Precision Metal Film Resistors
Precision Metal Film Resistors
Type:
ERN55
(0.25 W)
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Features
Precision ááááááááááááááááááááááááááá Resistance tolerance: ±0.1 %, T.C.R.: ±25
´10
-6
/ûC (ppm/ûC)
Wide temperature range (operating temperature range) ááá Ð55 ûC to 150 ûC
Performance, Reliability ááá Low TCR and noise, high reliability
Approved under the ISO 9001 system
Reference Standards ááááááááá IEC 60115-2, JIS C 5201-2
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Explanation of Part Numbers
1
E
2
R
3
N
4
5
5
5
6
C
7
F
8
1
9
0
10
0
11
2
Product Code
Precision
Fixed Metal
Film Resistors
Power Rating
at 70 ¡C Ambient
55 0.25 W(70 ¡C)
Temperature
Coefficient
´
10
-6
/ûC (ppm/ûC)
± 25
E
± 50
C
Resistance
Tolerance
B ±0.1 %
C ±0.25 %
D ±0.5 %
F ±1 %
Resistance Value
The first three digits are significant
figures of resistance and the 4th
digit denotes number of zeros
following.
Decimal point is expressed by R as
49.9
W
= 49R9.
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Construction
Vapor evaporated NiCr
alloy film
Lead wire
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Dimensions in mm (not to scale)
30±3
L
30±3
B
D
Ceramic core, high
thermal conductivity
Insulative
coating
B
d
Stamp Marking=10 k
9
, Class F, Type 55C
1002
F
Spiraling
Marking
1002
55C
1002
Primary protective
coating
Welding
End cap
Standard Quantity : 100 pcs.
Type
ERN55
Dimensions (mm)
L
6.30±0.50
fD
2.30±0.50
fd
0.60±0.05
Please contact us for taping shape.
Rev.02/04
Design, Specifications are subject to change without notice.
Ask factory for technical specifications before purchase and/or use.
Whenever a doubt about safety arises from this product, please inform us immediately for technical consultation without fail.
Precision Metal Film Resistors
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Ratings
Type
Power
Rating
(W)
Limiting element
Voltage
(Maximum
RCWV)
(1)
(V)
Overload
Voltage
(2)
(V)
Dielectric
With-
standing
Voltage
(V)
T.C.R.
´10
-6
/ûC
(ppm/ûC)
± 25
70 ûC:0.25
ERN55C
(1)
(2)
Resistance
Tolerance
(%)
B:±0.1
C:±0.25
D:±0.5
F:±1
Resistance
Range (W)
min. max.
100
49.9 301 k
49.9 301 k
49.9 301 k
Standard
Resistance
Values
Mass
(mg)
ERN55E
250
500
450
301 k E192, E24
E96, E24
E96, E24
E96, E24
219
± 50
Rated Continuous Working Voltage (RCWV) should be determined from RCWV=
Ã
Power Rating
´
Resistance Value, or Limiting Element Voltage
(maximum RCWV) listed above, whichever is less.
Overload (Short-time Overload) Test Voltage (SOTV) should be determined from SOTV=2.5
´
Power Rating or max. Overload Voltage listed above whichever
is less.
Power Derating Curve
For resistors operating in ambient temperature above
70 ¡C, power rating should be derated in accordance
with the right figure.
120
Ð55 ¡C
70 ¡C
100
80
60
40
20
150 ¡C
0Ð60 Ð40 Ð20 0 20 40 60 80 100 120 140 160 180
Ambient Temperature (¡C)
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Performance Specifications
Characteristics
Specifications
Test Methods
Load Life in Humidity
±(0.5 %+0.05
W)
1000 hours (1.5 h ON, 0.5 h OFF)
Rated load, at 40 ¡C in 90 to 95 % RH
Load Life
±(0.5 %+0.05
W)
1000 hours (1.5 h ON, 0.5 h OFF)
Rated load, at 125 ¡C
Safety Precautions
1. Rated Power and Ambient Temperature
Keep the rated power and ambient temperature within the specified derating curve.
]
Mount resistors and other heating components on the board, taking into consideration
the cumulative temperature rise of all components.
2. External Shock
Mechanical shock during automatic mounting or handling of board after chip is mounted may result
in breakage, or separation of the protective coating of the resistor which may impair initial characteristics.
3. Ultrasonic Cleaning
Ultrasonic cleaning may sever lead wire due to resonance. Verify before actual use.
4. Application of Pulse
When pulse is applied to resistor, the peak value of pulse should be within the rated voltage.
Before ordering, test sample components in your application to ensure proper function and compatiblity.
Design, Specifications are subject to change without notice.
Ask factory for technical specifications before purchase and/or use.
Whenever a doubt about safety arises from this product, please inform us immediately for technical consultation without fail.
Rated Load (%)
