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STMicroelectronics ST485EBN
- Part No.:
- ST485EBN
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ST485EBN.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
ST485EBN from STMicroelectronics is a half-duplex RS-485/RS-422 transceiver in SO-8 package, featuring ±15 kV HBM ESD protection, 300 µA quiescent current, and 5 Mbps maximum data rate. It integrates one driver and one receiver, operates from a single 5 V supply, and supports up to 256 nodes on a multipoint bus for industrial automation communication.
For engineers reviewing the ST485EBN datasheet, ST485EBN pinout, ST485EBN application, or ST485EBN equivalent, key selection criteria include common-mode range (–7 V to +12 V), input hysteresis (70 mV typ.), propagation delay (30 ns typ.), thermal shutdown protection, and SO-8 footprint compatibility with legacy RS-485 designs.
Technical Context
The ST485EBN implements a fail-safe receiver with differential threshold of ±0.2 V and 70 mV hysteresis to reject noise in electrically noisy industrial environments. Its driver features short-circuit current limiting (35–250 mA) and thermal shutdown, forcing outputs into high-impedance state during overload.
Control logic uses independent DE (driver enable) and RE (receiver enable) pins for precise half-duplex bus arbitration. The device maintains high-impedance driver outputs when powered down or in 3-state mode, preventing bus contention in multi-transceiver networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5 V ±5 % - fixed single-supply operation compatible with standard logic rails |
| Quiescent Current | 300 µA typ. - enables low-power remote sensor nodes and battery-backed systems |
| ESD Protection | ±15 kV HBM, ±8 kV IEC-1000-4-2 contact - eliminates need for external TVS diodes in most industrial enclosures |
| Common-Mode Range | –7 V to +12 V - tolerates ground potential differences across long cable runs (up to 1200 m) |
| Max Data Rate | 5 Mbps - supports high-speed PLC backplanes and real-time motion control loops |
| Propagation Delay | 30 ns typ. - ensures timing margin for synchronous multi-drop polling at 5 Mbps |
| Input Hysteresis | 70 mV typ. - rejects EMI-induced false transitions on unterminated or stubbed buses |
Pinout & Package
ST485EBN is housed in an industry-standard SO-8 (Small Outline, 150 mil width) package with 1.27 mm pitch, RoHS-compliant and ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RO | Receiver output | CMOS-compatible logic-level output driving microcontroller UART RX line |
| 2 RE | Receiver enable (active low) | Controls receiver activation; high-Z when disabled to prevent bus loading |
| 3 DE | Driver enable (active high) | Enables differential driver output; synchronized with RE for clean direction switching |
| 4 DI | Driver input | TTL/CMOS-compatible logic input accepting MCU UART TX signal |
| 5 GND | Ground reference | Signal return path shared by driver, receiver, and internal bias circuitry |
| 6 A | Non-inverting bus terminal | Connects to RS-485 bus A line; outputs high during dominant state |
| 7 B | Inverting bus terminal | Connects to RS-485 bus B line; outputs low during dominant state |
| 8 VCC | Positive supply | 5 V power input; decoupling capacitor required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Thermal shutdown protection | Automatically disables driver output under sustained short-circuit conditions, preventing permanent damage |
| High-impedance driver on power-off | Eliminates bus contention during hot-swap or brown-out events without external isolation |
| 256-node bus capacity | Supports large-scale distributed I/O networks using standard 120 Ω termination |
| 70 mV input hysteresis | Reduces susceptibility to ringing and noise-induced glitches on long cables |
| 30 ns propagation delay | Enables reliable full-duplex-equivalent timing in master-slave polling architectures |
Applications
| Industrial PLC Backplane | Building Automation Controller |
|---|---|
Use Scenario: Interconnecting modular I/O cards over a 1-meter backplane with shared RS-485 bus. IC Role / Device Role / Timing Role: Half-duplex transceiver managing bidirectional command/response traffic between CPU and expansion modules. Use Value: 300 µA quiescent current minimizes heat buildup in densely packed chassis; SO-8 footprint allows compact routing. | Use Scenario: Central HVAC controller communicating with 32 zone sensors and actuators via daisy-chained RS-485. IC Role / Device Role / Timing Role: Bus node transceiver handling Modbus RTU frames at 19.2 kbps across 300 m cable runs. Use Value: –7 V to +12 V common-mode range accommodates ground offsets between floor-mounted panels and rooftop units. |
| Smart Energy Meter Gateway | Factory Floor Robotics Link |
Use Scenario: AMI gateway aggregating data from 64 smart meters using isolated RS-485 interfaces. IC Role / Device Role / Timing Role: Isolated-side transceiver relaying DLMS/COSEM packets between isolation barrier and microcontroller. Use Value: ±15 kV HBM ESD rating withstands repeated hot-plug events during field maintenance without external protection. | Use Scenario: Motion controller synchronizing 8 servo drives via daisy-chained RS-485 with deterministic update cycles. IC Role / Device Role / Timing Role: Real-time command transceiver transmitting position setpoints and receiving status feedback every 2 ms. Use Value: 5 Mbps capability supports oversampling for jitter reduction in closed-loop timing-critical paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX485ESA+ | Higher quiescent current (300 µA vs. 230 µA typ.), no thermal shutdown | Lacks driver fault protection; requires external current limiting for short-circuit resilience | Prefer when cost sensitivity outweighs robustness requirements in benign environments |
| SN65HVD72DR | Wider supply range (3.0–5.5 V), integrated 120 Ω termination, lower ESD (±12 kV HBM) | Supports mixed-voltage systems; reduces BOM count but increases thermal load on PCB | Choose for space-constrained designs where termination integration justifies trade-off in ESD margin |
Compared with MAX485ESA+ and SN65HVD72DR, ST485EBN delivers superior fault resilience via thermal shutdown and highest HBM ESD rating, making it optimal for unattended industrial deployments where reliability trumps marginal cost savings or board area reduction.
Availability
ST485EBN is available at Aetrix Electronics and suitable for industrial PLC backplanes, building automation controllers, smart energy meter gateways, and factory floor robotics links requiring stable component supply across extended temperature ranges (–40 °C to +85 °C).
Supply support for ST485EBN 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The ST485E series belongs to ST's industrial interface portfolio, engineered specifically for robust, low-power RS-485/RS-422 communication in harsh electromagnetic environments with wide ground potential variation.
FAQ
What is the operating temperature range for ST485EBN?
The ST485EBN is rated for –40 °C to +85 °C ambient operation, validated per its SO-8 package mechanical and electrical specifications. This range aligns with industrial-grade requirements and matches the ST485EBD variant in tube packaging. Thermal performance remains stable across this span, with supply current varying less than 20% from min to max temperature.
Does ST485EBN support full-duplex RS-422 operation?
No, ST485EBN is a half-duplex transceiver with shared A/B bus terminals and independent DE/RE controls. It lacks separate transmit and receive differential pairs required for true full-duplex RS-422. For full-duplex, ST offers the ST3485EB (pin-compatible SO-8 variant with dedicated TX/RX pairs and identical ESD and power specs).
Can ST485EBN be used without external termination resistors?
External 120 Ω termination is required at both ends of the RS-485 bus for impedance matching and signal integrity above 100 kbps. ST485EBN does not integrate termination; omitting it causes reflections and bit errors at >1 Mbps. Short stubs (<1 m) at low speeds (<100 kbps) may operate without termination, but this is not guaranteed per specification.
How does the thermal shutdown feature behave during overload?
When driver output current exceeds safe limits (e.g., sustained short to ground), internal thermal sensors trigger shutdown within microseconds, forcing A and B outputs into high-impedance state. Recovery occurs automatically after die temperature falls below threshold (~140 °C), restoring normal operation without reset or power cycle.
ST485EBN 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:
- 5Mbps
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
ST485EBN FAQ
1.How can I place an order for ST485EBN through Aetrix?
Please submit a Request for Quotation (RFQ) for ST485EBN 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 ST485EBN reliable?
The price and inventory of ST485EBN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST485EBN is usually 5 days.
3.What payment methods are accepted for ST485EBN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST485EBN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST485EBN?
ST485EBN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST485EBN 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 ST485EBN?
For technical support, including ST485EBN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST485EBN requirements.
6.How does Aetrix verify that ST485EBN is sourced from the original manufacturer or authorized distributors?
All ST485EBN 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 ST485EBN meets industry standards.
7.What is the process for return or replacement of ST485EBN?
All ST485EBN units undergo pre-shipment inspection (PSI). If there is an issue with ST485EBN, 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 ST485EBN part is unused and in its original packaging.
Return procedure for ST485EBN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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