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Philips Components
Product specification
Fusible resistors
FEATURES * Overload protection without risk of fire * Wide range of overload currents. APPLICATIONS * Audio * Video. 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 encapsulation is resistant to all cleaning solvents in accordance with "MIL-STD-202E, method 215", and "IEC 60068-2-45".. ORDERING INFORMATION Ordering code (12NC) * The resistors have a 12-digit ordering code starting with 23 * The subsequent 7 digits indicate the resistor type and packaging; see Table 1. * The remaining 3 digits indicate the resistance values: - The first 2 digits indicate the resistance value. - The last digit indicates the resistance decade in accordance with Table 2. NFR25 NFR25H Table 2 TYPE RADIAL TAPED 4000 units 06 204 03... 06 207 03... Last digit of 12NC LAST DIGIT 8 9 1 2 3 STRAIGHT LEADS 1000 units 22 205 13... 22 207 13... QUICK REFERENCE DATA
NFR25/25H
VALUE DESCRIPTION NFR25 Resistance range Resistance tolerance and series Maximum dissipation at Tamb = 70 C Thermal resistance (Rth) Temperature coefficient: 1 R 4.7 4.7 < R 15 15 < R 15 k Maximum permissible voltage (DC or RMS) Basic specifications Climatic category (IEC 60068) Stability after: load climatic tests soldering Table 1 R/R max.: 1% + 0.05 R/R max.: 1% + 0.05 R/R max.: 0.25% + 0.05 200 x 10-6/K 200 x 10-6/K 100 x 10-6/K 250 V 200 x 10-6/K 100 x 10-6/K 100 x 10-6/K 350 V NFR25H 1 to 15 k 5%; E24 series 0.33 W 240 K/W 0.5 W 150 K/W
IEC 60115-1 and 60115-2 55/155/56
Ordering code indicating resistor type and packaging ORDERING CODE 23.. ... ..... BANDOLIER IN AMMOPACK BANDOLIER ON REEL STRAIGHT LEADS 5000 units 22 205 23... 22 207 23...
5000 units 22 205 33... 22 207 33...
ORDERING EXAMPLE The ordering code for a NFR25 resistor with value 750 , supplied on a bandolier of 1000 units in ammopack is: 2322 205 13751.
RESISTANCE DECADE 1 to 9.1 10 to 91 100 to 910 1 to 9.1 k 10 to 15 k
1998 Aug 28
1
Philips Components
Product specification
Fusible resistors
FUNCTIONAL DESCRIPTION Product characterization
NFR25/25H
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 publication 60063". Limiting values TYPE NFR25 NFR25H Note 1. The maximum voltage that may be continuously applied to the resistor element, see "IEC publication 60115-1". The maximum permissible hot-spot temperature is 155 C. DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.1. LIMITING VOLTAGE(1) (V) 250 350 LIMITING POWER (W) 0.33 0.5
handbook, 4 columns Pmax (%Prated)
CCB412
100
50
0 -55
0
50
70
100
155 Tamb (C)
Fig.1 Maximum dissipation (Pmax) in percentage of rated power as a function of the ambient temperature (Tamb).
1998 Aug 28
2
Philips Components
Product specification
Fusible resistors
FUSING CHARACTERISTIC
NFR25/25H
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; see Figs 2, 3 and 4. The fusing characteristic is measured under constant voltage.
10 3 handbook, halfpage t (s) 10 2
10
1
10 -1
0
NFR25 This graph is based on measured data which may deviate according to the application.
,,,, ,,,, ,,,, ,,,, ,,,, ,,,, ,,,, ,,,,
4 8
MEA674
10 3 handbook, halfpage t (s) 10 2
MEA675
10
1
P overload (W)
12
10 -1
0
,,,,, ,,,,, ,,,,, ,,,,, ,,,,,
4 8
12 P overload (W)
NFR25 This graph is based on measured data which may deviate according to the application.
Fig.2 Fusing characteristic: 1 R 15 .
Fig.3 Fusing characteristic: 15 < R 15 k.
103 handbook, halfpage t (s) 102
10
1
,,,,, ,,,,, ,,,,, ,,,,, ,,,,, ,,,,,
4 8 12 16
CCA981
10-1
0
20 24 Poverload (W)
NFR25H This graph is based on measured data which may deviate according to the application.
Fig.4 Fusing characteristic.
1998 Aug 28
3
Philips Components
Product specification
Fusible resistors
PULSE LOADING CAPABILITIES
103 handbook, full pagewidth P max (W) 102
NFR25/25H
MBG610
tp/ti = 1000 10
500 200 100 50 20 10
1
5 2
10-1 10-6
10-5
10-4
10-3
10-2
10-1
ti (s)
1
NFR25
Fig.5
Pulse on a regular basis; maximum permissible peak pulse power ( P max ) as a function of pulse duration (ti), 1 R < 15 .
103 handbook, full pagewidth P max (W) 102
MBG611
10 tp/ti = 1000
100 1 20 2
10-1 10-6
10-5
10-4
10-3
10-2
10-1
ti (s)
1
NFR25
Fig.6
Pulse on a regular basis; maximum permissible peak pulse power ( P max ) as a function of pulse duration (ti), 15 < R 15 k. 4
1998 Aug 28
Philips Components
Product specification
Fusible resistors
NFR25/25H
handbook, full pagewidth
600
MEA678
V max (V) 500
400
300
200
100
0 10 6 NFR25
10 5
10 4
10 3
10 2
10 1
t i (s)
1
Fig.7
Pulse on a regular basis; maximum permissible peak pulse voltage ( V max ) as a function of pulse duration (ti).
10 3 handbook, full pagewidth Pmax (W) 10 2 t p /t i = 1000 500 200 100 50 10 20 10 5 1 2
MLB653
10 1 10 6 NFR25H
10 5
10 4
10 3
10 2
10 1
t i (s)
1
Fig.8
Pulse on a regular basis; maximum permissible peak pulse power ( P max ) as a function of pulse duration (ti). 5
1998 Aug 28
Philips Components
Product specification
Fusible resistors
NFR25/25H
handbook, full pagewidth
1200
MGB738
Vmax (V)
800
400
0 10-6
10-5
10-4
10-3
10-2
10-1
ti (s)
1
NFR25H
Fig.9
Pulse on a regular basis; maximum permissible peak pulse voltage ( V max ) as a function of pulse duration (ti).
1998 Aug 28
6
Philips Components
Product specification
Fusible resistors
Application information
MGB741
NFR25/25H
handbook, halfpage
100
handbook, halfpage
50
MGB742
T (K)
T (K)
80
40 5 mm
60
30
10 mm 15 mm
40
20
20
10
0 0 0.2 0.4 P (W) 0.6
0 0 0.2 0.4 P (W) 0.6
NFR25
NFR25 Minimum distance from resistor body to PCB = 1 mm.
Fig.10 Hot-spot temperature rise (T) as a function of dissipated power.
Fig.11 Temperature rise (T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.
handbook, halfpage
100
MGB739
T (K)
handbook, halfpage
50
MGB740
T (K)
5 mm 10 mm
80
40
60
30 15 mm
40
20
20
10
0 0 0.2 0.4 P (W) 0.6
0 0 0.2 0.4 P (W) 0.6
NFR25H
NFR25H Minimum distance from resistor body to PCB = 1 mm.
Fig.12 Hot-spot temperature rise (T) as a function of dissipated power.
Fig.13 Temperature rise (T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.
1998 Aug 28
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Philips Components
Product specification
Fusible resistors
MECHANICAL DATA Mass per 100 units
L1
NFR25/25H
TYPE NFR25 NFR25H Marking
MASS (g)
handbook, 4 columns
d
CCB414
25
D L2
The nominal resistance and tolerance are marked on the resistor using four coloured bands in accordance with IEC publication 60062 "Colour codes for fixed resistors". 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 publication 60294").
For dimensions see Table 3.
Fig.14 Outline.
Table 3
Resistor type and relevant physical dimensions; see Fig.14 D MAX. (mm) 2.5 L1 MAX. (mm) 6.5 L2 MAX. (mm) 7.5 d (mm) 0.58 0.05
TYPE NFR25 NFR25H
1998 Aug 28
8
Philips Components
Product specification
Fusible resistors
TESTS AND REQUIREMENTS Essentially all tests are carried out in accordance with the schedule of "IEC publication 60115-1", category LCT/UCT/56 (rated temperature range: Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days). The testing also covers the requirements specified by EIA and EIAJ. The tests are carried out in accordance with IEC publication 60068, "Recommended basic climatic and mechanical robustness testing procedure for electronic components" and under standard atmospheric conditions according to "IEC 60068-1", subclause 5.3.
NFR25/25H
Unless otherwise specified the following values apply: Temperature: 15 C to 35 C Relative humidity: 45% to 75% Air pressure: 86 kPa to 106 kPa. In Table 4 the tests and requirements are listed with reference to the relevant clauses of "IEC publications 60115-1 and 60068"; 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" and to "EN 140000, appendix D". All soldering tests are performed with mildly activated flux.
Table 4
Test procedures and requirements IEC 60068-2 TEST METHOD REQUIREMENTS TEST PROCEDURE NFR25 NFR25H
IEC 60115-1 CLAUSE
Tests in accordance with the schedule of IEC publication 60115-8 4.4.1 4.4.2 4.5 visual examination dimensions (outline) resistance gauge (mm) applied voltage (+0/-10%): R < 10 : 0.1 V 10 R < 100 : 0.3 V 100 R < 1 k: 1 V 1 k R < 10 k: 3 V 10 k R 15 k: 10 V 4.18 4.29 Tb 45 (Xa) resistance to soldering heat component solvent resistance solderability voltage proof on insulation U Ua Ub Uc robustness of terminations: tensile all samples load 10 N; 10 s number of failures <10 x 10-6 number of failures <10 x 10-6 no damage R/R max.: 0.25% + 0.05 bending half load 5 N; 4 x 90 number of samples torsion other half of samples 3 x 360 in opposite directions thermal shock: 3 s; 350 C; 6 mm from body isopropyl alcohol or H2O followed by brushing in accordance with "MIL 202 F" 2 s; 235 C 2 x maximum voltage (RMS) during 1 minute; metal block method R/R max.: 0.25% + 0.05 no visual damage no holes; clean surface; no damage see Table 3 R - Rnom: max. 5%
4.17 4.7
Ta
good tinning; no damage no breakdown or flashover
4.16 4.16.2 4.16.3 4.16.4
1998 Aug 28
9
Philips Components
Product specification
Fusible resistors
NFR25/25H
IEC 60115-1 CLAUSE 4.20 4.22
IEC 60068-2 TEST METHOD Eb Fc bump
REQUIREMENTS TEST PROCEDURE NFR25 3 x 1500 bumps in 3 directions; 40 g frequency 10 to 500 Hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 hours (3 x 2 hours) 30 minutes at LCT and 30 minutes at UCT; 5 cycles NFR25H
no damage R/R max.: 0.25% + 0.05 no damage R/R max.: 0.25% + 0.05
vibration
4.19 4.23 4.23.3
14 (Na)
rapid change of temperature climatic sequence: damp heat (accelerated) 1st cycle damp heat (accelerated) remaining cycles damp heat (steady state) (IEC) endurance (at 70 C)
no visual damage R/R max.: 0.25% + 0.05
30 (D)
4.23.6
30 (D)
6 days; 55 C; 95 to 98% RH
Rins min.: 103 M R/R max.: 1% + 0.05
4.24.2
3 (Ca)
56 days; 40 C; 90 to 95% RH; loaded with 0.01 Pn (IEC steps: 4 to 100 V) 1000 hours; loaded with Pn or Vmax; 1.5 hours on and 0.5 hours off
Rins max.: 1000 M R/R max.: 1% + 0.05 R/R max.: 1% + 0.05
4.25.1
4.23.2 4.8.4.2
27 (Ba)
endurance at upper 1000 hours; category temperature no load temperature coefficient at 20/LCT/20 C and 20/UCT/20 C (TC x 10-6/K): 1 R 4.7 4.7 < R 15 15 < R 15 k
R/R max.: 1% + 0.05
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
4.12 4.26
noise accidental overload
"IEC publication 60195"
cheese-cloth
<0.1 V/V nonflammable
Other tests in accordance with IEC 60115 clauses and IEC 60068 test method 4.17 20 (Tb) solderability (after ageing) 8 hours steam or 16 hours 155 C; leads immersed 6 mm for 2 0.5 s in a solder bath at 235 5 C maximum voltage 500 V (DC) after 1 minute; metal block method good tinning (95% covered); no damage
4.6.1.1
insulation resistance
Rins min.: 104 M
see 2nd amendment to "IEC 60115-1", Jan.'87
pulse load
see Figs 5, 6, 7, 8 and 9
1998 Aug 28
10

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