SMBJ4728 thru SMBJ4751A
Transient Voltage Suppressor
Breakdown Voltage 3.3 to 30 Volts
CASE: SMB (DO214AA)
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
Application
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
Dimensions in inches and (millimeters)
Maximum Ratings and Electrical Characteristics
@
Symbol
P
M(AV)
I
zsm
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:
Body marked with part number
Polarity:
Cathode indicated by band
Weight:
0.093g（Approximately）
效
无
25 C unless otherwise specified
O
Value
2.0
1.25
SEE TABLE1
1.2
35
100
-65 to +150
Unit
W
W
A
V
℃/W
℃/W
℃
Steady state power at T
L
≤ 80℃ 0.375”(10mm) from body
Steady state power at T
A
=25℃ when mounted on FR4 PC described for
thermal resistance (also see Fig.1)
Peak surge current
Maximum instantaneous forward voltage at 200mA
Thermal resistance junction to lead
Thermal resistance junction to ambient
Operating and Storage Temperature
Document Number: SMBJ4728 thru SMBJ4751A
Feb.29, 2012
www.smsemi.com
1
SMBJ4728 thru SMBJ4751A
Electrical Characteristics @ 25° (Unless Otherwise Noted) TABLE1
C
Zener
Voltage
V
Z
@ I
ZT
(Note4)
V
Z
(V)
JEDEC
Type
Number
(Note1)
SMBJ4728A
SMBJ4729A
SMBJ4730A
SMBJ4731A
SMBJ4732A
SMBJ4733A
SMBJ4734A
SMBJ4735A
SMBJ4736A
SMBJ4737A
SMBJ4738A
SMBJ4739A
SMBJ4740A
SMBJ4741A
SMBJ4742A
SMBJ4743A
SMBJ4744A
SMBJ4745A
SMBJ4746A
SMBJ4747A
SMBJ4748A
SMBJ4749A
SMBJ4750A
SMBJ4751A
Test
Current
I
ZT
(mA)
Maximum
Dynamic
Impedance
Z
ZT
@ I
ZT
(Note2)
Z
ZT
(OHMS)
Maximum
Knee
Impedance
Z
Zk
@ I
Zk
(Note2)
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
A
=
50°
C
I
ZM
(mA)
Maximum
Surge
Current
(Note3)
Izsm
(mA)
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 ,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 square wave or equivalent half-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 90seconds 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
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
276
252
234
217
193
178
162
146
133
121
110
100
91
83
76
69
61
57
50
45
41
38
34
30
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: SMBJ4728 thru SMBJ4751A
Feb.29, 2012
SMBJ4728 thru SMBJ4751A
Characteristic Curve
2.0
P
d
, Maximum Power Dissipation (W)
C
J
– Junction Capacitance (pF)
10
4
1.5
T
L
10
3
1N4730A
(3.9V)
1N4734A
(3.9V)
1N4742A
(3.9V)
1.0
10
2
1N4746A
(3.9V)
1N4751A
(3.9V)
0.5
T
A
0
0
50
100
150
Lead or Ambient Temperature (℃)
200
10
Fig.1 Power Derating Curve
100
Temperature Coefficient mv/℃
75
50
25
0
印
打
0
25
50
75
Nominal Zener Voltage (V)
100
效
无
0.1
1.0
10
Reverse Voltage (V)
100
Fig.2 Typical Capacitance vs.
Voltage for Representative Types
Fig.3 Temperature Coefficient vs.
Zener Voltage
Document Number: SMBJ4728 thru SMBJ4751A
Feb.29, 2012
www.smsemi.com
3
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