SN75HVD1176 - 40Mbps PROFIBUS RS-485 Transceiver | Texas Instruments
Teilenummer: SN75HVD1176 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.84 | $184,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.41 | $1.410,00 |
SN75HVD1176 Übersicht
An RS-485 transceiver is a physical-layer interface IC that converts a single-ended TTL/CMOS logic signal into a robust differential voltage on a twisted-pair bus, and vice versa. RS-485 belongs to the EIA/TIA-485 standard family and is widely used in industrial multipoint networks because it supports long cable runs, high noise immunity, and multiple node addresses. PROFIBUS (Process Field Bus, IEC 61158/EN 50170) is an industrial fieldbus protocol that imposes tighter symmetry, rise/fall time, and voltage-swing requirements on the transceiver than generic RS-485. SN75HVD1176 targets that PROFIBUS envelope while remaining backward-compatible to RS-485, sitting in the hierarchy: PROFIBUS transceiver -> RS-485 transceiver -> differential line transceiver -> physical-layer IC -> wired communication IC -> semiconductor.
Key features include signaling rates up to 40 Mbps, 1/5 unit load (up to 160 nodes), low bus capacitance of 10 pF maximum, thermal shutdown protection, short-circuit-protected bus pins, and an industrial -40C to +85C operating temperature range. The differential output voltage exceeds 2.1V into a 54 ohm load, comfortably meeting the PROFIBUS VOD minimum while leaving margin for cable loss. Driver enable (DE) and receiver enable (RE) pins support direction control and half-duplex arbitration.
The device uses a bipolar CMOS-DMOS process that integrates ESD cells, bus-tap protection, and a precision differential comparator on the receive path. Internal fail-safe biasing forces a deterministic logic-high on R when the bus is idle, shorted, or open, eliminating the need for external fail-safe resistors on most networks. The 10 pF maximum bus pin capacitance helps maintain signal integrity at 40 Mbps on long stubs and many-node buses.
Typical applications include PROFIBUS-DP master and slave nodes, RS-485 industrial backbones, factory-floor PLC I/O expansion, motor-drive isolated communication channels, building automation networks, and any 5V industrial multipoint data link that must interoperate with PROFIBUS DP/PA gateways or legacy RS-485 masters.
When designing with this part, place a 100 nF decoupling capacitor within 2 mm of VCC and provide a low-impedance ground return for bus-pin ESD currents. Maintain 100 ohm characteristic-impedance twisted pair and use fail-safe biasing only when the standard internal biasing does not meet the application idle-state requirement.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including same-brand family alternatives and cross-brand pin-compatible equivalents verified against the TI datasheet.
Drop-in-Alternativen für SN75HVD1176 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SN65HVD1176D
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN65HVD1176DR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN75HVD1176DR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX3088ESA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ISL3179EIBZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN75HVD1176 Technische Daten
| Protocol | RS-422, RS-485, PROFIBUS |
| Funktion | Transceiver |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Data Rate (signaling rate) | 40 Mbps (max) |
| Bus Pin Capacitance | 10 pF (max) |
| Unit Load | 1/5 unit load (up to 160 nodes) |
| Differential Output Voltage | >2.1 V into 54 ohm load |
| Betriebstemperatur | -40C to +85C |
| Gehäuse | 8-SOIC |
| Montageart | Surface Mount |
| Fail-safe (idle/open/short bus) | Yes (internal biasing) |
| Thermisches Abschalten | Yes |
| RoHS-Status | Compliant |
SN75HVD1176 Pin-Konfiguration
| Pin 1 | RO — Receiver output (logic level referenced to VCC/GND) |
| Pin 2 | RE — Receiver enable (active low; tie to GND to enable, drive high to put RO in high-Z) |
| Pin 3 | DE — Driver enable (high = driver enabled, driver in high-Z when low) |
| Pin 4 | DI — Driver input (TTL/CMOS logic) |
| Pin 5 | GND — Ground reference for logic and bus |
| Pin 6 | A — Non-inverting differential bus line |
| Pin 7 | B — Inverting differential bus line |
| Pin 8 | VCC — 5V supply (decouple with 100 nF ceramic within 2 mm) |
Typische Anwendungen
SN75HVD1176 ist geeignet für 6 Anwendungs: PROFIBUS-DP Master / Slave Nodes, RS-485 Industrial Backbone Links, PLC and Industrial Controller I/O Expansion, Motor Drive Isolated Communication Channels, Building Automation Networks, Isolated PROFIBUS-DP Gateways.
PROFIBUS-DP Master / Slave Nodes
The SN75HVD1176 is purpose-built to satisfy EN 50170 PROFIBUS-DP signaling requirements, with differential output voltage exceeding 2.1V into a 54 ohm load and bus capacitance limited to 10 pF maximum per the TI SNx5HVD1176 datasheet. Its 40 Mbps signaling rate comfortably supports the 12 Mbps PROFIBUS-DP top speed while leaving margin for cable loss and stub reflections in factory-floor installations. The internal fail-safe biasing simplifies the BOM by removing external pull-up and pull-down resistors on the bus, which is important in industrial nodes where leakage paths can corrupt idle-state logic.
Empfohlen
RS-485 Industrial Backbone Links
For 5V multipoint RS-485 backbones carrying Modbus RTU, DMX512, or proprietary SCADA traffic, the SN75HVD1176's 1/5 unit load supports up to 160 nodes on a single twisted pair, well beyond the conventional RS-485 limit of 32 nodes (1 unit load each) per the TI datasheet. Its thermal shutdown and short-circuit-protected bus pins survive cable miswiring that is common during installation. Combined with internal fail-safe biasing, the part provides a robust physical layer that tolerates open, shorted, or idle bus conditions without external resistors, lowering the node BOM.
Empfohlen
PLC and Industrial Controller I/O Expansion
Programmable logic controllers and modular I/O racks use RS-485 backplanes to connect distributed slices over a single twisted pair; the SN75HVD1176's 40 Mbps rate and 1/5 unit load let a single PLC chassis drive many I/O cards without repeaters per the TI datasheet. The DE and RE pins allow direction control that maps cleanly to UART half-duplex transceivers, and the industrial -40C to +85C operating range covers unheated cabinet deployments. Hot-swap tolerant bus pins survive the field wiring mistakes that occur during maintenance.
Empfohlen
Motor Drive Isolated Communication Channels
Variable-frequency drives and servo amplifiers expose isolated RS-485 channels for parameter tuning, firmware updates, and real-time control loops. The SN75HVD1176's small 8-SOIC footprint simplifies placement near the isolation barrier, while its 40 Mbps signaling supports multi-Mbaud control loops that demand deterministic latency. According to the TI datasheet the bus pin capacitance is only 10 pF max, which minimizes the loading effect on long motor-cable stubs and reduces EMI coupling into the drive power stage. The differential output exceeding 2.1V at 54 ohm maintains SNR across the isolation barrier.
Empfohlen
Building Automation Networks
BACnet MS-TP, Modbus RTU, and proprietary HVAC bus systems typically run at 76.8 kbps to 1 Mbps over RS-485 twisted pair, where the SN75HVD1176's 40 Mbps ceiling provides enormous timing margin and its 1/5 unit load lets dense building-automation panels share one segment per the TI datasheet. The industrial temperature rating and bus-pin ESD protection handle rooftop equipment rooms and electrical closets where surge exposure is common. Internal fail-safe biasing reduces wiring errors during commissioning.
Empfohlen
Isolated PROFIBUS-DP Gateways
PROFIBUS-DP to Ethernet, EtherCAT, or PROFINET gateways require the physical-layer transceiver to meet EN 50170 symmetry and VOD requirements. The SN75HVD1176's 2.1V minimum VOD into 54 ohm and tightly controlled rise/fall times per the TI datasheet make it the standard TI recommendation for the gateway side. A 100 nF VCC decoupling capacitor and standard 100 ohm twisted pair with proper termination complete a PROFIBUS-compliant segment, with the part's 40 Mbps headroom accommodating future migration to PROFINET IRT bridges.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SN75HVD1176 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SN65HVD1176D | SN65HVD1176DR | SN75HVD1176DR | MAX3088ESA | ISL3179EIBZ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Renesas Electronics |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Data Rate | 40 Mbps | 40 Mbps | 40 Mbps | 40 Mbps | 10 Mbps (-75%) | 20 Mbps (-50%) |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| Unit Load | 1/5 (160 nodes) | 1/5 (160 nodes) | 1/5 (160 nodes) | 1/5 (160 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) |
| PROFIBUS / EN 50170 Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
| Bus Pin Capacitance (max) | 10 pF | 10 pF | 10 pF | 10 pF | 25 pF | 15 pF |
| Supply Voltage | 5 V (typical) | 5 V | 5 V | 5 V | 5 V | 3.3 V |
| Internal Fail-Safe Biasing | Yes | Yes | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Built-in PROFIBUS DP / EN 50170 compliance (vs. MAX3485)
- 40 Mbps headroom for future protocol migration (vs. MAX3088ESA)
- 5V supply matches legacy industrial 5V rails (vs. ISL3179EIBZ)
- 1/5 unit load supports denser networks (vs. Standard 1-unit-load RS-485)
Designhinweise
Place a 100 nF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 8) and tie GND (pin 5) directly to the ground plane with a short, wide trace. Keep the bus traces (A, B) matched in length and routed as a 100 ohm differential pair to maintain PROFIBUS signal integrity. The TI SNx5HVD1176 datasheet recommends terminating the bus with 100 ohm resistors at both ends for 40 Mbps operation, plus a series resistor of about 10-39 ohm at the bus pins if very long cable stubs are present.
Avoid tying RE (pin 2) directly to VCC: leaving the receiver enabled while the driver is also enabled creates a half-duplex loopback that corrupts incoming data. For half-duplex operation, drive DE high and RE low together (or use a GPIO that asserts both), or tie RE to GND and rely on UART direction control. Also remember that internal fail-safe biasing forces RO high only when the bus is truly idle; if a transmitter somewhere else is still active, RO will reflect the live bus state per the TI datasheet.
Estimated: at 40 Mbps with 10 pF bus capacitance and 1/5 unit load, the maximum PROFIBUS segment length is approximately 50-100 m before the signal loss budget is exceeded. Each node adds ~10 pF, so 32 nodes leave only 320 pF total before signal integrity degrades. Use lower-capacitance cabling and minimize stubs per the TI SNx5HVD1176 datasheet, and consider an SN65HVD1176 in place of an SN75 if you need the wider temperature envelope for outdoor cabinets.
At a worst-case bus-pin short to 5V or GND, the SN75HVD1176 enters thermal shutdown when the junction temperature exceeds ~150C per the TI datasheet. The 8-SOIC package dissipates approximately 0.4 W in normal traffic; ensure the board's ground plane is sized so that theta_JA stays below ~100 C/W. For long-cable high-bus-load installations, derate the part by lowering the data rate or reducing the number of nodes per segment.
Compliance-Informationen
RoHS and REACH compliance per TI product page; lead-free SOIC packaging. AEC-Q100 is not applicable since this is an interface IC, not an automotive-qualified analog/logic device.
