Through-hole resisTors
Carbon Film Resistors
Non-Inductive &
Flame-Proof Type
Normal & Miniature Style [ NCR Series ]
FeATures
Power Rating
Resistance Tolerance
T.C.R.
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets Overload Test
1/4W, 1/2W, 1W, 2W, 3W
±5%, ±10%
see Table 1
UL-94V-0
UL-1412
iNTroDuCTioN
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
<1μH.
The resistors are coated with layers of gray col-
or lacquer for normal size & pink color lacquer
for miniature size.
DerATiNg CurVe
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
70
100
80
60
40
20
20
40
60
80
100 120 140 160
155 °C
Ambient Temperature (°C)
TABle 1 TeMPerATure CoeFFiCieNT
VAlue rANge
Under 5KΩ
5K - 10K
Ω
TeMP. CoeFFiCieNT (ppm/°C)
-500~0
-800~0
DiMeNsioNs
sTYle
Normal
ød
H
L
5th color code: green
øD
NCR-25
NCR-50
NCR100
NCR200
Miniature
NCR50S
NCR1WS
NCR2WS
NCR3WS
DiMeNsioN
l
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
øD
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
h
28±2.0
26±2.0
35±2.0
33±2.0
ød
Unit: mm
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
35
Note:
eleCTriCAl ChArACTerisTiCs
sTYle
Power Rating at 70°C
Maximum Working Voltage
Voltage Proof on Insulation
Resistance Range
Operating Temp. Range
Temperature Coefficient
NCr-25
1/4W
PxR
500V
2.2Ω - 10KΩ for E24 series value
-55°C to +155°C
see Table 1
NCr50s
1/2W
NCr-50
NCr1Ws
1W
NCr100
NCr2Ws
2W
NCr200
NCr3Ws
3W
Note: Special value is available on request
eNViroNMeNTAl ChArACTerisTiCs
PerForMANCe TesT
Short Time Overload
Voltage Proof on Insulation
Temperature Coefficient
Insulation Resistance
Solderability
Solvent Resistance of Marking
Robustness of Terminations
Periodic-pulse Overload
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
Accidental Overload Test
TesT MeThoD
IEC 60115-1 4.13
IEC 60115-1 4.7
IEC 60115-1 4.8
IEC 60115-1 4.6
IEC 60115-1 4.17
IEC 60115-1 4.30
IEC 60115-1 4.16
IEC 60115-1 4.39
IEC 60115-1 4.24
IEC 60115-1 4.25
IEC 60115-1 4.19
IEC 60115-1 4.18
IEC 60115-1 4.26
2.5 times RCWV for 5 Sec.
in V-block for 60 Sec., test voltage by type
-55°C to +155°C
in V-block for 60 Sec.
235±5°C for 3±0.5 Sec.
IPA for 5±0.5 Min. with ultrasonic
Direct load for 10 Sec. in the direction of the terminal leads
4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off)
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
-55°C
Room Temp.
+155°C
Room Temp. (5 cycles)
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the
body
4 times RCWV for 1 Min.
APPrAise
±0.75%+0.05Ω for normal style
±2.0%+0.05Ω for miniature style
By type
By type
>1,000MΩ
95% Min. coverage
No deterioration of coatings and
markings
≥2.5kg (24.5N)
±1.0%+0.05Ω
±3.0%+0.05Ω
±3.0%+0.05Ω
±1.0%+0.05Ω
±1.0%+0.05Ω
No evidence of flaming or arcing
Revision: 201304
Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
