TBU-LAB1 Bourns Inc., TBU-LAB1 Datasheet

TBU-LAB1

Manufacturer Part Number

TBU-LAB1

Description

SLIC PROTECTION KIT

Manufacturer

Bourns Inc.

Series

TBU™r

Datasheets

1.TBU-DESIGNKIT.pdf (8 pages)

2.TBU-PL050-100-WH.pdf (7 pages)

3.TBU-LAB3.pdf (9 pages)

4.TBU-LAB3.pdf (5 pages)

Specifications of TBU-LAB1

Kit Type

SLIC Protection

Kit Contents

(10) MOV-10D431K-ND - 10MM RADIAL DISC MOV(10) MOV-10D391K-ND - 10MM RADIAL DISC MOV(10) MOV-10D201K-ND - 10MM RADIAL DISC MOV(10) MOV-07D201K-ND - 7MM RADIAL DISC MOV(5) TBU-PL085-200-WHCT-ND - SURGE SUPP TBU DL 50OHM 850VIMP(5) TBU-PL085-100-WHCT-ND - SURGE SUPP TBU DL 50OHM 850VIMP(5) TBU-PL075-200-WHCT-ND - SURGE SUPP TBU DL 50OHM 750VIMP(5) TBU-PL075-100-WHCT-ND - SURGE SUPP TBU DL 50OHM 750VIMP(5) TBU-PL060-200-WHCT-ND - SURGE SUPP TBU DL 50OHM 600VIMP(5) TBU-PL060-100-WHCT-ND - SURGE SUPP TBU DL 50OHM 600VIMP(5) TBU-PL050-200-WHCT-ND - SURGE SUPP TBU DL 50OHM 500VIMP(5) TBU-PL050-100-WHCT-ND - SURGE SUPP TBU DL 50OHM 500VIMP(10) MOV-07D391K-ND - VARISTOR 390V 7MM RADIAL(5) TBU-PK085-100-WHCT-ND - SURGE SUPP TBU DL 100MA 850VIMP(5) TBU-PK060-100-WHCT-ND - SURGE SUPP TBU DL 100MA 600VIMP(5) TBU-PK050-100-WHCT-ND - SURGE SUPP TBU DL 100MA 500VIMP

Lead Free Status / Rohs Status

Request inventory verification / RoHS Compliant

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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® TBU® High-Speed Protector (HSP), 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 miswiring 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.

05/11 • e/CPK1047

Related parts for TBU-LAB1

TBU-LAB1 Summary of contents

Page 1

... This application note describes the need for circuit protection on RS-485 serial device ports, and introduces a solution using Bourns® TBU® High-Speed Protector (HSP), Gas Discharge Tube (GDT) and Transient Voltage Suppression (TVS) products to meet the required industry standards on RS-485 port interfaces ...

Page 2

... Displayed in Table 1 are the interface specifications for RS-485 ports. Key electrical parameters +12 V operating voltage with 32 Mbps data transfer at distances of 1200 m are included. A fully compliant RS-485 port must meet IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT) and IEC 61000-4-5 (Surge) standards. TBU-CA065-100-WH Table 1: RS-485 Interface Specifications Differential Max. number of drivers Max ...

Page 3

... The TBU® HSP offers a significant performance increase in terms of response time easy to place and route a TBU® HSP in a design since the TBU-CA package measures a mere 6 mm. The TBU® HSP is provided in a surface mount DFN package and meets industry standard requirements such as RoHS* and Pb Free solder reflow profiles ...

Page 4

... TBU® HSP. Due to the layered protection scheme, the TVS array is fully protected by the TBU® HSP and the TBU® HSP 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. 05/11 • ...

Page 5

... RS-485 drivers. 2030-23T-SM-RPLF Why Bourns? TBU® HSP technology is unique to Bourns, a company that has been a proven leader in the circuit protection industry for several decades. Bourns invests in innovative new products through internal development and strategic acquisition of companies or products lines. Bourns serves diverse markets from computers and peripherals to telecommunications. The company’ ...

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