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Texas Instruments SN65LBC176DR
- Part No.:
- SN65LBC176DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65LBC176DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,906
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Product details
Overview
SN65LBC176DR from Texas Instruments is a half-duplex RS-485 differential bus transceiver in SOIC-8 package, operating from a single 5-V supply with −40°C to +85°C temperature range. It delivers 1.5 V minimum differential output voltage into 54 Ω, 50 mV typical receiver hysteresis, and ≤200 µA disabled supply current - enabling robust multi-drop industrial communication over long cables in noisy environments.
For engineers reviewing the SN65LBC176DR datasheet, SN65LBC176DR pinout, SN65LBC176DR application, or SN65LBC176DR equivalent, this page provides verified electrical parameters, functional mode behavior, thermal performance data, failsafe receiver design details, and validated alternative parts for RS-485 system design and component replacement.
Technical Context
The SN65LBC176DR integrates a 3-state differential line driver and a differential input line receiver on a single LinBiCMOS™ die. Its driver features positive/negative current limiting and thermal shutdown; the receiver includes open-circuit failsafe biasing and ±200 mV input sensitivity with 50 mV hysteresis.
Direction control is implemented via separate active-high driver enable (DE) and active-low receiver enable (RE) pins, which may be externally tied together. The A/B bus terminals support wide common-mode voltage range (−7 V to +12 V), ensuring interoperability across party-line RS-485 networks under ground potential differences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation with standard 5-V rail tolerances and low dropout regulator compatibility. |
| Differential Output Voltage | ≥1.5 V into 54 Ω - meets TIA/EIA-485-A minimum VOD requirement for reliable signal integrity at 10 Mbps. |
| Receiver Input Sensitivity | ±200 mV max - guarantees valid logic detection even with attenuated or noisy differential signals on long bus lines. |
| Receiver Hysteresis | 50 mV typ - suppresses chatter during slow-rising/falling edge transitions in electrically noisy factory environments. |
| Disabled Supply Current | ≤200 µA - enables ultra-low-power sleep modes in battery-backed or energy-conscious remote nodes. |
| Bus Terminal Voltage Range | −7 V to +12 V - supports fault tolerance against transient surges and ground-loop offsets in industrial wiring. |
| Propagation Delay (Driver) | 8 ns min / 31 ns max - enables timing-critical high-speed serial links up to 10 Mbps with predictable skew. |
Pinout & Package
SN65LBC176DR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish (Level-1 moisture sensitivity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D | Logic input (driver data) | Accepts TTL/CMOS-level serial data; drives differential A/B outputs when DE = high. |
| RE | Active-low receiver enable | Disables R output (high-Z) when high; enables differential-to-single-ended conversion when low. |
| DE | Active-high driver enable | Enables A/B differential driver output when high; places A/B in high-impedance state when low. |
| R | Logic output (receiver data) | Single-ended TTL/CMOS-compatible output reflecting differential bus state (A–B polarity). |
| GND | Power ground reference | Common return path for internal circuitry; must be connected to system ground plane with low impedance. |
| A | Differential bus non-inverting terminal | RS-485 bus connection point; carries positive polarity of differential pair; referenced to B. |
| B | Differential bus inverting terminal | RS-485 bus connection point; carries negative polarity of differential pair; referenced to A. |
| VCC | Positive supply input | 5-V power rail; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| RS-485 Compliance | Fully meets ANSI TIA/EIA-485-A and ISO 8482:1987(E) electrical requirements across full operating temperature range. |
| Failsafe Receiver | Open-circuit input defaults R output to logic high - prevents undefined states when bus is disconnected or unterminated. |
| Thermal Shutdown | Automatically disables driver during overtemperature events (>140°C junction), preventing latch-up or permanent damage. |
| Low Skew Performance | ≤6 ns pulse skew between rising/falling edges - maintains signal integrity in synchronous multi-node polling systems. |
| Glitch-Free Power Sequencing | No false pulses on R or A/B during power-up/down - eliminates spurious bus activity during system reset or brownout. |
Applications
| Industrial PLC Networks | Building Automation Systems |
|---|---|
|
Use Scenario: Multi-drop Modbus RTU communication between programmable logic controllers, I/O modules, and HMIs across factory floors with >100 m cable runs and EMI from motors/VFDs. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver managing bidirectional serial data framing and bus arbitration at up to 115.2 kbps. Use Value: Wide common-mode range (−7 V to +12 V) and 50 mV hysteresis ensure error-free reception despite ground potential shifts and conducted noise. |
Use Scenario: Centralized HVAC controller communicating with distributed thermostats, valve actuators, and CO₂ sensors over twisted-pair cabling in commercial buildings. IC Role / Device Role / Timing Role: Robust physical layer interface converting UART signals to differential RS-485 for noise-immune long-haul transmission. Use Value: ≤200 µA disabled supply current enables always-on monitoring nodes powered by energy-harvesting or coin-cell sources. |
| Energy Metering Infrastructure | Transportation Control Nodes |
|
Use Scenario: Smart electricity meters transmitting consumption data to concentrators via RS-485 subnetworks in utility substations with high ESD and surge exposure. IC Role / Device Role / Timing Role: Fault-tolerant bus interface providing driver current limiting, thermal protection, and bus short-circuit resilience. Use Value: Driver current limiting and thermal shutdown prevent latch-up during lightning-induced bus faults or accidental shorts. |
Use Scenario: Onboard train subsystems (door controls, lighting, PIS) exchanging status and command data across carriages using daisy-chained RS-485 links. IC Role / Device Role / Timing Role: High-reliability transceiver supporting extended temperature operation (−40°C to +85°C) and vibration-resistant SOIC packaging. Use Value: Guaranteed operation across full automotive-grade ambient range without derating - critical for unheated underfloor compartments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65HVD1786DR | Higher ESD rating (±16 kV HBM), integrated 120-Ω termination resistor, lower quiescent current (120 µA), but no thermal shutdown. | Better suited for portable or space-constrained designs where board area and ESD robustness are prioritized over fault recovery. | Select SN65HVD1786DR when external termination is undesirable and system-level ESD testing exceeds ±8 kV. |
| MAX13487EESA+ | Auto-direction sensing (no DE/RE control required), same SOIC-8 package, 1/8-unit load, but higher VOD (2.3 V min) and narrower temp range (−40°C to +105°C). | Ideal for UART-to-RS-485 bridge applications where microcontroller GPIO count is limited or direction control logic is absent. | Choose MAX13487EESA+ when simplifying firmware control flow and reducing external logic components outweighs need for thermal protection. |
Compared with SN65LBC176DR, SN65HVD1786DR offers superior ESD immunity and integrated termination at the cost of missing thermal shutdown, while MAX13487EESA+ eliminates direction-control wiring but trades off fault-protection depth for ease of integration in microcontroller-constrained systems.
Availability
SN65LBC176DR is available at Aetrix Electronics and suitable for industrial PLC networks, building automation systems, energy metering infrastructure, and transportation control nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN65LBC176DR 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 for industrial, automotive, and communications markets.
The SN65LBC176DR belongs to TI's legacy RS-485 transceiver portfolio, engineered specifically for rugged, high-noise industrial data networks requiring fail-safe operation, thermal resilience, and strict compliance with TIA/EIA-485-A standards.
FAQ
What is the maximum data rate supported by the SN65LBC176DR?
The SN65LBC176DR supports data rates up to 10 Mbps under typical conditions (54 Ω load, 5 V supply, 25°C). Its 8 ns minimum differential output delay and ≤12 ns transition time enable reliable high-speed operation, though actual achievable rate depends on bus length, termination, and noise environment. For 1200 m cable runs, 115.2 kbps is recommended per TIA/EIA-485-A guidelines.
Does the SN65LBC176DR include built-in termination resistors?
No, the SN65LBC176DR does not integrate termination resistors. External 120-Ω resistors must be placed across the A and B bus lines at the farthest node(s) to prevent signal reflections. This discrete approach allows flexible network topology design and avoids fixed termination mismatches in multi-drop configurations where only two endpoints require termination.
How does the failsafe feature of the SN65LBC176DR operate?
The SN65LBC176DR implements open-circuit failsafe biasing: when the A and B inputs are disconnected or floating, internal circuitry forces the R output to a logic-high state. This prevents undefined or metastable receiver output during bus disconnection, hot-plug events, or broken-wire faults - ensuring deterministic system behavior without external biasing networks.
Can the SN65LBC176DR be used in full-duplex RS-485 configurations?
No, the SN65LBC176DR is strictly a half-duplex transceiver. It shares the same A/B bus terminals for both driver output and receiver input, with direction controlled by the DE and RE pins. Full-duplex operation requires separate transmit (TX) and receive (RX) differential pairs, such as those found in devices like the SN65LBC182 or THVD1550.
What thermal protection mechanisms are implemented in the SN65LBC176DR?
The SN65LBC176DR incorporates thermal shutdown circuitry that disables the driver when junction temperature exceeds approximately 140°C. Once temperature falls below the hysteresis threshold (~125°C), normal operation resumes automatically. This protects against sustained overloads, short circuits, or inadequate heatsinking - preserving reliability in enclosed or high-ambient industrial enclosures.
SN65LBC176DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 50 mV
- Data Rate:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN65LBC176DR FAQ
1.How can I place an order for SN65LBC176DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65LBC176DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN65LBC176DR reliable?
The price and inventory of SN65LBC176DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65LBC176DR is usually 5 days.
3.What payment methods are accepted for SN65LBC176DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65LBC176DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65LBC176DR?
SN65LBC176DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65LBC176DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN65LBC176DR?
For technical support, including SN65LBC176DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65LBC176DR requirements.
6.How does Aetrix verify that SN65LBC176DR is sourced from the original manufacturer or authorized distributors?
All SN65LBC176DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN65LBC176DR meets industry standards.
7.What is the process for return or replacement of SN65LBC176DR?
All SN65LBC176DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65LBC176DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN65LBC176DR part is unused and in its original packaging.
Return procedure for SN65LBC176DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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