Varistor Products Surface Mount Varistors > CH Series RoHS CH Varistor Series Description CH Series varistors are available in a voltage range from 14V to 275V (VM(AC)RMS), and energy ratings up to 8J. See the Littelfuse Multilayer Suppressor Series also. Agency Approvals Features Recognized under the components program of Underwriters Laboratories. AGENCY t -FBEoGSFF t -FBEMFTTTVSGBDF mount chip in 5 x 8mm Size AGENCY FILE NUMBER UL E320116 t 4VQQMJFEJOUBQFBOE reel or bulk pack t /PEFSBUJOHVQUP 125ºC ambient t 7PMUBHFSBUJOHT VM(AC)RMS 14V to 275V Absolute Maximum Ratings t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU Continuous CH Series Units Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) 14 to 275 V DC Voltage Range (VM(DC)) 18 to 369 V 100 to 250 A Transient: Peak Pulse Current (ITM) For 8/20μs Current (See Figure 2) Single Pulse Energy Range 1.0 to 8.0 J Operating Ambient Temperature Range (TA) For 10/1000μs Current Wave (WTM) -55 to +125 ºC Storage Temperature Range (TSTG) -55 to +150 ºC <0.01 %/ºC Temperature Coefficient (DV) of Clamping Voltage (VC) at Specified Test Current 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. ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information. CH Varistor Series Revision: August 30, 2010 CH Series CH Series transient surge suppressors are small, metal-oxide varistors (MOVs) manufactured in leadless chip form. They are intended for use in a variety of applications from low voltage DC to off-line board-level protection. These devices, which have significantly lower profiles than traditional radial lead varistors, permit designers to reduce the size and weight and increase the reliability of their equipment designs. Varistor Products Surface Mount Varistors > CH Series Device Ratings and Specifications Maximum Ratings (125ºC) Continuous Part Number Specifications (25ºC) Varistor Voltage at 1 mA DC Max Clamping Volt VC at Test Current (8/20μs) Test Current Transient Typical Capacitance VRMS VDC VM(AC) VM(DC) Energy (10/1000μ s) WTM Peak Current (8/20μs) ITM (V) (V) (J) MIN VN(DC) MAX VC IP f=1MHz (A) (V) (V) (V) (V) (A) (pF) V22CH8 14 18 (Note 3) 1.0 (Note2) 100 18.7 22.0 26.0 47 5 1600 V27CH8 17 22 1.0 100 23.0 27.0 31.1 57 5 1300 V33CH8 20 26 1.0 100 29.5 33.0 36.5 68 5 750 V39CH8 25 31 1.0 100 35.0 39.0 43.0 79 5 700 V47CH8 30 38 1.2 100 42.0 47.0 52.0 92 5 650 V56CH8 35 45 1.4 100 50.0 56.0 62.0 107 5 600 V68CH8 40 56 1.5 100 61.0 68.0 75.0 127 10 500 V120CH8 75 102 2.0 250 108.0 120.0 132.0 200 10 300 V150CH8 95 127 3.0 250 135.0 150.0 165.0 250 10 250 V180CH8 115 153 4.0 250 162.0 180.0 198.0 295 10 120 V200CH8 130 175 4.0 250 184.0 200.0 228.0 340 10 110 V220CH8 140 180 5.0 250 198.0 220.0 242.0 360 10 105 V240CH8 150 200 5.0 250 212.0 240.0 268.0 395 10 100 V360CH8 230 300 6.0 250 324.0 360.0 396.0 595 10 70 V390CH8 250 330 7.0 250 354.0 390.0 429.0 650 10 60 V430CH8 275 369 8.0 250 389.0 430.0 473.0 710 10 50 NOTES: 1. Power dissipation of transients not to exceed 0.25W. 2. Energy rating for impulse duration of 30ms minimum to one half of peak current value. 3. Also rated to withstand 24V for 5 minutes. 4. All Littelfuse CH Series Varistors are recognized under UL file #E320116 as a recognized component. 5. The Typical Capacitance is for reference only Current, Energy and Power Derating Curve 100 PERCENT OF RATED VALUE Continuous power dissipation capability is not an applicable design requirement for a suppressor, unless transients occur in rapid succession. Under this condition, 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 tempera tures as shown in this diagram. 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 Figure 1 CH Varistor Series Revision: August 30, 2010 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( oC) ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information. Varistor Products Surface Mount Varistors > CH Series PERCENT OF PEAK VALUE Peak Pulse Current Test Waveform 01 = Virtual Origin of Wave T = Time from 10% to 90% of Peak T1 = Rise Time = 1.25 x T T2 = Decay Time Example: For an 8/20 μs Current Waveform: 8μs = T1 = Rise Time 20μs = T2 = Decay Time 100 90 50 10 T TIME T1 Figure 2 T2 Clamping Voltage for V22CH8 – V68CH8 Clamping Voltage for V120CH8 – V430CH8 4,000 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 22 TO 56VN(DC) RATING TA = -55oC TO 125 oC 200 100 90 80 70 60 50 40 V68CH8 V56CH8 V47CH8 V39CH8 V33CH8 V27CH8 V22CH8 30 20 10 10 -3 10 -2 10 -1 10 0 10 1 10 2 2,000 1,000 900 800 700 600 500 400 V240CH8 V220CH8 V200CH8 V430CH8 V390CH8 V360CH8 300 200 V180CH8 V150CH8 V120CH8 100 10 -3 10 3 PEAK AMPERES (A) Figure 3 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 100 TO 430VN(DC) RATING TA = -55oC TO 125 oC 3,000 MAXIMUM PEAK VOLTS (V) MAXIMUM PEAK VOLTS (V) 500 400 300 CH Series O1 10 -2 10 -1 Figure 4 10 0 10 1 10 2 PEAK AMPERES (A) 10 3 10 4 Pulse Rating Curves Surge Current Rating Curves for V22CH8 - V56CH8 2,000 1 200 2 100 10 50 10 2 MODEL SIZE 5 x 8mm V22CH8 - V56CH8 10 5 INDEFINITE 0.5 Figure 5 10 2 10 3 10 4 10 5 2 200 10 100 50 20 10 10 6 5 1 0.2 20 1 500 10 4 10 5 10 6 10 3 2 MODEL SIZE 5 x 8mm V120CH8 - V430CH8 1,000 SURGE CURRENT (A) SURGE CURRENT (A) 500 20 Surge Current Rating Curves for V120CH8 - V430CH8 INDEFINITE 2 1 100 1,000 IMPULSE DURATION (μs) 10,000 Figure 6 20 100 1,000 10,000 IMPULSE DURATION (μs) 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 ample protection. ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information. CH Varistor Series Revision: August 30, 2010 Varistor Products Surface Mount Varistors > CH Series Lead (Pb) Soldering Recommendations The principal techniques used for the soldering of components in surface mount technology are IR Re-flow and Wave soldering. Typical profiles are shown on the right. Reflow Solder Profile 250 When using a reflow process, care should be taken to ensure that the CH chip is not subjected to a thermal gradient steeper than 4 degrees per second; the ideal gradient being 2 degrees per second. During the soldering process, preheating to within 100 degrees of the solder's peak temperature is essential to minimize thermal shock. Once the soldering process has been completed, it is still necessary to ensure that any further thermal shocks are avoided. One possible cause of thermal shock is hot printed circuit boards being removed from the solder process and subjected to cleaning solvents at room temperature. The boards must be allowed to cool gradually to less than 50ºC before cleaning. TEMPERATURE °C Wave soldering is the most strenuous of the processes. To avoid the possibility of generating stresses due to thermal shock, a preheat stage in the soldering process is recommended, and the peak temperature of the solder process should be rigidly controlled. MAXIMUM TEMPERATURE 230°C 200 40-80 SECONDS ABOVE 183°C 150 RAMP RATE <2°C/s 100 PREHEAT DWELL 50 0 PREHEAT ZONE 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 TIME (MINUTES) Figure 7 Wave Solder Profile 300 MAXIMUM WAVE 260°C 250 TEMPERATURE °C CH series devices have silver-platinum terminals (Ag/Pt), and the recommended solder is 62/36/2 (Sn/Pb/Ag), 60/40 (Sn/Pb) or 63/37 (Sn/Pb). Littelfuse also recommends an RMA solder flux. 200 150 SECOND PREHEAT 100 FIRST PREHEAT 50 0 0.0 0.5 1.0 1.5 Figure 8 2.0 2.5 3.0 TIME (MINUTES) 3.5 4.0 4.5 Lead–free (Pb-free) Soldering Recommendations The reflow profile must be constrained by the maximums in the Lead–free Reflow Profile. For Lead–free Wave soldering, the Wave Solder Profile still applies. Note: the Lead–free paste, flux and profile were used for evaluation purposes by Littelfuse, based upon industry standards and practices. There are multiple choices of all three available, it is advised that the customer explores the optimum combination for their process as processes vary considerably from site to site. Lead–free Re-flow Solder Profile 300 MAXIMUM TEMPERATURE 260˚C, TIME WITHIN 5˚C OF PEAK 20 SECONDS MAXIMUM 250 TEMPERATURE °C CH series devices have silver-platinum terminals (Ag/Pt), and the recommended Lead-free solder is 96.5/3.0/0.5 (SnAgCu) with an RMA flux, though there is a wide selection of pastes and fluxes available that should be compatible. RAMP RATE <3˚C/s 200 60 - 150 SEC > 217˚C 150 100 PREHEAT ZONE 50 0 Figure 9 CH Varistor Series Revision: August 30, 2010 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 TIME (MINUTES) ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information. Varistor Products Surface Mount Varistors > CH Series Part Numbering System V 220 CH 8 X PACKAGING OPTIONS No Letter: Standard 13 Inch Reel T: 7 Inch Reel S: Bulk Pack RELATIVE SIZE INDICATOR LITTELFUSE VARISTOR NOMINAL VARISTOR VOLTAGE SERIES DESIGNATOR Dimensions Symbol C NOTE 1 Min Max Millimeters Min Max 0.402 10.210 B 0.216 5.500 C 0.087 2.210 A B A Inches CH Series PAD LAYOUT DIMENSIONS D - 0.080 - 2.03 E 0.016 0.050 0.41 1.27 L 0.311 0.335 7.90 8.51 W 0.185 0.207 4.70 5.26 NOTE: Avoid metal runs in this area. Soldering recommendations: Material - 62/36/2 Sn/Pb/ Ag or equivalent.Temperature – 230ºC Max., 5s. Max. Flux - R.M.A. CHIP LAYOUT DIMENSIONS E L D W ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information. CH Varistor Series Revision: August 30, 2010 Varistor Products Surface Mount Varistors > CH Series Tape and Reel Specifications Symbol P0 E W P P2 F K0 D SECTION THRU CAVITY B0 A0 D1 PLAN VIEW OF STRIP T1 T H0 B0 R1 R2 K0 R3 A0 8.5 -/+ 0.1 A0 Cavity Width 5.5 -/+ 0.1 K0 Cavity Depth 2.0 Min. H0 Ref. Plane for A0 and B0 R1, R2, R3 K R4 MINIMUM BENDING RADIUS REELED RADIUS DETAILS Size (mm) Cavity Length T CROSS SECTION (REF. PLANE FOR A 0 & B0) Parameter B0 Tape Cavity Radii + 0.10 0.3 - 0.05 0.5 Max. T Carrier Tape Thickness 1.0 Max. T1 Cover Tape Thickness 0.1 Max. E Sprocket Hole from Edge 1.75 -/+ 0.1 P0 Sprocket Hole Pitch 4.0 -/+ 0.1 D Sprocket Hole Diameter P2 Hole Centre to Component Centre + 0.1 1.5 - 0.0 2.0 -/+ 0.15 R4 Min. Bending Radius D1 Ejection Hole Diameter 1.5 Min. K Overall Thickness 3.0 Min. P Pitch Of Component 8.0 -/+ 0.1 F Sprocket Hole to Ejection Hole 7.5 -/+ 0.1 W Carrier Tape Width CAVITY DETAILS 30.5 Min. 16.0 -/+ 0.3 Notes : t$POGPSNTUP&*"3FWJTJPO" t$BOCFTVQQMJFEUP*&$1VCMJDBUJPO Standard Packaging* Special Packaging CH Series varistors are always shipped in tape and reel. The standard 13-inch reel utilized contains 4000 pieces. Option 1 Note also that the CH Series receives no branding on the chip itself. Option 2 *NOTE: It is recommended that parts be kept in the sealed bag provided and that parts be used as soon as possible when removed from bags. CH Varistor Series Revision: August 30, 2010 7-inch reels containing 1000 pieces are available. To order 7-inch reels add a 'T' suffix to the part number; e.g., V47CH8T. For small quantities (less than 100 pieces) the units are shipped bulk pack. To order, add a 'S' suffix to the part number; e.g., V47CH8S. ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/CH.html for current information.