Pulse Withstanding
Chip Resistors
PWC Series
Excellent pulse withstand performance
Improved working voltage
Improvedpowerrang
Custom designs available
An-sulphurversionavailable
Pulse Withstanding
Chip Resistors
PWC Series
Excellent pulse withstand performance
Improved working voltage
Improved power rating
Standard chip sizes (0805 to 2512)
Custom designs available
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© 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
Electrical Data
07. 08
A subsidiary of
TT electronics plc
37
Physical Data
Construction
Thick film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate. Wrap-around
terminations have an electroplated nickel barrier and solder
coating, this ensures excellent ‘leach’ resistance properties
and solderability.
Marking
Components are not marked. Reels are marked with type,
value, tolerance, date code and quantity.
Solvent Resistance
The body protection is resistant to all normal industrial
cleaning solvents suitable for printed circuits.
Dimensions of PWC resistors are given below in mm and weight in g
L W T max A B C Wt.
PWC0805PWC0603Size
Power @70°C W
Resistance range ohms
Tolerance %
LEV V
TCR ppm/°C
Operating temperature °C
Thermal Impedance °C/W
Pad / trace area *
Values
0.25
150 200 400 500
1R0 to 10M
10R to 1M: 0.5, All values: 1, 5
<10R:200 ≥10R:100
E96 preferred - other values to special order
See graphs – full application note available on request
-55 to +155
0.33 0.5 0.75 1.5 21
220 160 145 80 55 4070
40
0.125
75
302
30 50 125 60 100 500250
mm2
PWC1206 PWC2010 PWC2512
2.0±0.3 1.25±0.2 0.6 0.3±0.15 0.9 min 0.3±0.1 0.009
1206
0805
1.5±0.1 0.8±0.1 0.3±0.15 0.3±0.15 0.0020.55 0.6 min
0603
3.2±0.4 1.6±0.2 0.7 0.4±0.2 1.7 min 0.4±0.15 0.020
2010 5.1±0.3 2.5±0.2 0.8 0.6±0.3 3.0 min 0.6±0.25 0.036
2512 6.5±0.3 3.2±0.2 0.8 0.6±0.3 4.4 min 0.6±0.25 0.055
Pulse Capability
T
W
C
A
A
L
B
Wrap-around terminations
(3 faces)
*Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB
Welwyn Components
Note that anti-sulphur version parts below 100R are
produced in flip-chip format with the resistor element on
the underside.
Resistors
AllPb-freepartscomplywithEUDirecve2011/65/EU(RoHS2)
11.16
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
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Pulse Withstanding
Chip Resistors
PWC Series
Pulse Withstanding
Chip Resistors
PWC 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 07. 08
Performance Data
Welwyn Components
Pulse Performance Data
Lightning Surge
lightning surge resistors are tested in
accordance with IEC 60 115-1 using
both 1.2/50µs and 10/700µs pulse shapes.
10 pulses are applied. The limit of
acceptance is a shift in resistance of less
than 1% from the initial value.
Size Maximum Typical
Loadatratedpower:1000hoursat70°C ΔR%1 0.25
Shelflifetest:12monthsatroomtemperature ΔR%0.1 0.02
Derangfromratedpowerat70°C Zeroat155°C
Overload:6.25xratedpowerfor2seconds ΔR%1 0.1
Dryheat:1000hoursat155°C ΔR%1 0.2
Long term damp heat ΔR%1 0.25
Temperature rapid change ΔR%0.25 0.05
Resistancetosolderheat ΔR%0.25 0.05
Resistancetosulphur-bearinggas(ASversiononly):ASTM-B-809 0.25 0.05
Voltage proof Volts 500
Note:A0.01Ohmaddiontobeaddedtotheperformanceofallresistors<10Ohms.
PulsePerformanceData
LightningSurge
lightningsurgeresistorsaretestedinaccordancewithIEC60115-1usingboth1.2/50µsand10/700µspulseshapes.10pulsesareapplied.Thelimitof
acceptanceisashiinresistanceoflessthan1%fromtheinialvalue.
2512
2010
1206
0805
0603
2512
2010
1206
0805
0603
11.16
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
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
SingleImpulse
Thesingleimpulsegraphistheresultof50impulsesofrectangularshapeappliedatoneminuteintervals.Thelimitofacceptancewasashiin
resistanceoflessthan1%fromtheinialvalue.
ConnuousLoadDuetoRepevePulses
Theconnuousloadgraphwasobtainedbyapplyingrepeverectangularpulseswherethepulseperiodwasadjustedsothattheaverage
powerdissipatedintheresistorwasequaltoitsratedpowerat70°C.Againthelimitofacceptancewasashiinresistanceoflessthan1%fromthe
inialvalue
Pulse Withstanding
Chip Resistors
PWC Series
2512
2010
1206
0805
0603
2512
2010
1206
0805
0603
11.16
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
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Temperature Derating Curve
125
Ambient Temperature /°C
% of Rated Power
75
50
25
0
100
5510751-
Pulse Withstanding
Chip Resistors
PWC 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
Thermal Performance Data
09. 09
Welwyn Components
ApplicaonNote
PWC resistors themselves can operate atamaximumtemperatureof155°C.Forsolderedresistors,thejointtemperatureshouldnotexceed110°C.This
condionismetwhenthestatedpowerlevelsat70°Candrecommendedpadandtraceareasareused.Padandtraceareaisdenedasthetotalareaof
thesolderpadplusallcoppertracewithintwosquaresoftheedgeofthesolderpad.Allowanceshouldbemadeifsmallerareasofcopperareused.
AfullApplicaonNoteonthePWCSeriesisavailable.
Packaging
0603,0805and1206resistorsaresuppliedon8mmcarriertapeand2010and2512resistorsaresuppliedon12mmcarriertape,
allon7inchreelsasperIEC286-3.
Ordering Procedure
This product has two valid part numbers:
Pulse Withstanding
Chip Resistors
PWC Series
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: PWC2512-2K0JI (2512, 2 kilohms ±5%, Pb-free)
P
W
2
5
1
2
-
2
K
0
J
I
1
2
3
4
5
6
USA (IRC) Part Number: PWC-PWC2512LF-2K00-J (2512, 2 kilohms ±5%, Pb-free)
P
W
-
P
W
C
2
5
1
2
L
F
-
2
0
0
-
J
1
2
3
4
5
6
1
2
3
4
5
6
Type
Size Anti-Sulphur Value Tolerance
Termination & Packing
PWC
0603
Omit for standard
E24 = 3/4 characters
D = ±0.5%
AS = Anti-sulphur
E96 = 3/4 characters
F = ±1%
0805, 1206,
2010
3000/reel
R = ohms
J = ±5%
K = kilohms
2512
0603
1800/reel
M = megohms
All sizes
1000/reel
1
2
3
4
5
6
Family
Model Size Termination Value Tolerance Packing
PWC
PWC
Omit for SnPb
D = ±0.5%
Plastic tape
LF = Pb-free
F = ±1%
1206, 2010
3000/reel
J = ±5%
2512
1800/reel
I = Standard,
T1
E24 = 4 characters
E96 = 4 characters
R = ohms
K = kilohms
M = megohms
2512
2010
1206
08055000/reel
1206
2010
2512
11.16
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
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn