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 @ ILPOV
IP & ZT @ VT
VAK, ANODE-CATHODE VOLTAGE (VOLTS)
REVERSE FORWARD
ID, DIODE CURRENT (mA)
L, LEAD LENGTH (INCHES)
JL, JUNCTION-TO-LEAD THERMAL RESISTANCE ( C/W)
°θ
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)
ID, FORWARD DIODE CURRENT (mA)
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 V AK, 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 —