Varistor Products Base Mount PA Varistor Series ® The PA Series of transient surge suppressors are metal-oxide varistors (MOVs) featuring a rigid base mount package construction, and are useful in applications which are subject to vibration. These UL and CSA recognized varistors are available in a wide range of operating voltages, from 130V to 660V VM(AC)RMS . The base-mount package has a quick-connect tab terminal that provides a fast, secure lead attach. The mounting base forms the second electrical connection, usually chassis ground. Meeting rigid NEMA standards, PA series varistors have a creep and strike distance capability that minimizes breakdown along the package surface. See PA Series Device Ratings and Specifications table for part number and brand information. Features • Wide Operating Voltage Range VM(AC)RMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130V to 660V • Creep and Strike Distance Capability Meets Rigid NEMA Standards • Base Mount Construction Forms One Electrical Connection • Quick Connect Tab Terminal • No Derating Up to 85oC Ambient AGENCY APPROVALS: Recognized under the components program of Underwriters Laboratories. Certified by CSA. AGENCY FILE NUMBERS: UL E75961, CSA LR91788. 132 w w w. l i t t e l f u s e . c o m ® Varistor Products Base Mount PA Varistor Series For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous: PA SERIES Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 660 DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 to 850 Transient: Peak Pulse Current (ITM) For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6500 Single Pulse Energy Range For 10/1000µs Current Wave (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 to 250 Operating Ambient Temperature Range (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 UNITS V V A J C O C %/OC O CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Device Ratings and Specifications MAXIMUM RATINGS (85 oC) CONTINUOUS SPECIFICATIONS (25 oC) TRANSIENT PEAK CURRENT (8/20µs) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLT V C AT TEST CURRENT (8/20µs) TYPICAL CAPACITANCE VRMS VDC ENERGY (10/1000µs) VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VC IP f = 1MHz (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF) V130PA20A 130 175 70 6500 184 200 243 360 100 1900 V130PA20C 130 175 70 6500 184 200 220 325 100 1900 V150PA20A 150 200 80 6500 212 240 284 420 100 1600 V150PA20C 150 200 80 6500 212 240 243 360 100 1600 V250PA40A 250 330 130 6500 354 390 453 675 100 1000 V250PA40C 250 330 130 6500 354 390 413 620 100 1000 V275PA40A 275 369 140 6500 389 430 494 740 100 900 V275PA40C 275 369 140 6500 389 430 453 680 100 900 V320PA40A 320 420 160 6500 462 510 565 850 100 750 V320PA40C 320 420 160 6500 462 510 540 800 100 750 V350PA40A 350 460 165 6500 500 559 618 910 100 700 V350PA40C 350 460 165 6500 500 535 570 840 100 700 V420PA40A 420 560 170 6500 610 680 790 1160 100 600 V420PA40C 420 560 170 6500 610 680 690 1050 100 600 V480PA80A 480 640 180 6500 670 750 860 1280 100 550 V480PA80C 480 640 180 6500 670 750 790 1160 100 550 V510PA80A 510 675 190 6500 735 820 963 1410 100 500 V510PA80C 510 675 190 6500 735 820 860 1280 100 500 V575PA80A 575 730 220 6500 805 910 1050 1560 100 450 V575PA80C 575 730 220 6500 805 910 960 1410 100 450 V660PA100A 660 850 250 6500 940 1050 1210 1820 100 400 PART NUMBER AND DEVICE BRANDING w w w. l i t t e l f u s e . c o m 133 2 VARISTOR PRODUCTS Absolute Maximum Ratings Varistor Products Base Mount PA Varistor Series Power Dissipation Ratings 100 PERCENT OF RATED VALUE Should transients occur in rapid succession, the average power dissipation required is simply the energy (watt-seconds) per pulse times the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings and Specifications table for the specific device. Furthermore, the operating values need to be derated at high temperatures as shown in Figure 1. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( oC) PERCENT OF PEAK VALUE FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE 100 O1 = Virtual Origin of Wave T = Time From 10% to 90% of Peak T1 = Virtual Front time = 1.25 • t T2 = Virtual Time to Half Value (Impulse Duration) Example: For an 8/20µs Current Waveform: 8µs = T1 = Virtual Front Time 20µs = T2 = Virtual Time to Half Value 90 50 10 O1 T TIME T1 T2 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM Transient V-I Characteristics Curves MAXIMUM PEAK VOLTS (V) 4,000 3,000 6,000 5,000 MAXIMUM CLAMPING VOLTAGE V660PA80A “A” SUFFIX V575PA80A 130 TO 660VM(AC) RATING V510PA80A o o TA = -55 C TO 85 C V480PA80A V420PA80A 2,000 1,000 900 A40A 800 700 600 500 V320PA40A 400 V150PA20A 300 V130PA20A 200 -3 10 10-2 V275PA40A V250PA40A 100 101 102 PEAK AMPERES (A) 103 FIGURE 3. CLAMPING VOLTAGE FOR V130PA20A V660PA100A 134 3,000 104 V660PA100C V575PA80C V510PA80C V480PA80C V420PA80C 2,000 1,000 900 800 700 V350PA40C 600 500 400 V320PA40C 300 10-1 MAXIMUM CLAMPINGVOLTAGE “C”SUFFIX 130 TO 660VM(AC) RATING TA = -55oC TO 85oC 4,000 MAXIMUM PEAK VOLTS (V) 6,000 5,000 V275PA40C V250PA40C V150PA20C V130PA20C 200 10-3 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 FIGURE 4. CLAMPING VOLTAGE FOR V130PA20C V660PA100C w w w. l i t t e l f u s e . c o m 104 Varistor Products Base Mount PA Varistor Series Pulse Rating Curves 1 2 DISC SIZE 20mm V130PA20A -V320PA40C 10 103 SURGE CURRENT (A) 500 200 100 50 20 INDEFINITE 10 2 DISC SIZE 20mm V420PA40A -V660PA100C 10 102 3 10 104 105 106 2,000 104 105 106 1,000 1 5,000 102 2,000 SURGE CURRENT (A) 10,000 1,000 500 2 200 VARISTOR PRODUCTS 10,000 5,000 100 50 20 INDEFINITE 10 5 5 2 2 1 20 100 1,000 1 10,000 20 100 IMPULSE DURATION ( µs) FIGURE 5. SURGE CURRENT RATING CURVES FOR V130PA20A - V320PA40C 1,000 IMPULSE DURATION ( µs) 10,000 FIGURE 6. SURGE CURRENT RATING CURVES FOR V420PA40A - V660PA100C NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than ±10% could result.This type of shift, which normally results in a decrease of VN(DC), may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide transient protection Mechanical Dimensions H1, 2, 3 D A Q J b2 S SEATING PLANE C F B TC ØP 2 HOLES h E b b3 T ØD1 ØT TAB NOTES: 1. Tab is designed to fit 1/4” quick-connect terminal. 2. Case temperature is measured at TC on top surface of base plate. MILLIMETERS INCHES SYMBOL MIN NOM MAX MIN NOM A - - 14.3 - - 0.570 - b - - 6.6 - - 0.260 1 MAX NOTES b2 3.94 4.06 4.18 0.155 0.160 0.165 - b3 3.05 3.17 3.29 0.120 0.125 0.130 - - 0.510 - B - - C - - 6.6 - - 0.260 - D - - 66.3 - - 2.610 - ØD1 - - 33.5 - - 1.320 - - 11.2 - - E F 7.50 12.9 - 0.440 - - 7.62 7.75 0.295 0.300 0.305 - h - 0.8 1.0 - 0.030 0.040 - 3. H1 (130-150VRMS devices). H2 (250-320VRMS devices). H3 (420-660VRMS devices). H1 - - 25.6 - - 1.010 3 H2 - - 28.3 - - 1.120 3 4. Electrical connection: top terminal and base plate. H3 - - 32.8 - - 1.290 3 J - - 8.1 - - 0.320 - 5. Typical weight: 30g. ØP 5.6 - 6.0 0.220 - 0.240 - Q 50.6 50.8 51.0 1.990 2.000 2.010 - S 18.4 19.2 20.0 0.72 0.75 0.78 - T - - 1.0 - - 0.040 - ØT 2.8 - - 0.110 - - - TC - 3.2 - - 0.126 - 2 w w w. l i t t e l f u s e . c o m 135 Varistor Products Base Mount PA Varistor Series Suggested Hardware and Mounting Arrangements TYPICAL NON-ISOLATED MOUNTING TYPICAL ISOLATED MOUNTING #10-32 PAN HEAD SCREW #6-32 SCREW THERMAL GREASE LAYER #6 FLAT WASHER PHENOLIC SHOULDER WASHER SPACER THERMAL QUICK CONNECT #10 FLAT WASHER VARISTOR MOUNTING SURFACE LOCK WASHER (NOTE 6) THERMAL GREASE LAYER #10-32 NUT VARISTOR MICA INSULATOR MOUNTING SURFACE LOCK WASHER #6-32 NUT NOTE: 6. GE G623, Dow Corning, DC3, 4, 340, or 640 Thermal Grease recommended for best heat transfer. 1,000V Isolation Kit containing the following parts can be ordered by part #A7811055 (Qty). (1) MICA insulation 1”/3.1”/0.005” thick (2) Phenolic shoulder washer (2) #6-32/3 / 4 screw (2) #6 internal tooth lock washer (1) 1/4 ” quick-connect terminal (1) Spacer (2) #6-32 nut (2) #6 flat washer Ordering Information V XXX PA XX X VARISTOR CLAMPING VOLTAGE SELECTION DESIGNATOR A = Standard C = Low Clamp Voltage Option VM(AC) 130V to 660V RELATIVE ENERGY INDICATOR SERIES DESIGNATOR 136 w w w. l i t t e l f u s e . c o m