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Desktop Computer System

System View | Block Diagram
Protection Area Illustration (click to open larger image in new window)
  1. AC Power
  2. Analog Audio
  3. Buttons
  4. CD / DVD ROM
  5. CPU Protection
  6. DVI Port
  7. Hard Drive
  8. HDMI Port
  9. Headphone Jack
  10. IEEE 1394 FireWire
  11. LCD Monitor Controller
  12. IEEE 1284 Parallel Port
  13. PS/2 Port
  14. RS-232
  15. Ethernet
  16. Phone / Modem
  17. Desktop Speaker
  18. S-Video
  19. SCSI I/O Bus
  20. USB 2.0 Port
Desktop System Headphone Jack CD / DVD ROM CD / DVD ROM LCD Monitor Controller/Inverter Desktop Speaker Desktop Speaker AC Power CD / DVD ROM CPU Protection IEEE 1284 (Printer Port) Parallel Port Parallel Port Hard Disk Drive S-Video USB Desktop Speaker HDMI Port DVI Port RS-232 RS-232 Hard Drive Ethernet Port PS/2 Port CPU LCD Monitor Controller USB 2.0 Port IEEE 1394 FireWire Headphone Jack SCSI I/O Bus SCSI Rj-11 Modem Port Mouse Keyboard / Buttons RJ-11 Modem Port

RS-232 Port Protection

Problem: Short-circuit overload

RS-232 cable can be mis-connected or a foreign metal object placed into the connector can cause an overcurrent event, which could damage internal electronics.
 

Solution: PolySwitch devices.

PolySwitch devices help limit the flow of dangerously high currents during fault conditions and reset back to normal operating mode once the fault condition is removed.

 

Read more about the Raychem Surface-mount (SMD) PolySwitch device

Applicable Product Series: microSMD, nanoSMD
Download SMD Datasheet - (pdf 439KB)
Agency Recognition: UL E74889, TÜV R9872049, R9872048, R2172061, CSA 078165_C_000.
 

Read more about the Raychem Radial-leaded (R-line) PolySwitch device

Applicable Product Series: RUEF, RUSBF.
Download R-line Datasheet - (pdf 707KB)
Agency Recognition: UL E74889, CSA 078165_C_000, TÜV.

 

Problem: Transient Surge Voltages and Electrostatic Discharge (ESD)

Transient surge voltages caused by lightning strikes and equipment switching operations and also electrostatic discharge (ESD) can damage the equipment.
 

Solution: Gas Discharge Tubes (GDTs).

Gas Discharge Tubes (GDTs) help protect the sensitive data transmission lines equipment by switching to a low impedance state, and diverting energy away from the equipment. Due to their low capacitance, the GDTs introduce much less signal distortion than other overvoltage protection technologies.

 

Read more about Radial-leaded Metal Oxide Varistors

Applicable Product Series: ROV
Download ROV Datasheet - (pdf 2.17MB)
Agency recognitions: UL1414 E223034, UL1449 E223033, CSA 220978, VDE 40006997

 

Circuit Diagram / Schematic
 

Application Notes:

• LNB Satellite Set-Top Appnote - (pdf 65KB)
• I/O Ports Appnote - (pdf 50KB)

Related Technical Information:
• Fundamentals of PolySwitch Overcurrent and Overtemperature Devices - (pdf 169KB)
• Selection Guide for PolySwitch Devices and Technology Summary - (pdf 1,550KB)
 

Competitor Cross-reference

Cross-reference competitor products
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