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Texas Instruments THVD1406DRLR
- Part No.:
- THVD1406DRLR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- SOT-583
- Datasheet:
-
THVD1406DRLR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 SOT583
- Quantity:
- Payment:
- Shipping:
Inventory:6,030
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Product details
Overview
THVD1406DRLR from Texas Instruments is a half-duplex RS-485 transceiver with auto-direction control, 500-kbps data rate, ±12-kV IEC 61000-4-2 contact ESD protection, and 3.3-V to 5.5-V single-supply operation. It integrates driver and receiver functions in an 8-pin SOT package (2.1 mm × 1.2 mm), enabling space-constrained industrial bus nodes in factory automation and building control systems.
For engineers reviewing the THVD1406DRLR datasheet, THVD1406DRLR pinout, THVD1406DRLR application, or THVD1406DRLR equivalent, this device delivers verified auto-direction timing (tdevice_auto-dir = 4–14 µs), failsafe receiver behavior under open/short/idle bus conditions, low quiescent current (3 µA typ in shutdown), and robust ±16-V bus fault tolerance - all critical for reliable multi-node RS-485 deployment.
Technical Context
The THVD1406DRLR implements auto-direction control via its D input pin, eliminating separate DE/RE control lines and reducing GPIO or isolation channel count. Its internal logic enables driver activation for a fixed duration (4–14 µs) upon D transition, then automatically disables the driver and enables the receiver - supporting true half-duplex operation without external direction logic.
It features a failsafe receiver with VIT+ = –70 mV (typ), VIT– = –175 mV (typ), and hysteresis (VHYS) of 30–50 mV, ensuring high output during open, shorted, or idle bus states. Bus I/O pins withstand ±16-kV HBM, ±12-kV IEC 61000-4-2 contact, and ±4-kV IEC 61000-4-4 transient stress without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 500 kbps - supports medium-speed industrial communication over 1200+ meters at compliant signal integrity |
| Supply Voltage | 3.0 V to 5.5 V - interoperable with 3.3-V and 5-V logic domains without level-shifting |
| ESD Protection | ±12-kV IEC 61000-4-2 contact - eliminates need for external TVS diodes on A/B bus lines |
| Bus Fault Tolerance | ±16 V - survives common-mode surges and ground differentials in noisy factory environments |
| Quiescent Current | 3 µA (typ) in shutdown - enables ultra-low-power wake-on-bus activity in battery-backed nodes |
| Receiver Hysteresis | 30–50 mV - rejects noise-induced false transitions on long, unterminated, or noisy cables |
| Unit Load | 1/8 unit load - allows up to 256 nodes on a single RS-485 bus segment |
Pinout & Package
THVD1406DRLR uses an 8-pin SOT package (2.10 mm × 1.20 mm), optimized for high-density PCB layouts and compatible with SOIC-8 footprint co-layout guidelines per TI's layout example.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R | Receiver output | CMOS-compatible logic-level output reflecting bus differential state; high-impedance when RE = high |
| RE | Receiver enable (active low) | Internal 2-MΩ pull-up; ties to SHDN for auto-direction mode; disables receiver when high |
| SHDN | Shutdown enable (active low) | Internal 2-MΩ pull-up; places driver/receiver in ultra-low-power state (<6.9 µA) when low |
| D | Driver data input | Controls driver polarity and triggers auto-direction timing; internal pull-up ensures defined state when floating |
| GND | Ground reference | Common return for logic and bus circuitry; must be connected before VCC for glitch-free power-up |
| A / B | Differential bus I/O | Half-duplex RS-485 interface pins; tolerate ±16-V faults and ±12-kV IEC ESD without damage |
| VCC | Power supply | Single 3.0–5.5-V rail powering both logic and bus drivers; supports hot-plug with glitch-free startup |
Key Features
| Feature | Design Value |
|---|---|
| Auto-direction control | Eliminates dedicated DE/RE pins - reduces isolation component count by one channel and saves two MCU GPIOs |
| Failsafe receiver | Guarantees R = high during open, shorted, or idle bus conditions - prevents undefined UART framing errors |
| Low standby current | 3 µA typical shutdown current enables >10-year battery life in remote sensor nodes with periodic bus polling |
| Thermal shutdown | Activates at 150–170°C junction temperature with 15°C hysteresis - protects against sustained bus short-circuits |
| Small SOT package | 2.1 mm × 1.2 mm footprint saves >70% board area vs SOIC-8 - ideal for space-constrained DIN-rail modules |
Applications
| Factory Automation | Building Automation |
|---|---|
Use Scenario: PLC-to-I/O module communication across 300-m daisy-chained RS-485 networks in manufacturing cells. IC Role / Device Role / Timing Role: Half-duplex transceiver managing bidirectional Modbus RTU traffic using auto-direction control to minimize wiring complexity. Use Value: Eliminates separate direction-control signals and external ESD protection, reducing BOM cost and PCB layer count while maintaining 500-kbps throughput. |
Use Scenario: HVAC controller network integrating thermostats, valve actuators, and CO₂ sensors across multi-floor commercial buildings. IC Role / Device Role / Timing Role: Robust bus node transceiver handling intermittent command bursts and long-idle periods with failsafe receiver behavior. Use Value: ±12-kV IEC ESD immunity prevents field failures from static discharge during maintenance; 1/8 unit load supports 200+ node scalability. |
| Video Surveillance | Smart Meters |
Use Scenario: PTZ camera control and firmware updates over 150-m twisted-pair cabling in outdoor security installations. IC Role / Device Role / Timing Role: RS-485 interface IC providing galvanically isolated, noise-immune command channel with thermal shutdown safety. Use Value: ±16-V bus fault tolerance withstands lightning-induced ground differentials; large receiver hysteresis rejects EMI from adjacent AC power lines. |
Use Scenario: AMI (Advanced Metering Infrastructure) endpoint communicating consumption data to concentrators in utility substations. IC Role / Device Role / Timing Role: Low-power, failsafe transceiver enabling battery-operated meter wake-up and burst transmission every 15 minutes. Use Value: 3 µA shutdown current extends 10-year lithium-thionyl chloride battery life; auto-direction simplifies microcontroller firmware design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65HVD1470DR | Same 8-pin SOT package, 500-kbps rating, but lacks auto-direction control - requires external DE/RE logic | Needs additional GPIO or gate logic; less suitable for isolated or pin-constrained designs | Select when legacy control architecture already provides DE/RE signals and ESD margin exceeds ±12 kV |
| MAX13487EESA+ | SOIC-8 only; includes true fail-safe bias but no thermal shutdown; 500-kbps, ±15-kV ESD | Larger footprint; higher quiescent current (15 µA shutdown); no overtemperature protection | Prefer for non-thermal environments where SOIC-8 layout reuse is prioritized over size or safety |
Compared with SN65HVD1470DR and MAX13487EESA+, THVD1406DRLR uniquely combines auto-direction control, ultra-low shutdown current, thermal shutdown, and compact SOT packaging - making it optimal for next-generation space- and power-constrained industrial nodes requiring minimal external components.
Availability
THVD1406DRLR is available at Aetrix Electronics and suitable for factory automation, building management, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for THVD1406DRLR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The THVD14x6 product line targets robust, low-pin-count RS-485 communication in harsh industrial environments - emphasizing auto-direction simplification, integrated ESD resilience, and extended temperature operation (–40°C to 125°C).
FAQ
What is the auto-direction timing behavior of THVD1406DRLR?
The THVD1406DRLR activates its driver for 4–14 µs after a rising edge on the D pin when SHDN and RE are tied high. This fixed-duration drive window enables automatic half-duplex switching without external control logic. The exact tdevice_auto-dir varies with temperature and supply voltage, and is fully characterized in Section 6.8 of the THVD1406DRLR datasheet.
Does THVD1406DRLR require external ESD protection on the A/B bus lines?
No. THVD1406DRLR includes integrated ±12-kV IEC 61000-4-2 contact discharge and ±15-kV air-gap ESD protection on A and B pins. This eliminates the need for external TVS diodes in most industrial deployments, reducing BOM count and PCB area - confirmed by TI's system-level ESD test reports for THVD1406DRLR.
Can THVD1406DRLR operate with a 3.3-V supply and interface directly with 5-V microcontrollers?
Yes. THVD1406DRLR supports 3.0–5.5-V operation and has CMOS-compatible logic inputs (VIH = 2 V min, VIL = 0.8 V max). Its R output swings rail-to-rail (VOL < 0.4 V, VOH > VCC – 0.2 V), allowing direct connection to both 3.3-V and 5-V MCUs without level shifters - verified across –40°C to 125°C.
How does THVD1406DRLR handle open, shorted, or idle bus conditions?
THVD1406DRLR implements failsafe receiver behavior: its R output defaults to logic high when the bus is open, shorted (A-B ≈ 0 V), or idle (no driver active). This is achieved via asymmetric input thresholds (VIT+ = –70 mV typ, VIT– = –175 mV typ) and 30–50 mV hysteresis - preventing UART framing errors in real-world RS-485 networks.
What is the maximum number of THVD1406DRLR nodes supported on a single RS-485 bus?
THVD1406DRLR presents a 1/8 unit load (UL), meaning each device loads the bus with only 1/8 the impedance of a standard RS-485 UL (12 kΩ). This allows up to 256 nodes on a single terminated bus segment - confirmed by TI's electrical characterization and compliant with TIA/EIA-485A loading rules.
THVD1406DRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-583
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 50 mV
- Data Rate:
- 500kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-583
THVD1406DRLR FAQ
1.How can I place an order for THVD1406DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for THVD1406DRLR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THVD1406DRLR reliable?
The price and inventory of THVD1406DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THVD1406DRLR is usually 5 days.
3.What payment methods are accepted for THVD1406DRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THVD1406DRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THVD1406DRLR?
THVD1406DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THVD1406DRLR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THVD1406DRLR?
For technical support, including THVD1406DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THVD1406DRLR requirements.
6.How does Aetrix verify that THVD1406DRLR is sourced from the original manufacturer or authorized distributors?
All THVD1406DRLR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THVD1406DRLR meets industry standards.
7.What is the process for return or replacement of THVD1406DRLR?
All THVD1406DRLR units undergo pre-shipment inspection (PSI). If there is an issue with THVD1406DRLR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THVD1406DRLR part is unused and in its original packaging.
Return procedure for THVD1406DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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