1、O - EIA 37b 70 H 3234600 00bb773 O - ANSI / C83.61-1971 Approved July 14, 1971 AMERICAN NATIONAL STANDARDS INSTITUTE EIA STANDARD Fixed Film Dielectric Capacitors in Metallic and Non-Metallic Cases for D.C. Application 9 v) Y RS-37 July 1970 Engineering Department ELECTRONIC INDUSTRIES ASSOCIATION I
2、 EIA 376 70 3234600 O066774 2 1 NOTICE EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and purchasers, facilitating interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaini
3、ng with minimum delay the proper product for his particular need. Existence of such standards shall not in any respect pre- clude any member or non-member of EIA from manufacturing or selling products not conforming to such standards, nor shall the existence of such standards preclude their voluntar
4、y use by those other than EIA members whether the standard is to be used either domestically or internationally. Recommended standards are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assye any l
5、iability to any patent owner, nor does it assume any obligation whatever to parties adoptmg the recommended standards. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W., Washington, D. C. 20006 OElectronk Industries Association 1970 All rigtits reserved PRIC
6、E: $4.80 Printed In U.S.A. EIA 376 70 m 323LlbOO 00bb775 Ll m RS-376 Page I FIXED FILM DIELECTRIC CAPACITORS IN METALLIC AND NON-METALLIC CASES FOR D.C. APPLICATION (From Standards Proposal No. 1042, formulated under the cognizance of EIA Working Group P-2.2 on Film, Paper and Plastic Dielectric Cap
7、acitors) 1. SCOPE 1.1 This EIA Standard covers the general requirements for direct current (D.C.) film dielectric, fixed capacitors in metallic and non-metallic cases. Capacitors listed are used primarily in entertainment, commercial and industrial equipment for filtering, bypass, coupling, and bloc
8、king purposes where D.C. voltages predominate. A.C. application information is given in Par. 5. 1.2 2.1 O 376C Class 2.1.1 Portions of EIA Standards RS-186 and RS-178, when specified, form a part of this Standard. 2. STANDARD DESIGNATION AND STY LES The EIA Standard designation shall consist of eigh
9、t constituent parts as illustrated below: Style Terminal Circuit Characteristic Voltage Capacitance Tolerance 2.1.2 2.1.3 2.1.4 2.1.5 2.1.6 2.1.7 2.1.8 2.1.1 Class designation 2.1.1.1 Class designation signifies the component is a capacitor made to the requirements of EIA Standard RS-376. 2.1.2 Styl
10、e designation Style designation distinguishes the case form and internal construction. (A detailed parts specification with pertinent data on each style can be found in the appendix of this Standard.) 2.1.2.1 Styles 04 and 05 are hermetically sealed, inserted tab, metal cased tubulars with axial wir
11、e leads. 2.1.2.2 Styles 08 and 09 are hermetically sealed, extended foil, insulated metal cased tubular capacitors with axial wire leads. ,- . EIA 37b 70 m 323VbOO 00bb77b b m I I RS.376 Page 2 2.1.2.3 Style 25 is a round plastic film wrapped capacitor with plastic end seals and axial wire leads. 2.
12、1.2.4 Style 26 is an oval or flat plastic film wrapped capacitor with plastic end seals and axial wire leads. 2.1.2.5 Style 30 is a round plastic tubed capacitor with plastic end seals and axial leads. 2.1.2.6 Style 3 1 is a rectangular pre-molded plastic-cased capacitor with plastic end seals and a
13、xial leads. 2.1.2.7 Style 32 is a rectangular pre-molded plastic-cased capacitor with plastic end seals and radial leads. 2.1.2.8 Style 33 is a round plastic tubed capacitor with recessed metal end caps and axial leads. 2.1.2.9 Style 40 is a molded cased tubular (either pre-molded or fully molded) w
14、ith axial leads. 2.1.2.10 Style 42 is a molded cased flat or oval capacitor with mounting feet and radial leads. 2.1.2.1 1 Style 50 is a dip coated or plastic cased round capacitor with radial leads. 2.1.2.12 Style 52 is a dip coated or plastic cased oval or flat capacitor with radial leads. 2.1.3 T
15、erminal Type Terminal type is designated as follows: A. Axial wire leads B. Solder lug (non-removable) R. Radial wire leads 2.1.4 Schematic The schematic circuit number indicates the circuit as follows: Schematic circuit number EIA 37b 70 3234b00 00bb777 8 RS-376 Page 3 2.1.5 Characteristic The char
16、acteristic letter designates the capacitance change with temperature and the operating temperature range as shown in Table I. TABLE I CHARACTERISTIC“ *NOTE: Insulation resistance variation with temperature is shown in detailed parts specifications in appendices of this Standard. 2.1.5.1 Dielectrics
17、Although not limited to the following plastic films, the dielectric for the various Characteristics may be: M. Polyethylene terephthalate with a casing capable of operation to 125C. X. Polyethylene terephthalate with a casing limited to operation up to 1UO“C. H. Polyethylene terephthalate with an im
18、pregnant limiting operation to 85C. f - EIA 37b 70 m 3234b00 0066778 T W RS-376 Page 4 J. Polystyrene for operation to 65C. P. Polystyrene for operation to 85OC. T. Polyfluoroethylene for operation to 170C. C. Polycarbonate with a casing capable of operation to 125C. Y. Polycarbonate with a casing l
19、imited to operation up to 100C. 2.1.6 Voltage Rating The voltage rating is designated by the following descriptive letter: Voltage Letter Rated D.C. Voltage Z A Y B C E F G 30 50 75 1 O0 200 400 600 1 O00 2.1.7 Capacitance Value The nominal capacitance value is described by three digits; the first a
20、nd secorid digits are the first and second significant figures of the nominal capacitance expressed in picofarads (pF). The third digit states the number of zeros following the two significant figures. Example: 5 6 2 5 6 00pF. or .0056pF 2.1.8 Capacitance Tolerance The allowable capacitance toleranc
21、e from the nominal value is expressed by a letter designation as follows: DESIGNATION CAPACITANCE TOLERANCE (% OF NOMINAL) F G J K M +i% +2% +S% 110% 120% - -. ? EIA 376 70 3234600 0066773 L W RS-376 Page 5 3. STANDARD TESTS 3.1 Standard Test Conditions 3.1.1 or referred to, are as follows: Unless o
22、therwise specified, the atmospheric conditions at which tests are to be made, Temperature Barometric pressure . . . , . . . . . . . . . . . . . . . . . . . 28” to 32” Hg. Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . Less than 80% . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . 25C plus 1 0C minus 5C 3.2 Testing Program 3.2.1 Recommended order of tests shall be in the sequence listed in Table II. TABLE II Group 1 (All Samples) Mechanical Inspection Marking Dielectric Test Capacitance Dissipation factor Insulation Resistance Leak Test (Metal Cased Styles Only) Group 2
24、(50% of Samples) Mechanical Tests (except bending and vibration tests) Capacitance change at low temperature Capacitance change at high temperature Insulation resistance at high temperature Life Group 3 (50% of Samples for non-metal cased styles and 25% for metal cases styles) Bending Test Humidity
25、Test Group 4 (25% of Samples, metal cased styles) Vibration Paragraph 3.3 4. 3.5 3.6 3.7 3.8 3.13 3.4 3.10 3.9 3.8.4 3.1 1 3.4.2.1 3.12 3.4.5 I . EIA 37b 70 3234600 00bb780 8 RS-376 Page 6 3.2.2 agreement between the user nd the supplier. 3.2.3 The types of tests, number of samples and allowable fai
26、lures shall be determined by No Sample shall be subjected to both Group 2 and Group 3 tests and Group (and 4) tests. 3.3 Mechanical Inspection 3.3.1 3.3.2 Dimensions must be within the tolerance allowed. Marking shall be legible, complete and correct. 3.4 Mechanical Tests 3.4.1 3.4.2 3.4.3 3.4.4 3.4
27、.5 Pull Test 3.4.1.1 Capacitors shall withstand a steady pull as specified in the detailed parts specification applied in the direction of the terminal egress for 10 seconds, per RS-186, Method 6, Type 1. Terminals shall not fracture or break, nor shall there be any damage to the capacitor or seal.
28、Bending Test 3.4.2.1 Capacitors shall have the load specified in the detailed parts specification freely suspended from each of its leads in turn, for 2 (two) bends per RS-186, Method 6, Type III test. Two bends in opposite direction shall be applied. The leads shall not fracture or break, nor shall
29、 there be any damage to the capacitor or seal. Ductility Test 3.4.3.1 Five complete turns of each lead shall be wound around a cylinder having a diameter equal to the nominal diameter of the lead wire.The leads and lead coating shall not fracture or break. Solderability Test 3.4.4.1 Lead wires shall
30、 be subjected to solderability tests of EIA Standard RS-178, Test Condition I. At the completion of the test, the lead wires shall show evidence of acceptable solderability. Vibration Metal cased styles shall be subjected to vibration requirements of EIA Standard RS-186, Method 7, Type I test. The c
31、apacitors shall be securely fastened by their normal mounting means. Wire-lead a capacitors shall be secured 1/2” f 1/8” from the case. EIA 37b 70 3234b00 OObb7BL T = RS-376 Page 7 During the last 30 minutes of vibration in each direction, a signal of 1 KHz f 200 Hz at a level of 1 f 0.2.iolts shoul
32、d be placed across the capacitor and measured with a suitable alternating current recording device for the purpose of determining the presence of open circuits, short circuits, or intermittent contacts. 3.5 Dielectric Withstanding Voltage Test (See applicable portions of EIA Standard RS-186, Method
33、4) 3.5.1 Terminal to Terminal Capacitors shall be flash tested for no less than one second nor more than five seconds by applying between terminals a potential of 250% of rated voltage for capacitors rated 600VDC and less. Higher ratings shall be tested at 200% of rated voltage for no less than one
34、second nor more than five seconds. 3.5.1.1 An alternate test of fifteen seconds duration may be used in place of the flash test by subjecting capacitors rated 600VDC and less to 200% of rated voltage and higher rated capacitors to 150% of rated voltage. 3.5.1.2 Test voltages shall be applied through
35、 a current limiting resistor of not less than 20 ohms per volt and not more than 1000 ohms per volt. 3.5.1.3 Capacitors shall be discharged through current limiting resistor described in paragraph 3.5.1.3. 3.5.1.4 Capacitors shall not become short circuited or otherwise damaged as a result of applic
36、ation of dielectric test voltages of paragraphs 3.5.1 or 3.5.1.1. 3.5.2 Terminal to Case (where case is not a terminal): 3.5.2.1 For metal cased styles in cylindrical cases 1/2” nominal diameter or less, apply 200% of rated DC voltage or 500V whichever is greater for one second. (Dimension does not
37、include insulating sleeve.) For cases larger than 1 /2”, apply 400% of the rated DC Voltage for one second for capacitors rated 600 volts and under, and apply 200% of the rated DC voltage plus 1000VDC for all capacitors rated above 600 volts. 3.5.2.2 For non-metallic cased styles, the test shall be
38、conducted by closely wrapping metal foil around the capacitor case to within 1/8” of the lead wires or the end of the capacitor body and applying the voltage for the duration specified in either 3.5.1 or 3.5.1.1. 3.5.3 Insulating Sleeve Test Styles having a metal case with insulating sleeve on the c
39、apacitor body shall have a potential of 2000VDC applied for one second between the capacitor case and a RS-376 Page 8 EIA 376 70 m 3234600 00bb782 I m closely wrapped metal foil placed around the capacitor sleeve. The metal foil shall be of such dimension as to allow 7/64” to 9/64” insulating surfac
40、e exposure on both ends. a 3.6 Capacitance 3.6.1 Measurements of capacitance shall be made at or referred to 1000 Hz for ratings not in excess of 1 .Opf. For ratings above 1 .OpF, measurement shall be made at or referred to 60 Hz. 3.6.2 used for capacitance measurements. Equipment having an accuracy
41、 of at least 10% of the capacitance tolerance shall be 3.6.3 Capacitance measured shall be within capacitance tolerance marking. 3.7 Dissipation Factor 3.7.1 Measurements of dissipation factor shall be made at or referred to 1000 Hz for ratings not in excess of 1 .O pF. For ratings above 1 .OpF, mea
42、surement shall be made at or referred to 60 Hz. 3.7.2 3.7.3 Dissipation factor shall be less than the maximum limit listed in Table 1 corresponding to the applicable characteristic. Measurement accuracy shall be k 2% of dial reading or .O0 1, whichever is greater. 8 3.8 Insulation Resistance 3.8.1 w
43、hichever is less. Test in accordance with EIA Standard RS-186, Method 13, at rated voltage or 500V 3.8.2 requirements shown in detailed parts specifications in appendix of this standard. Insulation resistance values measured between terminals of capacitors shall meet 3.8.3 Correction for insulation
44、resistance measurements taken at temperatures other than at 25OC is shown in Table 3. Divide the measured value by the correction factor corresponding to temperature of measurement. 3.8.4 Insulation resistance at high temperature: Insulation resistance will be measured as specified in 3.8.1 and 3.8.
45、2 except with the capacitor stabilized at the high ambient temperature (I3”C) specified in Table I. 3.8.5 Insulation resistance terminal to case (metal cased styles only): When the case is not a terminal, the measurement shall be made between each e- .- EIA 376 70 = 3234600 0066783 3 = TABLE III INS
46、ULATION RESISTANCE CORRECTION FACTORS Degrees C Correction Factor 20 21 22 23 24 25 26 27 1.42 1.33 1.24 1.16 1 .O8 1 .o0 0.94 0.87 3.9 3.10 3.1 1 Degrees C Correction Factor 28 29 30 31 32 33 34 35 0.82 0.76 0.71 0.67 0.63 0.59 0.55 0.5 1 terminal and the case at 25OC as specified in 3.8.1 and 3.8.
47、3. The insulation resistance shall exceed 50,000 megohms. Capacitance change at high ambient temperature 3.9.1 temperature shown in Table I. Repeat the capacitance measurements of paragraph 3.6 except at the applicable high 3.9.2 Capacitors measured in paragraph 3.9.1 shall meet limits specified in
48、Table I. Capacitance change at low ambient temperature 3.10.1 Repeat the capacitance measurements of paragraph 3.6 except at the applicable low temperature shown in Table I. 3.10.2 Capacitors measured in paragraph 3.1 O. 1 shall meet limits specified in Table I. High ambient temperature life test 3.
49、1 1.1 Capacitors shall be subjected to a 250 hour accelerated life test with 140% %5% of rated voltage (or derated voltage where applicable) applied at the highest operating temperature shown in Table I. 7 EIA 376 70 W 3234600 0066784 5 RS-376 Page 10 The voltage shall be applied to each capacitor through a separate current limiting resistor ranging from 20 ohms to 1000 ohms per volt of the applied voltage. Distance between capacitors shall be a minimum of one inch. Adequate air circulation shall be provided to maintain capacitors at a temperature within I3”C of
