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Varistor Products
Surface Mount Multilayer Varistors (MLVs) > ML Series
RoHS
ML Varistor Series
Description The 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 ML Series is typically applied to protect integrated circuits and other components at the circuit board level.
Size Table
Metric 1005 1608 2012 0805 1206 1210 EIA 0402
The ML Series is manufactured from semiconducting ceramics, and is supplied in a leadless, surface mount package. The ML 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.
electromagnetic compliance of end products mount TVS Zeners in many applications
Applications
switching or other transient events such as EFT and surge voltage at the circuit board level 61000-4-2, MIL-STDand other industry specifications (see also the MLE or MLN Series) transient voltage protection for ICS and transistors
Features
current (8 x 20s) (10 x 1000s) clamping packaging assures better than UL94V-0 flammability rating types available
RoHS compliant 0805, 1206 and 1210 chip sizes construction technology operating temp. 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, 8/20s Waveform, (ITM) Non-Repetitive Surge Energy, 10/1000s Waveform, (WTM) ) A Storage Temperature Range (TSTG) Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information. 37 Revision: July 16, 2009
ML Series
Units V V
4 to 500 0.02 to 2.5
A J C C %/ C
ML Varistor Series
<0.01
ML Series
The wide operating voltage and energy range make the ML Series suitable for numerous applications on power supply, control and signal lines.
Surface Mount Multilayer Varistors (MLVs) > ML Series
Varistor Products
Device Ratings and Specifications
Maximum Ratings (125 C) Specifications (25C) 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 (8/20s) Energy (10/1000s) Noted) (8/20s) Current at f = 1MHz VN(DC) VN(DC) VM(DC) VM(AC) ITM WTM VC C Min Max (V) (V) (A) (J) (V) (V) (V) (pF) 2.5 0.100 2.5 120 2.5 40 0.100 2.5 100 6000 5.5 4.0 20 0.050 21.0 10.8 220 5.5 4.0 20 0.050 15.9 21.5 5.5 4.0 0.100 5.5 4.0 0.100 450 5.5 4.0 120 1840 5.5 4.0 40 0.100 990 5.5 4.0 150 0.400 9.0 6.5 20 0.050 11.0 16.0 120 9.0 6.5 4 0.020 11.0 16.0 9.0 6.5 0.100 25.5 11.0 16.0 490 9.0 6.5 0.100 25.5 11.0 16.0 9.0 6.5 40 0.100 25.5 11.0 16.0 520 12.0 9.0 40 0.100 29.0 14.0 18.5 410 14.0 10.0 20 0.050 15.9 21.5 14.0 10.0 0.100 15.9 21.5 180 14.0 10.0 120 15.9 560 14.0 10.0 40 0.100 15.9 14.0 10.0 150 0.400 15.9 1400 18.0 14.0 20 0.050 50.0 22.0 28.0 40 18.0 14.0 0.100 50.0 22.0 28.0 120 18.0 14.0 120 44.0 22.0 28.0 520 18.0 14.0 40 0.100 44.0 22.0 28.0 290 18.0 14.0 150 0.400 44.0 22.0 28.0 18.0 14.0 500 2.500 44.0 at 2.5 22.0 28.0 1440 26.0 20.0 0.100 60.0 110 26.0 20.0 100 60.0 29.5 220 26.0 20.0 40 0.100 60.0 29.5 140 26.0 20.0 150 0.600 60.0 29.5 600 26.0 20.0 1.200 60.0 at 2.5 29.5 1040 25.0 0.100 46.0 90 25.0 0.100 46.0 90 25.0 280 1.200 68.0 at 2.5 1820 25.0 220 0.900 68.0 at 2.5 0.800 49.0 500 26.0 180 42.0 180 0.800 92.0 46.0 60.0 425 48.0 40.0 250 1.200 105.0 at 2.5 54.5 66.5 520 48.0 40.0 220 0.900 105.0 at 2.5 54.5 66.5 500 56.0 40.0 180 1.000 120.0 61.0 180 60.0 50.0 250 1.500 440 68.0 50.0 180 1.000 140.0 90.0 100 85.0 250 2.500 180.0 at 2.5 95.0 115.0 260 120.0 125 2.000 260.0 at 2.5 165.0 80
Part Number
5
V5.5MLA0402N V5.5MLA0402LN
5 4
V5.5MLA0805N V5.5MLA0805LN V5.5MLA1206N V9MLA0402N V9MLA0402LN
5 4
V9MLA0805LN V12MLA0805LN V14MLA0402N V14MLA0805N V14MLA0805LN V14MLA1206N V18MLA0402N V18MLA0805N V18MLA0805LN V18MLA1206N V18MLA1210N V26MLA0805N V26MLA0805LN V26MLA1206N V26MLA1210N
V42MLA1206N V48MLA1210N V48MLA1210LN V56MLA1206N V60MLA1210N V68MLA1206N V85MLA1210N V120MLA1210N
1 'L' suffix is a low capacitance and energy version; Contact your Littelfuse sales representative for custom capacitance requirements 2 Typical leakage at 25C<25A, maximum leakage 100A at VM(DC); for 0402 size, typical leakage <5A, maximum leakage <20A at VM(DC)
ML Varistor Series
38 Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > ML Series
Peak Current and Energy Derating Curve 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 temperature, the peak surge current and energy ratings must be derated as shown below.
PERCENT OF RATED VALUE
Peak Pulse Current Test Waveform for Clamping Voltage
PERCENT OF PEAK VALUE
100
50
0 T O1 T1 T2 TIME
100 80 60 40 20 0 -55 50 60 70 80 90 100 110 120 130 140 150
Figure 2
01 T1 = Rise Time = 1.25 x T T2 = Decay Time Example - For an 8/20 8s = T1 = Rise Time 20s = T2 = Decay Time
Figure 1
AMBIENT TEMPERATURE ( oC)
Limit V-I Characteristic for V5.5MLA0402 to V18MLA0402
Limit V-I Characteristic for V9MLA0402L
100
100
Varistor Voltage (V)
Varistor Voltage (V)
10
V18MLA0402 V14MLA0402 V9MLA0402 V5.5MLA0402
10
V9MLA0402L V5.5MLA0402L
1 1A
10A
100A
1mA Current (A)
10mA
1A
10A
100A
1 1A
10A
100A
1mA
10mA
1A
10A
100A
Figure 3
Figure 4
Current (A)
Limit V-I Characteristic for V3.5MLA0603 to V30MLA0603
1000
Limit V-I Characteristic for V3.5MLA0805L to V30MLA0805L
1000
V30MLA0805L V26MLA0805L V18MLA0805L
V30MLA0603 V26MLA0603 V18MLA0603
Varistor Voltage (V)
V14MLA0603
Varistor Voltage (V)
100
100
V14MLA0805L
10
V12MLA0805L V9MLA0805L V5.5MLA0805L V3.5MLA0805L
10
V9MLA0603, V9MLA0603L V5.5MLA0603, V5.5MLA0603L V3.5MLA0603
1 10A
1 10A
100A 1mA 10mA Current (A) 100mA 1A 10A 100A
100A
1mA
10mA Current (A)
100mA
1A
10A
100A
Figure 5
Figure 6
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
39 Revision: July 16, 2009
ML Varistor Series
ML Series
Surface Mount Multilayer Varistors (MLVs) > ML Series
Varistor Products
Limit V-I Characteristic for V3.5MLA0805 to V26MLA0805
Limit V-I Characteristic for V3.5MLA1206 to V68MLA1206
1000
1000
Varistor Voltage (V)
100
100
Varistor Voltage (V)
10
V26MLA0805 V18MLA0805 V14MLA0805 V5.5MLA0805 V3.5MLA0805
10
V68MLA1206 V56MLA1206 V42MLA1206 V33MLA1206 V26MLA1206 V18MLA1206 V14MLA1206 V5.5MLA1206 V3.5MLA1206
1 10A
100A
1mA
10mA
100mA Current (A)
1A
10A
100A
1000A
1 10A
Figure 7
100A
1mA
10mA
Figure 8
100mA Current (A)
1A
10A
100A
1000A
Limit V-I Characteristic for V18MLA1210 to V120MLA1210
1000
MAXIMUM CLAMPING VOLTAGE MAXIMUM LEAKAGE
100
Varistor Voltage (V)
V120MLA1210
10
V85MLA1210 V60MLA1210 V48MLA1210, V48MLA1210L V30MLA1210, V30MLA1210L V26MLA1210
1 10A
V18MLA1210
100A
1mA
10mA
100mA
1A
10A
100A
1000A
Figure 9
CURRENT (A)
ML Varistor Series
40 Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > ML Series
Device Characteristics 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 106 at its maximum rated working voltage). Leakage currents at maximum rated voltage are below 100A, typically 25A; for 0402 size below 20A, typically 5A.
Typical Temperature Dependance of the Haracteristic Curve in the Leakage Region
100% SUPPRESSOR VOLTAGE IN PERCENT OF
Clamping Voltage Over Temperature (VC at 10A)
100
CLAMPING VOLTAGE (V)
V26MLA1206
V5.5MLA1206
10 -60
-40
-20
0
T VNOM VALUE A 25 oC (%)
Figure 11
Energy Absorption/Peak Current Capability Energy dissipated within the ML 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, 8/20s). At the end of the test,10,000 pulses later, the device voltage characteristics are still well within specification.
25 10% 1E -9 1E -8
o
50o 75o 1E -7
100o 125 oC 1E -6 1E -5 1E -4 1E -3 1E -2
Figure 10
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 ZN than 1ns and the ML 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.
Multilayer Internal Construction
FIRED CERAMIC DIELECTRIC
100
PEAK CURRENT = 150A 8/20 s DURATION, 30s BETWEEN PULSES
METAL ELECTRODES METAL END TERMINATION
VOLTAGE
V26MLA1206
DEPLETION REGION
10 0 2000 4000 6000 NUMBER OF PULSES 8000 10000 12000
Figure 13
DEPLETION REGION
Figure 12
GRAINS
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
41 Revision: July 16, 2009
ML Varistor Series
ML Series
20 40 60 80 TEMPERATURE ( oC)
100
120
140
Surface Mount Multilayer Varistors (MLVs) > ML Series
Varistor Products
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. The recommended solder for the ML suppressor is
TEMPERATURE C
Reflow Solder Profile
250
MAXIMUM TEMPERATURE 230C
Littelfuse also recommends an RMA solder flux. 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 ML 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. still necessary to ensure that any further thermal shocks
200
150
40-80 SECONDS ABOVE 183C RAMP RATE <2C/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 MAXIMUM WAVE 260C 250 TEMPERATURE C
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 50 C before cleaning.
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 optimum Lead-free solder performance, consisting of a Matte Tin outer surface plated on Nickel underlayer, plated on Silver base metal.
TEMPERATURE C
Lead-free Re-flow Solder Profile
300 250
MAXIMUM TEMPERATURE 260C, TIME WITHIN 5C OF PEAK 20 SECONDS MAXIMUM RAMP RATE <3C/s 60 - 150 SEC > 217C
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
200 150 100 50 0 0 1.0 2.0
PREHEAT ZONE
3.0
4.0
5.0
6.0
7.0
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.
42
Figure 16
TIME (MINUTES)
ML Varistor Series
Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > ML Series
Product Dimensions (mm)
C
E
B
NOTE
D L W
A
Silver (Ag) epoxy paste.
Dimension A B C D (max.) E L W
IN 0.160 0.100 0.040 0.020 0.125 0.100
MM 4.06 2.54 1.02 0.50
IN 0.160 0.065 0.040 0.020 0.125
MM 4.06 1.65 1.02 1.80 0.50
IN 0.120 0.050 0.040
MM
IN 0.100
MM 2.54
IN 0.020
MM 0.51 0.61 0.60 0.25 1.00
1.02 1.10 0.040 0.015
0.89 1.00 0.4 1.6 0.8
0.024 0.024 0.010
0.010
0.25 2.01
2.54
0.060
1.60
0.049
1.25
0.020
0.50
Part Numbering System
V 18 MLA 1206 X X X
DEVICE FAMILY Littelfuse TVSS Device MAXIMUM DC WORKING VOLTAGE MULTILAYER SERIES DESIGNATOR DEVICE SIZE: i.e., 120 mil x 60 mil
(3mm x 1.5mm)
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 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
1 V120MLA1210 standard shipping quantities are 1000 pieces per reel for the "H" option and 4000 pieces per reel for "T" option.
Packaging*
Quantity Device Size 1210 1206 0805 0402 13" Inch Reel ("T" Option) 8,000 10,000 10,000 10,000 N/A 7" Inch Reel ("H" Option) 2,000 2,500 2,500 2,500 N/A 7" Inch Reel ("R" Option) N/A N/A N/A 4,000 10,000 Bulk Pack ("A" Option) 2,000 2,500 2,500 2,500 N/A
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.
43 Revision: July 16, 2009
ML Varistor Series
ML Series
1210 Size
1206 Size
0805 Size
0603 Size
0402 Size
Surface Mount Multilayer Varistors (MLVs) > ML Series
Varistor Products
Tape and Reel Specifications
D0 P0 P2 E For T and H Pack Options: PLASTIC CARRIER TAPE For R Pack Options: EMBOSSED PAPER CARRIER TAPE PRODUCT IDENTIFYING LABEL
F K0 B0
W
t1
D1
P1
A0
EMBOSSMENT TOP TAPE
8mm NOMINAL
178mm OR 330mm DIA. REEL
Symbol A0 B0 K0 W F E P1 P2 P0 D0 D1 T1 Top Tape Thickness Width of Cavity Length of Cavity Depth of Cavity Width of Tape
Description
Dimensions in Millimeters 0402 Size 0603, 0805, 1206 & 1210 Sizes Dependent on Chip Size to Minimize Rotation. Dependent on Chip Size to Minimize Rotation. Dependent on Chip Size to Minimize Rotation.
Distance Between Drive Hole Centers and Cavity Centers Distance Between Drive Hole Centers and Tape Edge Distance Between Cavity Centers Axial Drive Distance Between Drive Hole Centers & Cavity Centers Axial Drive Distance Between Drive Hole Centers Drive Hole Diameter N/A 0.1 Max 0.1 Max
ML Varistor Series
44 Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/ML.html for current information.

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