THVD1520 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The THVD1520 is a single-channel RS-485 transceiver from Texas Instruments supporting half-duplex data transmission at up to 250 kbps, with ±15 kV ESD protection on the bus pins and a 3.3 V to 5 V supply range. It integrates one driver and one receiver in an 8-pin SOIC package suitable for industrial fieldbus and building automation networks. Available in tape and reel for volume production across factory and process control applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- THVD1520 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Single-channel half-duplex RS-485 transceiver with ±15 kV HBM ESD protection on bus pins for robust industrial environments
- Supports 3.3 V and 5 V supply operation with data rates up to 250 kbps for standard RS-485 and RS-422 network compatibility
- 8-pin SOIC package with integrated driver and receiver simplifies board layout for space-constrained industrial communication nodes
Applications
The THVD1520 is used in industrial automation, building management systems, and HVAC control networks where RS-485 multi-drop communication over distances up to 1200 m is required. Its ±15 kV ESD protection on the A and B bus lines safeguards the transceiver from electrostatic discharge events common in field-installed wiring in factory environments. The 8-pin SOIC package and 3.3 V to 5 V supply compatibility make it a straightforward drop-in for PLC I/O modules, smart meters, and serial communication breakout boards.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What data rate and bus length does THVD1520 support for RS-485 industrial network designs?
The THVD1520 supports RS-485 data rates up to 250 kbps, which is the standard rate for Modbus RTU and many building automation protocols such as BACnet MS/TP. At this data rate, RS-485 networks can extend up to 1200 m with twisted-pair cable and 120-ohm termination resistors at each end of the bus. For shorter runs under 100 m, higher data rates may be achievable depending on cable quality and load conditions.
How does the ±15 kV ESD protection on THVD1520 benefit installations in electrically noisy industrial environments?
The THVD1520 provides ±15 kV Human Body Model ESD protection on the RS-485 A and B bus pins, significantly exceeding the ±2 kV minimum required by the RS-485 standard. This robust protection prevents damage from electrostatic discharge during cable installation and from voltage transients induced by motors, solenoids, or lightning events near industrial wiring. Compared to standard transceivers with only ±2 kV to ±8 kV protection, the THVD1520 reduces field failure rates in harsh environments.
Can THVD1520 operate at both 3.3 V and 5 V, and how does this affect interfacing with mixed-voltage microcontrollers?
Yes, THVD1520 operates from both 3.3 V and 5 V supply voltages, making it directly compatible with both legacy 5 V PIC and AVR microcontrollers and modern 3.3 V ARM Cortex-M devices without external level shifting. The logic-side I/O levels track the supply, so a 3.3 V MCU can drive the DE and DI pins directly while receiving RO output at 3.3 V logic levels. This dual-voltage support simplifies mixed-voltage board designs and reduces the number of interface components needed.
For a Modbus RTU network with 32 nodes, what is the THVD1520 bus-load unit and how many devices can share one segment?
The THVD1520 presents a standard 1/8 unit load on the RS-485 bus, meaning a single segment can support up to 256 devices while staying within the 32-unit-load limit specified by the RS-485 standard. In a typical Modbus RTU installation, this allows all 247 addressable slave nodes to share one physical bus segment without requiring repeaters, provided the cable length and 250 kbps data rate constraints are satisfied. Using 120-ohm line termination at both cable ends maintains signal integrity across all 32 to 256 connected nodes.
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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.
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