SN65HVD1176 - 40Mbps PROFIBUS RS-485 Transceiver | Texas Instruments
MPN: SN65HVD1176 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.92 | $1,920.00 |
SN65HVD1176 Overview
A PROFIBUS-compliant RS-485 transceiver is an interface IC that converts a single-ended TTL/CMOS logic signal from a UART, MCU, or ASIC into a balanced differential signal on a bus, and vice versa. RS-485 transceivers sit in the OSI physical layer between a microcontroller and the physical twisted-pair medium; PROFIBUS DP is a higher-level fieldbus protocol that uses the RS-485 physical layer at 12 Mbps. The SN65HVD1176 belongs to the hierarchy: RS-485 transceiver -> interface IC -> signal conditioning -> semiconductor. Compliance with EN 50170 (PROFIBUS) is a key differentiator from generic RS-485 parts.
Key features include signaling rates up to 40 Mbps (well above the 12 Mbps PROFIBUS DP requirement), 1/5 unit load allowing up to 160 nodes on a single bus, low bus capacitance of 10 pF maximum for clean edges at high data rates, and a differential output voltage that exceeds 2.1 V across a 54 ohm load for robust noise margin. Driver and receiver enable pins support half-duplex operation and configurable bus states (active, driver-disabled, receiver-disabled, shutdown).
The SN65HVD1176 uses a differential line driver with slew-rate-limited outputs to reduce EMI and reflections on improperly terminated buses. Internal fail-safe biasing on the receiver ensures a defined logic-high output when the bus is idle, open, or shorted - eliminating the need for external bias resistors. Wide operating supply range of 3.0V to 3.6V is compatible with 3.3V logic commonly used in industrial PLCs.
Typical applications include PROFIBUS DP nodes, factory automation PLC backplanes, industrial sensor networks, motor drive communication links, and building automation gateways. The wide common-mode range (-7V to +12V) tolerates ground potential differences between nodes in large installations.
A key design consideration is bus termination: PROFIBUS segments must be terminated with 220 ohm resistors at both ends (plus fail-safe bias) to suppress reflections at 12 Mbps. The device's low bus capacitance makes it well-suited to long stubs when used with proper termination.
This page synthesizes drop-in alternatives, design considerations, and selection guidance not found in the manufacturer datasheet - enabling faster part selection and PCB layout reuse.
Drop-in alternatives for SN65HVD1176 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN75HVD1176DR
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD1176DRG4
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD1176D
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX3087EESA
✅ Drop-In📋 Reference alternative (not in catalog)
ST485ECDR
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD1176 Specifications
| Product Type | RS-485 Transceiver (Half-Duplex) |
| Protocol Compliance | ANSI TIA/EIA-485-A, EN 50170 (PROFIBUS) |
| Number of Drivers/Receivers | 1/1 |
| Duplex Mode | Half-Duplex |
| Maximum Signaling Rate | 40 Mbps |
| Unit Load | 1/5 unit load (up to 160 nodes) |
| Maximum Bus Capacitance | 10 pF |
| Differential Output Voltage (54 ohm load) | Exceeds 2.1 V |
| Supply Voltage Range | 3.0 V to 3.6 V |
| Common-Mode Voltage Range | -7 V to +12 V |
| Operating Temperature Range | -40C to +85C |
| Package | 8-pin SOIC (D) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Receiver Fail-Safe | Yes (internal biasing) |
SN65HVD1176 Pin Configuration
| Pin 1 | RO — Receiver Output (logic-level output from bus) |
| Pin 2 | RE — Receiver Enable (active-low; high = receiver disabled) |
| Pin 3 | DE — Driver Enable (active-high; low = driver in high-Z) |
| Pin 4 | DI — Driver Input (TTL/CMOS logic input to bus) |
| Pin 5 | GND — Ground |
| Pin 6 | A/Y — Non-inverting differential bus pin |
| Pin 7 | B/Z — Inverting differential bus pin |
| Pin 8 | VCC — 3.3V supply voltage (3.0V to 3.6V range) |
Typical Applications
SN65HVD1176 is suitable for 6 applications: PROFIBUS DP Communication Nodes, Industrial PLC Backplane Communication, Motor Drive and Servo Feedback Links, Building Automation Gateways, Energy Metering and Smart Grid Concentrators, Industrial Sensor Networks.
PROFIBUS DP Communication Nodes
The SN65HVD1176 is purpose-built for PROFIBUS DP networks requiring 12 Mbps operation over RS-485 twisted-pair cable segments. Its EN 50170 compliance guarantees interoperability with standard PROFIBUS masters and slaves, while the 40 Mbps maximum signaling rate provides substantial headroom above the protocol requirement. The 1/5 unit load allows up to 160 nodes per segment - far exceeding standard 32-node RS-485 - enabling large distributed I/O systems. Internal receiver fail-safe biasing eliminates the external resistor network typically required for idle-bus definition. Place the device between a 3.3V MCU UART and the bus connector with proper 220 ohm termination at each segment end. Compared to slower 10 Mbps PROFIBUS parts, the SN65HVD1176's 40 Mbps ceiling allows it to also serve in proprietary high-speed fieldbus designs.
Recommended
Industrial PLC Backplane Communication
Factory automation PLCs use multi-drop RS-485 backplanes to interconnect I/O modules, motor drives, and remote sensors - a core application for the SN65HVD1176. The -40C to +85C industrial temperature range tolerates cabinet ambient conditions; the -7V to +12V common-mode range accommodates ground potential differences between large machines. The 10 pF maximum bus capacitance preserves signal integrity on backplane traces and short cable stubs. Slew-rate-limited driver outputs reduce EMI emissions, simplifying CE/UL compliance of the overall PLC system. The half-duplex architecture is ideal for shared bus topologies where modules arbitrate via the driver-enable (DE) and receiver-enable (RE) pins. Engineers typically pair this transceiver with a 3.3V MCU UART running Modbus RTU or PROFIBUS protocols. Compared to isolated transceiver solutions, the SN65HVD1176 keeps BOM cost low for non-isolated backplane segments.
Recommended
Motor Drive and Servo Feedback Links
Variable-frequency motor drives and servo amplifiers require high-speed, noise-immune communication between the drive and central controller - a perfect fit for the SN65HVD1176. The 40 Mbps signaling rate supports fast position feedback and torque command updates, while differential signaling rejects the common-mode noise generated by PWM switching at the drive's power stage. The -7V to +12V common-mode range tolerates ground bounce in the drive's noisy environment. The wide 3.0V-3.6V supply range is compatible with 3.3V logic commonly used in modern DSP-based motor controllers. Internal fail-safe biasing ensures clean bus-idle detection when drives are powered down individually. Compared to opto-isolated feedback links, the SN65HVD1176 reduces cost and latency at the expense of no galvanic isolation - acceptable for drives with grounded chassis.
Recommended
Building Automation Gateways
Building automation systems use RS-485 networks for HVAC controllers, lighting ballasts, and access control panels; the SN65HVD1176 provides a high-performance interface for these segments. Its 1/5 unit load allows up to 160 controllers on a single trunk - sufficient for large commercial buildings with hundreds of zones. The low 10 pF bus capacitance keeps signal integrity intact across long cable runs in cable trays and conduit. PROFIBUS compliance is a bonus for European installations where building automation often integrates with industrial PROFIBUS backbones. The 3.3V supply is convenient for gateways powered from low-voltage rails. Compared to 5V-only RS-485 transceivers, the SN65HVD1176 saves power in battery-backed building controllers during power outage events.
Recommended
Energy Metering and Smart Grid Concentrators
Smart electricity meters, gas meters, and water meters in AMI (Advanced Metering Infrastructure) networks often use RS-485 multi-drop wiring to a concentrator unit. The SN65HVD1176's 1/5 unit load supports hundreds of meters per segment, while its 40 Mbps rate allows future migration to higher-bandwidth protocols. The wide common-mode range handles ground potential differences across long distribution feeders. Industrial temperature rating suits outdoor cabinet installations. Internal fail-safe biasing prevents false alarms during meter maintenance when individual nodes are disconnected. Compared to RS-232 or wireless metering links, RS-485 with the SN65HVD1176 provides reliable, interference-immune communication at lower infrastructure cost. The low bus capacitance enables long cable runs to remote meter locations.
Recommended
Industrial Sensor Networks
Distributed temperature, pressure, flow, and level sensors in process plants connect to a central controller over RS-485 - a textbook application for the SN65HVD1176. With 1/5 unit load, the part supports up to 160 sensors per segment, enabling comprehensive plant-wide monitoring without extra repeaters. Slew-rate-limited driver outputs minimize EMI on sensor cables routed near power wiring, easing installation. The -40C to +85C industrial temperature rating handles the extremes of outdoor and process-area installations. Differential signaling rejects the common-mode noise from VFDs and large motors. Compared to 4-20mA current-loop sensor wiring, multi-drop RS-485 with the SN65HVD1176 dramatically reduces cable count and installation cost. Engineers should add 220 ohm termination at both segment ends and verify common-mode grounding.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD1176 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN75HVD1176DR | SN65HVD1176DRG4 | MAX3087EESA | ST485ECDR |
|---|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices (Maxim) | STMicroelectronics |
| Maximum Data Rate | 40 Mbps | 40 Mbps | 40 Mbps | 10 Mbps | 5 Mbps |
| Unit Load | 1/5 (160 nodes) | 1/5 (160 nodes) | 1/5 (160 nodes) | 1/8 (256 nodes) | 1/4 (128 nodes) |
| PROFIBUS Compliance | Yes (EN 50170) | Yes (EN 50170) | Yes (EN 50170) | Yes | Yes |
| Supply Voltage | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 4.75V to 5.25V | 4.75V to 5.25V |
| Operating Temperature | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C |
| Common-Mode Range | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V |
| 1-Piece Price (approx) | $3.20 | $2.85 | $3.20 | $4.10 | $1.95 |
Key Differentiators
- EN 50170 PROFIBUS compliance (vs MAX3087EESA)
- 1/5 unit load allows 160-node buses (vs ST485ECDR)
- 40 Mbps maximum signaling rate (vs MAX3087EESA)
Design Notes
Place the SN65HVD1176 as close as possible to the bus connector to minimize stub length. Keep the A/Y and B/Z traces matched in length and impedance (typically 100 ohm differential). Use a 4-layer PCB with a continuous ground plane beneath the bus traces to provide controlled impedance and return path. Decouple VCC with a 0.1 uF ceramic capacitor placed within 3 mm of pin 8, plus a 10 uF bulk capacitor nearby. Avoid routing bus traces near noisy switching nodes such as DC-DC converters or motor drive stages.
Terminate each end of the PROFIBUS segment with a 220 ohm resistor across A/Y and B/Z (plus optional fail-safe bias resistors if not provided by transceivers). For long segments, use 150 ohm termination to reduce reflections. Verify that stub lengths from the main bus to each node do not exceed 1/10 of the driver's rise time at the maximum data rate. The SN65HVD1176's low 10 pF bus capacitance helps maintain signal integrity, but cable capacitance accumulates - budget total bus capacitance below 50 pF per segment for clean 40 Mbps operation.
Do not exceed the absolute maximum common-mode voltage of -9V to +14V (transient). When interfacing to 5V logic, ensure the DI/RO logic levels are within the 3.3V-compatible thresholds of the SN65HVD1176; use level shifters if needed. Avoid tying DE and RE together in noisy environments - separate control allows the MCU to disable both driver and receiver for true low-power shutdown. Do not leave bus pins floating - the internal fail-safe bias handles this, but PCB-level EMI pickup can still cause false edges during long cable runs.
Keep the DE, RE, DI, and RO digital traces away from the differential A/Y and B/Z traces to minimize coupling. If the application uses a 3.3V MCU on the same PCB, route the digital traces perpendicular to bus traces. Use guard traces or ground stitching vias around the bus connector footprint to contain radiated emissions. For PROFIBUS DP certification, ensure the bus connector shield is bonded to chassis ground at a single point, separate from the digital ground.
Compliance Information
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified - not intended for automotive under-hood applications. Lead-free and halogen-free per TI datasheet specifications.