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## 1N5819 Datasheet(PDF) 2 Page - Motorola, Inc

 Part # 1N5819 Description SCHOTTKY BARRIER RECTIFIERS 1 AMPERE 20, 30 and 40 VOLTS Download 6 Pages Scroll/Zoom 100% Manufacturer MOTOROLA [Motorola, Inc] Direct Link http://www.freescale.com Logo

## 1N5819 Datasheet(HTML) 2 Page - Motorola, Inc

 2 / 6 page1251151059585752015107.05.04.03.02.0°VR, DC REVERSE VOLTAGE (VOLTS)Figure 1. Maximum Reference Temperature1N58174030236080RθJA (°C/W) = 1101251151059585752015107.05.0304.03.0403023RθJA (°C/W) = 1108060Figure 2. Maximum Reference Temperature1N58181251151059585752015107.05.0304.040RθJA (°C/W) = 1106080Figure 3. Maximum Reference Temperature1N5819CircuitLoadHalf WaveResistiveCapacitive*Full Wave, BridgeResistiveCapacitiveFull Wave, Center Tapped* †ResistiveCapacitiveSine WaveSquare Wave0.50.751.31.50.50.750.650.751.01.51.31.5403023°VR, DC REVERSE VOLTAGE (VOLTS)VR, DC REVERSE VOLTAGE (VOLTS)*Note that VR(PK) ≈ 2.0 Vin(PK).† Use line to center tap voltage for Vin.Table 1. Values for Factor F°1N5817 1N5818 1N58192Rectifier Device DataNOTE 1 — DETERMINING MAXIMUM RATINGSReverse power dissipation and the possibility of thermal runawaymust be considered when operating this rectifier at reverse voltagesabove 0.1 VRWM. Proper derating may be accomplished by use ofequation (1).TA(max) =where TA(max) =TJ(max) =PF(AV) =PR(AV) =RθJA =TJ(max) – RθJAPF(AV) – RθJAPR(AV)Maximum allowable ambient temperatureMaximum allowable junction temperature(1)Average forward power dissipation(125°C or the temperature at which thermalrunaway occurs, whichever is lowest)Average reverse power dissipationJunction–to–ambient thermal resistanceFigures 1, 2, and 3 permit easier use of equation (1) by taking re-verse power dissipation and thermal runaway into consideration. Thefigures solve for a reference temperature as determined by equation(2).TR = TJ(max) – RθJAPR(AV)(2)Substituting equation (2) into equation (1) yields:TA(max) = TR – RθJAPF(AV)(3)Inspection of equations (2) and (3) reveals that TR is the ambienttemperature at which thermal runaway occurs or where TJ = 125°C,when forward power is zero. The transition from one boundary condi-tion to the other is evident on the curves of Figures 1, 2, and 3 as adifference in the rate of change of the slope in the vicinity of 115°C. Thedata of Figures 1, 2, and 3 is based upon dc conditions. For use in com-mon rectifier circuits, Table 1 indicates suggested factors for an equiv-alent dc voltage to use for conservative design, that is:(4)VR(equiv) = Vin(PK) x FThe factor F is derived by considering the properties of the various rec-tifier circuits and the reverse characteristics of Schottky diodes.EXAMPLE: Find TA(max)for1N5818operatedina12–voltdcsupplyusing a bridge circuit with capacitive filter such that IDC=0.4A(IF(AV)=0.5 A), I(FM)/I(AV) = 10, Input Voltage = 10 V(rms), RθJA = 80°C/W.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 = 109°CStep 1. Find @ VR = 9.2 V and RθJA = 80°C/W.Step 3. Find PF(AV) from Figure 4. **Read PF(AV) = 0.5 W@I(FM)I(AV)= 10 and IF(AV) = 0.5 A.Step 4. Find TA(max) from equation (3).Step 4. Find TA(max) = 109 – (80) (0.5) = 69°C.**Values given are for the 1N5818. Power is slightly lower for the1N5817 because of its lower forward voltage, and higher for the1N5819.

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