? semiconductor components industries, llc, 2002 february, 2002 rev. 3 1 publication order number: 1n5908/d 1n5908 1500 watt mosorb ? zener transient voltage suppressors unidirectional* mosorb devices are designed to protect voltage sensitive components from high voltage, highenergy transients. they have excellent clamping capability, high surge capability, low zener impedance and fast response time. these devices are on semiconductor's exclusive, cost-effective, highly reliable surmetic ? axial leaded package and are ideally-suited for use in communication systems, numerical controls, process controls, medical equipment, business machines, power supplies and many other industrial/consumer applications, to protect cmos, mos and bipolar integrated circuits. specification features: ? working peak reverse voltage range 5 v ? peak power 1500 watts @ 1 ms ? maximum clamp voltage @ peak pulse current ? low leakage < 5 m a above 10 v ? response time is typically < 1 ns mechanical characteristics: case: void-free, transfer-molded, thermosetting plastic finish: all external surfaces are corrosion resistant and leads are readily solderable maximum lead temperature for soldering purposes: 230 c, 1/16 from the case for 10 seconds polarity: cathode indicated by polarity band mounting position: any maximum ratings rating symbol value unit peak power dissipation (note 1.) @ t l 25 c p pk 1500 watts steady state power dissipation @ t l 75 c, lead length = 3/8 derated above t l = 75 c p d 5.0 50 watts mw/ c thermal resistance, junctiontolead r jl 20 c/w forward surge current (note 2.) @ t a = 25 c i fsm 200 amps operating and storage temperature range t j , t stg 65 to +175 c 1. nonrepetitive current pulse per figure 4 and derated above t a = 25 c per figure 2. 2. 1/2 sine wave (or equivalent square wave), pw = 8.3 ms, duty cycle = 4 pulses per minute maximum. * bidirectional device will not be available in this device axial lead case 41a plastic http://onsemi.com l = assembly location 1n5908 = jedec device code yy = year ww = work week cathode anode device package shipping ordering information 1n5908 axial lead 500 units/box 1n5908rl4 axial lead 1500/tape & reel l 1n 5908 yyww
unidirectional tvs i pp i f v i i r i t v rwm v c v br v f 1n5908 http://onsemi.com 2 electrical characteristics (t a = 25 c unless otherwise noted, v f = 3.5 v max. @ i f (note 3.) = 100 a) symbol parameter i pp maximum reverse peak pulse current v c clamping voltage @ i pp v rwm working peak reverse voltage i r maximum reverse leakage current @ v rwm v br breakdown voltage @ i t i t test current i f forward current v f forward voltage @ i f electrical characteristics (t a = 25 c unless otherwise noted, v f = 3.5 v max. @ i f (note 3. ) = 53 a) v rwm breakdown voltage v c (volts) (note 7.) device v rwm (note 5.) i r @ v rwm v br (note 6.) (volts) @ i t d ev i ce (note 4.) (volts) ( m a) min nom max (ma) @ i pp = 120 a @ i pp = 60 a @ i pp = 30 a 1n5908 5.0 300 6.0 1.0 8.5 8.0 7.6 notes: 3. square waveform, pw = 8.3 ms, nonrepetitive duty cycle. 4. 1n5908 is jedec registered as a unidirectional device only (no bidirectional option) 5. a transient suppressor is normally selected according to the maximum working peak reverse voltage (v rwm ), which should be equal to or greater than the dc or continuous peak operating voltage level. 6. v br measured at pulse test current i t at an ambient temperature of 25 c and minimum voltages in v br are to be controlled. 7. surge current waveform per figure 4 and derate per figure 2 of the general data 1500 w at the beginning of this group
1n5908 http://onsemi.com 3 figure 1. pulse rating curve 100 80 60 40 20 0 0 25 50 75 100 125 150 175 200 peak pulse derating in % of peak power or current @ t a = 25 c t a , ambient temperature ( c) figure 2. pulse derating curve 5 4 3 2 1 25 50 75 100 125 150 175 200 p d , steady state power dissipation (watts) t l , lead temperature ( c) 3/8 3/8 figure 3. steady state power derating 0 0 100 50 0 01 2 3 4 t, time (ms) value (%) t r 10 m s t p peak value - i pp half value - i pp 2 figure 4. pulse waveform pulse width (t p ) is defined as that point where the peak current decays to 50% of i pp . 1 m s 10 m s 100 m s 1 ms 10 ms 100 10 1 t p , pulse width p pk , peak power (kw) nonrepetitive pulse waveform shown in figure 5 0.1 m s figure 5. typical derating factor for duty cycle derating factor 1 ms 10 m s 1 0.7 0.5 0.3 0.05 0.1 0.2 0.01 0.02 0.03 0.07 100 m s 0.1 0.2 0.5 2 5 10 50 1 20 100 d, duty cycle (%) pulse width 10 ms
1n5908 http://onsemi.com 4 application notes response time in most applications, the transient suppressor device is placed in parallel with the equipment or component to be protected. in this situation, there is a time delay associated with the capacitance of the device and an overshoot condition associated with the inductance of the device and the inductance of the connection method. the capacitance effect is of minor importance in the parallel protection scheme because it only produces a time delay in the transition from the operating voltage to the clamp voltage as shown in figure 6. the inductive effects in the device are due to actual turn-on time (time required for the device to go from zero current to full current) and lead inductance. this inductive effect produces an overshoot in the voltage across the equipment or component being protected as shown in figure 7. minimizing this overshoot is very important in the application, since the main purpose for adding a transient suppressor is to clamp voltage spikes. these devices have excellent response time, typically in the picosecond range and negligible inductance. however, external inductive effects could produce unacceptable overshoot. proper circuit layout, minimum lead lengths and placing the suppressor device as close as possible to the equipment or components to be protected will minimize this overshoot. some input impedance represented by z in is essential to prevent overstress of the protection device. this impedance should be as high as possible, without restricting the circuit operation. duty cycle derating the data of figure 1 applies for non-repetitive conditions and at a lead temperature of 25 c. if the duty cycle increases, the peak power must be reduced as indicated by the curves of figure 5. average power must be derated as the lead or ambient temperature rises above 25 c. the average power derating curve normally given on data sheets may be normalized and used for this purpose. at first glance the derating curves of figure 5 appear to be in error as the 10 ms pulse has a higher derating factor than the 10 m s pulse. however, when the derating factor for a given pulse of figure 5 is multiplied by the peak power value of figure 1 for the same pulse, the results follow the expected trend. typical protection circuit v in v l v v in v in (transient) v l t d v v l v in (transient) z in load overshoot due to inductive effects t d = time delay due to capacitive effect t t figure 6. figure 7.
1n5908 http://onsemi.com 5 clipper bidirectional devices 1. clipper-bidirectional devices are available in the 1.5kexxa series and are designated with a acao suffix; for example, 1.5ke18ca. contact your nearest on semiconductor representative. 2. clipper-bidirectional part numbers are tested in both directions to electrical parameters in preceeding table (except for v f which does not apply). 3. the 1n6267a through 1n6303a series are jedec registered devices and the registration does not include a acao suffix. to order clipper-bidirectional devices one must add ca to the 1.5ke device title.
1n5908 http://onsemi.com 6 outline dimensions 1500 watt mosorb transient voltage suppressors axial leaded mosorb case 41a04 issue d dim a min max min max millimeters 0.335 0.374 8.50 9.50 inches b 0.189 0.209 4.80 5.30 d 0.038 0.042 0.96 1.06 k 1.000 --- 25.40 --- p --- 0.050 --- 1.27 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. lead finish and diameter uncontrolled in dimension p. 4. 041a-01 thru 041a-03 obsolete, new standard 041a-04. d k p p a k b
1n5908 http://onsemi.com 7 notes
1n5908 http://onsemi.com 8 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. 1n5908/d mosorb and surmetic are trademarks of semiconductor components industries, llc. literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada
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