ISO1432DW - 12Mbps Isolated Full-Duplex RS-485/RS-422 Transceiver | TI
N.º de pieza: ISO1432DW ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.1 | $6,10 |
| 10 | $5.49 | $54,90 |
| 100 | $4.62 | $462,00 |
| 500 | $4.05 | $2.025,00 |
| 1.000 | $3.65 | $3.650,00 |
ISO1432DW Descripción general
An isolated RS-485 transceiver is a galvanically-isolated differential line driver/receiver designed for TIA/EIA-485-A and TIA/EIA-422-A applications. Within a system hierarchy, it sits at the interface between a low-voltage controller (MCU, FPGA, DSP) and a long-distance, noise-prone industrial bus. The isolation barrier blocks high-voltage transients, ground-potential differences, and common-mode noise that would otherwise couple into sensitive digital or analog circuitry upstream. By eliminating external optocouplers and isolated DC/DC converters (when paired with an integrated power isolator companion), the ISO1432 simplifies BOM, reduces board area, and improves reliability versus discrete implementations.
Key features include 5-kVrms reinforced isolation per UL 1577, 12 Mbps maximum signaling rate, 1/1 full-duplex topology with separate driver output (Y/Z) and receiver input (A/B) pins, integrated bus protection including IEC 61000-4-2 ESD (typically 8 kV contact / 15 kV air) and IEC 61000-4-4 electrical fast transient immunity, and a wide 3 V to 5.5 V supply range. The device operates across -40 °C to +125 °C, suiting outdoor, cabinet-mounted, and motor-drive environments. The 16-pin DW SOIC footprint provides a creepage/clearance distance consistent with reinforced insulation requirements, simplifying PCB layout for high-voltage spacing.
Internally, the ISO1432 uses TI's silicon-oxide (SiO2) capacitive isolation barrier combined with an RS-485 transceiver die on each side. The high-speed differential driver delivers 1.5 V minimum output swing into a 54 Ω load per TIA/EIA-485, while the receiver offers 50 mV typical hysteresis and a 1/8-unit-load input impedance (allowing up to 256 nodes on the bus when used with other 1/8-load parts). The EMC hardening includes spread-spectrum OOK signaling across the barrier and integrated surge protection on the bus pins, eliminating the need for external TVS diodes in many applications.
Typical applications include industrial programmable logic controllers (PLCs), factory automation and field-bus networks, motor-control inverter gate-driver communication, solar inverter H-bridge control interfaces, building-automation RS-485 trunks, and any microcontroller-to-bus interface requiring reinforced isolation. The wide temperature range also suits outdoor instrumentation and renewable-energy installations.
When designing with the ISO1432, allocate at least 8 mm of creepage on the PCB beneath and between the SOIC package sides to preserve the 5 kVrms rating, and pair the part with a wide-Vin isolated DC/DC (such as the ISOW1044 or ISOW1412 companion families) when the bus side must remain powered during MCU brownouts. Decouple both VCC1 and VCC2 with 1 µF X7R ceramic capacitors placed within 2 mm of the supply pins to keep digital switching currents off the isolation barrier.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Alternativas directas para ISO1432DW — 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:
ISO1432DWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO1432BDW
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO1412DW
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO1410BDW
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO1042DWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO1432DW Especificaciones
| Función | Transceiver, Isolated |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| Data Rate (max) | 12 Mbps |
| Isolation Voltage | 5000 Vrms (reinforced) |
| Supply Voltage (Vcc1, Vcc2) | 3 V to 5.5 V |
| Temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | 16-pin SOIC (DW) |
| Tipo de montaje | Surface Mount |
| UL Recognition | UL 1577 recognized |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de ISO1432DW
| Pin 1 | VCC1 — Logic-side supply voltage (3 V to 5.5 V) |
| Pin 2 | GND1 — Logic-side ground |
| Pin 3 | D — Driver input (TTL/CMOS) |
| Pin 4 | DE — Driver enable (active high) |
| Pin 5 | RE — Receiver enable (active low) |
| Pin 6 | R — Receiver output (TTL/CMOS) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | GND1 — Logic-side ground (pin 8) |
| Pin 9 | GND2 — Bus-side ground |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | A — Receiver non-inverting input |
| Pin 12 | B — Receiver inverting input |
| Pin 13 | Z — Driver inverting output |
| Pin 14 | Y — Driver non-inverting output |
| Pin 15 | VCC2 — Bus-side supply voltage (3 V to 5.5 V) |
| Pin 16 | GND2 — Bus-side ground (pin 16) |
Aplicaciones típicas
ISO1432DW es adecuado para 6 aplicacións: Industrial PLC and Factory Automation RS-485 Networks, Motor Drive Inverter Gate-Driver Communication, Solar Inverter H-Bridge Control Interface, Building Automation and HVAC Bus Trunks, Isolated Sensor and Instrumentation Data Links, Renewable Energy Battery Management Communication.
Industrial PLC and Factory Automation RS-485 Networks
The ISO1432DW is purpose-built for industrial PLC and factory-automation backbones where a 3.3 V MCU must communicate with a 5 V RS-485 trunk across a high-voltage isolation boundary. The 5 kVrms reinforced isolation per UL 1577 protects the controller from ground-potential differences and 24 V bus faults that are routine in motor-drive cabinets. Full-duplex 12 Mbps operation supports Profibus DP, high-baud Modbus RTU, and proprietary deterministic fieldbus protocols without timing penalties. In a typical deployment, the logic side (VCC1) is powered from the PLC's 3.3 V rail, and the bus side (VCC2) is fed from an isolated DC/DC such as the ISOW1044 or a discrete push-pull transformer driver. The driver outputs Y/Z drive the four-wire bus at 1.5 V minimum differential into 54 Ω, while the receiver inputs A/B accept 50 mV hysteresis signals from the far-end node. The 1/8-unit-load input impedance allows up to 256 transceivers on the bus. Designers should allocate at least 8 mm of PCB creepage under and between the SOIC body sides to preserve the reinforced rating.
Recomendado
Motor Drive Inverter Gate-Driver Communication
The ISO1432DW isolates the low-voltage control MCU from the high-voltage gate-driver stage in three-phase motor inverters and servo drives. The 5 kVrms barrier blocks dv/dt transients from IGBT/SiC switching that can reach 50 kV/µs, preventing latch-up and communication corruption in the digital control section. Full-duplex operation simultaneously transmits PWM commands and receives feedback telemetry across the same isolation boundary. At 12 Mbps, the ISO1432 comfortably handles the 50 kHz to 100 kHz PWM update rates typical of field-oriented control loops after SPI or UART serialization. The -40 °C to +125 °C operating range covers the cabinet ambient plus self-heating margin in enclosed drives. Place VCC1 and VCC2 decoupling capacitors within 2 mm of the supply pins and maintain 8 mm of creepage along the SOIC edges to preserve the reinforced insulation rating across the high-voltage section.
Recomendado
Solar Inverter H-Bridge Control Interface
Photovoltaic string inverters and battery-storage H-bridges use the ISO1432DW to isolate the DSP/MCU control plane from the high-voltage DC bus side. The 5 kVrms reinforced isolation is required to satisfy IEC 62109 safety standards for PV equipment, while the 12 Mbps data rate supports high-speed telemetry such as MPPT loop updates, grid-synchronization status, and DC-bus voltage feedback at sub-millisecond cadence. The full-duplex topology enables simultaneous command and feedback across the same isolated link without bus turnaround latency, which is critical for grid-tie phase-lock loops. EMC hardening to IEC 61000-4-2 ESD and IEC 61000-4-4 EFT keeps the bus pins intact during nearby lightning-induced surges and inverter switching transients. Operating across -40 °C to +125 °C, the part tolerates outdoor enclosure temperatures in direct-sunlight rooftop installations.
Recomendado
Building Automation and HVAC Bus Trunks
The ISO1432DW serves as the isolated transceiver on building-automation trunks carrying BACnet MS/TP, Modbus RTU, or proprietary HVAC protocols over RS-485. The 5 kVrms isolation protects low-voltage thermostats, BACnet controllers, and access-control panels from transients on long cable runs that traverse multiple floors and electrical zones, where ground-potential differences of tens of volts are common. Full-duplex 12 Mbps operation supports modern BACnet/IP gateways and high-speed Modbus concentrators, while 1/8-unit-load input impedance permits up to 256 nodes on a single trunk - sufficient for large commercial installations. The integrated EMC hardening (IEC 61000-4-2 ESD and IEC 61000-4-4 EFT) eliminates external TVS diodes in most designs, reducing BOM cost on multi-node deployments. The wide supply range accepts both 3.3 V MCU rails and 5 V bus-side power from isolated converters.
Recomendado
Isolated Sensor and Instrumentation Data Links
Process-control transmitters and weigh-scale digitizers use the ISO1432DW to bridge a 4-20 mA loop, load cell, or strain-gauge digitizer back to a safe-area controller. The 5 kVrms reinforced isolation is mandatory in field-mounted instruments connected to mains-powered controllers, where fault propagation must be prevented. Full-duplex 12 Mbps enables simultaneous upload of calibration data and download of commands without bus contention. The receiver's 50 mV typical hysteresis and 1/8-unit-load input impedance are well-matched to long twisted-pair runs across industrial floors. Integrated EMC immunity to IEC 61000-4-2 and IEC 61000-4-4 removes the need for external bus-pin protection in most IEC 61326-1 industrial-emission environments. The -40 °C to +125 °C range supports outdoor field-mount enclosures and unheated cabinets in cold-climate plants.
Recomendado
Renewable Energy Battery Management Communication
Battery-management systems (BMS) in residential and commercial energy-storage racks use the ISO1432DW to isolate the cell-monitoring MCU stack from the high-voltage battery bus and the inverter-side controller. The 5 kVrms reinforced isolation is essential to satisfy IEC 62619 and UL 1973 safety requirements for lithium-ion battery installations, while 12 Mbps full-duplex throughput supports cell-balancing telemetry, state-of-charge updates, and fault reporting at the millisecond cadence required for fast-acting protection. EMC hardening against IEC 61000-4-2 ESD and IEC 61000-4-4 EFT ensures robust operation in the electrically noisy environment adjacent to switching power converters. The wide 3 V to 5.5 V supply range accepts both 3.3 V MCU rails and 5 V bus-side power, simplifying dual-rail designs. Across the -40 °C to +125 °C range, the part tolerates outdoor cabinet temperatures and battery-cabinet self-heating during high-charge/discharge cycles.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISO1432DW — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISO1432DWR | ISO1432BDW | ISO1412DW | ISO1410BDW | ISO1042DWR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-pin SOIC (DW) | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same |
| Function | Isolated RS-485/RS-422 transceiver | Isolated RS-485/RS-422 transceiver | Isolated RS-485/RS-422 transceiver | Isolated RS-485/RS-422 transceiver | Isolated RS-485 transceiver | Isolated CAN transceiver |
| Duplex | Full | Full | Full | Full | Half | Half (CAN) |
| Drivers / Receivers | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Diferenciadores clave
- Full-duplex 1/1 topology in a 16-pin SOIC (frente a ISO1410BDW)
- 12 Mbps maximum data rate (frente a ISO1042DWR)
- Integrated EMC hardening for IEC 61000-4-2 ESD and IEC 61000-4-4 EFT (frente a ISO1412DW)
Notas de diseño
Estimated: To preserve the 5 kVrms reinforced insulation rating, allocate at least 8 mm of creepage and clearance on the PCB beneath and between the two sides of the SOIC (DW) package. Avoid copper pours, vias, and signal traces that bridge the isolation gap. The 16-pin DW body extends approximately 10 mm across, so a 4-layer board with internal cutouts under the part is the cleanest way to maintain the safety boundary. Without proper creepage, the actual withstand voltage drops well below 5 kVrms even though the IC datasheet rating is unchanged.
Decouple both VCC1 (pin 1) and VCC2 (pin 15) with 1 µF X7R ceramic capacitors placed within 2 mm of the respective supply pins. The isolation barrier draws small switching currents during high-speed data transitions; without local bulk capacitance these currents circulate through the system ground and can corrupt nearby analog or RF circuitry. A 0.1 µF X7R in parallel with the 1 µF suppresses high-frequency noise above 10 MHz. If VCC2 is sourced from an isolated DC/DC such as the ISOW1044, place an additional 10 µF tantalum or polymer cap at the DC/DC output to absorb load-step transients.
Do not route the bus-side differential traces (Y/Z, A/B) directly beneath the isolation gap, as capacitive coupling across the barrier can inject common-mode noise into the logic-side supply. Use a 100 Ω differential termination at the cable ends, not at the IC, to prevent reflection-induced ringing at 12 Mbps over long cables. Avoid tying DE high and RE low simultaneously if firmware writes to the receiver output R, since the driver output will be enabled while the receiver monitors the bus - this is correct for full-duplex but causes bus contention on a half-duplex variant. Always verify that VCC2 ramps before or with VCC1 to avoid an undefined state on the receiver output during power-up sequencing.
Información de cumplimiento
UL 1577 recognized for reinforced insulation up to 5000 Vrms. RoHS and REACH compliant per TI product page. AEC-Q100 not qualified - this part is targeted at industrial applications, not automotive. For automotive isolated RS-485, evaluate ISO1042 with Q1 suffix.
