THVD1449VDR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments THVD1449VDR is a 12 Mbps RS-485/RS-422 transceiver with integrated 4 kV IEC surge protection and wide IO supply range of 1.65 V to 5.5 V. It features a differential Schmitt-trigger receiver input and EIA-485-A/TIA-485-A compliance in an 8-pin SOIC package. Available from stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- THVD1449VDR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.6744(MOQ 63)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated 4 kV IEC 61000-4-5 surge protection eliminates the need for external TVS diodes on RS-485 lines
- Wide IO supply voltage range of 1.65 V to 5.5 V enables direct interfacing from 1.8 V MCUs to legacy 5 V systems
- 12 Mbps data rate supports high-speed industrial fieldbus and multi-drop network topologies with up to 32 unit loads
Applications
The THVD1449VDR is ideal for industrial automation networks including Modbus RTU, Profibus, and BACnet MS/TP where RS-485 transceivers must survive electrical surge events on long cable runs. Its 1.65 V to 5.5 V IO compatibility allows seamless integration with modern low-voltage microcontrollers operating at 1.8 V or 3.3 V without level-shifting circuitry. The integrated surge protection and 8-pin SOIC form factor simplify board design for motor drives, PLCs, and building automation field devices.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | ALSO OPERATES AT 5V NOM |
| Differential Output | YES |
| Driver Number of Bits | 1 |
| High Level Input Current-Max | 0.000005A |
| Input Characteristics | DIFFERENTIAL SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-485-A; TIA-485-A |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Out Swing-Min | 1.5V |
| Output Characteristics | DIFFERENTIAL |
| Output Low Current-Max | 0.004A |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Receive Delay-Max | 110ns |
| Receiver Number of Bits | 1 |
| Supply Current-Max | 5mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3.3V |
| Supply Voltage1-Max | 5.5V |
| Supply Voltage1-Min | 3V |
| Supply Voltage1-Nom | 3.3V |
| Surface Mount | YES |
| Technology | BICMOS |
| Terminal Finish | Nickel/Palladium/Gold/Silver (Ni/Pd/Au/Ag) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 650ns |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What surge protection level is integrated into the THVD1449VDR and how does it simplify board design?
The THVD1449VDR integrates 4 kV IEC 61000-4-5 surge protection directly on the RS-485 bus pins, meeting the standard required for industrial field installations. This eliminates the need for external bidirectional TVS diodes typically rated at 3.3 V clamping, removing at least 2 discrete components per transceiver and saving significant PCB area in compact industrial node designs.
Can the THVD1449VDR connect a 1.8 V microcontroller directly to a 5 V RS-485 bus without a level shifter?
Yes. The THVD1449VDR IO supply pins accept voltages from 1.65 V to 5.5 V, so a 1.8 V MCU can power the IO section at 1.8 V while the RS-485 bus operates at 5 V logic levels. The differential Schmitt-trigger receiver input has hysteresis of at least 50 mV, ensuring clean digital output even with moderate bus noise, and no external level-translation IC is required.
How many devices can share an RS-485 network using THVD1449VDR, and what is the maximum cable length at 12 Mbps?
With a unit load of 1/8 standard load, a single THVD1449VDR driver can support up to 256 receivers on a single RS-485 segment. At the maximum 12 Mbps data rate, practical cable lengths are limited to approximately 10–15 meters due to cable capacitance; at lower rates such as 100 kbps, distances exceeding 1000 meters are achievable with 120 Ω termination resistors at each end.
For a Modbus RTU network in a factory floor controller, is THVD1449VDR a suitable replacement for the SN75176?
The THVD1449VDR is pin-compatible in the 8-pin SOIC footprint and exceeds the SN75176 on all key parameters: it provides 12 Mbps vs. 2.5 Mbps for the older device, adds 4 kV surge protection, and supports IO supply voltages down to 1.65 V vs. the SN75176's fixed 5 V logic. For Modbus RTU at 115200 bps, both parts operate well within their bandwidth limits, but THVD1449VDR offers substantially better surge immunity without additional external components.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 63+ | $3.1797 | $200.32 |
| 82+ | $3.0737 | $252.04 |
| 100+ | $2.8203 | $282.03 |
| 109+ | $2.7557 | $300.37 |
| 250+ | $2.6787 | $669.68 |
| 500+ | $2.6744 | $1337.22 |
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