Metal-Oxide Varistors (MOVs)
Surface Mount Multilayer Varistors (MLVs) > MLA Automotive Series
MLA Automotive Varistor Series
RoHS
Description
The MLA Automotive Series of transient voltage surge
suppression devices is based on the Littelfuse Multilayer
fabrication technology. These components are designed
to suppress a variety of transient events, including those
specified in IEC 61000-4-2 or other standards used for
Electromagnetic Compliance (EMC). The MLA Automotive
Series is typically applied to protect integrated circuits and
other components at the circuit board level.
The wide operating voltage and energy range make the
MLA Automotive Series suitable for numerous applications
on power supply, control and signal lines.
The MLA Automotive Series is manufactured from
semiconducting ceramics, and is supplied in a leadless,
surface mount package. The MLA Automtove Series
is compatible with modern reflow and wave soldering
procedures.
Size Table
Metric
EIA
1608
0603
2012
0805
3216
1206
3225
1210
It can operate over a wider temperature range than Zener
diodes, and has a much smaller footprint than plastichoused components.
Features
Absolute Maximum Ratings
• For ratings of individual members of a series, see device ratings and specifications table.
MLA Auto
Series
Continuous
Units
Steady State Applied Voltage:
• Halogen-Free and
RoHS compliant
• Leadless 0603, 0805,
1206 and 1210 chip sizes
DC Voltage Range (VM(DC))
3.5 to 120
V
AC Voltage Range (VM(AC)RMS)
2.5 to 107
V
Non-Repetitive Surge Current, 8/20µs
Waveform, (ITM)
up to 500
A
• -40°C to +125°C
operating temp. range
Non-Repetitive Surge Energy, 10/1000µs
Waveform, (WTM)
0.1 to 2.5
J
• Operating voltage range
VM(DC) = 3.5V to 120V
Operating Ambient Temperature Range (TA)
-40 to +125
ºC
• Rated for surge
current (8 x 20µs)
Storage Temperature Range (TSTG)
-40 to +150
ºC
MLA Automotive Series
Device Ratings and Specifications
Maximum Ratings (125º C)
Part Number
V3.5MLA0603NHAUTO
V3.5MLA0805NHAUTO
V3.5MLA0805LNHAUTO
V3.5MLA1206NHAUTO
V5.5MLA0603NHAUTO
V5.5MLA0805NHAUTO
V5.5MLA0805LNHAUTO
V5.5MLA1206NHAUTO
V9MLA0603NHAUTO
V9MLA0805LNHAUTO
V12MLA0805LNHAUTO
V14MLA0603NHAUTO
V14MLA0805NHAUTO
V14MLA0805LNHAUTO
V14MLA1206NHAUTO
V18MLA0603NHAUTO
V18MLA0805NHAUTO
V18MLA0805LNHAUTO
V18MLA1206NHAUTO
V18MLA1210NHAUTO
V26MLA0603NHAUTO
V26MLA0805NHAUTO
V26MLA0805LNHAUTO
V26MLA1206NHAUTO
V26MLA1210NHAUTO
V30MLA0603NHAUTO
V30MLA0805LNHAUTO
V30MLA0805NHAUTO
V30MLA1210NHAUTO
V30MLA1210LNHAUTO
V33MLA1206NHAUTO
V42MLA1206NHAUTO
V48MLA1210NHAUTO
V48MLA1210LNHAUTO
V48MLA1206NHAUTO
V56MLA1206NHAUTO
V60MLA1210NHAUTO
V68MLA1206NHAUTO
V85MLA1210NHAUTO
V120MLA1210NHAUTO
Maximum
Continuous
Working Voltage
Specifications (25ºC)
Jump
Start
Voltage
(5 min)
Load
Dump
Energy
Maximum Nonrepetitive Surge
Current (8/20µs)
Maximum
Non-repetitive
Surge Energy
(10/1000µs)
Maximum
Clamping
Nominal Voltage
Typical
Voltage at 1A at 1mA DC Test Capacitance at
(or as Noted)
Current
f = 1MHz
(8/20µs)
VM(DC)
VM(AC)
VJUMP
WLD
ITM
WTM
VC
VN(DC) Min
(V)
3.5
3.5
3.5
3.5
5.5
5.5
5.5
5.5
9.0
9.0
12.0
14.0
14.0
14.0
14.0
18.0
18.0
18.0
18.0
18.0
26.0
26.0
26.0
26.0
26.0
30.0
30.0
30.0
30.0
30.0
33.0
42.0
48.0
48.0
48.0
56.0
60.0
68.0
85.0
120.0
(V)
2.5
2.5
2.5
2.5
4.0
4.0
4.0
4.0
6.5
6.5
9.0
10.0
10.0
10.0
10.0
14.0
14.0
14.0
14.0
14.0
20.0
20.0
20.0
20.0
20.0
25.0
25.0
25.0
25.0
25.0
26.0
30.0
40.0
40.0
40.0
40.0
50.0
50.0
67.0
107.0
(V)
---------------24.5
24.5
24.5
24.5
24.5
27.5
27.5
27.5
27.5
27.5
29
29
29
29
29
36
48
48
48
48
48
48
48
48
(J)
---------------0.3
1
0.7
1.5
3
0.4
1
0.7
1.5
3
0.4
0.7
1
3
3
1.5
1.5
3
1.5
1.5
3
1.5
3
3
(A)
30
120
40
100
30
120
40
150
30
40
40
30
120
40
150
30
120
40
150
500
30
100
40
150
300
30
30
80
280
220
180
180
250
220
180
180
250
180
150
125
(J)
0.100
0.300
0.100
0.300
0.100
0.300
0.100
0.400
0.100
0.100
0.100
0.100
0.300
0.100
0.400
0.100
0.300
0.100
0.400
2.500
0.100
0.300
0.100
0.600
1.200
0.100
0.100
0.300
1.200
0.900
0.800
0.800
1.200
0.90
0.90
1.00
1.50
1.00
2.50
2.00
(V)
13.0
13.0
13.0
13.0
17.5
17.5
17.5
17.5
25.5
25.5
29.0
34.5
32.0
32.0
32.0
50.0
44.0
44.0
44.0
44.0 at 2.5
60.0
60.0
60.0
60.0
60.0 at 2.5
74.0
72.0
72.0
68.0 at 2.5
68.0 at 2.5
75.0
92.0
105.0 at 2.5
105.0 at 2.5
100
120.0
130.0 at 2.5
140.0
180.0 at 2.5
260.0 at 2.5
(V)
3.7
3.7
3.7
3.7
7.1
7.1
7.1
7.1
11.0
11.0
14.0
15.9
15.9
15.9
15.9
22.0
22.0
22.0
22.0
22.0
31.0
29.5
29.5
29.5
29.5
37.0
37.0
37.0
35.0
35.0
38.0
46.0
54.5
54.5
54.5
61.0
67.0
76.0
95.0
135.0
VN(DC)
Max
(V)
7.0
7.0
7.0
7.0
9.3
9.3
9.3
9.3
16.0
16.0
18.5
21.5
20.3
20.3
20.3
28.0
28.0
28.0
28.0
28.0
38.0
38.5
38.5
38.5
38.5
46.0
46.0
46.0
43.0
43.0
49.0
60.0
66.5
66.5
66.5
77.0
83.0
90.0
115.0
165.0
C
(pF)
860
1500
1080
3000
830
1200
400
2900
210
400
210
90
560
320
800
120
245
180
1050
2500
50
110
90
600
1260
45
80
100
690
500
380
340
400
320
180
150
230
130
160
80
NOTES:
1. 'L' suffix is a low capacitance and energy version; Contact your Littelfuse sales representative for custom capacitance requirements
2. Typical leakage at 25ºC MLA Automotive Series
Peak Current and Energy Derating Curve
Peak Pulse Current Test Waveform for Clamping Voltage
PERCENT OF RA TED VALUE
100
PERCENT OF PEAK VALUE
When transients occur in rapid succession, the average
power dissipation is 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. For applications exceeding 125°C ambient
temperature, the peak surge current and energy ratings
must be derated as shown below.
50
0
T
O1
100
TIME
T1
Figure 2
80
T2
60
40
20
0
-55
50
Figure 1
60
70
80
90 100 110 120
AMBIENTTEMPERATURE ( oC)
130 140 150
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
2. PEAK PULSE CURRENT TEST WAVEFORM
T1 =FIGURE
Rise Time
= 1.25 x T
FOR CLAMPING VOLTAGE
T2 = Decay Time
Example
- For an 8/20 µs Current Waveform:
O1 = VIRTUAL ORIGIN OF WAVE
8µs
= TFROM
= Rise
t = TIME
10%Time
TO 90% OF PEAK
1
t20µs
FRONT
TIME
= 1.25 x t
1 = VIRTUAL
= T2 =
Decay
Time
t2 = VIRTUAL TIME TO HALF VALUE
(IMPULSE DURA TION)
EXAMPLE:
FOR AN 8/20 s CURRENT WAVEFORM
8 s = t1 = VIRTUAL FRONT TIME
20 s = t2 = VIRTUAL TIME TO
HALF VALUE
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/21/20
Metal-Oxide Varistors (MOVs)
Surface Mount Multilayer Varistors (MLVs) > MLA Automotive Series
Limit V-I Characteristic for V3.5MLA0603NHAUTO to
V30MLA0603NHAUTO
Limit V-I Characteristic for V3.5MLA0805LNHAUTO to
V30MLA0805LNHAUTO
1000
1000
V30MLA0805LNHAUTO
V30MLA0603NHAUTO
V26MLA0805LNHAUTO
V26MLA0603NHAUTO
V18MLA0805LNHAUTO
V18MLA0603NHAUTO
100
100
Varistor Voltage (V)
Varistor Voltage (V)
V14MLA0603NHAUTO
V9MLA0603NHAUTO,
V9MLA0603LNHAUTO
10
V5.5MLA0603NHAUTO,
V5.5MLA0603LNHAUTO
V14MLA0805LNHAUTO
10
V12MLA0805LNHAUTO
V9MLA0805LNHAUTO
V5.5MLA0805LNHAUTO
V3.5MLA0603NHAUTO
1
10µA
100µA
1mA
10mA
Current (A)
Figure 3
100mA
1A
10A
1
10µA
100A
V3.5MLA0805LNHAUTO
100µA
1mA
10mA
FIGURE X. LIMIT V-I CHARACTERISTIC FOR V3.5MLA0603NHAUTO TO V30MLA0603NHAUTO
Limit V-I Characteristic
for V3.5MLA0805NHAUTO to
V26MLA0805NHAUTO
100mA
1A
10A
100A
Current (A)
Figure 4
FIGURE
X. LIMIT
V-I CHARACTERISTIC FOR
TO V30MLA0805LNHAUTO
Limit
V-I
Characteristic
forV3.5MLA0805LNHAUTO
V3.5MLA1206NHAUTO
to
V42MLA1206NHAUTO
1000
1000
V30MLA0805LNHAUTO
V26MLA0805LNHAUTO
V18MLA0805LNHAUTO
V14MLA0805LNHAUTO
100
10
Varistor Voltage (V)
Varistor Voltage (V)
100
V12MLA0805LNHAUTO
V9MLA0805LNHAUTO
V5.5MLA0805LNHAUTO
V48MLA1206NHAUTO
V68MLA1206NHAUTO
V56MLA1206NHAUTO
V42MLA1206NHAUTO
V42MLA1206
V33MLA1206NHAUTO
V33MLA1206
V26MLA1206
V26MLA1206NHAUTO
10
V18MLA1206
V18MLA1206NHAUTO
V14MLA1206
V14MLA1206NHAUTO
V5.5MLA1206
V5.5MLA1206NHAUTO
V3.5MLA1206
V3.5MLA1206NHAUTO
V3.5MLA0805LNHAUTO
1
10µA
100µA
1mA
10mA
100mA
1A
10A
100A
Current (A)
Figure 5
1
10µA
100µA
1mA
10mA
100mA
Current (A)
1A
10A
100A
1000A
Figure 7
FIGURE X. LIMIT V-I CHARACTERISTIC FOR V3.5MLA0805LNHAUTO TO V30MLA0805LNHAUTO
Limit V-I Characteristic for V18MLA1210NHAUTO to
V48MLA1210NHAUTO
FIGURE 6. LIMIT V-1 CHARACTERISTIC FOR V3.5MLA1206 TO V68MLA1206
1000
Varistor Voltage (V)
100
V120MLA1210NHAUTO
V85MLA1210NHAUTO
V60MLA1210NHAUTO
V48MLA1210NHAUTO, V48MLA1210LNHAUTO
V30MLA1210NHAUTO, V30MLA1210LNHAUTO
V26MLA1210NHAUTO
10
V18MLA1210NHAUTO
1
10µA
100µA
1mA
10mA
100mA
1A
10A
100A
1000A
CURRENT (A)
Figure 6
FIGURE
X. LIMIT V-I CHARACTERISTIC FOR V18MLA1210NHAUTO TO V120MLA1210NHAUTO
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/21/20
Metal-Oxide Varistors (MOVs)
Surface Mount Multilayer Varistors (MLVs) > MLA Automotive Series
Clamping Voltage Over Temperature (VC at 10A)
Device Characteristics
At low current levels, the V-I curve of the multilayer
transient voltage suppressor approaches a linear (ohmic)
relationship and shows a temperature dependent effect.
At or below the maximum working voltage, the suppressor
is in a high resistance modex (approaching 106Ω at its
maximum rated working voltage). Leakage currents at
maximum rated voltage are below 100µA, typically 25µA.
CLAMPING VOLTAGE (V)
100
Typical Temperature Dependance of the Haracteristic
Curve in the Leakage Region
V26MLA1206
V5.5MLA1206
10
-60
VNOM VALUE AT 25 oC (%)
SUPPRESSOR VOLTAGE IN PERCENT OF
100%
-40
-20
0
Figure 9
20
40
60
80
TEMPERATURE ( oC)
100
120
140
FIGURE 12. CLAMPING VOLTAGE OVER TEMPERATURE
(VC AT 10A)
Energy Absorption/Peak Current Capability
25
10%
1E -9
o
50o 75o
1E -8
100o 125 oC
1E -7
1E -6
1E -5
1E -4
1E -3
1E -2
SUPPRESSOR CURRENT (ADC)
Figure 8
FIGURE 10. TYPICAL TEMPERATURE DEPENDANCE OF THE CHARACTERISTIC
CURVE IN THE LEAKAGE REGION
Speed of Response
The Multilayer Suppressor is a leadless device. Its
response time is not limited by the parasitic lead
inductances found in other surface mount packages. The
response time of the ZNO dielectric material is less than
1ns and the MLA Automotive Series can clamp very fast
dV/dT events such as ESD. Additionally, in "real world"
applications, the associated circuit wiring is often the
greatest factor effecting speed of response. Therefore,
transient suppressor placement within a circuit can be
considered important in certain instances.
Energy dissipated within the MLA Automotive Series is
calculated by multiplying the clamping voltage, transient
current and transient duration. An important advantage of
the multilayer is its interdigitated electrode construction
within the mass of dielectric material. This results in
excellent current distribution and the peak temperature per
energy absorbed is very low. The matrix of semiconducting
grains combine to absorb and distribute transient energy
(heat) (see Speed of Response). This dramatically reduces
peak temperature; thermal stresses and enhances device
reliability.
As a measure of the device capability in energy and peak
current handling, the V26MLA1206 part was tested with
multiple pulses at its peak current rating (150A, 8/20µs). At
the end of the test,10,000 pulses later, the device voltage
characteristics are still well within specification.
Repetitive Pulse Capability
Multilayer Internal Construction
100
METAL
ELECTR ODES
PEAK CURRENT = 3A
8/20 s DURATION, 30s BETWEEN PULSES
V26MLA1206
VOLTAGE
FIRED CERAMIC
DIELECTRIC
METAL END
TERMINATION
DEPLETION
REGION
10
0
DEPLETION
Figure 11
REGION
Figure 10
2000
4000
6000
8000
10000
12000
NUMBER OF PULSES
FIGURE 13.
REPETITIVE PULSE CAPABILITY
GRAINS
FIGURE 11. MULTILAYER INTERNAL CONSTR UCTION
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/21/20
Metal-Oxide Varistors (MOVs)
Surface Mount Multilayer Varistors (MLVs) > MLA Automotive Series
Lead (Pb) Soldering Recommendations
Wave soldering is the most strenuous of the processes.
To avoid the possibility of generating stresses due to
thermal shock, a preheat stage in the soldering process
is recommended, and the peak temperature of the solder
process should be rigidly controlled.
When using a reflow process, care should be taken
to ensure that the MLA Automotive Series chip is not
subjected to a thermal gradient steeper than 4 degrees
per second; the ideal gradient being 2 degrees per second.
During the soldering process, preheating to within 100
degrees of the solder's peak temperature is essential to
minimize thermal shock.
Once the soldering process has been completed, it is
still necessary to ensure that any further thermal shocks
are avoided. One possible cause of thermal shock is hot
printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room
temperature. The boards must be allowed to cool gradually
to less than 50º C before cleaning.
250
250
TEMPERATURE
°C °C
TEMPERATURE
TEMPERATURE
°C
The recommended solder for the MLA Automotive Series
suppressor is a 62/36/2 (Sn/Pb/Ag), 60/40 (Sn/Pb) or 63/37
(Sn/Pb). Littelfuse also recommends an RMA solder flux.
Reflow Solder Profile
MAXIMUM TEMPERATURE
MAXIMUM230°C
TEMPERATURE
230°C
40-80
MAXIMUM TEMPERATURE
SECONDS
40-80
230°C
ABOVE 183°C
250
200
200
SECONDS
ABOVE 183°C
RAMP RATE40-80
SECONDS
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