PART OBSOLETE – NO ALTERNATE
PART
1N4728A - 1N4761A
1.0W ZENER DIODE
Features
1.0 Watt Power Dissipation
3.3V - 75V Nominal Zener Voltage
Standard V
Z
Tolerance is 5%
Lead Free Finish, RoHS Compliant (Note 2)
OBSOLETE – PART DISCONTINUED
Mechanical Data
Case: DO-41
Case Material: Glass. UL Flammability
Classification Rating 94V-0
Terminals: Finish
Sn96.5Ag3.5. Solderable
per MIL-STD-202, Method 208
Polarity: Cathode Band
Marking: Type Number
Weight: 0.35 grams (approximate)
DO-41 Glass
Dim
A
B
C
D
Min
26.0
Max
4.10
0.86
2.60
All Dimensions in mm
Maximum Ratings
@T
A
= 25°C unless otherwise specified
Symbol
I
Z
P
d
R
JA
V
F
T
j
, T
STG
Value
Pd / V
Z
1.0
6.67
175
1.2
-65 to + 175
Unit
mA
W
mW/°C
°C/W
V
°C
Characteristic
Zener Current (see Table page 2)
Power Dissipation
Derate Above 50°C (Note 1)
Thermal Resistance - Junction to Ambient Air
Forward Voltage @ I
F
= 200 mA
Operating and Storage Temperature Range
Notes:
1. Valid provided that leads are kept at TL @ 50°C with lead length = 9.5mm (3/8”) from case.
2. EC Directive 2002/95/EC (RHS) revision 13.2.2003. Glass and high temperature solder exemptions applied where applicable,
see
EU Directive Annex Notes 5 and 7.
DS18007 Rev. 20 - 4
1 of 3
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1N4728A - 1N4761A
© Diodes Incorporated
PART OBSOLETE – NO ALTERNATE
PART
Electrical Characteristics
Type
Number
Nominal Zener
Voltage (Note 3)
V
Z
@ I
ZT
(V)
1N4728A
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
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
Test
Current
I
ZT
(mA)
76
69
64
58
53
49
45
41
37
34
31
28
25
23
21
19
17
15.5
14
12.5
11.5
10.5
9.5
8.5
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.7
3.3
@T
A
= 25°C unless otherwise specified
Maximum Zener Impedance
(Note 4)
Z
ZT
@ I
ZT
()
10
10
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
14
16
20
22
23
25
35
40
45
50
60
70
80
95
110
125
150
175
Z
ZK
@ I
ZK
()
400
400
400
400
500
550
600
700
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
2000
2000
2000
I
ZK
(mA)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
Maximum Reverse
Leakage Current
I
R
(µA)
100
100
50
10
10
10
10
10
10
10
10
10
10
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
@ V
R
(V)
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
25.1
27.4
29.7
32.7
35.8
38.8
42.6
47.1
51.7
56.0
Max Surge
Current
8.3ms
I
ZS
(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
115
110
95
90
80
70
65
60
Temperature
Coefficient
@ I
ZT
%/°C
-0.08 to -0.05
-0.08 to -0.05
-0.07 to -0.02
-0.07 to -0.01
-0.03 to +0.04
-0.01 to +0.04
0 to +0.045
+0.01 to +0.055
+0.015 to +0.06
+0.02 to +0.065
0.03 to 0.07
0.035 to 0.075
0.04 to 0.08
0.045 to 0.08
0.045 to 0.085
0.05 to 0.085
0.055 to 0.09
0.055 to 0.09
0.06 to 0.09
0.06 to 0.09
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
0.06 to 0.095
OBSOLETE – PART DISCONTINUED
1N4729A
1N4730A
1N4731A
1N4732A
1N4733A
1N4734A
1N4735A
1N4736A
1N4737A
1N4738A
1N4739A
1N4740A
1N4741A
1N4742A
1N4743A
1N4744A
1N4745A
1N4746A
1N4747A
1N4748A
1N4749A
1N4750A
1N4751A
1N4752A
1N4753A
1N4754A
1N4755A
1N4756A
1N4757A
1N4758A
1N4759A
1N4760A
1N4761A
Notes:
3. Measured under thermal equilibrium and dc (I
ZT
) test conditions.
4. 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 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 to
eliminate unstable units.
DS18007 Rev. 20 - 4
2 of 3
www.diodes.com
1N4728A - 1N4761A
© Diodes Incorporated
PART OBSOLETE – NO ALTERNATE
PART
1.0
250
P
D
, TOTAL POWER DISSIPATION (W)
0.6
R
JA
, THERMAL RESISTANCE
JUNCTION TO AMBIENT (°C/W)
0.8
200
150
OBSOLETE – PART DISCONTINUED
0.4
100
0.2
50
0
0
0
40
80
120
160
200
T
A
, AMBIENT TEMPERATURE (°C)
Fig. 1 Power Dissipation vs. Ambient Temperature
0
15
25
30
10
20
l, Lead Length (mm)
Fig. 2 Typical Thermal Resistance vs. Lead Length
5
1,000
1,000
C
T
, TOTAL CAPACITANCE (pF)
I
Z
= 1mA
2mA
100
100
5mA
10mA
20mA
10
10
1
0
20
30
40
50
60
V
Z
, ZENER VOLTAGE (V)
Fig. 3 Typical Total Capacitance vs. Zener Voltage
10
1
1
10
100
V
Z
, ZENER VOLTAGE (V)
Fig. 4 Typical Zener Impedance vs. Zener Voltage
Ordering Information
(Notes 5 & 6)
Device
(Type Number)-A*
(Type Number)-T*
Notes:
Packaging
DO-41 Glass
DO-41 Glass
Shipping
5K/Ammo Pack
5K/Tape & Reel
5. *Add "-A" or "-T" to the appropriate type number in Electrical Characteristics Table. Example: 6.2V Zener = 1N4735A-A for ammo pack.
6. For packaging details, visit our website at http://www.diodes.com/datasheets/ap02008.pdf
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product
described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall
assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website,
harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written
approval of the President of Diodes Incorporated.
DS18007 Rev. 20 - 4
3 of 3
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1N4728A - 1N4761A
© Diodes Incorporated
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