3.3 V

GND

D

DE

R

RE

Y

Z

RxD

TxD

DIR

MCU/

UART

10 k

10 k

TVS

R2

R1

SN65HVD33

100 nF

TVS

R2

R1

DIR

B

A

SN65HVD30-EP, SN65HVD31-EP, SN65HVD32-EP

SN65HVD33-EP, SN65HVD34-EP, SN65HVD35-EP

SGLS367E – SEPTEMBER 2006 – REVISED SEPTEMBER 2015

www.ti.com

10.2.2 Detailed Design Procedure

To protect bus nodes against high-energy transients, the implementation of external transient protection devices

is necessary (see Figure 30).

Figure 30. Transient Protection Against ESD, EFT, and Surge Transients

Table 9. Bill of Materials

DEVICE

FUNCTION

ORDER NUMBER

MANUFACTURER

XCVR

3.3-V Full-Duplex RS-485 Transceiver

SN65HVD33

TI

R1, R2

10-

Ω, Pulse-Proof Thick-Film Resistor

CRCW060310RJNEAHP

Vishay

TVS

Bidirectional 400-W Transient Suppressor

CDSOT23-SM712

Bourns

10.2.3 Application Curve

Signals from top to bottom: D, Y, Z, VOD

Figure 31. SN65HVD33-EP Transient Waveform

26

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