MELF RESISTORS

Metal Film Precision MELF Resistors

RJM

Precision MELF RJM Series is made by metal film alloy deposited on a ceramic rod by a vacuum process of evaporation or sputtering with excellent characteristics, moisture proof, low TCR, compacted size, and stable.

Tokenchina's Precision RJM series allows designers to guarantee a high degree of accuracy in fixed-resistor applications. Applications include precision amplifiers, high-precision instrumentation, medical and automatic test equipment, high-end stereo equipment, electron beam scanning and recording equipment, as well as military, aerospace, down-hole equipment, and instrumentation.

The MELF RJM series is lead-free and RoHS compliant, MIL-R-10509, MIL-R-55182, and other military grade. Detailed specifications, both mechanical and electrical, please contact our sales representative for more information.


Features MELF Precision Resistors

  • Tolerance up to ±0.05%.
  • Advanced thin film technology.
  • Low TCR: lower than ±5ppm/°C.
  • Power dissipation rating up to 5W.
  • Excellent overall stability: Class 0.10.
  • Wide resistance range: 0.1Ω to 22MΩ.
  • Very high ratio of performance to price.

Characteristics & Dimensions (mm) - Precision MELF

Type RJM72P RJM73S RJM73P RJM74S RJM74P RJM16M RJM17M RJM18M
Metric type DIN: 0102 DIN: 0204 DIN: 0207 DIN: 0411
Rated dissipation   P70 0.125W 0.125W 0.25W 0.25W 0.50W 1.0W 2.0W 3.0W
Resistance range (Ω) 10 ~ 1M 0.1 ~ 10M 0.1 ~ 22M 0.1 ~ 22M
Resistance tolerance (%) J ( ±5 ); F ( ±1 ); D ( ±0.5 ); C ( ±0.25 ); B ( ±0.10 ); A5 ( ±0.05 )
Temperature coefficient
(ppm/°C)		 C2 ( ±50 ); C3 ( ±25 ); C5( ±15 ); C6 ( ±10 ); C7 ( ±5 )
Climatic category
(LCT/UCT/days)		 55 / 125 / 56
Operating voltage   Umax 200V 200V 250V 250V 300V 350V 400V 450V
Temperature range -55°C to 125°C
Insulation voltage (V) 300 300 300 300 600 700 800 900
Insulation resistance >1GΩ
Dimension (mm) L(±0.3) 2.2 3.5 5.7 6.0 8.7 11.8
L1(±0.3) 1.0 1.6 2.9 3.3 4.9 8.1
D(±0.3) 1.3 1.3 2.1 2.1 3.1 3.6
K(±0.2) 0.4 0.8 1.3 1.3 1.8 1.8
D1(±0.1) D+0/D-0.15 D+0/D-0.25 D+0/D-0.5 D+0/D-0.5 D+0/D-0.5 D+0/D-0.5
Soldering bath
(recommended)
(mm)		 S 1.0 1.6 2.6 2.8 5.6 8.2
W 2.0 2.5 2.5 2.8 3.2 4.0
H 2.0 2.5 2.5 2.8 3.8 4.5
  • Resistance out of range, tolerance and temperature coefficient match are under request.
  • RJM72 is still in trial production.

How to Order - Precision Melf RJM

RJM74P 10R D C6 T
Product Type
RJM72P
RJM73S
RJM73P
RJM74S
RJM74P
RJM16M
RJM17M
RJM18M
Resistance Value (Ω)
10 ~ 1M
0.1 ~ 10M
0.1 ~ 10M
0.1 ~ 22M
0.1 ~ 22M
0.1 ~ 22M
0.1 ~ 22M
0.1 ~ 22M
Resistance Tolerance (%)
J ±5
F ±1
D ±0.5
C ±0.25
B ±0.10
A5 ±0.05
Temperature
coefficient (ppm/°C)
J ±5
C2 ±50
C3 ±25
C5 ±15
C6 ±10
C7 ±5
Packaging
T Taping Reel
P Bulk

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RJM series - Metal Film Precision MELF Resistors