Texas Instruments THVD1424RGTR

Overview

THVD1424RGTR from Texas Instruments is a 3-V to 5.5-V RS-485 transceiver with pin-configurable half/full-duplex operation, integrated 120-Ω switchable termination resistors on both driver (Y/Z) and receiver (A/B) bus terminals, and slew rate control enabling either 500 kbps (SLR = high) or 20 Mbps (SLR = low/floating) data rates. It delivers ±16-kV HBM ESD protection, operates across –40°C to 125°C, and targets industrial fieldbus nodes requiring flexible topology deployment.

For engineers reviewing the THVD1424RGTR datasheet, THVD1424RGTR pinout, THVD1424RGTR application, or THVD1424RGTR equivalent, key selection considerations include its dual-mode duplex switching capability, on-chip termination configurability per bus segment, thermal shutdown protection (150–170°C), fail-safe bus inputs (open/short/idle), and compatibility with PROFIBUS-level differential output (>2.1 V at 5 V).

Technical Context

The THVD1424RGTR implements a dual-supply architecture: VCC (3–5.5 V) powers the RS-485 bus interface, while VIO (1.65–5.5 V) independently supplies logic I/O, enabling interoperability with 1.8-V, 2.5-V, 3.3-V, or 5-V controllers. Its functional modes-half-duplex (H/F = high), full-duplex (H/F = low), termination enable/disable (TERM_TX/TERM_RX), and slew rate selection (SLR)-are all controlled by dedicated digital input pins with internal pull-downs or pull-ups.

Bus I/O features include ±16-V absolute maximum fault tolerance, ±8-kV IEC 61000-4-2 contact discharge protection, and failsafe receiver behavior under open, shorted, or idle bus conditions. The device supports hot-plug operation via glitch-free power-up/power-down sequencing and includes thermal shutdown with 15°C hysteresis to prevent damage during sustained overtemperature events.

Key Specifications

Pinout & Package

THVD1424RGTR is housed in a thermally efficient 16-pin VQFN package (3 mm × 3 mm) with an exposed thermal pad that must be connected to GND for optimal electrical performance and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RS-485 transceiver applications.

Compared with SN65HVD1477DR and MAX14783EASA+, THVD1424RGTR uniquely combines dual-supply operation, pin-selectable duplex mode, on-chip switchable termination, and dual-speed slew rate control - enabling one hardware design to support diverse network topologies and noise environments without layout changes.

Availability

THVD1424RGTR is available at Aetrix Electronics and suitable for factory automation, smart metering, and HVAC control applications requiring stable component supply, extended temperature operation, and reduced bill-of-materials complexity.

Supply support for THVD1424RGTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.

The THVD1424RGTR belongs to TI's high-reliability RS-485 transceiver portfolio, designed specifically for flexible, rugged industrial fieldbus nodes where topology adaptability, ESD resilience, and thermal robustness are critical.

FAQ

What is the function of the H/F pin on the THVD1424RGTR?

The H/F pin on the THVD1424RGTR controls duplex mode: when pulled low, it configures the device for full-duplex (four-wire) operation with dedicated A/B receiver inputs and Y/Z driver outputs; when pulled high, it enables half-duplex (two-wire) mode where Y/Z serve as bidirectional bus terminals. Internal pull-down ensures full-duplex is the default state, simplifying startup behavior in most applications. This pin eliminates the need for external mode-selection logic or firmware configuration.

Does the THVD1424RGTR support PROFIBUS compatibility?

Yes, the THVD1424RGTR supports PROFIBUS compatibility through its guaranteed differential output voltage of ≥2.1 V under 5-V VCC supply conditions - meeting the minimum requirement defined in EN 50170 for PROFIBUS DP physical layer transceivers. This specification holds across the full operating temperature range (–40°C to 125°C) and load conditions (RL = 54 Ω or 60 Ω), ensuring reliable signal integrity in industrial automation networks.

How does the THVD1424RGTR handle bus termination configuration?

The THVD1424RGTR provides independent, pin-controlled termination: TERM_TX enables a 120-Ω resistor between Y and Z (driver side), while TERM_RX enables a separate 120-Ω resistor between A and B (receiver side). Both pins are active-high with internal pull-downs, defaulting to disabled. This allows precise per-segment termination - e.g., enabling TERM_TX only at end-nodes in half-duplex chains or TERM_RX only at receiver-only nodes in full-duplex backbones - without external resistors or jumpers.

What is the purpose of the SLR pin on the THVD1424RGTR?

The SLR (Slew Rate) pin on the THVD1424RGTR selects between two data-rate profiles: logic high configures the driver for 500 kbps operation with controlled edge rates to minimize EMI in noise-sensitive environments; logic low or floating enables 20 Mbps high-speed mode. Internal pull-down ensures fast operation by default. This pin allows dynamic adaptation to network length, cable quality, and EMC requirements without changing hardware or firmware.

Can the THVD1424RGTR operate with different VCC and VIO supply voltages simultaneously?

Yes, the THVD1424RGTR supports independent VCC (3–5.5 V for bus interface) and VIO (1.65–5.5 V for logic I/O) supplies. This allows direct interfacing with low-voltage microcontrollers (e.g., 1.8-V or 2.5-V SoCs) while maintaining full RS-485 bus drive strength from a higher 5-V rail. Decoupling capacitors must be placed separately on each supply, and level-shifting logic is unnecessary - reducing system complexity and power domain interaction risks.