8700 E. Thomas Road
Scottsdale, AZ 85252
Phone: (480) 941-6300
Fax: (480) 947-1503
SMAJ4728A
THRU
SMAJ4764A
SILICON
2 WATT
ZENER DIODES
DO-214AC
(SMAJ)
Features
• For surface mount applications (flat handling surface for
accurate placement)
• 3.3 thru 100 Volt Voltage Range
• High Surge Current Rating
• Higher Voltages Available
• Electrically Equivalent to JEDEC Registered 1N4728A thru
1N4764A
• Available on Tape and Reel.
DIMENSIONS
INCHES MM
DIM MIN MAX MIN MAX NOTE
A.078 .115 1.98 2.92 1
B.052 .058 1.32 1.47
C--- .005 --- .127
D--- .02 --- .51
E.030 .060 .76 1.52
F.055 .075 1.65 2.13
G.194 .216 4.93 5.48
H.160 .180 3.99 4.50
J.100 .110 2.57 2.79
NOTE 1: THIS MAXIMUM DIMENSION IS LARGER THAN THE STANDARD
JEDEC CALL OUT. STANDARD JEDEC IS .105 INCHES OR 2.66 MM.
Mechanical Data
• Package similar to JEDEC DO-214AC (see dimension ‘A’ note)
• Terminals solderable per MIL-STD-750, Method 2026
• Polarity is indicated by cathode band.
• Maximum temperature for soldering: 260oC for 10 seconds.
• For surface mount applications with flame retardent epoxy
meeting UL94V-0
Maximum Ratings @ 25°°C Unless Otherwise Specified
Maximum Forward
Voltage VF1.2V (Note: 1)
Peak Surge Current IsSee Table 1
Steady State Power
Dissipation P(AV) 2.0W (Note: 2,3)
Operating And
Storage
Temperatures TJ ,TSTG -55°C to
+150°C
Thermal Resistance RθJL 25oC/W
NOTES:
1. Forward Current @ 200mA.
2. Mounted on 4.0mm2 copper pads to each terminal.
3. Lead temperature at 100°C or less. Derate linearly above 100°C to zero
power at 150°C.
Data Sheet#MSC0284A.PDF
Date: 05/01/97
H
J
E
F
G
A
B
D
C
0.075
0.095”
0.078
PAD LAYOUT
Electrical Characteristics @ 25°°C Unless Otherwise Specified
PART
NUMBER ZENER
VOLTAGE
(VZ)
(NOTE 4)
TEST
CURRENT
(IZT)
MAXIMUM
DYNAMIC
IMPEDANCE
(ZZT @ IZT)
(NOTE 2)
MAXIMUM
REVERSE
CURRENT
(IR @ VR)
TEST
VOLTAGE
(VR)
MAXIMUM
REGULATOR
CURRENT
(IZM)
TL = 100oC
MAXIMUM
KNEE
IMPEDANCE
(ZZK @ IZK)
(NOTE 2)
TEST
CURRENT
(IZK)
MAXIMUM
(SURGE)
CURRENT
(IS)
(NOTE 3)
VOLTS mA OHMS µµAVOLTS MA OHMS mA mA
SMAJ4728A 3.3 76 10 100 1 552 400 1.0 1380
SMAJ4729A 3.6 69 10 100 1 504 400 1.0 1260
SMAJ4730A 3.9 64 9 50 1 468 400 1.0 1190
SMAJ4731A 4.3 58 9 10 1 434 400 1.0 1070
SMAJ4732A 4.7 53 8 10 1 386 500 1.0 970
SMAJ4733A 5.1 49 7 10 1 356 550 1.0 890
SMAJ4734A 5.6 45 5 10 2 324 600 1.0 810
SMAJ4735A 6.2 41 2 10 3 292 700 1.0 730
SMAJ4736A 6.8 37 3.5 10 4 266 700 1.0 660
SMAJ4737A 7.5 34 4.0 10 5 242 700 0.5 605
SMAJ4738A 8.2 31 4.5 10 6 220 700 0.5 550
SMAJ4739A 9.1 28 5.0 10 7 200 700 0.5 500
SMAJ4740A 10 25 7 10 7.6 182 700 0.25 454
SMAJ4741A 11 23 8 5 8.4 166 700 0.25 414
SMAJ4742A 12 21 9 5 9.1 152 700 0.25 380
SMAJ4743A 13 19 10 5 9.9 138 700 0.25 344
SMAJ4744A 15 17 14 5 11.4 132 700 0.25 304
SMAJ4745A 16 15.5 16 5 12.2 114 700 0.25 285
SMAJ4746A 18 14 20 5 13.7 100 750 0.25 250
SMAJ4747A 20 12.5 22 5 15.2 90 750 0.25 225
SMAJ4748A 22 11.5 23 5 16.7 82 720 0.25 205
SMAJ4749A 24 10.5 25 5 18.2 76 750 0.25 190
SMAJ4750A 27 9.5 35 5 20.6 68 750 0.25 170
SMAJ4751A 30 8.5 40 5 22.8 60 1000 0.25 150
SMAJ4752A 33 7.5 45 5 25.1 54 1000 0.25 135
SMAJ4753A 36 7.0 50 5 27.4 50 1000 0.25 125
SMAJ4754A 39 6.5 60 5 29.7 46 1000 0.25 115
SMAJ4755A 43 6.0 70 5 32.7 44 1500 0.25 110
SMAJ4756A 47 5.5 80 5 35.8 38 1500 0.25 95
SMAJ4757A 51 5.0 95 5 38.8 36 1500 0.25 90
SMAJ4758A 56 4.5 110 5 42.6 32 2000 0.25 80
SMAJ4759A 62 4.0 125 5 47.1 28 2000 0.25 70
SMAJ4760A 68 3.7 150 5 51.7 26 2000 0.25 65
SMAJ4761A 75 3.3 175 5 56.0 24 2000 0.25 60
SMAJ4762A 82 3.0 200 5 62.2 22 3000 0.25 55
SMAJ4763A 91 2.8 250 5 69.2 20 3000 0.25 50
SMAJ4764A 100 2.5 350 5 76.0 18 3000 0.25 45
SMAJ4728A thru SMAJ4764A
NOTE:
1. The type numbers shown have a 5% tolerance on nominal zener voltage. No suffix signifies a 10% tolerance, C signifies 2%, and D signifies 1% tolerance.
2. The Zener impedance is derived from the 60 Hz 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 I ZT. Zener impedance is measured at two points to insure a sharp knee on the breakdown curve and
eliminate unstable units.
3. The reverse surge current is measured at 25 oC ambient using a ½ square wave or equivalent sine wave pulse 1/120 second duration superimposed
on IZT.
4. Voltage at thermal equilibrium or 90 seconds after application of dc current.
About
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MSC COLORADO
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MSC SCOTTSDALE
Microsemi Corporation (“MSC”) is committed to support those customers requiring RoHS and/or
Pb-free (Lead free) compliant components. The term Pb-free (Lead-free) is defined in JESD97 and
applies to components in which the Lead (Pb) level in any of the raw materials and the end product
MSC PPG - Switching
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Microsemi Corporation (MSC) is committed to manage its business in an environmentally
responsible manner and Microsemi has RoHS and Pb-free initiatives to support those customers
that require RoHS compliant and/or Pb-free products.
Most plastic encapsulated products will be transitioned to a Pb-free finish and also use mold
compounds that are RoHS compliant for a 260C reflow temperature. For additional information
regarding Pb-free or RoHS compliant products, the customer should contact the Microsemi
Division that provides that product.
Hermetic military products manufactured by Microsemi are
processed in accordance with requirements specified by MIL-
PRF-19500, MIL-PRF-38534 and MIL-PRF-38535. These
requirements do not allow termination finishes that are Pb-free
or RoHS compliant. If RoHS compliant hermetic products for
equivalent commercial part numbers are required, the customer
should contact the applicable Microsemi Division.
In the case of Plastic Encapsulated and Commercial Hermetic
packages, Microsemi may offer two versions of a product where
one version will be RoHS compliant and the other will not be
compliant. In those examples, the RoHS compliant version will
include an "e#" designator as a suffix to the Part Number
indicating the Pb-free 2nd level interconnect terminal finish
category defined in JESD97. In these offerings, the most
frequent terminal finish is pure Tin and the suffix of the part
number is "e3".
http://www.microsemi.com/pbpolicy.asp Go
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is less than or equal to 0.1% by weight and also meets any Pb-free requirements/definitions
adopted by the RoHS Directive 2002/95/EC. The RoHS term is an acronym for European
Directive, Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic
E
quipment. This also means a component with Pb-free termination finish compatible with Pb-free
soldering processes. The RoHS compliant components may include Pb in the internal high melting
type solder connections or glass materials of the component as defined in the exemptions of the
RoHS European Directive.
Although the RoHS directive requires the use of Pb-free lead finish and solder processes, there has
been a historical concern about the growth of Tin whiskers when using these Pb-free processes.
The most common Pb-free lead finish currently being used is 100% Matte Tin (Sn) and several IC
manufacturers have shown that this lead finish is much less prone to whisker formation than older
bright tin finishes. Microsemi will provide the reliability and tin whisker growth data that has been
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ASA website on Tin whiskers: Nasa
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CALCE Tin Whisker Working Group CALCE
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