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1.5SMC250A Datasheet(PDF) 8 Page - Littelfuse |
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1.5SMC250A Datasheet(HTML) 8 Page - Littelfuse |
8 / 146 page 4 Transient Voltage Suppression Diodes ©2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to http://www.littelfuse.com for current information. 4 Crowbar Device The class of suppressors that exhibit a “crowbar” characteristic is usally associated with 4-layer NPNP silicon bipolar devices or gas plasma/GDT devices. Upon reaching a threshold or breakover voltage, further increase in current flow will cause the device to rapidly conduct with only a few volts of forward drop. In essence, the line is momentarily “short-circuited” during the transient event. Operating Temperature Range The minimum and maximum ambient operating temperature of the circuit in which a device will be applied. Operating temperature does not allow for the effects of adjacent components, this is a parameter the designer must take into consideration. Capacitance The property of a circuit element that permits it to store an electrical charge. In circuit protection, the off-state capacitance is typically measured at 1 MHz with a 2V bias applied. Reverse Standoff Voltage (V R) In the case of a uni-directional TVS diode, this is the maximum peak voltage that may be applied in the ‘blocking direction’ with no significant current flow. In the case of a bi-directional transient, it applies in either direction. It is the same definition as Maximum Off-state Voltage and Maximum Working Voltage. Breakdown Voltage (V BR) Breakdown voltage measured at a specified DC test current, typically 1mA. Usually a minimum and maximum is specified. Peak Pulse Current (I PP) Maximum pulse current which can be applied repetitively. Usually a 10x1000μs double exponential waveform, but can also be 8x20μs, if stated. Maximum Clamping Voltage (V C or VCI) Maximum voltage which can be measured across the protector when subjected to the Maximum Peak Pulse Current. Peak Pulse Power (P PP) Expressed in Watts or Kilowatts, for a 1ms exponential transient (see figure 1, page 23) it is I PP multiplied by VCL. TVS Diode Terms & Definitions 1. Define Circuit Operating Parameters Normal operating voltage type in DC or AC: Device Type Required: Uni-drectional Bi-directional Normal operating voltage in volts: Maximum transient current (Ipp): Maximum clamping voltage (Vc): Required peak reverse surge power rating: Product mounting type (package): Operating temperature: 2. Narrow TVS Diode Series for the Application Please refer to the product selection charts and data sheets within this guide, factoring these key parameters: Reverse Standoff Voltage (V R): The device V R should be equal to, or great than, the peak operating level of the circuit (or part of the circuit) to be protected. This is to ensure that TVS Diode does not clip the circuit drive voltage. Peak Pulse Current (I PP): The Peak Pulse Current (I PP) identifies the maximum current the TVS Diode can withstand without damage. The required I PP can only be determined by dividing the peak transient voltage by the source impedance. Note that the TVS Diode failure mechanism is a short circuit; if the TVS Diode fails due to a transient, the circuit will still be protected. Maximum Clamping Voltage (V C): This the peak voltage that will appear across the TVS Diode when subjected to the Peak Pulse Current (I PP), based on 10X1000us exponential waveform. The V C of each TVS Diode is identified in each series data sheet electrical characteristics table. 3. Verify Ambient Operating Parameters Ensure that the application voltage is less than or equal to the device’s standoff voltage, and that the operating temperature limits are within those specified by the device. 4. Verify Device Mounting Style and Dimensions Please refer to the dimension drawings contained within the data sheet of each series. 5.Test the Selected Device in Actual Application Please contact Littelfuse if you would like assistance with testing and verifying suitability of a Littelfuse device within your product. We have extensive product testing lab capabilities and technical expertise to assist you. TVS Diode Selection Checklist |
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