16000-ECG NTE | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 4

Technical content

NTE16000−ECG thru NTE16022−ECG Polymeric Positive Temperature Coefficient (PTC) Resettable Fuses Features: Applications:

  • Radial Leaded, High Hold Current, Solid State • Computers & Peripherals
  • Operation Current: 100mA∼9A • Security and Fire Alarm Systems
  • Maximum Voltage: 30V • General Electronics
  • Temperature Range: −40°C to +85°C • Loud Speakers
  • Cured, Flame Retardant Epoxy Polymer • Automotive Applications Insulating Material Meets UL 94V−0 • Power Transformers

ELECTRICAL CHARACTERISTICS

IHold ITrip Initial resistance

1 Hour (R1)

Post−Trip Resistance Max. Time To Trip at 5*lh Tripped Power Dissipation Diag. V max. I max. Amperes at 23/C0053C Ohms at 23/C0053C Ohms at 23/C0053C Seconds at 23/C0053C Watts at 23/C0053C NTE Type No. Diag. No. V max. Volts I max. Amps Hold Trip Min. Max Max. * Tested at 40 Amps. TECHNICAL DATA Operating/Storage Temperature −40°C to +85°C Maximum Device Surface Temperature in Tripped State +125°C Passive Aging +85°C, 1000 Hours ±5% Typical Resistance Change Humidity Aging +85°C, 85% R.H. 1000 Hours ±5% Typical Resistance Change Thermal Shock +125°C/−40°C 10 Times ±10% Typical Resistance Change Mechanical Shock MIL−STD−202, Method 213, Condition 1 (100g, 6 Seconds) No Resistance Change Solvent Resistance MIL−STD−202, Method 215 No Change Vibration MIL−STD−883C, Method 2007.1, Condition A No Change

TEST PROCEDURES AND REQUIREMENTS Test Test Condition Accept/Reject Criteria Visual/Mechanical Verify Dimensions and Materials Per PF Physical Description Resistance In Still Air @ +23°C Rmin ≤ R ≤ Rmax Time to Trip 5 Times IHold, Vmax, +23°C T ≤ Max. Time to Trip (Seconds) Hold Current 30 Min. at IHold No trip Trip Cycle Life Vmax, Imax, 100 Cycles No Arcing or Burning Trip Endurance Vmax, 48 Hours No Arcing or Burning Solvent Resistance MIL−STD−202, Method 215 No Change Vibration MIL−STD−883C, Method 2007.1, Condition A No Change TYPICAL TIME TO TRIP AT +23/C0053 0.1 1 10 100 100 0.1 0.0 0.001 Fault Current (Amps) Time to Trip (Seconds) THERMAL DERATING CHART − IHOLD (Amps) * Ambient Operating Temperature NTE Type No. −40/C0053C −20/C0053C 0/C0053C +23/C0053C +40/C0053C +50/C0053C +60/C0053C +70/C0053C +85/C0053C *I Trip = 2 • IHold

DIMENSIONAL OUTLINE DRAWINGS Diagram 629 Diagram 630 NOTE: Shape changes from round to square starting with NTE16016−ECG. A B C D E EA C B D PRODUCT DIMENSIONS (Dimensions are in inches(mm)) A B C D E Physical Characteristice

RESETTABLE CIRCUIT PROTECTION When it comes to Polyme ric Positive Temperature Coefficient (PPTC) circuit protection, you now have a choice. Polymeric fuses are made from a conductive plastic formed into thin sheets, with electrodes attached to either side. The conductive plastic is manufactured from a non− conductive crystalline polymer and a highly conductive carbon balck. The electrodes ensure even distribution of power through the device, and provide a surface for leads to be attached or for custom mounting. The phenomenon that allows conductive plastic materi- als to be used for resettable overcurrent protection de- vices is that they exhibit a very large non−linear Positive Temperature Coefficient (PTC) effect when heated. PTC is a characteristic that many materials exhibit whereby re- sistance increases with temperature. What makes the polymeric conductive plastic material unique is the magni- tude of its resistance increase. At a specific transition tem- perature, the increase is resistance is so great that it is typ- ically expressed on a log scale. HOW POLYMERIC RESETTABLE OVERCURRENT PROTECTORS WORK The conductive carbon black filler material in the poly- meric device is dispersed in a polymer that has a crystal- line structure. The crystalline structure densely packs the carbon particles into its crystalline boundry so they are close enough together to allow current to flow through the polymer insulator via these carbon “chains”. When the conductive plastic material is at normal room temperature, there are numerous carbon chains forming conductive paths through the material. Under fault conditions, excessive current flows through the polymeric device. I 2R heating causes the conductive plastic material’s temperature to rise. As this self heating continues, the material’s temperature continues to rise until it exceeds its phase transformation temperature. As the material passes through this phase transformation temperature, the densely packed crystalline polymer ma- trix changes to an amorphous structure. This phase change is accompanied by a small expansion. As the con- ductive particles move apart from each other, most of them no longer conduct current and the resistance of the device increases sharply. 0 20 40 60 80 100 120 140 TEMPERATURE °C 101 100 102 103 104 105 106 107 LOG R OHMS The material will stay “hot”, remaining in this high resist- ance state as long as the power is applied. The device will remain latched, providing continuous protection, until the fault is cleared and the power is removed. Reversing the phase transformation allows the carbon chains to re−form as the polymer re−crystallizes. The resistance quickly re- turns to its original value. PRODUCT SELECTION To select the correct polymeric circuit protection device, complete the imformation listed below for application, and then refer to thwe resettable overcurrent protector data sheets. 1. Determine the nromal operating current: 2. Determine the maximum circuit voltage (Vmax): 3. Determine the fault current (Imax): 4. Determine the operating temperature range: 5. Select a product family so that the maximum rating for Vmax and Imax is higher than the maximum circuit volt- age and fault current in the application. 6. Using the IHold vs. Temperature Table on the product family data sheet, select the polymeric device at the maximum operating temperature with an I Hold greater than or equal to the normal operating current. 7. Verify that the selected device will trip under fault con- ditions by checking in the ITrip table that the fault cur- rent is greater than ITrip for the selected device, at the lowest operating temperature. 8. Order samples and test in application.

APPLICATIONS

The benefits of polymeric Resettable Overcurrent Pro- tectors are being recognized by more and more design engineers, and new applications are being discovered ev- ery day. The use of polymeric types of devices have been widely accepted in the following applications and industries: /C0068Personal computers /C0068Laptop computers /C0068Personal digital assistants /C0068Transformers /C0068Small and medium electric motors /C0068Audio equipment and speakers /C0068Test and measurement equipment /C0068Security and fire alarm systems /C0068Personal care products /C0068Point−of−sale equipment /C0068Industrial controls /C0068Automotive electronics and harness protection /C0068Marine electronics /C0068Battery−operated toys