High Ohmic/High Voltage Resistors
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Document Number: 28732
168
Revision: 06-Dec-05
VR25
Vishay BCcomponents
FEATURES
High pulse loading capability
Small size
Lead (Pb)-free solder contacts
Pure tin plating provides compatibility with lead (Pb)-free
and lead containing soldering processes
Compatible with "Restriction of the use of Hazardous
Substances" (RoHS) directive 2002/95/EC (issue 2004)
APPLICATIONS
Where high resistance, high stability and high reliability at
high voltage are required
High humidity environment
White goods
Power supplies
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 "MIL-STD 202E, method 215" and
"IEC 60068-2-45".
Note
1. Ohmic values (other than resistance range) are available on request.
TECHNICAL SPECIFICATIONS
DESCRIPTION
VALUE
Resistance range
1)
100 k
to 22 M
Resistance tolerance and series:
100 k
to 15 M
1 %: E24/E96 series; 5 %: E24 series
15 M
to 22 M
5 %: E24 series; 10 %: E12 series
Maximum dissipation at T
amb
= 70
C
0.25 W
Thermal resistance, R
th
140 K/W
Temperature coefficient
200 10
-6
/K
Maximum permissible voltage:
DC
1600 V
RMS
1150 V
Dielectric withstanding voltage of the insulation for 1 minute
700 V
Basic specifications
IEC 60115-1B
Climatic category (IEC 60068)
55/155/56
Stability after:
load (1000 hours)
R/R max.: 1.5 % + 0.1
accelerated damp heat test (6 days)
R/R max.: 1.5 % + 0.1
long term damp heat test (56 days)
R/R max.: 1.5 % + 0.1
Noise
max. 5 V/V
12NC INFORMATION
The resistors have a 12-digit numeric code starting with
2322 241
The subsequent:
first digit for 1 % tolerance products (E24 and E96 series)
or 2 digits for 5 % (E24 series) and 10 % (E12 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 and 10 %
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 VR25, resistor value 7.5 M
, 5 % tolerance,
supplied on a bandolier of 1000 units in ammopack, is:
2322 241 13755.
RESISTANCE DECADE
LAST DIGIT
100 to 976 k
4
1 to 9.76 M
5
10 M
6
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Revision: 06-Dec-05
169
VR25
High Ohmic/High Voltage Resistors
Vishay BCcomponents
12NC - resistor type and packing
TYPE
TOL.
(%)
ORDERING CODE 2322 241 .....
BANDOLIER IN AMMOPACK
BANDOLIER
ON REEL
RADIAL TAPED
STRAIGHT LEADS
4000
units
52 mm
26 mm
52 mm
52 mm
1000
units
2000
units
5000
units
5000
units
VR25
1
0....
8....
-
7....
6....
5
36...
13...
43...
53...
23...
10
-
12...
42...
52...
22...
Note
Products can be ordererd using either the 12NC or the PART NUMBER. The PART NUMBER is shown to facilitate the introduction of a unified
part numbering system. Currently, this PART NUMBER is applicable in the Americas only.
PART NUMBER
PART NUMBER: VR25000001503JA100
MODEL/SIZE
SPECIAL CHARACTER
TC/MATERIAL
VALUE
TOLERANCE
PACKING
1)
SPECIAL
VR25000
0 = neutral
Z = value overflow
(Special)
0 = standard
3 digit value
1 digit multiplier
Multiplier:
3 = *10
3
4 = *10
4
5 = *10
5
F = 1 %
J = 5 %
K = 10 %
A5
A2
A1
R5
N4
The 2 digits
are used for
all special
parts.
00 = standard
PRODUCT DESCRIPTION: VR25 5 % A1 150K
VR25
5 %
A1
150K
MODEL/SIZE
TOLERANCE
PACKING
1)
RESISTANCE VALUE
VR25
1 %
5 %
10 %
A1
A5
47K = 47 K
50R1 = 50.1
1)
Please refer to table PACKING.
PACKING
CODE
PIECES
DESCRIPTION
MODEL/SIZE
A5
5000
Bandolier in ammopack straight leads 52 mm
VR25
A2
2000
Bandolier in ammopack straight leads 26 mm
A1
1000
Bandolier in ammopack straight leads 52 mm
R5
5000
Bandolier on reel straight leads 52 mm
N4
4000
Bandolier in ammopack radial taped
5
0
2
R
V
0
0
0
0
1
5
0
3
J
A
1
0
0
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Document Number: 28732
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VR25
Vishay BCcomponents
High Ohmic/High Voltage Resistors
DIMENSIONS
MARKING
The nominal resistance and tolerance are marked on the
resistor using four or five colored bands in accordance with
IEC publication 60062 "Color codes for fixed resistors".
Yellow and grey are used instead of gold and silver because
metal particles in the lacquer could affect high-voltage
properties.
OUTLINES
The length of the body (L
1
) 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 publication 60294").
D
L
1
L
2
d
Outline
DIMENSIONS - resistor type and relevant physical dimensions
TYPE
D
MAX.
L
1
MAX.
L
2
MAX.
d
VR25
2.5
6.5
7.5
0.58 0.05
MASS PER 100 UNITS
TYPE
MASS
(g)
VR25 52 mm
21.2
VR25 26 mm
14.8
FUNCTIONAL PERFORMANCE
PRODUCT CHARACTERIZATION
Standard values of nominal resistance are taken from the E96/E24/E12 series for resistors with a tolerance of
1 %, 5 % or
10 %. The values of the E96/E24/E12 series are in accordance with "IEC publication 60063".
Note
1. The maximum voltage that may be continuously applied to the resistor element, see "IEC publication 60115-1".
The maximum permissible hot-spot temperature is 155
C.
LIMITING VALUES
TYPE
LIMITING VOLTAGE
1)
(V)
LIMITING POWER
(W)
DC
RMS
VR25
1600
1150
0.25
Document Number: 28732
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VR25
High Ohmic/High Voltage Resistors
Vishay BCcomponents
Derating
Pulse Loading Capability
70
100
50
0
0
50
100
155
- 55
T
amb
(
C)
P
max
(%P
rated
)
Maximum dissipation (P
max
) in percentage of rated power
as a function of the ambient temperature (T
amb
)
The power that the resistor can dissipate depends on the operating
temperature.
4
6
8
10
10
2
20
10
-2
10
1
R
n
(M
)
V
max
(kV)
^
10
-1
Maximum allowed peak pulse voltage in accordance with
"IEC 60065 chapter 14.1"; 50 discharges from a 1 nF capacitor
charged to
; 12 discharges/minute (drift
R/R 2 %)
V
max
Application Information
100
0
0.1
0.3
0
0.2
20
40
60
80
P (W)
T
(K)
Hot-spot temperature rise (
T) as a function of dissipated power
50
0
0.1
0.3
0
0.2
10
20
30
40
P (W)
T
(K)
5 mm
10 mm
15 mm
Temperature rise (
T) at the lead end (soldering point) as a function
of dissipated power at various lead lengths after mounting
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Document Number: 28732
172
Revision: 06-Dec-05
VR25
Vishay BCcomponents
High Ohmic/High Voltage Resistors
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with the
schedule of "IEC publication 60115-1", category
LCT/UCT/56 (rated temperature range: Lower Category
Temperature, Upper Category Temperature; damp heat,
long term, 56 days). The testing also covers the
requirements specified by EIA and EIAJ.
The tests are carried out in accordance with IEC publication
60068-2, "Recommended basic climatic and mechanical
robustness testing procedure for electronic components" and
under standard atmospheric conditions according to
"IEC 60068-1", subclause 5.3.
In the Test Procedures and Requirements table the tests and
requirements are listed with reference to the relevant clauses
of "IEC publications 60115-1 and 60068-2"; 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.
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST
PROCEDURE
REQUIREMENTS
4.16
21 (U)
robustness of terminations:
4.16.2
21 (Ua1)
tensile all samples
0.6 mm; load 10 N; 10 s
number of failures
< 10 10
-6
4.16.3
21 (Ub)
bending half number
of samples
0.6 mm; load 5 N; 4 90
number of failures
< 10 10
-6
4.16.4
21 (Uc)
torsion other half
of samples
3
360 in opposite directions
no damage
R/R max.: 0.5 % + 0.05
4.17
20 (Ta)
solderability
2 s; 235
C
good tinning; no damage
4.18
20 (Tb)
resistance to
soldering heat
thermal shock: 3 s; 350
C;
3 mm from body
R/R max.: 0.5 % + 0.05
4.19
14 (Na)
rapid change of temperature
30 minutes at - 55
C and
30 minutes at + 155
C; 5 cycles
R/R max.: 0.5 % + 0.05
4.20
29 (Eb)
bump
3
1500 bumps in 3 directions; 40 g
no damage
R/R max.: 0.5 % + 0.05
4.22
6 (Fc)
vibration
frequency 10 to 500 Hz; displacement
1.5 mm or acceleration 10 g; 3 directions;
total 6 hours (3
2 hours)
no damage
R/R max.: 0.5 % + 0.05
Document Number: 28732
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Revision: 06-Dec-05
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VR25
High Ohmic/High Voltage Resistors
Vishay BCcomponents
4.23
climatic sequence:
4.23.2
2 (Ba)
dry heat
16 hours; 155
C
4.23.3
30 (Db)
damp heat (accelerated) 1
st
cycle
24 hours; 55
C; 90 to 100 % RH
4.23.4
1 (Aa)
cold
2 hours; - 55
C
4.23.5
13 (M)
low air pressure
2 hours; 8.5 kPa; 15 to 35
C
4.23.6
30 (Db)
damp heat (accelerated)
remaining cycles
5 days; 55
C; 95 to 100 % RH
R
ins
min.: 10
3
M
R/R max.: 1.5 % + 0.1
4.24.2
3 (Ca)
damp heat
(steady state)
56 days; 40
C; 90 to 95 % RH;
dissipation 0.01 P
n
;
limiting voltage 100 V (DC)
R/R max.: 1.5 % + 0.1
4.25.1
endurance
1000 hours at 70
C; P
n
or V
max
R/R max.: 1.5 % + 0.1
4.8.4
temperature coefficient
between - 55
C and + 155 C
(TC
10
-6
/K)
200
4.7
voltage proof on insulation
700 V (RMS) during 1 minute; V-block
method
no breakdown
4.12
noise
"IEC publication 60195"
max. 5 V/V
4.6.1.1
insulation resistance
500 V (DC) during 1 minute; V-block
method
R
ins
min.: 10
4
M
4.13
short time overload
room temperature;
dissipation 6.25
P
n
(voltage not more
than 2
limiting voltage); 10 cycles;
5 s on and 45 s off
R/R max.: 2.0 % + 0.05
4.26
active flammability
"Cheese-cloth test"
steps of: 5/10/16/25/40
P
n
(RMS)
duration 5 minutes
no flaming of gauze cylinder
OTHER TEST IN ACCORDANCE WITH IEC 60695
2.2
passive flammability
"Needle-flame test"
application of test flame for 20 s
no ignition of product;
no ignition of under-layer;
burning time less than 30 s
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST
PROCEDURE
REQUIREMENTS
Legal Disclaimer Notice
Vishay
Document Number: 91000
www.vishay.com
Revision: 08-Apr-05
1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
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