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154 Revision: 19-Oct-09
SR37
Vishay BCcomponents
Surge Metal Film Leaded Resistor
A multi layer metal 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
non-flammable lacquer, which provides electrical,
mechanical, and climatic protection.
The encapsulation is resistant to all cleaning solvents in
accordance with IEC 60068-2-45.
FEATURES
•Metal film technology
•High pulse load (up to 10 kV) capability
•Replacement for carbon-composition resistors
•Compatible with lead (Pb)-free and lead containing
soldering processes
•Compliant to RoHS directive 2002/95/EC
APPLICATIONS
•Automotive
•Telecommunication
•Industrial
•Medical equipment
TECHNICAL SPECIFICATIONS
DESCRIPTION SR37
Resistance Range 220 Ωto 10 kΩ
Resistance Tolerance ± 10 %, ± 20 %, E12 series
Temperature Coefficient ± 250 ppm/K
Climatic Category
(LCT/UCT/Days) 55/155/56
Rated Dissipation, P70 0.5 W
Rated Voltage, Umax.
Voltage Proof on Insulation 700 V
Basic Specification IEC 60115-1
Stability After:
Load (1000 h, P70)± (3 %R +0.1Ω)
Long Term Damp Heat Test (56 Days) ± (3 % R +0.1Ω)
Soldering (10 s, 260 °C) ± (1 % R +0.1Ω)
High Voltage Pulse Test for R-Value
≤ 4.7 kΩ, 10 kV; 1 nF; 50 x 12/Min ± 20 %
Pn x R
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Revision: 19-Oct-09 155
SR37
Surge Metal Film Leaded Resistor Vishay BCcomponents
Notes:
(1) The PART NUMBER is shown to facilitate the introduction of the unified part numbering system
(2) Please refer to table PACKAGING, see next page
DIMENSIONS
MARKING
The nominal resistance and tolerance are marked on the resistor using three colored bands for ± 20 % tolerance and four bands
for ± 10 % tolerance in accordance with IEC 60062, marking codes for resistors and capacitors. Standard values of nominal
resistance are taken from the E12 series for resistors with a tolerance of ± 10 % or ± 20 %. The values of the E12 series are in
accordance with IEC 60063.
PART NUMBER AND PRODUCT DESCRIPTION (1)
PART NUMBER: SR03700001501KR500
MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE PACKAGING (2) SPECIAL
SR03700 0 = Neutral 0 = Standard 3 digit value
1 digit multiplier
MULTIPLIER
3 = *103
4 = *104
5 = *105
K = ± 10 %
M = ± 20 %
A1
R5
Up to 2 digits
00 = Standard
PRODUCT DESCRIPTION: SR037 10 % R5 1K5
SR037 10 % R5 1K5
MODEL TOLERANCE PACKAGING (2) RESISTANCE VALUE
SR03700 ± 10 %
± 20 %
A1
R5
1K5 = 1.5 kΩ
PACKAGING
MODEL
REEL BOX
PIECES CODE PIECES CODE
SR37 5000 R5 1000 A1
Ø D
L1
Ø d
L2
A
DIMENSIONS - Resistor types, mass and relevant physical dimensions
TYPE L1 max.
(mm)
L2 max.
(mm)
Dmax.
(mm)
Ø d
(mm)
A
(mm)
MASS (g)/
100 pieces
SR37 9.0 11.0 4.0 0.80 ± 0.03 52.5 ± 1.5 50.5
370RS00001501KR500
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SR37
Vishay BCcomponents Surge Metal Film Leaded Resistor
FUNCTIONAL PERFORMANCE
PULSE LOADING CAPABILITY
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with IEC 60115-1, category 55/155/56 (rated temperature range - 55 to + 155
°C; damp heat, steady state, 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 tests 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 IEC applications were
necessary for our specified method.
Maximum dissipation (Pmax.) in percentage of rated power as a function of ambient temperature (T
amb)
Pulse on a regular basis; maximum permissible peak pulse power (Pmax) as a function of pulse duration (ti) for single pulse condition
0
100
- 55 0 70 155
Ambient temperature amb
Power Dissipation
P
Derating - Standard Operation
ϑ
1
(W)
P
i (s)
10
100
1000
10 000
100 000
0.000001 0.00001 0.0001 0.001 0.01 0.1 1
t
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SR37
Surge Metal Film Leaded Resistor Vishay BCcomponents
PERFORMANCE
IEC
60115-1
CLAUSE
IEC
60068-2-xx
TEST
METHOD
TEST PROCEDURE
REQUIREMENTS
PERMISSIBLE CHANGE (ΔR)
SR37
4.8 - Temperature
coefficient Between - 55 °C and + 155 °C ± 250 ppm/K
4.25.1 - Endurance at 70 °C
1000 h;
loaded with P70 or Umax.;
1.5 h ON; 0.5 h OFF
± (3 % R + 0.1 Ω)
4.24 78 (Cab) Damp heat,
steady state
56 days; 40 °C;
90 % to 95 % RH
loaded with 0.01 P70
± (3 % R + 0.1 Ω)
4.23 Climatic sequence
± (3 % R + 0.1 Ω)
4.23.2 2 (Ba) Dry heat 155 °C; 16 h dry heat
4.23.3 30 (Db) Damp heat
(accelerated)
24 h; 25 °C to 55 °C;
90 % to 100 % RH
1st cycle
4.23.4 1 (Aa) Cold - 55 °C; 2 h
4.23.6 30 (Db)
Damp heat,
(accelerated)
remaining cycles
5 days; 25 °C to 55 °C
90 % to 100 % RH
4.19 14 (Na) Rapid change of
temperature
30 min at LCT;
30 min at UCT;
LCT = - 55 °C;
UCT = 155 °C;
5 cycles
No visual damage
± (1 % R + 0.1 Ω)
4.26 - Active flammability
“Cheese-cloth test“
Steps of:
5/10/16/25/40 x P70 duration
5 min
No flaming of gauze cylinder
--
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
--
High voltage pulse
test
For R-value ≤ 4.7 kΩ, 10 kV;
1 nF; 50 x 12/min
(in accordance with
IEC 60065 14.1.a)
± 20 % R
4.16 Robustness of
terminations:
No damage
± (1 % R + 0.1 Ω)
4.16.2 21 (Ua1) Tensile all samples Load 10 N; 10 s
4.16.3 21 (Ub) Bending half number
of samples Load 5 N; 4 x 90°
4.16.4 21 (Uc) Torsion other half of
samples 3 x 360° in opposite direction
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)
± (1 % R + 0.1 Ω)
4.17 20 (Ta) Solderability
(after ageing)
2 s; 235 °C: Solder bath method;
SnPb40
3 s; 245 °C: Solder bath method;
SnAg3Cu0.5
Good tinning
(≥ 95 % covered);
no visible damage
4.18 20 (Tb) Resistance to
soldering heat
Thermal shock: 10 s; 260 °C;
3 mm from body ± (1 % R + 0.1 Ω)
4.29 45 (XA) Component solvent
resistance
Isopropyl alcohol or H2O
followed by brushing No visible damage
4.6.1.1 - Insulation resistance
U = 500 VDC
during 1 min,
V-block method
Rins min. 104 MΩ
4.7 - Voltage proof on
insulation
URMS = 700 V
during 1 min,
V-block method
No flashover or breakdown
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158 Revision: 19-Oct-09
SR37
Vishay BCcomponents Surge Metal Film Leaded Resistor
12NC INFORMATION FOR HISTORICAL CODING REFERENCE ONLY
•The resistors have a 12 digit ordering code starting with
2306
•The next 5 digits indicate the resistor type and packaging.
The last 3 digits indicate resistance value in which:
- The first 2 digits indicate the resistance value
- The last digit indicates the resistance decade in
accordance with table
Last Digit of 12NC Indicating Resistance Decade
12NC Example
SR37, 1.5 kΩ, ± 10 %, reel 5000 pieces is 2306 245 33152
RESISTANCE DECADE LAST DIGIT
220 Ω to 910 Ω1
1 kΩ to 9.1 kΩ2
10 kΩ3
12NC - Resistor type and packaging
DESCRIPTION
2306 ... .....
BANDOLIER IN AMMOPACK BANDOLIER ON REEL
TYPE TAPE WIDTH TOLERANCE 1000 UNITS 5000 UNITS
SR37 52.5
± 10 % 245 31.... 245 33....
± 20 % 245 11... 245 23...
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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All product specifications and data are subject to change without notice.
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