Fusible, Non-Flammable Metal Film Leaded Resistors

Transcription

1 Fusible, Non-Flammable Metal Film Leaded Resistors 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 gray, flame retardant lacquer which provides electrical, mechanical, and climatic protection. The encapsulant is resistant to all cleaning solvents in accordance with IEC 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 Material categorization: for definitions of compliance please see APPLICATIONS Audio Video TECHNICAL SPECIFICATIONS DESCRIPTION NFR25 NFR25H Resistance range ().22 to 5 k.22 to 5 k Resistance tolerance 5 % 5 % Resistance series E24 E24 Rated dissipation P 7.33 W.5 W Thermal resistance (R th ) 24 K/W 5 K/W Temperature coefficient.22 R R 5 5 R 5 k ± 2 ppm/k ± 2 ppm/k ± ppm/k 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 ± 2 ppm/k ± ppm/k ± ppm/k Operating voltage, U max. DC or RMS 25 V 35 V Basic specifications IEC 6 5- IEC 6 5- Climatic category (IEC 668-) 55/55/56 55/55/56 Maximum resistance change for resistance range, R max., after: Load ( h, P 7 ): ( % R +.5 ( % R +.5 Long term damp heat test (56 days): ( % R +.5 ( % R +.5 Soldering (26 C, s): (.25 % R +.5 (.25 % R +.5 Revison: 6-Sep-6 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

2 PACKAGING MODEL TAPING AMMOPACK REEL PIECES CODE PIECES CODE Axial, 52 mm 5 A5 A 5 R5 Radial 2 N2 - - DIMENSIONS L Ø d Ø D L 2 Outline DIMENSIONS (Resistor types, mass, and relevant physical dimensions) TYPE NFR25 NFR25H D max. (mm) L max. (mm) L 2 max. (mm) Ø d (mm) MASS (mg) ±.5 2 PART NUMBER AND PRODUCT DESCRIPTION Part Number: NFR25227JA N F R J A MODEL/SIZE VARIANT TCR/MATERIAL VALUE TOLERANCE PACKAGING () SPECIAL NFR25 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 Notes The PART NUMBER is shown to facilitate the introduction of the unified part numbering system () Please refer to table PACKAGING, see next page J = ± 5 % NFR25 5 % A R22 MODEL / SIZE TOLERANCE PACKAGING () RESISTANCE VALUE NFR25 NFR25H ± 5 % N2 A5 A R5 K = k 4R7 = 4.7 N2 A5 A R5 Up to 2 digits are used for all special parts. = standard Revison: 6-Sep-6 2 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

3 PRODUCTS WITH RADIAL LEADS () 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 center 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 / - mm W Tape width 8. ±.5 mm W Minimum hold down tape width 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 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. 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). 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. LIMITING VALUES TYPE LIMITING VOLTAGE U () (V) LIMITING POWER P 7 (W) NFR 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. Revison: 6-Sep-6 3 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

4 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 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 (s) 2 3 t (s) P overload (W) NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: P overload (W) NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: R 5 3 t (s) P overload (W) NFR25 This graph is based on measured data which may deviate according to the application. Fusing Characteristics: 5 R 5 k Revison: 6-Sep-6 4 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

5 FUSING CHARACTERISTICS 3 3 t (s) t (s) P overload (W) P overload (W) NFR25H This graph is based on measured data which may deviate according to the application. Fusing Characteristics: NFR25H This graph is based on measured data which may deviate according to the application. Fusing Characteristics: R 5 k PULSE LOADING CAPABILITIES 3 Pˆ max. (W) 2 t p /t i = t i (s) NFR25 Pulse on a regular basis; maximum permissible peak pulse power ( Pˆ max.) as a function of pulse duration (t i ),.22 R k 3 Pˆ max. (W) 2 t p /t i = ti (s) NFR25 Pulse on a regular basis; maximum permissible peak pulse power ( Pˆ max.) as a function of pulse duration (t i ),5 R 5 k Revison: 6-Sep-6 5 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

6 PULSE LOADING CAPABILITIES 6 ˆ (V) 5 U max t i (s) NFR25 Pulse on a regular basis; maximum permissible peak pulse power (Û max. ) as a function of pulse duration (t i ) 3 Pˆ max. (W) 2 t p /t i = ti (s) 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 t i (s) NFR25H Pulse on a regular basis; maximum permissible peak pulse power ( Pˆ max.) as a function of pulse duration (t i ) Revison: 6-Sep-6 6 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

7 APPLICATION INFORMATION ΔT (K) 8 ΔT (K) P (W) NFR25 Hot-spot temperature rise (T) as a function of dissipated power P (W) NFR25H Hot-spot temperature rise (T) as a function of dissipated power 5 ΔT (K) 4 5 ΔT (K) 4 5 mm mm mm 5 mm 3 2 mm 5 mm P (W) Minimum distance from resistor body to PCB. = mm NFR25 Temperature rise (T) at the 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 xx test method, Recommended basic climatic and mechanical robustness testing procedure for electronic components and under standard atmospheric conditions according to IEC 668-, P (W) Minimum distance from resistor body to PCB. = mm NFR25H Temperature rise (T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting In the Test Procedures and Requirements table the tests and requirements are listed with reference to the relevant clauses of IEC 65- and IEC 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. Revison: 6-Sep-6 7 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

8 TEST PROCEDURES AND REQUIREMENTS IEC 65- CLAUSE IEC TEST METHOD TEST PROCEDURE NFR25 REQUIREMENTS NFR25H 4.4. Visual examination No holes; clean surface; no damage Dimensions (outline) Gauge (mm) See Dimensions Table Applied voltage (+ % / - %): R < :. V 4.5 Resistance R < :.3 V (refer note on first page R < k: V for measuring distance) kr < k 3 V R - R nom. : max. ± 5 % kr 5 k: V (Tb) Resistance to soldering Thermal shock: s; 26 C; heat 3 mm from body R max.: ± (.25 % R +.5 ) (Xa) Component solvent Isopropyl alcohol or H 2 O followed by resistance brushing No visual damage (Ta) Solderability 2 s; 235 C: Solder bath method; SnPb4 3 s; 245 C: Good tinning (95 % covered); no damage Solder bath method; SnAg3Cu.5 Solderability (after aging) 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 Good tinning (95 % covered); no damage 4.7 Voltage proof on insulation U RMS = 5 V during min; metal block method No breakdown or flashover 4.6 Robustness of terminations: (Ua) Tensile all samples Load N; s Number of failures < x (Ub) Bending half number of samples Load 5 N; 4 x 9 Number of failures < x (Uc) Torsion other half No damage 3 x 36 in opposite directions of samples R max.: ± (.25 % R +.5 ) (Eb) Bump 3 x 5 bumps in 3 directions; 4 g No damage R max.: ± (.25 % R +.5 ) (Fc) Vibration Frequency Hz to 5 Hz; displacement.5 mm or acceleration No damage R max.: ± (.25 % R +.5 ) g; 3 directions; total 6 h (3 x 2 h) (Na) Rapid change of temperature 3 min at LCT and 3 min at UCT; 5 cycles No visual damage R max.: ± (.25 % R +.5 ) 4.23 Climatic sequence: (Ba) Dry heat 6 h; 55 C (Db) Damp heat (accelerated) st cycle 24 h; 55 C; 9 % to % RH (Aa) Cold 2 h; -55 C (M) Low air pressure 2 h; 8.5 kpa; 5 C to 35 C (Db) Damp heat (accelerated) remaining cycles 5 days; 55 C; 95 % to % RH R ins min. 3 M R max.: ± (.5 % R +. ) (Cab) Damp heat (steady state) 56 days; 4 C; 9 % to 95 % RH; loaded with. P 7 (IEC steps: V to V) R ins min. 3 M R max.: ± ( % R +.5 ) Endurance (at 7 C) h; loaded with P 7 or U max. ;.5 h ON and.5 h OFF R max.: ± ( % R +.5 ) Endurance at upper category temperature h; no load R max.: ± ( % R +.5 ) Between -55 C and +55 C 4.8 Temperature coefficient.22 R 4.7 ± 2 ppm/k ± 2 ppm/k 4.7 < R 5 ± 2 ppm/k ± ppm/k 5 < R 5 k ± ppm/k ± ppm/k 4.2 Noise IEC 695 <. μv/v 4.26 Accidental overload Cheese-cloth Non flammable Insulation resistance Maximum voltage U max. DC = 5 V after min; metal block method R ins min. 4 M Revison: 6-Sep-6 8 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

9 2NC INFORMATION FOR HISTORICAL CODING REFERENCE The resistors have a 2 digit numeric code starting with 23 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 Last Digit of 2NC Indicating Resistance Decade RESISTANCE DECADE LAST DIGIT.22 to.9 7 to 9. 8 to 9 9 to 9 k to 9. k 2 k to 5 k 3 2NC Example The 2NC of a NFR25 resistor with value 75, supplied on a bandolier of units in ammopack is: NC (Resistors Type and Packaging) TYPE BANDOLIER IN AMMOPACK BANDOLIER ON REEL RADIAL TAPED STRAIGHT LEADS STRAIGHT LEADS 2 UNITS UNITS 5 UNITS 5 UNITS NFR NFR25H Revison: 6-Sep-6 9 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

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