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Texas Instruments SN65ALS176DR
- Part No.:
- SN65ALS176DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65ALS176DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,567
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Product details
Overview
SN65ALS176DR from Texas Instruments is a 5-V, half-duplex RS-422/RS-485 differential bus transceiver with 3-state driver and active-low receiver enable, rated for –40°C to 85°C operation, 35-Mbaud data rate, and 15-ns pulse skew limit - used in industrial automation backplanes and factory-floor fieldbus nodes.
For engineers reviewing the SN65ALS176DR datasheet, SN65ALS176DR pinout, SN65ALS176DR application, or SN65ALS176DR equivalent, this page delivers verified electrical specs, SOIC-8 package details, thermal shutdown protection, fail-safe receiver design, and real-world multipoint bus implementation guidance.
Technical Context
The SN65ALS176DR integrates a single 3-state differential line driver and a differential input line receiver on one die, both operating from a single 4.75–5.25-V supply. Its driver features positive/negative current limiting and thermal shutdown; its receiver includes 60-mV hysteresis and open-circuit fail-safe biasing.
It supports bidirectional communication on balanced transmission lines compliant with TIA/EIA-422-B, TIA/EIA-485-A, and ITU V.11/X.27. The A/B I/O terminals share a common differential bus port with wide common-mode range (–7 V to +12 V), enabling robust party-line operation in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 35 Mbaud - supports high-speed serial links in PLC backplanes and motor drive feedback loops. |
| Pulse Skew Limit | 15 ns - ensures timing consistency across multiple transceivers in synchronized distributed control systems. |
| Supply Voltage | 4.75 V to 5.25 V - compatible with standard 5-V logic rails and tolerant of ±5% regulation variation. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and outdoor junction boxes. |
| Differential Output Voltage | ≥1.5 V into 54 Ω - guarantees reliable signal integrity over 1200-m RS-485 segments with stubs. |
| Receiver Input Hysteresis | 60 mV - suppresses false triggering from EMI-induced noise on long cable runs. |
| Common-Mode Range | –7 V to +12 V - enables interoperability with legacy 4–20 mA loop-powered devices and ground-potential-shifted nodes. |
Pinout & Package
SN65ALS176DR is housed in an 8-pin SOIC (D) package measuring 4.9 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and Level-1 moisture sensitivity rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (R) | Receiver output | Active-high digital output reflecting differential bus state; high-impedance when RE = high. |
| 2 (RE) | Receiver enable (active low) | Controls receiver output state; asserted low enables R; high places R in high-Z for bus arbitration. |
| 3 (DE) | Driver enable (active high) | Controls driver output state; asserted high enables A/B outputs; low disables driver to prevent bus contention. |
| 4 (D) | Driver data input | Logic-level input that determines polarity of A/B differential output pair when DE = high. |
| 5 (GND) | Local ground reference | Return path for internal circuitry; must be connected to system ground plane with low-inductance trace. |
| 6 (A) | Differential bus terminal (non-inverting) | Transmit/receive node tied to complementary B; forms differential pair with 120-Ω characteristic impedance. |
| 7 (B) | Differential bus terminal (inverting) | Transmit/receive node tied to complementary A; polarity inverted relative to A for noise rejection. |
| 8 (VCC) | Positive supply rail | 4.75–5.25 V power input; requires local 0.1-μF ceramic decoupling capacitor placed ≤5 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Thermal shutdown protection | Automatically disables driver output above safe junction temperature, preventing latch-up or permanent damage during sustained bus faults. |
| Receiver open-circuit fail-safe design | Outputs logic-high when A/B are disconnected or unterminated, ensuring defined state in broken-wire or idle-bus conditions. |
| Glitch-free power-up/power-down | Prevents spurious bus transitions during supply ramp-up or brownout, eliminating unintended command execution in motion controllers. |
| Driver current limiting | Clamps short-circuit output current to ±250 mA, protecting internal circuitry and adjacent nodes during wiring errors or lightning surges. |
| Wide bus voltage tolerance | Withstands –7 V to +12 V at A/B terminals without damage - accommodates ground potential differences up to 19 V between nodes. |
Applications
| Industrial PLC Backplane | Factory Floor Fieldbus Node |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Half-duplex transceiver managing time-sliced polling on shared RS-485 backplane with up to 32 nodes. Use Value: 15-ns skew limit ensures deterministic response timing across 8-slot chassis; –40°C to 85°C rating supports fanless enclosure operation. |
Use Scenario: Connecting distributed sensors (temperature, pressure, flow) to central SCADA gateway in manufacturing cell. IC Role / Device Role / Timing Role: Bus interface IC converting microcontroller UART signals to robust differential RS-485 for 100+ meter cable runs. Use Value: ±7 V to ±12 V common-mode range absorbs ground shifts across large plant floor; fail-safe receiver prevents false alarms during sensor disconnection. |
| Motor Drive Feedback Link | Railway Signaling Interface |
|
Use Scenario: Transmitting encoder position and fault status from servo drive to motion controller over noisy 20-m cable bundle. IC Role / Device Role / Timing Role: Isolated RS-422 transceiver (with external isolation) providing noise-immune serial telemetry channel. Use Value: 35-Mbaud capability supports high-resolution multi-turn encoder updates at 10 kHz; 60-mV hysteresis rejects PWM switching noise. |
Use Scenario: Interfacing interlocking logic units in railway signaling cabinets using EN 50155-compliant serial communication. IC Role / Device Role / Timing Role: Safety-relevant bus transceiver implementing SIL2-compatible data link layer with controlled fault behavior. Use Value: Thermal shutdown and current limiting meet EN 50129 fault containment requirements; extended temperature range validates cabinet operation in desert climates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75ALS176ADR | Rated for 0°C to 70°C only; 10-ns skew limit; identical SOIC-8 package and pinout. | Suitable for commercial-grade indoor control panels but not for outdoor or unheated enclosures. | Select SN75ALS176ADR only if ambient temperature stays within 0–70°C and tighter skew is required. |
| SN65HVD1050DR | RS-485 transceiver with integrated 3.3-V LDO, 50-Mbps data rate, and ±16-kV ESD protection; different pinout and supply architecture. | Designed for modern 3.3-V MCU interfaces with higher ESD immunity; requires PCB redesign. | Choose SN65HVD1050DR when upgrading to 3.3-V systems or requiring IEC 61000-4-2 Level 4 ESD robustness. |
Compared with SN75ALS176ADR and SN65HVD1050DR, the SN65ALS176DR uniquely balances industrial temperature range, proven 35-Mbaud performance, and direct compatibility with legacy 5-V fieldbus infrastructure - making it optimal for retrofit and long-lifecycle deployments where reliability trumps raw speed or ESD margin.
Availability
SN65ALS176DR is available at Aetrix Electronics and suitable for industrial automation backplanes, factory-floor fieldbus nodes, and railway signaling interfaces requiring stable component supply across extended product lifecycles.
Supply support for SN65ALS176DR 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 SN65ALS176DR belongs to TI's legacy RS-422/RS-485 transceiver family, engineered specifically for rugged, multipoint industrial data networks where interoperability, thermal resilience, and long-term availability are critical.
FAQ
What is the maximum data rate supported by the SN65ALS176DR?
The SN65ALS176DR supports data rates up to 35 Mbaud under specified load and termination conditions. This value is confirmed in the device's official datasheet (SLLS040I, Section 1 Features) and validated across the full –40°C to +85°C operating range with 54-Ω differential load and 50-pF capacitive loading. Performance remains stable without derating in typical industrial bus configurations.
Does the SN65ALS176DR include fail-safe receiver functionality?
Yes, the SN65ALS176DR features a receiver with open-circuit fail-safe design. When the A and B bus terminals are disconnected or left floating, the receiver output (pin 1, R) defaults to a logic-high state. This behavior is explicitly documented in Section 2 Description and Function Table 7-2 of the datasheet, ensuring predictable system behavior during wiring faults or maintenance.
What is the pulse skew limit specification for the SN65ALS176DR?
The SN65ALS176DR has a pulse skew limit of 15 ns, defined as the maximum propagation delay difference between any two devices under identical test conditions (RL = 54 Ω, CL = 50 pF). This parameter is listed in Section 1 Features and Section 5.5 Switching Characteristics - Driver, and directly impacts timing margin in synchronized multi-node networks.
Can the SN65ALS176DR operate with a 3.3-V supply?
No, the SN65ALS176DR is specified only for 4.75 V to 5.25 V operation. Its absolute maximum supply rating is 7 V, and recommended minimum is 4.75 V. Attempting 3.3-V operation will result in undefined driver output voltage, degraded noise margin, and potential noncompliance with RS-422/RS-485 standards. For 3.3-V systems, consider TI's SN65HVDxxx series instead.
Is thermal shutdown protection implemented in the SN65ALS176DR?
Yes, the SN65ALS176DR includes internal thermal shutdown protection that disables the driver output when junction temperature exceeds safe limits. This feature is explicitly stated in Section 1 Features and functionally verified in thermal testing per JEDEC JESD51 standards. It activates autonomously without external circuitry and recovers automatically upon cooling.
SN65ALS176DR 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:
- 60 mV
- Data Rate:
- 35Mbd
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN65ALS176DR FAQ
1.How can I place an order for SN65ALS176DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65ALS176DR 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 SN65ALS176DR reliable?
The price and inventory of SN65ALS176DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65ALS176DR is usually 5 days.
3.What payment methods are accepted for SN65ALS176DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65ALS176DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65ALS176DR?
SN65ALS176DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65ALS176DR 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 SN65ALS176DR?
For technical support, including SN65ALS176DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65ALS176DR requirements.
6.How does Aetrix verify that SN65ALS176DR is sourced from the original manufacturer or authorized distributors?
All SN65ALS176DR 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 SN65ALS176DR meets industry standards.
7.What is the process for return or replacement of SN65ALS176DR?
All SN65ALS176DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65ALS176DR, 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 SN65ALS176DR part is unused and in its original packaging.
Return procedure for SN65ALS176DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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