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Technical content

Features

t "&$2DPNQMJBOU t 3P)4$PNQMJBOU t -PBE%VNQFOFSHZ rated per SAE Specification J1113 t -FBEMFTT TVSGBDF mount chip form t i;FSPw-FBE Inductance t 7BSJFUZPGFOFSHZ ratings available t /PUFNQFSBUVSF derating up to 125ºC ambient t )JHIQFBLTVSHF current capability t -PX1SPmMF DPNQBDU industry standard DIJQTJ[F BOE4J[FT t *OIFSFOUCJEJSFDUJPOBM clamping t /P1MBTUJDPSFQPYZ packaging assures CFUUFSUIBO7 flammability rating Size T able Metric EIA 3225 4532 1812 Absolute Maximum Ratings t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFT TFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU Continuous AUML Series Units Steady State Applied Voltage: %$7PMUBHF3BOHF 7. %$ 18 V Transient: -PBE%VNQ&OFSHZ 8-% 1 .5 to 25 J +VNQ4UBSU$BQBCJMJUZ NJOVUFT 7+6.1 24.5 V 0QFSBUJOH"NCJFOU5FNQFSBUVSF3BOHF 5A -55 to +125 OC 4UPSBHF5FNQFSBUVSF3BOHF 5STG UP OC Temperature Coefficient (D7 PG$MBNQJOH7PMUBHF 7C BU4QFDJGJFE5FTU$VSSFOU %/OC 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.

Applications

events such as &'5 and surge voltage at the circuit board level t &4%QSPUFDUJPOGPS components sensitive UP*&$ .*- 45%$ .FUIPE BOEPUIFS industry specifications (See Also the MLE PS.-/4FSJFT t 1SPWJEFTPOCPBSE transient voltage protection for ICs and transistors t 6TFEUPIFMQBDIJFWF electromagnetic compliance of end products t 3FQMBDFMBSHFSTVSGBDF NPVOU574;FOFSTJO many applications

©2010 Littelfuse, Inc. Revision: September 14, 2010 AUML Varistor Series Surface Mount Multilayer Varistors (MLVs) > AUML Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/AUML.html for current information. AUML Series Speed of Response The clamping action of the AUML suppressor depends on a conduction mechanism similar to that of other TFNJDPOEVDUPSEFWJDFT JF1/+VODUJPOT 5IFBQQBSFOU slow response time often associated with transient WPMUBHFTVQQSFTTPST ;FOFST .07T JTPGUFOEVFUP parasitic inductance in the package and leads of the device and less dependent of the basic material (Silicon, 5IVT UIFTJOHMFNPTUDSJUJDBMFMFNFOUBGGFDUJOHUIF response time of any suppressor is its lead induc-tance. The AUML suppressor is a surface mount device, with no leads or external packaging, and thus, it has virtually zero inductance. The actual response time of a AUML surge suppressor is in the 1 to 5 ns range, more than sufficient for the transients which are likely to be encountered in an automotive environment. Multilayer Internal Construction T emperature Effects In the leakage region of the AUML suppressor, the device DIBSBDUFSJTUJDTBQQSPBDIFTBMJOFBS PINJD SFMBUJPOTIJQ and shows a temperature dependent affect. In this region the suppressor is in a high resistance mode (approaching æ BOEBQQFBSTBTBOFBSPQFODJSDVJU-FBLBHFDVSSFOUT at maximum rated voltage are in the microamp range. 8IFODMBNQJOHUSBOTJFOUTBUIJHIFSDVSSFOUT BUBOEBCPWF UIFN"SBOHF UIF"6.-TVQQSFTTPSBQQSPBDIFT BDIBSBDUFSJTUJD*OUIJTSFHJPOUIFDIBSBDUFSJTUJDT of the AUML are virtually temperature independent. 'JHVSFTIPXTUIFUZQJDBMFGGFDUPGUFNQFSBUVSFPO the V-I characteristics of the AUML suppressor. Load Dump Energy Capability "-PBE%VNQUSBOTJFOUPDDVSTXIFOUIFBMUFSOBUPSMPBEJO the automobile is abruptly reduced. The worst case scenario of this transient occurs when the battery is disconnected while operating at full rated load. There are a number of EJGGFSFOU-PBE%VNQTQFDJmDBUJPOTJOFYJTUFODFJOUIF automotive industry, with the most common one being that recommended by the Society of Automotive Engineers, specification #SAE J1113. Because of the diversity of these -PBE%VNQTQFDJmDBUJPOT-JUUFMGVTFEFmOFTUIF-PBE %VNQFOFSHZDBQBCJMJUZPGUIF"6.-TVQQSFTTPSSBOHFBT that energy dissipated by the device itself, independent PGUIFUFTUDJSDVJUTFUVQ5IFSFTVMUBOU-PBE%VNQFOFSHZ handling capability serves as an excellent figure of merit for UIF"6.-TVQQSFTTPS4UBOEBSE-PBE%VNQTQFDJmDBUJPOT SFRVJSFBEFWJDFDBQBCJMJUZPGQVMTFTBUSBUFEFOFSHZ BDSPTTBUFNQFSBUVSFSBOHFPG$UP $5IJT capability requirement is well within the ratings of all of the "6.-4FSJFT 'JHVSFPOOFYUQBHF 'VSUIFSUFTUJOHPOUIF"6.-4FSJFTIBTDPODFOUSBUFE POFYUFOEJOHUIFOVNCFSPG-PBE%VNQQVMTFT BUSBUFE energy, which are applied to the devices. The reliability information thus generated gives an indication of the inherent capability of these devices. As an example of EFWJDFEVSBCJMJUZUIFTJ[FIBTCFFOTVCKFDUFEUPPWFS QVMTFTBUJUTSBUFEFOFSHZPGKPVMFT + UIFTJ[F IBTCFFOQVMTFEPWFSUJNFTBU+BOETJ[FIBT CFFOQVMTFEBUJUTSBUFEFOFSHZPG+PWFSUJNFT*O all cases there has been little or no change in the device DIBSBDUFSJTUJDT 'JHVSFPOOFYUQBHF The very high energy absorption capability of the AUML suppressor is achieved by means of a highly controlled manufacturing process. This technology ensures that a large volume of suppressor material, with an interdigitated layer construction, is available for energy absorption in an extremely small package. Unlike equivalent rated Silicon TVS diodes, the entire AUML device volume is available to EJTTJQBUFUIF-PBE%VNQFOFSHZ )FODF UIFQFBLUFNQFSBUVSFTHFOFSBUFECZUIF-PBE %VNQUSBOTJFOUBSFTJHOJmDBOUMZMPXFSBOEFWFOMZEJTTJQBUFE UISPVHIPVUUIFDPNQMFUFEFWJDF 'JHVSFCFMPX 5IJT even energy dissipation ensures that there are lower peak UFNQFSBUVSFTHFOFSBUFEBUUIF1/HSBJOCPVOEBSJFTPGUIF AUML suppressor. There are a number of different size devices available in the AUML Series, each one with a load dump energy rating, which is size dependent. Experience has shown that while the effects of a load dump tranient is of real concern, its frequency of occurrence is much less than thoe of low energy inductive spikes. Such low energy inductive spikes may be generated as a result PGNPUPSTTXJUDIJOHPOBOEPGG GSPN&4%PDDVSSBODFT GVTF blowing, etc. It is essential that the suppression technology selected also has the capability to suppress such transients. 5FTUJOHPOUIF7"6.-"IBTTIPXOUIBUBGUFSCFJOH TVCKFDUFEUPBSFQFUJUJWFFOFSHZQVMTFPG+ PWFS UJNFT OPDIBSBDUFSJTUJDDIBOHFTIBWFPDDVSSFE 'JHVSFPO OFYUQBHF Figure 5

©2010 Littelfuse, Inc. Revision: September 14, 2010 AUML Varistor Series Surface Mount Multilayer Varistors (MLVs) > AUML Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/AUML.html for current information. Product Dimensions (mm) Note: Avoid metal runs in this area, parts are not recommended GPSVTFJOBQQMJDBUJPOTVTJOH4JMWFS "H FQPYZQBTUF D E W L SYMBOL

1206 Size 1210 Size 1812 Size 2220 Size

A B C D NBY E L W V 18 AUML A 2220 X X PACKING OPTIONS END TERMINATION OPTION DEVICE SIZELOAD DUMP ENERGY RATING INDICATOR AUTOMOTIVE MULTILAYER DESIGNATOR MAXIMUM DC WORKING VOLTAGE DEVICE FAMILY A: Bulk Pack, 2500 pieces H: 7in (178mm) Diameter Reel* T: 13in (330mm) Diameter Reel* * See quanttities in Packaging table below No Letter: Ag/P t 2220 size only N: Nickel Barrier i.e., 220 mil x 200 mil TVSS Device Part Numbering System Packaging* Device Size Quantity 13” Inch Reel ('T' Option) 7” Inch Reel ('H' Option) Bulk Pack ('A' Option) 1812 1BDLBHJOH *UJTSFDPNNFOEFEUIBUQBSUTCFLFQUJOUIFTFBMFECBHQSPWJEFEBOEUIBUQBSUTCFVTFEBTTPPOBTQPTTJCMFXIFOSFNPWFEGSPNCBHT

©2010 Littelfuse, Inc. Revision: September 14, 2010 AUML Varistor Series Surface Mount Multilayer Varistors (MLVs) > AUML Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/AUML.html for current information. AUML Series Symbol Description Dimensions in Millimeters A0 8JEUIPG$BWJUZ %FQFOEFOUPO$IJQ4J[FUP.JOJNJ[F3PUBUJPO B0 Length of Cavity %FQFOEFOUPO$IJQ4J[FUP.JOJNJ[F3PUBUJPO K0 %FQUIPG$BWJUZ %FQFOEFOUPO$IJQ4J[FUP.JOJNJ[F3PUBUJPO W 8JEUIPG5BQF F %JTUBODF#FUXFFO%SJWF)PMF$FOUFSTBOE$BWJUZ$FOUFST E %JTUBODF#FUXFFO%SJWF)PMF$FOUFSTBOE5BQF&EHF P1 %JTUBODF#FUXFFO$BWJUZ$FOUFS P2 "YJBM%JTUBODF#FUXFFO%SJWF)PMF$FOUFSTBOE$BWJUZ$FOUFST P0 "YJBM%JTUBODF#FUXFFO%SJWF)PMF$FOUFST D0 %SJWF)PMF%JBNFUFS D1 %JBNFUFSPG$BWJUZ1JFSDJOH T1 Embossed Tape Thickness .BY .BY T2 Top Tape Thickness .BY .BY t$POGPSNTUP&*" 3FWJTJPO" t$BOCFTVQQMJFEUP*&$QVCMJDBUJPO /05&%JNFOTJPOTJONJMMJNFUFST Tape 8mm Wide Tape 12mm Wide Tape Chip Size 1812 Standard Packaging Tape and reel is the standard packaging method of the "6.-4FSJFT5IFTUBOEBSENJMMJNFUFS oJODI SFFM VUJMJ[FEDPOUBJOTQJFDFTGPSUIFBOEDIJQT QJFDFTGPSUIFDIJQBOE QJFDFTGPSUIF TJ[F To order: add hTh to the standard part number, e.g.V18AUMLA222OT . Special Packaging Option1: NJMMJNFUFS oJODI SFFMTDPOUBJOJOH QJFDFT BSFBWBJMBCMF5PPSEFSBEEh)hUPUIFTUBOEBSE QBSUOVNCFS FH7"6.-") Option 2 'PSTNBMMTBNQMFRVBOUJUJFT MFTTUIBO QJFDFT UIFVOJUTBSFTIJQQFECVMLQBDL5P PSEFSBEEh"hUPUIFstandard part number, e.g. V18AUMLA222 " T ape and Reel Specifications