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Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MHS Series
RoHS
MHS Varistor Series
Description The Multilayer High-Speed MHS Series is a very-low capacitance extension to the Littelfuse ML family of transient voltage surge suppression devices available in an 0402 and 0603-size surface mount chip. The MHS Series provides protection from ESD and EFT in high-speed data line and other high frequency applications. The low capacitance of the MHS Series permits usage in analog or digital circuits where it will not attenuate or distort the desired signal or data. Their small size is ideal for high-density printed circuit boards, being typically applied to protect intergrated circuits and other sensitive components. They are particularly well suited to suppress ESD events including those specified in IEC 61000-4-2 or other standards used for Electromagnetic Compliance (EMC) testing. The MHS Series is manufactured from semiconducting ceramics and is supplied in a leadless, surface mount package. The MHS Series is also compatible with modern reflow and wave soldering prcesses. Littelfuse Inc. manufactures other multilayer varistor series products, see the ML, MLE, MLN and AUML Series data sheets.
Size Table
Metric EIA 0402 1608 0603
Applications Communications
Features 61000-4-4 (Level 4) capacitance versions suitable for high-speed data rate lines 61000-4-2 (Level 4)
operating temp. range
Including Medical
Absolute Maximum Ratings
Continuous Steady State Applied Voltage:
M(DC)
MHS Series ): 42 18 09
A STG
Units
)
C C
)
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/MHS.html for current information.
25 Revision: July 16, 2009
MHS Varistor Series
MHS Series
Surface Mount Multilayer Varistors (MLVs) > MHS Series
Varistor Products
Device Ratings and Specifications
Performance Specifications (25 C) Maximum Clamping Voltage At 1A (8X20s) (Vc) Maximum ESD Clamp Voltage (Note 1) 8kV Contact (Note 2) Clamp (V) <300 <300 15kV AIR (Note 3) Clamp (V) <400 <400 <160 <160 30 30 <160 <100 Typical Leakage Current at Specified DC Voltage 3.5V P (A) 5.5V IL (A) 1.00 1.00 1.00 1.00 1.00 1.00 Typical Capacitance at 1MHz (1V p-p) C (Note 4) MIN MAX (pF) 1 1 8 8 6 6 16 16 29 29 (pF) Typical Inductance (from Impedance Analysis) L (nH) <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
Part Number
2. Direct discharge to device terminals (IEC preferred test method). 3. Corona discharge through air (represents actual ESD event).
Peak Current and Energy Derating Curve peak surge current and energy ratings must be reduced as shown below.
Standby Current at Normalized Varistor Voltage and Temperature
1.2 NORMALIZED VARISTOR VOLTAGE (V) 1.0 0.8 0.6 0.4 0.2 0.0 0.0001 0.001 0.01 CURRENT (mA) 0.1 1 125O 25O 85O
100 PERCENT OF RATED VALUE 80 60 40 20 0 -55
Figure 2
50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( oC)
Figure 1
Insertion Loss (S21) Characteristics Nominal Voltage Stability to Multiple ESD Impulses (8kV Contact Discharges per IEC 61000-4-2)
INSERTION LOSS (dB)
60 NOMINAL VOLTAGE AT 1mADC V0402MHS03 V0603MHS03
0
-10
V0402MHS12 V0603MHS12 V0402MHS03 V0603MHS03
50
40
-20
30
V0402MHS12 V0603MHS12
V0402MHS22 V0603MHS22
20 V0402MHS22 V0603MHS22 10
-30 10 100 1000 FREQUENCY (MHz) 10000
Figure 4
1 10 100 1000 10000 Number of Pulses
0
Figure 3
MHS Varistor Series
26 Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/MHS.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MHS Series
Device Characteristics
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 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
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 model (approaching 106 at its maximum rated working voltage). Leakage currents at maximum rated voltage are below 100 A; for 0402 size below 20 A.
Typical Temperature Dependance of the Characteristic
100% SUPPRESSOR VOLTAGE IN PERCENT OF
T VNOM VALUE A 25 oC (%)
METAL ELECTRODES METAL END TERMINATION
DEPLETION
25 10% 1E -9 1E -8
o
REGION
50o 75o 1E -7
100o 125 oC 1E -6 1E -5 1E -4 1E -3 1E -2
DEPLETION REGION GRAINS
Figure 5
SUPPRESSOR CURRENT (ADC)
Figure 6
Lead (Pb) Soldering Recommendations The principal techniques used for the soldering of and Wave soldering. Typical profiles are shown on the right. The recommended solder for the MHS suppressor is
230
Reflow Solder Profile
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 MHS 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 peak temperature is essential to minimize thermal shock. still necessary to ensure that any further thermal shocks 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
Figure 7
Wave Solder Profile
Figure 8
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/MHS.html for current information. 27 Revision: July 16, 2009 MHS Varistor Series
MHS Series
FIRED CERAMIC DIELECTRIC
Surface Mount Multilayer Varistors (MLVs) > MHS Series
Varistor Products
Lead-free (Pb-free) Soldering Recommendations optimum Lead-free solder performance. flux, but there is a wide selection of pastes and fluxes compatible. The reflow profile must be constrained by the maximums
PREHEAT ZONE
Lead-free Re-flow Profile
MAXIMUM TEMPERATURE 260C 20 - 40 SECONDS WITHIN 5C RAMP RATE <3C/s
60 - 150 SEC > 217C
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. Product Dimensions (mm)
5.0
6.0
7.0
Figure 10
E
D L W
Note: Avoid metal runs in this area, parts are not recommended for use in applications using Silver (Ag) epoxy paste.
Dimension A B C D (max.) E L W
0402 Size IN 0.020 0.024 0.024 0.610 0.600 0.040 MM IN 0.100
0603 Size MM
0.030 0.890 1.000
MHS Varistor Series
28 Revision: July 16, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/MHS.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MHS Series
Part Numbering System
V 0402 MHS 03 N H
DEVICE FAMILY Littelfuse TVSS Device DEVICE SIZE
i.e. 40Mil x 20Mil (1.0mm x 0.5mm)
PACKING OPTIONS (See quantities in Packaging section) T: 13in (330mm) Diameter Reel, Plastic Carrier Tape (0603) H: 7in (178mm) Diameter Reel, Plastic Carrier Tape R: 7in (178mm) Diameter Reel, Paper Carrier Tape END TERMINATION OPTION N: Nickel Barrier (Ni/Sn) CAPACITANCE DESIGNATION 03 = 3pF 12 = 12pF 22 = 22pF
SERIES DESIGNATOR
Multilayer Hi-Speed
Packaging*
Device Size 0603 0402
13 Inch Reel ("T" Option) 10,000
7 Inch Reel ("H" Option)
7 Inch Reel ("R" Option) 4,000 10,000
Tape and Reel Specifications
T D0 P0 P2 E F K0 B0
W
T1
D1
P1
A0
Symbol A0 B0 K0 W F E P1 P2 P0 D0 D1 T1 T
Notes:
Description Width of Cavity Length of Cavity Depth of Cavity Width of Tape
Dimensions in Millimeters 0402 Size 0603 Size
Drive Hole Diameter Top Tape Thickness Nominal Carrier Tape Thickness 0.1 Max 1.1 0.1 Max 1.1
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/MHS.html for current information.
29 Revision: July 16, 2009
MHS Varistor Series
MHS Series
Quantity

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