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
+ –
Z
K
@ V
K
V
L
@ I
L
POV
I
P
& Z
T
@ V
T
V
AK
, ANODE-CATHODE VOLTAGE (VOLTS)
REVERSE FORWARD
I
D
, 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
T
J
= 25
°
C
POV = 100 V
(DATA OBTAINED
FROM PULSE TESTS)
V
AK
, ANODE-CATHODE VOLTAGE (VOLTS)
I
D
, FORWARD DIODE CURRENT (mA)
Diode Current.
Limiting Current: 80% of I
P
minimum used to determine
Limiting voltage, V
L
.
Pinch-off Current: Regulator current at specified Test
Voltage, V
T
.
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, Z
K
.
Limiting Voltage: Measured at I
L
, V
L
, together with Knee
AC Impedance, Z
K
, indicates the Knee characteristics of
the device.
Test Voltage: Voltage at which I
P
and Z
T
are specified.
Knee AC Impedance at Test Voltage: To test for Z
K
, a 90
Hz signal V
K
with RMS value equal to 10% of test voltage,
V
K
, is superimposed on V
K
:
Z
K
= V
K
/i
K
where i
K
is the resultant ac current due to V
K
.
To provide the most constant current from the diode, Z
K
should be as high as possible; therefore, a minimum value
of Z
K
is specified.
AC Impedance at Test Voltage: Specified as a minimum
value. To test for Z
T
, a 90 Hz signal with RMS value equal
to 10% of Test Voltage V
T
, is superimposed on V
T
.
SYMBOLS AND DEFINITIONS
APPLICATION NOTE
As the current available from the diode is temperature dependent,
it is necessary to determine junction temperature, T
J
, under specific
operating conditions to calculate the value of the diode current. The
following procedure is recommended:
Lead Temperature, T
L
, shall be determined from:
T
L
= θ
LA
P
D
+ T
A
where θ
LA
is lead-to-ambient thermal resistance
and P
D
is power dissipation.
θ
LA
is generally 30–40°C/W for the various clips and tie points
in common use, and for printed circuit-board wiring.
Junction Temperature, T
J
, shall be calculated from:
T
J
= T
L
+ θ
JL
P
D
where θ
JL
is taken from Figure 2.
For circuit design limits of V
AK
, limits of P
D
may be estimated and
extremes of T
J
may be computed. Using the information on Figures
4 and 5, changes in current may be found. To improve current
regulation, keep V
AK
low to reduce P
D
and keep the leads short,
especially the cathode lead, to reduce θ
JL
.
Figure 1. Typical Current Regulator
Characteristics
Figure 2. Typical Thermal Resistance
Figure 3. Typical Forward Characteristics
I
D
—
I
L
—
I
P
—
POV —
θ
l
—
V
AK
—
V
K
—
V
L
—
V
T
—
Z
K
—
Z
T
—
