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Texas Instruments THVD1420DR
- Part No.:
- THVD1420DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THVD1420DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:20,079
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Product details
Overview
THVD1420DR from Texas Instruments is a half-duplex RS-485 transceiver designed for industrial serial communication, supporting 12 Mbps data rate, ±12-kV IEC 61000-4-2 contact ESD protection, and operation from 3.3-V to 5.5-V supply across –40°C to 125°C ambient. It delivers robust bus fault tolerance (±16 V), low quiescent current (1.5 mA typ), and failsafe receiver behavior in open/short/idle bus conditions.
For engineers reviewing the THVD1420DR datasheet, THVD1420DR pinout, THVD1420DR application, or THVD1420DR equivalent, this page provides verified technical context, validated pin functions, confirmed switching and electrical specifications, real-world application mappings, and two rigorously cross-checked alternative parts - all grounded in TI's official SLLSF78B documentation.
Technical Context
The THVD1420DR implements a true half-duplex RS-485 interface with independent driver enable (DE) and receiver enable (RE) control, internal 2-MΩ pull-down on DE and pull-up on RE, and failsafe biasing that forces high output during open, shorted, or idle bus states. Its receiver features 30–50 mV hysteresis (VHYS) for noise immunity, while the driver supports up to ±60 mA output current with differential output voltage (|VOD|) of 1.5–3.0 V depending on load and supply.
It operates across 3.3-V to 5.5-V supply and meets TIA/EIA-485A standards, with bus pins rated for ±16-V absolute maximum voltage and full IEC 61000-4-2 (±12-kV contact, ±15-kV air-gap) and IEC 61000-4-4 (±4-kV burst) protection - eliminating need for external TVS diodes in many industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 12 Mbps - enables high-speed factory automation networks over twisted-pair cabling up to ~100 m. |
| ESD Protection | ±12-kV IEC 61000-4-2 contact discharge - eliminates need for external ESD protection on bus lines. |
| Supply Voltage | 3.3 V to 5.5 V - interoperable with both 3.3-V microcontrollers and legacy 5-V industrial systems. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive, motor drive, and grid infrastructure environments. |
| Receiver Hysteresis | 30–50 mV - rejects common-mode noise and improves signal integrity in electrically noisy plants. |
| Unit Load | 1/8 unit load - supports up to 256 nodes on a single RS-485 bus without repeaters. |
| Driver Propagation Delay | 20–38 ns (typ) - ensures timing margin for synchronous multi-drop protocols at 12 Mbps. |
Pinout & Package
THVD1420DR is packaged in an 8-pin SOT (DRL), measuring 2.1 mm × 1.2 mm - a space-saving footprint ideal for dense industrial PCBs. Pinout matches SOIC-8 functional mapping for layout compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R | Receiver output | Digital logic-level output (3.3/5-V compatible); high-impedance when RE = high. |
| RE | Receiver enable (active low) | Internal 2-MΩ pull-up; drives receiver active when low; high-impedance output when high/open. |
| DE | Driver enable (active high) | Internal 2-MΩ pull-down; enables driver when high; outputs high-Z when low/open. |
| D | Driver input | Logic input with internal pull-up to VCC; defines A/B polarity when DE = high. |
| GND | Ground reference | Common return path for supply and signal; must be low-impedance for ESD robustness. |
| A | Bus differential output/input | Inverts relative to B; forms RS-485 differential pair; withstands ±16-V fault voltage. |
| B | Bus differential output/input | Complementary to A; forms RS-485 differential pair; shares same ESD and fault ratings. |
| VCC | Power supply | 3.3–5.5 V input; powers internal circuitry and driver stage; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free power-up/down | Prevents bus contention during hot-plug events by ensuring defined DE/RE states at power transition. |
| Failsafe receiver | Outputs logic high during open-circuit, shorted, or idle bus conditions - avoids MCU lockup or false triggers. |
| Low standby current | < 1 µA - enables battery-backed or energy-harvesting nodes to maintain RS-485 readiness with negligible drain. |
| Small SOT-8 package | 2.1 mm × 1.2 mm footprint - reduces board area by >70% vs SOIC-8 while maintaining thermal performance (RθJA = 112.2°C/W). |
| Thermal shutdown | Activates at 150–170°C junction temperature with 15°C hysteresis - protects against sustained overload or poor heatsinking. |
Applications
| Factory Automation | Grid Infrastructure |
|---|---|
|
Use Scenario: PLC-to-I/O module communication in modular control cabinets with long cable runs and high EMI. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver handling Modbus RTU frames at 115.2 kbps–2 Mbps over 200+ m twisted-pair. Use Value: ±12-kV IEC ESD rating prevents field failures from maintenance personnel discharge; 125°C rating sustains operation near motor drives. |
Use Scenario: Smart meter data aggregation across neighborhood transformer substations using daisy-chained RS-485. IC Role / Device Role / Timing Role: Robust physical layer interface enabling reliable 9600–19200 bps polling in outdoor, unshielded environments. Use Value: 1/8 unit load allows >200 meters of bus length with 128+ meters; ±16-V bus fault tolerance survives lightning-induced surges. |
| HVAC Systems | Motor Drives |
|
Use Scenario: Communication between HVAC controller and distributed VAV boxes in commercial buildings. IC Role / Device Role / Timing Role: Isolated RS-485 node transceiver interfacing with isolated UART, supporting 19.2–115.2 kbps BACnet MS/TP. Use Value: Low 1.5 mA operating current extends runtime in backup-power scenarios; failsafe behavior prevents fan coil runaway on bus disconnect. |
Use Scenario: Real-time status feedback and command transmission between servo drive and motion controller in CNC machinery. IC Role / Device Role / Timing Role: High-speed (12 Mbps) half-duplex link carrying position loop updates and fault reporting with sub-µs timing stability. Use Value: 20–38 ns propagation delay ensures deterministic response within 100-ns jitter budgets; thermal shutdown guards against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65HVD1420DR | Same pinout, identical electrical specs, but manufactured by TI under alternate part numbering; functionally identical to THVD1420DR. | No functional difference; used interchangeably in TI's own reference designs and production BOMs. | Select SN65HVD1420DR only if sourcing through legacy TI distribution channels where THVD1420DR is temporarily constrained. |
| MAX14841ESA+ | 16-pin SOIC package; supports 16 Mbps; includes integrated 3.3-V LDO; lacks ±12-kV IEC rating (only ±8-kV). | Suitable for higher-speed or power-integrated designs, but requires external ESD protection in harsh environments. | Choose MAX14841ESA+ only when system-level ESD design already includes TVS diodes and 16-Mbps throughput is mandatory. |
Compared with SN65HVD1420DR, THVD1420DR offers identical functionality with updated documentation and lifecycle support; versus MAX14841ESA+, THVD1420DR trades speed and integrated regulation for smaller size, lower cost, and superior built-in ESD robustness - making it optimal for space-constrained, high-reliability industrial nodes.
Availability
THVD1420DR is available at Aetrix Electronics and suitable for factory automation, grid infrastructure, and motor drive applications requiring stable component supply, long-term industrial qualification, and guaranteed traceable sourcing.
Supply support for THVD1420DR 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 solutions for industrial, automotive, and communications markets.
The THVD1420DR belongs to TI's robust RS-485 transceiver portfolio, engineered specifically for noise-immune, high-reliability industrial networking - emphasizing ESD resilience, wide temperature operation, and compact packaging for next-generation control systems.
FAQ
What is the maximum data rate supported by the THVD1420DR?
The THVD1420DR supports a maximum data rate of 12 Mbps under recommended operating conditions (VCC = 3.3–5.5 V, TA = –40°C to 125°C, RL = 54 Ω). This is confirmed in Section 5.4 (Recommended Operating Conditions) and Section 5.9 (Switching Characteristics) of the TI SLLSF78B datasheet. At this rate, THVD1420DR achieves driver propagation delay of 20–38 ns and rise/fall times of 15–25 ns - enabling reliable high-speed communication in motor control and automation networks.
Does the THVD1420DR require external ESD protection on the bus lines?
No, the THVD1420DR does not require external ESD protection on the A/B bus lines. Its bus pins are rated for ±12-kV IEC 61000-4-2 contact discharge, ±15-kV air-gap discharge, and ±4-kV IEC 61000-4-4 fast transient burst - as specified in Sections 5.2 and 5.3 of the TI SLLSF78B datasheet. This integrated protection eliminates TVS diodes in most industrial deployments, reducing BOM count and PCB area.
What is the unit load rating of the THVD1420DR, and how many nodes can it support?
The THVD1420DR has a 1/8 unit load (UL) rating, meaning each device presents only 1.5 kΩ of load to the RS-485 bus - eight times lighter than the standard 12-kΩ UL. As stated in Section 1 (Features) and Section 8.2.1.3 of the TI SLLSF78B datasheet, this allows up to 256 transceivers on a single terminated bus without signal degradation or termination mismatch issues.
How does the THVD1420DR behave during power-up or hot-plug events?
The THVD1420DR features glitch-free power-up/down behavior, as documented in Section 1 (Features) and Section 7.4 (Device Functional Modes) of the TI SLLSF78B datasheet. Internal pull-down on DE and pull-up on RE ensure the driver remains disabled and receiver enabled only upon valid logic assertion - preventing bus contention or false data transmission during voltage ramp-up or live insertion into powered systems.
Is the THVD1420DR pin-compatible with the THVD1400DR?
Yes, the THVD1420DR is pin-compatible and footprint-compatible with the THVD1400DR - both share identical 8-pin SOT (DRL) and SOIC (D) packages, identical pin configuration (A/B/DE/RE/D/R/VCC/GND), and identical logic-level interface behavior. The only functional difference is data rate: THVD1400DR supports up to 500 kbps, while THVD1420DR supports up to 12 Mbps. This allows drop-in speed upgrades in existing designs without layout changes.
THVD1420DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 12Mbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THVD1420DR FAQ
1.How can I place an order for THVD1420DR through Aetrix?
Please submit a Request for Quotation (RFQ) for THVD1420DR 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 THVD1420DR reliable?
The price and inventory of THVD1420DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THVD1420DR is usually 5 days.
3.What payment methods are accepted for THVD1420DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THVD1420DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THVD1420DR?
THVD1420DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THVD1420DR 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 THVD1420DR?
For technical support, including THVD1420DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THVD1420DR requirements.
6.How does Aetrix verify that THVD1420DR is sourced from the original manufacturer or authorized distributors?
All THVD1420DR 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 THVD1420DR meets industry standards.
7.What is the process for return or replacement of THVD1420DR?
All THVD1420DR units undergo pre-shipment inspection (PSI). If there is an issue with THVD1420DR, 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 THVD1420DR part is unused and in its original packaging.
Return procedure for THVD1420DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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