Philips Components Product specification Fusible resistors FEATURES NFR25/25H QUICK REFERENCE DATA • 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”.. VALUE DESCRIPTION NFR25 NFR25H 1 Ω to 15 kΩ Resistance range ±5%; E24 series Resistance tolerance and series Maximum dissipation at Tamb = 70 °C 0.33 W 0.5 W 240 K/W 150 K/W 1 Ω ≤ R ≤ 4.7 Ω ≤±200 × 10−6/K ≤±200 × 10−6/K 4.7 Ω < R ≤ 15 Ω ≤±200 × 10−6/K ≤±100 × 10−6/K 15 Ω < R ≤ 15 kΩ 10−6/K ≤±100 × 10−6/K Thermal resistance (Rth) Temperature coefficient: ≤±100 × Maximum permissible voltage (DC or RMS) 250 V Basic specifications 350 V IEC 60115-1 and 60115-2 Climatic category (IEC 60068) 55/155/56 Stability after: load ∆R/R max.: ±1% + 0.05 Ω climatic tests ∆R/R max.: ±1% + 0.05 Ω soldering ∆R/R max.: ±0.25% + 0.05 Ω Table 1 Ordering code indicating resistor type and packaging ORDERING CODE 23.. ... ..... ORDERING INFORMATION Ordering code (12NC) BANDOLIER IN AMMOPACK TYPE RADIAL TAPED • 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. 1998 Aug 28 BANDOLIER ON REEL STRAIGHT LEADS STRAIGHT LEADS 4000 units 1000 units 5000 units 5000 units NFR25 06 204 03... 22 205 13... 22 205 33... 22 205 23... NFR25H 06 207 03... 22 207 13... 22 207 33... 22 207 23... Table 2 Last digit of 12NC RESISTANCE DECADE LAST DIGIT 1 to 9.1 Ω 8 10 to 91 Ω 9 100 to 910 Ω 1 1 to 9.1 kΩ 2 10 to 15 kΩ 3 1 ORDERING EXAMPLE The ordering code for a NFR25 resistor with value 750 Ω, supplied on a bandolier of 1000 units in ammopack is: 2322 205 13751. Philips Components Product specification Fusible resistors NFR25/25H FUNCTIONAL DESCRIPTION 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 publication 60063”. Limiting values LIMITING VOLTAGE(1) (V) LIMITING POWER (W) NFR25 250 0.33 NFR25H 350 0.5 TYPE 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. CCB412 handbook, 4 columns Pmax (%Prated) 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 NFR25/25H FUSING CHARACTERISTIC 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 4 8 MEA674 t (s) 10 2 10 1 P overload (W) 10 –1 12 Fig.2 Fusing characteristic: 1 Ω ≤ R ≤ 15 Ω. t (s) 102 10 1 10−1 0 CCA981 8 12 16 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 4 8 12 P overload (W) Fig.3 Fusing characteristic: 15 Ω < R ≤ 15 kΩ. ,,,,, ,,,,, ,,,,, ,,,,, ,,,,, ,,,,, 4 0 ,,,,, ,,,,, ,,,,, ,,,,, ,,,,, NFR25 This graph is based on measured data which may deviate according to the application. NFR25 This graph is based on measured data which may deviate according to the application. 3 10halfpage handbook, MEA675 10 3 handbook, halfpage 3 Philips Components Product specification Fusible resistors NFR25/25H PULSE LOADING CAPABILITIES MBG610 103 handbook, full pagewidth P max (W) 102 tp/ti = 1000 500 200 100 10 50 20 10 5 1 2 10−1 10−6 10−5 10−4 10−3 10−2 10−1 ti (s) 1 NFR25 Fig.5 ˆ max ) Pulse on a regular basis; maximum permissible peak pulse power ( P as a function of pulse duration (ti), 1 Ω ≤ R < 15 Ω. MBG611 103 handbook, full pagewidth P max (W) 102 10 tp/ti = 1000 100 1 20 2 10−1 10−6 10−5 10−4 10−3 10−2 10−1 NFR25 Fig.6 1998 Aug 28 ˆ max ) Pulse on a regular basis; maximum permissible peak pulse power ( P as a function of pulse duration (ti), 15 Ω < R ≤ 15 kΩ. 4 ti (s) 1 Philips Components Product specification Fusible resistors NFR25/25H MEA678 600 handbook, full pagewidth V max (V) 500 400 300 200 100 0 10 6 10 5 10 4 10 3 10 2 10 1 1 t i (s) NFR25 Fig.7 ˆ max ) Pulse on a regular basis; maximum permissible peak pulse voltage ( V as a function of pulse duration (ti). MLB653 10 3 handbook, full pagewidth Pmax (W) t p /t i = 1000 500 10 2 200 100 50 20 10 10 5 2 1 10 1 10 6 10 5 10 4 10 3 10 2 10 1 NFR25H Fig.8 1998 Aug 28 ˆ max ) Pulse on a regular basis; maximum permissible peak pulse power ( P as a function of pulse duration (ti). 5 t i (s) 1 Philips Components Product specification Fusible resistors NFR25/25H MGB738 1200 handbook, full pagewidth Vmax (V) 800 400 0 10−6 10−5 10−4 10−3 10−2 10−1 NFR25H Fig.9 1998 Aug 28 ˆ max ) Pulse on a regular basis; maximum permissible peak pulse voltage ( V as a function of pulse duration (ti). 6 ti (s) 1 Philips Components Product specification Fusible resistors NFR25/25H Application information MGB741 100 MGB742 50 handbook, halfpage handbook, halfpage ∆T (K) ∆T (K) 80 40 60 30 40 20 20 10 5 mm 10 mm 15 mm 0 0 0 0.2 0.4 P (W) 0 0.6 0.2 0.4 P (W) 0.6 NFR25 Minimum distance from resistor body to PCB = 1 mm. NFR25 Fig.11 Temperature rise (∆T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting. Fig.10 Hot-spot temperature rise (∆T) as a function of dissipated power. MGB739 100 MGB740 50 handbook, halfpage handbook, halfpage ∆T (K) ∆T (K) 80 5 mm 40 10 mm 60 30 15 mm 40 20 20 10 0 0 0 0.2 0.4 P (W) 0.6 0 NFR25H 0.4 P (W) 0.6 NFR25H Minimum distance from resistor body to PCB = 1 mm. Fig.13 Temperature rise (∆T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting. Fig.12 Hot-spot temperature rise (∆T) as a function of dissipated power. 1998 Aug 28 0.2 7 Philips Components Product specification Fusible resistors NFR25/25H MECHANICAL DATA Mass per 100 units L1 TYPE MASS (g) handbook, 4 columns NFR25 NFR25H ∅d 25 CCB414 ∅D L2 Marking 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”). 1998 Aug 28 For dimensions see Table 3. Fig.14 Outline. Table 3 Resistor type and relevant physical dimensions; see Fig.14 TYPE NFR25 NFR25H 8 ∅D MAX. (mm) L1 MAX. (mm) L2 MAX. (mm) ∅d (mm) 2.5 6.5 7.5 0.58 ±0.05 Philips Components Product specification Fusible resistors NFR25/25H Unless otherwise specified the following values apply: TESTS AND REQUIREMENTS Temperature: 15 °C to 35 °C 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. 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”. 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. All soldering tests are performed with mildly activated flux. Table 4 Test procedures and requirements IEC 60115-1 CLAUSE IEC 60068-2 TEST METHOD REQUIREMENTS TEST PROCEDURE NFR25 NFR25H Tests in accordance with the schedule of IEC publication 60115-8 4.4.1 visual examination no holes; clean surface; no damage 4.4.2 dimensions (outline) gauge (mm) 4.5 resistance applied voltage (+0/−10%): see Table 3 R − Rnom: max. ±5% R < 10 Ω: 0.1 V 10 Ω ≤ R < 100 Ω: 0.3 V 100 Ω ≤ R < 1 kΩ: 1 V 1 kΩ ≤ R < 10 kΩ: 3 V 10 kΩ ≤ R ≤ 15 kΩ: 10 V 4.18 Tb resistance to soldering heat thermal shock: 3 s; 350 °C; 6 mm from body 4.29 45 (Xa) component solvent resistance isopropyl alcohol or H2O followed by brushing in accordance with “MIL 202 F ” 4.17 Ta solderability 2 s; 235 °C voltage proof on insulation 2 × maximum voltage (RMS) during 1 minute; metal block method 4.7 4.16 U 4.16.2 Ua tensile all samples 4.16.3 Ub bending half load 5 N; 4 × 90° number of samples 4.16.4 Uc torsion other half of samples 1998 Aug 28 ∆R/R max.: ±0.25% + 0.05 Ω no visual damage good tinning; no damage no breakdown or flashover robustness of terminations: load 10 N; 10 s 3 × 360° in opposite directions 9 number of failures <10 × 10−6 number of failures <10 × 10−6 no damage ∆R/R max.: ±0.25% + 0.05 Ω Philips Components Product specification Fusible resistors NFR25/25H IEC 60115-1 CLAUSE IEC 60068-2 TEST METHOD 4.20 Eb bump 3 × 1500 bumps in 3 directions; 40 g no damage ∆R/R max.: ±0.25% + 0.05 Ω 4.22 Fc vibration frequency 10 to 500 Hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 hours (3 × 2 hours) no damage ∆R/R max.: ±0.25% + 0.05 Ω 4.19 14 (Na) rapid change of temperature 30 minutes at LCT and 30 minutes at UCT; 5 cycles no visual damage ∆R/R max.: ±0.25% + 0.05 Ω 6 days; 55 °C; 95 to 98% RH Rins min.: 103 MΩ 4.23 REQUIREMENTS TEST NFR25 30 (D) damp heat (accelerated) 1st cycle 4.23.6 30 (D) damp heat (accelerated) remaining cycles 3 (Ca) 4.25.1 4.23.2 NFR25H climatic sequence: 4.23.3 4.24.2 PROCEDURE 27 (Ba) 4.8.4.2 ∆R/R max.: ±1% + 0.05 Ω damp heat (steady state) (IEC) 56 days; 40 °C; 90 to 95% RH; loaded with 0.01 Pn (IEC steps: 4 to 100 V) endurance (at 70 °C) 1000 hours; loaded with Pn or Vmax; 1.5 hours on and 0.5 hours off Rins max.: 1000 MΩ ∆R/R max.: ±1% + 0.05 Ω ∆R/R max.: ±1% + 0.05 Ω ∆R/R max.: ±1% + 0.05 Ω endurance at upper 1000 hours; category temperature no load temperature coefficient at 20/LCT/20 °C and 20/UCT/20 °C (TC × 10−6/K): 1 Ω ≤ R ≤ 4.7 Ω ≤±200 × 10−6/K ≤±200 × 10−6/K 4.7 Ω < R ≤ 15 Ω ≤±200 × 10−6/K ≤±100 × 10−6/K 15 Ω < R ≤ 15 kΩ ≤±100 × 10−6/K ≤±100 × 10−6/K 4.12 noise “IEC publication 60195” 4.26 accidental overload cheese-cloth <0.1 µV/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 good tinning (≥95% covered); no damage 4.6.1.1 insulation resistance maximum voltage 500 V (DC) after 1 minute; metal block method Rins min.: 104 MΩ see 2nd amendment to “IEC 60115-1”, Jan.’87 pulse load 1998 Aug 28 see Figs 5, 6, 7, 8 and 9 10