VALUE DESCRIPTION. R > 100 kω R/R max.: ±0.25% Ω R/R max.: ±0.1% Ω

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1 FEATURES Precision resistors in small outlines Low noise. APPLICATIONS All general purpose applications. 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 green lacquer which provides electrical, mechanical, and climatic protection. The encapsulation is resistant to all cleaning solvents in accordance with MIL-STD-22E, method 215, and IEC QUICK REFERENCE DATA VALUE DESCRIPTION Resistance range 4.99 Ω to 1 MΩ 1 Ω to 1 MΩ Resistance tolerance and series ±1%; E24/E96 series Maximum dissipation at T amb =7 C.4 W.6 W Thermal resistance (R th ) 17 K/W 15 K/W Temperature coefficient ±5 1 6 /K Maximum permissible voltage (DC or RMS) 2 V 35 V Basic specifications IEC and Climatic category (IEC 668) 55/155/56 Stability after: load: R 1 kω ±.5% +.5 Ω ±.5% +.5 Ω R > 1 kω ±1% +.5 Ω ±.5% +.5 Ω climatic tests: R 1 kω ±.5% +.5 Ω ±.5% +.5 Ω R > 1 kω ±1% +.5 Ω ±.5% +.5 Ω soldering: R 1 kω ±.1% +.5 Ω ±.1% +.5 Ω R > 1 kω ±.25% +.5 Ω ±.1% +.5 Ω short time overload ±.25% +.5 Ω ±.25% +.5 Ω 1998 Aug 28 1

2 ORDERING INFORMATION Table 1 Ordering code indicating resistor type and packaging TYPE ORDERING CODE BANDOLIER IN AMMOPACK BANDOLIER ON REEL 1 units 5 units 5 units Ordering code (12NC) The resistors have a 12-digit ordering code starting with The subsequent 2 digits indicate the resistor type and packaging; see Table 1. The remaining 4 digits indicate the resistance value: The first 3 digits indicate the resistance value. The last digit indicates the resistance decade in accordance with Table 2. Table 2 Last digit of 12NC RESISTANCE DECADE LAST DIGIT 1 to 9.76 Ω 8 1 to 97.6 Ω 9 1 to 976 Ω 1 1 to 9.76 kω 2 1 to 97.6 kω 3 1 to 976 kω 4 1 to 9.76 MΩ 5 1 MΩ 6 ORDERING EXAMPLE The ordering code of a resistor, value 75 Ω, on a bandolier of 1 units in ammopack is: Aug 28 2

3 FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of ±1%. The values of the E24/E96 series are in accordance with IEC publication 663. handbook, full pagewidth P (W).5.4 T = amb 4 o C 7 o C.3 1 o C o C.1 T m ( o C) 155 o C 1 h 1 h 1 kω 22 kω 22 kω 22 kω % R / R for R 22 kω % R / R for R 22 kω MEA684 Fig.1 Drift nomogram Aug 28 3

4 handbook, full pagewidth P (W).6 T = amb 4 o C 7 o C.4 1 o C o C T m ( o C) 155 o C 1 h 1 h 1 kω 47 kω 1 MΩ % R / R for R 1 MΩ MBG544 Fig.2 Drift nomogram Aug 28 4

5 Limiting values TYPE LIMITING VOLTAGE (1) (V) LIMITING POWER (W) Note 1. The maximum voltage that may be continuously applied to the resistor element, see IEC publication The maximum permissible hot-spot temperature is 155 C. DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.3. handbook, 4 columns P max (%P rated ) CCB T amb ( C) Fig.3 Maximum dissipation (P max ) in percentage of rated power as a function of the ambient temperature (T amb ) Aug 28 5

6 PULSE LOADING CAPABILITIES 1 3 handbook, full pagewidth MEA685-1 Pmax (W) t p /t i = t i (s) 1 Fig.4 Pulse on a regular basis; maximum permissible peak pulse power as a function of pulse duration (t i ). ( Pˆ max ) 6 handbook, full pagewidth Vmax (V) 5 MEA t i (s) 1 Fig.5 Pulse on a regular basis; maximum permissible peak pulse voltage as a function of pulse duration (t i ). ( ) Vˆ max 1998 Aug 28 6

7 1 3 handbook, full pagewidth MLB653 Pmax (W) t p /t i = t i (s) 1 Fig.6 Pulse on a regular basis; maximum permissible peak pulse power as a function of pulse duration (t i ). ( Pˆ max ) 12 handbook, full pagewidth Vmax (V) 1 MLB t i (s) 1 Fig.7 Pulse on a regular basis; maximum permissible peak pulse voltage as a function of pulse duration (t i ). ( ) Vˆ max 1998 Aug 28 7

8 Application information 1 handbook, halfpage T (K) 8 MEA681 5 handbook, halfpage T (K) 4 2 mm 5 mm 1 mm 15 mm MEA P (W) P (W) Fig.8 Hot-spot temperature rise ( T) as a function of dissipated power. Fig.9 Temperature rise ( T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting. 1 handbook, halfpage T (K) 8 MEA686 5 handbook, halfpage T (K) 4 MEA mm 1 mm 15 mm P (W) P (W) Fig.1 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 Aug 28 8

9 MECHANICAL DATA Mass per 1 units TYPE MASS (g) Marking The nominal resistance and tolerance are marked on the resistor using five coloured bands in accordance with IEC publication 662 Colour codes for fixed resistors. Outlines The length of the body (L 1 ) 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 6294 ). handbook, 4 columns For dimensions see Table 3. Table 3 TYPE Resistor type and relevant physical dimensions; see Fig.12 D MAX. (mm) L 1 L 2 Fig.12 Outline. L 1 TYP. (mm) L 2 MAX. (mm) d (mm) ± ±.5 D CCB414 d 1998 Aug 28 9

10 TESTS AND REQUIREMENTS Essentially all tests are carried out in accordance with the schedule of IEC publication , 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 668, Recommended basic climatic and mechanical robustness testing procedure for electronic components and under standard atmospheric conditions according to IEC 668-1, subclause 5.3. Unless otherwise specified the following values apply: Temperature: 15 C to35 C Relative humidity: 45% to 75% Air pressure: 86 kpa to 16 kpa (86 mbar to 16 mbar). In Table 4 the tests and requirements are listed with reference to the relevant clauses of IEC publications and 668 ; 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. All soldering tests are performed with mildly activated flux. Table 4 Test procedures and requirements IEC CLAUSE IEC TEST METHOD TEST PROCEDURE REQUIREMENTS Tests in accordance with the schedule of IEC publication visual examination no holes; clean surface; no damage dimensions (outline) gauge (mm) see Table resistance applied voltage (+/ 1%): R R nom : max. ±1% R<1Ω:.1 V 1 Ω R<1 Ω:.3 V 1 Ω R<1kΩ:1V 1kΩ R<1 kω: 3V 1 kω R<1 kω: 1V 1 kω R<1MΩ:25V 1MΩ R: 5 V 4.18 Tb resistance to soldering heat (Xa) component solvent resistance thermal shock: 3 s; 35 C; 6 mm from body: R 1 kω R > 1 kω isopropyl alcohol or H 2 O followed by brushing in accordance with MIL 22 F ±.1% +.5 Ω ±.25% +.5 Ω no visual damage ±.1% +.5 Ω 4.17 Ta solderability 2 s; 235 C good tinning; no damage 4.7 voltage proof on insulation voltage (RMS) during 1 minute, metal block method: 4 V for, 7 V for no breakdown or flashover 1998 Aug 28 1

11 IEC CLAUSE IEC TEST METHOD TEST 4.13 short time overload room temperature; P = 6.25 P n () or W (); 5 s on 45 s off, 1 cycles (V 2 V max ) ±.25% +.5 Ω 4.16 U robustness of terminations: Ua tensile all samples.45 mm, load 5 N; 1 s number of failures < Ub bending half number of samples Uc torsion other half of samples.58 mm, load 1 N; 1 s.45 mm, load 2.5 N; 4 9 number of failures < mm, load 5 N; Eb bump 3 15 bumps in 3 directions; 4 g 4.22 Fc vibration frequency 1 to 5 Hz; displacement 1.5 mm or acceleration 1 g; 3 directions; total 6 hours (3 2 hours) (Na) rapid change of temperature 4.23 climatic sequence: (D) damp heat (accelerated) 1 st cycle (D) damp heat (accelerated) remaining cycles (Ca) damp heat (steady state) (IEC) PROCEDURE 3 36 in opposite directions no damage ±.1% +.5 Ω 3 minutes at LCT and 3 minutes at UCT; 5 cycles: R 1 kω R > 1 kω no damage ±.1% +.5 Ω no damage ±.1% +.5 Ω no visual damage ±.1% +.5 Ω ±.25% +.5 Ω ±.1% +.5 Ω 6 days; 55 C; 95 to 98% RH: R ins min.: 1 3 MΩ R 1 kω ±.5% +.5 Ω R > 1 kω ±1% +.5 Ω ±.5% +.5 Ω 56 days; 4 C; 9 to 95% RH; loaded with.1 P n (IEC steps: 4 to 1 V): R 1 kω R > 1 kω ±.5% +.5 Ω ±1% +.5 Ω REQUIREMENTS ±.5% +.5 Ω 1998 Aug 28 11

12 IEC CLAUSE IEC TEST METHOD TEST endurance (at 7 C) 1 hours; loaded with P n or V max ; 1.5 hours on and.5 hours off: R 1 kω R > 1 kω (Ba) endurance at upper category temperature temperature coefficient 1 hours; no load: R 1 kω R > 1 kω at 2/LCT/2 C and 2/UCT/2 C (TC 1 6 /K) Other tests in accordance with IEC 6115 clauses and IEC 668 test method (Tb) solderability (after ageing) PROCEDURE 8 hours steam or 16 hours 155 C; leads immersed 6 mm for 2 ±.5 s in a solder bath at 235 ±5 C insulation resistance voltage (DC) after 1 minute, metal block method: 1 V for, 5 V for ±.5% +.5 Ω ±1% +.5 Ω ±.5% +.5 Ω ±.5% +.5 Ω ±1% +.5 Ω REQUIREMENTS ±5 1-6 /K ±.5% +.5 Ω good tinning ( 95% covered); no damage R ins min.: 1 4 MΩ 4.12 noise IEC publication 6195 (measured with Quantech-equipment): R 68 kω max..1 µv/v max..1 µv/v R 1 kω max..5 µv/v max..1 µv/v R 1MΩ max. 1.5 µv/v max..1 µv/v R > 1MΩ max. 1.5 µv/v max. 1.5 µv/v see 2 nd amendment to IEC , Jan. 87 pulse load see Figs 4 and 5 see Figs 6 and Aug 28 12