Varistor Products
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High Reliability Varistors
High Reliability Varistors
ZA Series
Agency Approvals
• DSSC Approved
• QPL Listed
• CECC Certified
DA Series
DB Series
• ISO Approved
• UL Recognized
• CSA Certified
MIL
QP
Description
Littelfuse High Reliability Varistors offer the latest in
increased product performance, and are available for
applications requiring quality and reliability assurance levels
consistent with military or other standards (MIL-STD-19500,
MIL-STD-750, Method 202). Additionally, Littelfuse
Varistors are inherently radiation hardened compared
to Silicon Diode suppressors as illustrated in Figure 1.
Littelfuse High-Reliability Varistors involve five categories:
1 DSSC Qualified Parts List (QPL) MIL-R-83530
(4 items presently available)
2 Littelfuse High Reliability Series TX Equivalents
(29 items presently available)
3 Custom Types
Processed to customer-specific requirements
- (SCD) or to Standard Military Flow
4 Commercial Item Descriptors (CID)
identified for Government use:
CID AA-55564-3 - Littelfuse ZA Series
CID AA-55564-2 - Littelfuse DA, DB Series
High Reliability
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
for current information.
201
Revised: May 8, 2013
High Reliability Varistors
Varistor Products
High Reliability Varistors
1) DSSC Qualified Parts List (QPL) MIL-R-83530
This series of varistors are screened and conditioned in accordance with MIL-R-83530 as outlined in Table 2.
Manufacturing system conforms to MIL-I-45208; MIL-Q-9858.
Table 1. MIL-R-83530/1 Ratings and Characteristics
Part
Number
M83530/
1-2000B 200 -/+10 130 175 50 325 3800 570 6000 V130LA20B
1-2200D 220 +10, -5 150 200 55 360 3200 650 6000 V150LA20B
1-4300E 430 +5, -10 275 369 100 680 1800 1200 6000 V275LA40B
1-5100E 510 +5, -10 320 420 120 810 1500 1450 6000 V320LA40B
Nominal
Varistor
Voltage
(V)
Tolerance
(%)
Voltage Rating
(V) Energy
(RMS) (DC)
Rating
(J)
Clamping
Voltage
at 100A
(V)
Capacitance
at 1MHz (pF)
Table 2. Mil-R-83530 Group A, B, and C Inspections
AQL
(Percent
Defective)
Major Minor
Group A
Group B
Group C
Inspection
SUBGROUP 1
High Temperature Life (Stabilization Bake) 100% - - - -
Thermal Shock 100% - - - -
Power Burn-In 100% - - - -
Clamping Voltage 100% - - - -
Nominal Varistor Voltage 100% - - - -
SUBGROUP 2
Visual and Mechanical Examination - 1.0% AQL 7.6% LQ 25% AQL 13.0% LQ Per Plan -
Body Dimensions - Per Plan -
Diameter and Length of Leads - Per Plan -
Marking - Per Plan -
Workmanship - Per Plan -
SUBGROUP 3
Solderability - - - Per Plan -
SUBGROUP 1
Dielectric Withstanding Voltage - - - Per Plan -
SUBGROUP 2
Resistance to Solvents - - - Per Plan -
SUBGROUP 3
Terminal Strength (Lead Fatigue) - - - Per Plan -
Moisture Resistance - - - Per Plan -
Peak Current - - - Per Plan -
Energy - - - Per Plan -
EVERY 3 MONTHS
High Temperature Storage - - - 10 0
Operating Life (Steady State) - - - 10 0
Pulse Life - - - 10 0
Shock - - - 10 0
Vibration - - - 10 0
Constant Acceleration - - - 10 0
Energy - - - 10 0
Clamping
Voltage
At Peak
Current
Rating (V)
ITM (A)
Number
of Sample
Units
Nearest
Commercial
Equivalent
Failures
Allowed
High Reliability Varistors
202
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
for current information.
Varistor Products
High Reliability Varistors
2) Littelfuse High Reliability Series TX Equivalents
TABLE 5. Available TX Model Types
TX Model Model Size
V8ZTX1
V8ZTX2
V12ZTX1
V12ZTX2
V22ZTX1
V22ZTX3
V24ZTX50 20mm 24TX50 V24ZA50
V33ZTX1
V33ZTX5
V33ZTX70
V68ZTX2
V68ZTX10
V82ZTX2
V82ZTX12
7mm
10mm
7mm
10mm
7mm
14mm
7mm
14mm
20mm
7mm
14mm
7mm
14mm
Device
Mark
8TX1
8TX2
12TX1
12TX2
22TX1
22TX3
33TX1
33TX5
33TX70
68TX2
68TX10
82TX2
82TX12
(See Section
4) Nearest
Commercial
Equivalent
V8ZA1
V8ZA2
V12ZA1
V12ZA2
V22ZA1
V22ZA3
V33ZA1
V33ZA5
V33ZA70
V68ZA2
V68ZA10
V82ZA2
V82ZA12
TX Model Model Size
V130LTX2
V130LTX10A
V130LTX20B
V150LTX2
V150LTX10A
V150LTX20B
V250LTX4
V250LTX20A
V250LTX40B
V420LTX20A
V420LTX40B
V480LTX40A
V480LTX80B
V510LTX40A
V510LTX80B
7mm
14mm
20mm
7mm
14mm
20mm
7mm
14mm
20mm
14mm
20mm
14mm
20mm
14mm
20mm
Device
Mark
130TX
130TX10
130TX20
150TX
150TX10
150TX20
250TX
250TX20
250TX40
420TX20
420TX40
480TX40
480TX80
510TX40
510TX80
(See Section
4) Nearest
Commercial
Equivalent
V130LA2
V130LA10A
V130LA20A
V150LA2
V150LA10A
V150LA20B
V250LA4
V250LA20A
V250LA40B
V420LA20A
V420LA40B
V480LA40A
V480LA80B
V510LA40A
V510LA80B
The TX Series of varistors are 100% screened and conditioned in accordance with MIL-STD-750.Tests are as outlined in Table 6.
INSPECTION LOTS
FORMED AFTER
ASSEMBLY
LOTS PROPOSED
>
FOR TX TYPES
100% SCREENING
>
REVIEW OF DATA
TX PREPARA TION
>
FOR DELIVERY
QA ACCEPTANCE
>
SAMPLE PER
APPLICABLE DEVICE
SPECIFICATION
TABLE 6. TX Equivalents Series 100% Screening
Electrical (Bidirectional)
V
, VC (Per Specifications Table)
N(DC)
Dielectric Withstand Voltage
MIL–STD–202, Method 301, 2500V Min. at 1.0μA
Solderability
MIL–STD–202, Method 208, No Aging, Non-Activated
DC
MIL-STD-105
LEVEL AQL
II 0.1 -
--15
--15
LTPD
TABLE 7. Quality Assurance Acceptance Test
Screen
High Temperature Life
(Stabilization Bake)
Thermal Shock
(Temperature Cycling) 1051
Humidity Life 85°C, 85% RH, 168 Hrs. 100%
Interim Electrical V
(Note 3)
Power Burn-In 1038 Condition B, 85°C, rated V
Final Electrical +V
(Note 3)
External Visual
Examination
N(DC) VC
N(DC) VC
MIL-STD-750
Method
1032 24 hours min at max rated storage temperature. 100%
No dwell is required at 25°C. Test condition A1, 5 cycles -55°C to +125°C
(extremes) >10 minutes.
As specified, but including delta parameter as a minimum. 100% Screen
As specified - All parameter measurements must be completed within 96
hours after removal from burn-in conditions.
2071 To be performed after complete marking. 100%
Condition TX Requirements
, 72 hours min. 100%
M(AC)
100%
100% Screen
High Reliability
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
for current information.
203
Revised: May 8, 2013
High Reliability Varistors
Varistor Products
High Reliability Varistors
3) Custom Types
In addition to our comprehensive high-reliability series, Littelfuse can screen and condition to specific requirements.
Additional mechanical and environmental capabilities are defined in Table 8.
TABLE 8. Mechanical And Environmental Capabilities (Typical Conditions)
Test Name Test Method Description
Terminal Strength MIL-STD-750-2036 3 Bends, 90° Arc, 16oz. Weight
Drop Shock MIL-STD-750-2016 1500g’s, 0.5ms, 5 Pulses, X1, V1, Z
Variable Frequency Vibration MIL-STD-750-2056 20g’s, 100-2000Hz, X1, V1, Z
Constant Acceleration MIL-STD-750-2006 V2, 20,000g’s Min
Salt Atmosphere MIL-STD-750-1041 35°C, 24Hr, 10-50g/m2 Day
Soldering Heat/Solderability MIL-STD-750-2031/2026 260°C, 10s, 3 Cycles, Test Marking
Resistance to Solvents MIL–STD–202-215 Permanence, 3 Solvents
Flammability MIL–STD–202-111 15s Torching, 10s to Flameout
Flammability UL1414 3 μ; 15s Torching
Cyclical Moisture Resistance MIL–STD–202-106 10 Days
Steady-State Moisture Resistance MIL–STD–750-1021.3 85/85 96Hr
Biased Moisture Resistance MIL–STD–750-1021.3 Not Recommended for High-Voltage Types
Temperature Cycle MIL–STD–202-107 -55°C to 125°C, 5 Cycles
High-Temperature Life (Nonoperating) MIL-STD-750-1032 125°C, 24Hr
Burn-In MIL-STD-750-1038 Rated Temperature and V
RMS
Hermetic Seal MIL-STD-750-1071 Condition D
1
1
High Reliability Varistors
204
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
for current information.
Varistor Products
High Reliability Varistors
4) Commercial Items
The General Services Administration has authorized the
use of the Commercial Item Description (CID) for all
government agencies. There are three (3) listed series
within Littelfuse leaded/Industrial range:
A-A-55564-3 (ZA Series)
A-A-55564-2 (DA/DB Series)
The PIN number should be used to buy commercial product
to the CID. The manufacturer’s number shown should not
be used for ordering purposes.
PIN consists of abbreviated CID number + Applicable Sheet
(2 digits) + Dash number (-3 digits)
Example: AA55564 + 02 + -001 = AA5556402-001
Table 9. ZA Series A-A-55564-3
Dash Number
AA5556403–
001 V22ZA05 022 V47ZA1 043 V120ZA4
002 V22ZA1 023 V47ZA3 044 V120ZA6
003 V22ZA2 024 V47ZA7 045 V150ZA05
004 V22ZA3 025 V56ZA05 046 V150ZA1
005 V24ZA50 026 V56ZA2 047 V150ZA4
006 V27ZA05 027 V56ZA3 048 V150ZA8
007 V27ZA1 028 V56ZA8 049 V180ZA05
008 V27ZA2 029 V68ZA05 050 V180ZA1
009 V27ZA4 030 V68ZA2 051 V180ZA5
010 V27ZA60 031 V68ZA3 052 V180ZA10
011 V33ZA05 032 V68ZA10 053 V8ZA05
012 V33ZA1 033 V82ZA05 054 V8ZA1
013 V33ZA2 034 V82ZA2 055 V8ZA2
014 V33ZA5 035 V82ZA4 056 V12ZA05
015 V33ZA70 036 V82ZA12 057 V12ZA1
016 V36ZA80 037 V100ZA05 058 V12ZA2
017 V39ZA05 038 V100ZA3 059 V18ZA05
018 V39ZA1 039 V100ZA4 060 V18ZA1
019 V39ZA3 040 V100ZA15 061 V18ZA2
020 V39ZA6 041 V120ZA05 062 V18ZA3
021 V47ZA05 042 V120ZA1 063 V18ZA40
Equiv. Littelfuse
Commercial Part
Dash Number
AA5556403–
Equiv. Littelfuse
Commerical Part
Dash Number
AA5556403–
Equiv.littelfuse
Commercial Part
MFR’s Cage
S6019
Table 10. DA/DB Series A-A-55564-2
Dash Number
AA5556402–
001
002 V151DA40 013 V151DB40
003 V251DA40 014 V251DB40
004 V271DA40 015 V271DB40
005 V321DA40 016 V321DB40
006 V421DA40 017 V421DB40
007 V481DA40 018 V481DB40
008 V511DA40 019 V511DB40
009 V571DA40 020 V571DB40
010 V661DA40 021 V661DB40
011 V751DA40 022 V751DB40
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
for current information.
MFR’s Cage
S6019
Equiv. Littelfuse
Commercial Part
V131DA40 012
205
Revised: May 8, 2013
Dash Number
AA5556402–
MFR’s Cage
S6019
Equiv. Littelfuse
Commercial Part
V131DB40
High Reliability
High Reliability Varistors
Radiation Hardness
Varistor Products
High Reliability Varistors
For space applications, an extremely important property of a
protection device is its response to imposed radiation effects.
Electron Irradiation
A Littelfuse MOV and a Silicon transient suppression diode
were exposed to electron irradiation. The V-I curves, before
and after test, are shown below.
Counterclockwise rotation of the V-I characteristics is
observed in Silicon devices at high neutron irradiation
levels; in other words, increasing leakage at low current
levels and increasing clamping voltage at higher current
levels.
The solid and open circles for a given fluence represent the
high and low breakdown currents for the sample of devices
tested. Note that there is a marked decrease in current (or
200
V
100
80
60
40
20
8
10
It is
FIGURE 1. RADIATION SENSITIVITY OF LITTELFUSE V130LA1
6
10
AND SILICON TRANSIENT SUPPRESSION DIODE
10
CURRENT (A)
LITTELFUSE MOV
SILICON
TRANSIENT
SUPPRESSION
DIODE
PRE TEST
8
RADS,
10
18MeV ELECTRONS
4
2
10
energy) handling capability with increased neutron fluence.
Failure threshold of Silicon semiconductor junctions is
further reduced when high or rapidly increasing currents
are applied. Junctions develop hot spots, which enlarge
until a short occurs if current is not limited or quickly
removed.
The characteristic voltage current relationship of a P– N
Junction is shown below.
SATURATION
CURRENT
BREAKDOWN
VO LTAGE
apparent that the Littelfuse MOV was virtually unaffected,
even at the extremely high dose of 108 rads, while the
Silicon transient suppression diode showed a dramatic
increase in leakage current.
Neutron Effects
A second MOV-Zener comparison was made in response to
neutron fluence. The selected devices were equal in area.
Figure 2 shows the clamping voltage response of the MOV
and the Zener to neutron irradiation to as high as 1015 N/
REDUCTION IN
FAILURE STRESSHOLD
BY RADIAL
SECONDARY
BREAKDOWN
REVERSE
BIAS
cm2. It is apparent that in contrast to the large change in
the Zener, the MOV is unaltered. At highercurrents where
the MOV’s clamping voltage is again unchanged, the Zener
device clamping voltage increases by as much as 36%.
300
VARISTOR V130A2
200
INITIAL AT 10
100
80
60
50
VO LTS
40
30
20
10
FIGURE 2. V-I CHARACTERISTIC RESPONSE TO NEUTRON
1.5K 200
12
AT 1 0
1.5K 200
AT 1 0
10
10
10
IRRADIATION FOR MOV AND ZENER DIODE
DEVICES
15
8
1.5K 200
13
AT 10
10
1.5K 200 INITIAL
1.5K 200
14
AT 1 0
7
6
10
AMPERES
15
5
10
10410
3
FIGURE 3. V-I CHARACTERISTIC OF PN-JUNCTION
At low reverse voltage, the device will conduct very little
current (the saturation current). At higher reverse voltage
VBO (breakdown voltage),the current increases rapidly as
the electrons are either pulled by the electric field (Zener
effect) or knocked out by other electrons (avalanching). A
further increase in voltage causes the device to exhibit a
negative resistance characteristic leading to secondary
breakdown.
This manifests itself through the formation of hotspots,
and irreversible damage occurs. This failure threshold
decreases under neutron irradiation for Zeners, but not for
O Varistors.
Z
N
Gamma Radiation
Radiation damage studies were performed on type
V130LA2 varistors. Emission spectra and V-I characteristics
were collected before and after irradiation with 106 rads
Co60 gamma radiation. Both show no change, within
experimental error, after irradiation.
I
FORWARD
BIAS
V
High Reliability Varistors
206
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/za hirel.html or /db hirel.html
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
for current information.
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