1N4728 thru 1N476

1

3 of 4

MCC

TM

Micro Commercial Components

Figure 3. Effect of Zener Current

on Zener Impedance

Figure 4. Effect of Zener Voltage

on Zener Impedance

1000

500

200

100

50

20

10

5

2

1

0.1

0.2

0.5

1

2

5

10

20

50

100

IZ, ZENER CURRENT (mA)

1000

700

500

200

100

70

50

20

10

7

5

2

1

1

2

100

VZ, ZENER CURRENT (mA)

3

5

7

10

20

30

50

70

TJ = 25°C

iZ(rms) = 0.1 IZ(dc)

f = 60 Hz

6.2 V

27 V

VZ = 2.7 V

47 V

TJ = 25°C

iZ(rms) = 0.1 IZ(dc)

f = 60 Hz

20 mA

5 mA

IZ = 1 mA

Figure 1. Typical Thermal Resistance

versus Lead Length

Figure 2. Effect of Zener Current

175

150

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

1

L, LEAD LENGTH TO HEAT SINK (INCHES)

+6

+4

+2

0

–2

–4

3

4

5

6

7

8

VZ, ZENER VOLTAGE (VOLTS)

VZ @ IZ

TA = 25°C

20 mA

0.01 mA

1 mA

NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS

Figure 5. Maximum Surge Power

100

70

50

30

20

10

7

5

3

2

1

0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

10

20

50

100

200

500

1000

PW, PULSE WIDTH (ms)

This graph represents 90 percentile data points.

For worst case design characteristics, multiply surge power by 2/3.

11 V–100 V NONREPETITIVE

3.3 V–10 V NONREPETITIVE

5% DUTY CYCLE

10% DUTY CYCLE

20% DUTY CYCLE

RECTANGULAR

WAVEFORM

TJ = 25°C PRIOR TO

INITIAL PULSE

Revision:

A

20

11/01/01