Varistor Products
©2012 Littelfuse, Inc.
Revision: April 11, 2012
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
113 UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOVTM 25S Series
ULTRAMOV™ 25S Series
RoHS
Description
Features
t-FBEoGSFFBOE
3P)4DPNQMJBOU
t)JHIQFBLTVSHF
DVSSFOUSBUJOH*TM
L"TJOHMFμT
QVMTFNN
tL"SBUJOHXIFO
EFWJDFTQBSBMMFMFE
7/%$NBUDIFE
XJUIJO
DPOUBDUGBDUPSZGPS
TQFDJBMTFMFDUJPOT
t4UBOEBSEPQFSBUJOH
WPMUBHFSBOHF
DPNQBUJCMFXJUI
DPNNPO"$MJOF
WPMUBHFTUP
7"$
t$IBSBDUFSJ[FEGPS
NBYJNVNTUBOECZ
DVSSFOU-FBLBHF
t$VTUPNWPMUBHF
UZQFTBWBJMBCMF
t4UBOEBSEMFBEGPSN
BOEMFBETQBDFPQUJPOT
Agency Approvals
Absolute Maximum Ratings
t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU
Agency Agency FIle Number Status
& "QQSPWFE
 "QQSPWFE
Continuous UltraMOVTM 25S Series Units
Steady State Applied Voltage:
"$7PMUBHF3BOHF7."$3.4)UP 7
%$7PMUBHF3BOHF7.%$)UP 7
Transients:
1FBL1VMTF$VSSFOU*TMYμT$VSSFOU8BWF4JOHMF1VMTF  "
4JOHMF1VMTF&OFSHZ$BQBCJMJUZ8TMNT$VSSFOU8BWF UP J
0QFSBUJOH"NCJFOU5FNQFSBUVSF3BOHF5")UP $
4UPSBHF5FNQFSBUVSF3BOHF5STG)UP $
5FNQFSBUVSF$PFGmDJFOUB7PG$MBNQJOH7PMUBHF7$BU4QFDJmFE5FTU$VSSFOU  $
)J1PU&ODBQTVMBUJPO$0"5*/(*TPMBUJPO7PMUBHF$BQBCJMJUZ
%JFMFDUJD8JUITUBOE%$GPSNJOQFS.*-o45%o.FUIPE  7
*OTVMBUJPO3FTJTUBODFPGUIF&QPYZ$PBUJOH  MΩ
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is
not implied.
5IF6MUSB.07TM47BSJTUPS4FSJFTJTEFTJHOFEGPS
BQQMJDBUJPOTSFRVJSJOHIJHIQFBLTVSHFDVSSFOUSBUJOHTBOE
IJHIFOFSHZBCTPSQUJPODBQBCJMJUZ6MUSB.07WBSJTUPSTBSF
QSJNBSJMZJOUFOEFEGPSVTFJO"$-JOF7PMUBHFBQQMJDBUJPOT
TVDIBT4VSHF1SPUFDUJWF%FWJDFT41%6OJOUFSSVQUBCMF
1PXFS4VQQMJFT614"$1PXFS5BQT"$1PXFS.FUFST
PSPUIFSQSPEVDUTUIBUSFRVJSFWPMUBHFDMBNQJOHPGIJHI
USBOTJFOUTVSHFDVSSFOUTGSPNTPVSDFTTVDIBTMJHIUOJOH
JOEVDUJWFMPBETXJUDIJOHPSDBQBDJUPSCBOLTXJUDIJOH
5IFTFEFWJDFTIBWFNNTRVBSFGPSNTBSFQSPEVDFE
JOBSBEJBMMFBEQBDLBHFBOEPGGFSFEXJUITUSBJHIUMFBET
6MUSB.07TBSFNBOVGBDUVSFEXJUISFDPHOJ[FEFQPYZ
FODBQTVMBUJPOBOEBSFSBUFEGPSBNCJFOUUFNQFSBUVSFT
VQUP¡$XJUIOPEFSBUJOH5IJT44FSJFTJT
-"4&3CSBOEFEBOEJTTVQQMJFEJOCVMLQBDLBHJOH
UltraMOVTM 25S Varistor Series
Varistor Products
©2012 Littelfuse, Inc.
Revision: April 11, 2012 Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
114
UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOVTM 25S Series
UltraMOV™ 25S Series Ratings & Specifications
Part
Number Branding
Maximum Rating (85°C) Specifications (25°C)
Continuous Transient Varistor Voltage
at 1mA DC
Test Current
Maximum
Clamping
Voltage at 100A,
8 x 20μs
UL 1449 ed.3
Voltage
Protection
Rating
Typical
Capaci-
tance
f = 1MHz
AC Volts DC Volts Energy
2ms
Peak Surge
Current
8 x 20μs
V."$3.4 V.%$
WTM
1 x
Pulse
ITM
1 x Pulse
V/0.
Min
V/0.
Max V$VPR C
(V) (V) (J) (A) (V) (V) (pF)
741 14        
741 14         
741 14         
741 14         
741 14         
741 14         
741 14         
741 14         
741 14         
741 14         
741 14         
741 14        
741 14        OB 
741 14        OB 
741 14        OB 
741 14        OB 
741 14       OB 
741 14        OB 
Note:"WFSBHFQPXEFSEJTTJQBUJPOPGUSBOTJFOUTTIPVMEOPUFYDFFEXBUUT
'PSBQQMJDBUJPOTFYDFFEJOH$BNCJFOUUFNQFSBUVSFUIF
QFBLTVSHFDVSSFOUBOEFOFSHZSBUJOHTNVTUCFSFEVDFEBT
TIPXOBCPWF
Peak Current, Energy and Power Derating Curve
0
20
40
60
80
100
55 50 60 70 80 90 100 110 120 130
PERCENT OF RATED VALUE
AMBIENT TEMPERATURE (ºC)
0
50
100
PERCENT OF PEAK VALUE
TIME
t1t2
t
O1
Peak Pulse Current Test Waveform for Clamping Voltage
Transient V-I Characteristics Curves
7JSUVBM0SJHJOPG8BWF
55JNFGSPNUPPG1FBL
T3JTF5JNFY5
T2%FDBZ5JNF
Example 'PSBOμT$VSSFOU8BWFGPSN
μT53JTF5JNF
μT52%FDBZ5JNF
Figure 1 Figure 2
Varistor Products
©2012 Littelfuse, Inc.
Revision: April 11, 2012
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
115 UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOVTM 25S Series
ULTRAMOV™ 25S Series
100
1000
10000
0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 100000
Maximum Peak Voltage (V)
Peak C urren t (A)
115 130 140 150 175 230 250
275 300
320
385 420 440
460 510 550
625
750
V-I Limit Curves
Pulse Rating Curves
1
10
100
1000
10000
100000
10 100 1000 10000
Peak Current (A)
Impulse Duration (μs)
1
15
102
10
10
3
4
105
106
2
∞
Figure 3
Figure 4
Varistor Products
©2012 Littelfuse, Inc.
Revision: April 11, 2012 Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
116
UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOVTM 25S Series
UltraMOVTM 25S Series Varistors for High-Temperature Operating Conditions:
Wave Solder Profile
Operating/Storage
Temperature
¡$UP¡$
¡$UP¡$
Passive Aging ¡$IPVST
UZQJDBMWPMUBHFDIBOHF
Humidity Aging ¡$3)IPVST
UZQJDBMWPMUBHFDIBOHF
Thermal Shock ¡$UP¡$UJNFT
UZQJDBMWPMUBHFDIBOHF
Solvent Resistance .*-o45%o.FUIPE'
Moisture Sensitivity -FWFM+o45%o$
Lead Material 5JOoDPBUFE$PQQFSXJSF
Soldering
Characteristics
4PMEFSBCJMJUZQFS.*-o45%o
.FUIPE&
Insulating Material $VSFEnBNFSFUBSEBOUFQPYZQPMZNFS
NFFUT6-7oSFRVJSFNFOUT
Device Labeling .BSLFEXJUI-'WPMUBHF6-$4"-PHPT
BOEEBUFDPEF
Physical Specifications Environmental Specifications
0
50
100
150
200
250
300
00.511.522.5 33.54
TIME(MINUTES)
TEMPERATURE
(ºC)
Maximum Wave 240C
Lead–free Wave Solder Profile
0
50
100
150
200
250
300
00.511.522.5 33.54
TIME(MINUTES)
TEMPERATURE
(ºC)
Maximum Wave 260C
Non Lead–free Wave Solder Profile
1IFOPMJDDPBUFEEFWJDFTBSFBWBJMBCMFXJUIJNQSPWFENBYJNVNPQFSBUJOHUFNQFSBUVSF$
5IFTFEFWJDFTBMTPIBWFJNQSPWFEUFNQFSBUVSFDZDMJOHDBQBCJMJUZ3BUJOHTBOETQFDJmDBUJPOT
BSFQFSTUBOEBSETFSJFTFYDFQU)Jo1PU&ODBQTVMBUJPO*TPMBUJPO7PMUBHF$BQBCJMJUZ7
To order:BEEh9hUPQBSUOVNCFSFH74195IFTFEFWJDFTBSF/056-$4"
$&$$PS7%&DFSUJmFE$POUBDUGBDUPSZGPSGVSUIFSEFUBJMT
Figure 5 Figure 6
Varistor Products
©2012 Littelfuse, Inc.
Revision: April 11, 2012
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
117 UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOVTM 25S Series
ULTRAMOV™ 25S Series
Product Dimensions (mm)
E
L A
e1
e
b
D
Notes
A
max
b
min
b
max
D
max
e
min
e
max
e1
min
e1
max
E
max
L
min
741
32.5 0.95 1.05 28 11.7 13.7
  
25.4
741   
741   
741   
741   
741   
741   
741   
741   
741   
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PSEFSSFRVJSFNFOUT1MFBTFDPOUBDUGBDUPSZGPSEFUBJMT
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JTBWBJMBCMFBTBOPQUJPO5IJTJT$PQQFS8JSFXJUIBnBTIJOHPG/JDLFMGPMMPXFECZBUPQDPBUPG5JO5PPSEFSQMFBTF
BEETVGmYh9hUPFOEPGTUBOEBSEQBSUOVNCFS$POUBDUGBDUPSZGPSNPSFEFUBJMTJGSFRVJSFE
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CFUXFFOUIFTFDPOEBSZPGUIFTFSWJDFUSBOTGPSNFSBOEUIFMJOFTJEFPGUIFTFSWJDFFRVJQNFOUPWFSDVSSFOUEFWJDF
BTXFMMBTUIFMPBETJEFJODMVEJOHXBUUIPVSNFUFSTPDLFUFODMPTVSFTBOEJOUFOEFEUPCFJOTUBMMFEXJUIPVUBO
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