Transient Protection - MLVs AVX Ron Demcko 3900 Electronics Drive Raleigh, N.C. 27604 rdemcko@avxus.com 919-878-6224 phone 919-878-6218 fax

Protection Schemes MultiLayer Varistors (MLVs) TVS Diodes

Typical Protection Schemes Circuit Implementation MultiLayer Varistors (MLVs) TVS Diodes TVS & EMI TVS Need EMC Cap SEE AVX SAE Tech paper for more details

5 component solution

AVX = SINGLE PART SOLUTION

MLV vs Diode Comparison Note: Several MLV CAN Parts exist: <40, 60, 120, 220 & 470 pf

Dashed line indicated S21 available with MLVs 39 v Zener SOD 123 Dashed line indicated S21 available with MLVs

Diode Repetitive Surge Test Results

MLVs – Multi Layer Varistors Available in discrete & Array Forms EMI Filter in Off State Back to Back Zener in on state High In Rush Current Capability Sub ns Turn On Time High ESD repetitive Strike Capability No Temperature De-rating to 125 c Small Size

MLVs – Multi Layer Varistors FeedThru MLVs Available in discrete & Array Forms EMI Filter in Off State – HIGH Q Filter Back to Back Zener in on state High In Rush Current Capability Sub ns Turn On Time High ESD repetitive Strike Capability No Temperature De-rating to 125 c Small Size

MLV Capacitance Temperature Stability

MLV Terminology Working Voltage = voltage at which the part can operate indefinitely current is </= 50 ua Breakdown Voltage = voltage at which the part draws 1 ma of current Clamping Voltage = voltage the part limits to when subjected to an 8x20us waveform (current varies with energy rating) Peak Current = maximum 8x20us repetitive strike (500 pulses) current rating Transient Energy = maximum 10x1000us energy in Joules

MLV Repetitive Strike 8/20 us Surge Response

MLV Repetitive Strike 10/700 us Surge Response

Temperature Advantages of MLV MultiLayer Varistor Diode MLVs maintain Energy rating without de rating up to 125 C

Size Advantages of MLVs 0.067” 0.112” 0.020” 0.142” Total Area = Total Area = 0.00134 in2 0.01590 in2 0402 TransGuard SOT 23 Diode & EMC Cap MLVs are 91.5 % SMALLER

Summary AVX MLVs can replace MMBZ diodes for ESD suppression AVX MLV can be placed on the EMC capacitor pad – no board spin MLV exhibit physical & electrical advantages to control EMC large surge capability repetitive strike – no wear out EMI filtering in the off state Low & Hi Q Response Temperature stability Small size/ low weight