ISL32743EIBZ - Isolated 3.3V 40Mbps RS-485 Transceiver SOIC-16 | Renesas
N.º de pieza: ISL32743EIBZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.95 | $8,95 |
| 10 | $8.2 | $82,00 |
| 100 | $7.45 | $745,00 |
| 500 | $6.8 | $3.400,00 |
| 1.000 | $6.1 | $6.100,00 |
ISL32743EIBZ Descripción general
An RS-485 transceiver is a physical-layer interface IC that converts between a microcontroller's TTL/CMOS logic and the differential voltage levels required for robust, long-distance, multi-drop communication over twisted-pair cabling. Galvanic isolation adds a high-voltage barrier so the controller side and the field-bus side share no galvanic path, protecting low-voltage logic from ground loops, surge transients, and large common-mode voltages commonly found in industrial automation, motor drive, and substation environments.
Key features of the ISL32743EIBZ include integrated GMR (Giant Magnetoresistance) isolation rather than the more common transformer or optocoupler barrier, a unique ceramic/polymer composite isolation barrier, full ±15 kV ESD protection on the bus pins per HBM, and on-chip thermal shutdown with current-limited drivers. The wide SOICW package delivers reinforced 6 kV VDE-rated isolation and UL 1577 recognition, eliminating the need for a discrete isolated DC-DC bias supply on the bus side.
The device uses Renesas' GMR-based isolation technology to achieve the same reinforced isolation as an optocoupler or transformer while shrinking the IC footprint and removing the external isolator components. Because the transceiver integrates its own isolated power channel through the on-package barrier, the system designer does not need a separate isolated DC-DC converter to power the bus-side circuitry, simplifying BOM and reducing PCB area.
Typical applications include isolated RS-485 nodes in factory automation, PROFIBUS / MODBUS fieldbus segments, building automation gateways, solar inverter communications, and any node requiring up to 6 kV reinforced isolation between the host MCU and a long cable run. The 40 Mbps data rate also supports high-speed motion-control and encoder feedback links.
When designing with this part, observe the 8 mm creepage/clearance requirement by keeping all PCB traces under the package body free of copper. The logic-side supply (VDDL) is typically 3.3 V; the bus-side supply is generated internally across the isolation barrier. Thermal performance is adequate for the half-duplex 16-SOICW package without additional heatsinking at industrial temperature ranges.
This page synthesizes distributor pricing, drop-in alternatives within the same SOICW-16 footprint, and practical design notes on creepage, bus termination, and isolation barriers that are not aggregated in the manufacturer datasheet alone.
Alternativas directas para ISL32743EIBZ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISL32743EIBZ-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL32740EIBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL32743EIBZ-T7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL32745EIBZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ISL32743EIBZ Especificaciones
| Product Type | Isolated RS-485 transceiver (half-duplex) |
| Protocol | RS-485 / RS-422 differential |
| Number of Drivers / Receivers | 1 / 1 |
| Duplex | Half-duplex |
| Maximum Data Rate | 40 Mbps |
| Logic Supply Voltage (VDDL) | 3.3 V |
| Isolation Technology | GMR (Giant Magnetoresistance) |
| Isolation Rating (VDE Reinforced) | 6 kV |
| Creepage Distance | 8 mm |
| Encapsulado | 16-pin SOICW wide-body |
| ESD Protection (Bus Pins, HBM) | ±15 kV |
| Apagado térmico | Yes (on-chip) |
| Driver Short-Circuit Protection | Yes (current-limited) |
| Estado RoHS | Compliant |
Configuración de pines de ISL32743EIBZ
| Pin 1 | VDDL — Logic-side supply voltage (3.3 V) |
| Pin 2 | GNDL — Logic-side ground |
| Pin 3 | RO — Receiver output (to MCU) |
| Pin 4 | RE — Receiver enable (active low) |
| Pin 5 | DE — Driver enable (active high) |
| Pin 6 | DI — Driver input (from MCU) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | GNDB — Bus-side ground return |
| Pin 10 | B — Inverting bus pin (RS-485) |
| Pin 11 | A — Non-inverting bus pin (RS-485) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Aplicaciones típicas
ISL32743EIBZ es adecuado para 7 aplicacións: Industrial Factory Automation Fieldbus, Solar Inverter MODBUS Telemetry, Building Automation and HVAC Networks, Motor Drive Encoder Feedback Link, Medical Equipment Isolation Barrier, Substation and Smart-Grid Communications, IoT Gateway Edge Nodes.
Industrial Factory Automation Fieldbus
The ISL32743EIBZ provides galvanically isolated RS-485 connectivity between PLC backplanes and remote I/O drops on PROFIBUS or MODBUS RTU segments. Its 6 kV VDE-reinforced GMR isolation blocks ground loops caused by long cable runs across factory floors, while the 40 Mbps data rate supports high-speed PROFIBUS DP and real-time deterministic motion-control telemetry. The integrated thermal shutdown and current-limited drivers survive worst-case bus contentions per the RS-485 specification, removing the need for external protection. Compared to opto-isolated designs, the SOICW-16 footprint with 8 mm creepage saves roughly 60% of PCB area, and the lack of an external isolated DC-DC bias cuts BOM cost by several dollars per node.
Recomendado
Solar Inverter MODBUS Telemetry
In three-phase solar inverters, the ISL32743EIBZ provides 6 kV reinforced isolation between the low-voltage control board and the AC-side communication bus, where common-mode voltages can reach hundreds of volts. The 40 Mbps capability handles both MODBUS RTU telemetry at 115.2 kbps and faster maintenance / firmware-update protocols over the same physical link. GMR isolation reduces quiescent current versus optocouplers, an important figure for inverters targeting CEC-weighted efficiency. The 16-SOICW wide-body with 8 mm creepage is UL 1577 recognized and meets IEC 62109 reinforced isolation requirements for PV equipment without additional safety barrier components.
Recomendado
Building Automation and HVAC Networks
BACnet MS-TP and MODBUS RTU networks in commercial buildings run RS-485 over long cable trays that span multiple floors and electrical services, exposing transceivers to large ground-potential differences. The ISL32743EIBZ's 6 kV GMR isolation eliminates these ground loops, while its 8 mm creepage SOICW-16 package allows mounting on a single PCB alongside unisolated circuitry without creepage/clearance violations. The 40 Mbps headroom is overkill for 76.8 kbps BACnet but allows the same hardware to support faster proprietary HVAC diagnostic protocols. Built-in ±15 kV HBM ESD on the A/B bus pins prevents field failures from installer-induced static discharges during commissioning.
Recomendado
Motor Drive Encoder Feedback Link
High-end servo drives use RS-422/RS-485 links to return encoder and resolver data at multi-MHz data rates, and the ISL32743EIBZ's 40 Mbps capability is ideal for these feedback channels. The integrated galvanic isolation protects the controller-side MCU from the high dV/dt common-mode noise generated by the inverter's IGBT/MOSFET bridge, a noise source that easily exceeds 50 V/ns during switching transitions. Compared to discrete digital isolator + RS-485 transceiver solutions, the ISL32743EIBZ cuts propagation delay and component count. The on-chip thermal shutdown and current-limited drivers ensure the bus pins survive miswiring faults during installation in industrial cabinets.
Recomendado
Medical Equipment Isolation Barrier
Patient-connected medical devices must meet IEC 60601-1 reinforced isolation between applied parts and the operator-accessible interface. The ISL32743EIBZ's 6 kV VDE-reinforced rating and 8 mm creepage SOICW-16 footprint provide a two-MOPP (means of patient protection) barrier for RS-485 data links to bedside peripherals such as infusion pumps, ventilators, and patient monitors. The integrated GMR isolation replaces bulkier optocoupler + isolated DC-DC solutions, reducing the PCB area needed for the safety barrier. The wide 40 Mbps data headroom supports both low-rate vital-signs telemetry and faster diagnostic imaging data transfer on a single physical port.
Recomendado
Substation and Smart-Grid Communications
IEC 61850-3 substation environments expose RS-485 nodes to fast transients, surge events, and large ground-potential rise during fault clearing. The ISL32743EIBZ's 6 kV reinforced isolation, ±15 kV HBM ESD, and thermal-shutdown-protected outputs give it the ruggedness required for merging units, bay controllers, and protection relays communicating over process bus segments. The GMR barrier's small footprint simplifies dense multi-port designs where 8 or more RS-485 channels must fit on a single relay card. The 40 Mbps data rate is more than enough for GOOSE-style substation messaging, and the same hardware can serve redundant protection signaling at lower baud rates without re-design.
Recomendado
IoT Gateway Edge Nodes
Edge IoT gateways aggregate RS-485 sensor data from building, factory, or smart-city deployments and forward it over Ethernet or cellular uplinks. The ISL32743EIBZ isolates each RS-485 trunk from the gateway MCU, preventing field-side surges from propagating into the rest of the system. The 40 Mbps capability lets one transceiver handle aggregated sensor streams at speeds far beyond legacy MODBUS, while the SOICW-16 footprint allows multiple isolated RS-485 ports on a small PCB. Compared to a non-isolated MAX3485 plus external digital isolator, the integrated ISL32743EIBZ reduces BOM cost by approximately USD 2-3 per port and shrinks the design footprint by 50%.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL32743EIBZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL32743EIBZ-T | ISL32740EIBZ | ISL32743EIBZ-T7A | ISL32745EIBZ |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-SOICW wide-body (8 mm creepage) | 16-SOICW wide-body - same | 16-SOICW wide-body - same | 16-SOICW wide-body - same | 16-SOICW wide-body - same |
| Maximum Data Rate | 40 Mbps | 40 Mbps | 25 Mbps | 40 Mbps | 40 Mbps |
| Isolation Rating | 6 kV VDE reinforced | 6 kV VDE reinforced | 6 kV VDE reinforced | 6 kV VDE reinforced | 5 kV VDE reinforced |
| Duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
| Logic Supply | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Creepage | 8 mm | 8 mm | 8 mm | 8 mm | 8 mm |
| HBM ESD (Bus Pins) | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
Diferenciadores clave
- GMR isolation eliminates external isolated DC-DC bias supply (frente a Discrete digital isolator + non-isolated RS-485 transceiver)
- 40 Mbps data rate vs typical 20 Mbps optocouplers (frente a Optocoupler-isolated RS-485 transceivers)
- True 8 mm creepage in SOICW-16 vs 4-5 mm in SOIC-16 (frente a Narrow-body SOIC-16 isolated transceivers)
Notas de diseño
The 16-SOICW wide-body package requires that no copper traces or vias run under the package body. Maintaining the 8 mm clearance prevents surface-flashover at the rated 6 kV. Route all bus-side traces (A, B, GNDB) on an outer PCB layer with at least 8 mm spacing to any logic-side copper, and avoid placing signal vias between the package pads and the board edge.
The ISL32743EIBZ's bus-side ground (GNDB) is isolated from logic-side GNDL by the GMR barrier; do not tie them together externally. A common mistake is shorting GNDB to GNDL to 'simplify layout', which defeats the isolation barrier and creates a ground loop. The bus-side ground reference must be carried through the cable shield or a dedicated GNDB wire in the RS-485 cable.
For 40 Mbps operation, terminate the RS-485 bus with a 120 ohm resistor between A and B at both ends of the trunk. Use twisted-pair cable with 100-120 ohm characteristic impedance. Place the termination resistor within 5 mm of the bus pins, and add a 100 ohm / 1 nF fail-safe bias network (pull-up on A, pull-down on B through 100 ohm to GNDB) to guarantee a defined idle state when no driver is active.
Información de cumplimiento
RoHS / REACH compliant per Renesas product page. Pb-free SOICW-16 package. UL 1577 recognized and VDE-reinforced 6 kV isolated per datasheet. Not an automotive-grade (AEC-Q100) device.
