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STMicroelectronics ST75C176BN
- Part No.:
- ST75C176BN
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ST75C176BN.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,710
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Product details
Overview
ST75C176BN from STMicroelectronics is a low-power, half-duplex RS-485/RS-422 transceiver in an 8-pin DIP package, featuring 300 µA typical quiescent current, ±7 V to +12 V common-mode input range, and 2.5 Mbps maximum data rate. It integrates one driver and one receiver with thermal shutdown, current limiting, and fail-safe receiver logic for robust industrial bus communication.
For engineers reviewing the ST75C176BN datasheet, ST75C176BN pinout, ST75C176BN application, or ST75C176BN equivalent, key selection criteria include its -40 °C to +85 °C operating temperature, 30 ns driver propagation delay, 70 mV input hysteresis, and compatibility with 32-node multidrop buses under RS-485 standards.
Technical Context
The ST75C176BN implements a BiCMOS-based transceiver architecture optimized for half-duplex RS-485 multipoint networks. Its driver provides differential output voltage ≥1.5 V into 27 Ω (RS-485) or 50 Ω (RS-422), while the receiver delivers fail-safe high output on open inputs and supports ±12 V common-mode range.
Control logic uses separate DE (driver enable) and RE (receiver enable) pins for precise direction control, with independent 3-state outputs and high-impedance behavior during power-off or disable states. Propagation delays (30 ns typ. driver, 130 ns typ. receiver) and 5 ns skew ensure timing integrity at 2.5 Mbps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5 V ±5 % - single-rail operation compatible with standard logic systems |
| Quiescent Current | 300 µA typ. - enables low-power remote nodes and battery-backed systems |
| Common-Mode Range | -7 V to +12 V - tolerates ground potential differences across long industrial cables |
| Max Data Rate | 2.5 Mbps - supports medium-speed automation and PLC backplane communication |
| Differential Output | ≥1.5 V into 27 Ω - meets RS-485 minimum driver output specification |
| Input Hysteresis | 70 mV typ. - improves noise immunity against EMI in electrically noisy environments |
| Propagation Delay | 30 ns typ. (driver), 130 ns typ. (receiver) - defines timing budget for full-duplex emulation or tight-loop control |
Pinout & Package
Package: Plastic DIP-8 (0.300" wide), lead-free ECOPACK® compliant, with 2.54 mm pin pitch and 9.8 mm × 8.8 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RO | Receiver output | Logic-level CMOS/TTL-compatible output; high when A–B ≥ +0.2 V, low when ≤ –0.2 V |
| 2 RE | Receiver enable (active-low) | Drives RO to high-impedance when high; enables receiver function when low |
| 3 DE | Driver enable (active-high) | Enables differential driver output on A/B when high; disables to high-Z when low |
| 4 DI | Driver input | CMOS/TTL-level input controlling driver polarity; referenced to GND |
| 5 GND | Ground reference | Signal and power return path; must be connected before VCC for safe operation |
| 6 A | Non-inverting I/O terminal | Transmits DI logic as positive differential signal; receives non-inverted bus data |
| 7 B | Inverting I/O terminal | Transmits complement of DI; receives inverted bus data; forms differential pair with A |
| 8 VCC | Positive supply | 5 V ±5 % input; powers both driver and receiver; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe receiver | Guarantees RO = high when A/B inputs are open or shorted - prevents undefined logic states on unterminated buses |
| Thermal shutdown | Disables driver outputs into high-impedance upon excessive junction temperature - protects against sustained short-circuit faults |
| Current-limited driver | Peak short-circuit current limited to 35–250 mA - avoids latch-up and enables self-recovery after overload |
| High-impedance on power-off | Driver and receiver outputs enter high-Z state when VCC = 0 V - prevents back-driving of powered bus segments |
| 32-node bus support | Input resistance ≥12 kΩ - allows up to 32 transceivers on same RS-485 line without violating load limits |
Applications
| Industrial PLC Networks | Building Automation Systems |
|---|---|
Use Scenario: Multi-drop serial communication between programmable logic controllers and remote I/O modules over twisted-pair cabling up to 1200 m. IC Role / Device Role / Timing Role: Half-duplex RS-485 transceiver managing bidirectional data flow with precise DE/RE timing coordination. Use Value: ±7 V to +12 V common-mode range rejects ground loop noise in factory-floor wiring; 300 µA quiescent current reduces heat buildup in dense rack-mounted installations. | Use Scenario: Interconnecting HVAC controllers, lighting panels, and security sensors via BACnet MS/TP or proprietary RS-485 protocols. IC Role / Device Role / Timing Role: Bus interface device enabling reliable node addressing and collision-free polling in deterministic building networks. Use Value: Fail-safe receiver ensures default 'idle high' state during cable disconnection or sensor failure - maintains system visibility and fault detection. |
| Energy Metering Gateways | Railway Signaling Interfaces |
Use Scenario: Aggregating consumption data from smart meters using DLMS/COSEM over RS-485 physical layer in utility substations. IC Role / Device Role / Timing Role: Isolated bus transceiver (when paired with external isolation) handling burst-mode meter reads with low standby power. Use Value: 2.5 Mbps capability supports rapid firmware updates; thermal shutdown prevents damage during lightning-induced surges on outdoor meter runs. | Use Scenario: Communication between interlocking units and trackside equipment in EN 50155-compliant signaling systems. IC Role / Device Role / Timing Role: Ruggedized RS-485 interface ensuring deterministic command delivery under wide temperature (-40 °C to +85 °C) and EMI stress. Use Value: DIP-8 package enables through-hole mounting for vibration resistance; 70 mV hysteresis suppresses rail-switching noise in DC traction environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX485CPA+ | Higher quiescent current (300 µA vs. 230 µA min.), no thermal shutdown, same DIP-8 footprint | Lacks fail-safe output and thermal protection - requires external circuitry for robustness in harsh environments | Select when cost sensitivity outweighs need for integrated protection features |
| SN65HVD72DR | 3.3 V supply only, 1/8 unit load (supports 256 nodes), enhanced ESD (±16 kV HBM) | Not pin-compatible; requires level-shifting for 5 V systems; superior noise immunity for high-density PCBs | Select for new 3.3 V designs requiring higher node count and stronger ESD resilience |
Compared with MAX485CPA+ and SN65HVD72DR, the ST75C176BN offers unique value in legacy 5 V industrial systems needing thermal protection, fail-safe operation, and guaranteed -40 °C to +85 °C performance without redesign or voltage translation.
Availability
ST75C176BN is available at Aetrix Electronics and suitable for industrial PLC networks, building automation systems, energy metering gateways, and railway signaling interfaces requiring stable component supply across extended temperature ranges.
Supply support for ST75C176BN 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and power applications since 1987.
The ST75C176B/C series was developed specifically for cost-sensitive, low-power RS-485/RS-422 bus interfaces in industrial control and instrumentation, emphasizing reliability under wide temperature and EMI stress.
FAQ
What is the maximum number of ST75C176BN transceivers supported on a single RS-485 bus?
The ST75C176BN presents a 1-unit load (12 kΩ minimum input resistance), allowing up to 32 devices on one bus segment per RS-485 standard. This assumes proper termination, biasing, and cable impedance matching (120 Ω). Exceeding this count increases capacitive loading and may degrade signal integrity above 1 Mbps.
Does the ST75C176BN support full-duplex RS-422 operation?
No - the ST75C176BN is a half-duplex transceiver with shared A/B differential I/O lines. It lacks separate transmit and receive pairs required for true full-duplex RS-422. For full-duplex, ST recommends the ST75C180 or ST75C182, which provide independent driver/receiver terminals.
How does the fail-safe feature behave when the A and B lines are shorted together?
When A and B are shorted, the differential input voltage is 0 V, falling within the receiver's undefined region (–0.2 V to +0.2 V). However, the internal fail-safe bias network pulls RO high under open, shorted, or terminated-but-idle conditions - ensuring a defined logic-high output regardless of bus state.
Can the ST75C176BN operate reliably at 5.5 V supply?
No - absolute maximum VCC is 7 V, but electrical characteristics are specified only for 5 V ±5 % (4.75–5.25 V). Operation at 5.5 V exceeds recommended conditions and may cause increased ICC, reduced noise margins, or accelerated parametric drift. Use a regulated 5.0 V supply for guaranteed performance.
ST75C176BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Transceiver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 70 mV
- Data Rate:
- 2.5Mbps
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
ST75C176BN FAQ
1.How can I place an order for ST75C176BN through Aetrix?
Please submit a Request for Quotation (RFQ) for ST75C176BN 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 ST75C176BN reliable?
The price and inventory of ST75C176BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST75C176BN is usually 5 days.
3.What payment methods are accepted for ST75C176BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST75C176BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST75C176BN?
ST75C176BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST75C176BN 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 ST75C176BN?
For technical support, including ST75C176BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST75C176BN requirements.
6.How does Aetrix verify that ST75C176BN is sourced from the original manufacturer or authorized distributors?
All ST75C176BN 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 ST75C176BN meets industry standards.
7.What is the process for return or replacement of ST75C176BN?
All ST75C176BN units undergo pre-shipment inspection (PSI). If there is an issue with ST75C176BN, 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 ST75C176BN part is unused and in its original packaging.
Return procedure for ST75C176BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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