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PDF SA90A Data sheet ( Hoja de datos )

Número de pieza SA90A
Descripción Transient Voltage Suppressor Diodes
Fabricantes Taiwan Semiconductor 
Logotipo Taiwan Semiconductor Logotipo



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SA90A Hoja de datos, Descripción, Manual
SA SERIES
Features
Transient Voltage Suppressor Diodes
Voltage Range
5.0 to 170 Volts
500 Watts Peak Power
1.0 Watt Steady State
DO-15
Plastic package has Underwriters Laboratory Flammability
Classification 94V-0
500W surge capability at 10 X 10us waveform, duty cycle:
0.01%
Excellent clamping capability
Low zener impedance
Fast response time: Typically less than 1.0ps from 0 volts to
VBR for unidirectional and 5.0 ns for bidirectional
Typical IR less than 1μA above 10V
High temperature soldering guaranteed: 260°C / 10 seconds
/ .375”,(9.5mm) lead length / 5lbs.,(2.3kg) tension
Mechanical Data
Case: Molded plastic
Lead: Axial leads, solderable per MIL-STD-
Lead: 202, Method 208
Polarity: Color band denotes cathode except
bipolar
Weight: 0.34 gram
Dimensions in inches and (millimeters)
Maximum Ratings and Electrical Characteristics
Rating at 25°C ambient temperature unless otherwise specified.
Type Number
Peak Power Dissipation at TA=25OC, Tp=1ms
(Note 1)
Symbol
PPK
Value
Minimum 500
Units
Watts
Steady State Power Dissipation at TL=75 °C
Lead Lengths .375”, 9.5mm (Note 2)
PD
1.0 Watts
Peak Forward Surge Current, 8.3 ms Single Half
Sine-wave Superimposed on Rated Load
(JEDEC method) (Note 3)
Maximum Instantaneous Forward Voltage at
35.0A for Unidirectional Only
IFSM
VF
70 Amps
3.5 Volts
Operating and Storage Temperature Range
TJ, TSTG
-55 to + 175
Notes: 1. Non-repetitive Current Pulse Per Fig. 3 and Derated above TA=25OC Per Fig. 2.
°C
Notes: 2. Mounted on Copper Pad Area of 1.6 x 1.6” (40 x 40 mm) Per Fig. 5.
Notes: 3. 8.3ms Single Half Sine-wave or Equivalent Square Wave, Duty Cycle=4 Pulses Per Minutes
Notes: 3. Maximum.
Devices for Bipolar Applications
Notes: 1. For Bidirectional Use C or CA Suffix for Types SA5.0 through Types SA170.
Notes: 2. Electrical Characteristics Apply in Both Directions.
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1 page

SA90A pdf
TVS APPLICATION NOTES:
Transient Voltage Suppressors may be used at various points in a circuit to provide various degrees of
protection. The following is a typical linear power supply with transient voltage suppressor units placed at
different points. All provide protection of the load.
FIGURE 1
Transient Voltage Suppressors 1 provides maximum protection. However, the system will probably require
replacement of the line fuse(F) since it provides a dominant portion of the series impedance when a surge is
encountered.
However, we do not recommend to use the TVS diode here, unless we can know the electric circuit
impedance and the magnitude of surge rushed into the circuit. Otherwise the TVS diode is easy to be
destroyed by voltage surge.
Transient Voltage Suppressor 2 provides execllent protection of circuitry excluding the transformer(T).
However, since the transformer is a large part of the series impedance, the chance of the line fuse opening
during the surge condition is reduced.
Transient Voltage Suppressor 3 provides the load with complete protection. It uses a unidirectional
Transient Voltage Suppressor, which is a cost advantage. The series impedance now includes the line fuse,
transformer, and bridge rectifier(B) so failure of the line fuse is further reduced. If only Transient Voltage
Suppressor 3 is in use, then the bridge rectifier is unprotected and would require a higher voltage and current
rating to prevent failure by transients.
Any combination of these three, or any one of these applications, will prevent damage to the load. This would
require varying trade-offs in power supply protection versus maintenance(changing the time fuse).
An additional method is to utilize the Transient Voltage Suppressor units as a controlled avalanche bridge.
This reduces the parts count and incorporates the protection within the bridge rectifier.
FIGURE 2
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