SMAJ4728A thru SMAJ4751A
Transient Voltage Suppressor
Breakdown Voltage 3.3 to 30 Volts
CASE: SMA (DO214AC)
Features
Extensive Voltages selection from 3.3 to 30V
Silicon 2.0 Watt Zener Diodes
Ideal for high-density and low-profile mounting
Regulates voltage over a broad operating current and
temperature range
Flexible axial-lead mounting terminals
High specified maximum current(IZM) when
adequately heat sinking
Application
Dimensions in inches and (millimeters)
Maximum Ratings and Electrical Characteristics
@
Symbol
P
M(AV)
I
zsm
V
F
R
θJL
T
J,
T
STG
Conditions
Steady state maximum power dissipation
Peak surge current
印
打
Use in sensitive electronics protection against voltage
transients induced by inductive load switching and
lighting on IC
S
, MOSFE, signal lines of sensor units
for consumer, computer, industrial, automotive and
telecommunication
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:
Body marked with part number
Polarity:
Cathode indicated by band
Weight:
0.3g（Approximately）
效
无
25 C unless otherwise specified
O
Value
2.0
SEE TABLE1
1.2
25
-65 to +150
Unit
W
A
V
℃/W
℃
Maximum instantaneous forward voltage at 200mA
Thermal resistance junction to lead
Operating and Storage Temperature
Document Number: SMAJ4728A thru SMAJ4751A
Feb.29, 2012
www.smsemi.com
1
SMAJ4728A thru SMAJ4751A
Electrical Characteristics @ 25° (Unless Otherwise Noted) TABLE1
C
Maximum
Dynamic
Impedance
Z
ZT
@ I
ZT
Z
ZT
(OHMS)
Part
Number
Zener
Voltage
V
Z
@ I
ZT
V
Z
(V)
Test
Current
I
ZT
(mA)
Maximum
Knee
Impedance
Z
Zk
@ I
Zk
Z
ZK
(OHMS)
Knee
Current
I
ZK
(mA)
Maximum
Reverse
Current
I
R
@ V
R
I
R
(µA)
V
R
(V)
Maximum
Regulator
Current
T
L
=
100°
C
I
ZM
(mA)
Maximum
Surge
Current
Izsm
(mA)
SMAJ4728A
SMAJ4729A
SMAJ4730A
SMAJ4731A
SMAJ4732A
SMAJ4733A
SMAJ4734A
SMAJ4735A
SMAJ4736A
SMAJ4737A
SMAJ4738A
SMAJ4739A
SMAJ4740A
SMAJ4741A
SMAJ4742A
SMAJ4743A
SMAJ4744A
SMAJ4745A
SMAJ4746A
SMAJ4747A
SMAJ4748A
SMAJ4749A
SMAJ4750A
SMAJ4751A
Note:
1. The 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 ,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 two points to insure 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. Voltage at thermal equilibrium or 90seconds after application of dc current.
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
720
750
750
1000
效
无
www.smsemi.com
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
552
504
468
434
386
356
324
292
266
242
220
200
182
166
152
138
132
114
100
90
82
76
68
60
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: SMAJ4728A thru SMAJ4751A
Feb.29, 2012
stm32/stm8
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