TPT4181L1-DF8R

Drivers, Receivers, Transceivers Overview

The TPT4181L1-DF8R is a half-duplex RS-485 transceiver manufactured by 3PEAK, housed in a DFN3X3-10 package. It operates on a bus supply voltage (VCC) of 3.0 V to 5.5 V and features a separate logic I/O supply (VIO) ranging from 1.65 V to VCC. The device supports selectable data rates of 20 Mbps or 500 Kbps via an SLR pin. It provides ±18-kV HBM ESD protection and ±15-kV IEC61000-4-2 contact/air discharge protection on the A/B bus pins. Quiescent current varies by mode: at 20 Mbps, disabled states draw −2 µA to 2 µA; at 500 Kbps, disabled states draw −2 µA to 2 µA. Driver differential output voltage magnitude reaches up to 3.5 V into a 100 Ω load at 5.0 V.

Drivers, Receivers, Transceivers Feature Summary

• Flexible digital interface with independent 1.65-V to VCC logic supply for compatibility with low-voltage controllers
• Selectable transmission speed controlled by the SLR pin, supporting high-speed 20 Mbps or standard 500 Kbps operation
• Robust bus protection against electrostatic discharge events without latch-up, ensuring reliability in harsh environments
• Full fail-safe receiver design that guarantees a logic-high output when inputs are floating, shorted, or idle

Drivers, Receivers, Transceivers Applications

• Factory automation systems
• Field bus networks
• Industrial process control networks
• Communication infrastructure equipment

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix DF8R corresponds to the tape and reel quantity of 4000 units as documented in the manufacturer's order information table. Confirm the package marking T4181 matches physical inspection requirements. Ensure the green RoHS-compliant status aligns with environmental regulations applicable to your manufacturing region before finalizing procurement orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component when interfacing with microcontrollers requiring logic levels as low as 1.65 V while maintaining a 3.0 V to 5.5 V bus supply. Choose the 20 Mbps mode for high-throughput applications and 500 Kbps for noise-immune long-distance links. The DFN3X3-10 package is suitable for space-constrained PCB layouts requiring thermal grounding through the exposed pad.

Drivers, Receivers, Transceivers Part Context

This part belongs to the TPT4181 family of RS-485 transceivers characterized by integrated ESD protection and dual-rate capability. Unlike standard variants, it includes a dedicated VIO pin for isolated logic level translation. The family shares functional similarities with other 3PEAK RS-485 devices but distinguishes itself through the flexible I/O supply range and compact DFN packaging optimized for modern surface-mount assembly processes.

Drivers, Receivers, Transceivers Replacement Considerations

Direct replacements must support the DFN3X3-10 footprint and 1.65 V to 5.5 V operating ranges. Verify that substitute components offer comparable ±18-kV HBM protection and similar quiescent current specifications to maintain system power efficiency and signal integrity standards.

Drivers, Receivers, Transceivers FAQ

How is the data rate selected between 20 Mbps and 500 Kbps?

The data rate is controlled by the SLR (Slew Rate Select) input pin. Driving the SLR pin low selects the 20 Mbps mode, while driving it high selects the 500 Kbps mode. If the pin is left floating, the default output is 20 Mbps.

What is the function of the VIO pin?

The VIO pin serves as the logic supply for the digital I/O signals (R, RE, D, DE, and SLR). It allows the logic interface to operate independently from the bus supply, supporting voltages as low as 1.65 V up to VCC.

Does the device provide fail-safe behavior for the receiver?

Yes, the receiver features a full fail-safe design. If the Rx inputs are floating, shorted, or on a terminated but undriven bus, the receiver output ensures a logic-high state.