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Surface Mount Varistors
Multilayer Transient Voltage Suppressor
MLE Varistor Series
The MLE Series family of Transient Voltage Suppression devices are based on the Littelfuse Multilayer fabrication technology. These components are designed to suppress ESD events, including those specified in IEC 610004-2 or other standards used for Electromagnetic Compliance testing. The MLE Series is typically applied to protect integrated circuits and other components at the circuit board level operating at 18VDC, or less. The fabrication method and materials of these devices result in capacitance characteristics suitable for high frequency attenuation/low-pass filter circuit functions, thereby providing suppression and filtering in a single device. The MLE Series is manufactured from semiconducting ceramics and is supplied in a leadless, surface mount package. The MLE Series is compatible with modern reflow and wave soldering procedures. Littelfuse Inc. manufactures other Multilayer Series products. See the ML Series data sheet for higher energy/peak current transient applications. See the AUML Series for automotive applications and the MLN Quad Array. For high speed applications see the MHS series.
3
SURFACE MOUNT VARISTORS
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Features
• Rated for ESD (IEC-61000-4-2) • Characterized for Impedance and Capacitance •-55oC to +125oC Operating Temperature Range • Leadless 0402, 0603, 0805, and 1206 sizes • Operating Voltages up to 18VM(DC) • Multilayer Ceramic Construction Technology
Applications
• Protection of Components and Circuits Sensitive to ESD Transients Occurring on Power Supplies, Control and Signal Lines • Suppression of ESD Events Such as Specified in IEC-61000-4-2 or MIL-STD-883C Method-3015.7, for Electromagnetic Compliance (EMC) • Used in Mobile Communications, Computer/EDP Products, Medical Products, Hand Held/Portable Devices, Industrial Equipment, Including Diagnostic Port Protection and I/O Interfaces
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Surface Mount Varistors
Multilayer Transient Voltage Suppressor
MLE Varistor Series
Absolute Maximum Ratings
For ratings of individual members of a series, see device ratings and specifications table.
Continuous: MLE SERIES Steady State Applied Voltage: DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤18 Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to + 125 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to + 150
UNITS
V C O C
O
Device Ratings and Specifications
MAX CONTINUOUS WORKING VOLTAGE -55oC TO 125oC (NOTE 1) VM(DC) PART NUMBER PERFORMANCE SPECIFICATIONS (25 oC) NOMINAL VOLTAGE VNOM AT 1mA DC MAX (V) 28
MAXIMUM CLAMPING VOLTAGE AT SPECIFIED CURRENT (8/20µS) MAXIMUM ESD CLAMP VOLTAGE (NOTE 2)
Vc
(NOTE 3) 8kV CONTACT Clamp (V) <125
(NOTE 4) 15kV AIR Clamp (V) <160
TYPICAL CAPACITANCE AT 1MHz
MAXIMUM LEAKAGE I L MAX AT APPLIED VOLTAGE
(V) 18
MIN (V) 22
(V) 50 at 10A
( pF) <40
( µA) 0.1 0.3 2 10
V DC 3.5 5.5 15 18 3.5 5.5 15 18 3.5 5.5 15 18 3.5 5.5 15 18 3.5 5.5 15 18 3.5 5.5 15 18
NEW
V18MLE0402
V18MLE0603
18
22
28
50 at 10A
<75
<85
<100
0.1 0.3 5.0 25
V18MLE0603L
18
22
28
50 at 10A
<100
<140
<60
0.1 0.3 5.0 25
V18MLE0805
18
22
28
50 at 10A
<70
<75
<500
0.2 0.5 5.0 25
V18MLE0805L
18
22
28
50 at 10A
<75
<135
<100
0.2 0.5 5.0 25
V18MLE1206
18
22
28
50 at 10A
<65
<65
<1700
0.5 1.0 5.0 25
NOTES: 1. For applications of 18VDC or less. Higher voltages available, contact your Littelfuse Sales Representative. 2. Tested with IEC-61000-4-2 Human Body Model (HBM) discharge test circuit. 3. Direct discharge to device terminals (IEC preferred test method). 4. Corona discharge through air (represents actual ESD event). 5. Capacitance may be customized, contact your Littelfuse Sales Representative.
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Surface Mount Varistors
Multilayer Transient Voltage Suppressor
MLE Varistor Series
Typical Performance Curves
For applications exceeding 1250C ambient temperature, the peak surge current and energy ratings must be reduced as shown in Figure 1.
30 NOMINAL VOLTAGE AT 1mADC 100 PERCENT OF RATED VALUE 25 20
80
60
3
10 5 0
40
20
0 -55
50
60
70
80
90
100
110 120
130 140 150
1
10
100 CURRENT (A)
1000
10000
AMBIENT TEMPERATURE ( oC)
FIGURE 1. PEAK CURRENT AND ENERGY DERATING CURVE
FIGURE 2. NOMINAL VOLTAGE STABILITY TO MULTIPLE ESD IMPULSES (8KV CONTACT DISCHARGES PER IEC 61000-4-2)
30 25 VARISTOR VOLTAGE (V) 20 15 10 5 10 0.0001 0.001 0.01 0.1 1 NUMBER OF PULSES 125O 25O
100
-0402 10 -0603 -0805 IMPEDANCE (Z) 1 -1206
85O
0.1
FIGURE 3. STANDBY .