SP3490EN-L/TR - 3.3V Full-Duplex RS-485/RS-422 Transceiver | MaxLinear
Teilenummer: SP3490EN-L/TR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.34 | $1,34 |
| 10 | $1.12 | $11,20 |
| 100 | $0.86 | $86,00 |
| 500 | $0.71 | $355,00 |
| 1.000 | $0.62 | $620,00 |
SP3490EN-L/TR Übersicht
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.
Drop-in-Alternativen für SP3490EN-L/TR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SP3491EN-L/TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SP3490EN-L
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX3485ESA+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX3490ESA+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN65HVD73DR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADM3485EARZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SP485EEN-L/TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SP3490EN-L/TR Technische Daten
| Protocol Supported | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| Datenrate | 10 Mbps |
| Versorgungsspannung | 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) |
| Betriebstemperatur | -40 °C to +85 °C |
| Gehäuse | 8-SOIC (SOIC-8) |
| Montageart | Surface Mount |
| MSL-Level | 1 |
| RoHS-Status | Compliant |
| Process Technology | BiCMOS |
| Receiver Hysteresis | 200 mV (typical, per datasheet) |
SP3490EN-L/TR Pin-Konfiguration
| Pin 1 | RO — Receiver output (TTL/CMOS logic level to controller UART RX) |
| Pin 2 | /RE — Receiver enable, active-low (logic low enables RO output) |
| Pin 3 | DE — Driver enable, active-high (logic high enables driver outputs) |
| Pin 4 | DI — Driver input (TTL/CMOS logic level from controller UART TX) |
| Pin 5 | GND — Ground reference for logic and bus return |
| Pin 6 | A/Y — Driver non-inverting output / Receiver non-inverting input |
| Pin 7 | B/Z — Driver inverting output / Receiver inverting input |
| Pin 8 | VCC — 3.3V supply input (3.0V to 3.6V range) |
Typische Anwendungen
SP3490EN-L/TR ist geeignet für 7 Anwendungs: 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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SP3490EN-L/TR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | 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 |
Wichtigste Unterscheidungsmerkmale
- BiCMOS process delivers 10 Mbps at 1 mA supply current (vs. MAX1487E (legacy 5V half-duplex))
- Industry-standard pinout enables drop-in second sourcing (vs. MAX3485ESA+T (Maxim))
- Higher data rate with same footprint (vs. SN65HVD75DR (TI 1 Mbps part))
Designhinweise
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.
Compliance-Informationen
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.
