VR68
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High Ohmic/High Voltage Metal Glaze Leaded Resistors
A metal glazed film is deposited on a high grade ceramic
body. After a helical groove has been cut in the resistive
layer, tinned electrolytic copper wires are welded to the
end-caps. The resistors are coated with a light blue lacquer
which provides electrical, mechanical, and climatic
protection.
The encapsulation is resistant to all cleaning solvents in
accordance with IEC 60068-2-45.
FEATURES
• Technology: Metal glaze
•Rmax. = 68 M; Umax. = 10 000 VDC
• These resistors meet the safety requirements of:
UL1676 (510 k to 11 M); File No: E171160
IEC 60065, clause 14.1.a)
DIN EN 60065, clause 14.1.a)
VDE 0860, clause 14.1.a)
CQC, China
• High pulse loading capability (10 kV)
• Small size (0718)
• Pure tin plating provides compatibility with lead (Pb)-free
and lead containing soldering processes
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• Where high resistance, high stability and high reliability at
high voltage are required
• Safety component in combination with high voltage
• Picture tubes
• High voltage bleeders
• Cascade switches
Note
(1) Ohmic values (other than resistance range) are available on request
TECHNICAL SPECIFICATIONS
DESCRIPTION UNIT VR68
Resistance Range (1) 100K to 68M
Resistance Tolerance % ± 1; ± 5
Resistance Series ± 1 %: E24/E96 series;
± 5 %: E24 series
Rated Dissipation, P70 W1
Thermal Resistance (Rth)K/W70
Temperature Coefficient ppm/K ± 200
Maximum Permissible Voltage Umax.:
DC V10 000
RMS 7000
Dielectric Withstanding Voltage of the Insulation for 1 Min V 700
Basic Specifications IEC 60115
Safety Requirements UL1676 (510 k to 11 M); DIN EN 60065, IEC 60065
clause 14.1.a); VDE 0860, clause 14.1.a), CQC
Climatic Category (IEC 60068-1) 55/155/56
Max. Resistance Change for Resistance Range, R max., after:
Load (1000 h, P70)± (1.5 % R + 0.1 )
Long Term Damp Heat Test (56 Days) ± (1.5 % R + 0.1 )
Soldering (10 s, 260 °C) ± (0.5 % R + 0.1 )
Noise μV/V max. 2.5
VR68
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Revision: 10-Jun-13 2Document Number: 28734
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Notes
• The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products
(1) Please refer to table PACKAGING
DIMENSIONS
MARKING
The nominal resistance and tolerance are marked on the
resistor using four or five colored bands in accordance with
IEC 60062, marking codes for resistors and capacitors.
Yellow and grey are used instead of gold and silver because
metal particles in the lacquer could affect high-voltage
properties.
PART NUMBER
PART NUMBER: VR68000001503JAC00
MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE PACKAGING (1) SPECIAL
VR68000 0 = Neutral
Z = Value overflow
(special)
0 = Standard 3 digit value
1 digit multiplier
MULTIPLIER
3 = *103
4 = *104
5 = *105
F = ± 1 %
J = ± 5 %
AC
RD
The 2 digits
are used for all
special parts.
00 = Standard
PRODUCT DESCRIPTION: VR68 5 % AC 150K
VR68 5 % AC 150K
MODEL/SIZE TOLERANCE PACKAGING (1) RESISTANCE VALUE
VR68 ± 1 %
± 5 %
AC
RD
150K = 150 k
8M2 = 8.2 M
PACKAGING
MODEL TAPING
AMMOPACK REEL
PIECES CODE PIECES CODE
VR68 Axial, 66 mm 500 AC 750 RD
DIMENSIONS - Resistor type and relevant physical dimensions
TYPE Ø Dmax. L1 max. L2 max. Ø d
VR68 6.8 18.0 19.0 0.78 ± 0.05
Outline
Ø D
L1
L2
Ø d
MASS PER UNIT
TYPE MASS
(mg)
VR68 1690
806RV00001503JAC00
VR68
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Revision: 10-Jun-13 3Document Number: 28734
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OUTLINES
The length of the body (L1) is measured by inserting the
leads into holes of two identical gauge plates and moving
these plates parallel to each other until the resistor body is
clamped without deformation (IEC 60294).
FUNCTIONAL PERFORMANCE
PRODUCT CHARACTERIZATION
Standard values of nominal resistance are taken from the
E96/E24/E12 series for resistors with a tolerance of ± 1 %,
or 5 %. The values of the E96/E24 series are in accordance
with IEC 60063.
Notes
• The maximum permissible hot-spot temperature is 155 °C
(1) The maximum voltage that may be continuously applied to the resistor element, see IEC 60115-1
DERATING
The power that the resistor can dissipate depends on the
operating temperature.
Maximum dissipation (Pmax.) in percentage of rated power as a
function of the ambient temperature (Tamb)
PULSE LOADING CAPABILITY
Maximum allowed peak pulse voltage in accordance with
IEC 60065, 14.1.a) ; 50 discharges from a 1 nF capacitor charged
to Ûmax.; 12 discharges/min (drift R/R 2 %)
LIMITING VALUES
TYPE
LIMITING VOLTAGE (1)
Umax. LIMITING POWER P70
(W)
DC RMS
VR68 10 000 7000 1.0
70 10050
00
50
100
155
- 55
T
amb (°C)
P
max.
(% rated)
P
4
6
8
10
10
2
20
10
- 2
101
R
n
(MΩ)
U
max.
(kV)
^
10
- 1
VR68
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Revision: 10-Jun-13 4Document Number: 28734
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APPLICATION INFORMATION
Hot-spot temperature rise (T) as a function of dissipated power Temperature rise (T) at the lead end (soldering point) as a function
of dissipated power at various lead lengths after mounting
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with
IEC 60115-1 specification, category LCT/UCT/56 (rated
temperature range: Lower Category Temperature, Upper
Category Temperature; damp heat, steady state, test
duration: 56 days).
The tests are carried out in accordance with IEC
60068-2-xx. Test method under standard atmospheric
conditions according to IEC 60068-1, 5.3.
In the Test Procedures and Requirements table the test
and requirements are listed with reference to the relevant
clauses of IEC 60115-1 and IEC 60068-2-xx test methods.
A short description of the test procedure is also given. In
some instances deviations from the IEC recommendations
were necessary for our method of specifying.
All soldering tests are performed with mildly activated flux.
0 0.4 1.2
00.8
20
40
60
80
P
(W)
∆
T
(K)
0 0.4 1.2
00.8
10
20
30
40
50
P
(W)
∆
T
(K) 10 mm
15 mm
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2-
TEST
METHOD
TEST PROCEDURE REQUIREMENTS
4.16 Robustness of terminations:
4.16.2 21 (Ua1) Tensile all samples Ø 0.8 mm; load 10 N; 10 s Number of failures < 10 x 10-6
4.16.3 21 (Ub) Bending half number
of samples Ø 0.8 mm; load 5 N; 4 x 90° Number of failures < 10 x 10-6
4.16.4 21 (Uc) Torsion other half
of samples 3 x 360° in opposite directions No damage
R max.: ± (0.5 % R + 0.05 )
4.17 20 (Ta) Solderability
2 s; 235 °C: Solder bath method; SnPb40
3 s; 245 °C: Solder bath method;
SnAg3Cu0.5
Good tinning ( 95 % covered);
no damage
Solderability
(after aging)
8 h steam or 16 h 155 °C;
leads immersed 6 mm;
for 2 s at 235 °C; solder bath (SnPb40)
for 3 s at 245 °C; solder bath
(SnAg3Cu0.5) method
Good tinning (95 % covered);
no damage
4.18 20 (Tb) Resistance to
soldering heat
Thermal shock: 10 s; 260 °C;
3 mm from body R max.: ± (0.5 % R + 0.05 )
4.19 14 (Na) Rapid change of temperature 30 min at - 55 °C and
30 min at + 155 °C; 5 cycles R max.: ± (0.5 % R + 0.05 )
VR68
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Revision: 10-Jun-13 5Document Number: 28734
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
12NC INFORMATION FOR HISTORICAL CODING REFERENCE
• The resistors have a 12-digit numeric code starting with
2322 244
• The subsequent:
First digit for 1 % tolerance products (E24 and E96 series)
or 2 digits for 5 % (E24 series) indicate the resistor type
and packing.
• The remaining digits indicate the resistance value:
- The first 3 digits for 1 % or 2 digits for 5 % tolerance
products indicate the resistance value.
- The last digit indicates the resistance decade.
Last Digit of 12NC Indicating Resistance Decade
12NC Example
The 12NC for a VR68, resistor value 7.5 M, 5 % tolerance,
supplied on a bandolier of 500 units in ammopack, is:
2322 244 13755.
4.20 29 (Eb) Bump 3 x 1500 bumps in 3 directions; 40 gNo damage
R max.: ± (0.5 % R + 0.05 )
4.22 6 (Fc) Vibration
Frequency 10 Hz to 500 Hz; displacement
1.5 mm or acceleration 10 g; 3 directions;
total 6 h (3 x 2 h)
No damage
R max.: ± (0.5 % R + 0.05 )
4.23 Climatic sequence:
Rins min.: 103 M
R max.: ± (1.5 % R + 0.1 )
4.23.2 2 (Ba) Dry heat 16 h; 155 °C
4.23.3 30 (Db) Damp heat (accelerated)
1st cycle 24 h; 55 °C; 90 % to 100 % RH
4.23.4 1 (Aa) Cold 2 h; - 55 °C
4.23.5 13 (M) Low air pressure 2 h; 8.5 kPa; 15 °C to 35 °C
4.24 78 (Cab) Damp heat
(steady state)
56 days; 40 °C; 90 % to 95 % RH;
dissipation 0.01 P70;
limiting voltage U = 100 VDC
R max.: ± (1.5 % R + 0.1 )
4.25.1 Endurance 1000 h at 70 °C; P70 or Umax. R max.: ± (1.5 % R + 0.1 )
4.8 Temperature coefficient Between - 55 °C and + 155 °C ± 200 ppm/K
4.7 Voltage proof on insulation URMS = 700 V during 1 min;
V-block method No breakdown
4.12 Noise IEC 60195 Max. 2.5 μV/V
4.6.1.1 Insulation resistance U = 500 VDC during 1 min;
V-block method Rins min.: 104 M
4.13 Short time overload
Room temperature;
dissipation 6.25 x P70 (voltage not more
than 2 x limiting voltage; 10 000 V max.);
10 cycles; 5 s ON and 45 s OFF
R max.: ± (2.0 % R + 0.05 )
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2-
TEST
METHOD
TEST PROCEDURE REQUIREMENTS
RESISTANCE DECADE LAST DIGIT
100 k to 976 k4
1 M to 9.76 M5
10 M6
12NC - Resistor type and packaging
TYPE TAPE WIDTH
(mm)
TOL.
(%)
2322 244 .....
BANDOLIER IN AMMOPACK BANDOLIER ON REEL
500 UNITS 750 UNITS
VR68 66.7 ± 1 8.... 6....
± 5 13... 23...
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