THVD1449DR

The THVD14x9(V) devices are half-duplex RS-485 transceivers with integrated surge protection. Surge protection is achieved by integrating TVS diodes within the standard 8-pin SOIC(D) package. This feature improves reliability and provides better immunity against noise transients coupled to data cables without requiring external protection components. The THVD1439 and THVD1449 operate from a 3.3V or 5V supply. The THVD1439V and THVD1449V devices support an additional V₁₀ supply, enabling IO operation at supply levels as low as 1.65V. This device family features a wide common-mode voltage range, making it suitable for multipoint applications over long cables. The THVD14x9(V) devices are half-duplex RS-485 transceivers with surge protection, available in two speed grades for data rates up to 250kbps and 12Mbps respectively. Surge protection is achieved by integrating TVS diodes within the standard 8-pin SOIC(D) package. The THVD1439 and THVD1449 devices feature an active-high driver enable and an active-low receiver enable. Disabling both the driver and receiver yields a standby current below 1.5μA (Vcc = 3.6V). The THVD1439V and THVD1449V have a single enable/disable pin that activates either the driver or the receiver at a time.

Applications

• Wireless infrastructure
• Factory automation
• Motor drives
• Building automation
• HVAC
• Grid infrastructure

Key features

• Meets or exceeds TIA/EIA-485A standard requirements
• 3V to 5.5V supply voltage V₁₀ supports 1.65V to Vcc logic levels (THVD1439V, THVD1449V)
• Bus I/O protection
• ±4kV IEC 61000-4-5 1.2/50μs surge
• ±15kV IEC 61000-4-2 contact discharge
• ±15kV IEC 61000-4-2 air-gap discharge
• ±4kV IEC 61000-4-4 electrical fast transient
• ±15kV HBM ESD
• ±15V DC bus fault
• Two speed grades available
• THVD1439, THVD1439V: 250kbps
• THVD1449, THVD1449V: 12Mbps
• Operating temperature range: -40°C to 125°C extended-grade operation
• Common-mode range: ±12V
• Enhanced receiver hysteresis for noise suppression
• Low power consumption
• Standby supply current: <3μA
• Operating current: <5mA
• Glitch-free power-up/power-down for hot-swap capability
• Open, short, and idle bus failsafe protection
• 1/8 unit load (up to 256 bus nodes)
• Industry-standard 8-pin SOIC package for drop-in compatibility