IL485E - Isolated RS-485 Transceiver, 2.5 kV, 35 Mbps | NVE
N.º da peça: IL485E ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $11.84 | $11,84 |
| 10 | $10.65 | $106,50 |
| 100 | $9.5 | $950,00 |
| 500 | $8.42 | $4.210,00 |
| 1.000 | $7.55 | $7.550,00 |
IL485E Visão geral
Isolated RS-485 transceivers sit at the interface layer between a controller-side logic domain and a field-side bus domain, providing galvanic isolation that breaks ground loops and protects sensitive circuitry from high-voltage transients on long industrial cables. As a member of the RS-485 transceiver category, the IL485E combines a differential line driver/receiver pair with on-package isolation barriers, replacing discrete opto-coupler + transceiver designs with a single component. The part is also a member of the broader digital isolator and PROFIBUS-compatible transceiver families.
Key differentiating features include NVE's patented IsoLoop spintronic Giant Magnetoresistance (GMR) technology for the isolation barrier (instead of an optocoupler or silicon-oxide capacitive barrier), an integrated bus-fault detector, and PROFIBUS recognition for process-automation networks. The 20 kV/microsecond CMTI ensures reliable data transmission in noisy industrial environments with switching power stages. The wide-body 16-pin SOIC package provides the creepage and clearance required for 2.5 kV reinforced isolation per IEC 60747-17.
Architecturally, the IL485E uses GMR-based isolation to transmit the differential TXD/RXD logic across the isolation barrier, with the line-side die containing the EIA/TIA-485-B compliant line driver and receiver. The wide 0.3-inch (7.5 mm) SOIC body satisfies the 8 mm minimum creepage typically required for reinforced isolation at 250 Vrms working voltage.
Typical applications include isolated RS-485 nodes in factory automation (PROFIBUS DP, Modbus RTU), motor drive position feedback interfaces, substation communication (IEC 61850), building automation bus nodes, and any system where ground-potential differences between a host controller and field cabling would otherwise corrupt data. The 2.5 kV isolation also enables use in medical and test equipment where patient or operator isolation is required.
When designing with this part, observe the bus-termination, fail-safe biasing, and shield-grounding recommendations in the IL485 datasheet, and ensure the PCB provides the wide-body SOIC creepage/clearance footprint rather than a narrow-body footprint. Designers should also note the device does not include integrated DC-DC isolation power and requires separate isolated bias for the bus-side supply.
This page synthesizes distributor pricing, drop-in and same-family alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single decision-making reference for selecting the IL485E or its qualified substitutes.
Alternativas drop-in para IL485E — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
IL485
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
IL485WE
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
IL485E-3V
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
IL422E
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO1450DW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
IL485E Classificações máximas e características elétricas
| Manufacturer | NVE Corporation |
| Product Type | Isolated RS-485/RS-422 Differential Bus Transceiver |
| Isolation Technology | IsoLoop spintronic GMR (Giant Magnetoresistance) |
| Isolation Voltage (Vrms) | 2500 Vrms |
| Data Rate (max) | 35 Mbps (35 Mbd) |
| Common-Mode Transient Immunity (CMTI) | 20 kV/microsecond |
| Number of Channels | 3 (TX, RX, and bus-fault / handshake) |
| Bus ESD Protection | 2 kV |
| Standards Compliance | ANSI EIA/TIA-422-B, RS-485, PROFIBUS recognized |
| Encapsulamento | 16-pin wide-body SOIC (0.295 inch / 7.50 mm width) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead-Free | Yes |
| Fail-Safe Biasing | Bus-fault detection feature included |
Configuração de pinos do IL485E
| Pino 1 | VCC1 — Logic-side supply voltage |
| Pino 2 | GND1 — Logic-side ground |
| Pino 3 | TXD — Transmit data input (logic side) |
| Pino 4 | RXD — Receive data output (logic side) |
| Pino 5 | DE — Driver enable (logic side) |
| Pino 6 | RE — Receiver enable (logic side, active-low) |
| Pino 7 | NC — Not connected (per datasheet) |
| Pino 8 | NC — Not connected (per datasheet) |
| Pino 9 | GND2 — Bus-side ground |
| Pino 10 | VCC2 — Bus-side supply voltage |
| Pino 11 | A — Non-inverting bus driver output / receiver input |
| Pino 12 | B — Inverting bus driver output / receiver input |
| Pino 13 | Z — Inverting driver output (full-duplex) |
| Pino 14 | Y — Non-inverting driver output (full-duplex) |
| Pino 15 | FAULT — Bus-fault detection output |
| Pino 16 | VCC2 — Bus-side supply voltage (alt. pin) |
Aplicações típicas
IL485E é adequado para 7 aplicaçãos: PROFIBUS DP Factory Automation Node, Isolated Modbus RTU / RS-485 Field Bus, Motor Drive Encoder / Position Feedback Interface, Substation Communication (IEC 61850 / DNP3 over RS-485), Building Automation Bus Nodes (BACnet MS-TP, LonWorks), Medical Device Isolated Communication Port, Renewable Energy Inverter Communication.
PROFIBUS DP Factory Automation Node
The IL485E's 35 Mbps data rate and 2500 Vrms isolation make it a natural fit for isolated PROFIBUS DP master and slave nodes in factory automation. In a typical PROFIBUS segment running at 12 Mbps, the IL485E's headroom ensures clean signal integrity over long cable runs, while its 20 kV/microsecond CMTI rejects fast transients from adjacent motor drives and VFDs. The wide-body SOIC package provides the 8 mm creepage required for reinforced insulation at 250 Vrms working voltage in industrial cabinets.
Recomendado
Isolated Modbus RTU / RS-485 Field Bus
Modbus RTU runs on RS-485 differential signaling at up to 115 kbps (and up to 10 Mbps for Modbus TCP-over-serial variants), well within the IL485E's 35 Mbps envelope. The 2.5 kV isolation breaks ground loops between a host PLC and field instrumentation, while the bus-fault detection pin simplifies fail-safe biasing on floating bus segments. For 24 V industrial backbones, the IL485E provides reinforced isolation that protects controllers from field-side surges and ESD events up to 2 kV on the bus pins.
Recomendado
Motor Drive Encoder / Position Feedback Interface
AC and servo motor drives routinely place encoder and resolver feedback signals in electrically noisy environments with high dV/dt switching on the power stage. The IL485E's 20 kV/microsecond CMTI and GMR-based isolation ensure that RS-485 feedback data (e.g., BiSS, SSI, or ENDAT-over-RS-485) is not corrupted by switching noise from the IGBT bridge. The 35 Mbps rate supports modern high-resolution absolute encoders, and the wide-body SOIC footprint is industry-standard for reinforced motor-drive isolation.
Recomendado
Substation Communication (IEC 61850 / DNP3 over RS-485)
Substation IEDs (Intelligent Electronic Devices) communicate over RS-485 with IEC 61850 or DNP3 stacks, where the bus spans yards of cable and significant ground-potential differences. The IL485E's 2500 Vrms isolation exceeds the 1500 Vrms typically required for substation installations, and its PROFIBUS-recognized design pedigree supports utility-grade reliability. The wide-body SOIC's 8 mm creepage meets the reinforced-insulation spacing required by IEC 61850-3 for substation environments.
Recomendado
Building Automation Bus Nodes (BACnet MS-TP, LonWorks)
Building automation networks often run BACnet MS-TP or LonWorks over RS-485 across long runs of unshielded cable in commercial buildings. The IL485E's 35 Mbps ceiling and 2 kV bus ESD protection handle the cable-discharge events common when segments are wired or rewired during commissioning. The 2.5 kV isolation protects controller-side electronics from fault events on the building bus, and the wide-body SOIC package is compatible with standard HVAC controller PCB layouts.
Recomendado
Medical Device Isolated Communication Port
Medical devices such as patient monitors, infusion pumps, and diagnostic instruments often require isolated RS-485 ports for connection to hospital networks or service tools, with reinforced isolation to meet IEC 60601-1 patient-isolation requirements. The IL485E's 2500 Vrms galvanic isolation and GMR-based barrier (with low EMI emissions and stable propagation delay) provide a robust isolation solution. Its wide-body SOIC footprint is compatible with medical-grade PCB layouts that demand 8 mm creepage for 250 Vrms working voltage.
Recomendado
Renewable Energy Inverter Communication
Solar inverters and battery storage systems use isolated RS-485 links to communicate between string inverters, monitoring gateways, and DC-coupled battery management controllers. The IL485E's 20 kV/microsecond CMTI rejects the large dV/dt transients generated by the inverter's IGBT/MOSFET power stage, and the 2.5 kV isolation protects low-voltage monitoring electronics from high-voltage battery bus faults. Its 35 Mbps capability supports high-speed diagnostic data logging for fleet management.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para IL485E — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | IL485 | IL485WE | IL485E-3V | IL422E | ISO1450DW |
|---|---|---|---|---|---|---|
| Package | 16-pin wide-body SOIC (0.295 in) | 16-pin wide-body SOIC (0.295 in) | 16-pin wide-body SOIC (0.295 in) | 16-pin wide-body SOIC (0.295 in) | 16-pin wide-body SOIC (0.295 in) | 16-pin wide-body SOIC (DW) |
| Brand | NVE Corporation | NVE Corporation | NVE Corporation | NVE Corporation | NVE Corporation | Texas Instruments |
| Isolation Technology | GMR (IsoLoop) | GMR (IsoLoop) | GMR (IsoLoop) | GMR (IsoLoop) | GMR (IsoLoop) | Capacitive (SiO2) |
| PROFIBUS Recognized | Yes | Yes | Yes | Yes | Yes | No (RS-485 only) |
Principais diferenciais
- GMR-based IsoLoop isolation barrier with high CMTI (vs ISO1450DW (TI capacitive isolation))
- Highest isolation voltage in the IL485 family (vs IL485 (2000 Vrms))
- Integrated PROFIBUS recognition (vs ISO1450DW (TI))
- Three logic channels including bus-fault handshake (vs IL422E (lower-channel-count variant))
Notas de projeto
Use a wide-body SOIC-16 PCB footprint (0.295 in / 7.50 mm body width) for the IL485E, NOT a narrow-body SOIC-16 footprint. The wide body is required to provide the 8 mm minimum creepage and clearance for reinforced 2500 Vrms isolation per IEC 60747-17. Placing the part over a PCB cut-out or slot beneath the package increases effective creepage and is recommended for higher-altitude or pollution-degree-2 installations.
Route the logic-side and bus-side grounds (GND1, GND2) as separate return paths and join them only at one point near the system star-ground, otherwise high transient currents on the bus side can couple into the logic-side ground and corrupt data. Place 100 nF decoupling capacitors on both VCC1 and VCC2 as close to the IC pins as possible, with a 10 uF bulk capacitor on each supply rail. Estimated: with 35 Mbps signaling and 10 ns rise times, supply decoupling must hold impedance below 1 ohm up to 100 MHz.
Do not omit the bus-side fail-safe biasing resistors on A and B; without them, an idle bus floats and the IL485E's RXD output is undefined. Use the recommended 1.5 kohm pull-up on A and 1.5 kohm pull-down on B (or the bus-fault-detect feature) for proper RS-485 idle biasing. Also verify the bus cable shield is grounded at one end only to avoid ground loops, especially on long PROFIBUS segments. A tail tolerance of 120 ohm termination at the cable ends is mandatory for high-speed links.
The IL485E's GMR-based IsoLoop barrier generates far less EMI than opto-coupled RS-485 solutions, but the bus-side differential pair should still be routed as a 100 ohm differential transmission line with matched length and continuous ground reference. Keep the bus-side traces short and away from switching power nodes; a 4-layer stackup with a dedicated ground plane immediately below the bus traces provides the lowest EMI and best CMTI performance. For 35 Mbps operation, ensure total bus stub length is below 1/10 of the signal rise time in electrical length.
Informações de conformidade
RoHS and lead-free confirmed via DigiKey listing. Halogen-free status not stated in the verified web data and marked unknown. AEC-Q100 is not applicable - this part is not marketed as automotive-grade. PROFIBUS recognition granted per NVE datasheet.
