ThyrisTors
World Products, LLC 19654 Eighth Street East, Sonoma, CA 95476 | Phone (707) 996-5201 | Fax (707) 996-3380 | www.worldproducts.com Rev. 3.1 (11.23.10)
Thyristors | 3
Features
• Protects by Limiting voltages and shunting surge currents away from sensitive circuits.
• Designed for telecommunications applications such as line cards, modems, PBX, FAX, LAN, VHDSL.
• Helps meet standards such as GR1089, ITU K.20, IEC950, UL1459&50, FCC part 68.
• Low capacitance, High surge (C, D, E rating available), precise voltage limiting, Long life.
• RoHS compliant with Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003 on
the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS Directive)
and comply to a maximum concentration value of 0.1% by weight in homogeneous materials for lead (Pb), mercury,
hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) and of 0.01%
weight in homogeneous materials for cadmium.
Selection Guide
Follow these steps to select the proper Thyristor surge protector for your application:
1. Dene the operating parameters for the circuit:
• Ambient operating temperature range
• Maximum telephone line operating current (highest battery and shortest copper loop)
• Maximum operating voltage: (Maximum DC bias + peak ringing voltage)
• Maximum surge current
• System voltage damage threshold
2. Select device with an off-state voltage rating (VDRM) above the maximum operating voltage at the minimum
operating temperature.
3. Select surge current ratings (IPPS and ITSM) > those which the application must withstand
4. Verify that the minimum holding current of the device at the maximum ambient temperature is above the
maximum DC current of the system.
5. Verify that the maximum breakover voltage of the device is below the system damage threshold.
6. Verify that the circuit’s ambient operating temperatures are within the device’s operating temperature range.
7. Verify that the device’s dimensions t the application’s space considerations.
8. Independently evaluate and test the suitability and performance of the device in the application.