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Texas Instruments SN75179BDR
- Part No.:
- SN75179BDR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN75179BDR.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:16,379
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Product details
Overview
SN75179BDR from Texas Instruments is a dual-function RS-422/RS-485 differential driver and receiver IC in an 8-pin SOIC package, operating from a single 5V supply. It delivers ±200mV receiver input sensitivity, 60mA max driver output current, and supports bus voltages from –7V to 12V - enabling robust full-duplex communication over long industrial bus lines.
For engineers reviewing the SN75179BDR datasheet, SN75179BDR pinout, SN75179BDR application, or SN75179BDR equivalent, key selection criteria include its TIA/EIA-422-B and TIA/EIA-485-A compliance, thermal shutdown protection, 50mV typical input hysteresis, and 12kΩ minimum receiver input impedance for noise-immune operation in noisy factory-floor environments.
Technical Context
The SN75179BDR integrates a current-limited driver with positive/negative output current limiting and thermal shutdown activation at ~150°C junction temperature, plus a high-impedance receiver with ±200mV differential threshold and 50mV hysteresis. Its functional modes support full-duplex balanced transmission with defined logic states for both driver (D → Y/Z) and receiver (A/B → R).
It operates across 0°C to 70°C ambient, requires only a single 5V supply (4.75–5.25V), and maintains specified performance under common-mode input voltages from –7V to 12V - meeting ITU V.11, TIA/EIA-422-B, and TIA/EIA-485-A standards without external biasing or level-shifting components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75V to 5.25V - ensures stable operation with standard 5V rail; no external regulation needed. |
| Driver Output Current | ±60mA max - sufficient to drive 54Ω or 100Ω termination loads per RS-485/422 standards. |
| Receiver Input Sensitivity | ±200mV - reliably detects valid differential signals even under high common-mode noise. |
| Receiver Input Hysteresis | 50mV typical - suppresses false toggling near threshold in electrically noisy industrial settings. |
| Bus Voltage Range | –7V to 12V - accommodates ground potential differences across long cable runs without damage. |
| Operating Temperature | 0°C to 70°C - validated for commercial and light-industrial ambient conditions. |
| Differential Output Voltage | ≥1.5V into 54Ω - meets RS-485 minimum VOD requirement for reliable signal integrity. |
Pinout & Package
SN75179BDR is housed in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, with 1.27mm lead pitch and RoHS-compliant NiPdAu finish. The package is moisture-sensitive Level-1 (unlimited floor life) and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | 5V DC supply connection; bypass capacitor required near pin for noise suppression. |
| 2 - R | Receiver logic output | CMOS-compatible digital output reflecting A–B differential state; drives MCU or FPGA inputs directly. |
| 3 - D | Driver logic input | CMOS/TTL-compatible control input; enables driver output Y/Z based on logic level. |
| 4 - GND | Ground reference | Common return path for supply and signal currents; must be low-impedance to minimize ground bounce. |
| 5 - Y | Non-inverting bus output | Active-high driver output; connects to non-inverting side of twisted-pair bus (e.g., RS-485 A line). |
| 6 - Z | Inverting bus output | Active-low driver output; complements Y to form differential pair (e.g., RS-485 B line). |
| 7 - B | Inverting bus input | Receiver's inverting input; accepts inverted bus signal (e.g., RS-485 B) for differential comparison. |
| 8 - A | Non-inverting bus input | Receiver's non-inverting input; accepts non-inverted bus signal (e.g., RS-485 A) for differential comparison. |
Key Features
| Feature | Design Value |
|---|---|
| TIA/EIA-422-B & 485-A compliance | Fully meets physical layer requirements for interoperability with industry-standard transceivers and infrastructure. |
| Thermal shutdown protection | Automatically disables driver output above ~150°C junction temperature - prevents latch-up or permanent damage during bus fault events. |
| Positive/negative current limiting | Restricts driver output current in both sourcing and sinking directions - protects against short-circuited or miswired bus lines. |
| 12kΩ min receiver input impedance | Enables up to 32 unit loads on a single bus segment without signal degradation or loading-induced timing skew. |
| Single 5V supply operation | Eliminates need for dual-rail or charge-pump circuitry - simplifies power design and reduces BOM count. |
Applications
| Industrial PLC Backplane Communication | Building Automation RS-485 Network |
|---|---|
|
Use Scenario: Full-duplex data exchange between CPU module and I/O expansion cards across a 30cm backplane with shared ground noise. IC Role / Device Role / Timing Role: SN75179BDR acts as the physical layer interface, converting TTL-level control signals to robust differential bus signals and recovering them with hysteresis-enhanced noise immunity. Use Value: Enables error-free communication at 1 Mbps over noisy backplanes by rejecting common-mode noise up to 12V and maintaining ±200mV detection margin. |
Use Scenario: Interconnecting HVAC controllers, lighting nodes, and sensors via daisy-chained RS-485 cabling up to 1200m long in commercial buildings. IC Role / Device Role / Timing Role: SN75179BDR serves as the bus transceiver at each node, driving and receiving differential signals while tolerating ground potential shifts between floors. Use Value: Supports up to 32 nodes per segment with 12kΩ input impedance and –7V to 12V common-mode range - eliminating need for isolated power or signal conditioning. |
| Factory Floor Motor Drive Interface | Point-of-Sale Terminal Serial Link |
|
Use Scenario: Sending real-time motion commands and feedback from a central controller to servo drives mounted near high-current AC motors. IC Role / Device Role / Timing Role: SN75179BDR provides galvanically isolated-like noise rejection through differential signaling, interfacing microcontroller UARTs to motor drive command buses. Use Value: Maintains signal integrity despite EMI from VFDs and contactors due to 50mV input hysteresis and ±60mA driver strength - reducing CRC errors and retransmissions. |
Use Scenario: Reliable serial communication between cash register, barcode scanner, and receipt printer in retail environments with mixed AC/DC power sources. IC Role / Device Role / Timing Role: SN75179BDR functions as the RS-422 line driver/receiver, enabling multi-drop connections where multiple peripherals share one host UART port. Use Value: Delivers deterministic 22ns typical differential output transition time and <40ns propagation delay - ensuring sub-millisecond response for transaction-critical peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential driver/receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX485CPA+ | Half-duplex only; no separate driver input (DE/RE controlled); lower driver current (1.5mA typ sink, 2.5mA typ source). | Suitable for point-to-point or multi-drop half-duplex networks; not usable in full-duplex configurations requiring independent D and R pins. | Select MAX485CPA+ only when full-duplex operation is unnecessary and cost is prioritized over bus flexibility. |
| SN65HVD72DR | RS-485 transceiver with integrated 1/8-unit-load receiver (240kΩ), slew-rate limiting, and ±16kV ESD protection - but no thermal shutdown or current limiting. | Better suited for high-node-count, ESD-prone environments like outdoor kiosks; lacks fault protection for shorted bus wiring. | Choose SN65HVD72DR when ESD robustness and multi-drop scalability outweigh need for driver-side fault protection. |
Compared with MAX485CPA+ and SN65HVD72DR, the SN75179BDR uniquely combines full-duplex capability, thermal shutdown, bidirectional current limiting, and TIA/EIA-422-B compliance - making it the only option among the three qualified for legacy industrial backplane designs requiring simultaneous transmit/receive with intrinsic fault resilience.
Availability
SN75179BDR is available at Aetrix Electronics and suitable for industrial automation, building management systems, and factory floor equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN75179BDR 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial interface solutions.
The SN75179BDR belongs to TI's legacy RS-422/RS-485 interface product line, engineered specifically for robust full-duplex differential communication in electrically harsh environments such as manufacturing plants and utility infrastructure.
FAQ
What standards does the SN75179BDR comply with?
The SN75179BDR meets or exceeds TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11 specifications. These standards define electrical characteristics including differential output voltage, receiver sensitivity, common-mode range, and driver current limits - all verified in the official SN75179BDR datasheet (SLLS003G). Compliance ensures interoperability with certified RS-422 and RS-485 infrastructure.
Does the SN75179BDR support full-duplex operation?
Yes, the SN75179BDR supports true full-duplex operation. Its architecture separates driver and receiver paths: pin 3 (D) controls the driver independently of pins 7–8 (B/A), while pin 2 (R) outputs the receiver result. This allows simultaneous transmission and reception on the same bus - unlike half-duplex transceivers that require direction-control pins. The SN75179BDR datasheet confirms this in Table 6-1 (Driver) and Table 6-2 (Receiver).
What protection features does the SN75179BDR include?
The SN75179BDR includes positive- and negative-current limiting on the driver outputs and thermal shutdown protection that activates at approximately 150°C junction temperature. These features protect against bus shorts, miswiring, and sustained overload conditions. The receiver also provides ±7V to 12V common-mode tolerance and 50mV input hysteresis for noise immunity - all documented in the SN75179BDR datasheet Sections 1, 2, and 4.4.
What is the maximum data rate supported by the SN75179BDR?
The SN75179BDR supports data rates up to 10 Mbps under typical conditions, as inferred from its 22ns typical differential output delay (td(OD)) and 30ns typical transition time (tt(OD)) measured with 54Ω load (Section 4.5). While not explicitly rated for 10 Mbps in the datasheet, these switching characteristics align with RS-422 Class 1 performance and enable reliable operation at 1–5 Mbps over standard cable lengths - consistent with application guidance in TI's interface design resources.
Can the SN75179BDR operate with a 3.3V supply?
No, the SN75179BDR is specified only for 4.75V to 5.25V operation per Section 4.2 of the datasheet. It lacks 3.3V logic compatibility or internal level-shifting. Attempting 3.3V supply risks undefined behavior, insufficient driver output swing, and failure to meet RS-485 VOD minimums. For 3.3V systems, TI recommends alternatives such as the SN65HVD7x family - not the SN75179BDR.
SN75179BDR 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:
- Full
- Receiver Hysteresis:
- 50 mV
- Data Rate:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN75179BDR FAQ
1.How can I place an order for SN75179BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75179BDR 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 SN75179BDR reliable?
The price and inventory of SN75179BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75179BDR is usually 5 days.
3.What payment methods are accepted for SN75179BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75179BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75179BDR?
SN75179BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75179BDR 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 SN75179BDR?
For technical support, including SN75179BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75179BDR requirements.
6.How does Aetrix verify that SN75179BDR is sourced from the original manufacturer or authorized distributors?
All SN75179BDR 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 SN75179BDR meets industry standards.
7.What is the process for return or replacement of SN75179BDR?
All SN75179BDR units undergo pre-shipment inspection (PSI). If there is an issue with SN75179BDR, 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 SN75179BDR part is unused and in its original packaging.
Return procedure for SN75179BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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