E-153 View Datasheet(PDF) - SEMITEC Corporation

Part Name

Description

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E-153

SURGE ABSORBERS , SENSORS AND MODULES , THERMISTORS

SEMITEC Corporation 

GASTUBE

ARRESTER

Gas tube arrester(GTA)is a surge absorber

featuring low capacitance and high surge

absorption energy.

lt consists of a sealed tube in which inert

gas is injected and electrodes which are

set at fixed intervals. The simple structure

and the dimensional accuracy offer high

reliability and stabilized characteristics.

Applications

1. Protection for telephone set, facsimile, telex,

telephone system, CATV, computer and peripheral

equipment.

2. Semiconductor circuit protection in equipment

that also uses high voltage such as TV,

oscilloscope, and electron microscope.

3. Automatic control of luminous energy in

stroboscopic tube.

4. Generator of high-voltage for gas igniter.

Voltage-Current Characteristics

The current through the GTA is changed over the

range of values of 10Ϫ18 to 102 amps which is shown

as the figure below and the voltage across the GTA will

also valy.The discharge characteristics are changed to

various mode by the flowing current, and the final

mode of the discharge characteristics is arc discharge .

Non self

sustaining

Townsent

b

c

Glow

f

abnomalous

glow

Maximum Single lmpulse Dischrge Current

This test is to determine the ability o f the GTA t o

conduct a maximum single impulse Discharge

current. The current impulse waveform is 8 / 20␮s.

The maximum single impulse discharge current

is the crest current of the impulse.

Capacitance

The capacitance of the GTA is defined as

capacitance across terminals of the GTA at 1 kHz.

Operating Temperature Range

Ϫ20ЊCϳ65ЊC

DC Holdover Voltage

This values is defined as the maximum DC voltage

across the terminals of the GTA which is expected

to clear and restore its high impedance state within

150 ms or less after the passage of a surge.

loc

Ro

ϩ

1

V

Ϫ

D

R

C

li

D

ϩ

2V

T

Ϫ

a 10Ϫ16A

d

e

10Ϫ4ϳ10Ϫ5A

Current

Arc

g

1A

1. DC constant-voltage regulated power supply

2. lmpulse generator

Ro : DC current adjustment resistor

R : Line mimic resistor 136 Ohms

C : Line mimic capacitor 0.083␮F

D : lnsulation diode

When the applied voltage across the GTA exceeds

the breakdown voltage (sparkover voltage), the

current through the GTA increases rapidly to value

of several amps or greater. The rate of current rise and

level to be reached are limited by the series impedance

of the circuit.The voltage across the GTA at this

time is very low with typical value of 20 to 30 volts.

Electrical Characteristics

AC Discharge Current

The current is the rms value of sinusoidal alternating

current of 50Hz or 60Hz which can flow through the

GTA in accordance with a certain test method without

substantially altering its sparkover voltage. The

usual test consists of specified loads applied for 1

sec at interval of 1 min alternately. ln the test of the

maximum AC discharge current, the GTA is applied

9 cycles of 50Hz AC(180 ms) continuously.

lmpulse Surge Life

The life is defined as the minimum number of surges

of a certain current waveform the GTA can survive

without deterioration of its operating specifications.

lnsulation Resistance

This is defined as the resistance value across the

terminal of GTA at 100VDC for devices over 230VDC

(140VDC for GTA type) breakdown voltage and 50VDC

for devices less than 230VDC(140VDC for GTA type) ratings.

DC Breakdown Voltage

The voltage is the minimum slowly rising DC voltage that

will cause sparkover when applied across the terminal

of the GTA.The GTA shall be placed in darkness for

at least 15 min and tested in this condition using a

ramp voltage waveform with 100V/s to 500V/s.

The GTA shall be tested with a positive and a

negative waveform. The sparkover current for DC

sparkover voltage test shall be within 10 amps.

Impulse Breakdown Voltage

The GTA to be exposed to the test shall be kept in

total darkness before (for at least 15 min) and during

the test. Then, with a ramp voltage with 5kV /␮s

applied to the GTA, the breakdown voltage level is

recorded. ln case of testing with opposite polarity,

using the same GTA, a minimum of 15 min shall

elapse.

Impulse Waveform

lmpulse breakdown voltage is the voltage at which

the GTA fires when the voltage increases at rates

of more than 100V/␮s. This value may not vary even

after the GTA has been stored in the dark for long

period. The value of the impulse breakdown voltage

increases with increasing steepness of the surge

voltage as the figure below.

100

90

50

10

Tf

Tt

Time (␮s)

40

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