TDA51S485HC - Isolated RS-485 Transceiver 500kbps | MORNSUN
MPN: TDA51S485HC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.82 | $1.82 |
| 10 | $1.74 | $17.40 |
| 100 | $1.65 | $165.00 |
| 500 | $1.5 | $750.00 |
| 1,000 | $1.42 | $1,420.00 |
Drop-in alternatives for TDA51S485HC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TDA51SCANHC
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.45 / Unit
View Datasheet →TDA51S485HC Maximum Ratings & Electrical Characteristics
| Product Type | Isolated RS-485/RS-422 Transceiver (with power) |
| Communication Standard | TIA/EIA-485-A compliant |
| Data Rate | Up to 500 kbps |
| Duplex Mode | Half-duplex |
| Fail-Safe Circuit | Yes (integrated) |
| Package | SOIC-16 (300 mil) |
| Mounting Type | Surface Mount |
| Isolation Type | Galvanic isolation (integrated) |
| Number of Transceivers | 1 |
| Protocol Support | RS-485, RS-422 |
| RoHS Status | RoHS compliant (per distributor listing) |
| Typical Applications | Industrial automation, building control |
TDA51S485HC soic-16 (300 mil) Pin Configuration Guide
Complete pinout information for TDA51S485HC (soic-16 (300 mil) package) with 16 pins. This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for TDA51S485HC.
Refer to the datasheet for full pin configuration.
Estimated pin count: 16 pins (digital package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TDA51S485HC is suitable for 6 applications: Industrial Automation and PLC Networks, Building Control and HVAC Systems, Motor Drives and Inverter Communication, Energy Metering and Smart Grid Nodes, Security and Access Control Systems, Battery Management and Energy Storage Communication.
Industrial Automation and PLC Networks
The TDA51S485HC fits industrial automation fieldbus segments because its 500 kbps data rate matches common Profibus DP and Modbus RTU speeds, and its TIA/EIA-485-A compliance guarantees interoperability with standard PLC serial ports. The integrated galvanic isolation separates the noisy factory floor bus from sensitive controller logic, breaking ground loops that arise when machines on different power panels share one RS-485 trunk. The fail-safe circuit keeps receiver outputs defined when a node drops offline or the bus is idle, preventing spurious framing errors in polling-based protocols. Deployed between the MCU UART and the twisted-pair trunk with 120-ohm end-of-line termination, it delivers robust multi-drop communication across long cable runs typical of plant-floor installations.
Recommended
Building Control and HVAC Systems
Building management systems frequently use RS-485 (BACnet MS/TP, Modbus RTU) to link thermostats, dampers, energy meters, and air-handling units across multiple floors. The TDA51S485HC suits this environment because half-duplex 500 kbps operation matches MS/TP and Modbus timing budgets, while the integrated isolation protects controllers from ground-potential differences between riser cable segments and locally powered equipment. Its fail-safe circuit eliminates the external bias resistors that would otherwise be required at the ends of unterminated or lightly loaded trunk lines, simplifying commissioning of large daisy chains. The SOIC-16 footprint allows compact integration into thermostat and controller boards where panel space is limited and long-distance differential signaling reliability is essential.
Recommended
Motor Drives and Inverter Communication
Variable-frequency drives and servo inverters generate large common-mode transients and high dv/dt switching noise that readily destroy non-isolated RS-485 ports. The TDA51S485HC addresses this with its integrated isolation barrier and differential bus signaling compliant with TIA/EIA-485-A, transmitting commands and status at up to 500 kbps between the drive controller and higher-level automation networks. Placed between the drive MCU UART and the fieldbus terminals, it galvanically separates the control electronics ground from the motor-side power stage ground, preventing ground-loop currents from corrupting data or damaging ports. Its industrial-grade construction and fail-safe receiver make it appropriate for the electrically harsh environment surrounding PWM power electronics.
Recommended
Energy Metering and Smart Grid Nodes
Electricity meters, RTUs, and distribution monitoring nodes commonly report over RS-485 trunks running Modbus RTU at 9.6 to 115.2 kbps, comfortably within the TDA51S485HC's 500 kbps capability. The isolation barrier is essential here: metering electronics sit near mains potential, and the isolated transceiver keeps the fieldbus side galvanically separate from the measurement front end, protecting both data integrity and downstream equipment. The fail-safe function is valuable on multi-drop meter buses where meters are periodically powered down for maintenance, keeping the receiver output stable instead of generating error frames. Its SOIC-16 package suits the compact, cost-sensitive PCBs typical of polyphase meter designs, while differential signaling ensures reliable communication over long meter-to-concentrator cable runs.
Recommended
Security and Access Control Systems
Access-control panels, card readers, and CCTV controllers frequently network over RS-485 runs spanning buildings, where cable crossings with power lines introduce common-mode noise. The TDA51S485HC provides the required isolation between distributed reader electronics and the central controller, and its 500 kbps rate covers typical Wiegand-over-RS-485 and proprietary security bus protocols. The fail-safe circuit ensures that a disconnected or powered-off reader does not inject random bytes into the shared bus, which could trigger false alarm events. Half-duplex operation matches the polling/response traffic pattern used by most security controllers, and the SOIC-16 footprint integrates neatly into reader and door-controller boards built for long-distance differential communication.
Recommended
Battery Management and Energy Storage Communication
Battery management systems in energy storage racks often daisy-chain over isolated RS-485 links connecting stack monitors to the master controller, since the bus must cross large voltage domains between series-connected battery modules. The TDA51S485HC's integrated isolation allows each module's BMS electronics to communicate at up to 500 kbps without sharing ground references with adjacent modules or the master, preventing circulating currents through the communication cable. The fail-safe receiver keeps the bus state defined during module power-up sequences, when nodes join the trunk asynchronously. Its industrial qualification philosophy and robust differential interface make it suitable for the electrically noisy environment created by switching converters and contactor switching in storage systems.
Recommended
Recommended Products Summary
Engineering reference data for TDA51S485HC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA51SCANHC |
|---|---|---|
| Package | SOIC-16 (300 mil) | SOIC-16 (300 mil) - same footprint family |
| Brand | MORNSUN | MORNSUN |
| Bus Standard | RS-485 / RS-422 (TIA/EIA-485-A) | CAN bus |
| Data Rate | Up to 500 kbps | [DATA_NEEDED] |
| Duplex Mode | Half-duplex | Half-duplex (CAN) |
| Fail-Safe Circuit | Yes (integrated) | Yes (per family datasheet) |
| Isolation | Integrated galvanic isolation | Integrated galvanic isolation |
| Unit Price (qty 1, as of 2026-09-03) | $1.82 | [DATA_NEEDED] |
| RoHS | Compliant | [DATA_NEEDED] |
Key Differentiators
- Integrated fail-safe circuit eliminates external bias resistors (vs TDA51SCANHC)
- Single-package isolation solution (vs Non-isolated transceiver + optocoupler discrete solution)
- Standard-compliant 500 kbps fieldbus operation (vs TDA51SCANHC (CAN-family))
Design Notes
For long RS-485 runs with the TDA51S485HC, terminate the bus with 120-ohm resistors at both physical ends of the twisted pair. Although the integrated fail-safe circuit removes the need for external A/B bias resistors on idle buses, termination is still required at 500 kbps to suppress reflections on cables longer than roughly a few meters. Keep the stub length from each node's transceiver to the trunk as short as possible (ideally under 0.3 m) to minimize reflections.
Layout the TDA51S485HC so that the logic-side and bus-side circuits remain on opposite sides of the isolation barrier, preserving the device's creepage and clearance performance on the PCB. Decouple both supply domains with 100 nF ceramic capacitors placed within a few millimeters of the respective supply pins. Do not route logic signals across the barrier region, and keep high-voltage or noisy switching traces away from the A/B bus pins to protect the differential signaling integrity.
Do not assume pin-for-pin interchangeability with other isolated RS-485 transceivers such as ADM2483 or ISO3082-class parts: the cross-reference search found no verified drop-in equivalent for the TDA51S485HC, so any substitution requires a full pinout and footprint check against the MORNSUN datasheet. Also verify the supply voltage and isolation voltage ratings directly from the datasheet before finalizing designs, since these values were not included in the verified distributor data behind this page.
Compliance Information
RoHS compliance stated on LCSC and JLCPCB product pages. REACH, lead-free, halogen-free, and conflict-minerals statuses were not stated in the verified data.
