![](http://datasheet.mmic.net.cn/200000/WRM0207C-1K0BI_datasheet_15115560/WRM0207C-1K0BI_2.png)
Mini Melf
Resistors
WRM Series
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue D 09.06
Welwyn Components
TCR and Tolerance Range
* TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C.
* Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1
Performance Data
e
c
n
a
r
e
l
o
T
R
C
T
e
p
y
T
Reference
5%
2%
1.0%
0.5%
0.25%
0.1%
WRM0102
±50ppm
R22 – R91
IRO – 9R1
10R – 2.21M
47RS – 221K
100R – 221K
–
WRM0102
±25ppm
–
10R – 221K
47R5 – 221K
100R – 221K
100R – 100K
WRM0102
±15ppm
–
100R – 100K
WRM0102
±10ppm
–
WRM0102
±05ppm
–
WRM0204
±50ppm
R22 – R91
–
1R – 10M
10R – 475K
22R – 332K
43R – 332K
WRM0204
±25ppm
–
10R – 475K
22R – 332K
43R – 332K
WRM0204
±15ppm
–
10R – 221K
22R – 221K
43R – 221K
WRM0204
±10ppm
–
22R – 221K
43R – 221K
WRM0204
±05ppm
–
100R – 100K
WRM0207
±50ppm
R22 – R91
–
1R – 8.2M
10R – 1M
–
WRM0207
±25ppm
–
10R – 1M
–
WRM0207
±15ppm
–
WRM0207
±10ppm
–
WRM0207
±05ppm
–
Test
Results
R/R ±
Stability class
0
.
1
5
.
0
5
2
.
0
n
o
it
p
ir
c
s
e
D
10 – <75
0.22 – <10
75 – <100 k
>100 k – 332 k
>332 k – 10 M
Short time overload*
≤ 0.05% + 0.01
≤ 0.1% + 0.01
≤ 0.25% + 0.05
Bending test*
≤ 0.05% + 0.01
≤ 0.1% + 0.01
≤ 0.25% + 0.05
Resistance to soldering heat
≤ 0.05% + 0.01
≤ 0.1% + 0.01
≤ 0.25% + 0.05
Temperature rapid change
≤ 0.05% + 0.01
≤ 0.1% + 0.01
≤ 0.25% + 0.05
Endurance*
Load life
1000h
≤ 0.25% + 0.05
≤ 0.5% + 0.05
8000 h
≤ 0.5% + 0.05
≤ 1.0% + 0.05
Climatic sequence*
≤ 0.25% + 0.05
≤ 0.5% + 0.05
≤ 1.0% + 0.05
Damp heat steady state*
≤ 0.25% + 0.05
≤ 0.5% + 0.05
≤ 1.0% + 0.05
V
/
V
3
<
V
/
V
5
2
.
0
<
V
/
V
5
0
.
0
<
e
s
i
o
n
t
n
e
r
u
C
h
t
o
m
s
a
h
ti
w
d
e
r
e
v
o
c
e
b
ll
a
h
s
a
e
r
a
d
e
p
i
D
y
ti
li
b
a
r
e
d
l
o
S
and bright solder coating of at least 96%
0
1
.
5
.
0
<
t
n
e
i
c
if
f
e
o
c
e
g
a
tl
o
V
6/V
f
o
r
p
e
g
a
tl
o
V
200V
300V
500V