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SCOTTSDALE DIVISION
1N4728UR-1 thru 1N4764AUR-1,e3
(or MLL4728A-1 thru MLL4764A-1,e3)
METALLURGICALLY BONDED GLASS
SURFACE MOUNT 1.0 W ZENERS
DESCRIPTION
This surface mountable 1 watt Zener diode series is electrically equivalent to
the 1N4728A thru 1N4764A registration in the DO-41 equivalent package
except that it meets the JEDEC surface mount outline DO-213AB and also
includes enhanced internal contact design. It is an ideal selection for
applications of high density and low parasitic requirements for voltage
regulation. Standard voltage tolerance is +/-5% with tighter tolerances
available down to 1%. With its glass hermetic qualities, it may also be used
for high reliability applications when required by a source control drawing
(SCD).
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
APPEARANCE
DO-213AB
FEATURES
Electrically similar to the JEDEC registered 1N4728
thru 1N4764 zener series
Zener voltages available 3.3V to 100V
Standard voltage tolerances are +/- 5% with “A” suffix
and 10 % with no suffix identification
Tight tolerances available in plus or minus 2% or 1%
with C or D suffix respectively
Options for screening in accordance with MIL-PRF-
19500 for JAN, JANTX, JANTXV, and JANS are
available by adding MQ, MX, MV, or MSP prefixes
respectively to part numbers.
Surface mount equivalents also available as
SMAJ4728A to SMAJ4764A and SMAJ4728A to
SMAJ4764A
RoHS Compliant devices available by adding “e3” suffix
Plastic body axial-leaded Zener equivalents are also
available as 1N4728A to 1N4764A
MAXIMUM RATINGS
Power dissipation at 25ºC: 1.0 watts (also see derating
in Figure 1).
Operating and Storage temperature: -65ºC to +175ºC
Thermal Resistance: 40 ºC/W junction to end cap, or
120ºC/W junction to ambient when mounted on FR4 PC
board (1 oz Cu) with recommended footprint (see last
page)
Steady-State Power: 1.00 watts at TEC < 135oC, or
1.00 watts at TA < 55ºC when mounted on FR4 PC
board and recommended footprint as described for
thermal resistance (also see Figure 1)
Forward voltage @200 mA: 1.2 volts (maximum)
Solder Temperatures: 260 ºC for 10 s (max)
APPLICATIONS / BENEFITS
Regulates voltage over a broad operating current
and temperature range
Metallurgically enhanced internal contact design fro
greater reliability and lower thermal resistance
Wide selection from 3.3 to 100 V
Leadless package for surface mounting
Ideal for high density mounting
Nonsensitive to ESD
Hermetically sealed glass package
Specified capacitance (see Figure 2)
Inherently radiation hard per MicroNote 050
MECHANICAL AND PACKAGING
CASE: Hermetically sealed DO-213AB glass MELF
TERMINALS: Tin-Lead (Sn/Pb) or RohS Compliant
annealed matte-Tin plating solderable per MIL-STD-
750, method 2026
POLARITY: Cathode indicated by band. Diode to
be operated with the banded end positive with
respect to the opposite end for Zener regulation
MARKING: Cathode band only
TAPE & REEL optional: Standard per EIA-481-B
with 12 mm tape, 1500 per 7 inch reel or 5000 per
13 inch reel (add “TR” suffix to part number)
WEIGHT: 0.05 grams
See package dimensions & recommended mounting
pad on last page
Copyright © 2005
10-18-2005 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

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SCOTTSDALE DIVISION
1N4728UR-1 thru 1N4764AUR-1,e3
(or MLL4728A-1 thru MLL4764A-1,e3)
METALLURGICALLY BONDED GLASS
SURFACE MOUNT 1.0 W ZENERS
ELECTRICAL CHARACTERISTICS @ TC = 30oC
TYPE
NUMBER
(NOTE 1 & 5)
1N4728AUR-1
1N4729AUR-1
1N4730AUR-1
1N4731AUR-1
1N4732AUR-1
1N4733AUR-1
1N4734AUR-1
1N4735AUR-1
1N4736AUR-1
1N4737AUR-1
1N4738AUR-1
1N4739AUR-1
1N4740AUR-1
1N4741AUR-1
1N4742AUR-1
1N4743AUR-1
1N4744AUR-1
1N4745AUR-1
1N4746AUR-1
1N4747AUR-1
1N4748AUR-1
1N4749AUR-1
1N4750AUR-1
1N4751AUR-1
1N4752AUR-1
1N4753AUR-1
1N4754AUR-1
1N4755AUR-1
1N4756AUR-1
1N4757AUR-1
1N4758AUR-1
1N4759AUR-1
1N4760AUR-1
1N4761AUR-1
1N4762AUR-1
1N4763AUR-1
1N4764AUR-1
ZENER
VOLTAGE
(NOTE 4)
VZ
Volts
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
82
91
100
TEST
CURRENT
IZT
mA
76
69
64
58
53
49
45
41
37
34
31
28
25
23
21
19
17
15.5
14
12.5
11.5
10.5
9.5
8.5
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.7
3.3
3.0
2.8
2.5
MAXIMUM
DYNAMIC
IMPEDANCE
(Note 2)
ZZT @ IZT
Ohms
10
10
9
9
8
7
5
2
3.5
4.0
4.5
5.0
7
8
9
10
14
16
20
22
23
25
35
40
45
50
60
70
80
95
110
125
150
175
200
250
350
MAXIMUM
REVERSE
CURRENT
IR @ VR
μA
100
100
50
10
10
10
10
10
10
10
10
10
10
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
TEST
VOLTAGE
VR
Volts
1
1
1
1
1
1
2
3
4
5
6
7
7.6
8.4
9.1
9.9
11.4
12.2
13.7
15.2
16.7
18.2
20.6
22.8
25.1
27.4
29.7
32.7
35.8
38.8
42.6
47.1
51.7
56.0
62.2
69.2
76.0
MAXIMUM
REGULATOR
CURRENT
TA = 50oC
IZM
mA
276
252
234
217
193
178
162
146
133
121
110
100
91
83
76
69
61
57
50
45
41
38
34
30
27
25
23
22
19
18
16
14
13
12
11
10
9
MAXIMUM
KNEE
IMPEDANCE
(NOTE2)
ZZK @ IZK
Ohms
400
400
400
400
500
550
600
700
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
2000
2000
2000
3000
3000
3000
TEST
CURRENT
IZK
mA
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
MAXIMUM
(SURGE)
CURRENT
(NOTE 3)
IS
mA
1380
1260
1190
1070
970
890
810
730
660
605
550
500
454
414
380
344
304
285
250
225
205
190
170
150
135
125
115
110
95
90
80
70
65
60
55
50
45
NOTE 1: The type numbers shown with an “A” suffix have a +/-5% tolerance on the nominal Zener voltage. It is also available with suffix
“C” for +/-2%, and “D” for +/-1%. The absence of a suffix letter denotes +/- 10% tolerance.
NOTE 2: The Zener impedance is derived from the 60Hz 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 two points to ensure a sharp
knee on the breakdown curve and eliminate unstable units.
NOTE 3: The reverse surge current is measured at 25oC ambient using a ½ square wave or equivalent sine wave pulse 1/120 second
duration superimposed on IZT.
NOTE 4: Voltage measurements to be performed 90 seconds after application of dc current.
NOTE 5: This product series has also been previously identified as the MLL4728A-1 thru MLL4764A-1 series. This alternate name may
still be used.
Copyright © 2005
10-18-2005 REV A
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2

No Preview Available !

SCOTTSDALE DIVISION
1N4728UR-1 thru 1N4764AUR-1,e3
(or MLL4728A-1 thru MLL4764A-1,e3)
METALLURGICALLY BONDED GLASS
SURFACE MOUNT 1.0 W ZENERS
GRAPHS
STEADY-STATE POWER DERATING
TEC
TA
Temperature (oC)
FIGURE 1
Power Derating Curve Where TEC is End Cap Temp
and TA is Ambient Temperature on FR4 PC board.
PACKAGE DIMENSIONS
FIGURE 2
INCHES
DIM MIN
MAX
A 0. 094 0.105
B 0. 189 0.205
C 0.016 0.022
MILLIMETERS
MIN MAX
2.39 2.66
4.80 5.20
0.41 0.55
PAD LAYOUT
INCHES
mm
A .276
7.00
B 0.070
1.8
C 0.110
2.8
Copyright © 2005
10-18-2005 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