Through-hole resistors
Non-Inductive &
Flame-Proof Type
Carbon Film Resistors
Normal & Miniature Style [ NCR Series ]
FEATURES
Power Rating
1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance
±5%, ±10%
T.C.R.
see Table 1
Flameproof Multi-layer Coating Meets
UL-94V-0
Flameproof Feature Meets Overload Test
UL-1412
INTRODUCTION
DERATING CURVE
The NCR Series Carbon Film Non-Inductive &
Flame-Proof Resistors are manufactured by
coating a homogeneous film of pure carbon
on high grade ceramic rods. Tinned connecting
leads of electrolytic copper are welded to the
end-caps. The inductance is 1,000MΩ
Solderability
IEC 60115-1 4.17
235±5°C for 3±0.5 Sec.
95% Min. coverage
Solvent Resistance of Marking
IEC 60115-1 4.30
IPA for 5±0.5 Min. with ultrasonic
No deterioration of coatings and
markings
Robustness of Terminations
IEC 60115-1 4.16
Direct load for 10 Sec. in the direction of the terminal leads
≥2.5kg (24.5N)
Periodic-pulse Overload
IEC 60115-1 4.39
4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off)
±1.0%+0.05Ω
Damp Heat Steady State
IEC 60115-1 4.24
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
±3.0%+0.05Ω
Endurance at 70°C
IEC 60115-1 4.25
70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
±3.0%+0.05Ω
Temperature Cycling
IEC 60115-1 4.19
-55°C Room Temp. +155°C Room Temp. (5 cycles)
±1.0%+0.05Ω
Resistance to Soldering Heat
IEC 60115-1 4.18
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the
body
±1.0%+0.05Ω
Accidental Overload Test
IEC 60115-1 4.26
4 times RCWV for 1 Min.
No evidence of flaming or arcing
Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
Revision: 201304
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