1N4728A thru 1N4751A
Document Number: 1N4728A thru 1N4751A www.smsemi.com
Feb.29, 2012 1
Maximum Ratings and Electrical Characteristics @ 25OC unless otherwise specified
Symbol
Conditions
Value
Unit
PM(AV)
Steady state power at TL≤ 95℃ 0.375”(10mm) from body
1.0
W
Steady state power at TA≤ 35℃ when mounted on FR4 PC described for
thermal resistance (also see Fig.1)
1.0
W
VF
Maximum instantaneous forward voltage at 200mA
1.2
V
RθJL
Thermal resistance junction to lead
80
℃/W
RθJA
Thermal resistance junction to ambient
140
℃/W
TJ, TSTG
Operating and Storage Temperature
-65 to +175
℃
Transient Voltage Suppressor
Breakdown Voltage 3.3 to 30 Volts
Features
Extensive Voltages selection from 3.3 to 30V
Silicon 1.0 Watt Zener Diodes
Hermetically sealed glass body construction
Application
Voltage stabilization
Regulates voltage over a broad operating current
and temperature range
Flexible axial-lead mounting terminals
Mechanical Data
Case: Void-free transfer molded thermosetting epoxy
body meeting UL94V-O
Terminals: Tin-Lead or ROHS Compliant annealed
matte-Tin plating readily solderable per MIL-STD-750,
Method 2026
Marking: Part number
Polarity: Cathode indicated by band
Weight: 0.3g（Approximately）
CASE: DO-204AL (DO-41)
Dimensions in inches and (millimeters)
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1N4728A thru 1N4751A
Document Number: 1N4728A thru 1N4751A www.smsemi.com
Feb.29, 2012 2
Electrical Characteristics @ 25°C (Unless Otherwise Noted)
Note:
1. The JEDEC type numbers shown with an A suffix 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 that 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.
3. The reverse surge current is measured at 25°C ambient using a 1/2 square wave or equivalent sine wave pulse 1/120 second
duration superimposed on IZT.
4. Zener voltage (VZ) is measured at TL=25°C (+8,-2°C ) and 90 seconds after application of dc current.
JEDEC
Type
Number
(Note1)
Zener
Voltage
VZ @
IZT
(Note4)
Test
Current
Maximum
Dynamic
Impedance
(Note2)
ZZT @ IZT
Maximum
Knee
Impedance
ZZk @ IZk
Maximum
Regulator
Current
TA=50°C
Knee
Current
Maximum
Reverse
Current
IR @ VR
Maximum
Surge
Current
(Note3)
VZ
(V)
IZT
(mA)
ZZT
(Ohms)
ZZK
(Ohms)
IZM
(mA)
IZK
(mA)
IR
(µA)
VR
(V)
Izsm
(mA)
1N4728A
1N4729A
1N4730A
1N4731A
3.3
3.6
3.9
4.3
76.0
69.0
64.0
58.0
10.0
10.0
9.0
9.0
400
400
400
400
276
252
234
217
1.00
1.00
1.00
1.00
100
100
50
10
1.0
1.0
1.0
1.0
1380
1260
1190
1070
1N4732A
1N4733A
1N4734A
1N4735A
4.7
5.1
5.6
6.2
53.0
49.0
45.0
41.0
8.0
7.0
5.0
2.0
500
550
600
700
193
178
162
146
1.00
1.00
1.00
1.00
10
10
10
10
1.0
1.0
2.0
3.0
970
890
810
730
1N4736A
1N4737A
1N4738A
1N4739A
6.8
7.5
8.2
9.1
37.0
34.0
31.0
28.0
3.5
4.0
4.5
5.0
700
700
700
700
133
121
110
100
1.00
0.50
0.50
0.50
10
10
10
10
4.0
5.0
6.0
7.0
660
605
550
500
1N4740A
1N4741A
1N4742A
1N4743A
10.0
11.0
12.0
13.0
25.0
23.0
21.0
19.0
7.0
8.0
9.0
10.0
700
700
700
700
91
83
76
69
0.25
0.25
0.25
0.25
10
5
5
5
7.6
8.4
9.1
9.9
454
414
380
344
1N4744A
1N4745A
1N4746A
1N4747A
15.0
16.0
18.0
20.0
17.0
15.5
14.0
12.5
14.0
16.0
20.0
22.0
700
700
750
750
61
57
50
45
0.25
0.25
0.25
0.25
5
5
5
5
11.4
12.2
13.7
15.2
304
285
250
225
1N4748A
1N4749A
1N4750A
1N4751A
22.0
24.0
27.0
30.0
11.5
10.5
9.5
8.5
23.0
25.0
35.0
40.0
750
750
750
1000
41
38
34
30
0.25
0.25
0.25
0.25
5
5
5
5
16.7
18.2
20.6
22.8
205
190
170
150
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1N4728A thru 1N4751A
Document Number: 1N4728A thru 1N4751A www.smsemi.com
Feb.29, 2012 3
Characteristic Curve
Fig.1 Power Derating Curve
Fig.2 Capacitance vs. Voltage for
Representative Types
0.1 1.0 10 100
VR – Reverse Voltage (V)
1.00
0.75
0.50
0.25
0
Rated Power Dissipation (W)
TL
TA
104
103
102
10
C J– Junction Capacitance (pF)
0 50 100 150 200
Lead or Ambient Temperature (℃)
Fig.3 Temp Coefficient vs. Zener Voltage
0 25 50 75 100
Nominal Zener Voltage (V)
100
75
50
25
0
Temperature Coefficient mV/℃
1N4730A (3.9V)
1N4734A (5.6V)
1N4742A (12V)
1N4746A (18V)
1N4751A (30V)
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