High Voltage
Chip Resistors
HVC Series
Welwyn Components
•
•
•
•
Continuous voltages up to 3kV
Values up to 100M
Tolerances to ±0.5%
Robust thick film construction
Electrical Data
1206
Power rating @70°C
Limiting element voltage
Resistance range
Resistance tolerance
TCR
Ambient temperature range
Values
Thermal Impedance
°C/W
200
watts
volts
ohms
%
ppm/°C
°C
0.3
1000
2010
0.5
2000
100K to 100M
0.5, 1, 2, 5, 10
100
-55 to +155
E24 & E96 preferred
80
70
Any value to order
2512
1
3000
DC or AC peak
Consult factory for
out of range values
See table of
value ranges
Notes
Value Ranges (ohms)
Tolerance %
Size
1206
2010
2512
10
100K to 100M
100K to 100M
100K to 100M
5
100K to 100M
100K to 100M
100K to 100M
2
100K to 10M
100K to 10M
100K to 10M
1
100K to 2M
100K to 10M
100K to 10M
0.5
N/A
N/A
100K to 10M
Physical Data
Dimensions (mm) & Weight (g)
L
1206
2010
2512
3.2±0.2
5.1±0.2
6.5±0.2
W
1.6±0.2
2.5±0.2
3.2±0.2
T nom
0.6
0.7
0.7
A
0.35±0.2
0.45±0.2
0.45±0.2
B*
1.95 min
C
0.35±0.2
Wt.
0.010
T
3.70 min 0.45±0.25
5.00 min
0.4±0.2
0.035
0.055
A
B
L
A
W
Wrap-around terminations
(3 faces)
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.
A subsidiary of
TT electronics plc
Issue C · 10.03
© 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
84
High Voltage
Chip Resistors
HVC Series
Construction
Resistive thick film material, overglaze and organic protection
are screen printed on a 96% alumina substrate. The design
and laser adjustment of the resistive element optimises the
limiting element voltage of the resistor.
Welwyn Components
Solderability
The terminations have an electroplated nickel barrier and
tin-lead solder coating, and this ensures excellent ‘leach’
resistance properties and solderability.
Marking
Terminations
The chips are supplied with wrap-around terminations suitable
for soldering. Consult factory for alternative termination
options.
The body protection is resistant to all normal cleaning solvents
suitable for printed circuits.
The chips are not marked and the relevant information type,
value, tolerance date code and quantity are recorded on the reel.
Performance Data
Maximum
Load at rated power: 1000 hours at 70°C
Shelf life test: 12 months at room temperature
Derating from rated power at 70°C
Short term overload:
Lesser of 6.25 x rated power or 1.5 x LEV for 2S
Dry heat: 1000 hours at 155°C
Long term damp heat
Temperature rapid change
Resistance to solder heat
Voltage proof
Voltage coefficient of resistance
∆R%
∆R%
∆R%
∆R%
∆R%
Volts
ppm/V
1206:
-25
2010:
-15
2512:
-5
0.5
0.5
0.5
0.25
0.25
500
1206:
-15
2010:
-5
2512:
-1.5
∆R%
∆R%
0.5
0.1
Zero at 155°C
0.1
0.2
0.25
0.05
0.05
Typical
0.25
0.02
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 and
in a non-condensing atmosphere. Voltage derating should be
applied if low pressure or high humidity 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.
© 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 · 10.03
85
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