Standard Metal Film Leaded Resistors
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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 IEC 60068-2-45.
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
•Compliant to RoHS directive 2002/95/EC
APPLICATIONS
•General purpose resistors
Note
•R value is measured with probe distance of 24 mm ± 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 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
4.7 Ω≤ R≤100 kΩ≤ ± 100 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
100 kΩ<R≤1MΩ≤ ± 250 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
R>1MΩ≤ ± 250 ppm/K ≤ ± 250 ppm/K ≤ ± 250 ppm/K
Rated Dissipation, P70 0.5 W 0.4 W 0.5 W
Thermal Resistance, Rth 170 K/W 200 K/W 150 K/W
Maximum Permissible Voltage, (Umax. AC/DC) 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
Climatic Category (IEC 60068-1) 55/155/56
Stability, ΔR max., After:
Load (1000 h, P70):
R Range ± (2 % R + 0.05 Ω)± (2 %R + 0.05 Ω)± (2 %R + 0.05 Ω)
Long Term Damp Heat Test (56 Days):
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 (10 s, 260 °C) ± (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 Leaded Resistors Vishay BCcomponents
Notes
(1) Please refer to table PACKAGING
• The jumper has a maximum resistance Rmax. = 30 mΩ at 3 A (SFR16S)
• The jumper has a maximum resistance Rmax. = 10 mΩ at 5 A (SFR25)
• The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products
DIMENSIONS
PART NUMBER AND PRODUCT DESCRIPTION
PART NUMBER: SFR2500001001FA500
MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE PACKAGING (1) 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 (1) RESISTANCE VALUE
SFR16S
SFR25
SFR25H
± 1 %
± 5 %
N4
A5
A1
R5
47K = 47 kΩ
51R1 = 51.1 Ω
PACKAGING
MODEL TAPING
AMMO PACK REEL
PIECES CODE PIECES CODE
SFR16S, SFR25, SFR25H Axial, 52 mm
5000 A5
5000 R5
1000 A1
SFR25, SFR25H Radial 4000 N4 - -
DIMENSIONS - resistor types and relevant physical dimensions in millimeters
TYPE Ø Dmax. 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
Ø D
L1
Ø d
Outline
L2
25RFS00001001FA500
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SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Leaded Resistors
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).
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.
PRODUCTS WITH RADIAL LEADS (SFR25, SFR25H)
Note
• Please refer document number 28721 “Packaging” for more detail
MASS PER UNIT
TYPE MASS
(mg)
SFR16S 102
SFR25 205
SFR25H 205
DIMENSIONS - RADIAL TAPING
SYMBOL PARAMETER VALUE TOLERANCE UNIT
P Pitch of components 12.7 ± 1.0 mm
P0Feed-hole pitch 12.7 ± 0.2 mm
P1Feed-hole centre to lead at topside at the tape 3.85 ± 0.5 mm
P2Feed-hole center to body center 6.35 ± 1.0 mm
F Lead-to-lead distance 4.8 + 0.7/- 0 mm
W Tape width 18.0 ± 0.5 mm
W0Minimum hold down tape width 5.5 - mm
H1Component height 29 Max. mm
H0Lead wire clinch height 16.5 ± 0.5 mm
H Height of component from tape center 19.5 ± 1 mm
D0Feed-hole diameter 4.0 ± 0.2 mm
L Maximum length of snipped lead 11.0 - mm
L1Minimum lead wire (tape portion) shortest lead 2.5 - mm
P
P2
W
W0
D0
P1
P0
L1
L
F
H0
H1
H
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SFR16S/25/25H
Standard Metal Film Leaded Resistors Vishay BCcomponents
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 60063.
- 55 70 0
T
a
m
b
(°C)
50
max.
(%
rated
)
0
50
100
100 155
P
P
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
max.
(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
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SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Leaded Resistors
Pulse Loading Capabilities
600
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
500
400
300
200
100
max.
(V)
i
(s)
U
t
SFR16S Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
U
10-5 10-4 10-3 10-2 10-1 1
103
1
10
102
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)
U
i(s)
t
SFR25 Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
U
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SFR16S/25/25H
Standard Metal Film Leaded Resistors Vishay BCcomponents
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
h
1200
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
800
400
max.
(V)
U
i
(s)
t
SFR25H Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
U
Pulse Loading Capabilities
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SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Leaded Resistors
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
00.5
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
Note
• The maximum permissible hot-spot temperature is 155 °C.
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SFR16S/25/25H
Standard Metal Film Leaded Resistors Vishay BCcomponents
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, 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 in-
stances 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
RESISTANCE
RANGE
REQUIREMENTS
SFR16S SFR25 SFR25H
4.16 Robustness of
terminations:
4.16.2 21 (Ua1) Tensile all
samples
Ø 0.45 mm, load 5 N; 10 s
Ø 0.58 mm, load 10 N; 10 s Number of failures < 10 x 10-6
4.16.3 21 (Ub)
Bending half
number of
samples
Ø 0.45 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 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
(SnAgCu0.5) 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 ΔR max.: ± (0.25 % R + 0.05 Ω)
4.19 14 (Na) Rapid change of
temperature
30 min at - 55 °C and
30 min 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 h (3 x 2 h)
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 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
4.23.6 30 (Db)
Damp heat
(accelerated)
remaining cycles
5 days; 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 Ω)
4.24 78 (Cab) Damp heat
(steady state)
56 days; 40 °C;
90 % to 95 % RH;
loaded with 0.01 P70
(Steps: 0 V to 100 V)
Rins min.: 1000 MΩ
ΔR max.: ± (2 % R + 0.05 Ω)
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SFR16S/25/25H
Vishay BCcomponents Standard Metal Film Leaded Resistors
HISTORICAL 12NC INFORMATION
•The resistors had a 12-digit numeric code starting with 23.
•The subsequent 6 digits for 1 % or 7 digits for 5 % indicated
the resistor type and packaging.
•The remaining digits indicated the resistance value:
- The first 3 digits for 1 % or 2 digits for 5 % indicated the
resistance value.
- The last digit indicated the resistance decade.
Resistance Decade for ± 5 % Tolerance
Resistance Decade for ± 1 % Tolerance
12NC Example
The 12NC of a SFR25 resistor, value 5600 Ω± 5 %, taped on
a bandolier of 5000 units in ammopack was:
2322 181 43562.
4.25.1 Endurance
(at 70 °C)
1000 h;
loaded with P70 or Umax.;
1.5 h ON and 0.5 h OFF
ΔR max.: ± (2 % R+ 0.05 Ω)
4.8 Temperature
coefficient
Between
- 55 °C and + 155 °C
R<4.7 Ω≤ ± 250 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
R≤100 kΩ≤ ± 100 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
R≤1MΩ≤ ± 250 ppm/K ≤ ± 100 ppm/K ≤ ± 100 ppm/K
R>1MΩ≤ ± 250 ppm/K ≤ ± 250 ppm/K ≤ ± 250 ppm/K
4.7 Voltage proof on
insulation
URMS = 400 V (SFR16S) or
URMS = 600 V (SFR25 and
SFR25H); during 1 min;
V-block method
No breakdown
4.12 Noise IEC 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 min;
V-block method
Rins min.: 1000 MΩ
4.13 Short time
overload
Room temperature;
P = 6.25 x Pn
(SFR25, SFR25H) or
6.25 x 0.25 W (SFR16S);
(voltage not more than
2 x limiting voltage); 10 cycles;
5 s ON and 45 s OFF
ΔR max.:
± (0.25 % R + 0.05 Ω)
ΔR max.:
± (1 % R
+0.05Ω)
TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2-
TEST
METHOD
TEST PROCEDURE
RESISTANCE
RANGE
REQUIREMENTS
SFR16S SFR25 SFR25H
RESISTANCE DECADE LAST DIGIT
0.10 Ω to 0.91 Ω7
1Ω to 9.1 Ω8
10 Ω o91Ω9
100 Ω to 910 Ω1
1 kΩ to 9.1 kΩ2
10 kΩ to 91 kΩ3
100 kΩ to 910 kΩ4
1 MΩ to 9.1 MΩ5
= 10 MΩ6
RESISTANCE DECADE LAST DIGIT
1Ωto 9.76 Ω8
10 Ωto 97.6 Ω9
100 Ωto 976 Ω1
1kΩto 9.76 kΩ2
10 kΩto 97.6 kΩ3
100 kΩto 976 kΩ4
1MΩto 9.76 MΩ5
= 10 MΩ6
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SFR16S/25/25H
Standard Metal Film Leaded Resistors Vishay BCcomponents
HISTORICAL 12NC - Resistor type and packaging
TYPE TOL.
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 - - ..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 - ..22 181 90018 ..22 181 90019 ..06 181 90011
SFR25H
± 5 % ..06 186 03... ..22 186 16... ..22 186 76... ..06 186 63...
± 1 % - - ..22 186 3.... ..06 186 8....
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.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
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