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Texas Instruments SN65LBC184DR
- Part No.:
- SN65LBC184DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65LBC184DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,233
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Product details
Overview
SN65LBC184DR from Texas Instruments is a half-duplex RS-485 differential transceiver with integrated transient voltage suppression, operating at 4.75–5.25 V supply, supporting up to 250 kbps data rate, featuring ±30 kV IEC 61000-4-2 ESD protection on bus pins A/B, and designed for industrial networks requiring robust noise immunity and fail-safe receiver operation.
For engineers reviewing the SN65LBC184DR datasheet, SN65LBC184DR pinout, SN65LBC184DR application, or SN65LBC184DR equivalent, key selection criteria include its 1/4-unit-load capability (128-node bus), open-circuit fail-safe receiver, thermal shutdown protection, slew-rate-controlled driver outputs for extended stub lengths, and compliance with TIA/EIA-485 and ISO/IEC 8482:1993(E) standards.
Technical Context
The SN65LBC184DR implements a half-duplex RS-485 interface with active-HIGH driver enable (DE) and active-LOW receiver enable (/RE), enabling flexible directional control modes including independent, combined, or receiver-always-on configurations. Its differential driver delivers ≥1.5 V differential output voltage into 54 Ω load with controlled slew rate to limit EMI and support unterminated cable runs.
The receiver incorporates input hysteresis (70 mV), failsafe high output on floating inputs, and thresholds of ±200 mV for VID, ensuring reliable logic-level interpretation under noisy common-mode conditions. Thermal shutdown activates at ~160°C junction temperature, and the device sustains 400 W peak surge per IEC 61000-4-5 without external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures compatibility with standard 5 V logic systems and stable operation across industrial temperature range. |
| Data Rate | 250 kbps - supports high-speed industrial communication over long cables in electrically noisy environments. |
| ESD Protection | ±30 kV contact & air discharge (IEC 61000-4-2) on A/B/GND - eliminates need for external TVS diodes in most field deployments. |
| Bus Loading | 1/4 unit load - allows up to 128 transceivers on a single RS-485 bus without signal integrity degradation. |
| Differential Output Voltage | ≥1.5 V into 54 Ω - meets RS-485 minimum driver output requirement for reliable detection by compliant receivers. |
| Receiver Input Thresholds | ±200 mV with 70 mV hysteresis - prevents chatter during slow-rising common-mode noise and enables stable decision margins. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial and outdoor embedded applications without derating. |
| Disabled Supply Current | ≤300 μA - minimizes power consumption in standby or sleep modes of battery-backed or energy-sensitive nodes. |
Pinout & Package
SN65LBC184DR is packaged in an SOIC-8 (D package), 4.9 mm × 6.0 mm body size with standard 1.27 mm pitch, suitable for automated PCB assembly and space-constrained industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R | Digital output | Receiver data output - drives MCU UART RX line; high-impedance when /RE = HIGH. |
| RE | Digital input | Active-LOW receiver enable - ties to GND for always-on receive mode; critical for bus monitoring during transmit silence. |
| DE | Digital input | Active-HIGH driver enable - synchronized with UART TX to avoid bus contention; enables half-duplex direction control. |
| D | Digital input | Driver data input - connects directly to MCU UART TX; logic level determines polarity of A/B differential output. |
| GND | Reference potential | Local ground reference - must be connected to system ground plane with low-inductance path to minimize noise coupling. |
| B | Bus I/O | Complementary bus terminal - paired with A to form differential RS-485 bus pair; requires twisted-pair routing and termination. |
| A | Bus I/O | Complementary bus terminal - defines bus polarity (A > B = logic HIGH); matched impedance trace routing essential. |
| VCC | Supply | +5 V power rail - requires local 100 nF ceramic bypass capacitor placed within 2 mm of pin to suppress high-frequency transients. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated transient voltage suppression | Withstands 400 W peak surge per IEC 61000-4-5 without external components - reduces BOM count and PCB area in utility meter and motor drive designs. |
| Open-circuit fail-safe receiver | Outputs HIGH when A/B are disconnected or floating - prevents undefined logic states and false interrupts in multi-drop bus topologies. |
| Slew-rate controlled driver outputs | Limits edge rates to reduce EMI and allow longer stub lengths (≤19 ft at 250 ns rise time) - enables star or daisy-chain node placement without signal reflection issues. |
| Thermal shutdown protection | Shuts down driver at ~160°C junction temperature - prevents latch-up or permanent damage during sustained bus fault conditions. |
| Power-up/power-down glitch protection | Ensures R, A, and B remain in high-impedance state during supply ramp - avoids bus contention or spurious pulses during MCU reset sequences. |
| Pin compatibility with SN75176 | Direct drop-in replacement for legacy RS-485 interfaces - enables reliability upgrade without layout revision or firmware changes. |
Applications
| Industrial Automation Network | Smart Utility Metering |
|---|---|
Use Scenario: Multi-node Modbus RTU network connecting PLCs, sensors, and HMIs over 1200 m twisted-pair cable in factory floor environment with variable-frequency drives and welding equipment. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver providing galvanically isolated physical layer interface between microcontroller UART and differential bus, with fail-safe biasing and surge resilience. Use Value: Eliminates need for external TVS diodes and termination resistors at each node due to integrated 400 W surge rating and 1/4-unit-load drive strength - reducing node cost by $0.32 and improving mean time between failures (MTBF) by 3.8×. | Use Scenario: AMI (Advanced Metering Infrastructure) endpoint communicating hourly consumption data to concentrators via underground RS-485 trunk lines exposed to lightning-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Robust physical-layer transceiver handling bidirectional polling commands and meter readings under ±15 V common-mode noise and repetitive 400 W transients. Use Value: Survives repeated IEC 61000-4-5 Level 3 surges without degradation, validated over 10,000 pulse life test cycles - extends field lifetime beyond 15 years in harsh utility environments. |
| Motor Drive Control Interface | Building Management System (BMS) |
Use Scenario: Distributed servo drive network where master controller sends position setpoints and receives status feedback across 300 m bus with multiple inverters generating high dv/dt noise. IC Role / Device Role / Timing Role: Differential line driver/receiver translating UART commands into noise-immune RS-485 signals, with slew-rate control to prevent crosstalk into analog current sensing paths. Use Value: Controlled 0.25–1.2 μs rise/fall times suppress radiated emissions below CISPR 11 Class A limits while maintaining 250 kbps throughput - avoids costly shielding or filter redesign. | Use Scenario: HVAC controller network linking thermostats, VAV boxes, and chillers in commercial buildings using unshielded twisted-pair cabling routed alongside 120 VAC power conduits. IC Role / Device Role / Timing Role: RS-485 interface IC enabling reliable command/response communication despite 10 Vpp common-mode noise and intermittent ground loops. Use Value: ±7 V common-mode input range and 70 mV hysteresis reject conducted noise that would cause false triggering in legacy transceivers - reduces field service calls by 62%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75LBC184DR | Same pinout and electrical specs, but rated for 0°C to 70°C only - lacks extended temperature qualification. | Suitable for indoor, climate-controlled environments only; not rated for outdoor enclosures or engine compartments. | Select SN75LBC184DR only if ambient operating temperature remains within 0–70°C and cost sensitivity outweighs field reliability requirements. |
| THVD1550DR | Higher ESD rating (±30 kV HBM, ±12 kV IEC 61000-4-2), 500 kbps data rate, and 1/8-unit-load (256-node) capability - newer generation with improved noise immunity. | Supports faster data rates and denser networks; includes automatic direction control option in some variants. | Choose THVD1550DR for new designs targeting >250 kbps or >128 nodes; SN65LBC184DR remains optimal for cost-sensitive, thermally demanding legacy upgrades. |
Compared with SN75LBC184DR, the SN65LBC184DR offers extended temperature operation (–40°C to +85°C) critical for outdoor industrial use, while THVD1550DR provides higher speed and node density but requires layout review for enhanced ESD layout practices - making SN65LBC184DR the most balanced choice for ruggedized 250 kbps deployments.
Availability
SN65LBC184DR is available at Aetrix Electronics and suitable for industrial automation networks, smart utility metering, and motor control systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN65LBC184DR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The SN65LBC184DR belongs to TI's RS-485 transceiver product line, engineered specifically for high-reliability industrial communications where surge immunity, fail-safe behavior, and extended temperature operation are mandatory design requirements.
FAQ
What is the maximum data rate supported by the SN65LBC184DR?
The SN65LBC184DR supports a maximum data rate of 250 kbps under electrically noisy conditions, as specified in its official datasheet. This performance is achieved with controlled driver slew rates and verified across the full –40°C to +85°C operating temperature range. The device maintains signal integrity at this rate over 4000 ft of cable when used with proper termination and stub-length management.
Does the SN65LBC184DR require external TVS diodes for surge protection?
No, the SN65LBC184DR does not require external TVS diodes for basic IEC 61000-4-5 compliance. It integrates transient voltage suppressors capable of withstanding 400 W peak surge per the combination wave test (1.2/50 µs voltage, 8/20 µs current). This built-in protection eliminates external components in most industrial deployments, though system-level surge protection may still be needed for extreme lightning-prone installations.
How many SN65LBC184DR devices can be connected to a single RS-485 bus?
Up to 128 SN65LBC184DR devices can be connected to a single RS-485 bus. This is enabled by its 1/4 unit load (UL) input impedance, which is four times higher than the standard 1 UL defined in TIA/EIA-485. Each device presents ~48 kΩ load to the bus, allowing the driver to meet the 32 UL minimum drive requirement while supporting large-scale multi-drop networks.
What is the purpose of the open-circuit fail-safe feature in the SN65LBC184DR?
The open-circuit fail-safe feature in the SN65LBC184DR ensures the receiver output (R) goes HIGH when the A and B bus lines are disconnected, shorted together, or left floating. This prevents undefined logic states that could trigger spurious interrupts or incorrect control decisions in microcontrollers. It is implemented via internal biasing and does not require external resistors, simplifying board design and improving system robustness.
Is the SN65LBC184DR pin-compatible with older RS-485 transceivers?
Yes, the SN65LBC184DR is pin-compatible with the industry-standard SN75176 transceiver in SOIC-8 and PDIP-8 packages. This allows direct replacement in existing designs to add integrated transient protection and fail-safe operation without PCB layout changes. Signal timing, voltage levels, and functional pin mapping (A, B, D, DE, /RE, R, GND, VCC) are identical, enabling seamless reliability upgrades.
SN65LBC184DR 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:
- 70 mV
- Data Rate:
- 250kbps
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN65LBC184DR FAQ
1.How can I place an order for SN65LBC184DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65LBC184DR 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 SN65LBC184DR reliable?
The price and inventory of SN65LBC184DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65LBC184DR is usually 5 days.
3.What payment methods are accepted for SN65LBC184DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65LBC184DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65LBC184DR?
SN65LBC184DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65LBC184DR 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 SN65LBC184DR?
For technical support, including SN65LBC184DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65LBC184DR requirements.
6.How does Aetrix verify that SN65LBC184DR is sourced from the original manufacturer or authorized distributors?
All SN65LBC184DR 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 SN65LBC184DR meets industry standards.
7.What is the process for return or replacement of SN65LBC184DR?
All SN65LBC184DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65LBC184DR, 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 SN65LBC184DR part is unused and in its original packaging.
Return procedure for SN65LBC184DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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