an9671

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Specifications	an9671
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10-69 Q.What Information is Contained in the ML or MLE Model Number Sequence? A. Using the V18MLA0805L as an example: V The M

Specifications	an9671
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Content	10-69 Q.What Information is Contained in the ML or MLE Model Number Sequence? A. Using the V18MLA0805L as an example: V The Multilayer maintains the Littelfuse MOV “V” (Varistor) designation for Transient Suppressors. 18 The maximum DC working voltage ML The Multilayer Series A Performance or application designator 0805 The EIA size for length and width. (80mils x 50mils in this case) L Low Capacitance version (reduced layer count version in this case) Q.Will This Part Number Vary When Placing An Order? A. Yes. A sufﬁx is added to identify the desired packaging (bulk or reeled) or end termination options. See the Littelfuse data sheet for instructions. Additionally, a custom part will have an X sufﬁx followed by a unique 4 digit designation. Q.What is the Procedure in Selecting a Multilayer? A. The basic procedure is to: 1.Determine the working voltage of the circuit in which the ML is to be placed and select an ML with equal or greater V (DC) MAX. 2.Determine what transient needs to be suppressed in terms of its type, peak surge current and energy in order to select the appropriate Series and device size. 3.Determine the maximum acceptable clamping voltage (or sensitivity level) of the components to be protected and review the V-I characteristics curves of the particular ML. 4.Other things to consider are the bidirectional clamping and typical capacitance of the ML. Q.Are The Multilayers Subject To Listing By Safety Organizations? A. Since the intended usage is in low voltage applications and not AC line or high voltage circuits, no listings are required. Likewise, since these devices are ceramic and not plastic, ﬂammability ratings are not applicable. Q.What ESD Level is the MLE Rated For? A. The MLE is rated to the highest ESD voltage level categories of the IEC-1000-4-2 (human body model) speciﬁcation. These are the 15kV (air discharge) and the 8kV (direct contact) methods. The IEC speciﬁcation is a test method used to determine a given level of ESD immunity for EMC (Electromagnetic Compatibility) ratings of end products or systems. The MLE Series is used to suppress this ESD transient, thereby allowing products to meet EMC criteria. Q.Why is the MLE Characterized for Impedance? A. While operating in their normal standby mode, the inherent capacitance of all MLs help attenuate unwanted noise signals or harmonic frequencies. The MLE is additionally characterized for impedance since the low voltage circuits to which this Series is intended for use may be particularly sensitive to noise or require ﬁltering of power supply lines, for example. Q.Is Clamping Performance Derated Over Temperature for Multilayers? A. No. Clamping voltage, peak current and energy are not derated over the entire temperature range, -55 o C to 125 o C ambient. Q.Are These Devices Marked or Branded? A. No. At the present time part designation is identiﬁed on packaging/shipping labels, including bar coding, where applicable. Q.Where can Multilayers Typically be Placed in Circuits? A. As a Clamping-Type Suppressor, the Multilayer is usually placed between the circuit point subject to transients and the reference electrical “Ground” or “Common”, as close as practical to the transient source. Board level connections include: •Across Switching Transistors •Across Inductive Loads such as Relays or Solenoids •On Local DC Power Supply Lines, Replacing Zener or Zener/Capacitor Combinations •The Data Lines or Control Lines of ICs to Ground •Across Remote Sensors •On High Side or Low Side Drivers •Bus Transceiver I/O Lines to Ground •Across Laser Diodes •Transistor Base or Gate Terminals to Ground •Op Amp Input or Output Terminals to Ground •On Interface Terminals or Connectors Subject to Human Contact or Conducted Transients Q:What is the Leakage of Each Channel of the MLN Array at 5VDC? A. The Maximum Leakage is less than 6nA for any one channel. Q.Can Transients be Applied to all Four Inputs of the MLN Simultaneously? A. The MLN array device exhibits excellent channel isolation and will suppress simultaneous transients at each terminal within its maximum current and energy ratings. Q.I Have Two Lines to Protect. Can Littelfuse Produce a Dual Version of the MLN Quad Device? A. Yes. Contact the Sales department with your speciﬁc requirements. Additionally, other parameters such as Working Voltage and Capacitance can be custom tailored. Application Note 9671
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