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1N2835A Datasheet(PDF) 3 Page - Microsemi Corporation |
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1N2835A Datasheet(HTML) 3 Page - Microsemi Corporation |
3 / 4 page 50 Watt Zener Diodes SCOTTSD A L E DIVISION 1N2804 thru 1N2846B and 1N4557 thru 1N4564B NOTES: 1. The JEDEC type numbers shown (B suffix) have a +/- 5% tolerance on nominal zener voltage. The suffix A is used to identify +/-10% tolerance; no suffix indicates +/-20% tolerance. If tighter tolerance is required, consult factory. Standard polarity units have the anode connected to the case. Reverse polarity (cathode-to-case) units are available and are indicated by suffix R in the part number. 2. Zener Voltage (VZ) is measured with junction in thermal equilibrium with 30 oC base temperature. The test currents (IZT) have been selected so that at nominal voltages the dissipation is a constant 12.5 watts. This results in a nominal junction temperature rise of 18.75 oC . 3. The zener impedance is derived from the 60 cycle ac voltage, which results when an ac current having an rms value equal to 10% of the dc zener current (IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at 2 points to ensure a sharp knee on the breakdown curve and to eliminate unstable units. A curve showing the variation of zener impedance vs. zener current for six representative types is shown in Figure 3. Also see MicroNote 202 for further information. 4. The values of IZM are calculated for a +/-5% tolerance on nominal zener voltage. Allowance has been made for the rise in zener voltage above VZT that results from zener impedance and the increase in junction temperature as power dissipation approaches 50 watts. In the case of individual diodes, IZM is that value of current that results in a dissipation of 50 watts. GRAPHS AND CIRCUITS Typical circuit connections for anode-to-case and cathode-to-case polarities (standard and reverse polarities, respectively). Case Temperature oC FIGURE 2 POWER DERATING CURVE FIGURE GROUP 3 TYPICAL ZENER IMPEDANCE vs. ZENER CURRENT FOR TYPES SHOWN Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 3 Copyright 2003 11-12-2003 REV A |
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