VR25
Vishay BCcomponents
High Ohmic/High Voltage Resistors
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”.
TECHNICAL SPECIFICATIONS
DESCRIPTION
Resistance range
1)
Resistance tolerance and series:
100 kΩ to 15 MΩ
15 MΩ to 22 MΩ
Maximum dissipation at T
amb
= 70
°C
Thermal resistance, R
th
Temperature coefficient
Maximum permissible voltage:
DC
RMS
Dielectric withstanding voltage of the insulation for 1 minute
Basic specifications
Climatic category (IEC 60068)
Stability after:
load (1000 hours)
accelerated damp heat test (6 days)
long term damp heat test (56 days)
Noise
Note
1. Ohmic values (other than resistance range) are available on request.
VALUE
100 kΩ to 22 MΩ
± 1 %: E24/E96 series; ± 5 %: E24 series
± 5 %: E24 series; ± 10 %: E12 series
0.25 W
140 K/W
≤
± 200
×
10
-6
/K
1600 V
1150 V
700 V
IEC 60115-1B
55/155/56
∆R/R
max.: ± 1.5 % + 0.1
Ω
∆R/R
max.: ± 1.5 % + 0.1
Ω
∆R/R
max.: ± 1.5 % + 0.1
Ω
max. 5 µV/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.
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168
Last Digit of 12NC Indicating Resistance Decade
RESISTANCE DECADE
100 to 976 kΩ
1 to 9.76 MΩ
≥
10 MΩ
LAST DIGIT
4
5
6
12NC Example
The 12NC for a VR25, resistor value 7.5 MΩ, 5 % tolerance,
supplied on a bandolier of 1000 units in ammopack, is:
2322 241 13755.
Document Number: 28732
Revision: 06-Dec-05
For technical questions contact: ff3dresistors@vishay.com
VR25
High Ohmic/High Voltage Resistors
Vishay BCcomponents
12NC
- resistor type and packing
ORDERING CODE 2322 241 .....
BANDOLIER IN AMMOPACK
TYPE
TOL.
(%)
RADIAL TAPED
4000
units
±1
VR25
±5
± 10
0....
36...
-
52 mm
1000
units
8....
13...
12...
STRAIGHT LEADS
26 mm
2000
units
-
43...
42...
52 mm
5000
units
7....
53...
52...
52 mm
5000
units
6....
23...
22...
BANDOLIER
ON REEL
PART NUMBER
PART NUMBER: VR25000001503JA100
V
MODEL/SIZE
VR25000
R
2
5
0
0
0
0
0
1
5
0
3
J
A
1
0
0
SPECIAL
The 2 digits
are used for
all special
parts.
00
= standard
SPECIAL CHARACTER
0
= neutral
Z
= value overflow
(Special)
TC/MATERIAL
0
= standard
VALUE
3 digit value
1 digit multiplier
Multiplier:
3
= *10
3
4
= *10
4
5
= *10
5
TOLERANCE
F
=±1%
J
=±5%
K
= ± 10 %
PACKING
1)
A5
A2
A1
R5
N4
PRODUCT DESCRIPTION: VR25 5 % A1 150K
VR25
MODEL/SIZE
VR25
5%
TOLERANCE
±
1
%
±
5
%
±
10
%
A1
PACKING
1)
A1
A5
150K
RESISTANCE VALUE
47K
= 47 KΩ
50R1
= 50.1
Ω
1)
Please refer to table PACKING.
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.
PACKING
CODE
A5
A2
A1
R5
N4
PIECES
5000
2000
1000
5000
4000
DESCRIPTION
Bandolier in ammopack straight leads 52 mm
Bandolier in ammopack straight leads 26 mm
Bandolier in ammopack straight leads 52 mm
Bandolier on reel straight leads 52 mm
Bandolier in ammopack radial taped
VR25
MODEL/SIZE
Document Number: 28732
Revision: 06-Dec-05
For technical questions contact: ff3dresistors@vishay.com
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169
VR25
Vishay BCcomponents
DIMENSIONS
L
1
High Ohmic/High Voltage Resistors
∅
d
∅
D
L
2
Outline
DIMENSIONS
- resistor type and relevant physical dimensions
TYPE
VR25
∅
D
MAX.
2.5
L
1
MAX.
6.5
L
2
MAX.
7.5
∅
d
0.58 ± 0.05
MASS PER 100 UNITS
TYPE
VR25 52 mm
VR25 26 mm
MASS
(g)
21.2
14.8
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”).
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”.
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”.
LIMITING VALUES
TYPE
DC
VR25
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.
1600
LIMITING VOLTAGE
1)
(V)
RMS
1150
LIMITING POWER
(W)
0.25
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For technical questions contact: ff3dresistors@vishay.com
Document Number: 28732
Revision: 06-Dec-05
VR25
High Ohmic/High Voltage Resistors
Vishay BCcomponents
The power that the resistor can dissipate depends on the operating
temperature.
P
max
(%P
rated
)
100
^
20
V
max
(kV)
10
8
50
6
0
- 55
0
50
70
100
155
T
amb
(°C)
4
10
-2
10
-1
1
10
10
2
R
n
(MΩ)
Maximum dissipation (P
max
) in percentage of rated power
as a function of the ambient temperature (T
amb
)
Maximum allowed peak pulse voltage in accordance with
“IEC 60065 chapter 14.1”;
50 discharges from a 1 nF capacitor
charged to V
max
; 12 discharges/minute (drift
∆R/R ≤
2 %)
Derating
Pulse Loading Capability
100
∆T
(K)
80
50
∆T
(K)
40
5 mm
10 mm
15 mm
60
30
40
20
20
10
0
0
0
0.1
0.2
P (W)
0.3
0
0.1
0.2
P (W)
0.3
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
Application Information
Document Number: 28732
Revision: 06-Dec-05
For technical questions contact: ff3dresistors@vishay.com
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171
VR25
Vishay BCcomponents
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.
High Ohmic/High Voltage Resistors
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
4.16
IEC
60068-2
TEST
METHOD
21 (U)
TEST
PROCEDURE
REQUIREMENTS
robustness of terminations:
∅
0.6 mm; load 10 N; 10 s
∅
0.6 mm; load 5 N; 4
×
90°
3
×
360° in opposite directions
2 s; 235
°C
thermal shock: 3 s; 350
°C;
3 mm from body
30 minutes at - 55
°C
and
30 minutes at + 155
°C;
5 cycles
3
×
1500 bumps in 3 directions; 40 g
∆R/R
max.: ± 0.5 % + 0.05
Ω
number of failures
<
10
×
10
-6
number of failures
<
10
×
10
-6
4.16.2
21 (Ua1)
tensile all samples
4.16.3
21 (Ub)
bending half number
of samples
4.16.4
21 (Uc)
torsion other half
of samples
no damage
∆R/R
max.: ± 0.5 % + 0.05
Ω
good tinning; no damage
∆R/R
max.: ± 0.5 % + 0.05
Ω
4.17
20 (Ta)
solderability
4.18
20 (Tb)
resistance to
soldering heat
4.19
14 (Na)
rapid change of temperature
4.20
29 (Eb)
bump
no damage
∆R/R
max.: ± 0.5 % + 0.05
Ω
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
Ω
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For technical questions contact: ff3dresistors@vishay.com
Document Number: 28732
Revision: 06-Dec-05
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