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)
68
1
6
Ø A max.
Ø 0.8
10 0.5
L max.
25 min.
25 min.
75
DIMENSIONS in millimeters (max.)
MODEL
Ø A
L
SG3
5 (5.2 for ≤ 0.2 Ω)
5.5 (5.8 for ≤ 0.5 Ω)
13
SG4
15.8
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Cement
Ni Cr wire
Copper tinned
SG3
SG4
to 3.9 kΩ
Ohmic Range
0.01
Ω
to 3.3 k
Ω
0.02
5 ꢀ
Ω
Standard Tolerance
Power Rating at + 40 °C
Limiting Element Voltage
Critical Resistance
3 W
100 V
3.3 k
4 W
125 V
3.9 k
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits
Climatic Category
- 55 °C + 250 °C
55/250/21
Ω
Ω
Temperature Coefficient (typical)
Temperature Coefficient (typical)
VΩ
< 0.1
Ω
Ω
300 ppm/°C
150 ppm/°C
VΩ ≥ 0.1
PERFORMANCE
TESTS
TYPICAL VALUES
AND DRIFTS
CONDITIONS
Short Time Overload
Rapid Change of Temperature
5 Pn during 5 s
(1.5 ꢀ + 0.005 Ω)
EN1400 CEI-115-1
- 55 °C + 200 °C 5 cycles
(1 ꢀ + 0.005 Ω)
EN60115-1
56 days 93 ꢀ RH
Humidity
(1 ꢀ + 0.005 Ω)
MIL-STD 202
Load Life
(5 ꢀ + 0.005 Ω)
(1 ꢀ + 0.005 Ω)
Method 108 Pr 1000h
Moisture Resistance
MIL-STD 202 Method 106
MIL-STD 202 Method 204
Test 20 g
Vibration
Shock
(0.5 ꢀ + 0.005 Ω)
(0.5 ꢀ + 0.005 Ω)
10 Hz/2000 Hz
MIL-STD 202 Method 213
Test C
Document Number: 50012
Revision: 23-Sep-09
For technical questions, contact: sfer@vishay.com
www.vishay.com
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