1N4728A thru 1N4751A
Transient Voltage Suppressor
Breakdown Voltage 3.3 to 30 Volts
CASE: DO-204AL (DO-41)
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
Dimensions in inches and (millimeters)
Maximum Ratings and Electrical Characteristics
@
Symbol
P
M(AV)
V
F
R
θJL
R
θJA
T
J,
T
STG
Conditions
印
打
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）
效
无
25 C unless otherwise specified
O
Value
1.0
1.0
1.2
80
140
-65 to +175
Unit
W
W
V
℃/W
℃/W
℃
Steady state power at T
L
≤ 95℃ 0.375”(10mm) from body
Steady state power at T
A
≤ 35℃ when mounted on FR4 PC described for
thermal resistance (also see Fig.1)
Maximum instantaneous forward voltage at 200mA
Thermal resistance junction to lead
Thermal resistance junction to ambient
Operating and Storage Temperature
Document Number: 1N4728A thru 1N4751A
Feb.29, 2012
www.smsemi.com
1
1N4728A thru 1N4751A
Electrical Characteristics @ 25° (Unless Otherwise Noted)
C
Zener
Voltage
V
Z
@
I
ZT
(Note4)
V
Z
(V)
JEDEC
Type
Number
(Note1)
Test
Current
Maximum
Dynamic
Impedance
(Note2)
Z
ZT
@ I
ZT
Z
ZT
(Ohms)
Maximum
Knee
Impedance
Z
Zk
@ I
Zk
Z
ZK
(Ohms)
Maximum
Regulator
Current
T
A
=50°
C
I
ZM
(mA)
Knee
Current
Maximum
Reverse
Current
I
R
@ V
R
I
R
(µA)
V
R
(V)
Maximum
Surge
Current
(Note3)
Izsm
(mA)
I
ZT
(mA)
I
ZK
(mA)
1N4728A
1N4729A
1N4730A
1N4731A
1N4732A
1N4733A
1N4734A
1N4735A
1N4736A
1N4737A
1N4738A
1N4739A
1N4740A
1N4741A
1N4742A
1N4743A
1N4744A
1N4745A
1N4746A
1N4747A
1N4748A
1N4749A
1N4750A
1N4751A
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 (I
ZT
or I
ZK
) is superimposed on I
ZT
or I
ZK
. 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° ambient using a 1/2 square wave or equivalent sine wave pulse 1/120 second
C
duration superimposed on I
ZT
.
4. Zener voltage (V
Z
) is measured at T
L
=25° (+8,-2° and 90 seconds after application of dc current.
C
C)
印
打
2
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10.0
11.0
12.0
13.0
15.0
16.0
18.0
20.0
22.0
24.0
27.0
30.0
76.0
69.0
64.0
58.0
53.0
49.0
45.0
41.0
37.0
34.0
31.0
28.0
25.0
23.0
21.0
19.0
17.0
15.5
14.0
12.5
11.5
10.5
9.5
8.5
10.0
10.0
9.0
9.0
8.0
7.0
5.0
2.0
3.5
4.0
4.5
5.0
7.0
8.0
9.0
10.0
14.0
16.0
20.0
22.0
23.0
25.0
35.0
40.0
400
400
400
400
500
550
600
700
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
效
无
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276
252
234
217
193
178
162
146
133
121
110
100
91
83
76
69
61
57
50
45
41
38
34
30
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
0.50
0.50
0.50
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
100
100
50
10
10
10
10
10
10
10
10
10
10
5
5
5
5
5
5
5
5
5
5
5
1.0
1.0
1.0
1.0
1.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
7.6
8.4
9.1
9.9
11.4
12.2
13.7
15.2
16.7
18.2
20.6
22.8
1380
1260
1190
1070
970
890
810
730
660
605
550
500
454
414
380
344
304
285
250
225
205
190
170
150
Document Number: 1N4728A thru 1N4751A
Feb.29, 2012
1N4728A thru 1N4751A
Characteristic Curve
1.00
C
J
– Junction Capacitance (pF)
Rated Power Dissipation (W)
10
4
0.75
T
L
10
3
1N4730A (3.9V)
1N4734A (5.6V)
1N4742A (12V)
0.50
T
A
10
2
1N4751A (30V)
1N4746A (18V)
0.25
0
0
50
100
150
Lead or Ambient Temperature (℃)
200
10
Fig.1 Power Derating Curve
100
Temperature Coefficient mV/℃
75
50
25
0
Fig.3 Temp Coefficient vs. Zener Voltage
印
打
0
25
50
Nominal Zener Voltage (V)
75
100
效
无
0.1
1.0
10
VR – Reverse Voltage (V)
100
Fig.2 Capacitance vs. Voltage for
Representative Types
Document Number: 1N4728A thru 1N4751A
Feb.29, 2012
www.smsemi.com
3
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