1N4728A - 1N4761A
1.0W ZENER DIODE
Features
• 1.0 Watt Power Dissipation
• 3.3V - 75V Nominal Zener Voltage
• Standard VZ Tolerance is 5%
• Lead Free Finish, RoHS Compliant (Note 2)
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 Min Max
A 26.0 ⎯
B ⎯ 4.10
C ⎯ 0.86
D ⎯ 2.60
All Dimensions in mm
Maximum Ratings @TA = 25°C unless otherwise specified
Characteristic Symbol Value Unit
Zener Current (see Table page 2) IZ Pd / VZ mA
Power Dissipation
Derate Above 50°C (Note 1) Pd 1.0
6.67 W
mW/°C
Thermal Resistance - Junction to Ambient Air RθJA 175 °C/W
Forward Voltage @ IF = 200 mA VF 1.2 V
Operating and Storage Temperature Range Tj, TSTG -65 to + 175 °C
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 (RοHS) revision 13.2.2003. Glass and high temperature solder exemptions applied where applicable,
see EU Directive Annex Notes 5 and 7.
DS18007 Rev. 18 - 2
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1N4728A - 1N4761A
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DS18007 Rev. 18 - 2
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1N4728A - 1N4761A
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Electrical Characteristics @TA = 25°C unless otherwise specified
Nominal Zener
Voltage (Note 3) Test
Current Maximum Zener Impedance
(Note 4) Maximum Reverse
Leakage Current
Max Surge
Current
8.3ms
VZ @ IZT IZT ZZT @ IZT ZZK @ IZK IZK IR @ VR IZS
Temperature
Coefficient
@ IZT
Type
Number
(V) (mA) (Ω) (Ω) (mA) (µA) (V) (mA) %/°C
1N4728A 3.3 76 10 400 1.0 100 1.0 1380 -0.08 to -0.05
1N4729A 3.6 69 10 400 1.0 100 1.0 1260 -0.08 to -0.05
1N4730A 3.9 64 9.0 400 1.0 50 1.0 1190 -0.07 to -0.02
1N4731A 4.3 58 9.0 400 1.0 10 1.0 1070 -0.07 to -0.01
1N4732A 4.7 53 8.0 500 1.0 10 1.0 970 -0.03 to +0.04
1N4733A 5.1 49 7.0 550 1.0 10 1.0 890 -0.01 to +0.04
1N4734A 5.6 45 5.0 600 1.0 10 2.0 810 0 to +0.045
1N4735A 6.2 41 2.0 700 1.0 10 3.0 730 +0.01 to +0.055
1N4736A 6.8 37 3.5 700 1.0 10 4.0 660 +0.015 to +0.06
1N4737A 7.5 34 4.0 700 0.5 10 5.0 605 +0.02 to +0.065
1N4738A 8.2 31 4.5 700 0.5 10 6.0 550 0.03 to 0.07
1N4739A 9.1 28 5.0 700 0.5 10 7.0 500 0.035 to 0.075
1N4740A 10 25 7.0 700 0.25 10 7.6 454 0.04 to 0.08
1N4741A 11 23 8.0 700 0.25 5.0 8.4 414 0.045 to 0.08
1N4742A 12 21 9.0 700 0.25 5.0 9.1 380 0.045 to 0.085
1N4743A 13 19 10 700 0.25 5.0 9.9 344 0.05 to 0.085
1N4744A 15 17 14 700 0.25 5.0 11.4 304 0.055 to 0.09
1N4745A 16 15.5 16 700 0.25 5.0 12.2 285 0.055 to 0.09
1N4746A 18 14 20 750 0.25 5.0 13.7 250 0.06 to 0.09
1N4747A 20 12.5 22 750 0.25 5.0 15.2 225 0.06 to 0.09
1N4748A 22 11.5 23 750 0.25 5.0 16.7 205 0.06 to 0.095
1N4749A 24 10.5 25 750 0.25 5.0 18.2 190 0.06 to 0.095
1N4750A 27 9.5 35 750 0.25 5.0 20.6 170 0.06 to 0.095
1N4751A 30 8.5 40 1000 0.25 5.0 22.8 150 0.06 to 0.095
1N4752A 33 7.5 45 1000 0.25 5.0 25.1 135 0.06 to 0.095
1N4753A 36 7.0 50 1000 0.25 5.0 27.4 125 0.06 to 0.095
1N4754A 39 6.5 60 1000 0.25 5.0 29.7 115 0.06 to 0.095
1N4755A 43 6.0 70 1500 0.25 5.0 32.7 110 0.06 to 0.095
1N4756A 47 5.5 80 1500 0.25 5.0 35.8 95 0.06 to 0.095
1N4757A 51 5.0 95 1500 0.25 5.0 38.8 90 0.06 to 0.095
1N4758A 56 4.5 110 2000 0.25 5.0 42.6 80 0.06 to 0.095
1N4759A 62 4.0 125 2000 0.25 5.0 47.1 70 0.06 to 0.095
1N4760A 68 3.7 150 2000 0.25 5.0 51.7 65 0.06 to 0.095
1N4761A 75 3.3 175 2000 0.25 5.0 56.0 60 0.06 to 0.095
Notes: 3. Measured under thermal equilibrium and dc (IZT) 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
(IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at two points to insure a sharp knee on the breakdown curve and to
eliminate unstable units.
DS18007 Rev. 18 - 2
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1N4728A - 1N4761A
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0
250
0515 20 25 30
l, L ead Lengt h (mm)
Fig. 2 T ypical Thermal Resistance vs. Lead Length
10
200
50
100
150
R , THERMAL RESISTANCE
JUNCTION TO AMBIENT (°C/W)
θ
JA
0
0.2
0.4
0.6
0.8
1.0
0 40 80 120 160 200
P
,
T
O
T
AL
P
O
WE
R
DISSI
P
A
T
I
O
N
(W)
D
T , AMBIENT TEMPERATURE (°C)
Fig. 1 Power Dissipation vs. Ambient Temperature
A
1
10
100
1,000
110
1
10
100
1,000
0102030405060
C
,
T
O
T
AL
C
A
P
A
C
I
T
AN
C
E (p
F
)
T
V , ZENER VOL TAGE (V)
Fig. 3 Typical Total Capacitance vs. Zener Voltage
Z
100
V , ZENE R VOL TAGE ( V)
Fig. 4 T y pical Zener Impedance vs. Zener V oltage
Z
I = 1mA
Z
2mA
10mA
20mA
5mA
Ordering Information (Notes 5 & 6)
Device Packaging Shipping
(Type Number)-A* DO-41 Glass 5K/Ammo Pack
(Type Number)-T* DO-41 Glass 5K/Tape & Reel
Notes: 5. *Add "-A" or "-T" to the appropriate type number in Electrical Characteristics Table. Example: 6.2V Zener = 1N4735A-A for ammo pack.
6. F or packaging de tails, visit our website at http://www.diodes.com/datasheets/ap02008.pdf
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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.
