V18ZT1P Littelfuse Inc, V18ZT1P Datasheet - Page 5

• Manufacturer Part Number: V18ZT1P
• Description: VARISTOR 18V .8J 7MM CRIMPED T/R
• Manufacturer: Littelfuse Inc
• Series: ZTr

Specifications of V18ZT1P

• Varistor Voltage: 21.6V
• Current-surge: 250A
• Number Of Circuits: 1
• Maximum Ac Volts: 10VAC
• Maximum Dc Volts: 14VDC
• Energy: 0.80J
• Package / Case: Disc 7mm
• Suppressor Type: Transient Voltage
• Peak Surge Current @ 8/20µs: 250A
• Varistor Case: 7mm DISC
• Clamping Voltage Vc Max: 36V
• Peak Energy (10/1000us): 0.8J
• Voltage Rating Vdc: 14V
• Product: MOV
• Voltage Rating Dc: 14 V
• Voltage Rating Ac: 10 V
• Clamping Voltage: 36 V
• Peak Surge Current: 250 A
• Capacitance: 2000 pF
• Operating Temperature Range: - 55 C to + 85 C
• Mounting: Radial
• Dimensions: 5 mm H
• Termination Style: Radial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Varistor Products
Low to Medum Voltage, Radial Lead
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation
required is simply the energy (watt-seconds) per pulse times the number
of pulses per second. The power so developed must be within the
specifications shown on the Device Ratings and Specifications table for
the specific device. Furthermore, the operating values need to be derated
at high temperatures as shown in Figure 1. Because varistors can only
dissipate a relatively small amount of average power they are, therefore,
not suitable for repetitive applications that involve substantial amounts of
average power dissipation.
Transient V-I Characteristics Curves
RoHS
600
500
400
300
200
100
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05(P) - V68ZA05(P)
90
80
70
60
50
40
30
20
10
10
V68ZA05(P)
V56ZA05(P)
V47ZA05(P)
V39ZA05(P)
V33ZA05(P)
V27ZA05(P)
V22ZA05(P)
V18ZA05(P)
V12ZA05(P)
V8ZA05(P)
-3
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
8 TO 68V
T
A
Pb
= -55
10
o
-2
N(DC)
ZA Varistor Series
C TO 85
RATING
O
10
100
o
1
90
50
10
PEAK AMPERES (A)
C
-1
10
0
T
T
1
T
10
2
1
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
10
2
TIME
10
w w w . l i t t e l f u s e . c o m
3
Example: For an 8/20µs Current Waveform:
20µs = T
8µs = T
O
T
T
T = Time From 10% to 90% of Peak
FIGURE 4. CLAMPING VOLTAGE FOR V82ZA05(P) - V33ZA05(P)
1
1
2
2000
1000
100
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
= Virtual Origin of Wave
= Virtual Front time = 1.25 • t
= Virtual Time to Half Value (Impulse Duration)
100
500
200
90
80
70
60
50
40
30
20
10
0.0001
0
-55
1
2
= Virtual Front Time
= Virtual Time to Half Value
50
0.001
CURVE
60
V330ZA05(P)
V270ZA05(P)
V240ZA05(P)
V220ZA05(P)
V205ZA05(P)
V180ZA05(P)
V150ZA05(P)
V120ZA05(P)
AMBIENT TEMPERATURE (
70
0.01
PEAK AMPERES (A)
80
0.1
90
100
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
82 TO 330V
T
1
A
110
= -55
o
o
10
120
C TO 85
C)
N(DC)
130
100
o
RATING
C
140
1000
150
71
2