Mlv Design Guide Page 17 MLV Selection Steps

EXAMPLE 3 (ESD PROTECTION) Circuit conditions and requirements: Circuit operating voltage at 3.0VDC Current waveform IEC61000-4-2 ESD waveform 30 times at 8kV Contact Discharge Signal speed at 500MHz Other components (Most vulnerable device to be protected, such as an IC rated at 500V) Approach to Finding Solution Compare Requirement to V0402MMHS03N Step 1: To find the voltage rating of the MLV, allow for 20% head room take into account voltage variations (3.0VDC x 1.2 + 3.6VDC; So look at 5.5VDC rated MLVs) (Refer to the summary in Table 17) Voltage rating of 5.5VDC Step 2: Determine which MLV size to use (Identify contact discharge ESD at 8kV and related clamping voltage level at 300V (Refer to the summary in Table 18) Device size of 0402 (1.0 x 0.5mm) Step 3: Check signal integrity with Insertion Loss Chart (Refer to the summary in Figure 17) Can meet -3dB at 1000GHz Step 4: Use nominal stability to multiple ESD impulse chart for repetitive ESD withstanding capability (Refer to the summary in Figure 18) Able to meet at least 1000 8kV contact discharge human body model ESD pulses Part Number Performance Specifications (25 C) Maximum Clamping Voltage At 1A (8X20 s) Maximum ESD Clamp Voltage (Note 1) Typical Leakage Current at Specified DC Voltage Typical Capacitance at 1MHz (1V p-p) Typical Inductance (from Impedance Analysis) 8kV Contact (Note 2) 15kV AIR (Note 3) 3.5V 5.5V C (Note 4) L Clamp P I L MIN MAX (V c ) (V) ( A) ( A) (pF) (pF) (nH) V0402MHS03N 135 <300 <400 0.5 1.00 2 5 <1.0 V0603MHS03N 135 <300 <400 0.5 1.00 1 6 <1.0 V0402MHS12N 55 <125 <160 0.5 1.00 8 16 <1.0 V0603MHS12N 55 <125 <160 0.5 1.00 8 16 <1.0 V0402MHS22N 30 <125 <160 0.5 1.00 15 29 <1.0 V0603MHS22N 30 <65 <100 0.5 1.00 15 29 <1.0 Part Number Performance Specifications (25 C) Maximum Clamping Voltage At 1A (8X20 s) Maximum ESD Clamp Voltage (Note 1) Typical Leakage Current at Specified DC Voltage Typical Capacitance at 1MHz (1V p-p) Typical Inductance (from Impedance Analysis) 8kV Contact (Note 2) 15kV AIR (Note 3) 3.5V 5.5V C (Note 4) L Clamp P I L MIN MAX (V c ) (V) ( A) ( A) (pF) (pF) (nH) V0402MHS03N 135 <300 <400 0.5 1.00 2 5 <1.0 V0603MHS03N 135 <300 <400 0.5 1.00 1 6 <1.0 V0402MHS12N 55 <125 <160 0.5 1.00 8 16 <1.0 V0603MHS12N 55 <125 <160 0.5 1.00 8 16 <1.0 V0402MHS22N 30 <125 <160 0.5 1.00 15 29 <1.0 V0603MHS22N 30 <65 <100 0.5 1.00 15 29 <1.0 Step 1 - Determine the voltage rating of the MLV device Step 2 - Determine the size of the MLV device Table 17. Step 1 Illustration Table 18. Step 2 Illustration 2016 Littelfuse Multilayer Varistors (MLVs) Design Guide www.littelfuse.com Surface Mount Multilayer Varistors (MLVs) Design Guide MLV Selection - Examples (continued) 17

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