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.