MELF Resistors
WRM Series
AEC-Q200
High reliability
Predictable pulse handling capability
Tolerances down to 0.1%
TCR down to 5 ppm/°C
Resistors
All parts are Pb-free and comply with EU Direcve 2011/65/EU (RoHS2)
BI Technologies IRC Welwyn
03.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF Resistors
WRM Series
AEC-Q200
High reliability
Predictable pulse handling capability
Tolerances down to 0.1%
TCR down to 5 ppm/°C
Resistors
BI Technologies IRC Welwyn
11.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF Resistors
WRM Series
High reliability
Predictable pulse handling capability
Tolerances down to 0.1%
TCR down to 5 ppm/°C
Dimensions (mm) and weight (g)
Type L D D1K Weight
max max max min
WRM 0102 2.3 1.35 1.3 0.3 0.01
WRM 0204 3.7 1.55 1.55 0.5 0.02
WRM 0207 6.1 2.4 2.4 0.5 0.08
MELF
Resistors
WRM Series
•High reliability
•Predictable pulse handling capability
•Tolerances down to 0.1%
•TCR down to 5 ppm/°C
WRM 0102 WRM 0204 WRM 0207
4.052.0 0.2
sttawC°07 ta gnitar rewoP
M10
–
22RM5 1
–
R22
8R2 - 1M0
smhoegnar ecnatsiseR
052002200stlovegatlov tnemele gnitimiL
0, 1005 ,52
0, 1005 ,52 ,51 ,5
15, 25, 50, 100
C°/mppRCT
0.1, 0.25, 0.5, 1, 5
%ecnarelot ecnatsiseR
Standard values E24 & E96
04100205
15
2 4
2W/kecnadepmi lamrehT
-55 to +125-55 to +155
C°egnar erutarepmet tneibmA
Zero ohm jumper current rating amps
Zero ohm jumper maximum residual resistance mΩ
01>smhoecnatsiser noitalusnI 10
Electrical Data
Physical Data
Welwyn Components
L
K
L1
D
D1
Construction
A metal film is deposited onto a high dissipation ceramic
former to which tin plated teminating caps are fitted.
The resistor is adjusted to value by a helical cut in the film
and the body is protected by a lacquer coating.
Marking
Resistance values are colour coded with four bands,
three indicating value and one indicating the multiplier.
(Note this describes standard marking, but certain values
may still be supplied with the addition of a tolerance band
following the multiplier.)
Terminations
Material Plated steel cap.
Solderability The pure tin finish produces ageing free
contacts on which low melting solders can
be used. Dipped area shall be covered with
a smooth and bright solder coating after
3 seconds immersion at 215°C.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuit boards.
,01 ,51
Resistors
BI Technologies IRC Welwyn
09.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
Dimensions (mm) and weight (g)
Type L
max
D
max
D1
max
K
min
L1
min
Weight
WRM 0102 2.3 1.35 1.3 0.3 1.1 0.01
WRM 0204 3.7 1.55 1.55 0.5 1.5 0.02
WRM 0207 6.1 2.4 2.4 0.5 2.9 0.08
Dimensions (mm) and weight (g)
Type L D D1K Weight
max max max min
WRM 0102 2.3 1.35 1.3 0.3 0.01
WRM 0204 3.7 1.55 1.55 0.5 0.02
WRM 0207 6.1 2.4 2.4 0.5 0.08
MELF
Resistors
WRM Series
•High reliability
•Predictable pulse handling capability
•Tolerances down to 0.1%
•TCR down to 5 ppm/°C
WRM 0102 WRM 0204 WRM 0207
4.052.0 0.2
sttawC°07 ta gnitar rewoP
M10
–
22RM5 1
–
R22
40R - 1M0
smhoegnar ecnatsiseR
052002200stlovegatlov tnemele gnitimiL
0, 1005 ,52
0, 1005 ,52 ,51 ,5
15, 25, 50, 100
C°/mppRCT
0.1, 0.25, 0.5, 1, 5
%ecnarelot ecnatsiseR
Standard values E24 & E96
04100205
15
2 4
2W/kecnadepmi lamrehT
-55 to +125-55 to +155
C°egnar erutarepmet tneibmA
Zero ohm jumper current rating amps
Zero ohm jumper maximum residual resistance mΩ
01>smhoecnatsiser noitalusnI 10
Electrical Data
Physical Data
Welwyn Components
L
K
L1
D
D1
Construction
A metal film is deposited onto a high dissipation ceramic
former to which tin plated teminating caps are fitted.
The resistor is adjusted to value by a helical cut in the film
and the body is protected by a lacquer coating.
Marking
Resistance values are colour coded with four bands,
three indicating value and one indicating the multiplier.
(Note this describes standard marking, but certain values
may still be supplied with the addition of a tolerance band
following the multiplier.)
Terminations
Material Plated steel cap.
Solderability The pure tin finish produces ageing free
contacts on which low melting solders can
be used. Dipped area shall be covered with
a smooth and bright solder coating after
3 seconds immersion at 215°C.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuit boards.
,01 ,51
Dimensions (mm) and weight (g)
Type L D D1K Weight
max max max min
WRM 0102 2.3 1.35 1.3 0.3 0.01
WRM 0204 3.7 1.55 1.55 0.5 0.02
WRM 0207 6.1 2.4 2.4 0.5 0.08
MELF
Resistors
WRM Series
•High reliability
•Predictable pulse handling capability
•Tolerances down to 0.1%
•TCR down to 5 ppm/°C
WRM 0102 WRM 0204 WRM 0207
4.052.0 0.2
sttawC°07 ta gnitar rewoP
M10
–
22RM5 1
–
R22
40R - 1M0
smhoegnar ecnatsiseR
052002200stlovegatlov tnemele gnitimiL
0, 1005 ,52
0, 1005 ,52 ,51 ,5
15, 25, 50, 100
C°/mppRCT
0.1, 0.25, 0.5, 1, 5
%ecnarelot ecnatsiseR
Standard values E24 & E96
04100205
15
2 4
2W/kecnadepmi lamrehT
-55 to +125-55 to +155
C°egnar erutarepmet tneibmA
Zero ohm jumper current rating amps
Zero ohm jumper maximum residual resistance mΩ
01>smhoecnatsiser noitalusnI 10
Electrical Data
Physical Data
Welwyn Components
L
K
L1
D
D1
Construction
A metal film is deposited onto a high dissipation ceramic
former to which tin plated teminating caps are fitted.
The resistor is adjusted to value by a helical cut in the film
and the body is protected by a lacquer coating.
Marking
Resistance values are colour coded with four bands,
three indicating value and one indicating the multiplier.
(Note this describes standard marking, but certain values
may still be supplied with the addition of a tolerance band
following the multiplier.)
Terminations
Material Plated steel cap.
Solderability The pure tin finish produces ageing free
contacts on which low melting solders can
be used. Dipped area shall be covered with
a smooth and bright solder coating after
3 seconds immersion at 215°C.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuit boards.
,01 ,51
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
03.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
11.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF
Resistors
WRM Series
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 01.11
Welwyn Components
* Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1
Performance Data
Test Results ∆R/R ±
0204 & 0207: 10R - <75R
& >100K - 332K
0102: 40R - 1M0, 0204 &
0207: R22 - <10R & >332K - 10M
0204 & 0207: 75R - 100K
Short time overload* ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Bending test* ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Resistance to soldering heat ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Temperature rapid change ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Endurance*
Load life 1000h ≤0.25% + 0.05 Ω ≤ 0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω
8000 h ≤0.5% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
Climatic sequence* ≤0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
Damp heat steady state* ≤0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
V/Vµ 3 <V/Vµ 52.0 <V/Vµ 50.0 <esion tnerruC
htooms a htiw derevoc eb llahs aera deppiDytilibaredloS
and bright solder coating of at least 96%
01 . 5.0 <tneiciffeoc egatloV 6/V
foorp egatloV No flashover or breakdown
TCR and Tolerance Range
Type
Reference TCR Tolerance
5% 1.0% 0.5% 0.25% 0.1%
WRM0102
±15ppm - 100R - 56K 100R - 56K 100R - 56K 100R - 56K
±25ppm - 100R - 82K 100R - 100K 100R - 82K 100R - 82K
±50ppm 10R - 1M0 10R - 1M0 8R2 - 1M0 - -
±100ppm 10R - 1M0 10R - 1M0 - - -
WRM0204
±100ppm R22 – R91 - - - -
±50ppm - 1R – 5M1
4R7 – 500K
10R – 1M6 22R – 332K 43R – 332K
±25ppm - 10R – 500K 22R – 402K 43R – 332K
±15ppm - - 10R – 221K 22R – 221K 43R – 221K
±10ppm - - - 22R – 221K 43R – 221K
±05ppm - - - 100R – 100K 100R – 100K
WRM0207
±100ppm R22 – R91 - - - -
±50ppm - 1R-10M 10R - 1M6 - -
±25ppm - 10R - 1M 10R – 680K 51R1 - 330K 100R - 100K
±15ppm - - 51R1 - 10K 51R1 - 10K 100R - 10K
MELF
Resistors
WRM Series
* TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C.
BI Technologies IRC Welwyn
03.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
09.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
* AEC-Q200 approval applies to all values up to and including 3M4 at TCRs above 5ppm/°C and to zero ohm jumpers
Test
∆R/R
0102
75R – 100K 10R - <75R &
>100K - 332K <10R & >332K All values
Short �me overload*
≤0.05% + 0.01Ω
≤0.1% + 0.01Ω
≤0.25% + 0.05Ω
≤0.25% + 0.05Ω
Bending test*
≤0.05% + 0.01Ω
≤0.1% + 0.01Ω
≤0.25% + 0.05Ω
≤0.25% + 0.05Ω
Resistance to soldering
heat
≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω
Temperature rapid
change
≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω
Endurance*
Load life 1000h
≤0.15% + 0.05Ω
≤0.
1
5% + 0.05Ω
≤0.
3%
+ 0.05Ω
≤0.5% + 0.05Ω
8000h
≤0.
3
% + 0.05Ω
≤0.
3
% + 0.05Ω
≤0
.6 % + 0.05Ω
≤1.0% + 0.05Ω
225,000h
≤0.
9% + 0.05Ω
≤0.
9
% + 0.05Ω
≤1.8
% + 0.05Ω
≤3
.0% + 0.05Ω
Clima�c sequence*
≤0.25% + 0.05Ω
≤0.5% + 0.05Ω
≤1.0% + 0.05Ω
≤1.0% + 0.05Ω
Damp heat steady
state*
≤0.25% + 0.05Ω ≤0.5% + 0.05Ω ≤1.0% + 0.05Ω ≤1.0% + 0.05Ω
Current noise
<0.05µV/V <0.25µV/V <3µV/V <3µV/V
Solderability
>95% coverage
Voltage coefficient
0 to -0.5ppm/V
Voltage proof
No flashover or breakdown
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
11.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF
Resistors
WRM Series
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 01.11
Welwyn Components
* Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1
Performance Data
Test Results ∆R/R ±
0204 & 0207: 10R - <75R
& >100K - 332K
0102: 40R - 1M0, 0204 &
0207: R22 - <10R & >332K - 10M
0204 & 0207: 75R - 100K
Short time overload* ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Bending test* ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Resistance to soldering heat ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Temperature rapid change ≤0.05% + 0.01 Ω ≤ 0.1% + 0.01 Ω ≤ 0.25% + 0.05 Ω
Endurance*
Load life 1000h ≤0.25% + 0.05 Ω ≤ 0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω
8000 h ≤0.5% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
Climatic sequence* ≤0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
Damp heat steady state* ≤0.25% + 0.05 Ω ≤ 0.5% + 0.05 Ω ≤ 1.0% + 0.05 Ω
V/Vµ 3 <V/Vµ 52.0 <V/Vµ 50.0 <esion tnerruC
htooms a htiw derevoc eb llahs aera deppiDytilibaredloS
and bright solder coating of at least 96%
01 . 5.0 <tneiciffeoc egatloV 6/V
foorp egatloV No flashover or breakdown
TCR and Tolerance Range
Type
Reference TCR Tolerance
5% 1.0% 0.5% 0.25% 0.1%
WRM0102
±15ppm - 100R - 56K 100R - 56K 100R - 56K 100R - 56K
±25ppm - 100R - 82K 100R - 100K 100R - 82K 100R - 82K
±50ppm 10R - 1M0 10R - 1M0 8R2 - 1M0 - -
±100ppm 10R - 1M0 10R - 1M0 - - -
WRM0204
±100ppm R22 – R91 - - - -
±50ppm - 1R – 5M1
4R7 – 500K
10R – 1M6 22R – 332K 43R – 332K
±25ppm - 10R – 500K 22R – 402K 43R – 332K
±15ppm - - 10R – 221K 22R – 221K 43R – 221K
±10ppm - - - 22R – 221K 43R – 221K
±05ppm - - - 100R – 100K 100R – 100K
WRM0207
±100ppm R22 – R91 - - - -
±50ppm - 1R-10M 10R - 1M6 - -
±25ppm - 10R - 1M 10R – 680K 51R1 - 330K 100R - 100K
±15ppm - - 51R1 - 10K 51R1 - 10K 100R - 10K
MELF
Resistors
WRM Series
* TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C.
BI Technologies IRC Welwyn
03.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
09.17
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
* AEC-Q200 approval applies to all values up to and including 3M4 at TCRs above 5ppm/°C and to zero ohm jumpers
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
03.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
11.17
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
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 01.11
Welwyn Components
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Continuous Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
Single Pulse
Maximum Pulse Load
Continuous Pulses
Maximum Pulse Load
Type WRM 0204 C - 1K0 F I
Size
TCR
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
C 50ppm/ºC T 10ppm/ºC
D 25ppm/ºC V 5ppm/ºC
Y 15ppm/ºC
Z 100ppm/ºC
B 0.1% D 0.5%
C 0.25% F 1%
J 5%
0102 3000 / reel (7”)
ITape 0204 3000 / reel (7”)* Standard
0207 1500 / reel (7”)
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
* High precision parts may be supplied on 1000 piece reels – please enquire
Packaging
The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape.
WRM 0207 resistors are supplied on 12mm blister tape.
Packaging complies with the requirements of IEC 286-3.
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 01.11
Welwyn Components
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Continuous Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
Single Pulse
Maximum Pulse Load
Continuous Pulses
Maximum Pulse Load
Type WRM 0204 C - 1K0 F I
Size
TCR
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
C 50ppm/ºC T 10ppm/ºC
D 25ppm/ºC V 5ppm/ºC
Y 15ppm/ºC
Z 100ppm/ºC
B 0.1% D 0.5%
C 0.25% F 1%
J 5%
0102 3000 / reel (7”)
ITape 0204 3000 / reel (7”)* Standard
0207 1500 / reel (7”)
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
* High precision parts may be supplied on 1000 piece reels – please enquire
Packaging
The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape.
WRM 0207 resistors are supplied on 12mm blister tape.
Packaging complies with the requirements of IEC 286-3.
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 01.11
Welwyn Components
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Continuous Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
Single Pulse
Maximum Pulse Load
Continuous Pulses
Maximum Pulse Load
Type WRM 0204 C - 1K0 F I
Size
TCR
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
C 50ppm/ºC T 10ppm/ºC
D 25ppm/ºC V 5ppm/ºC
Y 15ppm/ºC
Z 100ppm/ºC
B 0.1% D 0.5%
C 0.25% F 1%
J 5%
0102 3000 / reel (7”)
ITape 0204 3000 / reel (7”)* Standard
0207 1500 / reel (7”)
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
* High precision parts may be supplied on 1000 piece reels – please enquire
Packaging
The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape.
WRM 0207 resistors are supplied on 12mm blister tape.
Packaging complies with the requirements of IEC 286-3.
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 01.11
Welwyn Components
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
100
10
1
0,1
10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s
Pulse Duration ti
Continuous Pulse Load Pmax
WRM 0102
WRM 0204
WRM 0207
W
Single Pulse
Maximum Pulse Load
Continuous Pulses
Maximum Pulse Load
Type WRM 0204 C - 1K0 F I
Size
TCR
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
C 50ppm/ºC T 10ppm/ºC
D 25ppm/ºC V 5ppm/ºC
Y 15ppm/ºC
Z 100ppm/ºC
B 0.1% D 0.5%
C 0.25% F 1%
J 5%
0102 3000 / reel (7”)
ITape 0204 3000 / reel (7”)* Standard
0207 1500 / reel (7”)
Ordering Procedure
Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/ºC TCR on a reel of 3000 pieces -
* High precision parts may be supplied on 1000 piece reels – please enquire
Packaging
The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape.
WRM 0207 resistors are supplied on 12mm blister tape.
Packaging complies with the requirements of IEC 286-3.
MELF
Resistors
WRM Series
BI Technologies IRC Welwyn
09.17
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
Changes to add zero ohm jumpers to WRM
1. Electrical Data Table – add 2 rows to bottom of table:
WRM0102
WRM0204
WRM0207
Zero ohm jumper current rating amps
2
4
Zero ohm jumper maximum residual resistance mΩ
15
2. Replace Ordering Procedure section:
Ordering Procedure
Example: WRM0204C-1K0FI (WRM0204, 50ppm/°C, 1 kilohm ±1%, Pb-free)
WRM0204-R000I (WRM0204, zero ohm jumper, Pb-free)
W
R
M
0
2
0
4
C
-
1
K
0
F
I
1
2
3
4
5
1
2
3
4
5
Type TCR Value Tolerance Packing
WRM0102
V = ±5ppm/°C
3/4 characters
R = ohms
K = kilohms
M = megohms
B = ±0.1%
I = Standard
WRM0204
T = ±10ppm/°C
C = ±0.25%
0102
3000 / 7” reel
WRM0207
Y = ±15ppm/°C
D = ±0.5%
0204
3000 / 7” reel1
D = ±25ppm/°C
F = ±1%
0207
1500 / 7” reel
C = ±50ppm/°C
R000 = Jumper
J = ±5%
Z = ±100ppm/°C
Omit for Jumper
Omit for Jumper
Note 1: High precision parts may be supplied on 1000 piece reels – please enquire