SP3490EN-L/TR - 3.3V Full-Duplex RS-485/RS-422 Transceiver | MaxLinear
MPN: SP3490EN-L/TR ✓ فعالSP3490EN-L/TR جائزہ
An RS-485/RS-422 transceiver is a differential line driver/receiver IC that converts TTL/CMOS logic levels on the UART or controller side into balanced differential signals on a twisted-pair bus, enabling reliable multi-drop communication over long cable runs. SP3490EN-L/TR operates as a full-duplex link (separate driver output and receiver input pins), sits in the interface-IC family inside the broader signal-path taxonomy (transceiver -> line driver/receiver -> interface IC -> semiconductor). It interoperates with industry-standard 3.3V transceivers such as the MAX3485 and MAX3490, simplifying second-source qualification.
Key features include driver slew-rate limited edges to control EMI, thermal-shutdown protection, short-circuit protection on the bus outputs, and a high-impedance shutdown mode (only on SP3491 variant; the SP3490 has permanently enabled driver/receiver paths). The BiCMOS process keeps quiescent current low while still supporting 10 Mbps signaling, which is significantly faster than legacy 2.5 Mbps RS-485 parts and sufficient for PROFIBUS, DMX512, and many industrial fieldbus extensions.
Architecturally, the SP3490EN-L/TR uses a charge-pump to generate the higher rail needed for true RS-485 output swings from a single 3.3V supply, avoiding the dual +/-5V rails required by older generations. The receiver offers a 200 mV input hysteresis for noise immunity on long bus stubs.
Typical applications include multi-drop RS-485 networks, point-to-point RS-422 links, DMX512 stage lighting, industrial PLC backplanes, and building-automation gateways requiring 3.3V-only logic compatibility. It is widely paired with low-power MCUs such as STM32 and ESP32 that operate natively at 3.3V.
For robust bus design, use 120 Ω termination at both cable ends, place a 100 nF decoupling capacitor within 5 mm of the VCC pin, and ensure stub lengths remain under one-tenth of the driver's rise time at the data rate used.
This page synthesizes distributor pricing, drop-in cross-brand equivalents, and PCB design notes that complement the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل SP3490EN-L/TR — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں SP3490EN-L/TR (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Product Type, Supply Voltage, Supply Voltage Range.
SP3491EN-L/TR
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
SP3490EN-L
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MAX3485ESA+T
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX3490ESA+T
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →SN65HVD73DR
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ADM3485EARZ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
SP485EEN-L/TR
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →SP3490EN-L/TR تفصیلات
| Protocol Supported | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| ڈیٹا ریٹ | 10 Mbps |
| سپلائی وولٹیج | 3.0 V to 3.6 V |
| Supply Current (typ) | 1 mA |
| Number of Nodes on Bus | 32 |
| ESD Protection (bus pins) | ±2 kV (HBM contact) |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C |
| پیکیج | 8-SOIC (SOIC-8) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| MSL لیول | 1 |
| RoHS اسٹیٹس | Compliant |
| Process Technology | BiCMOS |
| Receiver Hysteresis | 200 mV (typical, per datasheet) |
SP3490EN-L/TR پن کنفیگریشن
| پن 1 | RO — Receiver output (TTL/CMOS logic level to controller UART RX) |
| پن 2 | /RE — Receiver enable, active-low (logic low enables RO output) |
| پن 3 | DE — Driver enable, active-high (logic high enables driver outputs) |
| پن 4 | DI — Driver input (TTL/CMOS logic level from controller UART TX) |
| پن 5 | GND — Ground reference for logic and bus return |
| پن 6 | A/Y — Driver non-inverting output / Receiver non-inverting input |
| پن 7 | B/Z — Driver inverting output / Receiver inverting input |
| پن 8 | VCC — 3.3V supply input (3.0V to 3.6V range) |
عام استعمالات
SP3490EN-L/TR کے لیے موزوں ہے 7 ایپلیکیشنs: Industrial RS-485 Multi-Drop Networks, DMX512 Stage Lighting, Building Automation / HVAC Fieldbus, Point-to-Point RS-422 Links, Industrial PLC and Motor Drives, Sensor Networks and IoT Gateways, Point-of-Sale and Access Control Panels.
Industrial RS-485 Multi-Drop Networks
The SP3490EN-L/TR is well suited to industrial multi-drop RS-485 networks where a 3.3V MCU must communicate with up to 32 nodes over a twisted-pair bus. With its 10 Mbps data rate and 1/1 full-duplex topology, the transceiver can sustain fast bidirectional traffic between PLCs, motor drives, and remote I/O blocks. The ±2 kV HBM ESD on bus pins and short-circuit protection on driver outputs survive the common abuse of motor-control cabinets and fieldbus wiring. Designers typically terminate the cable at both ends with 120 Ω resistors, place a 100 nF decoupling cap within 5 mm of VCC, and keep stubs under one-tenth of the driver rise time. Compared to half-duplex parts like the SP485EEN, the SP3490EN-L/TR's full-duplex channels remove the need for direction-control timing in many PLC protocols.
تجویز کردہ
DMX512 Stage Lighting
DMX512 lighting systems rely on a 250 kbps differential RS-485 link from a lighting controller to hundreds of fixtures. The SP3490EN-L/TR's 10 Mbps data rate is well above the 250 kbps DMX requirement, and its ±2 kV bus ESD tolerance helps it survive repeated cable insertion in live-event setups. The 3.3V supply works directly from typical DMX controller MCUs such as ESP32 or STM32 without level translation, simplifying bill of materials. The 32-node bus limit is rarely hit in a single DMX universe (512 channels per universe spread across fixtures), but large shows often need multiple SP3490EN-L/TR channels stacked. For very long cable runs in theaters, add external failsafe biasing resistors at one node. Compared to 5V MAX485-class parts, the SP3490EN-L/TR halves the logic-side supply current draw.
تجویز کردہ
Building Automation / HVAC Fieldbus
Building-automation gateways commonly use RS-485 to link thermostats, VAV controllers, and access-control panels to a central HVAC or BMS controller. The SP3490EN-L/TR provides the necessary 32-node fan-out with 10 Mbps headroom for protocols like BACnet MS/TP or Modbus RTU extended beyond 115.2 kbps. Its 3.0V to 3.6V supply integrates directly with low-power BMS processors without external level shifters. The receiver's 200 mV hysteresis rejects noise picked up on long cable runs through the building's wiring ducts. For battery-backed HVAC nodes, the SP3491EN-L/TR shutdown variant is preferred to drop quiescent current during sensor polling pauses. The RoHS-compliant SOIC-8 package supports reflow profiles up to 260°C peak, matching standard lead-free assembly lines.
تجویز کردہ
Point-to-Point RS-422 Links
RS-422 is widely used for long-distance, high-integrity point-to-point links between industrial equipment, surveillance cameras, and laboratory instruments. The SP3490EN-L/TR supports full-duplex RS-422 at 10 Mbps with the differential swing required by the EIA-422 standard. Its industrial temperature grade (-40°C to +85°C) lets it work in outdoor enclosures and factory floors without special screening. With 32 nodes it can also serve small multi-drop RS-422 chains, though pure RS-422 networks typically run point-to-point. Design tip: drive cables up to 1200 m at low data rates, but reduce cable length or add lower-skew drivers when running close to the 10 Mbps limit. A pair of SP3490EN-L/TR chips at each cable end forms a robust, 3.3V-only RS-422 link.
تجویز کردہ
Industrial PLC and Motor Drives
Programmable logic controllers and variable-frequency motor drives often expose RS-485 ports for SCADA and process-control links. The SP3490EN-L/TR offers 3.3V logic, 10 Mbps data, and ±2 kV ESD on the bus pins to handle the harsh electrical environment inside a motor-drive cabinet. Its short-circuit-protected driver outputs tolerate bus faults without latching up, while internal thermal shutdown protects the IC during sustained overcurrent events. Designers commonly place SP3490EN-L/TR between the PLC's CPU UART and the external bus connector, isolating the noisy power-section ground from the logic ground. Compared to optocoupler-isolated discrete solutions, the SP3490EN-L/TR + small signal-isolation transformer pair delivers equivalent reliability with much smaller PCB footprint.
تجویز کردہ
Sensor Networks and IoT Gateways
Low-power IoT gateways often collect data from remote sensors over RS-485 before forwarding to Wi-Fi, LoRa, or Ethernet uplinks. The SP3490EN-L/TR's 1 mA typical supply current keeps its contribution to system power budget minimal, and the 3.3V rail lets it share power directly with ESP32, nRF52, or Cortex-M0+ sensor hubs. With 10 Mbps headroom it can aggregate several high-update-rate sensor streams onto a single RS-485 trunk. The 32-node bus capacity supports field wiring for large sensor farms, and the receiver's 200 mV hysteresis rejects impulse noise from relay or solenoid coils in industrial settings. For battery-powered sensor nodes, pair the SP3490EN-L/TR with a MAX3490ESA+T variant that adds a shutdown pin to enter microamp sleep between transmissions.
تجویز کردہ
Point-of-Sale and Access Control Panels
POS terminals, electronic cash registers, and access-control panels frequently use RS-485 to interconnect peripherals such as barcode readers, receipt printers, and door controllers. The SP3490EN-L/TR offers 10 Mbps throughput to handle multi-peripheral traffic without bus contention, and its small SOIC-8 footprint suits compact POS enclosures. The 3.0V to 3.6V supply integrates with the 3.3V MCU domain used by most modern payment terminals, eliminating level shifters. The receiver's robust noise immunity (-7 V to +12 V common-mode range) tolerates ground potential differences between peripherals in large retail floors. Where cables extend outdoors (drive-thru terminals), the ±2 kV ESD rating provides valuable protection against static-discharge events during maintenance.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا SP3490EN-L/TR — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | SP3491EN-L/TR | SP3490EN-L | MAX3485ESA+T | MAX3490ESA+T | SN65HVD73DR | ADM3485EARZ |
|---|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | Maxim Integrated | Maxim Integrated | Texas Instruments | Analog Devices |
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Supply Voltage | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V |
| Data Rate | 10 Mbps | 10 Mbps | 10 Mbps | 10 Mbps | 10 Mbps | 20 Mbps | 10 Mbps |
| Duplex | Full | Full | Full | Full | Full | Full | Full |
| Number of Nodes | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| ESD Protection (bus) | ±2 kV HBM | ±2 kV HBM | ±2 kV HBM | ±15 kV HBM | ±15 kV HBM | ±16 kV HBM | ±15 kV HBM |
| Shutdown Pin | No | Yes | No | No | Yes | No | No |
اہم امتیازی خصوصیات
- BiCMOS process delivers 10 Mbps at 1 mA supply current (بمقابلہMAX1487E (legacy 5V half-duplex))
- Industry-standard pinout enables drop-in second sourcing (بمقابلہMAX3485ESA+T (Maxim))
- Higher data rate with same footprint (بمقابلہSN65HVD75DR (TI 1 Mbps part))
ڈیزائن نوٹس
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 8) and a bulk 10 µF tantalum or polymer cap on the same supply rail near the connector. Use a ground plane under the SOIC-8 footprint to keep the bus return path low-impedance; failure to do so can couple switch-mode noise into the receiver inputs and intermittently corrupt data at 10 Mbps.
Do not fail to terminate the bus: place a 120 Ω 1% resistor across A/Y and B/Z at each end of the cable to suppress ringing. Without termination, reflections can corrupt bytes at long cable lengths and data rates above 1 Mbps. Also avoid excessive stubs (T-taps) - keep stub length under one-tenth of the driver's rise time at the data rate used (about 30 cm at 10 Mbps).
Remember to tie /RE (pin 2) low and DE (pin 3) high during normal full-duplex operation; leaving them floating can cause intermittent bus errors on power-up. If the controller cannot drive both at once, tie /RE to ground through a 10 kΩ resistor and DE to VCC through a 100 kΩ pull-up, or simply ground /RE and Vcc-tie DE for permanently-enabled operation.
Keep the differential pair (A/Y, B/Z) tightly coupled and length-matched from the IC pins to the connector, ideally over a continuous ground plane. Route the pair away from switching regulator inductors or high-current traces to preserve the ±15 V common-mode range and prevent bus errors during motor-drive current transients.
تعمیل کی معلومات
RoHS compliant per JLCPCB and MaxLinear SP3490EN-L/TR EN-suffix ordering code (lead-free matte-tin plating). Industrial-grade temperature range -40°C to +85°C. No AEC-Q100 automotive qualification.
