NFR25/25H
Vishay BCcomponents
Fusible, Non-Flammable Metal Film Leaded Resistors
FEATURES
• Overload protection without risk of fire
• Wide range of overload currents
(refer Fusing Characteristics graphs)
• Lead (Pb)-free solder contacts
A homogenous 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 grey, flame retardant lacquer which provides
electrical, mechanical, and climatic protection. The
encapsulation is resistant to all cleaning solvents in
accordance with IEC 60068-2-45.
• Pure tin plating provides compatibility with
lead (Pb)-free and lead containing soldering processes
• Compliant to RoHS directive 2002/95/EC
APPLICATIONS
•
Audio
•
Video
TECHNICAL SPECIFICATIONS
VALUE
DESCRIPTION
NFR25
Resistance Range
(1)
Resistance Tolerance and Series
Rated Dissipation,
P
70
Thermal Resistance
R
th
Temperature Coefficient:
0.22
Ω ≤
R
≤
4.7
Ω
4.7
Ω
<
R
≤
15
Ω
15
Ω
<
R
≤
15 kΩ
Maximum Permissible Voltage,
U
max.
(DC or RMS)
Basic Specifications
Climatic Category (IEC 60068-1)
Stability After:
Load (1000 h,
P
70
):
Long Term Damp Heat Test (56 Days)
Soldering (10 s, 260 °C)
ΔR
max.: ± (1 %
R
+ 0.05
Ω)
ΔR
max.: ± (1 %
R
+ 0.05
Ω)
ΔR
max.: ± (0.25 %
R
+ 0.05
Ω)
≤
± 200 ppm/K
≤
± 200 ppm/K
≤
± 100 ppm/K
250 V
IEC 60115-1
55/155/56
≤
± 200 ppm/K
≤
± 100 ppm/K
≤
± 100 ppm/K
350 V
0.33 W
240 K/W
0.22
Ω
to 15 kΩ
± 5 %; E24 series
0.5 W
150 K/W
NFR25H
Notes
(1)
Ohmic values (other than resistance range) are available on request
•
R
value is measured with probe distance of 24 mm ± 1 mm using 4-terminal method
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Document Number: 28737
Revision: 05-Oct-09
NFR25/25H
Fusible, Non-Flammable Metal Film
Leaded Resistors
PART NUMBER AND PRODUCT DESCRIPTION
PART NUMBER: NFR2500002207JA100
Vishay BCcomponents
N
MODEL/SIZE
NFR2500
NFR25H0
F
R
2
5
0
0
0
0
2
2
0
7
J
A
1
0
0
SPECIAL
The 2 digits
are used for
all special
parts.
00
= Standard
VARIANT
0
= Neutral
Z
= Value overflow
(Special)
TCR/MATERIAL
0
= Standard
VALUE
3 digit value
1 digit multiplier
MULTIPLIER
7
= *10
-3
8
= *10
-2
9
= *10
-1
0
= *10
0
1
= *10
1
2
= *10
2
TOLERANCE
J
=±5%
PACKAGING
(1)
N4
A5
A1
R5
PRODUCT DESCRIPTION: NFR25 5 % A1 R22
NFR25
MODEL/SIZE
NFR25
NFR25H
5%
TOLERANCE
±
5
%
A1
PACKAGING
(1)
N4
A5
A1
R5
R22
RESISTANCE VALUE
1K0
= 1 kΩ
4R7
= 4.7
Ω
Notes
(1)
Please refer to table PACKAGING for details
• The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products
PACKAGING
AMMO PACK
MODEL
TAPING
PIECES
5000
NFR25, NFR25H
NFR25, NFR25H
Axial, 52 mm
1000
Radial
4000
A1
N4
-
-
CODE
A5
5000
R5
PIECES
CODE
REEL
DIMENSIONS
L
1
Ø
d
Ø
D
L
2
Outline
DIMENSIONS
- Resistor types and relevant physical dimensions
TYPE
NFR25
2.5
NFR25H
6.5
7.5
0.58 ± 0.05
Ø D
max.
L
1 max.
L
2 max.
Ød
Document Number: 28737
Revision: 05-Oct-09
For technical questions, contact:
filmresistorsleaded@vishay.com
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127
NFR25/25H
Vishay BCcomponents
Fusible, Non-Flammable Metal Film
Leaded Resistors
PRODUCTS WITH RADIAL LEADS (NFR25, NFR25H)
P
2
P
H
1
H
H
0
L
1
L
W
0
W
F
P
0
P
1
D
0
DIMENSIONS - RADIAL TAPING
SYMBOL
P
P
0
P
1
P
2
F
W
W
0
H
1
H
0
H
D
0
L
L
1
PARAMETER
Pitch of components
Feed-hole pitch
Feed-hole centre to lead at topside at the tape
Feed-hole center to body center
Lead-to-lead distance
Tape width
Minimum hold down tape width
Component height
Lead wire clinch height
Height of component from tape center
Feed-hole diameter
Maximum length of snipped lead
Minimum lead wire (tape portion) shortest lead
VALUE
12.7
12.7
3.85
6.35
4.8
18.0
5.5
29
16.5
19.5
4.0
11.0
2.5
TOLERANCE
± 1.0
± 0.2
± 0.5
± 1.0
+ 0.7/- 0
± 0.5
-
Max.
± 0.5
±1
± 0.2
-
-
UNIT
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Note
• Please refer document number 28721 “Packaging” for more detail
MASS PER UNIT
TYPE
NFR25
NFR25H
MASS
(mg)
201
201
OUTLINES
The length of the body (L
1
) 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 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.
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.
LIMITING VALUES
TYPE
NFR25
NFR25H
LIMITING VOLTAGE
U
(1)
(V)
250
350
LIMITING POWER
P
70
(W)
0.33
0.5
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.
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For technical questions, contact:
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Document Number: 28737
Revision: 05-Oct-09
NFR25/25H
Fusible, Non-Flammable Metal Film
Leaded Resistors
The power that the resistor can dissipate depends on the operating
temperature.
Vishay BCcomponents
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.
10
3
P
max.
(%P
rated
)
100
t
(s)
10
2
50
10
1
0
- 55
0
50
70
100
155
T
amb
(
°C)
10
-1
Maximum dissipation (P
max.
) in percentage of rated power as a
function of the ambient temperature (T
amb
)
0
4
8
12
16
20
24
P
overload
(W)
Derating
10
3
NFR25
This graph is based on measured data which may deviate
according to the application. Fusing Characteristics:
≤
1
Ω
10
3
t
(s)
10
2
t
(s)
10
2
10
10
1
1
10
-1
0
4
8
P
overload
(W)
12
10
-1
0
4
8
P
overload
(W)
12
NFR25
This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1
Ω ≤
R
≤
15
Ω
10
3
NFR25
This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 15
Ω ≤
R
≤
15 kΩ
10
3
t
(s)
10
2
t
(s)
10
2
10
10
1
1
10
-1
0
4
8
12
16
20
24
10
-1
0
4
8
12
16
20
24
P
overload
(W)
P
overload
(W)
NFR25H
This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics:
≤
1
Ω
NFR25H
This graph is based on measured data
which may deviate according to the application.
Fusing Characteristic: 1
Ω ≤
R
≤
15 kΩ
Fusing Characteristics
Document Number: 28737
Revision: 05-Oct-09
For technical questions, contact:
filmresistorsleaded@vishay.com
www.vishay.com
129
NFR25/25H
Vishay BCcomponents
10
3
P
max.
(W)
Fusible, Non-Flammable Metal Film
Leaded Resistors
10
3
t
p
/
t
i
= 1000
10
500
200
100
50
20
10
5
2
1
10
-1
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
t
i
(s)
1
NFR25
Pulse on a regular basis; maximum permissible peak pulse power (P
max.
) as a function
of pulse duration (t
i
), 0.22
Ω ≤
R
< 15
Ω
10
3
P
max.
(W)
10
2
10
t
p
/
t
i
= 1000
100
1
20
2
10
-1
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
t
i
(s)
1
NFR25
Pulse on a regular basis; maximum permissible peak pulse power (P
max.
) as a function
of pulse duration (t
i
), 15
Ω <
R
≤
15 kΩ
600
U
max.
(V)
500
400
300
200
100
0
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
t
i
(s)
1
NFR25
Pulse on a regular basis; maximum permissible peak pulse voltage
U
max.
as a function
of pulse duration (t
i
)
Pulse Loading Capabilities
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Document Number: 28737
Revision: 05-Oct-09
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