1N5908 Preferred Device 1500 Watt Mosorbt Zener Transient Voltage Suppressors Unidirectional* Mosorb devices are designed to protect voltage sensitive components from high voltage, high-energy transients. They have excellent clamping capability, high surge capability, low zener impedance and fast response time. These devices are ONSemiconductor'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. http://onsemi.com Cathode Anode Features •Working Peak Reverse Voltage Range - 5.0 V •Peak Power - 1500 Watts @ 1 ms •Maximum Clamp Voltage @ Peak Pulse Current •Low Leakage < 5 mA Above 10 V •Response Time is Typically < 1 ns •These are Pb-Free Devices* AXIAL LEAD CASE 41A PLASTIC MARKING DIAGRAM Mechanical Characteristics CASE: Void‐free, transfer‐molded, thermosetting plastic FINISH: All external surfaces are corrosion resistant and leads are A 1N 5908 YYWW readily solderable MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES: 260°C, 1/16″ from the case for 10 seconds POLARITY: Cathode indicated by polarity band MOUNTING POSITION: Any A = Assembly Location 1N5908 = JEDEC Device Number YY = Year WW = Work Week = Pb-Free Package (Note: Microdot may be in either location) ORDERING INFORMATION Package Shipping† 1N5908G Axial Lead (Pb-Free) 500 Units/Box 1N5908RL4G Axial Lead (Pb-Free) 1500/Tape & Reel Device †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2007 July, 2007 - Rev. 5 1 Preferred devices are recommended choices for future use and best overall value. Publication Order Number: 1N5908/D 1N5908 MAXIMUM RATINGS Symbol Value Unit Peak Power Dissipation (Note 1) @ TL ≤ 25°C Rating PPK 1500 W Steady State Power Dissipation @ TL ≤ 75°C, Lead Length = 3/8″ Derated above TL = 75°C PD 5.0 W 50 mW/°C Thermal Resistance, Junction-to-Lead RqJL 20 °C/W Forward Surge Current (Note 2) @ TA = 25°C IFSM 200 A TJ, Tstg -65 to +175 °C Operating and Storage Temperature Range Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Nonrepetitive current pulse per Figure 4 and derated above TA = 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 I ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 3) = 100 A) Symbol IPP Maximum Reverse Peak Pulse Current VC Clamping Voltage @ IPP VRWM IR VBR IF Parameter VC VBR VRWM Working Peak Reverse Voltage IR VF IT Maximum Reverse Leakage Current @ VRWM V Breakdown Voltage @ IT IT Test Current IF Forward Current VF Forward Voltage @ IF IPP Uni-Directional TVS ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 3) = 53 A) Device (Note 4) Breakdown Voltage VRWM (Note 5) IR @ VRWM (Volts) (mA) VBR Min (Note 6) (Volts) Nom Max VC (Volts) (Note 7) @ IT (mA) @ IPP = 120 A @ IPP = 60 A @ IPP = 30 A 1N5908 5.0 300 6.0 1.0 8.5 8.0 7.6 3. Square waveform, PW = 8.3 ms, Non-repetitive 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 (VRWM), which should be equal to or greater than the dc or continuous peak operating voltage level. 6. VBR measured at pulse test current IT at an ambient temperature of 25°C and minimum voltages in VBR 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 http://onsemi.com 2 1N5908 PPK , PEAK POWER (kW) NONREPETITIVE PULSE WAVEFORM SHOWN IN FIGURE 5 10 PEAK PULSE DERATING IN % OF PEAK POWER OR CURRENT @ TA= 25° C 100 1 0.1ms 1ms 10ms 100ms 1 ms 100 80 60 40 20 0 0 10 ms 25 50 tP, PULSE WIDTH Figure 2. Pulse Derating Curve PEAK VALUE - IPP 100 3/8″ VALUE (%) 5 PULSE WIDTH (tP) IS DEFINED AS THAT POINT WHERE THE PEAK CURRENT DECAYS TO 50% OF IPP. tr ≤ 10ms 3/8″ 4 3 HALF VALUE - IPP 2 50 2 tP 1 0 0 0 25 50 75 100 125 150 175 TL, LEAD TEMPERATURE (°C) 200 0 1 2 Figure 4. Pulse Waveform 1 0.7 0.5 0.3 0.2 PULSE WIDTH 10 ms 0.1 0.07 0.05 1 ms 0.03 100 ms 0.02 10 ms 0.01 0.1 0.2 0.5 3 t, TIME (ms) Figure 3. Steady State Power Derating DERATING FACTOR PD , STEADY STATE POWER DISSIPATION (WATTS) Figure 1. Pulse Rating Curve 75 100 125 150 175 200 TA, AMBIENT TEMPERATURE (°C) 1 2 5 10 D, DUTY CYCLE (%) 20 50 100 Figure 5. Typical Derating Factor for Duty Cycle http://onsemi.com 3 4 1N5908 APPLICATION NOTES RESPONSE TIME 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 Zin is essential to prevent overstress of the protection device. This impedance should be as high as possible, without restricting the circuit operation. 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 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 ms 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 Zin LOAD Vin V VL Vin (TRANSIENT) V OVERSHOOT DUE TO INDUCTIVE EFFECTS VL Vin (TRANSIENT) VL Vin td tD = TIME DELAY DUE TO CAPACITIVE EFFECT t t Figure 6. Figure 7. CLIPPER BIDIRECTIONAL DEVICES 1. Clipper‐bidirectional devices are available in the 3. The 1N6267A through 1N6303A series are JEDEC 1.5KEXXA series and are designated with a “CA” suffix; registered devices and the registration does not include a for example, 1.5KE18CA. Contact your nearest ON “CA” suffix. To order clipper‐bidirectional devices one Semiconductor representative. must add CA to the 1.5KE device title. 2. Clipper‐bidirectional part numbers are tested in both directions to electrical parameters in preceeding table (except for VF which does not apply). http://onsemi.com 4 1N5908 PACKAGE DIMENSIONS MOSORB CASE 41A-04 ISSUE D B 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 DIM A B D K P A INCHES MIN MAX 0.335 0.374 0.189 0.209 0.038 0.042 1.000 ----0.050 MILLIMETERS MIN MAX 8.50 9.50 4.80 5.30 0.96 1.06 25.40 ----1.27 K Mosorb and Surmetic is a trademark of Semiconductor Components Industries, LLC. ON Semiconductor and are registered 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. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” 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 situation 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 unauthorized 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. 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