Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series MLA Varistor Series RoHS The MLA Series (also known as "ML" series) family of transient voltage surge suppression devices is based on the Littelfuse Multilayer fabrication technology. These components are designed to suppress a variety of transient events, including those specified in IEC 61000-4-2 or other standards used for Electromagnetic Compliance (EMC). The MLA Series is typically applied to protect integrated circuits and other components at the circuit board level. The wide operating voltage and energy range make the MLA Series suitable for numerous applications on power supply, control and signal lines. Size Table Metric EIA 1005 0402 1608 0603 2012 0805 3216 1206 3225 1210 The MLA Series is manufactured from semiconducting ceramics, and is supplied in a leadless, surface mount package. The MLA Series is compatible with modern reflow and wave soldering procedures. It can operate over a wider temperature range than Zener diodes, and has a much smaller footprint than plastichoused components. Littelfuse Inc. manufactures other multilayer series products. See the MLE Series data sheet for ESD applications, MHS Series data sheet for high-speed ESD applications, the MLN Series for multiline protection and the AUML Series for automotive applications. Applications • • • Suppression of inductive switching or other transient events such as EFT and surge voltage at the circuit board level ESD protection for IEC 61000-4-2, MIL-STD883c method 3015.7, and other industry specifications (see also the MLE or MLN Series) • • Used to help achieve electromagnetic compliance of end products Features Replace larger surface mount TVS Zeners in many applications Provides on-board transient voltage protection for ICS and transistors • RoHS compliant • • Leadless 0402, 0603, 0805, 1206 and 1210 chip sizes Rated for surge current (8 x 20μs) • Rated for energy (10 x 1000μs) • Multilayer ceramic construction technology • Inherent bi-directional clamping • -55°C to +125°C operating temp. range • Standard low capacitance types available • Operating voltage range VM(DC) = 5.5V to 120V Absolute Maximum Ratings For ratings of individual members of a series, see device ratings and specifications table. Continuous Steady State Applied Voltage: DC Voltage Range (VM(DC)) AC Voltage Range (VM(AC)RMS) Transient: Non-Repetitive Surge Current, 8/20μs Waveform, (ITM) Non-Repetitive Surge Energy, 10/1000μs Waveform, (WTM) Operating Ambient Temperature Range (TA) Storage Temperature Range (TSTG) Temperature Coefficient (DV) of Clamping Voltage (VC) at Specified Test Current © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. ML Series Units 3.5 to 120 2.5 to 107 V V 4 to 500 0.02 to 2.5 -55 to +125 -55 to +150 A J ºC ºC <0.01 %/º C 39 Revised: May 8, 2013 MLA Varistor Series MLA Series Description Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Device Ratings and Specifications Part Number V3.5MLA0603N5 V3.5MLA0805N V3.5MLA0805LN V3.5MLA1206N V5.5MLA0402N V5.5MLA0402LN V5.5MLA0603N5 V5.5MLA0603LN4 V5.5MLA0805N V5.5MLA0805LN V5.5MLA1206N V9MLA0402N V9MLA0402LN V9MLA0603N5 V9MLA0603LN4 V9MLA0805LN V12MLA0805LN V14MLA0402N V14MLA0603N V14MLA0805N V14MLA0805LN V14MLA1206N V18MLA0402N V18MLA0603N V18MLA0805N V18MLA0805LN V18MLA1206N V18MLA1210N V26MLA0603N V26MLA0805N V26MLA0805LN V26MLA1206N V26MLA1210N V30MLA0603N V30MLA0805LN V30MLA1210N V30MLA1210LN V33MLA1206N V42MLA1206N V48MLA1206N V48MLA1210N V48MLA1210LN V56MLA1206N V60MLA1210N V68MLA1206N V85MLA1210N V120MLA1210N NOTES: 1 2 3 4 5 Maximum Ratings (125º C) Specifications (25ºC) Maximum Maximum Non- Maximum Non- Maximum Clamping Nominal Voltage Typical Continuous repetitive Surge repetitive Surge Voltage at 1A (or as at 1mA DC Test Capacitance Working Voltage Current (8/20μs) Energy (10/1000μs) Noted) (8/20μs) Current at f = 1MHz VN(DC) VN(DC) VM(AC) ITM WTM VC C VM(DC) (V) 3.5 3.5 3.5 3.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 9.0 9.0 9.0 9.0 9.0 12.0 14.0 14.0 14.0 14.0 14.0 18.0 18.0 18.0 18.0 18.0 18.0 26.0 26.0 26.0 26.0 26.0 30.0 30.0 30.0 30.0 33.0 42.0 48.0 48.0 48.0 56.0 60.0 68.0 85.0 120.0 (V) 2.5 2.5 2.5 2.5 4.0 4.0 4.0 4.0 4.0 4.0 4.0 6.5 6.5 6.5 6.5 6.5 9.0 10.0 10.0 10.0 10.0 10.0 14.0 14.0 14.0 14.0 14.0 14.0 20.0 20.0 20.0 20.0 20.0 25.0 25.0 25.0 25.0 26.0 30.0 40.0 40.0 40.0 40.0 50.0 50.0 67.0 107.0 (A) 30 120 40 100 20 20 30 30 120 40 150 20 4 30 30 40 40 20 30 120 40 150 20 30 120 40 150 500 30 100 40 150 300 30 30 280 220 180 180 180 250 220 180 250 180 250 125 (J) 0.100 0.300 0.100 0.300 0.050 0.050 0.100 0.100 0.300 0.100 0.400 0.050 0.020 0.100 0.100 0.100 0.100 0.050 0.100 0.300 0.100 0.400 0.050 0.100 0.300 0.100 0.400 2.500 0.100 0.300 0.100 0.600 1.200 0.100 0.100 1.200 0.900 0.800 0.800 0.900 1.200 0.900 1.000 1.500 1.000 2.500 2.000 (V) 13.0 13.0 13.0 13.0 21.0 39.0 17.5 17.5 17.5 17.5 17.5 30.0 35.0 25.5 25.5 25.5 29.0 39.0 34.5 32.0 32.0 32.0 50.0 50.0 44.0 44.0 44.0 44.0 at 2.5 60.0 60.0 60.0 60.0 60.0 at 2.5 74.0 72.0 68.0 at 2.5 68.0 at 2.5 75.0 92.0 100 105.0 at 2.5 105.0 at 2.5 120.0 130.0 at 2.5 140.0 180.0 at 2.5 260.0 at 2.5 Min Max (V) 3.7 3.7 3.7 3.7 7.1 15.9 7.1 7.1 7.1 7.1 7.1 11.0 11.0 11.0 11.0 11.0 14.0 15.9 15.9 15.9 15.9 15.9 22.0 22.0 22.0 22.0 22.0 22.0 31.0 29.5 29.5 29.5 29.5 37.0 37.0 35.0 35.0 38.0 46.0 54.5 54.5 54.5 61.0 67.0 76.0 95.0 135.0 (V) 7.0 7.0 7.0 7.0 10.8 21.5 9.3 9.3 9.3 9.3 9.3 16.0 16.0 16.0 16.0 16.0 18.5 21.5 21.5 20.3 20.3 20.3 28.0 28.0 28.0 28.0 28.0 28.0 38.0 38.5 38.5 38.5 38.5 46.0 46.0 43.0 43.0 49.0 60.0 66.5 66.5 66.5 77.0 83.0 90.0 115.0 165.0 (pF) 1270 2530 1380 6000 220 70 500 450 1840 400 3500 120 33 490 360 520 410 70 180 560 320 1400 40 120 520 290 1270 1440 110 220 140 600 1040 90 90 1820 1760 500 425 350 520 500 180 440 100 260 80 'L' suffix is a low capacitance and energy version; Contact your Littelfuse sales representative for custom capacitance requirements Typical leakage at 25ºC<25μA, maximum leakage 100μA at VM(DC); for 0402 size, typical leakage <5μA, maximum leakage <20μA at VM(DC) Average power dissipation of transients for 0402, 0603, 0805, 1206 and 1210 sizes not to exceed 0.03W, 0.05W, 0.1W, 0.1W and 0.15W respectively Item is available as 'R' packing option only. All 0402 size items available as 'R' packaging option only. See Packaging section for additional information. Item is available in 'H','T'and 'A' packing option only. All 0805, 1206 and 1210 parts come as 'H','T'and 'A' packing option only. See Packaging section for additional information. MLA Varistor Series 40 Revised: May 8, 2013 © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Peak Current and Energy Derating Curve Peak Pulse Current Test Waveform for Clamping Voltage 100 PERCENT OF PEAK VALUE 50 0 T TIME PERCENT OF RATED VALUE O1 T1 Figure 2 100 80 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 60 40 20 0 -55 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( oC) Figure 1 Limit V-I Characteristic for V5.5MLA0402 to V18MLA0402 Limit V-I Characteristic for V9MLA0402L 100 10 Varistor Voltage (V) Varistor Voltage (V) 100 V18MLA0402 V14MLA0402 V9MLA0402 V5.5MLA0402 1 1μA T2 10μA 100μA 1mA 10mA 1A 10A Figure 3 V9MLA0402L V5.5MLA0402L 1 1μA 100A Current (A) 10 10μA 100μA Figure 4 Limit V-I Characteristic for V3.5MLA0603 to V30MLA0603 1mA 10mA 1A 10A 100A Current (A) Limit V-I Characteristic for V3.5MLA0805L to V30MLA0805L 1000 1000 V30MLA0805L V26MLA0805L V30MLA0603 V18MLA0805L V26MLA0603 Varistor Voltage (V) V18MLA0603 100 Varistor Voltage (V) V14MLA0603 10 V9MLA0603, V9MLA0603L 100 V14MLA0805L 10 V12MLA0805L V9MLA0805L V5.5MLA0603, V5.5MLA0603L V5.5MLA0805L V3.5MLA0603 V3.5MLA0805L 1 10μA Figure 5 1 10μA 100μA 1mA 10mA Current (A) 100mA 1A 10A © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. 100A Figure 6 41 Revised: May 8, 2013 100μA 1mA 10mA 100mA 1A 10A 100A Current (A) MLA Varistor Series MLA Series When transients occur in rapid succession, the average power dissipation is 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. For applications exceeding 125°C ambient temperature, the peak surge current and energy ratings must be derated as shown below. Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Limit V-I Characteristic for V3.5MLA0805 to V26MLA0805 Limit V-I Characteristic for V3.5MLA1206 to V68MLA1206 1000 100 100 Varistor Voltage (V) Varistor Voltage (V) 1000 V26MLA0805 10 V18MLA0805 V68MLA1206 V56MLA1206 V42MLA1206 V33MLA1206 V26MLA1206 V18MLA1206 V14MLA1206 V5.5MLA1206 V3.5MLA1206 10 V14MLA0805 V5.5MLA0805 V3.5MLA0805 1 10μA 100μA 1mA 10mA 100mA 1A 10A 100A 1000A Current (A) Figure 7 1 10μA 100μA 1mA 10mA 100mA Current (A) 1A 10A 100A 1000A Figure 8 Limit V-I Characteristic for V18MLA1210 to V120MLA1210 1000 MAXIMUM CLAMPING VOLTAGE MAXIMUM LEAKAGE Varistor Voltage (V) 100 V120MLA1210 10 V85MLA1210 V60MLA1210 V48MLA1210, V48MLA1210L V30MLA1210, V30MLA1210L V26MLA1210 1 10μA V18MLA1210 100μA Figure 9 MLA Varistor Series 1mA 10mA 100mA 1A 10A 100A 1000A CURRENT (A) 42 Revised: May 8, 2013 © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Clamping Voltage Over Temperature (VC at 10A) At low current levels, the V-I curve of the multilayer transient voltage suppressor approaches a linear (ohmic) relationship and shows a temperature dependent effect. At or below the maximum working voltage, the suppressor is in a high resistance modex (approaching 106Ω at its maximum rated working voltage). Leakage currents at maximum rated voltage are below 100μA, typically 25μA; for 0402 size below 20μA, typically 5μA. CLAMPING VOLTAGE (V) 100 V26MLA1206 V5.5MLA1206 Typical Temperature Dependance of the Haracteristic Curve in the Leakage Region 100% 10 -60 -40 Figure 11 VNOM VALUE AT 25 oC (%) SUPPRESSOR VOLTAGE IN PERCENT OF MLA Series Device Characteristics -20 0 20 40 60 80 TEMPERATURE ( oC) 100 120 140 Energy Absorption/Peak Current Capability 25 10% 1E -9 o 50o 75o 1E -8 100o 125 oC 1E -7 Figure 10 1E -6 1E -5 1E -4 1E -3 1E -2 SUPPRESSOR CURRENT (ADC) Speed of Response The Multilayer Suppressor is a leadless device. Its response time is not limited by the parasitic lead inductances found in other surface mount packages. The response time of the ZNO dielectric material is less than 1ns and the MLA can clamp very fast dV/dT events such as ESD. Additionally, in "real world" applications, the associated circuit wiring is often the greatest factor effecting speed of response. Therefore, transient suppressor placement within a circuit can be considered important in certain instances. Energy dissipated within the MLA Series is calculated by multiplying the clamping voltage, transient current and transient duration. An important advantage of the multilayer is its interdigitated electrode construction within the mass of dielectric material. This results in excellent current distribution and the peak temperature per energy absorbed is very low. The matrix of semiconducting grains combine to absorb and distribute transient energy (heat) (see Speed of Response). This dramatically reduces peak temperature; thermal stresses and enhances device reliability. As a measure of the device capability in energy and peak current handling, the V26MLA1206A part was tested with multiple pulses at its peak current rating (150A, 8/20μs). At the end of the test,10,000 pulses later, the device voltage characteristics are still well within specification. Repetitive Pulse Capability Multilayer Internal Construction 100 PEAK CURRENT = 150A 8/20 s DURATION, 30s BETWEEN PULSES FIRED CERAMIC DIELECTRIC VOLTAGE V26MLA1206 METAL ELECTRODES METAL END TERMINATION 10 DEPLETION 0 REGION Figure 13 2000 4000 6000 8000 10000 12000 NUMBER OF PULSES DEPLETION REGION Figure 12 GRAINS © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. 43 Revised: May 8, 2013 MLA Varistor Series Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA 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 MAXIMUM TEMPERATURE 230°C The recommended solder for the MLA suppressor is a 62/36/2 (Sn/Pb/Ag), 60/40 (Sn/Pb) or 63/37 (Sn/Pb). Littelfuse also recommends an RMA solder flux. TEMPERATURE °C 200 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. When using a reflow process, care should be taken to ensure that the MLA 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. 40-80 SECONDS ABOVE 183°C 150 RAMP RATE <2°C/s 100 PREHEAT DWELL 50 PREHEAT ZONE 0 Figure 14 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 TIME (MINUTES) Wave Solder Profile 300 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 50º C before cleaning. MAXIMUM WAVE 260°C TEMPERATURE °C 250 200 150 SECOND PREHEAT 100 FIRST PREHEAT 50 0 0.0 0.5 1.0 1.5 Figure 15 2.0 2.5 3.0 TIME (MINUTES) 3.5 4.0 4.5 Lead–free (Pb-free) Soldering Recommendations Littelfuse offers the Nickel Barrier Termination option (see "N" suffix in Part Numbering System for ordering) for the optimum Lead–free solder performance, consisting of a Matte Tin outer surface plated on Nickel underlayer, plated on Silver base metal. Lead–free Re-flow Solder Profile 300 MAXIMUM TEMPERATURE 260˚C, TIME WITHIN 5˚C OF PEAK 20 SECONDS MAXIMUM 250 TEMPERATURE °C The preferred solder is 96.5/3.0/0.5 (SnAgCu) with an RMA flux, but there is a wide selection of pastes and fluxes available with which the Nickel Barrier parts should be compatible. 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. MLA Varistor Series RAMP RATE <3˚C/s 200 60 - 150 SEC > 217˚C 150 100 PREHEAT ZONE 50 0 0 Figure 16 44 Revised: May 8, 2013 1.0 2.0 3.0 4.0 5.0 6.0 7.0 TIME (MINUTES) © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Product Dimensions (mm) PAD LAYOUT DIMENSIONS CHIP LAYOUT DIMENSIONS C E B D MLA Series NOTE L W A NOTE : Avoid metal runs in this area, parts not recommended for use in applications using Silver (Ag) epoxy paste. 1210 Size Dimension 1206 Size IN MM IN MM A 0.160 B 0.100 4.06 0.160 2.54 0.065 0805 Size 0603 Size IN MM 4.06 0.120 1.65 0.050 0402 Size IN MM IN MM 3.05 0.100 2.54 0.067 1.70 1.27 0.030 0.76 0.020 0.51 C 0.040 1.02 0.040 1.02 0.040 1.02 0.035 0.89 0.024 0.61 D (max.) 0.113 2.87 0.071 1.80 0.043 1.10 0.040 1.00 0.024 0.60 E 0.020 -/+0.010 0.50 -/+0.25 0.020 -/+0.010 0.50 -/+0.25 0.020 -/+ 0.010 0.50 -/+ 0.25 0.015 -/+0.008 0.4 -/+0.20 0.010 -/+0.006 0.25 -/+0.15 L 0.125 -/+0.012 3.20 -/+0.30 0.125 -/+0.012 3.20 -/+0.30 0.079 -/+0.008 2.01 -/+0.20 0.063 -/+0.006 1.6 -/+0.15 0.039 -/+0.004 1.00 -/+0.10 W 0.100 -/+0.012 2.54 -/+0.30 0.060 -/+0.011 1.60 -/+0.28 0.049 -/+0.008 1.25 -/+0.20 0.032 -/+0.060 0.8 -/+0.15 0.020 -/+0.004 0.50 -/+0.10 Part Numbering System V 18 MLA 1206 X X X PACKING OPTIONS (see Packaging table for quantities) T: 13in (330mm) Diameter Reel, Plastic Carrier Tape H: 7in (178mm) Diameter Reel, Plastic Carrier Tape R: 7in (178mm) Diameter Reel, Paper Carrier Tape A: Bulk Pack DEVICE FAMILY Littelfuse TVSS Device MAXIMUM DC WORKING VOLTAGE END TERMINATION OPTION No Letter: Standard N: Nickel Barrier Option (Matte Tin outer surface, plated on Nickel underlayer plated on silver base metal) CAPACITANCE OPTION No Letter: Standard L: Low Capacitance Version MULTILAYER SERIES DESIGNATOR DEVICE SIZE: 0201 = .024 inch x .012 inch (0.6 mm x 0.3 mm) 0402 = .04 inch x .02 inch (1.0 mm x 0.5 mm) 0603 = .063 inch x .031 inch (1.6 mm x 0.8 mm) 0805 = .08 inch x .08 inch (2.0 mm x 1.25 mm) 1206 = .126 inch x .063 inch (3.2 mm x 1.6 mm) 1210 = .126 inch x .1 inch (3.2 mm x 2.5 mm) *NOTES: 1 V120MLA1210 standard shipping quantities are 1000 pieces per reel for the "H" option and 4000 pieces per reel for "T" option. 2 V3.5 MLA0603, V5.5MLA0603 and V9MLA0603 only available in "H," "T" and "A" packing options. Packaging* Quantity Device Size 13” Inch Reel ("T" Option) 7” Inch Reel ("H" Option) 7” Inch Reel ("R" Option) Bulk Pack ("A" Option) 1210 1206 0805 0603 0402 8,000 10,000 10,000 10,000 N/A 2,000 2,500 2,500 2,500 N/A N/A N/A N/A 4,000 10,000 2,000 2,500 2,500 2,500 N/A *(Packaging) 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. 45 © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Revised: May 8, 2013 Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information. MLA Varistor Series Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLA Series Tape and Reel Specifications D0 PRODUCT IDENTIFYING LABEL P0 For T and H Pack Options: PLASTIC CARRIER TAPE For R Pack Options: EMBOSSED PAPER CARRIER TAPE P2 E F K0 W B0 t1 D1 P1 Symbol EMBOSSMENT TOP TAPE A0 8mm NOMINAL 178mm OR 330mm DIA. REEL Dimensions in Millimeters Description 0402 Size 0603, 0805, 1206 & 1210 Sizes A0 Width of Cavity Dependent on Chip Size to Minimize Rotation. B0 Length of Cavity Dependent on Chip Size to Minimize Rotation. K0 Depth of Cavity Dependent on Chip Size to Minimize Rotation. W Width of Tape 8 -/+0.2 8 -/+0.3 F Distance Between Drive Hole Centers and Cavity Centers 3.5 -/+0.05 3.5 -/+0.05 E Distance Between Drive Hole Centers and Tape Edge 1.75 -/+0.1 1.75 -/+0.1 P1 Distance Between Cavity Centers 2-/+0.05 4 -/+0.1 P2 Axial Drive Distance Between Drive Hole Centers & Cavity Centers 2 -/+0.1 2 -/+0.1 P0 Axial Drive Distance Between Drive Hole Centers D0 Drive Hole Diameter D1 Diameter of Cavity Piercing T1 Top Tape Thickness 4 -/+0.1 4 -/+0.1 1.55 -/+0.05 1.55 -/+0.05 N/A 1.05 -/+0.05 0.1 Max 0.1 Max NOTES: • Conforms to EIA-481-1, Revision A • Can be supplied to IEC publication 286-3 MLA Varistor Series 46 Revised: May 8, 2013 © 2013 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.