MELF
Resistors
MELF
Resistors
Resistors
MELF Resistors
WRM Series
WRM Series
WRM Series
• •
High reliability
High reliability
High reliability
AEC-Q200
Predictable pulse handling capability
• •
Predictable pulse handling capability
Predictable
down to 0.1%
High reliability
Tolerances
pulse handling capability
• •
Tolerances down to 0.1%
Tolerances pulse handling
Predictabledown to 0.1% capability
TCR down to 5 5 ppm/°C
• •
TCR down to ppm/°C
TCR down down to 0.1%
Tolerances to 5 ppm/°C
TCR down to 5 ppm/°C
Welwyn Components
Welwyn Components
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Electrical Data
WRM 0102
WRM 0102
Pe w a ng at at C
Powor rertirating 70°70°C
ResResintanranrange
ista s ce ce ge
LimLtmiting memevoltagtage
i i ing ele el nt nt vol e
T
TCR CR
ResResintantoleraerance
ista s ce ce tolnce
Standard values
Standard values
T m rl i al i edance
Therheammpmpedance
AmAmntetetmempeuaeurranrange
bie bi n tperat r r t e ge
I l sulat r n sta s ce
Insunationioesiresintance
Zero ohm jumper current rating
Zero ohm jumper current rating
Zero ohm jumper maximum residual resistance
Zero ohm jumper maximum residual resistance
k
k/W /W
°C °C
os
ohmhms
amps
amps
m m
2
250 50
-55-55 +155
to to +155
2 2
15 15
wa
watts tts
os
ohmhms
v
voltsolts
0.20.2
40R - 1M0
40R
8R2 - 1M0
200
200
WRM 0204
WRM 0204
0.20.25
5
R22 – 1
R22 – 5M5M1
2
200 00
0 5 5, 5, 100
5,15,10,125,250,50, 100
0.1, 0.25, 0.5, 1,
0.1, 0.25, 0.5, 1, 5 5
E24 & E96
E24 & E96
2
200 00
-55-55 +125
to to +125
>1
>10
10
0
10
4 4
1
140 40
WRM 0207
WRM 0207
0.40.4
R – 10 10
R22 22 – M M
2
250 50
15,15,,250,50, 100
25 5, 100
p /°C
ppmpm/°C 15,15, 25, 50, 100
25, 50, 100
%%
Physical Data
Physical Data
Dimensions (mm) and weight
Dimensions
and weight (g)
Dimensions (mm) and weight (g)
(g)
Type
Type
Type
WRM 0102
WRM 0102
WRM 0102
WRM 0204
WRM 0204
WRM 0204
WRM 0207
WRM 0207
WRM 0207
L
L L
max
max
max
2.3
2.3
2.3
3.7
3.7
3.7
6.1
6.1
6.1
D
D D
max
max
max
1.35
1.35
1.35
1.55
1.55
1.55
2.4
2.42.4
D
1
D
1
D
1
max
max
max
1.3
1.31.3
1.55
1.55
1.55
2.4
2.42.4
K
min
0.3
0.5
0.5
L
1
K K
min
min
min
Weight
Weight
Weight
0.01
0.01
0.01
0.02
0.02
0.02
0.08
0.08
0.08
L L
D
1
D
1
L
1
L
1
K K
D D
0.30.3
1.1
0.50.5
1.5
0.50.5
2.9
Construction
Construction
A metal film is deposited onto a high dissipation ceramic
A metal film is deposited onto a high dissipation ceramic
former which tin plated teminating caps are fitted.
former to to which tin plated teminating caps are fitted.
The resistor is adjusted value by a a helical in in the film
The resistor is adjusted to to value byhelical cutcut the film
and the body is protected a a lacquer coating.
and the body is protected by bylacquer coating.
Terminations
Terminations
Marking
Marking
Resistance values colour coded with four bands,
Resistance values areare colour coded with four bands,
three indicating value and one indicating the multiplier.
three indicating value and one indicating the multiplier.
(Note this describes standard marking, but certain values
(Note this describes standard marking, but certain values
may still supplied with the addition of of a tolerance band
may still be be supplied with the addition a tolerance band
following the multiplier.)
following the multiplier.)
Material
Plated steel cap.
Material
Plated steel cap.
Solderability
The pure finish produces ageing free
Solderability
The pure tin tin finish produces ageing free
contacts which low melting solders can
contacts on on which low melting solders can
be be used. Dipped area shall be covered with
used. Dipped area shall be covered with
a smooth and bright solder coating after
a smooth and bright solder coating after
3 seconds immersion at 215°C.
3 seconds immersion at 215°C.
Solvent Resistance
Solvent Resistance
The body protection and marking resistant to all normal
The body protection and marking areare resistant to all normal
industrial cleaning solvents suitable printed circuit boards.
industrial cleaning solvents suitable forfor printed circuit boards.
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
www.ttelectronics.com/resistors
© TT Electronics plc
© TT Electronics plc
11.17
09.17
MELF
MELF
Resistors
Resistors
WRM Series
WRM Series
Welwyn Components
TCR and Tolerance Range
Type
Reference
TCR
5%
10R - 1M0
10R - 1M0
-
-
R22 – R91
-
-
-
-
-
R22 – R91
-
-
-
1.0%
10R - 1M0
10R - 1M0
100R - 82K
100R - 56K
-
1R – 5M1
4R7 – 500K
-
-
-
-
1R-10M
10R - 1M
-
Tolerance
0.5%
-
8R2 - 1M0
100R - 100K
100R - 56K
-
10R – 1M6
10R – 500K
10R – 221K
-
-
-
10R - 1M6
10R – 680K
51R1 - 10K
0.25%
-
-
100R - 82K
100R - 56K
-
22R – 332K
22R – 402K
22R – 221K
22R – 221K
100R – 100K
-
-
51R1 - 330K
51R1 - 10K
0.1%
-
-
100R - 82K
100R - 56K
-
43R – 332K
43R – 332K
43R – 221K
43R – 221K
100R – 100K
-
-
100R - 100K
100R - 10K
±100ppm
WRM0102
±50ppm
±25ppm
±15ppm
±100ppm
±50ppm
±25ppm
±15ppm
±10ppm
±05ppm
±100ppm
±50ppm
WRM0207
±25ppm
±15ppm
WRM0204
* TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C.
Performance Data
Test
0204 & 0207: 75R - 100K
Short time overload*
Bending test*
Resistance to soldering heat
Temperature rapid change
Endurance*
Load life
Climatic sequence*
Damp heat steady state*
Current noise
Solderability
Voltage coefficient
Voltage proof
1000h
8000 h
≤
0.25% + 0.05
Ω
≤
0.5% + 0.05
Ω
≤
0.25% + 0.05
Ω
≤
0.25% + 0.05
Ω
< 0.05 µV/V
≤
0.25% + 0.05
Ω
≤
0.5% + 0.05
Ω
≤
0.5% + 0.05
Ω
≤
0.5% + 0.05
Ω
< 0.25 µV/V
Dipped area shall be covered with a smooth
and bright solder coating of at least 96%
< 0.5 . 10
6
/V
No flashover or breakdown
≤
0.5% + 0.05
Ω
≤
1.0% + 0.05
Ω
≤
1.0% + 0.05
Ω
≤
1.0% + 0.05
Ω
< 3 µV/V
≤
0.05% + 0.01
Ω
≤
0.05% + 0.01
Ω
≤
0.05% + 0.01
Ω
≤
0.05% + 0.01
Ω
Results
∆
R/R ±
0204 & 0207: 10R - <75R
& >100K - 332K
≤
0.1% + 0.01
Ω
≤
0.1% + 0.01
Ω
≤
0.1% + 0.01
Ω
≤
0.1% + 0.01
Ω
0102: 40R - 1M0, 0204 &
0207: R22 - <10R & >332K - 10M
≤
0.25% + 0.05
Ω
≤
0.25% + 0.05
Ω
≤
0.25% + 0.05
Ω
≤
0.25% + 0.05
Ω
* Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1
* AEC-Q200 approval applies to all values up to and including 3M4 at TCRs above 5ppm/°C and to zero ohm jumpers
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
www.ttelectronics.com/resistors
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
01.11
11.17
03.17
09.17
11.17
MELF
MELF
MELF
MELF
MELF
Resistors
MELF
Resistors
Resistors
Resistors
Resistors
WRM Series
Resistors
WRM Series
WRM
Series
WRM Series
WRM
Series
WRM Series
Single Pulse
Single Pulse
Load
Maximum Pulse
Single Pulse
Load
Maximum Pulse
Single Pulse
Maximum Pulse Load
PulsePulse Load
max
Load
Pulse Pulse Load
P
max
P
max
Load
P
max
P
100
W
100
W
100
W
10
W
10
10
10
1
1
1
1
0,1
0,1 10
µs
0,1
10
µs
0,1 10
µs
10
µs
100
µs
100
µs
100
µs
100
µs
1 ms
1 ms
1 ms
1 ms
10 ms
10 ms
Pulse Duration
10 ms
100 ms
1s
1s
1s
1s
10 s
10 s
10 s
10 s
100 ms
100 ms
100 ms
Welwyn Components
Welwyn Components
Welwyn Components
Welwyn Components
Maximum Pulse Load
100
WRM 0102
0102
WRM 0204
WRM 0102
0204
WRM 0207
WRM 0204
0102
WRM 0207
WRM 0207
0204
WRM 0207
Pulse Duration
Continuous Pulses
Pulse Duration
Continuous Pulses
Maximum Pulse
Pulses
Load
Continuous
add zero ohm jumpers to WRM
Changes
Pulse Load
Maximum
to
Continuous
Load
Maximum Pulse
Pulses
Continuous PulsePulse Load
P
max
Continuous Load
P P
Continuous Load
Continuous Pulse Pulse Load
maxmax
P
max
Pulse Duration
10 ms
t
i
t
i
t
i
t
i
Maximum Pulse Load
100
100
100
W
100
W
W
10
1. Electrical Data Table – add 2 rows to bottom of table:
WRM 0102
0204
amps
mΩ
WRM 0102
WRM 0102
WRM 0204
0207
WRM 0204
0102
WRM 0207
WRM
WRM0102
0207
0204
WRM 0207
10
Zero
W
ohm jumper current rating
10
Zero ohm jumper maximum residual resistance
10
1
1
1
1
0,1
0,1 10
µs
0,1
10
µs
0,1 10
µs
100
µs
100
µs
100
µs
1 ms
1 ms
1 ms
10 ms
10 ms
Pulse Duration
10 ms
100 ms
100 ms
100 ms
2
WRM0204
15
WRM0207
4
1s
1s
1s
1s
10 s
10 s
10 s
10 s
t
i
Pulse Duration
t
i 100 ms
10
µs
100
µs
1 ms
10 ms
Pulse Duration
t
i
Packaging
Pulse Duration
t
i
Packaging
2. Replace Ordering Procedure section:
Ordering Procedure
Ordering Procedure
Ordering Procedure
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR
kilohm
of 3000 pieces -
Example: WRM0204C-1K0FI
(WRM0204, 50ppm/°C, 1
on a reel
±1%, Pb-free)
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
WRM0204-R000I
(WRM0204, zero ohm
TCR on reel of 3000 pieces -
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC
jumper,
a
Pb-free)
The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape.
Packaging
and 0204 resistors are supplied reeled on 8mm blister tape.
The WRM 0102
WRM 0207 resistors 0204 resistors are supplied reeled on
Packaging
The WRM 0102 and are supplied on 12mm blister tape. 8mm blister tape.
WRM 0207 resistors are supplied on 12mm blister tape.
The WRM complies 0204 resistors are supplied reeled on
WRM 0207 resistorswithsupplied on 12mmof IEC 286-3. 8mm blister tape.
Packaging 0102 and are the requirements blister tape.
WRM 0207 resistors are the requirements of IEC 286-3.
Packaging complies with supplied on 12mm blister tape.
Packaging complies with the requirements of IEC 286-3.
Packaging complies with the requirements of IEC 286-3.
Type
WRM
0204
C - 1K0
F
I
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
Type
WRM
0204
C - 1K0
F
I
Type
WRM
0204
C - 1K0
F
I
Size
Type
WRM
0204
C - 1K0
F
I
Size
W R M 0 2 0 4 C
-
1 K 0
F
I
Size
TCR
Size
TCR
1
2
3
4 5
TCR
100ppm/ºC Y 15ppm/ºC
0102
Z
0102
Z 100ppm/ºC Y 15ppm/ºC
TCR
I
Tape
0204
T 10ppm/ºC
C 100ppm/ºC Y 15ppm/ºC
Z 50ppm/ºC
T 15ppm/ºC
C 100ppm/ºC Y 10ppm/ºC
1
2
Z 50ppm/ºC
V 5ppm/ºC
D 25ppm/ºC
T 10ppm/ºC
C 50ppm/ºC
V 5ppm/ºC
D 25ppm/ºC
Type
TCR
T 10ppm/ºC
C 50ppm/ºC
V 5ppm/ºC
D 25ppm/ºC
Value (use IEC62
V
±5ppm/°C
D 25ppm/ºC
V
code)
=
5ppm/ºC
WRM0102
3
4
Value
3/4 characters
R = ohms
K = kilohms
M = megohms
Tolerance
C 0.1% D 0.5%
1%
B 0.25% F
C = ±50ppm/°C
J 5%
C 0.25% D 1%
F 0.5%
B 0.25% F 1%
0.1%
J 5%
C
Z = ±100ppm/°C
C 0.25% F 1%
Omit for Jumper
© 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
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
High precision parts may be supplied
Northumberland NE22
–
please
©
Note 1:
+44
Components Limited
Bedlington,
on
829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Welwyn
(0) 1670 822181 · Facsimile: +44 (0) 1670
1000 piece reels
7AA, UK
enquire
Telephone:
Telephone: +44
Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn
(0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT Electronics reserves the right to make changes in product specification without notice or liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
Value (use IEC62 code)
Value (use IEC62 code)
WRM0204 T = ±10ppm/°C
Tolerance (use IEC62 code)
Value (use(use IEC62 code)
Tolerance IEC62 code)
WRM0207 Y = ±15ppm/°C
Tolerance (use IEC62 code)
5%
B 0.1% D 0.5%
J
D = ±25ppm/°C
Tolerance (use IEC62 code)
5%
B 0.1% D 0.5%
J
B = ±0.1%
C = ±0.25%
D = ±0.5%
F = ±1%
R000 = Jumper J = ±5%
Omit for Jumper
3000 / reel (7”)
3000 / reel (7”)
0102 3000 / reel (7”)*
3000 / reel (7”)
I
Tape
5
0204 3000 / reel (7”)*
Standard
0102 3000
0207 1500 / reel (7”)
I
Tape
0204 3000 / reel (7”)*
Standard
0207 1500 / reel (7”)
* High precision
Tape
may be
0204
on 1000
/
piece reels – please
Standard
parts
supplied
3000 reel (7”)*
enquire
I
Packing
0207 1500 / reel (7”)
* High precision parts may be supplied on 1000 piece reels – please enquire
* High precision
I
parts may be
0207
on 1000
/
piece reels – please enquire
supplied
= Standard
1500 reel (7”)
* High precision parts may be supplied on 1000 piece reels – please enquire
Packing
Packing
Packing
Packing
Standard
0102
0204
0207
3000 / 7” reel
3000 / 7” reel
1
1500
/ 7” reel
Telephone: +44 (0)
General Note
1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies
General Note
BI Technologies
IRC Welwyn
IRC Welwyn
01.11
01.11
01.11
01.11
www.ttelectronics.com/resistors
www.ttelectronics.com/resistors
© TT Electronics plc
© TT Electronics plc
11.17
09.17
11.17
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