TPT7481-SOBR

TPT7481 is a 3.0V~5.5V isolated RS485 transceiver with ±15-kV IEC61000 ESD protection, compliant with RS-485 and RS-422 half-duplex communication standards. TPT7482 is an isolated full-duplex RS485 transceiver. This series features a failsafe receiver that ensures a logic-high output when the receiver's differential inputs (bus pins A/B) are open, shorted, or idle. The series transmitter delivers excellent differential output voltage across the 54-Ω load required by the RS-485 standard. This 20-Mbps device draws extremely low bus current and presents a true 1/8 unit load on the RS-485 bus, allowing up to 256 transceivers to be connected on a network without repeaters. The receiver inputs feature a "full failsafe" design, ensuring a logic-high receiver output when the inputs are floating, shorted, or on a terminated but undriven bus. The TPT748x is available in a WSOP16 package and operates over a temperature range of -40°C to +125°C.

Applications

• Motor drive
• Communication infrastructure

Key features

• Exceeds EIA-485 standard requirements
• Hot-plug circuit — Tx and Rx outputs remain tri-state during power-up/power-down
• Supply voltage: 3.0V~5.5V
• Data rate: 20-Mbps isolated RS485
• Full fail-safe receiver (open, short, terminated)
• 5-kV RMS isolation rating
• Typical static CMTI ±200-kV/μs, typical dynamic CMTI ±150-kV/μs
• Latch-up performance exceeds 600 mA
• Bus pin protection (between bus pins and GNDB)
• ±15-kV IEC 61000-4-2 contact discharge
• ±20-kV IEC 61000-4-2 air discharge
• Safety-related certifications: VDE certification per DIN VDE V 0884-17 (IEC60747-17), 5000-V_RMS isolation rating per UL 1577, CQC certification per GB 4943.1, and CSA, TUV, and CB certifications