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)
• Lead (Pb)-free solder contacts
DESCRIPTION
• Pure tin plating provides compatibility with lead (Pb)-free
and lead containing soldering processes
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.
• Compatible to RoHS directive 2002/95/EC
APPLICATIONS
• Audio
• Video
TECHNICAL SPECIFICATIONS
DESCRIPTION
UNIT
NFR25
0.22 to 15k
5
NFR25H
Resistance Range (1)
Resistance Tolerance
Resistance Series
Ω
0.22 to 15k
%
5
E24
0.5
E24
Rated Dissipation, P70
Thermal Resistance (Rth)
Temperature Coefficient
0.22 Ω ≤ R ≤ 4.7 Ω
W
0.33
K/W
240
150
≤
≤
≤
200
200
100
≤
≤
≤
200
100
100
ppm/K
V
4.7 Ω < R ≤ 15 Ω
15 Ω < R ≤ 15 kΩ
Operating Voltage, Umax. DC or RMS
Basic Specifications
Climatic Category (IEC 60068-1)
250
350
IEC 60 115-1
55/155/56
IEC 60 115-1
55/155/56
Max. Resistance Change for Resistance Range,
ΔR max., after:
Load (1000 h, P70):
(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)
Long Term Damp Heat Test (56 Days):
Soldering (260 °C, 10 s):
Notes
•
(1)
R value is measured with probe distance of 24 mm 1 mm using 4-terminal method
Ohmic values (other than resistance range) are available on request
www.vishay.com
1
For technical questions, contact: filmresistorsleaded@vishay.com
Document Number: 28737
Revision: 30-Mar-10