MAX3490AEGSA+ - 3.3V 20Mbps RS-485/RS-422 Transceiver | Analog Devices
Référence : MAX3490AEGSA+ ✓ ActifMAX3490AEGSA+ Présentation
An RS-485/RS-422 transceiver is an interface IC that converts digital logic-level signals into differential cable signals and receives differential cable signals back into digital logic. The MAX3490AEGSA+ operates in the voltage-regulator hierarchy of industrial communications: it sits between a host controller, such as a UART or processor, and a physical RS-485 or RS-422 cable. Differential signaling improves noise immunity over longer cable runs and allows reliable communication between separated equipment.
The MAX3490AEGSA+ family is designed for 3.3V operation and provides 20Mbps maximum data rate with slew-rate-limited drivers. The ±20kV ESD protection helps improve robustness when cables are exposed to electrostatic discharge during installation or operation. Its full-duplex configuration provides separate transmit and receive paths, which is useful when the design requires continuous communication in both directions rather than a shared half-duplex bus.
The device is supplied in an 8-pin SOIC package, allowing direct assembly into conventional surface-mount PCB layouts. The MAX3490AEGSA+ family is identified by Analog Devices as a production 3.3V-powered, slew-rate-limited, true RS-485/RS-422 transceiver. The related MAX3490AE page lists a 10Mbps product family overview, while the MAX3490AEGSA+ listing identifies the 20Mbps-rated version.
Typical applications include industrial PLC-to-PLC links, factory-floor data acquisition, building automation, security equipment, and embedded instrumentation. When designing the interface, provide correct termination, biasing, common-mode protection, and cable routing according to the system topology. The differential pair should be routed as a controlled-impedance pair, with protection and ground-return arrangements evaluated for the installation environment.
This page combines the manufacturer product information with distributor listings and application-oriented engineering guidance. It also organizes the device's RS-485/RS-422 role, electrical limits, package details, replacement considerations, and practical layout practices into a concise selection reference for engineers.
Alternatives de remplacement direct pour MAX3490AEGSA+ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX3490AEGSA+ (même facteur de forme et même empreinte) — différant par ESD Protection, Maximum Data Rate, Product Type, Supply Voltage.
MAX3490ECSA-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3485ECSA+
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX3488AEASA+T
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX3483AEASA+T
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX3490AEGSA+T
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX3490AEGSA+ Spécifications
| Product Type | Full-duplex RS-485/RS-422 transceiver |
| Tension d'alimentation | 3.3 V nominal |
| Operating Supply Range | 3.0 V to 3.6 V |
| Maximum Data Rate | 20 Mbps |
| Driver Configuration | Slew-rate-limited |
| ESD Protection | ±20 kV |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Communication Mode | Full duplex |
| Supported Standards | RS-485 and RS-422 |
| Boîtier | 8-pin SOIC |
| Type de montage | Surface mount |
| Manufacturer | Analog Devices / Maxim Integrated |
| Product Lifecycle | Production |
Guide de configuration des broches du MAX3490AEGSA+ 8-pin soic
Configuration des broches du MAX3490AEGSA+ (boîtier 8-pin soic). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour MAX3490AEGSA+.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX3490AEGSA+ convient pour 6 applications: Industrial PLC Communication, Factory Automation Data Links, Building Automation Networks, Security and Surveillance Equipment, Precision Instrumentation, Embedded Industrial Gateways.
Industrial PLC Communication
The MAX3490AEGSA+ fits full-duplex point-to-point links between industrial controllers, remote I/O stations, and supervisory equipment. Its 3.0V to 3.6V operating range integrates with 3.3V digital systems, while the 20Mbps capability supports communication rates above slow serial-control speeds. The ±20kV ESD protection is useful on field-facing cable connections where electrostatic discharge may occur during installation or maintenance. Use differential routing, appropriate termination, and a grounded enclosure to preserve noise immunity across industrial cable runs.
Recommandé
Factory Automation Data Links
Use the MAX3490AEGSA+ when a factory automation subsystem needs a robust differential communication path between a controller and a remote actuator, sensor, or drive interface. Its slew-rate-limited driver reduces high-frequency edge energy, helping limit EMI and reflections on correctly terminated links. The 3.3V supply is appropriate for contemporary embedded control hardware. At 20Mbps, verify cable attenuation, grounding, and receiver timing over the actual plant distance rather than relying only on the headline data-rate rating.
Recommandé
Building Automation Networks
The MAX3490AEGSA+ can connect building controllers, room units, access-control equipment, and monitoring modules over a differential RS-422 or RS-485 link. Its full-duplex arrangement is useful when both ends need to transmit independently, while the low 3.3V supply simplifies integration with modern controller boards. ESD protection strengthens the field-connected interface, but surge protection, cable segregation, and proper common-mode handling may still be required for installations with long outdoor cable runs.
Recommandé
Security and Surveillance Equipment
The MAX3490AEGSA+ is appropriate for linking a camera controller, access-control reader, or alarm panel to a remote monitoring station over a balanced serial line. The 20Mbps maximum rate provides headroom for burst-oriented telemetry and configuration traffic, while the ±20kV ESD rating helps protect the interface from discharge events associated with field cables. Maintain separation from switching-power and motor wiring, and include surge protection when the cable leaves the controlled enclosure.
Recommandé
Precision Instrumentation
Instrumentation systems can use the MAX3490AEGSA+ to connect a measurement controller to remote sensors, programmable power equipment, or laboratory interfaces. Differential signaling reduces susceptibility to common-mode noise, while slew-rate limiting helps control cable edge rates. The device's 3.3V operation supports modern mixed-signal and embedded designs. For sensitive measurement nodes, separate the transceiver supply from analog sections, use careful grounding, and evaluate whether the selected data rate and cable length introduce excessive signal degradation.
Recommandé
Embedded Industrial Gateways
The MAX3490AEGSA+ suits gateway boards that convert between a host processor and older RS-485 or RS-422 field equipment. Its one-driver/one-receiver full-duplex arrangement simplifies point-to-point links and can support a second transceiver for a multidrop bus when required. The 8-pin SOIC package is compact and easy to route on a mixed-signal gateway PCB. Confirm enable polarity, receiver thresholds, fail-safe behavior, and termination against the host interface before finalizing the schematic.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX3490AEGSA+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX3490ECSA-T | MAX3485ECSA | MAX3488AEASA+T | MAX3483AEASA+T |
|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Supported Standards | RS-485 and RS-422 | RS-485/RS-422 family | RS-485/RS-422 family | RS-485/RS-422 family | RS-485/RS-422 family |
Principaux différenciateurs
- High-speed 3.3V differential interface capability (vs MAX3483AEASA+T)
- Full-duplex transceiver arrangement (vs MAX3485ECSA)
- Field-facing ESD protection (vs MAX3490ECSA-T)
Notes de conception
Route the RS-485 or RS-422 differential pair as a matched pair with continuous reference to the appropriate ground plane. Keep the trace geometry consistent, avoid stubs, and place the transceiver close to the cable-entry protection network. Check the manufacturer's recommended layout and keep switching-regulator loops and high-current traces away from the differential pair.
The slew-rate-limited driver reduces fast edge energy, but the cable still requires correct termination and topology. For point-to-point RS-422 links, use the termination arrangement recommended for the cable impedance. For multidrop RS-485 buses, place termination only at the physical ends and use biasing to keep the bus in a valid state when no driver is active.
Do not treat the 20Mbps headline rating as a universal distance specification. At high rates, cable loss, connector transitions, grounding, common-mode voltage, and timing margins can become limiting factors. Confirm the complete interface with the intended cable, connectors, baud rate, and termination before production release.
Keep the transceiver, protection components, and connector interface in the same controlled return path. Place any common-mode or surge-protection devices at the cable entry and connect their return terminals to the chassis or ground strategy used by the enclosure. Avoid long unprotected traces between the connector and the MAX3490AEGSA+.
Informations de conformité
The product family is identified as a production Analog Devices transceiver. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals statements require confirmation from the current manufacturer documentation.