NFR25, NFR25H
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Fusible, Non-Flammable Metal Film Leaded Resistors
DESCRIPTION
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 wires of electrolytic
copper are welded to the end-caps. The resistors are coated
with a gray, flame retardant lacquer which provides
electrical, mechanical, and climatic protection. The
encapsulant is resistant to all cleaning solvents in
accordance with IEC 60068-2-45.
FEATURES
• Technology: metal film
• Overload protection without risk of fire
• Wide range of overload currents (refer Fusing
Characteristics graphs)
• 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
•Audio
•Video
Notes
•R value is measured with probe distance of 24 mm ± 1 mm using 4-terminal method
(1) Ohmic values (other than resistance range) are available on request
TECHNICAL SPECIFICATIONS
DESCRIPTION NFR25 NFR25H
Resistance range (1) 0.22 to 15 k0.22 to 15 k
Resistance tolerance 5 % 5 %
Resistance series E24 E24
Rated dissipation P70 0.33 W 0.5 W
Thermal resistance (Rth) 240 K/W 150 K/W
Temperature coefficient
0.22 R 4.7
4.7 R 15
15 R 15 k
± 200 ppm/K
± 200 ppm/K
± 100 ppm/K
± 200 ppm/K
± 100 ppm/K
± 100 ppm/K
Operating voltage, Umax. DC or RMS 250 V 350 V
Basic specifications IEC 60 115-1 IEC 60 115-1
Climatic category (IEC 60068-1) 55/155/56 55/155/56
Maximum resistance change for resistance range,
R max., after:
Load (1000 h, P70): (1 % R + 0.05 (1 % R + 0.05
Long term damp heat test (56 days): (1 % R + 0.05 (1 % R + 0.05
Soldering (260 °C, 10 s): (0.25 % R + 0.05 (0.25 % R + 0.05
NFR25, NFR25H
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DIMENSIONS
Notes
• The PART NUMBER is shown to facilitate the introduction of the unified part numbering system
(1) Please refer to table PACKAGING, see next page
PACKAGING
MODEL TAPING AMMOPACK REEL
PIECES CODE PIECES CODE
NFR25, NFR25H Axial, 52 mm 5000 A5 5000 R5
1000 A1
NFR25, NFR25H Radial 2000 N2 - -
DIMENSIONS (Resistor types, mass, and relevant physical dimensions)
TYPE Dmax.
(mm)
L1 max.
(mm)
L2 max.
(mm)
Ø d
(mm)
MASS
(mg)
NFR25 2.5 6.5 7.5 0.58 ± 0.05 201
NFR25H
PART NUMBER AND PRODUCT DESCRIPTION
Part Number: NFR2500002207JA100
MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE
PACKAGING
(1)
SPECIAL
NFR2500
NFR25H0
0 = neutral
Z = value overload
(special)
0 = standard 3 digit value
1 digit multiplier
MULTIPLIER
7 = *10-3
8 = *10-2
9 = *10-1
0 = *100
1 = *101
2 = *102
J = ± 5 % N2
A5
A1
R5
Up to 2 digits
are used for
all special
parts.
00
= standard
Product Description: NFR25 5 % A1 R22
NFR25 5 % A1 R22
MODEL / SIZE TOLERANCE PACKAGING (1) RESISTANCE VALUE
NFR25
NFR25H
± 5 % N2
A5
A1
R5
1K0 = 1 k
4R7 = 4.7
Ø D
L1
L2
Ø d
Outline
25RFN 00002207JA100
NFR25, NFR25H
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PRODUCTS WITH RADIAL LEADS (NFR25, NFR25H)
Note
• Please refer document number 28721 “Packaging” for more detail
MARKING
The nominal resistance and tolerance are marked on the
resistor using four colored bands in accordance with
IEC 60062, marking codes for resistors and capacitors.
For ease of recognition a fifth ring is added, which is violet
for type NFR25 and white for type NFR25H.
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).
FUNCTIONAL PERFORMANCE,
PRODUCT CHARACTERIZATION
Standard values of nominal resistance are taken from the
E24 series for resistors with a tolerance of ± 5 %.
The values of the E24 series are in accordance with IEC
60063.
Note
(1) The maximum voltage that may be continuously applied to the resistor element, see IEC 60115-1. The maximum permissible hot-spot
temperature is 155 °C.
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 center 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 29.0 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
LIMITING VALUES
TYPE LIMITING VOLTAGE U (1)
(V)
LIMITING POWER P70
(W)
NFR25 250 0.33
NFR25H 350 0.5
NFR25, NFR25H
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DERATING
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)
FUSING CHARACTERISTICS
The resistors will fuse without the risk of fire and within an indicated range of overload. Fusing means that the resistive value of
the resistor increases at least 100 times.
The fusing characteristic is measured under constant voltage.
NFR25 This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1
NFR25 This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1 R 15
NFR25 This graph is based on measured data which may deviate according to the application.
Fusing Characteristics: 15 R 15 k
70 10050
0
0
50
100
155
-55
Pmax.
(% Prated)
Tamb (°C)
103
102
10
1
10-1
12
40 8
Poverload (W)
t
(s)
16 20 24
103
102
10
1
10-1
6
20 4
Poverload (W)
t
(s)
81012
103
102
10
1
10-1
6
20 4
Poverload (W)
t
(s)
81012
NFR25, NFR25H
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FUSING CHARACTERISTICS
NFR25H This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1
NFR25H This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1 R 15 k
PULSE LOADING CAPABILITIES
NFR25 Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti), 0.22 R 1 k
NFR25 Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti),15 R 15 k
103
102
10
1
10-1
12
40 8
Poverload (W)
t
(s)
16 20 24
103
102
10
1
10-1
12
40 8
Poverload (W)
t
(s)
16 20 24
103
102
10
1
10-1
50
20
10
5
2
ti (s)
tp/ti = 1000
10-6 10-5 10-4 10-310-2 10-1 1
500
200
100
Pmax.
(W)
ˆ
P
ˆ
20
2
100
103
102
10
1
10-1
ti (s)
10-6 10-5 10-4 10-310-2 10-1 1
Pmax.
(W)
ˆ
tp/ti = 1000
P
ˆ
NFR25, NFR25H
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PULSE LOADING CAPABILITIES
NFR25 Pulse on a regular basis; maximum permissible peak pulse power (Ûmax.) as a function of pulse duration (ti)
NFR25H Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti)
NFR25H Pulse on a regular basis; maximum permissible peak pulse power ( max.) as a function of pulse duration (ti)
600
ti (s)
10-6 10-5 10-4 10-310-2 10-1 1
Umax.
(V)
ˆ
500
400
300
200
100
0
2
5
10
20
50
100
200
500
103
102
10
1
10-1
ti (s)
10-6 10-5 10-4 10-310-2 10-1 1
Pmax.
(W)
ˆ
tp/ti = 1000
P
ˆ
1200
ti (s)
10-6 10-5 10-4 10-310-2 10-1 1
Umax.
(V)
ˆ
1000
800
600
400
200
0
P
ˆ
NFR25, NFR25H
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APPLICATION INFORMATION
NFR25 Hot-spot temperature rise (T)
as a function of dissipated power
Minimum distance from resistor body to PCB. = 1 mm
NFR25 Temperature rise (T) at the lead end (soldering point) as a
function of dissipated power at various lead lengths after mounting
NFR25H Hot-spot temperature rise (T)
as a function of dissipated power
Minimum distance from resistor body to PCB. = 1 mm
NFR25H Temperature rise (T) at the lead end (soldering point) as a
function of dissipated power at various lead lengths after mounting
TESTS AND REQUIREMENTES
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, long term, 56 days).
The tests are carried out in accordance with IEC 60068-2-xx
test method, “Recommended basic climatic and
mechanical robustness testing procedure for electronic
components” and 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 the IEC recommendations
were necessary for our method of specifying. For
inflammability requirements reference is made to
IEC 60115-1.
All soldering tests are performed with mildly activated flux.
100
0 0.2 0.6
00.4
20
40
60
80
P (W)
ΔT
(K)
50
0 0.2 0.6
00.4
10
20
30
40
P (W)
ΔT
(K)
15 mm
5 mm
10 mm
100
0 0.2 0.6
00.4
20
40
60
80
P (W)
ΔT
(K)
15 mm
5 mm
10 mm
50
0 0.2 0.6
00.4
10
20
30
40
P (W)
ΔT
(K)
NFR25, NFR25H
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TEST PROCEDURES AND REQUIREMENTS
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST PROCEDURE
REQUIREMENTS
NFR25 NFR25H
4.4.1 Visual examination No holes; clean surface; no damage
4.4.2 Dimensions (outline) Gauge (mm) See Dimensions Table
4.5
Resistance
(refer note on first page
for measuring distance)
Applied voltage (+ 0 % / - 10 %):
R < 10 : 0.1 V
10 R < 100 : 0.3 V
100 R < 1 k: 1 V
1 kR < 10 k 3 V
10 kR 15 k: 10 V
R - Rnom.: max. ± 5 %
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 )
4.29 45 (Xa) Component solvent
resistance
Isopropyl alcohol or H2O followed by
brushing No visual damage
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
(SnAg3Cu0.5) method
Good tinning (95 % covered); no damage
4.7 Voltage proof on
insulation
URMS = 500 V during 1 min;
metal block method No breakdown or flashover
4.16 Robustness of
terminations:
4.16.2 21 (Ua1) Tensile all samples Load 10 N; 10 s Number of failures < 10 x 10-6
4.16.3 21 (Ub) Bending half number
of samples 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 )
4.20 29 (Eb) Bump 3 x 1500 bumps in 3 directions; 40 gNo 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; 3 directions; total 6 h (3 x 2 h)
No damage
R max.: ± (0.25 % R + 0.05 )
4.19 14 (Na) Rapid change of
temperature 30 min at LCT and 30 min at UCT; 5 cycles No visual damage
R max.: ± (0.25 % R + 0.05 )
4.23 Climatic sequence:
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 Rins min. 103 M
R max.: ± (1.5 % R + 0.1 )
4.24 78 (Cab) Damp heat (steady state)
56 days; 40 °C; 90 % to 95 % RH;
loaded with 0.01 P70
(IEC steps: 0 V to 100 V)
Rins min. 103 M
R max.: ± (1 % 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.: ± (1 % R + 0.05 )
4.25.3 Endurance at upper
category temperature 1000 h; no load R max.: ± (1 % R + 0.05 )
4.8 Temperature coefficient
Between -55 °C and +155 °C
0.22 R 4.7
4.7 < R 15
15 < R 15 k
± 200 ppm/K
± 200 ppm/K
± 100 ppm/K
± 200 ppm/K
± 100 ppm/K
± 100 ppm/K
4.12 Noise IEC 60195 < 0.1 μV/V
4.26 Accidental overload Cheese-cloth Non flammable
4.6.1.1 Insulation resistance Maximum voltage Umax. DC = 500 V
after 1 min; metal block method Rins min. 104 M
NFR25, NFR25H
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12NC INFORMATION FOR HISTORICAL CODING REFERENCE
• The resistors have a 12 digit numeric code starting with 23
• The subsequent 7 digits indicate the resistor type and
packaging
• The remaining 3 digits indicate the resistance value:
- The first 2 digits indicate the resistance value
- The last digit indicates the resistance decade
Last Digit of 12NC Indicating Resistance Decade
12NC Example
The 12NC of a NFR25 resistor with value 750 , supplied on
a bandolier of 1000 units in ammopack is: 2322 205 13751.
RESISTANCE DECADE LAST DIGIT
0.22 to 0.91 7
1 to 9.1 8
10 to 91 9
100 to 910 1
1 k to 9.1 k2
10 k to 15 k3
12NC (Resistors Type and Packaging)
TYPE
23.. ... .....
BANDOLIER IN AMMOPACK BANDOLIER ON REEL
RADIAL TAPED STRAIGHT LEADS STRAIGHT LEADS
2000 UNITS 1000 UNITS 5000 UNITS 5000 UNITS
NFR25 22 204 03... 22 205 13... 22 205 33... 22 205 23...
NFR25H 22 207 03... 22 207 13... 22 207 33... 22 207 23...
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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