NFR25H Datasheet, PDF (1/9 Pages) Vishay Siliconix – Fusible, Non-Flammable Resistors

NFR25/25H
Vishay BCcomponents
Fusible, Non-Flammable Resistors
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 “MIL-STD-202E, method 215”, and
“IEC 60068-2-45”.
FEATURES
• 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
• Compatible with “Restriction of the use of Hazardous
Substances” (RoHS) directive 2002/95/EC (issue 2004)
APPLICATIONS
• Audio
• Video
TECHNICAL SPECIFICATIONS
DESCRIPTION
Resistance Range ⁽¹⁾
Resistance Tolerance and Series
Maximum Dissipation at T_amb = 70 °C
Thermal Resistance R_th
Temperature Coefficient:
0.22 Ω ≤ R ≤ 4.7 Ω
4.7 Ω < R ≤ 15 Ω
15 Ω < R ≤ 15 kΩ
NFR25
0.33 W
240 K/W
VALUE
0.22 Ω to 15 kΩ
± 5 %; E24 series
NFR25H
0.5 W
150 K/W
≤ ± 200 x 10^-6/K
≤ ± 200 x 10^-6/K
≤ ± 100 x 10^-6/K
≤ ± 200 x 10^-6/K
≤ ± 100 x 10^-6/K
≤ ± 100 x 10^-6/K
Maximum Permissible Voltage (DC or RMS)
250 V
350 V
Basic Specifications
Climatic Category (IEC 60068)
IEC 60115-1 and 60115-2
55/155/56
Stability After:
Load
Climatic Tests
Soldering
ΔR max.: ± (1 % R + 0.05 Ω)
ΔR max.: ± (1 % R + 0.05 Ω)
ΔR max.: ± (0.25 % R + 0.05 Ω)
Notes:
(1) _{Ohmic values (other than resistance range) are available on request}
• R value is measured with probe distance of 24 ± 1 mm using 4-terminal method
12NC INFORMATION
• 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 values:
– The first 2 digits indicate the resistance value
– The last digit indicates the resistance decade
Last Digit of 12NC Indicating Resistance Decade
RESISTANCE DECADE
0.22 to 0.91 Ω
1 to 9.1 Ω
10 to 91 Ω
100 to 910 Ω
1 to 9.1 kΩ
10 to 15 kΩ
LAST DIGIT
7
8
9
1
2
3
12NC Example
The 12NC for a NFR25 resistor with value 750 Ω, supplied
on a bandolier of 1000 units in ammopack is:
2322 205 13751.
www.vishay.com
126
For technical questions, contact: [e-mail]
Document Number: 28737
Revision: 21-Feb-08