SFR16S/25/25H
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Standard Metal Film Leaded Resistors
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 M)
• 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
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• General purpose resistors
Note
•R value is measured with probe distance of 24 mm ± 1 mm using 4-terminal method
TECHNICAL SPECIFICATIONS
DESCRIPTION UNIT SFR16S SFR25 SFR25H
Resistance Range
5 %; 1 to 3M ± 5 %; 0.22 to 10M
1 %; 4.99 to 3M 1 %; 1 to 10M
Jumper (0 )Jumper (0)
Resistance Tolerance % 1, E24/E96 series; 5, E24 series
Temperature Coefficient:
ppm/K
R 4.7 250 100 100
4.7  R 100 k100  100  100
100 kR 1M 250  100 ± 100
R 1M250  250  250
Rated Dissipation, P70 W 0.5 0.4 0.5
Thermal Resistance, Rth K/W 170 200 150
Maximum Permissible Voltage, (Umax. AC/DC) V 200 250 350
Noise:
μV/V
R 68 kmax. 0.1 max. 0.1 max. 0.1
68 kR 100 kmax. 0.5 max. 0.1 max. 0.1
100 kR 1Mmax. 1.5 max. 0.1 max. 0.1
R 1Mmax. 1.5 max. 1.5 max. 1.5
Basic Specifications IEC 60115-1
Climatic Category (IEC 60068-1) 55/155/56
Stability, R max., after:
Load (1000 h, P70):
R Range (2 % R + 0.05 ) (2 % R + 0.05 ) (2 % R + 0.05 )
Long Term Damp Heat Test (56 Days):
R 1M (1 % R + 0.05 ) (1 % R + 0.05 ) (1 % R + 0.05)
R1M (1 % R + 0.05 ) (1 % R + 0.05 ) (2 % R + 0.1 )
Soldering (10 s, 260 °C) (0.25 % R + 0.05 ) ± (0.25 % R + 0.05 ) ± (0.25 % R + 0.05 )
Short Time Overload ± (0.25 % R + 0.05 ) (0.25 % R + 0.05 ) (1 % R + 0.05 )
SFR16S/25/25H
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Notes
(1) Please refer to table PACKAGING
• The jumper has a maximum resistance Rmax. = 30 m at 3 A (SFR16S)
• The jumper has a maximum resistance Rmax. = 30 m 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 DECSRIPTION
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 k
51R1 = 51.1
PACKAGING
MODEL TOLERANCE TAPING AMMO PACK REEL
PIECES CODE PIECES CODE
SFR16S 1 % Axial, 52 mm 5000 A5 5000 R5
SFR16S 5 % Axial, 52 mm 5000 A5 5000 R5
1000 A1
SFR25, SFR25H 1 % Axial, 52 mm 5000 A5 5000 R5
SFR25, SFR25H 5 % Axial, 52 mm 5000 A5 5000 R5
1000 A1
SFR25, SFR25H 1 % Radial 4000 N4 - -
SFR25, SFR25H 5 % 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
SFR16S/25/25H
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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 to document “Packaging” for more detail (www.vishay.com/doc?28721).
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
H1 Component height 29 Max. mm
H0Lead wire clinch height 16.5 ± 0.5 mm
H0Height 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
SFR16S/25/25H
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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.
The power that the resistor can dissipate depends on the operating temperature
Maximum dissipation (Pmax.) in percentage of rated power as a function of the ambient temperature (Tamb)
SFR16S Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti)
- 55 70 0
Tamb (°C)
50
max.
(% rated)
0
50
100
100 155
P
P
Derating
10-5 10-4 10-3 10-2 10-1 1
103
1
10
102
max.
(W)
i(s)
10-6
10-1
200
100
50
20
10
5
2
/ = 1000
i
t
p
t
P
t
500
P
SFR16S/25/25H
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SFR16S Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
SFR25 Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti)
SFR25 Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
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
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
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
U
SFR16S/25/25H
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SFR25H Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti)
SFR25H Pulse on a regular basis; maximum permissible peak pulse voltage ( max.) as a function of pulse duration (ti)
10-5 10-4 10-3 10-2 10-1 1
103
1
10
102
10-6
10-1
2
5
10
20
50
100
200
500
i(s)
t
max.
(W) / = 1000
P
i
t
p
t
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
U
SFR16S/25/25H
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SFR16S Hot-spot temperature rise (T) as a function of dissipated power
SFR25/SFR25H Hot-spot temperature rise (T) as a function of dissipated power
Note
• The maximum permissible hot-spot temperature is 155 °C.
Application Information
0 0.2 0.4 0.8
100
0
50
0.6 (W )
(K)
∆
P
T
00.5
100
0
20
40
60
80
0.1 0.2 0.3 0.4
(W)
∆
(K) SFR25
SFR25H
P
T
SFR16S/25/25H
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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 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 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°
Ø 0.58 mm,
load 5 N; 4 x 90°
Number of failures < 10 x 10-6
4.16.4 21 (Uc) Torsion other
half of samples
3 x 360°
in opposite directions
No damage
R max.: ± (0.25 % R + 0.05 )
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
R max.: ± (0.25 % R + 0.05 )
4.19 14 (Na) Rapid change
of temperature
30 min at - 55 °C and
30 min at + 155 °C;
5cycles
R max.: ± (0.25 % R + 0.05 )
4.20 29 (Eb) Bump
3 x 1500 bumps
in 3 directions;
40 g
No damage
R max.: ± (0.25 % R + 0.05 )
4.22 6 (Fc) Vibration
Frequency
10 Hz to 500 Hz;
displacement 1.5 mm
or acceleration 10 g;
3directions;
total 6 h (3 x 2 h)
No damage
R max.: ± (0.25 % R + 0.05 )
4.23 Climatic sequence: Rins min.: 1000 M
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 2h; 8.5kPa;
15 °C to 35 °C
4.23.6 30 (Db)
Damp heat
(accelerated)
remaining cycles
5 days; 55 °C;
95 % to 100 % RH
R1MR max.: ± (1 % R + 0.05 )
R1MR max.: ± (1 % R + 0.05 )
R max.:
± (2 % R
+0.1 )
SFR16S/25/25H
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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 ± 5 %, taped
on a bandolier of 5000 units in ammopack was:
2322 181 43562.
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 M
R max.: ± (2 % R + 0.05 )
4.25.1 Endurance
(at 70 °C)
1000 h;
loaded with P70 or Umax.;
1.5 h ON and 0.5 h OFF
R max.: ± (2 % R + 0.05 )
4.8 Temperature
coefficient
Between
- 55 °C and + 155 °C
R4.7  ± 250 ppm/K ± 100 ppm/K ± 100 ppm/K
R100 k ± 100 ppm/K ± 100 ppm/K ± 100 ppm/K
R1M ± 250 ppm/K ± 100 ppm/K ± 100 ppm/K
R1M ± 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<68kmax. 0.1 μV/V max. 0.1 μV/V max. 0.1 μV/V
R100 kmax. 0.5 μV/V max. 0.1 μV/V max. 0.1 μV/V
R1Mmax. 1.5 μV/V max. 0.1 μV/V max. 0.1 μV/V
R>1Mmax. 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 M
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
R max.:
0.25 % R + 0.05 )
R max.:
± 1 % R
+0.05)
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 to 0.91 7
1 to 9.1 8
10 o919
100 to 910 1
1 k to 9.1 k2
10 k to 91 k3
100 k to 910 k4
1 M to 9.1 M5
= 10 M6
RESISTANCE DECADE LAST DIGIT
1to 9.76 8
10 to 97.6 9
100 to 976 1
1kto 9.76 k2
10 kto 97.6 k3
100 kto 976 k4
1Mto 9.76 M5
= 10 M6
SFR16S/25/25H
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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....
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