Standard Metal Film Resistors
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34 Revision: 01-Oct-07
SFR16S/25/25H
Vishay BCcomponents
A homogeneous film of metal alloy is deposited on a high
grade ceramic body. After a helical groove has been cut in
the resistive layer, tinned connecting leads of electrolytic
copper are welded to the end-caps.
The resistors are coated with a colored lacquer (light-blue for
type SFR16S; light-green for type SFR25 and red-brown for
type SFR25H) 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 60068-2045”.
FEATURES
•Low cost
•Low noise (max 1.5 µV/V for R > 1 MΩ)
•Small size (SFR16S-0204, SFR25/25H-0207)
•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
•General purpose resistors
Note:
R value is measured with probe distance of 24 ± 1 mm using 4-terminal method
TECHNICAL SPECIFICATIONS
DESCRIPTION VALUE
SFR16S SFR25 SFR25H
Resistance range
± 5 %; 1 Ωto 3 MΩ± 5 %; 0.22 Ωto 10 MΩ
± 1 %; 4.99 Ωto3MΩ± 1 %; 1 Ωto 10 MΩ
jumper (0 Ω) jumper (0 Ω)
Resistance tolerance ± 1 %, E24/E96 series; ± 5 %, E24 series
Temperature coefficient:
R<4.7 Ω≤ ± 250 x 10-6/K ≤ ± 100 x 10-6/K ≤ ± 100 x 10-6/K
4.7 Ω≤ R≤100 kΩ≤ ± 100 x 10-6/K ≤ ± 100 x 10-6/K ≤ ± 100 x 10-6/K
100 kΩ<R≤1MΩ≤ ± 250 x 10-6/K ≤ ± 100 x 10-6/K ≤ ± 100 x 10-6/K
R>1MΩ≤ ± 250 x 10-6/K ≤ ± 250 x 10-6/K ≤ ± 250 x 10-6/K
Absolute maximum dissipation at Tamb = 70 °C 0.5 W 0.4 W 0.5 W
Thermal resistance, Rth 170 K/W 200 K/W 150 K/W
Maximum permissible voltage 200 V 250 V 350 V
Noise:
R<68 kΩmax. 0.1 µV/V max. 0.1 µV/V max. 0.1 µV/V
68 kΩ≤R≤ 100 kΩmax. 0.5 µV/V max. 0.1 µV/V max. 0.1 µV/V
100 kΩ≤R≤ 1MΩmax. 1.5 µV/V max. 0.1 µV/V max. 0.1 µV/V
R>1MΩmax. 1.5 µV/V max. 1.5 µV/V max. 1.5 µV/V
Basic specifications IEC 60115-1 and 60115-2
Climatic category (IEC 60068) 55/155/56
Stability, ΔR max., after:
load:
R range ± (2 % R + 0.05 Ω)± (2 %R + 0.05 Ω)± (2 %R + 0.05 Ω)
climatic tests:
R≤ 1MΩ± (1 % R + 0.05 Ω)± (1 %R + 0.05 Ω)± (1 %R + 0.05 Ω)
R>1MΩ± (1 % R + 0.05 Ω)± (1 %R + 0.05 Ω)± (2 %R + 0.1 Ω)
Soldering ± (0.25 % R + 0.05 Ω) ± (0.25 % R + 0.05 Ω) ± (0.25 % R + 0.05 Ω)
Short time overload ± (0.25 % R + 0.05 Ω) ± (0.25 % R + 0.05 Ω)± (1 %R + 0.05 Ω)
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SFR16S/25/25H
Standard Metal Film Resistors Vishay BCcomponents
12NC INFORMATION
•The resistors have a 12-digit numeric code starting with 23.
•The subsequent 6 digits for 1 % or 7 digits for 5 % indicate
the resistor type and packaging.
•The remaining digits indicate the resistance value:
– The first 3 digits for 1 % or 2 digits for 5 % indicate the
resistance value.
– The last digit indicates the resistance decade.
Last Digit of 12NC for ± 5 % Tolerance
Last Digit of 12NC for ± 1 % Tolerance
12NC Example
The 12NC of a SFR25 resistor, value 5600 Ω± 5 %, taped on
a bandolier of 5000 units in ammopack is: 2322 181 43562.
Notes:
(1) The jumper has a maximum resistance Rmax = 30 mΩ at 3 A (SFR16S).
(2) The jumper has a maximum resistance Rmax = 10 mΩ at 5 A (SFR25).
Notes:
(3) Please refer to table PACKAGING.
• The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products.
RESISTANCE DECADE LAST DIGIT
0.10 to 0.91 Ω7
1to9.1Ω8
10 to 91 Ω9
100 to 910 Ω1
1to9.1kΩ2
10 to 91 kΩ3
100 to 910 kΩ4
1to9.1MΩ5
≥ 10 MΩ6
RESISTANCE DECADE LAST DIGIT
1to9.76Ω8
10 to 97.6 Ω9
100 to 976 Ω1
1to9.76kΩ2
10 to 97.6 kΩ3
100 to 976 kΩ4
1to9.76MΩ5
≥ 10 MΩ6
12NC - resistor type and pPackaging
TYPE TOL.
ORDERING CODE 23.. ... .....
BANDOLIER
IN AMMOPACK
BANDOLIER
ON REEL
RADIAL TAPED STRAIGHT LEADS STRAIGHT LEADS
4000 units 1000 units 5000 units 5000 units
SFR16S
± 5 % −..22 187 73... ..22 187 53... ..06 187 23...
± 1 % −−..06 187 3... ..06 187 1....
jumper (1) −−..06 187 90013 ..22 187 90346
SFR25
± 5 % ..06 184 03... ..22 181 53... ..22 181 43... ..22 181 63...
± 1 % −−..22 188 2... ..06 181 8....
jumper (2) −..22 181 90018 ..22 181 90019 ..06 181 90011
SFR25H ± 5 % −..22 186 16... ..22 186 76... ..06 186 63...
± 1 % −−..22 186 3.... ..06 186 8....
PART NUMBER
PART NUMBER: SFR2500001001FA500
MODEL/SIZE SPECIAL CHARACTER TCR/MATERIAL VALUE TOLERANCE PA CK A G I N G (3) SPECIAL
SFR16S0
SFR2500
SFR25H0
0 = neutral
Z = value overflow
(Special)
0 = standard
Z = jumper
3 digit value
1 digit multiplier
Multiplier:
F = ± 1 %
J = ± 5 %
Z = jumper
N4
A5
A1
R5
The 2 digits
are used for
all special
parts.
00 = standard
7 = *10-3
8 = *10-2
9 = *10-1
0 = *100
1 = *101
2 = *102
3= *103
4 = *104
5 = *105
Z = 0000
PRODUCT DESCRIPTION: SFR25 1 % A5 1K0
SFR25 1 % A5 1K0
MODEL/SIZE TOLERANCE PACKAGING (3) RESISTANCE VALUE
SFR16S
SFR25
SFR25H
± 1 %
± 5 %
A1
A5
47K = 47 KΩ
51R1 = 51.1 Ω
25RFS 00001001FA500
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36 Revision: 01-Oct-07
SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Resistors
DIMENSIONS
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 publication 60294”).
MARKING
The nominal resistance and tolerance are marked on the
resistor using four or five coloured 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 series for resistors with a tolerance of ± 1 % or ± 5 %.
The values of the E96/E24 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.
PACKAGING
CODE PIECES DESCRIPTION MODEL/SIZE
N4 4000 Bandolier in ammopack radial taped SFR25
A5 5000 Bandolier in ammopack straight leads SFR16S, SFR25, SFR25H
A1 1000 Bandolier in ammopack straight leads SFR16S, SFR25, SFR25H
R5 5000 Bandolier on reel straight leads SFR16S, SFR25, SFR25H
Ø D
L1
Ø d
Outline
L2
DIMENSIONS
- resistor types and relevant physical dimensions in millimeters
TYPE Ø D
MAX.
L1
MAX.
L2
MAX. Ø d
SFR16S 1.9 3.5 4.1 0.45 ± 0.05
SFR25 2.5 6.5 7.5 0.58 ± 0.05
SFR25H 2.5 6.5 7.5 0.58 ± 0.05
MASS PER 100 UNITS
TYPE MASS
(g)
SFR16S 10.2
SFR25 20.5
SFR25H 20.5
LIMITING VALUES
TYPE LIMITING VOLTAGE (1)
(V)
LIMITING POWER
(W)
SFR16S 200 0.5
SFR25 250 0.4
SFR25H 350 0.5
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Revision: 01-Oct-07 37
SFR16S/25/25H
Standard Metal Film Resistors Vishay BCcomponents
- 55 70 0
T
a
m
b
(°C)
50
max
(%
rated
)
0
50
100
100 155
> 1 MΩ
P
P
R
Maximum dissipation (Pmax) in percentage of
rated power as a function of the
ambient temperature (Tamb).
The power that the resistor can dissipate depends on the operating temperature
Derating
10
-5
10
-4
10
-3
10
-2
10
-1
1
10
3
1
10
10
2
ma x
(W )
i
(s)
10
-6
10
-1
200
100
50
20
10
5
2
/ = 1000
i
t
p
t
P
t
500
SFR16S Pulse on a regular basis; maximum permissible peak pulse power ( max) as a function of pulse duration (ti)
P
600
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
500
400
300
200
100
max
(V)
i
(s)
V
t
SFR16S Pulse on a regular basis; maximum permissible peak pulse voltage ( max) as a function of pulse duration (ti)V
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38 Revision: 01-Oct-07
SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Resistors
Pulse Loading Capabilities
10
-5 10
-4 10
-3 10
-2 10
-1 1
10
3
1
10
10
2
max
(W)
10
-6
10
-1
2
5
10
20
50
100
200
500
/ = 1000
i
(s)
t
P
i
t
p
t
SFR25 Pulse on a regular basis; maximum permissible peak pulse power ( max) as a function of pulse duration (ti)
P
600
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
500
400
300
200
100
max
(V)
V
i(s)
t
SFR25 Pulse on a regular basis; maximum permissible peak pulse voltage ( max) as a function of pulse duration (ti)V
10
-5 10
-4 10
-3 10
-2 10
-1 1
10
3
1
10
10
2
10
-6
10
-1
2
5
10
20
50
100
200
500
i(s)
t
max
(W)
/ = 1000
P
i
t
p
t
SFR25H Pulse on a regular basis; maximum permissible peak pulse power ( max) as a function of pulse duration (ti)
P
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SFR16S/25/25H
Standard Metal Film Resistors Vishay BCcomponents
handbook, full pagewidt h
1200
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
800
400
max
(V)
V
i
(s)
t
SFR25H Pulse on a regular basis; maximum permissible peak pulse voltage ( max) as a function of pulse duration (ti)V
Pulse Loading Capabilities
0 0.2 0.4 0.8
100
0
50
0.6 (W )
(K)
∆
P
T
SFR16S Hot-spot temperature rise (ΔT) as a function of dissipated power
0 0.5
100
0
20
40
60
80
0.1 0.2 0.3 0.4
(W )
∆
(K) SFR25
SFR25H
P
T
SFR25/SFR25H Hot-spot temperature rise (ΔT) as a function of dissipated power
Application Information
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40 Revision: 01-Oct-07
SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Resistors
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with the
schedule of “IEC publication 60115-1”, category 55/155/56
(rated temperature range - 55 °C to + 155 °C; 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.
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST PROCEDURE
RESISTANCE
RANGE
REQUIREMENTS
SFR16S SFR25 SFR25H
4.16 21 (U) robustness of
terminations:
4.16.2 21 (Ua1) tensile all samples
Ø 0.45 mm, load 5 N;
10 seconds number of failures < 10 x 10-6
Ø 0.58 mm, load 10 N;
10 seconds
4.16.3 21 (Ub) bending half
number of samples
Ø 0.45 mm, load 2.5 N; 4 x 90°
number of failures < 10 x 10-6
Ø 0.58 mm, load 5 N; 4 x 90°
4.16.4 21 (Uc) torsion other half of
samples 3 x 360° in opposite directions no damage
ΔR max.: ± (0.25 % R + 0.05 Ω)
4.17 20 (Ta) solderability 2 seconds; 235 °C; flux 600 good tinning; no damage
4.18 20 (Tb) resistance to
soldering heat
3.5 seconds; 350 °C;
solder bath method ΔR max.: ± (0.25 % R + 0.05 Ω)
4.19 14 (Na) rapid change of
temperature
30 minutes at - 55 °C and
30 minutes at + 155 °C; 5 cycles ΔR max.: ± (0.25 % R + 0.05 Ω)
4.20 29 (Eb) bump 3 x 1500 bumps in 3 directions;
40 g
no damage
ΔR max.: ± (0.25 % R + 0.05 Ω)
4.22 6 (Fc) vibration
Frequency 10 Hz to 500 Hz;
displacement 1.5 mm or
acceleration 10 g; 3 directions;
total 6 hours (3 x 2 hours)
no damage
ΔR max.: ± (0.25 % R + 0.05 Ω)
4.23
climatic sequence
:Rins min.: 1000 MΩ
4.23.2 2 (Ba) dry heat 16 hours; 155 °C
4.23.3 30 (Db)
damp heat
(accelerated)
1st 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 °C to 35 °C
4.23.6 30 (Db)
damp heat
(accelerated)
remaining cycles
5days; 55°C;
95 % to 100 % RH
R≤1MΩΔR max.: ± (1 % R + 0.05 Ω)
R>1MΩΔR max.: ± (1 % R + 0.05 Ω)ΔR max.
± (2 % R +0.1
4.24.2 3 (Ca) damp heat
(steady state)
56 days; 40 °C;
90 % to 95 % RH;
dissipation 0.01 Pn
Rins min.: 1000 MΩ
ΔR max.: ± (2 % R + 0.05 Ω)
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SFR16S/25/25H
Standard Metal Film Resistors Vishay BCcomponents
4.25.1 endurance 1000 hours at 70 °C;
Pn or Vmax
ΔR max.: ± (2 % R+ 0.05 Ω)
4.8.4 temperature
coefficient
between - 55 °C and
+ 155 °C (TCR x 10-6/K)
R<4.7 Ω≤ ± 250 ≤ ± 100 ≤ ± 100
R≤100 kΩ≤ ± 100 ≤ ± 100 ≤ ± 100
R≤1MΩ≤ ± 250 ≤ ± 100 ≤ ± 100
R>1MΩ≤ ± 250 ≤ ± 250 ≤ ± 250
4.7 voltage proof on
insulation
URMS = 400 V (SFR16S) or
URMS = 600 V (SFR25 and
SFR25H); during 1 minute;
V-block method
no breakdown
4.12 noise “IEC publication 60195”
R<68 kΩmax. 0.1 µV/V max. 0.1 µV/V max. 0.1 µV/V
R≤100 kΩmax. 0.5 µV/V max. 0.1 µV/V max. 0.1 µV/V
R≤1MΩmax. 1.5 µV/V max. 0.1 µV/V max. 0.1 µV/V
R>1MΩmax. 1.5 µV/V max. 1.5 µV/V max. 1.5 µV/V
4.6.1.1 insulation
resistance
Umax DC = 500 V during
1 minute; V-block method Rins min.: 1000 MΩ
4.13 short time overload
Room temperature;
P = 6.25 x Pn (SFR25)
or 6.25 x 0.25 W (SFR16S);
5 seconds ON,
45 seconds OFF
(V ≤2x V
max); 10 cycles
ΔR max.:
± (0.25 % R + 0.05 Ω)
ΔR max.:
± (1 % R
+0.05Ω)
intermittent
overload in
accordance with
“JIS-C5202 5.8”
16 x 0.16 W;
1 seconds ON and
25 seconds OFF;
10 000 ± 200 cycles;
Vmax = 600 V
ΔRmax.:
± (0.75 % R
+ 0.05 Ω)
−−
see 2nd amendment
to “IEC 60115-1”,
Jan. ’87
pulse load see Pulse Loading Capabilities graphs
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST PROCEDURE
RESISTANCE
RANGE
REQUIREMENTS
SFR16S SFR25 SFR25H
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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
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