Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Metal Film Resistors
E
1
R
2
O
3
S
4
2
5
C
6
H
7
F
8
1
9
0
10
0
11
2
12
Resistance
Tolerance
D
F
±0.5 %
±1%
Product
Code
Metal Film
Resistors
S2
25
Power Rating
at 70 °C Amb.
0.25 W
0.25 W
Special Feature and
Cut & Formed Style
C
P
T
Standard
Taped & Box
(52 mm)
Taped & Box (26 mm)
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.
Temperature
Coefficient
҂10–6/°C(ppm/°C)
H±50
HLH fD
fd
1st significant figure
2nd significant figure
3rd significant figure
Resistance tolerance
Multiplier
Type
Dimensions (mm)
Mass
(Weight)
[mg/pc.]
LfDfdH
EROS2C 3.20±0.20 1.70+0.20 0.45±0.05 30±3 107
ERO25C 6.30±0.50 2.30±0.50 0.60±0.05 30±3 228
–0.10
Metal fi lm Lead wire
Ceramic core, high
thermal conductivity
Spiraling
Marking
End cap
■Construction ■Dimensions in mm (not to scale)
Standard Quantity : 2000 pcs.
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 st yle for automatic inserting machine
● Marking............................... 5 color code marking
● Reference Standards ......... IEC 60115-2, JIS C 5201-2
■Explanation of Part Numbers
Insulative coating
Feb. 2006
Metal Film Resistors
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
–60 –40 –20 0 20 40 60 80 100 120 140 160 180
0
20
40
60
80
100
120
Ambient Temperature (°C)
150 °C
–55 °C 70 °C
Rated Load (%)
a
c
b
Flat box
Marking
3.2 min. 0.5 max.
0.5 max.
6±1
fd
L
P
P
1 max.
0.8 max.
L1L2
0
W
W0
fD
Type
Power
Rating
at 70 °C
(W)
Limiting Element
Voltage
(Maximum RCWV)(1)
(V)
Maximum
Overload
Voltage(2)
(V)
Dielectric
Withstanding
Voltage
(VAC)
T.C.R.
[
҂
10–6/°C
(ppm/°C)]
Resistance
Tolerance
(%)
Resistance
Range
(액)
Resis-
tance
Value
min. max.
EROS2 0.25 250 500 300 ±50 F(±1)
D(±0.5) 10 1 M E24
E96
ERO25 0.25 250 500 500 ±50 F(±1)
D(±0.5) 10 1 M E24
E96
■Ratings
(1) Rated Continuous Working Voltage (RCWV) shall be de ter mined from RCWV= =앀Power Rating҂Resistance Value, or Limiting Element Voltage
(max i mum RCWV) list ed above, whichever less.
(2) Overload (Short-time Overload) Test Voltage (SOTV) shall be determined from SOTV=2.5҂Power Rating or max. Overload Voltage list ed above
which ev er less.
Power Derating Curve
For resistors operated in ambient temperatures above
70 °C, power rating shall be derated in ac cor dance
with the fi gure on the right.
● Axial taping type
■Shape and Packaging
Packaging
Shape
Type Part Numbers Std. Qty.
(pcs./box)
Size of box
a҂b҂c (mm)
26 mm
Axial
taping
1
Metal Film R
EROS2THO첸첸첸첸
5000 52҂85҂255
52 mm
Axial
taping
2
Metal Film R
EROS2PHO첸첸첸첸
5000 78҂85҂255
26 mm
Axial
taping
3
Metal Film R
ERO25THO첸첸첸첸
4000 52҂95҂255
52 mm
Axial
taping
4
Metal Film R
ERO25PHO첸첸첸첸
2000 78҂58҂255
쪧 |L1–L2|<1.0
쪨 Cumulative 250±2 mm by 50 pitch
Shape L
max.
fD
max. fdP
±0.3 WW
0
13.4 1.9 0.45 5.0 26+1 41.5max.
23.4 1.9 0.45 5.0 52±1 64.5±0.5
36.5 2.5 0.6 5.0 26+1 41.5max.
46.5 2.5 0.6 5.0 52±1 64.5±0.5
–0
–0
Feb. 2006
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Metal Film Resistors
P2
F
fd
H0
P1
fD
W2W0
W1
W
fD0
P0
h
t
l
A
P
130
45
320
Indication
Type Part Numbers Std. Qty.
(pcs.)
Metal Film R EROS2GHO첸첸첸첸 2000
Dimensions (mm) Dimensions (mm) Dimensions (mm)
P 12.7±1.0 W05 min. 욼h0±2
P012.7±0.3 W19.0±0.5 t 0.7±0.2
P13.85±0.70 W23 max. A 3.2±0.2
P26.35±1.00 H019.0+1.0 fD1.7+0.2
F 5.0±0.5 fD04.0±0.2 fd0.45±0.05
W 18.0±0.5 k0 max.
–0.1
–0.5
Safety Precautions
1. Keep the rated power and ambient temperature within the spec i fi ed de r at ing curve.
* When positioning and mounting Metal Film Resistors (here af ter called the resistors), make allowance for the
effect of heat generated through close contact between the re sis tors and neigh bor ing com po nents and for the
temperature rise of ad ja cent heat-generating com po nents.
2. If a transient load (heavy load in a short time) like a pulse is ex pect ed to be applied, check and eval u ate the
operations of the re sis tors when installed in your products before use.
When applying pulses to the resistors, keep the pulse peak with in the rat ed voltage.
3. When the resistors' protective coatings are chipped, fl awed, or re moved, the characteristics of the re sis tors may
be im paired. Take spe cial care not to apply mechanical shock dur ing automatic mounting or cause dam age
dur ing handling of the boards with the resistors mount ed.
4. Ultrasonic cleaning may cut the lead wire due to resonance. Try and check it before use.
The following are precautions for individual products. Please also refer to the precautions com mon to Fixed Re sis tors
shown on page ER3 of this catalog.
● Radial Taping for small type
Feb. 2006
– ER3 –
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 specifi cations described in this catalog.
• This catalog explains the quality and performance of the products as individual components. Be fore 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 equip ment
where a defect in these products may cause the loss of human life or other signifi cant damage, such as damage to
vehicles (au to mo bile, train, vessel), traffi c lights, medical equipment, aerospace equipment, elec tric heating
ap pli anc es, com bus tion/gas equipment, rotating equipment, and disaster/crime prevention equip ment.
✽ Systems equipped with a protection circuit and a protection device
✽ 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 pli anc es, offi ce equipment, information and com mu ni ca tion
equipment)
• These products are not intended for use in the following special conditions. Be fore using the products, care ful ly
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 Cl2, H2S, NH3, SO2, or NO2
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. Sea ling 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 com po nents. Do not mount or place heat-generating com po nents or
infl ammables, 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 res i dues. 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 fol low ing conditions. Otherwise, their
elec tri cal performance and/or solderability may be deteriorated, and the packaging materials (e.g. tap ing ma te ri als)
may be de formed or deteriorated, resulting in mounting failures.
1. In salty air or in air with a high concentration of corrosive gas, such as Cl2, H2S, NH3, SO2, or NO2
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
