CHP_C.qxd 14/5/03 8:16 am Page 1
Metal Glaze General Purpose
Surface Mount Power Resistors
Welwyn Components
CHP Series
Up to 2 watts
0.1 ohm to 2.2 megohm range
Up to 1000 volts
150C maximum operating temperature
Electrical Data
Type Maximum Working Maximum Resistance Tolerance TCR Product
1 2 2 2
Power Rating Voltage Voltage Range (%) (ppm/C) Category
(watts) (volts) (volts) (ohms)
0R1 to 0R99 1, 2, 5 100 Low Range
CHP1/8 0.25 @ 70C 200 400 1R0 to 1M 1, 2, 5 50, 100 Standard
20R to 348K 0.25, 0.5 50, 100 Tight Tolerance
0R1 to 0R99 1, 2, 5 100 Low Range
CHP1/2 0.5 @ 70C 300 600
1R0 to 348K 1, 2, 5 50, 100 Standard
0R1 to 0R99 1, 2, 5 100 Low Range
CHP1 1 @ 70C 350 700 1R0 to 2M21 1, 2, 5 50, 100 Standard
20R to 348K 0.25, 0.5 50, 100 Tight Tolerance
2 @ 25C 0R1 to 0R99 1, 2, 5 100 Low Range
CHP2 500 1000
1.33 @ 70C 1R0 to 2M21 1, 2, 5 50, 100 Standard
1
Not to exceed PxR
2
Consult factory for tighter TCR, tolerance or resistance values
Performance Characteristics
Characteristics Maximum Change Test Method
Temperature As Specified MIL-R55342E Par 4.79 (-55C =125C)
Thermal Shock 0.5% +0.01 ohm MIL-R55342E Par 4.7.3 (-65C +150C, 5 cycles)
Low Temperature Operation 0.25% +0.01 ohm MIL-R-55342E Par 4.7.4 (-65C @ 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 (+150C for 100 hours)
Resistance to Bonding Exposure 0.25% 0.01 ohm MIL-R-55342E Par 4.7.7 (Reflow soldered to board at
260C for 10 seconds)
Solderability 95% minimum coverage MIL-STD-202, Method 208 (245C 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 70C 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
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyns own data and is considered accurate at time of going to print.
TT electronics plc
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 Issue C 05.03
43CHP_C.qxd 14/5/03 8:16 am Page 2
Metal Glaze General Purpose
Surface Mount Power Resistors
Welwyn Components
CHP Series
CHP Power Derating Curve CHP Repetitive Surge Curve
1000
120%
100%
CHP 1/8, 1/2, 1
100
80%
60% CHP 2
CHP 2
CHP 1
10
40%
CHP 1/2
CHP 1/8
20%
0% 1
30 50 70 90 110 130 150
0.0001 0.0010 0.0100 0.1000 1.0000
.1msec 1msec 10msec 100msec 10000msec
o
Ambient Temperature ( C)
Surge or pulse duration (seconds)
Note: Use for repetitive pulses where the average power
dissipation is not to exceed the component rating at 70C.
Surge handling capacity for low-repetitive surges may be
significantly greater than shown above. Contact factory for
recommendations.
Physical Data
Size Code Industry Dimensions (mm)
L
Footprint
L W C
C
CHP1/8 1206 3.250.18 1.450.15 0.510.25
CHP1/2 2010 5.080.25 2.010.15 0.7610.25
W
CHP1 2512 6.380.25 2.010.15 1.020.25
CHP2 3610 9.320.25 2.670.15 1.270.25
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 2%
D 0.5% J 5%
F 1%
Packing
CHP1/8 2500/reel
I Tape Standard
CHP1/2, CHP1, CHP2 1500/reel
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 Issue C 05.03
44
Percent Relative Power
Peak Power (watts)