# TVS Varistor, 18 V, AUML Series, 40 V, 1812 [4532 Metric], Multilayer Varistor (MLV)

![Product image](https://novapart.co/image/farnell:3604241RL/)

**URL**: https://novapart.co/products/V18AUMLA1812NH/tvs-varistor-18-v-auml-series-40-1812-4532-metric
**SKU**: V18AUMLA1812NH
**Manufacturer**: LITTELFUSE
**Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Varistors
**Price**: €0.9220
**Stock**: 500+
**Lead Time**: 106 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Product Range | AUML Series |
| Varistor Type | Multilayer Varistor (MLV) |
| Voltage Rating Vac | - |
| Voltage Rating Vdc | 18V |
| Varistor Case Style | 1812 [4532 Metric] |
| Clamping Voltage Vc Max | 40V |
| Peak Energy (10/1000Us) | 6J |
| Operating Temperature Max | 125°C |
| Operating Temperature Min | -40°C |
| Peak Surge Current @ 8/20Μs | - |
| Automotive Qualification Standard | AEC-Q200 |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3604241RL/)

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

~~[1~~ ~~**RoHS**~~ 

## AUML Varistor Series 

## ~~**Description**~~ 

The AUML Series of Multilayer Transient Surge Suppressors was specifically designed to suppress the destructive transient voltages found in an automobile. The most common transient condition results from large inductive energy discharges. The electronic systems in the automobile, e.g. antilock brake systems, direct ignition systems, engine control, airbag control systems, wiper motor controls, etc., are susceptible to damage from these voltage transients and thus require protection. The AUML transient suppressors have temperature independent suppression characteristics affording protection from -55ºC to 125ºC. 

The AUML suppressor is manufactured from semiconducting ceramics which offer rugged protection and excellent transient energy absorption in a small package. The devices are available in ceramic leadless chip form, eliminating lead inductance and assuring fast speed of response to transient surges. These Suppressors require significantly smaller space and land pads than Silicon TVS diodes, offering greater circuit board layout flexibility for the designer. 

|~~**Size Table**~~<br>~~Lo~~|~~**Size Table**~~<br>~~Lo~~|
|---|---|
|Metric|EIA|
|3216|1206|
|3225|1210|
|4532|1812|
|5650|2220|



Also see the Littelfuse ML, MLN and MLE Series of Multilayer Suppressors. 

~~**Applications Features** es~~ )§= ~~ee~~ • Suppression of MLN Series) • AEC - Q200 compliant • High peak surge 

   - AEC - Q200 compliant • High peak surge • RoHS Compliant current capability 

- inductive switching • Provides on-board or other transient transient voltage 

- events such as EFT protection for ICs 

- and surge voltage at and transistors the circuit board level 

      - Load Dump energy • Low Profile, compact rated per SAE industry standard chip Specification J1113 size; (1206, 1210, 1812 and 2220 Sizes) 

      - • Leadless, surface mount chip form • Inherent bidirectional clamping 

   - Used to help achieve electromagnetic compliance of end products 

- ESD protection for electromagnetic 

- components sensitive compliance of 

- to IEC 61000-4-2 end products 

- (Level 4), MIL-STD883C, Method 3015.7, • Replace larger surface and other industry mount TVS Zeners in specifications (See many applications Also the MLE or 

- “Zero” Lead Inductance 

- No Plastic or epoxy 

- • Variety of energy packaging assures 

- ratings available better than 94V-0 

- • No temperature derating flammability rating up to 125ºC ambient 

## ~~**Absolute Maximum Ratings**~~ 

•  For ratings of individual members of a series, see Device Ratings and Specifications chart. 

|Continuous<br>AUML Series<br>Units<br>~~a~~|
|---|
|Steady State Applied Voltage:<br>DC Voltage Range(VM(DC))<br>18,24,48<br>V<br>Transient:<br>~~OO~~|
|Load DumpEnergy,(WLD)<br>1.5 to 25<br>J<br>~~Pd~~|
|JumpStart Capability(5 minutes),(VJUMP)<br>48<br>V<br>OperatingAmbient Temperature Range (TA)<br>-55 to +125<br>OC<br>~~=——~~|
|Storage Temperature Range (TSTG)<br>-55 to +150<br>OC<br>Temperature Coefficient (αV) of ClampingVoltage (VC) at Specified Test Current<br><0.01<br>%/OC<br>~~a~~|



_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._ 

© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

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## ~~**Device Ratings and Specifcations**~~ 

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Maximum Ratings  (125 [ºC] ) Specifications  (25 [ºC] )<br>Maximum  Jump Start  Load Dump  Nominal Varistor Voltage  Maximum  Maximum Clamping<br> Part Number Continuous DC Voltage Voltage (5 Min) (10 Pulses)Energy  DC Test Currentat 10mA  Standby Leakage (at 13V DC) Test Current (8/20Voltage (VC) at µ s)<br>VM(DC) VJUMP WLD VN(DC) Min VN(DC) Max IL VC IP<br>(V) (V) (J) (V) (V) ( µ A) (V) (A)<br>V18AUMLA1206 18 24.5 1.5 23 32 50 40 1.5<br>V18AUMLA1210 18 24.5 3.0 23 32 50 40 1.5<br>V18AUMLA1812 18 24.5 6.0 23 32 100 40 5.0<br>V18AUMLA2220 18 24.5 25 23 32 200 40 10.0<br>V24AUMLA2220 24 24.5 25 32 39 200 60 10.0<br>V48AUMLA2220 48 24.5 25 54.5 66.5 200 105 10.0<br>**----- End of picture text -----**<br>


NOTES:  1.  Average power dissipation of transients not to exceed 0.1W, 0.15W, 0.3W and 1W for model sizes 1206, 1210, 1812 and 2220 respectively. 

2. Load dump :min. time of energy input 40ms, interval 60sec(the load dump time constant Td differs from the time constant of energy input;  load dump rating for ISO 7637-2 pulse 5a, please contact littelfuse. 

3. Thermal shock capability per Mil-Std-750, Method 1051: -55ºC to 125ºC, 5 minutes at 25ºC, 25 Cycles: 15 minutes at each extreme. 

4. For application specific requirements, please contact Littelfuse. 

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Peak Pulse Current Test  Waveform for Clamping Voltage<br>100<br>50<br>0<br>T<br>O1 TIME<br>T1<br>Figure 2 T2<br>01 = Virtual Origin of Wave<br>T  = Time from 10%   to 90% of Peak<br>T1 = Rise Time = 1.25 x T<br>T2 = Decay Time<br>Example  - For an 8/20  µ s Current Waveform:<br>8 µ s = T1 = Rise Time<br>20 µ s = T2 = Decay Time<br>Typical V-I Characteristics of the V18AUMLA2220 at -40ºC,<br>25ºC, 85ºC and 125ºC<br>100<br>10 -40 [o] C<br>25 [o] C<br>85 [o] C<br>125 [o] C<br>1<br>1µA 10µA 100µA 1mA 10mA 100mA 1A 10A 100A 1000A<br>Figure 4 CURRENT<br>PERCENT OF PEAK VALUE<br>VOLTAGE<br>**----- End of picture text -----**<br>


## ~~**Current, Energy and Power Derating Curve**~~ 

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 Characteristics Table for the specific device. Certain parameter ratings must be derated at high temperatures as shown below. 

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100<br>90<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>-55 50 60 70 80 90 100 110 120 130 140 150<br>Figure 1 AMBIENT TEMPERATURE ( [o] C)<br>Maximum Leakage Current/Clamping Voltage Curve for<br>AUML Series at 25ºC<br>MAXIMUM LEAKAGE MAXIMUM CLAMPING VOLTAGE<br>100<br>1210/1206<br>1812<br>2220<br>1210/1206<br>10 1812<br>2220<br>1<br>10µA 100µA 1mA 10mA 100mA 1A 10A 100A<br>Figure 3 CURRENT<br>PERCENT OF RATED VALUE<br>VOLTAGE<br>**----- End of picture text -----**<br>


© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

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## ~~**Temperature Effects**~~ 

In the leakage region of the AUML suppressor, the device characteristics approaches a linear (ohmic) relationship and shows a temperature dependent affect. In this region the suppressor is in a high resistance mode (approaching 10[6] Ω) and appears as a near open-circuit. Leakage currents at maximum rated voltage are in the microamp range. 

When clamping transients at higher currents (at and above the 10mA range), the AUML suppressor approaches a 1-10 characteristic. In  this region the characteristics of the AUML are virtually temperature independent. Figure 3 shows the typical effect of temperature on the V-I characteristics of the AUML suppressor. 

## ~~**Load Dump Energy Capability**~~ 

A Load Dump transient occurs when the alternator load in 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 different Load Dump specifications in existence in the 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 Load Dump specifications Littelfuse defines the Load Dump energy capability of the AUML suppressor range as that energy dissipated by the device itself, independent of the test circuit setup. The resultant Load Dump energy handling capability serves as an excellent figure of merit for the AUML suppressor. Standard Load Dump specifications require a device capability of 10 pulses at rated energy, across a temperature range of -40ºC to +125ºC. This capability requirement is well within the ratings of all of the AUML Series (Figure 6 on next page). 

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 dissipate the Load Dump energy. 

Hence, the peak temperatures generated by the Load Dump transient are significantly lower and evenly dissipated throughout the complete device (Figure 5 below). This even energy dissipation ensures that there are lower peak temperatures generated at the P-N grain boundaries of the AUML suppressor. 

## ~~**Speed of Response**~~ 

The clamping action of the AUML suppressor depends on a conduction mechanism similar to that of other semiconductor devices (i.e. P-N Junctions). The apparent slow response time often associated with transient voltage suppressors (Zeners, MOVs) is often due to parasitic inductance in the package and leads of the device and less dependent of the basic material (Silicon, ZNO). Thus, the single most critical element affecting the 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. 

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Multilayer Internal Construction<br>**----- End of picture text -----**<br>


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**Figure 5 AUML Load Dump Pulsing over a Temperature Range of -55ºC to +125ºC** 

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**----- Start of picture text -----**<br>
V(10mA)<br>35<br>2220 = 25J<br>30 1812 = 6J<br>1210 = 3J<br>25<br>20<br>15<br>10<br>5<br>0<br>0 1 2 3 4 5 6 7 8 9 10 11 12<br>Figure 6 # OF LOAD DUMPS<br>VOLTAGE<br>**----- End of picture text -----**<br>


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. 

© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

## ~~**Explanation of  Terms**~~ 

## **Maximum Continuous DC Working Voltage (V** M*(DC)++ **)** 

This is the maximum continuous DC voltage which may be applied, up to the maximum operating temperature (125ºC), to the ML suppressor. This voltage is used as the reference test point for leakage current and is always less than the breakdown voltage of the device. 

## **Load Dump Energy Rating W** LD+ 

This is the actual energy the part is rated to dissipate under Load Dump conditions (not to be confused with the "source energy" of a Load Dump test specification). 

## **Maximum Clamping Voltage V** C+ 

This is the peak voltage appearing across the suppressor when measured at conditions of specified pulse current and specified waveform (8/20 _µ_ s). It is important to note that the peak current and peak voltage may not necessarily be coincidental in time. 

## **Leakage Current I** L+ 

In the nonconducting mode, the device is at a very high impedance (approaching 10[6] Ω at its rated working voltage) and appears as an almost open circuit in the system. The leakage current drawn at this level is very low (<25 _µ_ A at ambient temperature) and, unlike the Zener diode, the multilayer TVS has the added advantage that, when operated up to its maximum temperature, its leakage current will not increase above 500 _µ_ A. 

## **Nominal Voltage V** NDC++ 

This is the voltage at which the AUML enters its conduction state and begins to suppress transients. In the automotive environment this voltage is defined at the 10mA point and has a minimum 

(VN(DC) MIN) and maximum (VN(DC) MAX) voltage specified. 

## **Additional Information** 

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Datasheet Resources<br>**----- End of picture text -----**<br>


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Samples<br>**----- End of picture text -----**<br>


© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

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## ~~**Lead (Pb) Soldering Recommendations**~~ 

The principal techniques used for the soldering of components in surface mount technology are IR Re-flow and Wave soldering. Typical profiles are shown on the right. 

The termination option available for each solder technique is: 

Reflow                                        Wave 

1. Nickel Barrier (preferred)        1. Nickel Barrier (preferred) 

2. Silver/Platinum 

The recommended solder for the AUML 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. 

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 AUML 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 50ºC before cleaning. 

## ~~**Lead–free (Pb-free) Soldering Recommendations**~~ 

Littelfuse offers the Nickel Barrier Termination finish for the optimum Lead–free solder performance. 

The preferred solder is 96.5/3.0/0.5 (SnAgCu) with an RMA flux, but there is a wide selection of pastes and fluxes available with which the Nickel Barrier parts should be compatible. 

The reflow profile must be constrained by the maximums in the Lead–free Reflow Profile. For Lead–free Wave soldering, the Wave Solder Profile still applies. 

Note: the Lead–free paste, flux and profile were used for evaluation purposes by Littelfuse, based upon industry standards and practices. There are multiple choices of all three available, it is advised that the customer explores the optimum combination for their process as processes vary considerably from site to site. 

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Refow Solder Profle<br>230<br>Figure 9<br>**----- End of picture text -----**<br>


## ~~**Wave Solder Profle**~~ 

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**----- Start of picture text -----**<br>
300<br>MAXIMUM WAVE 260 [o] C<br>250<br>200<br>150<br>SECOND PREHEAT<br>100<br>FIRST PREHEAT<br>50<br>0<br>0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5<br>Figure 10 TIME (MINUTES)<br>Lead–free Re-fow Solder Profle<br>MAXIMUM TEMPERATURE 260˚C<br>20 - 40 SECONDS WITHIN 5˚C<br>RAMP RATE<br><3˚C/s 60 - 150 SEC<br> > 217˚C<br>PREHEAT ZONE<br>5.0          6.0         7.0<br>Figure 11<br>oC)<br>TEMPERATURE (<br>**----- End of picture text -----**<br>


© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

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## ~~**Product Dimensions (mm)**~~ 

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PAD LAyOUT DIMENSIONS<br>**----- End of picture text -----**<br>


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Note: Avoid metal runs in this area, parts are not recommended for use in applications using Silver (Ag) epoxy paste. 

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CHIP LAyOUT DIMENSIONS<br>E<br>L<br>D<br>W<br>**----- End of picture text -----**<br>


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1206 Size 1210 Size 1812 Size 2220 Size<br>SYMBOL<br>IN MM IN MM IN MM IN MM<br>A 0.203 5.150 0.219 5.510 0.272 6.910 0.315 8.000<br>B 0.103 2.620 0.147 3.730 0.172 4.360 0.240 6.190<br>C 0.065 1.650 0.073 1.850 0.073 1.850 0.073 1.850<br>D  (max.) 0.071 1.80 0.070 1.80 0.07 1.80 0.118 3.00<br>0.50  -/+<br>E 0.020 -/+ 0.010 0.50 -/+0.25 0.020 -/+ 0.010 0.50  -/+ 0.25 0.020 -/+ 0.010 0.030 -/+ 0.010 0.75 -/+ 0.25<br>0.25<br>4.50 -/+<br>L 0.125 -/+ 0.012 3.20 -/+ 0.03 0.125 -/+ 0.012 3.20 -/+ 0.30 0.180 -/+ 0.014 0.225 -/+ 0.016 5.70 -/+ 0.40<br>0.35<br>3.20 -/+<br>W 0.060 -/+ 0.011 1.60 -/+ 0.28 0.100 -/+ 0.012 2.54 -/+ 0.30 0.125 -/+ 0.012 0.197 -/+ 0.016 5.00 -/+ 0.40<br>0.30<br>**----- End of picture text -----**<br>


## ~~**Part Numbering System**~~ 

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V 18 AUML A 2220 X X<br>PACKING OPTIONS<br>DEVICE FAMILY<br>A: Bulk Pack, 2500 pieces<br>TVSS Device<br>H: 7in (178mm) Diameter Reel*<br>MAXIMUM DC T: 13in (330mm) Diameter Reel*<br>WORKING VOLTAGE * See quanttities in Packaging table below<br>END TERMINATION OPTION<br>AUTOMOTIVE N or No Letter: Nickel Barrier<br>MULTILAYER DESIGNATOR<br>LOAD DUMP ENERGY RATING<br>DEVICE SIZE<br>INDICATOR<br>i.e., 220 mil x 200 mil<br>**----- End of picture text -----**<br>


## ~~**Packaging***~~ 

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**----- Start of picture text -----**<br>
Quantity<br>Device Size 13” Inch Reel 7” Inch Reel  Bulk Pack<br>('T' Option) ('H' Option) ('A' Option)<br>1206 10,000 2,500 2,500<br>1210 8,000 2,000 2,000<br>1812 4,000 1,000 1,000<br>2220 4,000 1,000 1,000<br>**----- End of picture text -----**<br>


*(Packaging) It is recommended that parts be kept in the sealed bag provided and that parts be used as soon as possible when removed from bags. 

© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 

**Metal-Oxide Varistors** (MOVs) Surface Mount Multilayer Varistors (MLVs)  >  AUML Series 

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## ~~**Tape and Reel Specifcations**~~ 

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**----- Start of picture text -----**<br>
 Symbol Description Dimensions in Millimeters<br>A0 Width of Cavity Dependent on Chip Size to Minimize Rotation.<br>B0 Length of Cavity Dependent on Chip Size to Minimize Rotation.<br>K0 Depth of Cavity Dependent on Chip Size to Minimize Rotation.<br>W Width of Tape 8 -/+ 0.2 12 -/+ 0.2<br>F Distance Between Drive Hole Centers and Cavity Centers 3.5 -/+ 0.5 5.4 -/+ 0.5<br>E Distance Between Drive Hole Centers and Tape Edge 1.75 -/+ 0.1 1.75 -/+ 0.1<br>P1 Distance Between Cavity Center 4 -/+ 0.1 8-/+ 0.1<br>P2 Axial Distance Between Drive Hole Centers and Cavity Centers 2 -/+ 0.1 2 -/+ 0.1<br>P0 Axial Distance Between Drive Hole Centers 8 -/+ 0.1 8 -/+ 0.1<br>D0 Drive Hole Diameter 1.55 -/+ 0.05 1.55 -/+ 0.05<br>D1 Diameter of Cavity Piercing 1.05 -/+ 0.05 1.55 -/+ 0.05<br>T1 Embossed Tape Thickness 0.3 Max 0.4 Max<br>T2 Top Tape Thickness 0.1 Max  0.1 Max<br>**----- End of picture text -----**<br>


NOTE: Dimensions in millimeters. 

- Conforms to EIA-481-1, Revision A 

- Can be supplied to IEC publication 286-3 

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Tape 8mm Wide Tape 12mm Wide Tape<br>Chip Size 1206 1210 1812 2220<br>**----- End of picture text -----**<br>


## ~~**Standard Packaging**~~ 

Tape and reel is the standard packaging method of the AUML Series. The standard 300 millimeter (13–inch) reel utilized contains 4000 pieces for the 2200 and 1812 chips, 8000 pieces for the 1210 chip and 10,000 pieces for the 1206 size. 

To order: add 'T' to the standard part number, e.g.V18AUMLA222OT. 

## ~~**Special Packaging**~~ 

**Option1:** 178 millimeter (7–inch) reels containing 1000 (2220, 1812), 2000 (1210), 2500 (1206), pieces are available. To order add 'H' to the standard part number, e.g. V18AUMLA2220H. 

**Option 2** For small sample quantities (less than 100 pieces) the units are shipped bulk pack. To order add 'A' to the standard part number, e.g. V18AUMLA2220A. 

© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/15 



## Links

- [View this product on Novapart](https://novapart.co/products/V18AUMLA1812NH/tvs-varistor-18-v-auml-series-40-1812-4532-metric)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/littelfuse/v18aumla1812nh/varistor-aec-q200-mov-40v-1812/dp/3604241RL)
---

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