FEATURES Overload protection without the risk of fire Grey coating for ease of recognition Reduced size of final equipment Low assembly costs Higher component and equipment reliability. APPLICATIONS Power supplies in small sized equipment Car telephones Portable radio, CD and cassette players. DESCRIPTION The resistors are constructed on a high grade ceramic body (aluminium oxide). Internal metal electrodes are added at each end and connected by a resistive paste which is applied to the top surface of the substrate. The composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to within tolerance, by laser cutting of this resistive layer. The resistive layer is covered with a protective coat and printed with the resistance value. Finally, the two external end terminations are added. For ease of soldering the outer layer of these end terminations is a lead/tin alloy. To enable recognition of a fusible device, the resistor should be mounted face up. QUICK REFERENCE DATA DESCRIPTION VALUE Resistance range to 5 Ω; E24/E96 series Resistance tolerance ± Temperature coefficient: to4.7ω ±250 6 /K 5. to 5 Ω ±200 6 /K Absolute maximum dissipation at T amb =70 C 0.25 W Maximum permissible voltage 200 V (DC or RMS) Operating temperature range 55 C to +25 C Climatic category ( 60068) 55/25/56 Basic specification 605-8 ORDERING INFORMATION Table Ordering code indicating type and packaging ORDERING CODE 2322 750... PAPER TAPE ON REEL 5000 units 6... Ordering code (2NC) The resistors have a 2-digit ordering code starting with 2322 The subsequent 4 digits indicate the resistor type and packaging; see Table. 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 2NC RESISTANCE DECADE LAST DIGIT to 9.76 Ω 8 to 97.6 Ω 9 0 to 240 Ω ORDERING EXAMPLE The ordering code of a resistor, value 200 Ω, packed in paper tape and supplied on a reel of 5000 units is: 2322 750 6200. 999 Feb 36
FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of ±. The values of the E24/E96 2 t (s) 2,,,,,,,,,,, series are in accordance with publication 60063. Fusing characteristics The resistors will fuse without the risk of fire and within an indicated range of overload. Fusing means that the CCA852 2 t (s) 2 resistive value of the resistor increases at least 0 times; see Figs and 2. The fusing characteristic is measured under constant voltage with resistors mounted on a ceramic or glass epoxy (FR4) substrate; see Fig.3.,, CCA853 8 0 2 4 6 3 P overload (W) This graph is based on measured data which may deviate according to the application. Fig. Fusing characteristic: Ω R < 240 Ω, measured using ceramic board material. 8 0 2 4 6 3 P overload (W) This graph is based on measured data which may deviate according to the application. Fig.2 Fusing characteristic: Ω R < 240 Ω, measured using glass epoxy (FR4) board material. resistor mount (FACE UP) handbook, full pagewidth lead frame mount Al 2 O 3 or FR4 40.3 7.6 0.635 mm conductor: NiCr Au.5 µm Ni 0.5 µm Au 0. µm.7.0 mm Fig.3 Test substrate layout. CCB649 999 Feb 362
Limiting values LIMITING VOLTAGE () LIMITING POWER (W) 200 (2) 0.25 Notes. The maximum voltage that may be continuously applied to the resistor element, see publication 605-8. 2. The maximum voltage that may be applied after fusing is shown in Fig.4. 50 V max 40 30 20 MBG605 2 R 3 n (Ω) Fig.4 Maximum applied voltage after fusing. DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.5. PULSE LOADING CAPABILITIES 2 MBG607 V max Pmax (%P rated) 0 MLB206.2/50 µsec /700 µsec 50 0 55 0 50 70 0 25 o T amb ( C) 2 R n (Ω) 3 These pulses may not be applied on a regular basis. Fig.5 Maximum dissipation (P max ) in percentage of rated power as a function of the ambient temperature (T amb ). Fig.6 Maximum permissible peak pulse voltage without failing to open circuit in accordance with DIN 60040 (CO) 533. 999 Feb 363
3 handbook, full pagewidth MBG606 Pmax (W) 2 single pulse tp/ti = 00 6 5 4 3 2 t i (s) Fig.7 Pulse on a regular basis; maximum permissible peak pulse power ( Pˆ max ) as a function of pulse duration, single pulse and repetitive pulse t p /t i = 00. 600 handbook, full pagewidth Vmax 500 MBG608 400 300 200 0 0 6 5 4 3 2 t i (s) Fig.8 Pulse on a regular basis; maximum permissible peak pulse voltage ( Vˆ max ) as a function of pulse duration. 999 Feb 364
MECHANICAL DATA Mass per 0 units MASS (g).0 Marking All resistors are marked with a four digit code on the protective coat to designate the nominal resistance value. 4-DIGIT MARKING For all values, the R is used as a decimal point. Example MARKING 20R PACKAGE MARKING RESISTANCE 20 Ω The packaging is also marked and includes resistance value, tolerance, catalogue number, quantity, production period, batch number and source code. Outlines handbook, 4 columns Table 3 T W,,, t b For dimensions see Table 3. t t,,,,,, 220R Chip resistor type and relevant physical dimensions; see Fig.9 L 3.20 +0./ 0.20 L Fig.9 Outlines. W protective coat,, resistor layer inner electrode,,, T end termination ceramic substrate protective coat marking MBE929 t t t b.60 ±0.5 0.55 ±0. 0.45 ±0.25 0.50 ±0.25 999 Feb 365
TESTS AND REQUIREMENTS Essentially all tests are carried out in accordance with the schedule of publication 605-8, 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 publication 60068, Recommended basic climatic and mechanical robustness testing procedure for electronic components and under standard atmospheric conditions according to 60068-, subclause 5.3. Unless otherwise specified the following values apply: Temperature: 5 C to35 C Relative humidity: 4 to 7 Air pressure: 86 kpa to 6 kpa (860 mbar to 60 mbar). In Table 4 the tests and requirements are listed with reference to the relevant clauses of publications 605-8 and 60068 ; a short description of the test procedure is also given. In some instances deviations from the recommendations were necessary for our method of specifying. All soldering tests are performed with mildly activated flux. Table 4 Test procedures and requirements 605-8 CLAUSE 60068-2 TEST METHOD TEST PROCEDURE REQUIREMENTS Tests in accordance with the schedule of publication 605-8 4.4. visual examination no holes; clean surface; no damage 4.4.2 dimensions (outline) gauge 0.45 T 0.65.45 W.75 3.0 L 3.3 4.5 resistance applied voltage (+0/ %): R R nom : max. ± R<Ω: 0. V Ω R<0 Ω: 0.3 V 0 Ω R<240 Ω: V 4.8 20 (Tb) resistance to soldering heat unmounted chips; ± s; 260 ±5 C R/R max.: ±(% +0.05 Ω) 4.29 45 (Xa) component solvent resistance 999 Feb 366 isopropyl alcohol or H 2 O followed by brushing in accordance with MIL 202 F 4.7 20 (Ta) solderability unmounted chips completely immersed for 2 ±0.5 s in a solder bath at 235 ±2 C 4.7 voltage proof on insulation maximum voltage (RMS) during minute metal block method 4.3 short time overload room temperature; P = 6.25 P n ; 5 s (V 2 V max ) 4.33 bending resistors mounted on a 90 mm glass epoxy resin PCB (FR4), bending: 3 mm 4.9 4 (Na) rapid change of temperature 4.24.2 3 (Ca) damp heat (steady state) 30 minutes at LCT and 30 minutes at UCT; 5 cycles good tinning ( 9 covered); no breakdown or flashover R/R max.: ±(% +0.05 Ω) R/R max.: ±(% +0.05 Ω) R/R max.: ±(% +0.05 Ω) 56 days; 40 ±2 C; 93 +2/ 3% RH; R/R max.: ±(3% +0. Ω) loaded with 0.0 P n
605-8 CLAUSE 60068-2 TEST METHOD 4.25. endurance 00 +48/ 0 hours; 70 ±2 C; loaded with P n or V max ;.5 hours on and 0.5 hours off 4.23.2 27 (Ba) endurance at upper category temperature R/R max.: ±(3% +0. Ω) 00 +48/ 0 hours; no load R/R max.: ±(3% +0. Ω) 4.8.4.2 temperature at 20/LCT/20 C and 20/UCT/20 C: coefficient R<5Ω ±250 6 /K R 5 Ω ±200 6 /K Other tests in accordance with 605 clauses and 60068 test method 4.7 20 (Ta) solderability (after ageing) 8 hours steam or 6 hours 55 C; unmounted chips completely immersed for 2 ±0.5 s in a solder bath at 235 ±2 C 4.6.. insulation resistance voltage (DC) after minute, metal block method: 0 V 4.2 noise publication 6095 (measured with Quantech-equipment) Other applicable tests (JIS) C 5202 7.5 resistance to damp heat (steady state) TEST PROCEDURE REQUIREMENTS 00 +48/ 0 hours; 40 ±2 C; 93 +2/ 3% RH; loaded with P n or V max ;.5 hours on and 0.5 hours off good tinning ( 9 covered); no damage R ins min.: 3 MΩ max. 2 µv/v R/R max.: ±( +0. Ω) leaching unmounted chips 60 ± s; 260 ±5 C good tinning; no leaching trio damp heat test 00 +48/ 0 hours; 85 ±2 C; 85 ± RH; loaded with 0. P n or V max R/R max.: ±( +0. Ω) 999 Feb 367