1N5283 through 1N5314

Motorola TVS/Zener Device Data

9-4

1.5 Watt DC Power Data Sheet

5

4

3

2

1

0

–20

–40

–60

–80

–100

300

250

200

150

100

50

10

7

5

3

2

1

0.7

0.5

0.3

0.2

0.1

–2

–1

0

20

40

60

80

100

120

140

160

0

0.2

0.4

0.6

0.8

1

0.1

0.2

0.3

0.5

0.7

1

2

3

5

7

10

20

30

50

70

100

REVERSE

FORWARD

ANODE

CATHODE

+

–

ZK @ VK

VL @ IL

POV

IP & ZT @ VT

VAK, ANODE-CATHODE VOLTAGE (VOLTS)

L, LEAD LENGTH (INCHES)

POINT OF LEAD TEMPERATURE

MEASUREMENT

(MOST HEAT CONDUCTION IS

THROUGH THE CATHODE LEAD)

L

L

1N5313

1N5309

1N5305

1N5298

1N5290

TJ = 25°C

POV = 100 V

(DATA OBTAINED

FROM PULSE TESTS)

VAK, ANODE-CATHODE VOLTAGE (VOLTS)

Diode Current.

Limiting Current: 80% of IP minimum used to determine

Limiting voltage, VL.

Pinch-off Current: Regulator current at specified Test

Voltage, VT.

Peak Operating Voltage: Maximum voltage to be applied

to device.

Current Temperature Coefficient.

Anode-to-cathode Voltage.

Knee Impedance Test Voltage: Specified voltage used to

establish Knee Impedance, ZK.

Limiting Voltage: Measured at IL, VL, together with Knee

AC Impedance, ZK, indicates the Knee characteristics of

the device.

Test Voltage: Voltage at which IP and ZT are specified.

Knee AC Impedance at Test Voltage: To test for ZK, a 90

Hz signal VK with RMS value equal to 10% of test voltage,

VK, is superimposed on VK:

ZK = VK/iK

where iK is the resultant ac current due to VK.

To provide the most constant current from the diode, ZK

should be as high as possible; therefore, a minimum value

of ZK is specified.

AC Impedance at Test Voltage: Specified as a minimum

value. To test for ZT, a 90 Hz signal with RMS value equal

to 10% of Test Voltage VT, is superimposed on VT.

SYMBOLS AND DEFINITIONS

APPLICATION NOTE

As the current available from the diode is temperature dependent,

it is necessary to determine junction temperature, TJ, under specific

operating conditions to calculate the value of the diode current. The

following procedure is recommended:

Lead Temperature, TL, shall be determined from:

TL = θLA PD + TA

where

θLA is lead-to-ambient thermal resistance

and

PD is power dissipation.

θLA is generally 30–40°C/W for the various clips and tie points

in common use, and for printed circuit-board wiring.

Junction Temperature, TJ, shall be calculated from:

TJ = TL + θJL PD

where

θJL is taken from Figure 2.

For circuit design limits of VAK, limits of PD may be estimated and

extremes of TJ may be computed. Using the information on Figures

4 and 5, changes in current may be found. To improve current

regulation, keep VAK low to reduce PD and keep the leads short,

especially the cathode lead, to reduce

θJL.

Figure 1. Typical Current Regulator

Characteristics

Figure 2. Typical Thermal Resistance

Figure 3. Typical Forward Characteristics

ID —

IL —

IP —

POV —

θl —

VAK —

VK —

VL —

VT —

ZK —

ZT —