www.vishay.com For technical questions on the WSZ6720, contact: ww1resistors@vishay.com Document Number: 30246
1 For technical questions on the WSZ7532, contact: ww2aresistors@vishay.com Revision: 17-Mar-11
WSZ
Vishay
Wirewound Resistors, Surface Mount,
Silicone or Cement Coated, High Power
FEATURES
• Low cost, high power (up to 3.75 W)
• All welded construction
• Ideal for pulsing application
• Ceramic core
• Available on tape and reel
• AEC-Q200 qualified available (1)
• Compliant to RoHS Directive 2002/95/EC
Note
(1) Flame retardance test may not be applicable to
some resistor technologies.
Notes
(2) Lower TCR or other power range on request. Resistance value to be selected for ± 10 % tolerance from E12 and for ± 5 % from E24.
(3) 1 400 ppm/K.
(4) Power rating depends on the maximum temperature at the solder point, solder pad dimensions, the component placement density and the
substrate material.
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL SIZE
POWER
RATING
P
25 °C
W
RESISTANCE
RANGE
(2)
TCR
- 10 ... - 80
ppm
/K
(3)
(CLASS 1)
RESISTANCE
RANGE
(2)
TCR
100 ... 180
ppm
/K
(CLASS 3)
RESISTANCE
RANGE
TCR
± 50
ppm
/°C
RESISTANCE
RANGE
TCR
± 30
ppm/
°C
TOLERANCE
± %
WEIGHT
(
typical)
g
ENCAPS.
WSZ6720 6720 1.8 (4)
1 to 510 n/a n/a n/a 1
0.6 Cement
0.22 to 510 n/a n/a n/a 2
0.10 to 510 24 to 3.3K n/a n/a 5
0.10 to 510 1.8 to 3.3K n/a n/a 10
WSZ7532 7532 3.75 n/a n/a n/a 10 to 15K 1, 3 0.7 Silicone
n/a n/a 1 to 9.99 10 to 15K 5, 10
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSZ672011509KBM000
GLOBAL MODEL TCR/MATERIAL VALUE TOLERANCE CODE PACKAGING SPECIAL
WSZ6720 1 =
- 10 ... - 80 ppm/K
WM 50
Class 1
3 =
100 ... 180 ppm/K
WM 110
Class 3
3 digit value
1 digit multiplier
MULTIPLIER
7 = *10-3
8 = *10-2
9 = *10-1
0 = *100
1 = *101
2 = *102
3 = *103
F = ± 1.0 %
G = ± 2.0 %
J = ± 5.0 %
K = ± 10.0 %
BM = Lead (Pb)-free,
tape/reel
LX = Lead (Pb)-free,
bulk
3 digits
000 = Standard
Historical Part Numbering example: WSZ6720 WM 50 15 10 % BM
WSZ6720 WM 50 15 10 % BM
HISTORICAL MODEL TCR/MATERIAL VALUE TOLERANCE CODE PACKAGING
Global Part Numbering example: WSZ75321K000JTA
GLOBAL MODEL VALUE TOLERANCE CODE PACKAGING SPECIAL
WSZ7532 R = Decimal
K = Thousand
54R15 = 54.15
1K325 = 1325
F = ± 1.0 %
G = ± 2.0 %
H = ± 3.0 %
J = ± 5.0 %
K = ± 10 %
EA = Lead (Pb)-free, tape/reel
EK = Lead (Pb)-free, bulk
TA = Tin/lead, tape/reel
BA = Tin/lead, bulk
(Dash number)
(Up to 3 digits)
From 1 to 999
as applicable
* Pb containing terminations are not RoHS compliant, exemptions may apply
** Please see document “Vishay Material Category Policy”: www.vishay.com/doc?99902
7201 5091Z6 BM 0KS 00W
5321 000KZ7 TAJSW
Document Number: 30246 For technical questions on the WSZ6720, contact: ww1resistors@vishay.com www.vishay.com
Revision: 17-Mar-11 For technical questions on the WSZ7532, contact: ww2aresistors@vishay.com 2
WSZ
Wirewound Resistors, Surface Mount,
Silicone or Cement Coated, High Power Vishay
DIMENSIONS
TEMPERATURE RISE DERATING
Note
(1) Embossed carrier tape per EIA-481.
D
A
B
I
E C
Z
b
a
PIN PLANE
≤ 0.4
MODEL DIMENSIONS in millimeters [inches]
Amax. BC
max. Dnom. EZ
WSZ6720
13.2
[0.512]
17 ± 0.5
[0.670]
4.8
[0.189]
0.8
[0.031]
5 ± 0.5
[0.20 ± 0.02]
3.6 ± 0.5
[0.142 ± 0.02]
WSZ7532
14.27
[0.562]
19.86
[0.782]
4.78
[0.188]
0.813
[0.032]
8.18
[0.322]
6.5
[0.256]
MODEL SOLDER PAD DIMENSIONS in millimeters [inches]
ab l
WSZ6720
10 [0.394] 10 [0.394] 14.5 [0.57]
WSZ7532
4.0 [0.157] 9.50 [0.374] 15.05 [0.593]
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSZ6720 WSZ7532
Temperature Coefficient ppm/°C See Standard Electrical Specifications table
Operating Temperature Range °C - 55 to + 250 - 65 to + 350
Maximum Working Voltage V (P x R)1/2
Terminal Strength lb 10 minimum
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
WSZ6720 WSZ7532
Temperature Cycling - 55 °C to + 125 °C, 5 cycles, 15 min at each extreme ± 3 % R± (2 % + 0.05 ) R
High Temperature Exposure 1000 h at + 250 °C ± 3 % R± (2 % + 0.05 ) R
Short Time Overload 5 x rated power for 5 s ± 1 % R± (2 % + 0.05 ) R
Shock, Specified Pulse 100 g’s for 6 ms, 10 shocks ± 1 % R± (2 % + 0.05 ) R
Vibration, High Frequency Frequency varied 10 Hz to 2000 Hz, 20 g peak, 2 directions 6 h each ± 1 % R± (2 % + 0.05 ) R
Load Life 2000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF” ± 3 % R± (3 % + 0.05 ) R
Resistance to Soldering Heat + 260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± 1 % R± (0.5 % + 0.05 ) R
WSZ6720
POWER IN W
0
012345
100
200
300
WSZ7532
TEMPERATURE RISE IN °C
Measurement based on recommended solder pads
- 55 50 150 250 350
AMBIENT TEMPERATURE IN °C
0
20
WSZ7532
40
60
80
100
120
WSZ6720
RATED POWER IN %
PACKAGING
MODEL REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSZ6720 24 mm 330 mm 1250 BM
WSZ7532 (1) 32 mm/embossed plastic 330 mm/13" 350 EA/TA
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 02-Oct-12 1Document Number: 91000
Disclaimer
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including but not limited to the warranty expressed therein.
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Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as RoHS-Compliant fulfill the
definitions and restrictions defined under Directive 2011/65/EU of The European Parliament and of the Council
of June 8, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment
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Please note that some Vishay documentation may still make reference to RoHS Directive 2002/95/EC. We confirm that
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requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference
to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21
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