THVD1400, THVD1420 3.3-V to 5-V RS-485 Transceivers in Small Package

with ±12-kV IEC ESD Protection

1 Features

• Meets or exceeds the requirements of the TIA/

EIA-485A standard

• 3-V to 5.5-V Supply voltage

• Half-duplex RS-422/RS-485

• Data rates

– THVD1400: 500 kbps

– THVD1420: 12 Mbps

• Bus I/O protection

– ±16-kV HBM ESD

– ±12-kV IEC 61000-4-2 Contact discharge

– ±15-kV IEC 61000-4-2 Air gap discharge

– ±4-kV IEC 61000-4-4 Fast transient burst

– ±16-V bus fault protection (absolute max

voltage on bus pins)

• Small, space-saving 8-pin SOT package option

(2.1 mm x 1.2 mm)

– See the layout example for co-layout with

standard SOIC-8 package

• Extended industrial temperature range: -40°C to

125°C

• Large receiver hysteresis for noise rejection

• Low power consumption

– Low standby supply current: < 1 µA

– Quiescent current during operation: 1.5 mA

(typ)

• Glitch-free power-up/down for hot plug-in capability

• Open, short, and idle bus failsafe

• 1/8 Unit load (Up to 256 bus nodes)

2 Applications

• Factory automation & control

• Building automation

• Grid infrastructure

• Motor drives

• Power delivery

• Industrial transport

• HVAC systems

• Video surveillance

• Smart meters

Description

THVD1400 and THVD1420 are robust half-duplex

RS-485 transceivers for industrial applications. The

bus pins are immune to high levels of IEC Contact

Discharge ESD events, eliminating the need for

additional system level protection components.

The devices operate from a single 3 to 5.5-V supply.

The wide common-mode voltage range and low input

leakage on bus pins make the devices suitable for

multi-point applications over long cable runs.

THVD1400

and

THVD1420

are

available

in

industry standard, 8-pin SOIC package for drop-in

compatibility as well as in the industry-leading, small

SOT package. The devices are characterized for

ambient temperatures from –40°C to 125°C.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

THVD1400

THVD1420

SOT (8)

2.1 mm x 1.2 mm

SOIC (8)

4.90 mm × 3.91 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

A

B

7

6

R

D

1

4

RE

DE

2

3

Simplified Schematic

THVD1400, THVD1420

SLLSF78B – DECEMBER 2020 – REVISED OCTOBER 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.