Document Number: 50012 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 23-Sep-09 109
SG3, SG4
Vishay Sfernice
Cemented Wirewound Resistors
FEATURES
•3 W and 4 W at + 40 °C
•Cemented protection
•Non flammability
•Industrial applications
•Compliant to RoHS directive 2002/95/EC
•Low values available: 10 mΩ available (for SG3)
100 mΩ available (for SG4)
MECHANICAL SPECIFICATIONS
Mechanical Protection Cement
Resistive Element Ni Cr wire
Connections Copper tinned
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits - 55 °C + 250 °C
Climatic Category 55/250/21
25 min.
Ø A max. Ø 0.8
L max. 25 min.
10 ± 0.5
68 ± 1
75
6
DIMENSIONS in millimeters (max.)
MODEL Ø A L
SG3 5 (5.2 for ≤ 0.2 Ω)13
SG4 5.5 (5.8 for ≤ 0.5 Ω) 15.8
ELECTRICAL SPECIFICATIONS
SG3 SG4
Ohmic Range
0.01
Ω
to 3.3 k
Ω
0.02
Ω
to 3.9 k
Ω
Standard Tolerance
± 5 %
Power Rating at + 40 °C
3 W 4 W
Limiting Element Voltage
100 V 125 V
Critical Resistance
3.3 k
Ω
3.9 k
Ω
Temperature Coefficient (typical)
V
Ω
< 0.1
Ω
300 ppm/°C
Temperature Coefficient (typical)
V
Ω
≥
0.1
Ω
150 ppm/°C
PERFORMANCE
TESTS CONDITIONS TYPICAL VALUES
AND DRIFTS
Short Time Overload 5 Pn during 5 s ± (1.5 % + 0.005 Ω)
Rapid Change of Temperature EN1400 CEI-115-1
- 55 °C + 200 °C 5 cycles ± (1 % + 0.005 Ω)
Humidity EN60115-1
56 days 93 % RH ± (1 % + 0.005 Ω)
Load Life MIL-STD 202
Method 108 Pr 1000h ± (5 % + 0.005 Ω)
Moisture Resistance MIL-STD 202 Method 106 ± (1 % + 0.005 Ω)
Vibration
MIL-STD 202 Method 204
Test 20 g
10 Hz/2000 Hz
± (0.5 % + 0.005 Ω)
Shock MIL-STD 202 Method 213
Test C ± (0.5 % + 0.005 Ω)
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50012
110 Revision: 23-Sep-09
SG3, SG4
Vishay Sfernice Cemented Wirewound Resistors
SPECIAL FEATURES
Please consult Vishay Sfernice for other ohmic values and tolerances.
MARKING
GEKA trademark, model, style, nominal resistance (in Ω), tolerance (in %).
Note: For low ohmic values, (< 0.1 Ω), quality of marking cannot be guaranteed.
PACK AGING
Tape and reel packaging by:
- 1500 pieces SG3
- 1250 pieces SG4
ORDERING INFORMATION
SG 3 330 Ω± 5 % ± 150 ppm/°C TR1500 e3
MODEL STYLE
3
4
OHMIC VALUE TOLERANCE TEMPERATURE
COEFFICIENT
± 300 ppm/°C
PACKAGING LEAD (Pb)-FREE
GLOBAL PART NUMBER INFORMATION
GLOBAL
MODEL SIZE OHMIC VALUE TOLERANCE PACKAGING SPECIAL
SG 3
4
The first four digits are
significant figures and
the last digit specifies
the number of zeros to
follow. R designates
decimal point.
R0300 = 0.03 mΩ
2R870 = 2.87 Ω
1R200 = 1.2 Ω
10020 = 10 000 Ω
R3300 = 0.33 Ω
J = 5.0 % R17 = reel
1250 pieces
R18 = reel
1500 pieces
As applicable.
Example: AD7
TEMPERATURE RISE POWER RATING CHART
AMBIENT TEMPERATURE IN °C
R E W O P D E
T
A R %
100
80
60
40
20
0 0 40 80 120 160 200 240 260
RATED POWER IN W
C ° N I E R U T A R E P M E T T O P S T O H
300
240
180
120
60
0
0 1 2 3 4 5 6 7
3 G S
4 G
S
0300JR1G 3S 8R
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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