NFR25, NFR25H Fusible, Non-Flammable Metal Film 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 668-2-45. FEATURES Technology: Metal film 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 to RoHS directive 22/95/EC APPLICATIONS Audio Video TECHNICAL SPECIFICATIONS DESCRIPTION UNIT NFR25 NFR25H Resistance Range () Ω.22 to 5k.22 to 5k Resistance Tolerance % ± 5 ± 5 Resistance Series E24 E24 Rated Dissipation, P 7 W.33.5 Thermal Resistance (R th ) K/W 24 5 Temperature Coefficient.22 Ω R 4.7 Ω ± 2 ± 2 ppm/k 4.7 Ω < R 5 Ω ± 2 ± 5 Ω < R 5 kω ± ± Operating Voltage, U max. DC or RMS V 25 35 Basic Specifications IEC 6 5- IEC 6 5- Climatic Category (IEC 668-) 55/55/56 55/55/56 Max. Resistance Change for Resistance Range, ΔR max., after: Load ( h, P 7 ): ± ( % R +.5 Ω) ± ( % R +.5 Ω) Long Term Damp Heat Test (56 Days): ± ( % R +.5 Ω) ± ( % R +.5 Ω) Soldering (26 C, s): ± (.25 % R +.5 Ω) ± (.25 % R +.5 Ω) Notes R value is measured with probe distance of 24 mm ± mm using 4-terminal method () Ohmic values (other than resistance range) are available on request www.vishay.com For technical questions, contact: filmresistorsleaded@vishay.com Document Number: 28737 Revision: 3-Mar-
Fusible, Non-Flammable Metal Film NFR25, NFR25H PACKAGING MODEL TAPING AMMOPACK REEL PIECES CODE PIECES CODE NFR25, NFR25H Axial, 52 mm 5 A5 A 5 R5 NFR25, NFR25H Radial 4 N4 - - DIMENSIONS L Ø d Ø D L 2 Outline DIMENSIONS (Resistor Types, Mass and Relevant Physical Dimensions) TYPE D max. (mm) L max. (mm) L 2 max. (mm) Ø d (mm) MASS (mg) NFR25 NFR25H 2.5 6.5 7.5.58 ±.5 2 PART NUMBER AND PRODUCT DESCRIPTION PART NUMBER: NFR25227JA N F R 2 5 2 2 7 J A MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE PACKAGING () SPECIAL NFR25 J = ± 5 % NFR25H = Neutral Z = Value overload (Special) PRODUCT DESCRIPTION: NFR25 5 % A R22 = Standard 3 digit value digit multiplier MULTIPLIER 7 = * -3 8 = * -2 9 = * - = * = * 2 = * 2 NFR25 5 % A R22 Notes The PART NUMBER is shown to facilitate the introduction of a unified part numbering system for ordering products () Please refer packaging table N4 A5 A R5 The 2 digits are used for all special parts. = Standard MODEL/SIZE TOLERANCE PACKAGING () RESISTANCE VALUE NFR25 NFR25H ± 5 % N4 A5 A R5 K = kω 4R7 = 4.7 Ω Document Number: 28737 For technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com Revision: 3-Mar- 2
NFR25, NFR25H Fusible, Non-Flammable Metal Film PRODUCTS WITH RADIAL LEADS (NFR25, NFR25H) P 2 P H H H L L W W F P P D DIMENSIONS (Radial Taping) SYMBOL PARAMETER VALUE TOLERANCE UNIT P Pitch of components 2.7 ±. mm P Feed-hole pitch 2.7 ±.2 mm P Feed-hole centre to lead at topside at the tape 3.85 ±.5 mm P 2 Feed-hole center to body center 6.35 ±. mm F Lead-to-lead distance 4.8 +.7/- mm W Tape width 8. ±.5 mm W Minimum hold down tape width 5.5 - mm H Component height 29. Max. mm H Lead wire clinch height 6.5 ±.5 mm H Height of component from tape center 9.5 ± mm D Feed-hole diameter 4. ±.2 mm L Maximum length of snipped lead. - mm L Minimum lead wire (tape portion) shortest lead 2.5 - mm Note Please refer document number 2872 Packaging for more detail MARKING The nominal resistance and tolerance are marked on the resistor using four colored bands in accordance with IEC 662, 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 663. OUTLINES The length of the body (L ) 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 6294). LIMITING VALUES TYPE LIMITING VOLTAGE U () (V) LIMITING POWER P 7 NFR25 25.33 NFR25H 35.5 Note () The maximum voltage that may be continuously applied to the resistor element, see IEC 65-. The maximum permissible hot-spot temperature is 55 C. www.vishay.com For technical questions, contact: filmresistorsleaded@vishay.com Document Number: 28737 3 Revision: 3-Mar-
Fusible, Non-Flammable Metal Film NFR25, NFR25H DERATING The power that the resistor can dissipate depends on the operating temperature. P max. (% P rated ) 5 Maximum dissipation (P max. ) in percentage of rated power as a function of the ambient temperature (T amb ) FUSING CHARACTERISTICS - 55 7 55 T amb ( C) 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 times. The fusing characteristic is measured under constant voltage. 5 3 t 2 3 t 2-4 8 2 6 2 24 P overload NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: Ω - 2 4 6 8 2 P overload NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: Ω R 5 Ω 3 t 2-2 4 6 8 2 P overload NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: 5 Ω R 5 kω Document Number: 28737 For technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com Revision: 3-Mar- 4
NFR25, NFR25H Fusible, Non-Flammable Metal Film FUSING CHARACTERISTICS 3 t 2 3 t 2-4 8 2 6 2 24 P overload NFR25H This graph is based on measured data which may deviate according to the application. Fusing Characteristics: Ω - 4 8 2 6 2 24 P overload NFR25H This graph is based on measured data which may deviate according to the application. Fusing Characteristic: Ω R 5 kω PULSE LOADING CAPABILITIES 3 Pˆ max. 2 t p /t i = 5 2 5 2 5 2 - -6-5 -4-3 -2 - t i NFR25 Pulse on a regular basis; maximum permissible peak pulse power (Pˆ max. ) as a function of pulse duration (t i ),.22 Ω R < 5 Ω 3 Pˆ max. 2 t p /t i = 2 2-6 -5-4 -3-2 - - ti NFR25 Pulse on a regular basis; maximum permissible peak pulse power (Pˆ max. ) as a function of pulse duration (t i ), 5 Ω R 5 kω www.vishay.com For technical questions, contact: filmresistorsleaded@vishay.com Document Number: 28737 5 Revision: 3-Mar-
Fusible, Non-Flammable Metal Film NFR25, NFR25H PULSE LOADING CAPABILITIES 6 ˆ (V) 5 U max. 4 3 2-6 -5-4 -3-2 - t i NFR25 Pulse on a regular basis; maximum permissible peak pulse voltage (Uˆ max. ) as a function of pulse duration (t i ) 3 Pˆ max. 2 t p /t i = 5 2 5 2 5 2-6 -5-4 -3-2 - - ti NFR25H Pulse on a regular basis; maximum permissible peak pulse power (Pˆ max. ) as a function of pulse duration (t i ) 2 ˆ (V) U max. 8 6 4 2-6 -5-4 -3-2 - t i NFR25H Pulse on a regular basis; maximum permissible peak pulse voltage (Uˆ max. ) as a function of pulse duration (t i ) Document Number: 28737 For technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com Revision: 3-Mar- 6
NFR25, NFR25H Fusible, Non-Flammable Metal Film APPLICATION INFORMATION ΔT (K) 8 ΔT (K) 8 6 6 4 4 2 2.2.4.6 P NFR25 Hot-spot temperature rise (ΔT) as a function of dissipated power.2.4.6 P NFR25H Hot-spot temperature rise (ΔT) as a function of dissipated power 5 ΔT (K) 4 5 ΔT (K) 4 5 mm 3 2 5 mm mm 5 mm 3 2 mm 5 mm.2.4.6 P Minimum distance from resistor body to P.C.B. = mm NFR25 Temperature rise (ΔT) at thr lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.2.4.6 P Minimum distance from resistor body to P.C.B. = mm NFR25H Temperature rise (ΔT) at thr lead end (soldering point) as a function of dissipated power at various lead lengths after mounting TESTS AND REQUIREMENTES Essentially all tests are carried out in accordance with IEC 65- specification, category LCT/UCT/56 (rated temperature range: Lower category temperature, upper category temperature; damp heat, long term, 56 days). The tests are carried out in accordance with IEC 668-2-xx test method, Recommended basic climatic and mechanical robustness testing procedure for electronic components and under standard atmospheric conditions according to IEC 668-, 5.3. In the Test Procedures and Requirements table the tests and requirements are listed with reference to the relevant clauses of IEC 65- and IEC 668-2-xx test methods. 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 65-. All soldering tests are performed with mildly activated flux. www.vishay.com For technical questions, contact: filmresistorsleaded@vishay.com Document Number: 28737 7 Revision: 3-Mar-
Fusible, Non-Flammable Metal Film NFR25, NFR25H TEST PROCEDURES AND REQUIREMENTS IEC 65- CLAUSE IEC 668-2 TEST METHOD TEST PROCEDURE NFR25 REQUIREMENTS NFR25H 4.4. Visual examination No holes; clean surface; no damage 4.4.2 Dimensions (outline) Gauge (mm) See Dimensions Table 4.5 4.8 2 (Tb) 4.29 45 (Xa) Resistance (refer note on first page for measuring distance) Resistance to soldering heat Component solvent resistance 4.7 2 (Ta) Solderability 4.7 4.6 Solderability (after aging) Voltage proof on insulation Robustness of terminations: Applied voltage (+ %/- %): R < Ω:. V Ω R < Ω:.3 V Ω R < kω: V kω R < kω: 3 V kω R 5 kω: V Thermal shock: s; 26 C; 3 mm from body Isopropyl alcohol or H 2 O followed by brushing 2 s; 235 C: Solder bath method; SnPb4 3 s; 245 C: Solder bath method; SnAg3Cu.5 8 h steam or 6 h, 55 C; leads immersed 6 mm; for 2 s at 235 C: Solder bath (SnPb4) for 3 s at 245 C: Solder bath (SnAg3Cu.5) method U RMS = 5 V during min; metal block method R - R nom. : max. ± 5 % ΔR max.: ± (.25 % R +.5 Ω) No visual damage Good tinning ( 95 % covered); no damage Good tinning ( 95 % covered); no damage No breakdown or flashover 4.6.2 2 (Ua) Tensile all samples Load N; s Number of failures < x -6 4.6.3 2 (Ub) Bending half number of samples 4.6.4 2 (Uc) Torsion other half of samples 3 x 36 in opposite directions 4.2 29 (Eb) Bump 3 x 5 bumps in 3 directions; 4 g 4.22 6 (Fc) Vibration 4.9 4 (Na) Rapid change of temperature Load 5 N; 4 x 9 Number of failures < x -6 Frequency Hz to 5 Hz; displacement.5 mm or acceleration g; 3 directions; total 6 h (3 x 2 h) 3 min at LCT and 3 min at UCT; 5 cycles 4.23 Climatic sequence: 4.23.2 2 (Ba) Dry heat 6 h; 55 C 4.23.3 3 (Db) Damp heat (accelerated) st cycle 24 h; 55 C; 9 % to % RH 4.23.4 (Aa) Cold 2 h; - 55 C 4.23.5 3 (M) Low air pressure 2 h; 8.5 kpa; 5 C to 35 C 4.23.6 3 (Db) Damp heat (accelerated) remaining cycles 5 days; 55 C; 95 % to % RH 4.24 78 (Cab) Damp heat (steady state) 4.25. Endurance (at 7 C) 4.25.3 Endurance at upper category temperature 4.8 Temperature coefficient 56 days; 4 C; 9 % to 95 % RH; loaded with. P 7 (IEC steps: V to V) h; loaded with P 7 or U max. ;.5 h ON and.5 h OFF No damage ΔR max.: ± (.25 % R +.5 Ω) No damage ΔR max.: ± (.25 % R +.5 Ω) No damage ΔR max.: ± (.25 % R +.5 Ω) No visual damage ΔR max.: ± (.25 % R +.5 Ω) R ins min.: 3 MΩ ΔR max.: ± (.5 % R +. Ω) R ins min.: 3 MΩ ΔR max.: ± ( % R +.5 Ω) ΔR max.: ± ( % R +.5 Ω) h; no load ΔR max.: ± ( % R +.5 Ω) Between - 55 C and + 55 C.22 Ω R 4.7 Ω 4.7 Ω < R 5 Ω 5 Ω < R 5 kω ± 2 ppm/k ± 2 ppm/k ± ppm/k 4.2 Noise IEC 695 <. μv/v 4.26 Accidental overload Cheese-cloth Non flammable 4.6.. Insulation resistance Maximum voltage U max. DC = 5 V after min; metal block method R ins min.: 4 MΩ ± 2 ppm/k ± ppm/k ± ppm/k Document Number: 28737 For technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com Revision: 3-Mar- 8
NFR25, NFR25H Fusible, Non-Flammable Metal Film 2NC INFORMATION FOR HISTORICAL CODING REFERENCE The resistors have a 2 digit numeric code starting with 23 Last Digit of 2NC Indicating Resistance Decade The subsequent 7 digits indicate the resistor type and packaging The remaining 3 digits indicate the resistance value: - The first 2 digits indicate the resistance value - The last digit indicates the resistance decade RESISTANCE DECADE.22 Ω to.9 Ω Ω to 9. Ω Ω to 9 Ω Ω to 9 Ω LAST DIGIT 7 8 9 kω to 9. kω 2 kω to 5 kω 3 2NC (Resistors Type and Packaging) 2NC Example The 2NC of a NFR25 resistor with value 75 Ω, supplied on a bandolier of units in ammopack is: 2322 25 375. 23........ TYPE BANDOLIER IN AMMOPACK BANDOLIER ON REEL RADIAL TAPED STRAIGHT LEADS STRAIGHT LEADS 4 UNITS UNITS 5 UNITS 5 UNITS NFR25 6 24 3... 22 25 3... 22 25 33... 22 25 23... NFR25H 6 27 3... 22 27 3... 22 27 33... 22 27 23... www.vishay.com For technical questions, contact: filmresistorsleaded@vishay.com Document Number: 28737 9 Revision: 3-Mar-
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