Discontinued
Metal Film Resistors
Metal Film Resistors
Type:
EROS2
(0.25 W)
ERO25
(0.25 W)
■
Features
●
Performance, Reliability...... Low T.C.R. and noise, high reliability
●
Automatic insertion ............. Taping style for automatic inserting machine
●
Marking............................... 5 color code marking
●
Reference Standards ......... IEC 60115-2, JIS C 5201-2
■
Explanation of Part Numbers
1
2
3
4
5
6
7
8
9
10
11
12
E
R
O
S
2
C
H
F
1
0
0
2
Product
Code
Metal Film
Resistors
Power Rating
at 70
°C
Amb.
S2
25
0.25 W
0.25 W
C
P
T
Special Feature and
Cut & Formed Style
Standard
Taped & Box
(52 mm)
Taped & Box (26 mm)
Temperature
Coefficient
10
–6
/°C(ppm/°C)
±
50
H
Resistance
Tolerance
D
F
±
0.5 %
±
1%
Resistance Value
The first three digits are
significant figures of resistance
and the 4th digit denote number
of zeros following.
Decimal point is expressed
by R as 97.6 = 97R6.
■
Construction
■
Dimensions in mm (not to scale)
H
L
H
fD
Metal film
Lead wire
fd
1st significant figure
Ceramic core, high
thermal conductivity
Insulative coating
2nd significant figure
3rd significant figure
Resistance tolerance
Multiplier
Spiraling
Marking
Standard Quantity : 2000 pcs.
Dimensions (mm)
Type
Mass
(Weight)
[mg/pc.]
L
EROS2C
End cap
fD
1.70
–0.10
2.30
+0.20
fd
0.45
0.60
±0.05
H
30
30
±3
3.20
6.30
±0.20
107
228
ERO25C
±0.50
±0.50
±0.05
±3
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Feb. 2006
Discontinued
Metal Film Resistors
■
Ratings
Power
Rating
at 70 °C
(W)
Limiting Element
Voltage
(1)
(Maximum RCWV)
(V)
Maximum
Overload
(2)
Voltage
(V)
Dielectric
Withstanding
Voltage
(VAC)
T.C.R.
–6
[ 10 /°C
(ppm/°C)]
Resistance
Tolerance
(%)
F(±1)
D(±0.5)
F(±1)
D(±0.5)
Resistance
Resis-
Range
tance
( )
Value
min.
EROS2
ERO25
0.25
0.25
250
250
500
500
300
500
±50
±50
10
10
max.
1 M
1 M
E24
E96
E24
E96
Type
(1) Rated Continuous Working Voltage (RCWV) shall be determined from RCWV=
=
Power Rating Resistance Value, or Limiting Element Voltage
(maximum RCWV) listed above, whichever less.
(2) Overload (Short-time Overload) Test Voltage (SOTV) shall be determined from SOTV=2.5 Power Rating or max. Overload Voltage listed above
whichever less.
Rated Load (%)
Power Derating Curve
For resistors operated in ambient temperatures above
70 °C, power rating shall be derated in accordance
with the figure on the right.
120
100
80
60
40
20
–55
°C
70
°C
0
–60 –40 –20 0
150
°C
20 40 60 80 100 120 140 160 180
Ambient Temperature (°C)
●
Axial taping type
3.2 min.
fd
■
Shape and Packaging
6±1
L
0.5 max.
Shape
P
0.5 max.
fD
1
2
3
4
L
max.
3.4
3.4
6.5
6.5
fD
max.
1.9
1.9
2.5
2.5
fd
0.45
0.45
0.6
0.6
P
±0.3
5.0
5.0
5.0
5.0
W
26
+1
–0
52±1
+1
26
– 0
52±1
W
0
41.5max.
64.5±0.5
41.5max.
64.5±0.5
0
L
1
0.8 max.
W
W
0
L
2
1 max.
P
|L
1–
L
2
|
<1.0
Cumulative 250±2 mm by 50 pitch
Flat box
Packaging Shape
26 mm
Axial
taping
52 mm
Axial
taping
26 mm
Axial
taping
52 mm
Axial
taping
1
2
3
4
Type
Part Numbers
Std. Qty.
(pcs./box)
5000
5000
4000
2000
Size of box
a b c (mm)
52 85 255
78 85 255
52 95 255
78 58 255
Metal Film R EROS2THO
Metal Film R EROS2PHO
Metal Film R ERO25THO
Metal Film R ERO25PHO
b
Ma
rkin
g
c
a
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Feb. 2006
Discontinued
Metal Film Resistors
●
Radial Taping for small type
P
2
A
fd
H
0
P
1
F
W
2
P
h
fD
Type
Metal Film R
Part Numbers
EROS2GHO
Std. Qty.
(pcs.)
2000
W
0
W
1
W
l
P
0
fD
0
Dimensions (mm)
P
P
0
P
1
P
2
F
W
12.7±1.0
12.7±0.3
3.85±0.70
6.35±1.00
5.0±0.5
18.0±0.5
W
0
W
1
W
2
H
0
fD
0
k
Dimensions (mm)
5 min.
9.0±0.5
3 max.
19.0
+1.0
–0.5
4.0±0.2
0 max.
h
t
A
fD
fd
t
Dimensions (mm)
0±2
0.7±0.2
3.2±0.2
1.7
+0.2
–0.1
0.45±0.05
130
Indication
45
320
Safety Precautions
The following are precautions for individual products. Please also refer to the precautions common to Fixed Resistors
shown on page ER3 of this catalog.
1. Keep the rated power and ambient temperature within the specified derating curve.
* When positioning and mounting Metal Film Resistors (hereaf ter called the resistors), make allowance for the
effect of heat generated through close contact between the resistors and neighboring components and for the
temperature rise of adjacent heat-generating components.
2. If a transient load (heavy load in a short time) like a pulse is expected to be applied, check and evaluate the
operations of the resistors when installed in your products before use.
When applying pulses to the resistors, keep the pulse peak within the rated voltage.
3. When the resistors' protective coatings are chipped, flawed, or removed, the characteristics of the resistors may
be impaired. Take special care not to apply mechanical shock during automatic mounting or cause damage
during handling of the boards with the resistors mounted.
4. Ultrasonic cleaning may cut the lead wire due to resonance. Try and check it before use.
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Feb. 2006
Safety Precautions
(Common precautions for Fixed Resistors)
• When using our products, no matter what sort of equipment they might be used for, be sure to make a written
agreement on the specifi cations with us in advance. The design and specifi cations in this catalog are subject
to change without prior notice.
• Do not use the products beyond the specifications described in this catalog.
• This catalog explains the quality and performance of the products as individual components. Before use, check
and evaluate their operations when installed in your products.
• Install the following systems for a failsafe design to ensure safety if these products are to be used in equipment
where a defect in these products may cause the loss of human life or other significant damage, such as damage to
vehicles (au to mo bile, train, vessel), traffi c lights, medical equipment, aerospace equipment, elec tric heating
appliances, combustion/gas equipment, rotating equipment, and disaster/crime prevention equipment.
½
Systems equipped with a protection circuit and a protection device
½
Systems equipped with a redundant circuit or other system to prevent an unsafe status in the event of a single fault
(1) Precautions for use
• These products are designed and manufactured for general and stan dard use in general elec tron ic
equipment (e.g. AV equipment, home electric ap plianc es, offi ce equipment, information and com mu ni cation
equipment)
• These products are not intended for use in the following special conditions. Before using the products, carefully
check the effects on their quality and performance, and determine whether or not they can be used.
1. In liquid, such as water, oil, chemicals, or organic solvent
2. In direct sunlight, outdoors, or in dust
3. In salty air or air with a high concentration of corrosive gas, such as Cl
2
, H
2
S, NH
3
, SO
2
, or NO
2
4. Electric Static Discharge (ESD) Environment
These components are sensitive to static electricity and can be damaged under static shock (ESD).
Please take measures to avoid any of these environments.
Smaller components are more sensitive to ESD environment.
5. Electromagnetic Environment
Avoid any environment where strong electromagnetic waves exist.
6. In an environment where these products cause dew condensation
7. Sealing or coating of these products or a printed circuit board on which these products are mounted, with resin
or other materials
• These products generate Joule heat when energized. Carefully position these products so that their heat will not
affect the other components.
• Carefully position these products so that their temperatures will not exceed the category temperature range due
to the effects of neighboring heat-generating components. Do not mount or place heat-generating components or
inflammables, such as vinyl-coated wires, near these products .
• Note that non- cleaning solder, halogen-based highly active fl ux, or water-soluble fl ux may deteriorate the
performance or reliability of the products.
• Carefully select a fl ux cleaning agent for use after soldering. An unsuitable agent may deteriorate the
performance or reliability. In particular, when using water or a water-soluble cleaning agent, be careful not to leave
water residues. Otherwise, the insulation performance may be deteriorated.
(2) Precautions for storage
The performance of these products, including the solderability, is guaranteed for a year from the date of arrival at your
company, provided that they remain packed as they were when delivered and stored at a temperature of 5 °C to 35 °
C and a relative humidity of 45 % to 85 %.
Even within the above guarantee periods, do not store these products in the following conditions. Otherwise, their
electrical performance and/or solderability may be deteriorated, and the packaging materials (e.g. taping materials)
may be deformed or deteriorated, resulting in mounting failures.
1. In salty air or in air with a high concentration of corrosive gas, such as Cl
2
, H
2
S, NH
3
, SO
2
, or NO
2
2. In direct sunlight
<Package markings>
Package markings include the product number, quantity, and country of origin.
In principle, the country of origin should be indicated in English.
Feb. 2006
– ER3 –
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