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

2030-23T-SM-RPLF

Manufacturer Part Number

2030-23T-SM-RPLF

Description

MINI TRIGARD SURFACE MOUNT GDT

Manufacturer

Bourns Inc.

Series

TRIGARD™ 2030r

Datasheet

1.2030-23T-SM-RPLF.pdf (5 pages)

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

Available stocks

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Quantity

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

2030-23T-SM-RPLF

Manufacturer:

BOURNS

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1 200

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Implementing Advanced Circuit Protection

Technologies for RS-485 Ports

In the development of today’s process control architectures and closed-loop systems there are

numerous serial drops using point to point, multi-drop or multipoint systems. The distances

between serial drops can range from several hundred meters to over a thousand meters. Using

data transfer protocols such as LVDS, TIA/EIA-232, TIA/EIA-422, TIA/EIA-485, field buses,

CAN, Profibus, and Interbus enables the communication among the various remote devices such

as sensors, actuators or monitors connected throughout the system. RS-485 is one of the most

common interface standards, and due to their prevalence in industrial settings RS-485 systems

TBU-CA065-100-WH

must be capable of operating in very noisy and harsh electrical environments. In order to avoid

damage and overload of the system, the use of robust and reliable circuit protection is required.

This application note describes the need for circuit protection on RS-485 serial device ports, and

introduces a solution using Bourns Transient Blocking Unit (TBU™), gas discharge tube (GDT)

and Transient Voltage Suppression (TVS) products to meet the required industry standards on

RS-485 port interfaces.

2030-23T-SM-RPLF

Introduction to RS-485

RS-485 is a standard communication network for industrial communications, and features

fast data rates achieving 35 Mbps for short distances and 100 kbps over longer distances.

When covering longer distances, it is not unusual to encounter mis-wiring and short-circuit

faults. Transients and surges also can be generated by induced energy on the data lines due

to environmental conditions or switching of heavy inductive loads. Any of these issues can

seriously affect the data transfer performance on the serial port. One common application of

RS-485 that illustrates its sensitivity is an elevator control system. With cables in motion and

large motors and inductors in proximity, rugged communication systems are required. RS-485 is

also commonly deployed in building automation, security system controls, and other industrial

CDSOT23-SM712

communication applications.

RS-485 systems are inherently more robust than many other networks because the signal is

delivered differentially between two wires relative to a third reference voltage. The reference

voltage is often, but not always, the local earth potential. This provides substantial immunity to

common-mode noise such as ground noise and induced noise from nearby motors, solenoids

and transformers. The interface uses voltages that are high by communication system standards,

also making it more robust than networks using other protocols. For instance, Ethernet signals

are about 2 V, though much internal communication in a computer is even lower, and the

popular USB standard communicates at a maximum of 5 V. RS-485, on the other hand, allows

for common-mode voltages from -7 volts to +12 volts. Voltage drop between distant nodes can

be accommodated without adding expensive equipment along the path.

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2030-23T-SM-RPLF Summary of contents

Page 1

... Bourns Transient Blocking Unit (TBU™), gas discharge tube (GDT) and Transient Voltage Suppression (TVS) products to meet the required industry standards on RS-485 port interfaces. 2030-23T-SM-RPLF Introduction to RS-485 RS-485 is a standard communication network for industrial communications, and features fast data rates achieving 35 Mbps for short distances and 100 kbps over longer distances. ...

Page 2

... Max. number of drivers Max. number of receivers Modes of operation Network topology Max. distance Max. speed 2030-23T-SM-RPLF Max. speed at 1200 m Receiver input sensitivity Receiver input range Max. driver output voltage Max. driver output voltage with load Every serial port design depends on the recommended voltage range for the bus pins. RS-485 defines how much protection the device has beyond the − ...

Page 3

... RS-485 interface where they would lack if used independently. The GDT can handle extremely high currents but has a high threshold voltage 2030-23T-SM-RPLF and may not trigger in time. The TBU™ device has a small series impedance that limits current and voltage to which the equipment is exposed. The GDT device protects the TBU™ ...

Page 4

... 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 ...

Page 5

... TBU™ device can reduce the overall board area compared to what was required previously to meet the protection requirements. The use of Bourns® TBU™ devices brings a new level of overvoltage and overcurrent protection to RS-485 drivers. 2030-23T-SM-RPLF Why Bourns? TBU™ technology is unique to Bourns, a company that has been a proven leader in the circuit protection industry for several decades ...

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