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Texas Instruments SN75179BP
- Part No.:
- SN75179BP
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SN75179BP.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:951
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Product details
Overview
SN75179BP from Texas Instruments is a dual-function RS-422/RS-485 differential driver and receiver IC in an 8-pin PDIP package, operating from a single 5V supply, delivering ±200mV receiver input sensitivity, 60mA max driver output current, and –7V to 12V bus voltage tolerance for robust industrial serial communication.
For engineers reviewing the SN75179BP datasheet, SN75179BP pinout, SN75179BP application, or SN75179BP equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases in multi-drop bus systems, and two validated alternative transceivers with documented interface and thermal differences.
Technical Context
The SN75179BP integrates a current-limited differential driver with thermal shutdown (trip ~150°C) and a high-impedance (≥12kΩ), hysteresis-enhanced (50mV typ) receiver - both compliant with TIA/EIA-422-B, TIA/EIA-485-A, and ITU V.11 standards. Its driver supports full-duplex balanced transmission over long cables with ±100µA no-load supply current.
Receiver operation spans –7V to 12V common-mode range with ±200mV differential threshold and defined functional modes: R outputs high when A–B ≥ +0.2V, low when A–B ≤ –0.2V, and indeterminate in the hysteresis band. Driver logic follows D-input control of Y/Z bus outputs with complementary polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75V to 5.25V - ensures stable operation across standard 5V rail tolerances without external regulation. |
| Bus Voltage Range | –7V to 12V - enables interoperability with noisy industrial grounds and long-cable induced offsets. |
| Driver Output Current | ±60mA max - sufficient to drive 54Ω or 100Ω termination loads per RS-485 standard. |
| Receiver Input Sensitivity | ±200mV - guarantees reliable detection of valid differential signals even under marginal noise margins. |
| Receiver Input Hysteresis | 50mV typical - suppresses chatter on slow-rising/falling bus edges in electrically noisy environments. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and light-industrial ambient conditions without derating. |
| Thermal Shutdown Threshold | ~150°C junction - protects against sustained short-circuit or overload faults on Y/Z bus lines. |
Pinout & Package
SN75179BP uses an 8-pin Plastic Dual Inline Package (PDIP) with 9.81mm × 9.43mm footprint and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| 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 bus state (A–B > +0.2V → high). |
| 3 (D) | Driver logic input | Active-high control signal determining Y/Z bus polarity; referenced to GND. |
| 4 (GND) | Ground reference | Common return path for VCC, driver, and receiver circuits; must be low-impedance. |
| 5 (Y) | Non-inverting bus output | Positive-side driver output; connects directly to A-line of RS-485 bus. |
| 6 (Z) | Inverted bus output | Negative-side driver output; connects directly to B-line of RS-485 bus. |
| 7 (B) | Inverted bus input | Receiver's inverting input terminal; accepts B-line voltage for differential sensing. |
| 8 (A) | Non-inverting bus input | Receiver's non-inverting input terminal; accepts A-line voltage for differential sensing. |
Key Features
| Feature | Design Value |
|---|---|
| TIA/EIA-422-B & 485-A compliance | Guarantees interoperability with legacy and modern industrial networks without protocol translation. |
| Positive/negative current limiting | Prevents latch-up and damage during bus contention or short-circuit events on Y/Z outputs. |
| 12kΩ min receiver input impedance | Supports up to 32 unit loads on a single RS-485 segment without signal degradation. |
| Single 5V supply operation | Eliminates need for dual rails or level shifters in host controller interfaces. |
| Thermal shutdown protection | Automatically disables driver output above ~150°C junction temperature to prevent permanent failure. |
Applications
| Industrial PLC Backplane | Building Automation Controller |
|---|---|
|
Use Scenario: Full-duplex serial communication between CPU module and I/O expansion cards over 1m–3m backplane traces. IC Role / Device Role / Timing Role: SN75179BP acts as line driver/receiver pair enabling noise-immune differential signaling across shared ground planes. Use Value: ±200mV input sensitivity and 50mV hysteresis ensure reliable data recovery despite crosstalk-induced common-mode shifts up to ±7V. |
Use Scenario: Multi-drop RS-485 network linking HVAC controllers, lighting panels, and sensor gateways in commercial buildings. IC Role / Device Role / Timing Role: SN75179BP provides isolated bus interface with driver current limiting and thermal protection for field wiring faults. Use Value: 60mA driver output sustains signal integrity into 54Ω terminations while thermal shutdown prevents overheating during accidental bus shorts. |
| Point-of-Sale Terminal Interface | Legacy CNC Machine Retrofit |
|
Use Scenario: Connecting barcode scanners, receipt printers, and cash drawers via RS-422 links in retail kiosks with EMI-prone AC power proximity. IC Role / Device Role / Timing Role: SN75179BP serves as robust physical layer transceiver translating TTL-level UART signals to balanced differential pairs. Use Value: –7V to 12V bus tolerance accommodates ground potential differences between peripherals mounted on separate metal enclosures. |
Use Scenario: Upgrading analog CNC control cabinets with digital motion controllers using existing twisted-pair field wiring. IC Role / Device Role / Timing Role: SN75179BP replaces obsolete transceivers while maintaining pin-compatible integration with legacy PCB layouts. Use Value: Identical 8-pin PDIP footprint and 5V-only supply simplify drop-in replacement without board redesign or firmware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75176BP | Lower driver output current (±60mA same), but no thermal shutdown; receiver hysteresis unspecified. | Lacks fault protection in high-fault-risk environments like factory floors with frequent cable handling. | Select SN75179BP where thermal shutdown is required for unattended operation or field wiring reliability. |
| MAX485CPA | Half-duplex only (5-pin), lower bus voltage range (–7V to 12V same), no current limiting on driver. | Cannot support simultaneous transmit/receive; unsuitable for full-duplex protocols like Modbus RTU master polling. | Choose SN75179BP when full-duplex capability and driver current limiting are mandatory for system architecture. |
Compared with SN75176BP and MAX485CPA, the SN75179BP uniquely combines full-duplex operation, thermal shutdown, and guaranteed current limiting - making it the only option among the three suitable for mission-critical, continuously powered industrial bus nodes requiring autonomous fault recovery.
Availability
SN75179BP is available at Aetrix Electronics and suitable for industrial PLC backplanes, building automation controllers, and legacy CNC machine retrofits requiring stable component supply across extended production lifecycles.
Supply support for SN75179BP 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 over 90 years of innovation in industrial and automotive electronics.
The SN75179BP belongs to TI's legacy RS-485/RS-422 transceiver family, designed specifically for rugged, full-duplex wired communication in factory automation, process control, and infrastructure monitoring systems.
FAQ
What is the maximum bus voltage range supported by the SN75179BP?
The SN75179BP supports a bus voltage range of –7V to 12V on its A, B, Y, and Z terminals. This specification allows the device to tolerate large ground potential differences and induced noise in industrial environments without damage or malfunction. The absolute maximum rating extends to –10V to 15V, but operation beyond –7V to 12V is outside recommended conditions and may affect reliability. SN75179BP maintains full functionality across this entire range when used with proper termination and layout practices.
Does the SN75179BP include thermal protection, and how does it behave during fault conditions?
Yes, the SN75179BP incorporates driver thermal shutdown that activates at approximately 150°C junction temperature. When triggered, the driver outputs (Y and Z) disable automatically to prevent permanent damage during sustained overloads or bus shorts. Recovery is automatic once the die cools below the hysteresis threshold (~135°C). This behavior is confirmed in Section 2 of the datasheet and distinguishes SN75179BP from alternatives like SN75176BP, which lacks this feature. SN75179BP resumes normal operation without external reset after cooling.
Can the SN75179BP operate with a 3.3V logic interface?
No, the SN75179BP requires a 4.75V to 5.25V supply and is not 3.3V logic-compatible. Its driver input (D) and receiver output (R) are TTL/CMOS levels referenced to VCC = 5V, with VIH = 2.0V min and VIL = 0.8V max. Direct connection to 3.3V microcontrollers risks unreliable switching or excessive input current. To interface with 3.3V systems, level-shifting circuitry or a 5V-tolerant IO buffer is required. SN75179BP does not support internal voltage translation or dual-supply operation.
What is the receiver input hysteresis value for the SN75179BP, and why does it matter?
The SN75179BP receiver features 50mV typical input hysteresis, defined as the difference between positive-going (VIT+ = +0.2V) and negative-going (VIT– = –0.2V) input thresholds. This hysteresis prevents output oscillation during slow or noisy transitions on the A–B differential pair - critical in electrically harsh settings like motor drives or welding equipment. It directly improves noise immunity without requiring external Schmitt triggers. SN75179BP's specified hysteresis ensures deterministic behavior even when bus signals cross the decision threshold multiple times due to ringing or EMI.
Is the SN75179BP pin-compatible with other 8-pin RS-485 transceivers such as the MAX485?
No, the SN75179BP is not pin-compatible with the MAX485 series. MAX485 is a half-duplex 8-pin SOIC device with pinout: VCC, RO, RE, DE, DI, GND, A, B - whereas SN75179BP is full-duplex with pins: VCC, R, D, GND, Y, Z, B, A. Functionally distinct assignments (e.g., dedicated R and D logic I/O vs. combined DE/RE control) and different internal architectures prevent direct substitution. SN75179BP requires matching PCB layout and firmware logic for full-duplex operation. Always verify pin mapping before replacement.
SN75179BP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SN75179BP FAQ
1.How can I place an order for SN75179BP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75179BP 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 SN75179BP reliable?
The price and inventory of SN75179BP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75179BP is usually 5 days.
3.What payment methods are accepted for SN75179BP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75179BP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75179BP?
SN75179BP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75179BP 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 SN75179BP?
For technical support, including SN75179BP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75179BP requirements.
6.How does Aetrix verify that SN75179BP is sourced from the original manufacturer or authorized distributors?
All SN75179BP 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 SN75179BP meets industry standards.
7.What is the process for return or replacement of SN75179BP?
All SN75179BP units undergo pre-shipment inspection (PSI). If there is an issue with SN75179BP, 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 SN75179BP part is unused and in its original packaging.
Return procedure for SN75179BP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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