1N5817, 1N5818, 1N5819 1N5817 and 1N5819 are Preferred Devices Axial Lead Rectifiers . . . employing the Schottky Barrier principle in a large area metal-to-silicon power diode. State-of-the-art geometry features chrome barrier metal, epitaxial construction with oxide passivation and metal overlap contact. Ideally suited for use as rectifiers in low-voltage, high-frequency inverters, free wheeling diodes, and polarity protection diodes. http://onsemi.com * Extremely Low VF * Low Stored Charge, Majority Carrier Conduction * Low Power Loss/High Efficiency SCHOTTKY BARRIER RECTIFIERS 1.0 AMPERE 20, 30 and 40 VOLTS Mechanical Characteristics * Case: Epoxy, Molded * Weight: 0.4 gram (approximately) * Finish: All External Surfaces Corrosion Resistant and Terminal Leads are Readily Solderable * Lead and Mounting Surface Temperature for Soldering Purposes: * * * * 220C Max. for 10 Seconds, 1/16 from case Shipped in plastic bags, 1000 per bag. Available Tape and Reeled, 5000 per reel, by adding a "RL" suffix to the part number Polarity: Cathode Indicated by Polarity Band Marking: 1N5817, 1N5818, 1N5819 AXIAL LEAD CASE 59-10 DO-41 PLASTIC MAXIMUM RATINGS Please See the Table on the Following Page MARKING DIAGRAM 1N 581x 1N581x = Device Code x = 7, 8 or 9 ORDERING INFORMATION Device Package Shipping 1N5817 Axial Lead 1000 Units/Bag 1N5817RL Axial Lead 5000/Tape & Reel 1N5818 Axial Lead 1000 Units/Bag 1N5818RL Axial Lead 5000/Tape & Reel 1N5819 Axial Lead 1000 Units/Bag 1N5819RL Axial Lead 5000/Tape & Reel Preferred devices are recommended choices for future use and best overall value. Semiconductor Components Industries, LLC, 2003 April, 2003 - Rev. 6 1 Publication Order Number: 1N5817/D 1N5817, 1N5818, 1N5819 MAXIMUM RATINGS Symbol 1N5817 1N5818 1N5819 Unit Peak Repetitive Reverse Voltage Working Peak Reverse Voltage DC Blocking Voltage Rating VRRM VRWM VR 20 30 40 V Non-Repetitive Peak Reverse Voltage VRSM 24 36 48 V VR(RMS) 14 21 28 V RMS Reverse Voltage Average Rectified Forward Current (Note 1) (VR(equiv) 0.2 VR(dc), TL = 90C, RJA = 80C/W, P.C. Board Mounting, see Note 2, TA = 55C) IO Ambient Temperature (Rated VR(dc), PF(AV) = 0, RJA = 80C/W) TA Non-Repetitive Peak Surge Current (Surge applied at rated load conditions, half-wave, single phase 60 Hz, TL = 70C) Operating and Storage Junction Temperature Range (Reverse Voltage applied) 1.0 85 A 80 75 C IFSM 25 (for one cycle) A TJ, Tstg -65 to +125 C TJ(pk) 150 C Symbol Max Unit RJA 80 C/W Peak Operating Junction Temperature (Forward Current applied) THERMAL CHARACTERISTICS (Note 1) Characteristic Thermal Resistance, Junction to Ambient ELECTRICAL CHARACTERISTICS (TL = 25C unless otherwise noted) (Note 1) Characteristic Symbol 1N5817 1N5818 1N5819 Unit (iF = 0.1 A) (iF = 1.0 A) (iF = 3.0 A) vF 0.32 0.45 0.75 0.33 0.55 0.875 0.34 0.6 0.9 V Maximum Instantaneous Reverse Current @ Rated dc Voltage (Note 2) (TL = 25C) (TL = 100C) IR 1.0 10 1.0 10 1.0 10 Maximum Instantaneous Forward Voltage (Note 2) 1. Lead Temperature reference is cathode lead 1/32 from case. 2. Pulse Test: Pulse Width = 300 s, Duty Cycle = 2.0%. http://onsemi.com 2 mA 1N5817, 1N5818, 1N5819 125 NOTE 1. -- DETERMINING MAXIMUM RATINGS TR, REFERENCE TEMPERATURE ( C) Reverse power dissipation and the possibility of thermal runaway must be considered when operating this rectifier at reverse voltages above 0.1 VRWM. Proper derating may be accomplished by use of equation (1). RJA (C/W) = 110 95 80 60 85 75 3.0 2.0 (2) TR, REFERENCE TEMPERATURE ( C) (3) 40 105 TR, REFERENCE TEMPERATURE ( C) Step 4. Find TA(max) from equation (3). Step 4. Find TA(max) = 109 - (80) (0.5) = 69C. 80 3.0 Square Wave 4.0 5.0 7.0 10 15 20 VR, DC REVERSE VOLTAGE (VOLTS) 125 40 115 30 23 105 30 RJA (C/W) = 110 80 95 60 85 75 4.0 5.0 7.0 10 15 20 VR, DC REVERSE VOLTAGE (VOLTS) 30 Figure 3. Maximum Reference Temperature 1N5819 Table 1. Values for Factor F *Note that VR(PK) 2.0 Vin(PK). 60 85 **Values given are for the 1N5818. Power is slightly lower for the 1N5817 because of its lower forward voltage, and higher for the 1N5819. Sine Wave Full Wave, Bridge Full Wave, Center Tapped* Resistive Capacitive* Resistive Capacitive Resistive Capacitive 0.5 1.3 0.5 0.65 1.0 1.3 1.5 0.75 0.75 1.5 1.5 0.75 23 Figure 2. Maximum Reference Temperature 1N5818 Step 1. Find VR(equiv). Read F = 0.65 from Table 1, Step 1. Find VR(equiv) = (1.41)(10)(0.65) = 9.2 V. Step 2. Find TR from Figure 2. Read TR = 109C Step 1. Find @ VR = 9.2 V and RJA = 80C/W. Step 3. Find PF(AV) from Figure 4. **Read PF(AV) = 0.5 W I(FM) @ = 10 and IF(AV) = 0.5 A. I(AV) Load 20 RJA (C/W) = 110 95 75 The factor F is derived by considering the properties of the various rectifier circuits and the reverse characteristics of Schottky diodes. EXAMPLE: Find TA(max) for 1N5818 operated in a 12-volt dc supply using a bridge circuit with capacitive filter such that IDC = 0.4 A (IF(AV) = 0.5 A), I(FM)/I(AV) = 10, Input Voltage = 10 V(rms), RJA = 80C/W. 30 115 (4) Half Wave 15 125 Inspection of equations (2) and (3) reveals that TR is the ambient temperature at which thermal runaway occurs or where TJ = 125C, when forward power is zero. The transition from one boundary condition to the other is evident on the curves of Figures 1, 2, and 3 as a difference in the rate of change of the slope in the vicinity of 115C. The data of Figures 1, 2, and 3 is based upon dc conditions. For use in common rectifier circuits, Table 1 indicates suggested factors for an equivalent dc voltage to use for conservative design, that is: Circuit 4.0 5.0 7.0 10 VR, DC REVERSE VOLTAGE (VOLTS) Figure 1. Maximum Reference Temperature 1N5817 Substituting equation (2) into equation (1) yields: VR(equiv) = Vin(PK) x F 23 105 Figures 1, 2, and 3 permit easier use of equation (1) by taking reverse power dissipation and thermal runaway into consideration. The figures solve for a reference temperature as determined by equation (2). TA(max) = TR - RJAPF(AV) 30 115 (1) TA(max) = TJ(max) - RJAPF(AV) - RJAPR(AV) where TA(max) = Maximum allowable ambient temperature TJ(max) = Maximum allowable junction temperature (125C or the temperature at which thermal runaway occurs, whichever is lowest) PF(AV) = Average forward power dissipation PR(AV) = Average reverse power dissipation RJA = Junction-to-ambient thermal resistance TR = TJ(max) - RJAPR(AV) 40 Use line to center tap voltage for Vin. http://onsemi.com 3 40 PF(AV) , AVERAGE POWER DISSIPATION (WATTS) R JL, THERMAL RESISTANCE, JUNCTION-TO-LEAD (C/W) 1N5817, 1N5818, 1N5819 90 BOTH LEADS TO HEATSINK, EQUAL LENGTH 80 70 60 MAXIMUM 50 TYPICAL 40 30 20 10 1 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1.0 5.0 3.0 Sine Wave I(FM) = (Resistive Load) 2.0 I(AV) Capacitive 1.0 0.7 0.5 Loads dc 20 SQUARE WAVE 0.3 TJ 125C 0.2 0.1 0.07 0.05 0.2 0.4 0.6 0.8 1.0 2.0 IF(AV), AVERAGE FORWARD CURRENT (AMP) L, LEAD LENGTH (INCHES) Figure 4. Steady-State Thermal Resistance r(t), TRANSIENT THERMAL RESISTANCE (NORMALIZED) { 5 10 4.0 Figure 5. Forward Power Dissipation 1N5817-19 1.0 0.7 0.5 0.3 ZJL(t) = ZJL * r(t) 0.2 0.1 Ppk tp Ppk TIME 0.07 0.05 DUTY CYCLE, D = tp/t1 PEAK POWER, Ppk, is peak of an equivalent square power pulse. t1 TJL = Ppk RJL [D + (1 - D) r(t1 + tp) + r(tp) - r(t1)] where TJL = the increase in junction temperature above the lead temperature r(t) = normalized value of transient thermal resistance at time, t, from Figure 6, i.e.: r(t) = r(t1 + tp) = normalized value of transient thermal resistance at time, t1 + tp. 0.03 0.02 0.01 0.1 0.2 0.5 1.0 2.0 5.0 10 20 t, TIME (ms) 50 100 200 500 1.0k 2.0k Figure 6. Thermal Response Mounting Method 3 Mounting Method 1 NOTE 2. -- MOUNTING DATA P.C. Board with 1-1/2 x 1-1/2 copper surface. P.C. Board with 1-1/2 x 1-1/2 copper surface. Data shown for thermal resistance junction-to-ambient (RJA) for the mountings shown is to be used as typical guideline values for preliminary engineering, or in case the tie point temperature cannot be measured. L = 3/8 L L TYPICAL VALUES FOR RJA IN STILL AIR Lead Length, L (in) Mounting Method 1/8 1/4 1 52 65 2 67 80 3 1/2 50 3/4 RJA 72 85 C/W 87 100 C/W BOARD GROUND PLANE Mounting Method 2 L C/W L VECTOR PIN MOUNTING http://onsemi.com 4 5.0k 10k 1N5817, 1N5818, 1N5819 NOTE 3. -- THERMAL CIRCUIT MODEL (For heat conduction through the leads) RS(A) RL(A) RJ(A) RJ(K) TA(A) TC(A) TJ TL(K) (Subscripts A and K refer to anode and cathode sides, respectively.) Values for thermal resistance components are: RL = 100C/W/in typically and 120C/W/in maximum RJ = 36C/W typically and 46C/W maximum. TA = Ambient Temperature TC = Case Temperature TL = Lead Temperature TJ = Junction Temperature RS = Thermal Resistance, Heatsink to Ambient RL = Thermal Resistance, Lead to Heatsink RJ = Thermal Resistance, Junction to Case PD = Power Dissipation IFSM, PEAK SURGE CURRENT (AMP) 125 20 10 7.0 TC = 100C 3.0 25C 115 1 Cycle TL = 70C f = 60 Hz 105 95 85 Surge Applied at Rated Load Conditions 75 1.0 2.0 5.0 7.0 10 20 NUMBER OF CYCLES 3.0 1.0 30 70 100 40 Figure 8. Maximum Non-Repetitive Surge Current 0.7 0.5 30 20 0.3 I R, REVERSE CURRENT (mA) i F, INSTANTANEOUS FORWARD CURRENT (AMP) TA(K) TC(K) Use of the above model permits junction to lead thermal resistance for any mounting configuration to be found. For a given total lead length, lowest values occur when one side of the rectifier is brought as close as possible to the heatsink. Terms in the model signify: 2.0 RS(K) PD TL(A) 5.0 RL(K) 0.2 0.1 0.07 0.05 15 100C 5.0 3.0 2.0 75C 1.0 0.5 0.3 0.2 0.03 0.02 0.1 TJ = 125C 25C 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 0.05 0.03 vF, INSTANTANEOUS FORWARD VOLTAGE (VOLTS) 1N5817 1N5818 1N5819 0 4.0 8.0 12 16 20 24 28 32 VR, REVERSE VOLTAGE (VOLTS) Figure 7. Typical Forward Voltage Figure 9. Typical Reverse Current http://onsemi.com 5 36 40 1N5817, 1N5818, 1N5819 NOTE 4. -- HIGH FREQUENCY OPERATION 200 C, CAPACITANCE (pF) Since current flow in a Schottky rectifier is the result of majority carrier conduction, it is not subject to junction diode forward and reverse recovery transients due to minority carrier injection and stored charge. Satisfactory circuit analysis work may be performed by using a model consisting of an ideal diode in parallel with a variable capacitance. (See Figure 10.) Rectification efficiency measurements show that operation will be satisfactory up to several megahertz. For example, relative waveform rectification efficiency is approximately 70 percent at 2.0 MHz, e.g., the ratio of dc power to RMS power in the load is 0.28 at this frequency, whereas perfect rectification would yield 0.406 for sine wave inputs. However, in contrast to ordinary junction diodes, the loss in waveform efficiency is not indicative of power loss: it is simply a result of reverse current flow through the diode capacitance, which lowers the dc output voltage. 100 1N5817 70 1N5818 50 1N5819 30 TJ = 25C f = 1.0 MHz 20 10 0.4 0.6 0.8 1.0 2.0 4.0 6.0 8.0 10 VR, REVERSE VOLTAGE (VOLTS) Figure 10. Typical Capacitance http://onsemi.com 6 20 40 1N5817, 1N5818, 1N5819 PACKAGE DIMENSIONS AXIAL LEAD, DO-41 CASE 59-10 ISSUE S NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. 59-04 OBSOLETE, NEW STANDARD 59-09. 4. 59-03 OBSOLETE, NEW STANDARD 59-10. 5. ALL RULES AND NOTES ASSOCIATED WITH JEDEC DO-41 OUTLINE SHALL APPLY 6. POLARITY DENOTED BY CATHODE BAND. 7. LEAD DIAMETER NOT CONTROLLED WITHIN F DIMENSION. B K D F DIM A B D F K A F K http://onsemi.com 7 INCHES MIN MAX 0.161 0.205 0.079 0.106 0.028 0.034 --- 0.050 1.000 --- MILLIMETERS MIN MAX 4.10 5.20 2.00 2.70 0.71 0.86 --- 1.27 25.40 --- 1N5817, 1N5818, 1N5819 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. 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