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RS485

 

Solution Circuit Diagram

 

Application Environment

1.RS485 is half duplex communicating way, long wiring distance will arouse over voltage

    condition easily

2.RS485 wiring is arranged outdoors and can be easily stricken by lighting

3.RS485 wiring can easily get interfered by other wirings

 

Solution Descriptions

1.Use GDT device in the primary protection for common mode protection.

2.Use PTC device in the secondary protection to make the GDT device trip more easily and

    achieve bleeder current effect.

3.Use 3 pieces of TSS in the last protection. It has low clamping voltage, short response time,

    no signal attenuation, no impact to the control line transmission, and common mode & different mode dual protection.

4.Meet the ITU.K.21 etc. surge test standard.

5.Can pass the ITU.K.21 10/700μs-5/320μs 40Ω DM/CM:6KV surge test.

 

Protection Components for Recommendation

 

wayon

part number

Vdrm

Idrm

Vbo

Ih

Vpp

Co

package

Product link

(V)

Max (μA)

Max(V)

Min(mA)

10/700μs(V)

PF

WES1006S

6

5

15

50

6000

100

SMB

 

wayon

Part Number

DC breakdown

Voltage 

Tolerance

of Vs 

Impulse

Spark-over 

Impulse

Discharge

Current

Capacitance

at 1 MHz

Package

Product link

 100V/S (V)

(V)

1KV/μs (V)

8/20 μs (KA)

(PF)

GDTN3RD5-420

420±20%

400-600

100

5

<1.2

 Ø5.0×T7.6

 

Wayon

part number

IH

Vmax

Pd

Rmin

R1max

package

Product link

(A)

V

W

Ω

Ω

LB120F

0.12

250

1

4

12

6.5×11×4.6

 

Application Solution PDF File

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