MOTOROLA SC {DIODES/OPTO} | DE D BP b367255 an79633 r T-01-19 | MOTOROLA IN3491 ' m= SEMICONDUCTO a thru = TECHNICAL DATA 1N3495 Designers Data Sheet _- SILICON RECTIFIERS ; 25 AMPERE MEDIUM-CURRENT SILICON RECTIFIERS 50-400 VOLTS" DIFFUSED JUNCTION . .compact, highly efficient silicon rectifiers. Designer's Data for Worst Case" Conditions The Designers Data Sheet permits the design of most circuits entirely from the information presented. Limit curves represent- ing device characteristics boundarias are given to facilitate worst case design. : *MAXIMUM RATINGS Rating Symbol 1N3491 1N3492 1N3493 1N3494 1N3495 Unit Peak Repetitive Reverse Voltage VRRM 50 100 200 300 400 Volts Working Peak Reverse Voltage VRWM DC Blocking Voltage VR RMS Reverse Voltage VRIRMS) 35 70 140 210 280 Volts Average Rectified Forward Current lo 25 Amp (Single phase, resistive load, 60 Hz, . see Figure 3) Tc = 100C ; ~e, Nonrepetitive Peak Surge Current lesm 300 (for 1/2 cycle) Amp (surge applied at rated loati conditions, see Figure 5) - Operating and Storage Junction Ty. Tstg . 65 to +175 c Temperature Range - THERMAL CHARACTERISTICS Characteristic Symbol Max Unit Thermal Resistance, Junction to Case Rec 1,2 c/Watt MECHANICAL CHARACTERISTICS CASE: Welded, hermetically sealed construction. FINISH: All external surfaces corrosion-resistant and the terminal lead is readily solderable. POLARITY: CATHODE TO CASE (reverse polarity units are available upon request and are designated by an "R suffix i.e, MR327R or 1N3491R). MOUNTING POSITIONS: Any. TEEEEEEE Bt Raat 12% = =~. CASE 43-02 *Indicates JEDEC registered data for 1N3491-1 N3495 METAL 3-7L2E D i b3b7255 9079534 ey - MOTOROLA SC {IDIODES/0PTO} FO 4 ip, INSTANTANEOUS FORWARD CURRENT (AMP? 1N3491 thru 1N3495 "ELECTRICAL CHARACTERISTICS M14 Characteristic and Conditions Symbol Max Unit instantaneous Forward Voltage Drop {ig = 57 Amps, Ty = 25C) VE 1.7 Volts Full Cycle Average Reverse Current (18 Amp AV and V,, single phase, IRIAV) mA 60 Hz, Tc = 160C) 1N3494 10 1N3492 10 1N3493 . 8.0 4N3494 6.0 1N3495 4.0 DC Reverse Current IR mA (Rated Vp, Tc = 25C) 1,0 FIGURE 1 MAXIMUM FORWARD VOLTAGE DROP 2 82 ss Ty= W5C 8 10 60 - 40 20 10 06 04 02 02 0 04 08 12 16 20 24 Vp, MAXIMUM FORWARD VOLTAGE DROP (VOLTS) Petavy AVERAGE FORWARD POWER DISSIPATION (WATTS) 3-8 FIGURE 2 MAXIMUM-FORWARD POWER DISSIPATION y= 60 CONDUCTION (6 PHASE STAR) 120 CONDUCTION (3 PHASE, HALF WAVE OR FULL WAVE, OR 6 PHASE WiTH INTERPHASE} 380 CONDUCTION (E PRASE, HALF WAVE OR FULL WAVE} 10 20 30 40 50 60 Ietavy. AVERAGE FORWARD CURRENT (AMP)MOTOROLA SC {DIODES/OPTO}F Tolniq 12E D Bj b3bress 0079535 4 1 1N3491 thru 1N3495 FIGURE 3~ MAXIMUM CURRENT RATINGS i 0 40 : g S 3% DC, CONTINUOUS 35 ' Ey 1 PHASE x0 2 (HAL WAVE OR FULL WAVE = 180 CONDUCTION x 25 25 z } 2 ; 3 PHASE 3 2 (HALE WAVE OR FULL WAVED 20 2 - 120 2 i & 6 PHASE STAR 8 olL4 60 CONDUCTION 0 BE = 8} 5 z |__. Fy, : 0 0 100 110 320 130 140 10 ~OC~CCD , Te, CASE TEMPERATURE (C! FIGURE 4 MAXIMUM EFFECTIVE TRANSIENT THERMAL IMPEDANCE Ty To = Osetn Pav 4 @xcyy EFFECTIVE TRANSIENT JUNCTION TO CASE THERMAL IMPEDANCE (C/WATT) Oo. 02 Os 10 20 50 0 - 2 50 100 200 50) 1000 t TIME (ms) : FIGURE 5 MAXIMUM ALLOWABLE SURGE CURRENT z = SURGE APPLIED AT RATED 'S LOAD CONDITIONS = Vantjesp) APPLIED AFTER SURGE ew NON-REPETITIVE (MAX 500 SURGES DURING DEVICE LIFETIME = REPETITIVE (UNLIMITED NUMBER OF SURGES, T) < 175C BEFORE SURGE APPLIED] g : 3 : lmievuref i . 2 10 20 50 10 20 50 100 200 500 1000 CYCLES AT 60 Hz 3-9+: MOTOROLA SC {DIODES/OPTO} 4. Cy_ Iq 1N3491 thru 1N3495 17E D i b367255 00795536 & i TYPICAL DYNAMIC CHARACTERISTICS FIGURE 6 RECTIFICATION EFFICIENCY 100 = 70 # ~ # 50 Ty = 175% 3S 6 S 5 CURRENT INPUT WAVEFORM x 30 20 10 20 30 50 70 10 20 30 REPETITION RECOVERY {kHz FIGURE 8 JUNCTION CAPACITANCE 1000 700 00 300 % 20 2 = 100 S 3 70 3 50 30 20 10 - 10 20 #30 50 70 10 2 = Vp, REVERSE VOLTAGE (VOLTS) ee 7 a oie & vewon tne Es] a L B + Za * GoD " =| Fe c4e9 + cool on BEAT SN MOUNT 3. 4. $. The pressing force should be applied evenly about the shoulder ring to avoid tilting or canting FIGURE 7 REVERSE RECOVERY TIME tee, REVERSE RECOVERY TIME (125) Ih =I t, 02 03 #05 07 10 20 30 50 7.0 10 In/Ng, RATIO OF REVERSE 70 FORWARD CURRENT 50 70 100 Ol FIGURE 9 FORWARD RECOVERY TIME 1, = 25C 07 a 2 Pry o he ti, FORWARD RECOVERY TIME (js) OL 50 70 100 10 20 ip, FORWARD PULSE CURRENT (AMPS) 3.0 5.0 70 10 MOUNTING PROCEDURES MR327-MR331 and N3491-1N3495 rectifiers are designed to be press-fitted in a heat sink in order to attain full device ratings. Recommended procedures for this type of mounting are as follows: i. 2. Driil a hole in the heat sink 0.499 + .001 inch in diameter. Break the hole edge as shown to prevent shearing off the knurted edge of the rectifier when It is pressed into the hole. The depth and width of the break should be 0.010 inch maximum to retain maximum heat sink surface contact. To prevent damage to the rectifier during press-in, the pressing force should be applied only on the shoulder ring of the rectifier case as shown In the figure. . of the rectifier case in the hole during the press-in operation. Also, the use of a light industrial lubricant will be of considerable aid.