Texas Instruments SN75176BPSG4

Overview

SN75176BPSG4 from Texas Instruments is a half-duplex RS-485/RS-422 differential bus transceiver in an 8-pin SOP (PS) package, operating from a single 5V supply. It features ±200mV receiver input sensitivity, 12kΩ minimum receiver input impedance, and ±60mA driver output capability. Designed for multipoint industrial bus communication in noisy environments, it supports up to 32 nodes on a single bus line.

For engineers reviewing the SN75176BPSG4 datasheet, SN75176BPSG4 pinout, SN75176BPSG4 application, or SN75176BPSG4 equivalent, key selection criteria include its 0°C to 70°C industrial temperature range, active-high driver enable (DE), active-low receiver enable (RE), thermal shutdown protection at ~150°C, and compliance with TIA/EIA-485-A and TIA/EIA-422-B standards.

Technical Context

The SN75176BPSG4 integrates a 3-state differential line driver and a differential line receiver sharing common A/B bus terminals. Its driver uses positive/negative current limiting and thermal shutdown for fault protection, while the receiver delivers 50mV typical input hysteresis and operates across –7V to +12V common-mode bus voltage range.

It supports bidirectional party-line communication via external connection of DE and RE pins for direction control. The device maintains high-impedance bus termination when unpowered or disabled, minimizing loading on long transmission lines up to 10 Mbps over CAT-5E cable.

Key Specifications

Pinout & Package

SN75176BPSG4 is housed in an 8-pin SOP (PS) package measuring 6.20mm × 5.30mm, optimized for surface-mount assembly and board space efficiency in industrial control modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RS-485 transceiver applications.

Compared with SN65176BPSG4, SN65176BPSR offers extended thermal resilience without design changes, while MAX485CPA+ trades robustness for cost and simplicity-making SN75176BPSG4 optimal for industrial RS-485 networks requiring reliability, fault tolerance, and 32-node scalability.

Availability

SN75176BPSG4 is available at Aetrix Electronics and suitable for industrial automation, building management systems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN75176BPSG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.

SN75176BPSG4 belongs to TI's legacy RS-485 transceiver portfolio, engineered specifically for noise-immune, multi-drop industrial communications in factory automation, process control, and infrastructure monitoring systems.

FAQ

What is the operating temperature range of the SN75176BPSG4?

The SN75176BPSG4 is rated for operation from 0°C to 70°C ambient temperature. This industrial-grade range supports deployment in controlled indoor environments such as PLC cabinets, HVAC controllers, and digital signage enclosures. It does not support extended temperature operation like the SN65176B variant, which functions from –40°C to 105°C. Always verify ambient and junction temperature margins in final PCB layout using the device's RθJA of 113.2°C/W.

How does the SN75176BPSG4 handle bus contention or short-circuit conditions?

The SN75176BPSG4 incorporates dual protection mechanisms: driver output current limiting (both positive and negative) and thermal shutdown triggered at approximately 150°C junction temperature. During bus contention or short-to-rail events, current limiting restricts output to ±60mA, preventing latch-up or permanent damage. If sustained fault conditions raise die temperature beyond threshold, thermal shutdown disables the driver until cooling occurs. These features make SN75176BPSG4 suitable for unattended industrial installations.

Can the SN75176BPSG4 be used in full-duplex RS-422 configurations?

No, the SN75176BPSG4 is a half-duplex transceiver with shared A/B bus terminals and a single directional control scheme via DE/RE pins. It lacks separate transmit and receive differential pairs required for true full-duplex RS-422. For full-duplex operation, TI recommends alternatives such as the SN65LBC179 or SN75LBC184, which provide independent driver and receiver ports. Attempting full-duplex use with SN75176BPSG4 will result in signal corruption due to simultaneous transmit/receive on the same bus lines.

What is the maximum data rate supported by the SN75176BPSG4?

The SN75176BPSG4 supports data rates up to 10 Mbps under typical conditions (e.g., 100 ft CAT-5E cable with 120Ω termination). Its receiver propagation delay of 21–35 ns and driver transition time of 20–30 ns provide sufficient timing margin for this rate. Actual achievable speed depends on cable length, stub length, termination quality, and noise environment. For reliable operation above 1 Mbps, keep stub lengths under 12 inches and use proper twisted-pair shielding and grounding practices.

Does the SN75176BPSG4 require external fail-safe biasing?

Yes, the SN75176BPSG4 does not include internal fail-safe biasing. When the A/B bus lines are open or floating, the receiver output becomes undefined. To ensure a known logic state (typically high) under idle or fault conditions, external biasing resistors must be added: a pull-up resistor from A to VCC and a pull-down resistor from B to GND, sized to develop ≥200mV differential voltage (e.g., 1.2kΩ and 1.0kΩ). This prevents spurious communication errors in multi-drop networks with intermittent node connectivity.