2031-23T-SM-RPLF datasheet(1/2 Pages) BOURNS

No. de pieza	2031-23T-SM-RPLF

Descripción Electrónicos	RS-485 Port Protection Evaluation Board 1

PDF	2 Pages

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Fabricante Electrónico	BOURNS [Bourns Electronic Solutions]

Página de inicio	http://www.bourns.com

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RS-485 Port Protection

Evaluation Board 1

10/12 • FU1213

RS-485 Evaluation Board Bill of Materials

Table 1

No.

Part Number

Qty.

Description

Reference

1

TBU-CA065-200-WH

2

TBU® Single Bidirectional Line 650 V 200 mA TBU® HSP 1, TBU® HSP 2

2

2031-23T-SM-RPLF

2

Single Line Fast-acting GDT 650 V

GDT1, GDT2

3

SMBJ12CA

2

Single Bidirectional Line TVS 12 V SMB

TVS1, TVS2

Introduction

This Evaluation Board serves as an aid in

evaluating circuit protection on RS-485

serial device ports, using two Bourns®

TBU® High-Speed Protectors (HSP), two

fast-acting GDTs and two TVS diodes to

meet the required industry standards on

RS-485 port interfaces. The recommended

Bourns® TBU® device solution, with a

low capacitance GDT, offers enhanced

high-speed performance features over

competing technologies, which can help

the design engineer increase the surge and

transient protection level on RS-485 ports

and place the entire circuit protection

solution into a smaller reduced PCB

area. Bourns has developed an RS-485

Evaluation Board (measuring 45 mm x

21 mm x 1.2 mm) manufactured using FR4

PCB with nickel gold plating on the top

and bottom sides.

How to Connect the Evaluation

Board for Test Set-up

• Connect IN1 and IN2 to the

exposed lines.

• Connect OUT1 and OUT2 to the

RS-485 IC device.

* The default configuration of this board uses 2 GDTs

(GDT1, GDT2) and discrete SMB TVS diodes

(TVS1,TVS2). The board allows different configurations:

• 2 single 2031 GDTs (GDT1 and GDT2) may be

replaced by a dual 2030 GDT (GDT3)

• 2 SMB TVS diodes (TVS1 and TVS2) may be

replaced with a) 2 SOT23 TVS diodes (TVS3, TVS4)

or b) a single TVS diode array (TVS5)

RS-485 Evaluation Board Top Side Layout*

RS-485 Evaluation Board Schematic

Figure 2

Figure 1

1

TBU® HSP 1

IN1

IN2

GND

OUT1

OUT2

GND

TVS5

TVS3

TVS4

TVS1

TVS2

GDT3

GDT1

GDT2

TBU® HSP 2

1

3

2

1

3

2

1

3

2

1

12

1

11

2

1

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