V18ZA2P Littelfuse Inc, V18ZA2P Datasheet - Page 5

• Manufacturer Part Number: V18ZA2P
• Description: VARISTOR 18V 1.5J 10MM RADIAL ZA
• Manufacturer: Littelfuse Inc
• Series: ZAr
• Type: MOVr

Specifications of V18ZA2P

• Varistor Voltage: 18V
• Package / Case: Disc 10mm
• Number Of Circuits: 1
• Energy: 1.5J
• Current-surge: 500A
• Maximum Ac Volts: 10Vrms
• Maximum Dc Volts: 14VDC
• Product: MOV
• Voltage Rating Dc: 14 V
• Voltage Rating Ac: 10 V
• Clamping Voltage: 36 V
• Peak Surge Current: 500 A
• Surge Energy Rating: 1.5 J
• Capacitance: 5000 pF
• Operating Temperature Range: - 55 C to + 85 C
• Mounting: Through Hole
• Current Rating: 5 A
• Dimensions: 10 mm Dia. x 5 mm H
• Termination Style: Radial
• Brand/series: ZA Series
• Current, Peak: 500 A
• Electric Strength: 1.50 Joules
• Energy Rating: 1.5 Joules
• Mounting Style: PC Mount
• Package: Leads
• Power Rating: 1.5 Joules (Max.) @ +85 °C
• Resistance, Insulation: 1000 Megohms
• Technology: Metal Oxide
• Temperature, Operating, Maximum: 85 °C
• Temperature, Operating, Minimum: -55 °C
• Terminal Type: Radial Leaded
• Voltage, Ac: 10 VAC
• Voltage, Clamping: 36 V
• Voltage, Dc: 14 VDC
• Voltage, Operating: 14.00 VDC
• Voltage, Varistor: 21.6
• 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
ZA Varistor Series
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
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05 - V68ZA05
600
500
400
300
200
100
90
80
70
60
50
40
30
20
10
10
-3
V68ZA05
V56ZA05
V47ZA05
V39ZA05
V33ZA05
V27ZA05
V22ZA05
V18ZA05
V12ZA05
V8ZA05
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
8 TO 68V
T
A
= -55
10
o
-2
N(DC)
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 - V330ZA05
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)
500
200
100
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
V270ZA05
V240ZA05
V220ZA05
V205ZA05
V180ZA05
V150ZA05
V120ZA05
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
120
10
C)
C TO 85
N(DC)
130
100
o
RATING
C
140
1000
150
71
2