Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
TMOV®25S Series
RoHS
Description
Features
t RoHS Compliant
and Lead-free
t 1BUFOUFEJOUFHSBUFE
thermal protection device
1BUFOU64
t 8BWFTPMEFSBCMF
t 4UBOEBSE0QFSBUJOH
7PMUBHF3BOHF
$PNQBUJCMFXJUI
Common AC Line
7PMUBHFT7"$
UP7"$
t )JHIQFBLTVSHFDVSSFOU
SBUJOHVQUPL"BU
TJOHMF4JNQVMTF
t 4UBOEBSEMFBEGPSN
BOETQBDJOHPQUJPO
t ¡$UP¡$PQFSBUJOH
UFNQFSBUVSFSBOHF
Agency Approvals
Applications
t 41%1SPEVDUT
t "$1BOFM1SPUFDUJPO.PEVMFT
t "$-JOF1PXFS4VQQMJFT
t 4VSHF1SPUFDUFE4USJQ$POOFDUPST
t "$1PXFS.FUFST
t *OWFSUFST"$%$QPXFSTVQQMJFTFUD
t 6146OJOUFSSVQUJCMF1PXFS4VQQMZ
Agency Agency File Number Status
6-SE&EJUJPO &
*&$$&$$4QFD
2$$
2$"
*&$"OOFY2
&'
*&$
*&$
*&$"OOFY2

TMOV®25S Varistor Series
.FUBM0YJEF7BSJTUPST.07TBSFSBUFEGPSTQFDJmD"$MJOF
PQFSBUJOHWPMUBHFTBOEFYDFFEJOHUIFTFMJNJUTUISPVHIUIF
BQQMJDBUJPOPGBTVTUBJOFEBCOPSNBMPWFSWPMUBHFDPOEJUJPO
DPVMESFTVMUJOPWFSIFBUJOHBOEEBNBHFUPUIF.07
5IF-JUUFMGVTF5.07®45IFSNBM.074FSJFTXBT
EFTJHOFEUPBEESFTTUIJTDPOEJUJPOJOBTJOHMFJOUFHSBUFE
QBDLBHF
5IF5.07®44FSJFTJODPSQPSBUFTBQBUFOUFEJOUFHSBUFE
UIFSNBMMZSFTQPOTJWFFMFNFOUXJUIJOUIFCPEZPGUIFEFWJDF
XIJDIXJMMPQFODJSDVJUUIFWBSJTUPSJODBTFPGPWFSIFBUJOH
EVFUPUIFBCOPSNBMPWFSWPMUBHFFWFOUT
5IF5.07®44FSJFTJTCBTFEPOUIF-JUUFMGVTF
6MUSB.0744FSJFTXIJDINFFUTUIFTVSHF
TVQQSFTTPSDPNQPOFOUSFDPHOJUJPOSFRVJSFNFOUT
PG6-SEFEJUJPOGPSCPUIDPSEDPOOFDUFEBOE
QFSNBOFOUMZDPOOFDUFE41%FOEQSPEVDUT
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
Absolute Maximum Ratings
t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU
TMOV®25S Series Units
Continous:
"$7PMUBHF3BOHF7."$3.4 UP V
Transient:
Peak Pulse Current (ITM)
'PSYçT$VSSFOU8BWFTJOHMFQVMTF  A
Single-Pulse Energy Capability
'PSNT$VSSFOU8BWF UP J
0QFSBUJOH"NCJFOU5FNQFSBUVSF3BOHF5A UP ¡$
4UPSBHF5FNQFSBUVSF3BOHF5STG UP ¡$
5FNQFSBUVSF$PFGGJDJFOUD7PG$MBNQJOH7PMUBHF7CBU4QFDJGJFE5FTU$VSSFOU  ¡$
)J1PU&ODBQTVMBUJPO$0"5*/(*TPMBUJPO7PMUBHF$BQBCJMJUZ  V
5IFSNBM1SPUFDUJPO*TPMBUJPO7PMUBHF$BQBCJMJUZXIFOPQFSBUFE
4FFOPUFTVOEFS%FWJDF3BUJOHT4QFDJGJDBUJPOTTFDUJPOGPSNPSFJOGPSNBUJPO  V
$0"5*/(*OTVMBUJPO3FTJTUBODF  .æ
Maximum Rating (85°C) Specifications (25 °C)
Continuous Transient
Varistor Voltage at
1mA Test Current
Clamping
Voltage at
100A Current
8/20s
Typical
Capacitance
(f=1MHz)
AC
Volts
DC
Volts
Energy
2ms
Peak
Current
8/20s
Part
Number Branding Model Size Disc
Diameter (mm)
V."$3.SV.%$ W5. I5. 1 × Pulse V/%$ Min V/%$
Max VCC
(V) (V) (J) (A) (V) (V) (pF)
5.0741. 15.
       
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
       
5.0741. 15.
        
5.0741. 15.
       
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
5.0741. 15.
        
Device Ratings & Specifications
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or
any other conditions above those indicated in the operational sections of this specification is not implied.
/PUFT
"WFSBHFQPXFSEJTTJQBUJPOPGUSBOTJFOUTTIPVMEOPUFYDFFEXBUUT
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
TMOV®25S Series
5ZQJDBMUJNFUPPQFODJSDVJUVOEFS6-"COPSNBM
0WFSWPMUBHF-JNJUFE$VSSFOU5FTU
Thermal Characteristics
0.1
1
10
10 100 1000 10000
Current (A)
10 A
5 A
2.5 A
0.5 A
Time (secs)
Typical
0
20
40
60
80
100
-55 506070
80
90 100 110 120 130
AMBIENT TEMPERATURE (ºC)
PERCENT OF RATED VALUE
Current, Energy, Power Derating Curve
100
1000
10000
10µA 100µA 1mA 10mA 100mA 1A 10A 100A 1000A 10000A 100000A
Peak Current
Maximum Peak Voltage (V)
750
625
550
510
460
440
385420
115130
140 150175230 250
275300
320
Transient V–I Characteristic Curves
'PSBQQMJDBUJPOTFYDFFEJOH$BNCJFOUUFNQFSBUVSFUIF
QFBLTVSHFDVSSFOUBOEFOFSHZSBUJOHTNVTUCFSFEVDFE
BTTIPXOCFMPX
Figure 1 Figure 2
Figure 3
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
Pulse Rating Curve
Wave Solder Profile
#FDBVTFUIF5.07®44FSJFTDPOUBJOTBUIFSNBMMZ
SFTQPOTJWFEFWJDFDBSFNVTUCFUBLFOXIFOTPMEFSJOH
UIFEFWJDFJOUPQMBDF5XPTPMEFSJOHNFUIPETBSFQPTTJCMF
'JSTUMZIBOETPMEFSJOH8FSFDPNNFOEUIFVTFPGQMJFST
UPIFBUTJOLUIFMFBETPGUIFEFWJDF4FDPOEMZXBWF
TPMEFSJOH5IJTJTBTUSFOVPVTQSPDFTTSFRVJSJOHQSFIFBU
TUBHFTUPSFEVDFUIFTUSFTTFTPOEFWJDFT
*UJTDSJUJDBMMZJNQPSUBOUUIBUBMMQSFIFBUTUBHFBOEUIF
TPMEFSCBUIUFNQFSBUVSFTBSFSJHJEMZDPOUSPMMFE5IF
SFDPNNFOEFETPMEFSGPSUIF5.07®4FSJFTJTB
4O1C"H4O1CPS4O1C-JUUFMGVTFBMTP
SFDPNNFOETBO3."TPMEFSnVY4"$TPMEFST4O"H$V
BSFSFDPNNFOEFEGPS-FBEGSFFBQQMJDBUJPOT
Soldering Profile
0
50
100
150
200
250
300
0.0 0.51.0 1.52.0 2.53.0 3.54.0
TIME (MINUTES)
MAXIMUM WAVE 260ºC
PREHEAT
TEMPERATURE (ºC)
1
2
∞
15
102
103
1
10
100
1000
10000
100000
10 100 1000 10000
Impulse Duration (μsecs)
104
105
106
Surge Current (A)
Number of Pulses
Figure 4
Figure 5
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
TMOV®25S Series
Application Example
5IFBQQMJDBUJPOFYBNQMFMFGUTIPXTIPXUIFJOEJDBUPS
MFBEPOUIF5.07®DBOCFVTFEUPJOEJDBUFUIBUUIFSNBM
FMFNFOUIBTCFFOPQFOFE5IJTTJHOJmFTUIBUUIFDJSDVJUJT
OPMPOHFSQSPUFDUFEGSPNUSBOTJFOUTCZUIF.07
Line
Line Fuse
Diode
LED
R
Neutral 
TO PROTECTED CIRCUIT
Monitor
Lead
3
2
1
1
2
3
Monitor
Lead
Operating/Storage
Temperature ¡$UP¡$
Passive Aging ¡$IPVST
UZQJDBMWPMUBHFDIBOHF
Humidity Aging ¡$3)IPVST
UZQJDBMWPMUBHFDIBOHF
Thermal Shock ¡$UP¡$UJNFT
UZQJDBMWPMUBHFDIBOHF
Solvent Resistance .*-45%.FUIPE'
Moisture Sensitivity -FWFM+45%$
Lead Material 5JOoDPBUFE$PQQFSXJSF
Soldering
Characteristics
4PMEFSBCJMJUZQFS.*-45%
.FUIPE&
Insulating Material $VSFEnBNFSFUBSEBOUFQPYZQPMZNFS
NFFUT6-7SFRVJSFNFOUT
Device Labeling .BSLFEXJUI-'WPMUBHF6-MPHPTBOE
date code
Physical Specifications Environmental Specifications
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
Dimensions
1BSU/VNCFS WMIN WMAX EMAX AMAX bMIN bMAX DMAX e1 e2 W1 L
5.0741.   
       .JO
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
5.0741.   
Product Dimensions (mm)
Varistor Products
©2012 Littelfuse, Inc.
Revision: May 1, 2012
TMOV®25S Varistor Series
Radial Lead Varistors > TMOV®25S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
TMOV®25S Series
Rated AC Voltage (VM(AC)RMS) – MCOV
5IJTJTUIFNBYJNVNDPOUJOVPVTTJOVTPJEBM3.4WPMUBHF
UIBUNBZCFBQQMJFE
5IJTWPMUBHFNBZCFBQQMJFEBUBOZ
UFNQFSBUVSFVQUPUIFNBYJNVNPQFSBUJOHUFNQFSBUVSF
PGUIFEFWJDF
Maximum Non-Repetitive Surge Current (ITM)
5IJTJTUIFNBYJNVNQFBLDVSSFOUXIJDINBZCFBQQMJFE
GPSBTJOHMFTJNQVMTFXJUISBUFEMJOFWPMUBHFBMTP
BQQMJFEXJUIPVUDBVTJOHEFWJDFGBJMVSF5IFQVMTFDBO
CFBQQMJFEUPUIFEFWJDFJOFJUIFSQPMBSJUZXJUIUIFTBNF
DPOmEFODFGBDUPS
Nominal Discharge Current (IN)
1FBLWBMVFPGUIFDVSSFOUTFMFDUFECZUIFNBOVGBDUVSFS
UISPVHIUIF41%IBWJOHBDVSSFOUXBWFTIBQFPGT
XIFSFUIF41%SFNBJOTGVODUJPOBMBGUFSTVSHFT
Voltage Protection Rating (VPR)
"SBUJOHTFMFDUFEGSPNBMJTUPGQSFGFSSFEWBMVFTBTHJWFO
JO6-BOEBTTJHOFEUPFBDINPEFPGQSPUFDUJPO5IF
WBMVFPG713JTEFUFSNJOFEBTUIFOFBSFTUIJHIFTUWBMVF
UBLFOGSPN6-UPUIFNFBTVSFEMJNJUJOHWPMUBHF
EFUFSNJOFEEVSJOHUIFUSBOTJFOUWPMUBHFTVSHFTVQQSFTTJPO
UFTUVTJOHUIFDPNCJOBUJPOXBWFHFOFSBUPSBUBTFUUJOHPG
L7L"
UL 1449
"O6OEFSXSJUFST-BCPSBUPSZTUBOEBSEDPWFSJOHUIFTBGFUZ
SFRVJSFNFOUTGPS4VSHF1SPUFDUJWF%FWJDFTJOUFOEFEGPS
QFSNBOFOUMZDPOOFDUFEDPSEDPOOFDUFEBOEEJSFDUQMVHJO
BQQMJDBUJPOT
Limited Current Abnormal Over-voltage Test
"O"$PWFSWPMUBHFDPOEJUJPOBQQMJFEUPB4VSHF1SPUFDUJWF
%FWJDFBDDPSEJOHUP6-4FDUJPO5IFTIPSU
DJSDVJUDVSSFOUJTMJNJUFECZTFSJFTDPOOFDUFESFTJTUPST
UP""""BOE"5IFDPOEJUJPOJT
NBJOUBJOFEGPSIPVSTPSVOUJMUIFEFWJDFVOEFSUFTU
JTEJTDPOOFDUFEGSPNUIF"$TVQQMZPSUIFDVSSFOUPS
UFNQFSBUVSFSFBDIFTFRVJMJCSJVN
Maximum Non-Repetitive Surge Energy (WTM)
5IJTJTUIFNBYJNVNSBUFEUSBOTJFOUFOFSHZXIJDINBZCF
EJTTJQBUFEGPSBTJOHMFDVSSFOUQVMTFBUBTQFDJmFEJNQVMTF
EVSBUJPOXJUIUIFSBUFE3.4WPMUBHFBQQMJFEXJUIPVU
DBVTJOHEFWJDFGBJMVSF
Nominal Voltage (VN(DC))
5IJTJTUIFWPMUBHFBUXIJDIUIFEFWJDFDIBOHFTGSPNUIF
PGGTUBOECZTUBUFUPUIFPODMBNQJOHTUBUFBOEFOUFST
JUTDPOEVDUJPONPEFPGPQFSBUJPO5IFWPMUBHFWBMVFJT
VTVBMMZDIBSBDUFSJTFEBUUIFN"QPJOUBOEIBTBTQFDJmFE
NJOJNVNBOENBYJNVNWPMUBHFSBOHF
Term Definitions
Part Numbering System
TMOV 25SP150M
DEVICE FAMILY
Littelfuse thermally responsive MOV
DISC DIAMETER (mm)
25mm
CERAMIC SHAPE
S: Square
SERIES DESIGNATOR
M: 3–Leaded Part
V
M(AC)RMS
115V TO 750V
P: LEAD-FREE AND RoHS
COMPLIANT OPTION