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| KOA SPEER ELECTRONICS, INC. SS-02 R6 AHA 6/20/07 Fixed Ceramic Composition Resistors Type PCF 1. Scope of Application This specification relates to non-flammable coated, insulated type, fixed ceramic resistors (type PCF) manufactured by KOA T&T Corporation. 2. Dimension and Construction L Ceramic Body l Type d PCF1/2 PCF1 PCF2 Marking Flame Retardant Coating C End Cap Lead Wire L .354.039 (9.01.0) 0.65.039 (16.51.0) .748.039 (19.01.0) CERTIFIED CERTIFIED D Dimensions inches (mm) C (max.) D d (nom.) .437 (11.1) .748 (19.0) .886 (22.5) .138.02 (3.50.5) .217.039 (5.51.0) .276.039 (7.01.0) .028 (0.7) .031 (0.8) l 1.18.118 (30.03.0) 1.50.118 (38.03.0) Type Designation Allowable uncoated area of resistor end surface 1/2 1.5 1 2.2 2 2.9 D unit: mm 3. Type Designation The type designation shall be in the following form: PCF Type 1/2 Power Rating 1/2 1 2 C Termination Material C: SnCu (Other termination styles available, contact factory for options) T631 Taping T631 T52 R Packaging A: Ammo R: Reel 102 Nominal Resistance 2 significant figures + 1 multiplier K Tolerance K: 10% M: 20% PAGE 1 OF 6 Bolivar Drive P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. KOA SPEER ELECTRONICS, INC. SS-02 R6 4. Applications and Ratings Part Designation PCF1/2 PCF1 PCF2 Power Rating @ 70C 0.5W 1.0W 2.0W Minimum Dielectric Withstanding Voltage 500V 700V Resistance Range E-12 4.7 - 100K 3.3 - 390K Resistance Tolerance Absolute Maximum Working Voltage 200V K: 10% M: 20% 300V 400V Absolute Maximum Overload Voltage 400V 600V 800V Absolute Maximum Pulse Voltage* 10kV 14kV 20kV Operating Temperature Range -40C to +200C * Resistance to pulse: change shall be 5% of the pre-test values. 1 sec. ON, 1 second OFF, 20,000 cycles. The voltage is applied with maximum pulse voltage. 5. Characteristics No. 1 Requirement (MIL-STD 202) Resistance (Method 303) Characteristics Resistance to the nominal resistance should be in each resistance tolerance shown below. Resistance Tolerance 10% 20% Test Method In the event of a difference in resistance readings attributable to the test voltage used, the specified test voltage listed below shall be used. Nominal Resistance Recommended Test Range Voltages (DC Volts) 3.3 to 9.1 ohms 10 to 91 ohms 100 to 910 ohms 1k to 9.1k ohms 10k to 91k ohms 100k to 1M ohms 0.3 1.0 3.0 3.0 3.0 3.0 K M 2 Temperature Coefficient (Method 304) -1300 300ppm/C Resistors shall be maintained within 1C at the ambient temperatures listed below. The use of forced circulating air is recommended to assure temperature stability and uniformity. Resistance measurements shall be made at each temperature 15 minutes after air temperature has stabilized at the specified temperature. The percent difference in resistance referred to the resistance at +25C shall be computed with the following formula: Percent Resistance = (R-r) x 100 Difference r Where: R is the resistance at test temperature r is the resistance at +25C Sequence 1 2 3 4 5 Ambient Temperature +25C -40C +25C +75C +125C PAGE 2 OF 6 Bolivar Drive P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. KOA SPEER ELECTRONICS, INC. SS-02 R6 5. Characteristics (Continued) No. 3 Requirement (MIL-STD 202) Voltage Coefficient from 1k ohms ~ (Method 309) Characteristics 0 ~ -0.2%/V Test Method The resistance shall be measured at one-tenth the RCWV and at full RCWV. Application of voltages shall be momentary to minimize heating effects. The resistance - voltage coefficient shall be calculated with the following formula: Voltage Coefficient = (R-r) x 100 Percent Per Volt r x 0.9 (RCWV) Where: R is the resistance at full RCWV r is the resistance at one-tenth RCWV 4 Short Time Overload Within (2% + 0.05 ohm) A well regulated DC or sine wave RMS voltage 2.5 times the RCWV, but not exceeding the limit values listed in Table 1, shall be applied for 5 seconds. Resistance shall be measured before and approximately 30 minutes after the application of the test voltage. Test Item Tensile Strength Bending Strength Lead wire (D) (mm) O 0.6, 0.7 O 0.8 10N 20N (1.02kgf) (2.04kgf) 0.51kgf ------- ------- 1.02kgf Test Method 30 5 sec 5N (0.5kgf) 10N (1.02kgf) 5 Terminal Strength (Method 211) Resistance change shall be (1% + 0.05 ohm) of the Pre-test value, with no terminal loosening, and lead-wire breakdown developing. 6 Vibration (Method 201) Resistance change shall be (2% + 0.05 ohm) of the Pre-test value, with no terminal loosening and lead-wire breakdown developing. Initial resistance shall be measured. The frequency shall be varied approximately logarithmically between the nominal limits of 10 to 55 Hertz with a return sweep to 10 Hertz shall be traversed in approximately 1 minute. This sweep cycle shall be performed repeatedly for 2 hours in each three directions to perpendicular. Final measurements and examination for mechanical failures shall be made after the test. Initial resistance shall be measured. Resistor leads shall then be immersed, one at a time for 3.5 0.5 sec. each, in molten solder at +350C 10C to a distance of 2 - 2.5mm from the resistor body. Final resistance shall be measured 2 1 hr. after the immersions. 7 Resistance to soldering heat (Method 210) Resistance change shall be (2% + 0.05 ohm) of the Pre-test value with no mechanical damage in appearance and marking. PAGE 3 OF 6 Bolivar Drive P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. KOA SPEER ELECTRONICS, INC. SS-02 R6 5. Characteristics (Continued) 8 Solderability (Method 208) Over 3/4th of the leadwire surface area shall be covered with solder, when judged visually. The lead-wire is immersed for 2 - 3 seconds in methanol solution containing rosin body is immersed in melted solder at temperature of 235 5C for a period of 3 0.5 sec. as far as the point 2 - 2.5mm from the resistor body. 1. Sample shall be immersed in ultrasonic solvents of 28kHz frequency, 150w (0.3w/cm2) power at 35 5C for 2 minutes. 2. After samples shall be immersed in specified solvents (following table) for 3 minutes, the resistor shall be immediately wiped with a dry cloth (velvet or gauze) (Solvents) 1. Iso-proryle alcohol 2. 1-1-1 trichloroethane The resistors shall be clamped in the trough of a 90C metallic V-block of such size that the resistor body does not extend beyond the ends of the trough. The resistor leads shall be positioned such that they are no closer to the V-block than if they were parallel to the sides of the V-block. This prevents unnecessary proximity of the leads to the block, while permitting complete seating of the resistor body in the block. Sine wave RMS voltages from an alternating current supply at commercial line frequency not more than 100 Hertz as specified in Table 1 shall be applied at the rate of approximately 100 volts per second between resistor terminals connected together and the V-block, and held for 5 seconds. 9 Resistance to solvents No evidence of mechanical damage in appearance and marking. 10 Dielectric withstanding voltage (Method 301) The resistor develops no dielectric breakdown. Resistance change shall be (1% + 0.05 ohm) of the Pre-test value. 11 Flame-proof (UL-492-2) The coating cab withstand the overload test, with no possibilities of ignition. 1. Overload Test as per UL-492, Item 13: A piece of cotton cloth (A piece of gauze untreated corresponding to Nos 32-28 that measures 36 inches in width and 14 - 15 yards per pound) is wound around a resistor. Then, the resistor is applied with voltage which is increased by two times, three times, . . . ten times the rated voltage at intervals of one minute till the resistor is broken down. If the cotton cloth is found igniting, the resistor shall be considered unacceptable. The coating is completely proof against any kind of heat sources. Even if exposed to gas burner flames or heated red with nichrome wire wounded, the coating will not flame, nor soften and melt to drop. 2. Hot-wire Ignition Test as per UL-492-2, Item 9: A nichrome wire (Mixture of Cr 20% and Ni 80% which measures 0.0201 inches in diameter and 865 feet per pound, and having 1.61 ohm per foot) is wound a resistor at intervals of 1/4 inch so as to result in power consumption of 65W or more. Then, the resistor is heated red with electricity supplied to the nichrome wire. PAGE 4 OF 6 Bolivar Drive P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. KOA SPEER ELECTRONICS, INC. SS-02 R6 5. Characteristics (Continued) 12 Resistance to pulse Resistance change shall be 5% of the Pre-test value. Test circuit is shown below. 1 sec. on and 1 sec. off 20,000 cycles. The voltage is applied with maximum pulse voltage shown in Table 1. 10k ohm SW DC C = 1000pF Rx 13 Low Temperature Operation Resistance change shall be 5% of the Pre-test value. Initial resistance shall be measured. The resistors shall then be exposed to the air stream at -40C 3C for 24 hours with no voltage applied, after which the resistors shall be placed at room temperature, final resistance shall be measured. Initial resistance shall be measured. The resistors shall be subjected to the temperature cycle specified below for a total of five cycles, performed continuously. Temperatures in Steps 1 and 3 shall be maintained by forced air circulation. The hot and cold chambers shall be of such capacity that air temperature will reach the temperatures specified in Table 4 within 2 minutes after the resistors have been placed in the appropriate chamber. Final resistance shall be measured approximately one hour after completion of the fifth cycle. Thermal Shock Test Sequence Step Temperature (C) Time (min.) 1 -40 3 30 2 +25 5 10 ~ 15 3 +85 2 30 4 +25 5 10 ~ 15 14 Thermal Shock (Method 107) Resistance change shall be (2% 0.05 ohm) of the Pre-test value. 15 Moisture Resistance Resistance change shall be 5% of the Pre-test value. Initial resistance shall be measured before the test. Resistors shall be exposed to a temperature of 40 2C and a relative humidity of 90 - 95%, for 1,000 hours. After removal from the chamber, the resistors shall be allowed to dry at room ambient for approximately one hour. Final resistance shall be measured. PAGE 5 OF 6 Bolivar Drive P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. KOA SPEER ELECTRONICS, INC. SS-02 R6 5. Characteristics (Continued) 16 Moisture Life (Method 103) Resistance change shall be 5% of the Pre-test value. Initial resistance shall be measured. Resistors shall be placed in a chamber at relative humidity of 90 - 95% at ambient temperature of 40 2C. Then DC RCWV shall be applied intermittently 1-1/2 hr. (on), 1/2 hr. (off) for a total of 1,000 hrs. After removal from the chamber, the resistors shall be allowed to dry at room ambient for approximately 1 hr. Final resistance shall be measured. Initial resistance shall be measured. Resistors shall be placed at ambient temperature of 70 3C. Then DC RCWV shall be applied intermittently 1-1/2 hr. (on), 1/2 hr. (off) for a total of 1,000 hrs. After return to room temperature, final resistance shall be measured. 17 Operating Life (Method 108) Resistance change shall be 5% of the Pre-test value. 5.1 Derating Curve Under ambient temperature in excess of 70C, the load shall be derated as shown in the figure below. 100 80 % Rated Power 60 40 20 0 -60 -40 -20 0 20 40 60 80 100 120 140 160 180 200 70 Ambient Temperature (C) 5.2 Rated Voltage Resistors shall have a rated direct current (DC) continuous working voltage or an approximate sine wave rootmean square (rms) alternation-current (AC) continuous working voltage at commercial line frequency and wave form corresponding to the power rating, as determined from the following formula: Where, E = PxR E = Rated DC or rms AC continuous working voltage (V) P = Power rating (W) R = Nominal resistance (OHM) In no case shall the rated DC or rms AC continuous working voltage be greater than the applicable maximum value. 6. Marking The resistors shall be marked with color codes as per EIA-172. Bolivar Drive PAGE 6 OF 6 P.O. Box 547 Bradford, PA 16701 USA 814-362-5536 Fax 814-362-8883 www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. |
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