1N2804 thru 1N2846B and
1N4557 thru 1N4564B
50 Watt Zener Diodes
SCOTTSDALE DIVISION
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 a 3.9 V to 200 V broad range of voltages. They
may be operated up to 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.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
APPEARANCE
WWW .
Microsemi
.C
OM
TO-3
(TO-204AD)
FEATURES
•
•
•
•
•
JEDEC registered 1N2804 thru 1N2846B and
1N4557 thru 1N4564B
Internal solder bond construction
Hermetically sealed (welded)
Zener Voltage 3.9V 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
•
•
APPLICATIONS / BENEFITS
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 +/-2% or +/-1% with a C 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
•
•
•
•
•
•
•
MAXIMUM RATINGS
•
•
•
•
•
•
•
Junction Temperatures: -65
o
C to +175
o
C
Storage Temperatures: -65
o
C to +200
o
C
DC Power Dissipation: 50 watts at T
C
< 75
o
C
Power Derating: 0.5W/
o
C above 75
o
C
Forward Voltage @ 10 A: 1.5 Volts
THERMAL RESISTANCE: 2.0
o
C/W maximum
o
junction to base (1.5 C/W typical)
Solder temperatures: 260
o
C for 10 s (max)
•
•
•
MECHANICAL AND PACKAGING
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 either example, both
pins are common with one another as anode or
cathode (see circuit on last page).
WEIGHT: 15 grams.
MOUNTING HARDWARE: Consult factory for
optional insulator and sheet metal screws
See package dimensions on last page
•
•
•
1N2804 - 46B &
1N4557B – 64B
Copyright
2003
2-19-2004 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
1N2804 thru 1N2846B and
1N4557 thru 1N4564B
50 Watt Zener Diodes
SCOTTSDALE DIVISION
NOTES:
1.
2.
3.
4.
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 (V
Z
) is measured with junction in thermal equilibrium with 30 C base temperature. The test currents (I
ZT
) 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 of 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 to 10% of the dc
zener current (I
ZT
or I
ZK
) is superimposed on I
ZT
or I
ZK
. 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 I
ZM
are calculated for a +/-5% tolerance on nominal zener voltage. Allowance has been made for the rise in zener voltage
above V
ZT
that results from zener impedance and the increase in junction temperature as power dissipation approaches 50 watts. In the
case of individual diodes, I
ZM
is that value of current that results in a dissipation of 50 watts.
WWW .
Microsemi
.C
OM
GRAPHS AND CIRCUITS
Rated Power Dissipation - Watts
Typical circuit connections for anode-to-case and
cathode-to-case polarities (standard and reverse
polarities, respectively).
Case
Temperature C
o
FIGURE 2
POWER DERATING CURVE
1N2804 - 46B &
1N4557B – 64B
FIGURE GROUP 3
TYPICAL ZENER IMPEDANCE vs. ZENER CURRENT FOR TYPES SHOWN
Copyright
2003
2-19-2004 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
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