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Texas Instruments SN65LBC182DR
- Part No.:
- SN65LBC182DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65LBC182DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,129
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Product details
Overview
SN65LBC182DR from Texas Instruments is a 5-V, half-duplex RS-485/RS-422 differential bus transceiver in SOIC-8 package, featuring one-fourth unit load (128-node bus capacity), 250-kbps signaling rate, ±15-kV HBM ESD protection, and fail-safe open-circuit receiver output. It operates across −40°C to +85°C and supports industrial process control networks with controlled slew-rate driver outputs.
For engineers reviewing the SN65LBC182DR datasheet, SN65LBC182DR pinout, SN65LBC182DR application, or SN65LBC182DR equivalent, key selection criteria include its thermal shutdown protection, 70-mV receiver hysteresis, low 250-μA disabled supply current, and compatibility with TIA/EIA-485-A and ISO 8482 standards for robust multi-drop communication in electrically noisy environments.
Technical Context
The SN65LBC182DR integrates a 3-state differential line driver and a differential input line receiver on a single 5-V supply, with independent active-high driver enable (DE) and active-low receiver enable (RE). Its driver employs slew-rate control to limit edge rates, enabling longer stub lengths and improved noise immunity on unterminated lines.
The receiver features open-circuit fail-safe design (output high when A/B floating), 70-mV typical hysteresis, and input thresholds of ±0.2 V. Both driver and receiver support wide common-mode voltage range (−7 V to +12 V), making it suitable for party-line applications where ground potential differences exist between nodes.
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 and tolerance for regulator drift or line drop. |
| Signaling Rate | Up to 250 kbps - supports medium-speed industrial data links without requiring high-frequency layout controls. |
| Differential Output Voltage | 1.5 V to 2.2 V (min/max at 54-Ω load) - delivers sufficient noise margin for reliable detection over long cables. |
| Receiver Input Hysteresis | 70 mV typical - suppresses false toggling from bus noise near threshold, critical in noisy factory environments. |
| ESD Protection | ±15 kV HBM on A/B/GND pins - enables direct cabling without external TVS diodes in many utility meter and PLC designs. |
| Disabled Supply Current | 250 μA maximum - allows low-power sleep modes in battery-backed or energy-conscious remote nodes. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial ambient conditions including outdoor metering enclosures. |
Pinout & Package
SN65LBC182DR is housed in an 8-pin SOIC (D) package measuring 4.9 mm × 6 mm, with 1.27-mm lead pitch and RoHS-compliant NiPdAu finish. The package is moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH) and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (R) | Receiver Output | CMOS-compatible digital output reflecting differential bus state; high-impedance when RE = high. |
| 2 (RE) | Active-Low Receiver Enable | Disables receiver output (high-Z) when logic high; enables receiver when pulled low. |
| 3 (DE) | Active-High Driver Enable | Enables driver output (A/B) when logic high; places A/B in high-Z when low. |
| 4 (D) | Driver Input | Logic-level input controlling driver polarity: D = high → A > B; D = low → A < B. |
| 5 (GND) | Ground Reference | Common return for internal circuitry and decoupling; must be low-impedance to minimize ground bounce. |
| 6 (A) | Non-Inverting Bus I/O | Differential bus terminal; connects to non-inverting side of RS-485 twisted pair. |
| 7 (B) | Inverting Bus I/O | Differential bus terminal; connects to inverting side of RS-485 twisted pair. |
| 8 (VCC) | Power Supply | 5-V supply input; requires local 0.1-μF ceramic decoupling capacitor placed within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| One-fourth unit load | Enables up to 128 transceivers on same bus segment without signal degradation or termination mismatch. |
| Slew-rate-controlled driver | Reduces EMI and allows stub lengths >10 cm on 120-Ω cable - simplifies PCB routing and reduces need for point-to-point topology. |
| Fail-safe receiver | Outputs logic high when A/B are open or shorted - prevents undefined UART framing errors during cable disconnect or fault conditions. |
| Thermal shutdown protection | Internally disables driver if junction temperature exceeds safe limit - prevents latch-up or permanent damage during overload or poor heatsinking. |
| Glitch-free power sequencing | Ensures R remains high-Z during power-up/down transitions - avoids spurious UART start bits or bus contention at system boot. |
Applications
| Utility Meters | Industrial Process Control |
|---|---|
Use Scenario: Two-way communication between smart electricity meters and concentrator gateways over twisted-pair wiring in substations or street cabinets. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver managing bidirectional command/response traffic at 9.6–19.2 kbps, with robustness against induced surges and ground shifts. Use Value: 128-node bus capacity supports dense meter deployments; ±15-kV HBM withstands lightning-induced transients on outdoor runs. |
Use Scenario: Connecting programmable logic controllers (PLCs), I/O modules, and HMIs in factory automation systems using Modbus RTU over daisy-chained RS-485. IC Role / Device Role / Timing Role: Physical layer interface converting UART signals to differential bus levels, supporting up to 250 kbps for fast sensor polling cycles. Use Value: Slew-rate control enables 300+ meter cable runs without termination resistors; fail-safe output prevents controller lockup during sensor module hot-swap. |
| Building Automation | Power Inverter Monitoring |
Use Scenario: Interfacing HVAC controllers, lighting panels, and occupancy sensors via BACnet MS/TP over shared RS-485 backbone in commercial buildings. IC Role / Device Role / Timing Role: Bus transceiver handling token-passing protocol frames with deterministic timing; operates reliably across varying building ground potentials. Use Value: Wide common-mode range (−7 V to +12 V) accommodates ground offsets between floors or wings; low 250-μA quiescent current extends battery backup duration. |
Use Scenario: Real-time telemetry link between solar inverters and central monitoring units in photovoltaic farms, exposed to EMI from switching converters and lightning. IC Role / Device Role / Timing Role: Isolated RS-485 interface (when paired with digital isolators) transmitting DC voltage, current, and fault status at 115.2 kbps. Use Value: Thermal shutdown protects against sustained bus faults during grid faults; 70-mV hysteresis rejects PWM noise coupling onto communication lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX13487EESA+ | Integrated auto-direction control (no separate DE/RE pins); 1/4-unit load; 16-Mbps max rate; lower 125-μA shutdown current. | Better suited for UART-to-RS-485 bridge designs where MCU GPIO count is constrained; not pin-compatible with SN65LBC182DR. | Select MAX13487EESA+ when simplifying control logic is prioritized over legacy pinout compatibility. |
| THVD1550DR | Higher ESD rating (±18-kV contact); 500-mA bus fault current protection; 500-kbps max rate; same SOIC-8 package and pinout. | Offers enhanced surge resilience for outdoor or unshielded installations; identical pin assignment enables drop-in replacement in most layouts. | Select THVD1550DR when upgrading existing SN65LBC182DR designs for higher EMC robustness without board revision. |
Compared with MAX13487EESA+, SN65LBC182DR provides explicit DE/RE control for precise timing-critical direction management, while THVD1550DR delivers superior fault protection and speed headroom with full pin compatibility-making it the preferred upgrade path for reliability-critical deployments.
Availability
SN65LBC182DR is available at Aetrix Electronics and suitable for utility metering, industrial process control, building automation, and power inverter monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN65LBC182DR 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, longevity, and industrial-grade qualification.
The SN65LBC182DR belongs to TI's RS-485 transceiver portfolio designed specifically for robust, multi-node industrial communications in harsh electrical environments-prioritizing ESD resilience, thermal safety, and interoperability with legacy TIA/EIA-485-A infrastructure.
FAQ
What is the maximum bus node count supported by SN65LBC182DR?
The SN65LBC182DR features a one-fourth unit load input impedance, allowing up to 128 transceivers on a single RS-485 bus segment without exceeding the standard 32-unit load limit. This is confirmed in the device's datasheet Section 1 (Features) and Section 5.7 (Receiver Electrical Characteristics), where bus input current is specified at ±250 μA under ±12-V common-mode conditions.
Does SN65LBC182DR support full-duplex operation?
No, SN65LBC182DR is a half-duplex transceiver: it shares the same differential bus terminals (A and B) for both driver output and receiver input. Full-duplex operation would require separate transmit and receive pairs, which this device does not implement. Its functional block diagram and pin configuration (Figure 4-1 and Table 4-1) confirm single A/B I/O port architecture.
What is the purpose of the thermal shutdown protection in SN65LBC182DR?
The thermal shutdown protection in SN65LBC182DR disables the driver output when the internal junction temperature exceeds a safe threshold-preventing permanent damage during sustained bus short circuits, excessive loading, or inadequate PCB copper area. This behavior is documented in Section 1 (Features) and verified in thermal test conditions per Section 5.5.
Can SN65LBC182DR operate with a 3.3-V supply?
No, SN65LBC182DR is specified only for 4.75 V to 5.25 V operation, as stated in Section 5.4 (Recommended Operating Conditions). Attempting 3.3-V operation results in undefined driver output voltage, degraded receiver thresholds, and potential failure to meet TIA/EIA-485-A compliance-verified by absolute maximum ratings and electrical characteristics tables.
How does the fail-safe receiver in SN65LBC182DR behave during open-circuit conditions?
When the A and B bus lines are disconnected (open circuit), the SN65LBC182DR receiver output (pin R) defaults to a logic high state-ensuring predictable UART idle framing and preventing spurious interrupts. This is achieved via internal biasing and explicitly described in Section 3 (Description) and Section 7.2 (Device Functional Modes) as "open-circuit fail-safe receiver design."
SN65LBC182DR 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
SN65LBC182DR FAQ
1.How can I place an order for SN65LBC182DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65LBC182DR 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 SN65LBC182DR reliable?
The price and inventory of SN65LBC182DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65LBC182DR is usually 5 days.
3.What payment methods are accepted for SN65LBC182DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65LBC182DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65LBC182DR?
SN65LBC182DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65LBC182DR 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 SN65LBC182DR?
For technical support, including SN65LBC182DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65LBC182DR requirements.
6.How does Aetrix verify that SN65LBC182DR is sourced from the original manufacturer or authorized distributors?
All SN65LBC182DR 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 SN65LBC182DR meets industry standards.
7.What is the process for return or replacement of SN65LBC182DR?
All SN65LBC182DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65LBC182DR, 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 SN65LBC182DR part is unused and in its original packaging.
Return procedure for SN65LBC182DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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