TSS Thyristor Surge Suppressor Selection with YINT Models

P0080SBL P0640SBL P0640SAL P1100SBL and P1300SBL for communication lines

A TSS thyristor surge suppressor protects a communication line by switching from a high-impedance state to a low-voltage conducting state when the surge reaches its breakover voltage. The device carries the surge away from the line interface and resets after current falls below its holding current.

YINT Electronics offers TSS voltage families for telephone equipment, xDSL, RS-485 and security wiring. The model number must match the normal line voltage before surge capability or package is considered.

YINT TSS model guide Match VDRM switching voltage holding current capacitance package and surge waveform to the line

How the Thyristor Crowbar Protects a Port

During normal traffic, the TSS remains off and adds only its specified leakage and capacitance. A surge that reaches the switching point turns on the thyristor structure. Current then flows through a low on-state voltage path instead of the protected transceiver.

Reset depends on holding current. The line source and series impedance must allow current to fall below that value after the event. This is why TSS selection includes the power-feed behavior, not only the surge voltage.

YINT PXXXSBL Voltage Options

The PXXXSBL family uses a DO-214AA SMB package and provides several off-state voltage choices. P0080SBL serves very low-voltage lines. P0640SBL covers a 58 V VDRM class. P1100SBL raises VDRM to 90 V, and P1300SBL supports 120 V.

The table uses published family data at 25 degrees C. Select VDRM above every valid line condition, then confirm that the maximum switching voltage remains compatible with the protected interface.

P0640SAL for 58 V Stand Off Applications

YINT P0640SAL is an SMB product with 58 V minimum stand-off voltage, 77 V maximum switching voltage and 120 mA minimum holding current. Published surge ratings are 150 A at 8/20 microseconds and 45 A at 10/1000 microseconds, with 40 pF maximum capacitance and 1 microampere maximum off-state leakage.

This combination provides a concrete choice for telecom and data interfaces whose normal voltage stays below the stand-off rating. Signal bandwidth, source impedance and required surge standard still determine final suitability.

Match Each Model to the Line Voltage

P0080SBL can be evaluated for low-voltage communication nodes because its VDRM is 6 V and maximum switching voltage is 15 V. P0640SBL and P0640SAL serve the 58 V stand-off class. P1100SBL is relevant to lines needing 90 V VDRM, while P1300SBL extends the family to 120 V VDRM.

A higher-voltage TSS is not automatically better. Excess switching voltage can expose the line IC to greater stress, while a voltage rating that is too low can trigger during normal operation.

Product Selection Summary

Coordinate TSS with the Surge Front End

An exposed copper pair may use a gas discharge tube at the line entry, a resistor or PPTC for current coordination, and a TSS close to the transformer or line interface. The GDT carries high energy, the series element controls follow current, and the TSS limits the remaining voltage near the electronics.

Keep the discharge path short and maintain the required creepage and clearance. Test the complete assembly with the specified telecom or industrial waveform because PCB inductance and grounding influence the residual voltage.

Requesting a YINT TSS Recommendation

Provide the highest normal line voltage, signal bandwidth, surge waveform and peak current, source impedance, holding-current constraint and preferred package. YINT can then identify the suitable voltage family and provide samples for port-level testing.

This information also helps determine whether P0640SAL, a PXXXSBL model or another package family is the better fit.

FAQ

1. Which YINT TSS model is used for a 58 V stand-off class?

P0640SBL and P0640SAL are 58 V VDRM or stand-off options with a 77 V maximum switching voltage.

2. What is the voltage range of P1100SBL?

Its published VDRM is 90 V and its maximum switching voltage is 130 V.

3. Which model serves a very low-voltage line?

P0080SBL has a 6 V VDRM and a 15 V maximum switching voltage.

4. What surge current is published for P0640SAL?

The product page lists 150 A for an 8/20 microsecond waveform and 45 A for a 10/1000 microsecond waveform.

5. Why must holding current be checked?

The line current must fall below the holding value for the TSS to return to its off state after a surge.

6. Can the same TSS protect telephone and RS-485 lines?

Only when the normal voltage, surge waveform, capacitance and source conditions all match. Select the YINT voltage family for the actual port.

Conclusion

YINT TSS selection starts with the normal line voltage. P0080SBL covers a low-voltage class, P0640SBL and P0640SAL address 58 V stand-off applications, P1100SBL supports 90 V VDRM, and P1300SBL reaches 120 V VDRM. Surge waveform, holding current, capacitance and the surrounding protection network then determine the final product.

Product links: TSS portfolio | YINT P0640SAL product page. For selection, samples or a quotation, contact YINT Electronics or email global@yint.com.cn.