METAL FILM (ULTRA PRECISION)
MRS
EU
RoHS
Plate - Shaped High Precision Metal Film Resistors
■Construction
L
①
②
③
④
d
⑤
⑥
P
F
① Resistive film
② Outer coating resin
③ Solder
④ Ceramic substrate
⑤ Inner electrode
⑥ Terminal
D
H
Coating color：Black
Marking：Alphanumeric
■Features
・
Easily usable lead frame shape with wide resistance range.
・
Super-high precision resistors with resistance tolerance
−6
±0.01% and T.C.R. ±2.5×10 /K.
・
High density mounting available due to its plate shape and
thinness (t=2.5mm Max.).
・
Excellent in long-term stability.
・
Products meet EU-RoHS requirements.
■Dimensions
Type
MRS1/8
MRS1/4
MRS1/3
Dimensions（mm）
L max.
5.6
7.5
H max.
6.2
9.0
D max.
2.5
P±0.2
2.54
5.08
3.81
0.5
0.25
F
（Nom.） d Nom.）
（
ℓ
3±0.5
8±2
Weight g）
（
（1000pcs）
103
137
212
■Applications
・
Theråmo Controllers
・
Medical Equipment
・
Oscilloscopes
・
Measuring Equipment
・
Recorders
■Type Designation
Example
MRS
Product
Code
1/3
Power
Rating
1/8：0.125W
1/4：0.25W
1/3：0.3W
S
T.C.R.
（×10
−6
/K）
S：±2.5
Y：±5
T：±10
E：±25
D
Terminal
Suface Material
D：SnAgCu
1002
Nominal
Resistance
4 digits
T
Resistance
Tolerance
T ：±0.01%
Q：±0.02%
A：±0.05%
B：±0.1%
C：±0.25%
D：±0.5%
Super Precision Type Resistors
Contact us when you have control request for environmental hazardous material other than the substance
specified by EU-RoHS.
■Ratings
Type
MRS1/8YD
MRS1/8TD
MRS1/8ED
MRS1/4YD
MRS1/4TD
MRS1/4ED
MRS1/3SD
MRS1/3YD
MRS1/3TD
Power
Rating
0.125W
T.C.R.
−6
（×10 /K）
Y：±5
T：±10
E：±25
Y：±5
T：±10
E：±25
S：±2.5
Y：±5
T：±10
0.25W
0.3W
T：±0.01%
E96
－
－
－
－
－
－
100½100k
100½100k
100½100k
Q：±0.02%
E96
－
－
－
－
－
－
30.1½100k
30.1½100k
30.1½100k
Resistance Range （Ω）
Max. Working
A：±0.05%
B：±0.1%
C：±0.25%
D：±0.5%
Voltage
※2
n
※2
n
n
n
E24 E96 & 25, 50×10 E24 E96 & 25, 50×10 E24 E96 & 25, 50×10 E24 E96 & 25, 50×10
・
・
・
・
100½250k
100½250k
100½250k
100½250k
100½250k
100½510k
30½510k
30½510k
200V
100½250k
100½510k
10½510k
10½510k
100½510k
100½510k
100½510k
100½510k
100½510k
100½1M
30½1M
30½1M
250V
100½510k
100½1M
10½1M
10½1M
30.1½100k
30.1½100k
－
－
10½100k
10½100k
－
－
200V
10½100k
10½100k
－
－
※1
Max. Overload
Voltage
400V
500V
※1 Please consult with us for resistance other than E24 and E96.
※2 MRS1/3 is available only in E96 series.
Rated Ambient Temperature :＋70℃
Operating Temperature Range :−55℃∼＋125℃
Rated voltage＝
√￣￣￣￣￣￣￣￣￣￣￣
or Max. working voltage, whichever is lower.
Power Rating×Resistance value
146
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Oct. 2020
Oct. 2021
www.koaglobal.com
■Derating Curve
Percent rated power ％）
（
100
80
60
40
20
0
-60
-55
-40
-20
0
20
40
60
80 100 120
70
125
140
Ambient temperature (℃)
For resistors operated at an ambient temperature of 70℃ or higher, the power shall be
derated in accordance with the above derating curve.
■Surface Temperature Rise
Surface temperature rise（℃）
100
75
50
25
0
MRS1/4
0
25
50
75
100
MRS1/8
Power rating ratio (%)
■Performance
Super Precision Type Resistors
Super Precision Type Resistors
Test Items
Resistance
T.C.R.
Overload（Short time）
Resistance to soldering heat
Rapid Change of temperature
Dielectric withstanding voltage
Endurance at 70℃
Moisture resistance
Insulation resistance
Resistance to solvent
Performance Requirements
ΔR±
（%＋0.05Ω）
Within specified tolerance
Within specified T.C.R.
0.05
0.1 ：MRS1/8, 1/4
0.05：MRS1/3
0.1 ：MRS1/8, 1/4
0.05：MRS1/3
0.5 ：MRS1/8, 1/4
0.05：MRS1/3
0.1 ：MRS1/8, 1/4
0.05：MRS1/3
0.1 ：MRS1/8, 1/4
0.05：MRS1/3
10,000MΩ and more
No abnormality in appearance. Marking shall be easily legible.
Test Methods
25℃
＋25℃/＋65℃
Rated Voltage×2.5 or Max. overload Vol. whichever is lower, for 5s
350℃±10℃ 3.5s±0.5s
/＋125
＋3
℃
MRS1/8,1/4：－55
＋0
℃
－5
（30min.）
－0
（30min.） 5 cycles
MRS1/3：－55
＋0
℃
（30min.）
/＋125
＋3
℃
－5
－0
（30min.） 50 cycles
500V
（a.c.） 1min. between terminals and coatings
for
70℃±2℃, １000h
1.5h ON/0.5h OFF cycle
40℃±2℃, 90%½95%RH, 1000h
1.5h ON/0.5h OFF cycle
500V
（d.c.）1min.
,
Soaking in 2-propanol of 20℃½25℃ for 180s±10s
■Precautions for Use
・
Ionic impurities such as flux etc. that are attached to these products or those mounted onto a PCB, negatively affect their moisture resistance, corrosion
resistance, etc. The flux may contain ionic substances like chlorine, acid, etc. Please wash them to get rid of these ionic substances especially when using lead-
free solder that may contain much of the said substances for improving a wetting characteristic. Using RMA solder or RMA flux, or well-washing is needed. Also,
attaching ionic substances such as perspiration, salt etc. by storage environments or mounting conditions/environments negatively affects their moisture
resistance, corrosion resistance etc. Please wash them to remove the ionic substances when they are polluted.
＋
−
・
Pay attention to use when the components are polluted by ionic impurities like sodium (Na ), chlorine (Cl ) etc. included in perspiration and saliva, because it
leads to electric erosion.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Oct. 2020
Oct. 2021
www.koaglobal.com
147
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