Formosa MS
.
1WATT SURFACE MOUNT ZENER DIODE
FEATURES
LOW COST
SMALL SIZE
SMA
ZS4728A
THRU
ZS4753A
0.185(4.8)
0.173(4.4)
0.012(0.3) Typ.
0.110(2.8)
0.094(2.4)
MECHANICAL DATA
CASE︰SMA
TERMINALS：SOLDERABLE PER MIL-STD -202, METHOD 208
POLARITY：COLOR BAND DENOTES CATHODE
MOUNTING POSITION：ANY
WEIGHT：0.05 GRAMS
0.040(1.0) Typ.
0.165(4.2)
0.150(3.8)
0.067(1.7)
0.060(1.5)
0.040 (1.0) Typ.
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
RATINGS AT 25°C AMBIENT TEMPERATURE UNLESS OTHERWISE SPECIFIED
STORAGE AND OPERATING TEMPERATURE RANGE -55 TO + 150℃
Dimensions in inches and (millimeters)
ELECTRICAL CHARACTERISTICS (TA=25℃ UNLESS OTHERWISE NOTED) VF=1.2V MAX, IF = 200mA FOR ALL TYPES
NOMINAL
MAXIMUM ZENER IMPEDANCE
LEAKAGE CURRENT
TEST
ZENER
JEDEC
MARKING
CURRENT
VOLTAGE
I
R
V
R
Z
ZT
@ I
ZT
Z
ZK
@ I
ZK
I
ZK
I
ZT
TYPE NO
CODE
V
Z
@ I
ZT
OHMS
OHMS
Ma
VOLTS
μA
MAX
Ma
VOLTS
1
100
1
400
10
76
3.3
Z3V3
ZS4728A
1
100
1
400
10
69
3.6
Z3V6
ZS4729A
1
50
1
400
9
64
3.9
Z3V9
ZS4730A
1
10
1
400
9
58
4.3
Z4V3
ZS4731A
1
10
1
500
8
53
4.7
Z4V7
ZS4732A
1
10
1
550
7
49
5.1
Z5V1
ZS4733A
2
10
1
600
5
45
5.6
Z5V6
ZS4734A
3
10
1
700
2
41
6.2
Z6V2
ZS4735A
4
10
1
700
3.5
37
6.8
Z6V8
ZS4736A
5
10
0.5
700
4
34
7.5
Z7V5
ZS4737A
6
10
0.5
700
4.5
31
8.2
Z8V2
ZS4738A
7
10
0.5
700
5
28
9.1
Z9V1
ZS4739A
7.6
10
0.25
700
7
25
10
Z10
ZS4740A
8.4
5
0.25
700
8
23
11
Z11
ZS4741A
9.1
5
0.25
700
9
21
12
Z12
ZS4742A
9.9
5
0.25
700
10
19
13
Z13
ZS4743A
11.4
5
0.25
700
14
17
15
Z15
ZS4744A
12.2
5
0.25
700
16
15.5
16
Z16
ZS4745A
13.7
5
0.25
750
20
14
18
Z18
ZS4746A
15.2
5
0.25
750
22
12.5
20
Z20
ZS4747A
16.7
5
0.25
750
23
11.5
22
Z22
ZS4748A
18.2
5
0.25
750
25
10.5
24
Z24
ZS4749A
20.6
5
0.25
750
35
9.5
27
Z27
ZS4750A
22.8
5
0.25
1000
40
8.5
30
Z30
ZS4751A
25.1
5
0.25
1000
45
7.5
33
Z33
ZS4752A
27.4
5
0.25
1000
50
7.0
36
Z36
ZS4753A
SURGE
CURRENT
@ TA=25℃
I
R
－
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
NOTE︰SUFFIX "A" FOR
±5﹪
RATINGS AND CHARACTERISTIC CURVES ZS4728A THRU ZS4753A
θV
Z
, TEMPERATURE COEFFICIENT
( mV/℃)
θV
Z
, TEMPERATURE COEFFICIENT
( mV/℃)
FIG.1A- Range for Units to 12 Volts
+12
+10
+8
+6
+4
+2
0
-2
-4
2
3
4
5
6
7
8
9
10
11 12
RANGE
V
Z
＠I
ZT
FIG.1B- Range for Units to 12 to 100
100
70
50
30
20
10
7
5
3
2
1
10
20
30
50
70
100
RANGE
V
Z
＠I
ZT
V
Z
, ZENER VOLTAGE (VOLTS)
V
Z
, ZENER VOLTAGE (VOLTS)
Figure 2. Temperature Coefficients (-55℃to+150℃temperature change;90% of the units are in the ranges indicated.)
175
150
θ
JL,
JUMCTION TO LEAD
THERMAL
℃
125
100
75
50
25
0
0
0.1 0.2
0.3 0.4 0.5 0.6 0.7 0.8 0.9
10
L, LEAD LENGTH TO HEAT SINK (INCHES)
Figure 3. Typical Thermal Resistance versus Lead
Z
Z
DYNAMIC IMPEDANCE (OHNS)
1000
700
500
200
100
70
50
20
10
7
5
2
1
1
2
3
5
7
10
20
30
50 70 100
I
z
=1mA
θV
Z
, TEMPERATURE COEFFICIENT
( mV/℃)
+6
+4
+2
0
1mA
V
Z
＠I
Z
T
A
=25℃
20mA
0.01mA
-2
-4
3
4
NOTE:BELOW 3 VOLTS AAND ABOCE 8
VOLTS
CHANGES IN ZENER CURRENT DO NOT
5
6
7
8
V
Z
, ZENER VOLTAGE (VOLTS)
Figure 4. Effect of Zener Current
400
300
200
C, CAPACITANCE (
P
F)
0VBIAS
T
j
=25℃
I
z
(ms)=0.1I
z
(do)
f=60h
z
100
0VBIAS
5mA
50
20
10
8
4
1
2
5
10
20
50
100
20mA
50%OF BREAKDOWNBIAS
V
Z,
ZENER CURRENT (mA)
Figure. 7 - Power Temperature Derating Curve
1.25
P
D
,MAXIMUM DISSIPATION
(WATTS)
1.0
0.75
0.5
0.25
V
Z
, NOMINAL V
Z
(VOLTS)
0
20
40
60
80
100
120 140 160
T
L
, LEAD TEMPERATURE (
O
C)
180 200
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