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STMicroelectronics ST485EBDR
- Part No.:
- ST485EBDR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST485EBDR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,362
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Product details
Overview
ST485EBDR from STMicroelectronics is a half-duplex RS-485/RS-422 transceiver in SO-8 package, operating from a single 5 V supply with 300 µA quiescent current, ±15 kV HBM ESD protection, and 5 Mbps maximum data rate. It integrates one driver and one receiver for bidirectional multipoint bus communication in industrial control networks.
For engineers reviewing the ST485EBDR datasheet, ST485EBDR pinout, ST485EBDR application, or ST485EBDR 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 tape-and-reel packaging for automated assembly.
Technical Context
The ST485EBDR implements a half-duplex transceiver architecture with independent driver enable (DE) and receiver enable (RE) controls, supporting bus arbitration via three-state driver outputs. Its receiver features a differential threshold of ±0.2 V and 70 mV hysteresis to reject noise in electrically noisy environments.
Driver output complies with RS-485 electrical standards: differential output voltage ≥1.5 V into 27 Ω, common-mode output at 3 V, and short-circuit current limiting (35–250 mA) with thermal shutdown. Receiver input resistance is 96 kΩ across –7 V to +12 V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5 V ±5% - fixed single-supply operation, no level-shifting required |
| Quiescent Current | 300 µA typ. - enables low-power remote nodes and battery-backed systems |
| ESD Protection | ±15 kV HBM, ±8 kV IEC-1000-4-2 contact - eliminates need for external TVS diodes |
| Common-Mode Range | –7 V to +12 V - supports long cable runs with ground potential differences |
| Max Data Rate | 5 Mbps - suitable for high-speed industrial fieldbus and PLC backplane links |
| Propagation Delay | 30 ns typ. - ensures timing margin in synchronous multi-drop protocols |
| Input Hysteresis | 70 mV typ. - improves noise immunity on unterminated or stubbed buses |
Pinout & Package
ST485EBDR is housed in an SO-8 (Small Outline, 8-pin) surface-mount package per ECOPACK® specifications, with 1.27 mm pitch, 4.9 mm body width, and tape-and-reel packaging (2500 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RO | Receiver output | CMOS-compatible logic-level output reflecting differential A–B state |
| 2 RE | Receiver enable (active low) | Asserting low enables receiver; high places RO in high-impedance state |
| 3 DE | Driver enable (active high) | Asserting high enables driver; low forces A/B into high-Z for bus sharing |
| 4 DI | Driver input | CMOS-level input controlling driver polarity; referenced to GND |
| 5 GND | Ground reference | Signal and power return path; must be connected before VCC |
| 6 A | Non-inverting bus terminal | Transmits/receives positive half of differential pair; connects to bus A line |
| 7 B | Inverting bus terminal | Transmits/receives negative half of differential pair; connects to bus B line |
| 8 VCC | Positive supply | 5 V power input; decoupling capacitor (100 nF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Thermal shutdown protection | Automatically disables driver during overload, preventing latch-up or permanent damage |
| High-impedance driver disable | Driver outputs enter true high-Z when DE = low or VCC = 0, enabling multi-transceiver bus sharing |
| Wide common-mode input range | –7 V to +12 V allows reliable operation across ground offsets up to 19 V between nodes |
| Low propagation skew | 5 ns max output skew ensures deterministic timing alignment across complementary signals |
| Controlled slew rate | 15–40 ns rise/fall time limits EMI while maintaining 5 Mbps capability over 1200 m cables |
Applications
| Industrial PLC Networks | Building Automation Systems |
|---|---|
Use Scenario: Multi-node Modbus RTU network connecting temperature controllers, I/O modules, and HMIs over twisted-pair cabling up to 1200 m. IC Role / Device Role / Timing Role: Half-duplex transceiver managing bidirectional serial data exchange under master-slave protocol timing constraints. Use Value: ±15 kV ESD protection prevents field failures during maintenance; 300 µA quiescent current reduces node power budget impact. | Use Scenario: Distributed HVAC controller network using RS-485 to link thermostats, valve actuators, and energy meters across floors. IC Role / Device Role / Timing Role: Bus interface device providing robust differential signaling in electrically noisy building infrastructure environments. Use Value: –7 V to +12 V common-mode range accommodates ground potential shifts between mechanical rooms and rooftop units. |
| Factory Floor Sensor Networks | Remote Metering Infrastructure |
Use Scenario: Wireless gateway-connected sensor cluster (vibration, pressure, flow) reporting to SCADA via wired RS-485 backbone. IC Role / Device Role / Timing Role: Physical layer transceiver converting UART signals to differential bus signals with precise enable/disable timing. Use Value: 5 ns skew and 30 ns propagation delay preserve timing integrity in time-synchronized sampling applications. | Use Scenario: Smart electricity/water meter aggregation using daisy-chained RS-485 to relay consumption data to concentrator units. IC Role / Device Role / Timing Role: Low-power bus transceiver enabling extended battery life in endpoint meters while supporting 5 Mbps burst uploads. Use Value: Thermal shutdown and current limiting protect against wiring faults during field installation and long-term deployment. |
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+ | Same SO-8 package, 300 µA ICC, but only ±12 kV HBM ESD rating; no IEC-1000-4-2 spec | Lacks certified contact-discharge ESD robustness; requires external protection in harsh industrial settings | Select when cost sensitivity outweighs certified ESD requirements and ambient ESD risk is low |
| SN65HVD72DR | Higher 3.3 V supply option, 1/8 unit load (256-node capacity), but 600 µA ICC and no thermal shutdown | Enables denser bus loading but increases power draw and lacks driver fault protection | Select for 3.3 V systems needing maximum node count, where thermal management is externally handled |
Compared with MAX485ESA+ and SN65HVD72DR, ST485EBDR uniquely combines certified ±8 kV IEC contact ESD, thermal shutdown, and 300 µA quiescent current in a 5 V SO-8 solution-making it optimal for unattended industrial nodes requiring both reliability and low standby power.
Availability
ST485EBDR is available at Aetrix Electronics and suitable for industrial PLC networks, building automation systems, factory floor sensor networks, and remote metering infrastructure requiring stable component supply across extended product lifecycles.
Supply support for ST485EBDR 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, microcontroller, power, and sensor solutions for industrial, automotive, 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 ST485EBDR?
The ST485EBDR is rated for operation from –40 °C to +85 °C, validated per its SO-8 package specification and electrical characteristics tables across this full industrial temperature range. All DC and switching parameters-including propagation delay, hysteresis, and supply current-are guaranteed within these limits.
Does ST485EBDR support full-duplex operation?
No, ST485EBDR is a half-duplex transceiver with shared A/B bus terminals and separate DE/RE control lines. It cannot transmit and receive simultaneously. Full-duplex operation requires separate driver and receiver pairs, such as those found in ST485CDR or MAX488 variants.
Can ST485EBDR be used with 3.3 V logic systems?
ST485EBDR requires a 5 V supply (VCC = 5 V ±5%) and is not 3.3 V tolerant on VCC. However, its DI, RE, and DE inputs accept 3.3 V logic levels (VIH = 2.0 V min, VIL = 0.8 V max), enabling direct interface with 3.3 V microcontrollers when powered from 5 V.
How many ST485EBDR devices can connect to a single RS-485 bus?
ST485EBDR presents a standard 1/4-unit load (12 kΩ input resistance), allowing up to 256 transceivers on a single terminated RS-485 bus. This is confirmed by its RIN = 96 kΩ minimum, meeting TIA/EIA-485-A unit-load definition (≥12 kΩ = 1/4 unit load).
ST485EBDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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:
- 70 mV
- Data Rate:
- 5Mbps
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST485EBDR FAQ
1.How can I place an order for ST485EBDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST485EBDR 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 ST485EBDR reliable?
The price and inventory of ST485EBDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST485EBDR is usually 5 days.
3.What payment methods are accepted for ST485EBDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST485EBDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST485EBDR?
ST485EBDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST485EBDR 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 ST485EBDR?
For technical support, including ST485EBDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST485EBDR requirements.
6.How does Aetrix verify that ST485EBDR is sourced from the original manufacturer or authorized distributors?
All ST485EBDR 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 ST485EBDR meets industry standards.
7.What is the process for return or replacement of ST485EBDR?
All ST485EBDR units undergo pre-shipment inspection (PSI). If there is an issue with ST485EBDR, 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 ST485EBDR part is unused and in its original packaging.
Return procedure for ST485EBDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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