High Voltage
Chip Resistors
HVC Series
Welwyn Components
Application Notes
HVC resistors are ideally suited for handling by automatic
methods due to their rectangular shape and the small
dimensional tolerances. Electrical connection to a ceramic
substrate or to a printed circuit board can be made by reflow
or wave soldering of wrap-around terminations.
Wrap-around terminations provide good leach properties and
ensure reliable contact. Due to the robust construction, the
HVC can be immersed in the solder bath for 30 seconds at
260°C. This enables the resistor to be mounted on one side
of a printed circuit board and wire-leaded components
applied on the other side.
HVC resistors themselves can operate at a maximum
temperature of 155°C (see performance above). For soldered
resistors, the joint temperature should not exceed 110°C. This
condition is met when the stated power levels at 70°C are used.
The PCB layout should avoid tracks running between the HVC
mounting pads, as this would compromise the LEV.
The LEV stated applies to operation at sea-level pressure, in a
non-condensing atmosphere and non-contaminating
environment. Voltage derating should be applied if low
pressure, high humidity or contamination may be encountered.
The termination clearance dimension (B) should be used in
conjunction with the creepage limit applicable to the circuit
application in order to determine the derated LEV.
Packaging
HVC Resistors are supplied taped and reeled as per IEC 286-3.
T
2
D
0
P
2
P
0
T
Marking
(Both sides)
33
±
1.0
Wr
E
13
±
0.5
F
178
±
2
80
±
2
B
0
2.5
±
0.5
0.8
±
0.15
T
1
K
0
A
0
P
1
D
1
Tape and reel dimensions (mm)
Wr
±0.5
1206
2010
2512
9
13
13
W
±0.3
8
12
12
P1
±0.1
4
8
8
P0
±0.1
4
4
4
P2
±0.05
2
2
2
D0
±0.1
1.5
1.5
1.5
D1
±0.2
1
1.5
1.5
E
±0.1
1.75
1.75
1.75
F
±0.05
3.5
5.5
5.5
A0
±0.1
1.95
2.79
3.61
B0
±0.1
3.55
5.89
6.96
K0
±0.1
1.0
0.91
1.17
T
±0.05
0.2
0.28
0.28
T1
Nom.
0.05
0.06
0.06
T2
±0.15
1.3
1.21
1.45
G
W
Qty.
per
reel
3000
3000
1800
Ordering Procedure
Example: HVC2512 at 4.7 megohms and 1% tolerance on a reel of 1800 pieces -
Type
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
D
F
G
0.5%
1%
2%
J
K
5%
10%
T3
T18
Tape
1206 or 2010
2512
3000/reel
1800/reel
HVC
2512
-
4M7
F
T18
Packing
Standard
© 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
86
Issue D · 11.05
WELWYN [ WELWYN COMPONENTS LIMITED ]
