Characteristics Maximum Change Test Method
Temperature As Specified MIL-R55342E Par 4.79 (-55°C =125°C)
Thermal Shock ±0.5% +0.01 ohm MIL-R55342E Par 4.7.3 (-65°C +150°C, 5 cycles)
Low Temperature Operation ±0.25% +0.01 ohm MIL-R-55342E Par 4.7.4 (-65°C @ working voltage)
Short Time Overload ±0.5% +0.01 ohm MIL-R-55342E Par 4.7.5
+1% for R>100K ohm 2.5 x √PxR for 5 seconds
High Temperature Exposure ±0.5% +0.01 ohm MIL-R-55342E Par 4.7.6 (+150°C for 100 hours)
Resistance to Bonding Exposure ±0.25% 0.01 ohm MIL-R-55342E Par 4.7.7 (Reflow soldered to board at
260°C for 10 seconds)
Solderability 95% minimum coverage MIL-STD-202, Method 208 (245°C for 5 seconds)
Moisture Resistance ±0.5% +0.01 ohm MIL-R-55342E Par 4.7.8 (10 cycles, total 240 hours)
Life Test ±0.5% +0.01 ohm MIL-R-55342E Par 4.7.10 (2000 hour at 70°C intermittent)
Terminal Adhesion Strength ±1% +0.01 ohm 1200 gram push from underside of mounted chip
no mechanical change for 60 seconds
Resistance to Board Bending ±1% +0.01 ohm Chip mounted in center of 90mm long board, deflected
5mm so as to exert pull on chip for 10 seconds
Type Maximum Working Maximum Resistance Tolerance TCR Product
Power Rating Voltage1Voltage Range2(±%)2(ppm/°C)2Category
(watts) (volts) (volts) (ohms)
0R1 to 0R99 1, 2, 5 100 Low Range
CHP1/8 0.25 @ 70°C 200 400 1R0 to 1M 1, 2, 5 50, 100 Standard
20R to 348K 0.25, 0.5 50, 100 Tight Tolerance
CHP1/2 0.5 @ 70°C 300 600
0R1 to 0R99 1, 2, 5 100 Low Range
1R0 to 348K 1, 2, 5 50, 100 Standard
0R1 to 0R99 1, 2, 5 100 Low Range
CHP1 1 @ 70°C 350 700 1R0 to 2M21 1, 2, 5 50, 100 Standard
20R to 348K 0.25, 0.5 50, 100 Tight Tolerance
2 @ 25°C 0R1 to 0R99 1, 2, 5 100 Low Range
CHP2 1.33 @ 70°C 500 1000 1R0 to 2M21 1, 2, 5 50, 100 Standard
Metal Glaze™General Purpose
Surface Mount Power Resistors
CHP Series
•Up to 2 watts
•0.1 ohm to 2.2 megohm range
•Up to 1000 volts
•150°C maximum operating temperature
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
Issue C · 05.03
A subsidiary of
TT electronics plc
Welwyn Components
43
Performance Characteristics
1Not to exceed √PxR
2Consult factory for tighter TCR, tolerance or resistance values
CHP_C.qxd 14/5/03 8:16 am Page 1
Metal Glaze™General Purpose
Surface Mount Power Resistors
CHP 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
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Issue C · 05.03
Welwyn Components
44
120%
100%
80%
60%
40%
20%
0%
30 50 70 90 110 130 150
Ambient Temperature (oC)
Percent Relative Power
CHP 1/8, 1/2, 1
CHP 2
1000
100
10
1
0.0001 0.0010 0.0100 0.1000 1.0000
.1msec 1msec 10msec 100msec 10000msec
Surge or pulse duration (seconds)
Peak Power (watts)
CHP 2
CHP 1
CHP 1/8
CHP 1/2
Note: Use for repetitive pulses where the average power
dissipation is not to exceed the component rating at 70°C.
Surge handling capacity for low-repetitive surges may be
significantly greater than shown above. Contact factory for
recommendations.
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Footprint L W C
CHP1/8 1206 3.25±0.18 1.45±0.15 0.51±0.25
CHP1/2 2010 5.08±0.25 2.01±0.15 0.761±0.25
CHP1 2512 6.38±0.25 2.01±0.15 1.02±0.25
CHP2 3610 9.32±0.25 2.67±0.15 1.27±0.25
Physical Data
L
C
W
CHP_C.qxd 14/5/03 8:16 am Page 2
Ordering Procedure
Example: CHP1 at 100 ohms, 1% tolerance and 100ppm/ °C on a reel of 1500 pieces -
C H P 1 – 1 0 0 R F I
Type
Size
TCR
100ppm/ °C
- 50
50ppm/ °C
Value (use IEC62 code)
Tolerance (use IEC62 code)
C
0.25%
G
D
0.5%
J
F
1%
Packing
I
Tape
CHP1/8
2500/reel
Standard
CHP1/2, CHP1, CHP2
1500/reel