1N3305 thru 1N3350B
and 1N4549B thru 1N4556B
50 WATT ZENER DIODES
SCOTTSDALE DIVISION
DESCRIPTION
These high power 50 W Zener diodes represented by the JEDEC
registered 1N3305 thru 1N3350B and 1N4549 thru 1N4556B 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.
APPEARANCE
WWW .
Microsemi
.C
OM
DO- 5
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
(DO-203AB)
FEATURES
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JEDEC registered 1N3305 thru 1N3350B and
1N4549 thru 1N4556B
Internal solder bond construction
Hermetically sealed (welded)
Zener Voltage 3.9V to 200V.
Also available in JAN, JANTX, and JANTXV
qualifications per MIL-PRF-19500/358 by adding
the JAN, JANTX, or JANTXV prefixes to part
numbers for desired level of screening; (e.g.
JANTX1N3305B, JANTXV1N3318B, etc.
Standard polarity is anode to case
Reverse polarity with cathode to case by
designating R suffix in part number, e.g.
1N3305RB, 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
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MAXIMUM RATINGS
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Junction & Storage Temperatures: -65
o
C to +175
o
C
DC Power Dissipation: 50 watts at T
C
< 75
o
C
Power Derating: 0.5 W/
o
C above 75
o
C
Forward Voltage @ 10 A: 1.5 Volts
THERMAL RESISTANCE: 2.0
o
C/W maximum
junction to hexagonal base (1.5
o
C/W typical)
Solder temperatures: 260
o
C for 10 s (max)
•
MECHANICAL AND PACKAGING
CASE: Industry Standard DO-5 (DO-203AB),
11/16 inch hexagonal stud with 1/4-28 threads
welded hermetically sealed metal and glass
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, bushing, solder terminal,
washers and nut
See package dimensions on last page
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1N3305 – 1N3350B
350B
1N4549B – 1N4556B
1N4549B – 1N4556B
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Copyright
2003
11-12-2003 REV A
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
1N3305 thru 1N3350B
and 1N4549B thru 1N4556B
50 WATT ZENER DIODES
SCOTTSDALE DIVISION
See further notes on following page
NOTES:
1.
When using JEDEC numbers an R suffix should be used to signify reversed polarity. The suffixes A and B indicate tolerances
of 10% and 5% respectively. No suffix or just R denotes +/-20% tolerance. Example: 1N3319RB is a REVERSED polarity,
20 volt unit having a +/-5% tolerance on Zener Voltage.
Zener Voltage (
V
Z
) is measured with junction in thermal equilibrium with 30 C stud temperature.
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 three representative types is shown in Figure 2. Also see Microsemi MicroNote 202.
o
WWW .
Microsemi
.C
OM
2.
3.
OUTLINE AND CIRCUIT
Rated Power Dissipation - Watts
Stud Temperature C
o
FIGURE 1
Power Derating Curve
FIGURE 2
Typical Zener Impedance
vs. Zener Current
PACKAGE DIMENSIONS
1N3305 – 1N3350B
350B
1N4549B – 1N4556B
1N4549B – 1N4556B
All Dimensions in: INCH
mm
Copyright
2003
11-12-2003 REV A
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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