
51K 51KΩ
68K 68KΩ
Resistance Tolerance (%)
K ±10%
M ±20%