DESCRIPTION These high power 50 W Zener diodes represented by the JEDEC registered 1N2804 thru 1N2846B and 1N4557 thru 1N4564B series provide voltage regulation in a selection over 200 V broad range of voltages. They may be operated 50 W with adequate mounting and heat sinking with their low thermal resistance. These Zeners are also available in JAN, JANTX, JANTXV military qualifications. Microsemi also offers numerous other Zener products to meet higher and lower power applications.

JEDEC registered 1N2804 thru 1N2846B and 1N4557 thru 1N4564B Internal solder bond construction Hermetically sealed (welded) Zener Voltage to 200V. Also available in JAN, JANTX, and JANTXV qualifications per MIL-PRF-19500/114 by adding the JAN, JANTX, or JANTXV prefixes to part numbers for desired level of screening; (e.g. JANTX1N2804B, etc. Standard polarity is anode to case Reverse polarity with cathode to case by designating R suffix in part number, e.g. 1N2804RB, etc. Consult factory for surface mount equivalents

Regulates voltage over a broad operating current and temperature range Standard voltage tolerances are 5% with B suffix, +/-10% with an A suffix, and +/-20% with no suffix Consult factory for or +/-1% with or D suffix respectively Reverse polarity available Nonsensitive to ESD per MIL-STD-750 Method 1020 Inherently radiation hard as described in Microsemi MicroNote 050

Junction Temperatures: +175 C Storage Temperatures: +200oC DC Power Dissipation: 50 watts 75 oC Power Derating: 0.5W/oC above 75oC Forward Voltage A: 1.5 Volts THERMAL RESISTANCE: 2.0 oC/W maximum o junction to base (1.5 C/W typical) Solder temperatures: 260 oC for 10 s (max)

CASE: Industry Standard TO-3 (TO-204AD), hermetically sealed, 0.052 inch diameter pins. FINISH: All external surfaces are corrosion resistant and terminal solderable. POLARITY: Standard Polarity units are connected anode to case. Reverse polarity (cathode to case) is indicated by Suffix R in part number WEIGHT: 15 grams. MOUNTING HARDWARE: Consult factory for optional insulator and sheet metal screws See package dimensions on last page

Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

*JEDEC Registered Data. **Not JEDEC Data. Have JAN, JANTX and JANTXV Qualifications to MIL-S-19500/114.

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. o Zener Voltage (VZ) is measured with junction in thermal equilibrium with 30 C base temperature. The test currents (IZT) have been selected o so that at nominal voltages the dissipation is a constant 12.5 watts. This results in a nominal junction temperature rise 18.75 C. The zener impedance is derived from the 60 cycle ac voltage, which results when an ac current having an rms value equal 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. 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.

Rated Power Dissipation - Watts Typical circuit connections for anode-to-case and cathode-to-case polarities (standard and reverse polarities, respectively).