2030-23T-SM-RPLF Bourns Inc., 2030-23T-SM-RPLF Datasheet - Page 4

• Manufacturer Part Number: 2030-23T-SM-RPLF
• Description: MINI TRIGARD SURFACE MOUNT GDT
• Manufacturer: Bourns Inc.
• Series: TRIGARD™ 2030r

Specifications of 2030-23T-SM-RPLF

• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Implementing Advanced Circuit Protection Technologies for RS-485 Ports
Effective Circuit Protection in Action
The example in Figure 2 illustrates a full RS-485 protection solution using TVS diodes,
TBU™ devices, and GDTs. TVS diodes provide overvoltage protection against voltage surges.
To protect the TVS diode array against AC power cross events or large transients as well as
overcurrent protection for the RS-485 driver, a TBU™ fast current limiter is placed in each line.
TBU-CA065-100-WH
Each TBU™ provides sub-microsecond protection by transitioning to a protected state with
very high impedance within 1 µs if the line current should exceed 100 mA. Finally, to protect
the TBU devices from high voltage transients, a 2030-23T-SM-RPLF fast GDT is placed on the
line side of the node interface. These GDTs are designed to coordinate with the TBU™ device
to provide extremely fast voltage protection. If sustained power cross events are anticipated, an
additional fuse may be placed in each line to open in case of sustained GDT operation.
Vcc
TBU-CA065-100-WH
2030-23T-SM-RPLF
2030-23T-SM-RPLF
RS485
TBU-CA065-100-WH
CDSOT23-SM712
CDSOT23-SM712
Figure 2: RS-485 Protection with TVS, TBU™, and GDT Technology
The protection solution shown is very robust with the addition of the TBU™ to the circuit.
Designers of industrial RS-485 systems will find that the reliability of their hardware is taken
to new levels if this TBU™-based three stage solution is adopted. Three technologies work
together to provide this comprehensive, fast solution that was not achievable prior to the
release of the TBU™. Due to the layered protection scheme, the TVS array is fully protected by
the TBU™ device and the TBU™ device is fully protected by the Fast GDT. The limits of surge
protection are then those of the GDT itself. Alternative combinations can be created based
on the system specifications. Contact a Bourns Applications Engineer for furter support with
circuit protection designs for RS-485 interfaces.