NFR25, NFR25H
Vishay BCcomponents
Fusible, Non-Flammable Metal Film Leaded Resistors
FEATURES
• Technology: Metal film
• Overload protection without risk of fire
• Wide range of overload currents (refer Fusing
Characteristics graphs)
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 grey, 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.
• Lead (Pb)-free solder contacts
• Pure tin plating provides compatibility with lead (Pb)-free
and lead containing soldering processes
• Compatible to RoHS directive 2002/95/EC
APPLICATIONS
• Audio
• Video
TECHNICAL SPECIFICATIONS
DESCRIPTION
Resistance Range
(1)
Resistance Tolerance
Resistance Series
Rated Dissipation,
P
70
Thermal Resistance (R
th
)
Temperature Coefficient
0.22
Ω ≤
R
≤
4.7
Ω
ppm/K
4.7
Ω <
R
≤
15
Ω
15
Ω <
R
≤
15 kΩ
Operating Voltage,
U
max.
DC or RMS
Basic Specifications
Climatic Category (IEC 60068-1)
Max. Resistance Change for Resistance Range,
ΔR
max., after:
Load (1000 h,
P
70
):
Long Term Damp Heat Test (56 Days):
Soldering (260 °C, 10 s):
± (1 %
R
+ 0.05
Ω)
± (1 %
R
+ 0.05
Ω)
± (0.25 %
R
+ 0.05
Ω)
± (1 %
R
+ 0.05
Ω)
± (1 %
R
+ 0.05
Ω)
± (0.25 %
R
+ 0.05
Ω)
V
≤
± 200
≤
± 100
250
IEC 60 115-1
55/155/56
≤
± 100
≤
± 100
350
IEC 60 115-1
55/155/56
≤
± 200
≤
± 200
W
K/W
UNIT
Ω
%
NFR25
0.22 to 15k
±5
E24
0.33
240
NFR25H
0.22 to 15k
±5
E24
0.5
150
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
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1
For technical questions, contact:
filmresistorsleaded@vishay.com
Document Number: 28737
Revision: 30-Mar-10
NFR25, NFR25H
Fusible, Non-Flammable Metal Film
Leaded Resistors
PACKAGING
AMMOPACK
MODEL
TAPING
PIECES
5000
NFR25, NFR25H
NFR25, NFR25H
Axial, 52 mm
1000
Radial
4000
A1
N4
-
-
CODE
A5
5000
R5
PIECES
CODE
REEL
Vishay BCcomponents
DIMENSIONS
L
1
Ø
d
ØD
L
2
Outline
DIMENSIONS
(Resistor Types, Mass and Relevant Physical Dimensions)
TYPE
NFR25
2.5
NFR25H
6.5
7.5
0.58 ± 0.05
201
D
max.
(mm)
L
1 max.
(mm)
L
2 max.
(mm)
Ød
(mm)
MASS
(mg)
PART NUMBER AND PRODUCT DESCRIPTION
PART NUMBER: NFR2500002207JA100
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 overload
(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
• The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products
(1)
Please refer packaging table
Document Number: 28737
Revision: 30-Mar-10
For technical questions, contact:
filmresistorsleaded@vishay.com
www.vishay.com
2
NFR25, NFR25H
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
29.0
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
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.
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).
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:
filmresistorsleaded@vishay.com
Document Number: 28737
Revision: 30-Mar-10
NFR25, NFR25H
Fusible, Non-Flammable Metal Film
Leaded Resistors
DERATING
The power that the resistor can dissipate depends on the operating temperature.
P
max.
(%
P
rated
)
100
Vishay BCcomponents
50
0
- 55
0
50
70
100
T
amb
(°C)
155
Maximum dissipation (P
max.
) in percentage of rated power as a function of the ambient temperature (T
amb
)
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.
10
3
t
(s)
10
2
10
3
t
(s)
10
2
10
10
1
1
10
-1
0
4
8
12
16
24
P
overload
(W)
20
10
-1
0
2
4
6
8
10
12
P
overload
(W)
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
NFR25
This graph is based on measured data
which may deviate according to the application.
Fusing Characteristics: 1
Ω ≤
R
≤
15
Ω
10
1
10
-1
0
2
4
6
8
10
12
P
overload
(W)
NFR25
This graph is based on measured data which may deviate according to the application.
Fusing Characteristics: 15
Ω ≤
R
≤
15 kΩ
Document Number: 28737
Revision: 30-Mar-10
For technical questions, contact:
filmresistorsleaded@vishay.com
www.vishay.com
4
NFR25, NFR25H
Vishay BCcomponents
FUSING CHARACTERISTICS
10
3
t
(s)
10
2
10
3
t
(s)
10
2
Fusible, Non-Flammable Metal Film
Leaded Resistors
10
10
1
1
10
-1
0
4
8
12
16
24
P
overload
(W)
20
10
-1
0
4
8
12
16
20
24
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
PULSE LOADING CAPABILITIES
10
3
ˆ
P
max.
(W)
10
2
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
ˆ
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
ˆ
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
ˆ
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
www.vishay.com
5
For technical questions, contact:
filmresistorsleaded@vishay.com
Document Number: 28737
Revision: 30-Mar-10
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