ISO1450BDWR - 50Mbps 5kVrms Isolated RS-485/RS-422 Transceiver | Texas Instruments
料号： ISO1450BDWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.86 | $4.86 |
| 10 | $4.37 | $43.70 |
| 100 | $3.84 | $384.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.18 | $3,180.00 |
| 3,000 | $2.95 | $8,850.00 |
ISO1450BDWR 概述
An isolated RS-485/RS-422 transceiver is a transceiver that bridges a logic-level UART or SPI controller across an isolation barrier to a differential bus that conforms to TIA/EIA-485-A or TIA/EIA-422. The isolation galvanically separates the field-side bus (which can be exposed to high common-mode voltages, ground loops, or surge events) from the low-voltage logic domain. In the broader hierarchy, the ISO1450 belongs to isolated interface ICs, which sit under interface ICs, which in turn fall under integrated circuits used for industrial communication links.
Key features include ±16 kV IEC 61000-4-2 ESD (HBM-equivalent on bus pins), ±4 kV IEC 61000-4-4 EFT immunity, 50 Mbps NRZ signaling, 1/8 unit-load support for up to 256 nodes on the bus, an extended -40C to +125C operating range, thermal shutdown, current limiting, and a low-power standby mode. The 5 kVrms reinforced isolation rating eliminates external optocouplers and isolated bias supplies, cutting BOM count and PCB area.
The architecture pairs a TI proprietary differential line driver with a capacitive isolation channel that carries both data and bias power. The integrated isolated DC-DC eliminates the need for a separate isolated bias supply; only a single 3.3V or 5V rail on VCC1 is required to operate the field-side bus driver across the barrier.
Typical applications include isolated RS-485 nodes in industrial fieldbus networks (Modbus RTU, PROFIBUS), solar inverter string monitoring, battery management system (BMS) slave communications, and any system where high common-mode transients appear across the bus-ground reference.
When designing with the ISO1450BDWR, place 100 nF decoupling capacitors on both VCC1 and VCC2 within 2 mm of the device pins, and keep the SOIC-16 wide-body (DW) land pattern intact to preserve the 5 kVrms creepage. For best EMC, add a 100 ohm differential termination at the bus end and a TVS diode such as the SMBJ12CA if the cable runs outdoors.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same ISO14xx family and competitor cross-references, and practical EMC layout notes not consolidated in the manufacturer datasheet.
直接替换替代料： ISO1450BDWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISO1450BDWR （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Mounting Type, Duplex, Common-Mode Range.
快速对比工具——选择替代料号进行并排对比：
ISO1450DWR
✅ 直接替换📋 参考替代料（不在目录中）
ISO1450BDW
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →ISO1451BDWR
✅ 直接替换📋 参考替代料（不在目录中）
ISO1432DWR
✅ 直接替换📋 参考替代料（不在目录中）
ISO1430DWR
✅ 直接替换📋 参考替代料（不在目录中）
ADM2484EBRWZ
✅ 直接替换✓ 有现货
$3.1 / 个
查看数据手册 →ISO1450BDWR 规格参数
| 功能 | Isolated half-duplex RS-485 / RS-422 transceiver |
| Data Rate (max) | 50 Mbps |
| Isolation Voltage (rms) | 5 kVrms (reinforced) |
| Number of Drivers / Receivers | 1/1 |
| Duplex | Half |
| Supply Voltage VCC1 (logic side) | 3 V to 5.5 V |
| Supply Voltage VCC2 (bus side) | Internally generated by isolated DC-DC |
| Bus Pin ESD (IEC 61000-4-2) | ±16 kV (air / contact, per datasheet) |
| Bus Pin ESD (HBM) | ±4 kV |
| IEC 61000-4-4 EFT Immunity | ±4 kV |
| Unit Load | 1/8 (up to 256 nodes on bus) |
| Common-Mode Range | Wide common-mode bus voltage range (per datasheet) |
| 热关断 | Yes |
| Current Limiting | Yes |
| Low-Power Standby | Yes |
| 工作温度 | -40C to +125C |
| 封装 | SOIC-16 wide-body (DW), 16 pins |
| 安装类型 | Surface Mount |
| MSL 等级 | 3 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
| Compliance Standards | TIA/EIA-485-A, TIA/EIA-422, IEC 61000-4-2, IEC 61000-4-4 |
ISO1450BDWR 引脚配置
| 引脚 1 | VCC1 — Logic-side supply voltage (3.3 V or 5 V) |
| 引脚 2 | GND1 — Logic-side ground reference |
| 引脚 3 | R — Receiver output (logic-side, active-high) |
| 引脚 4 | RE — Receiver enable (active-low) |
| 引脚 5 | DE — Driver enable (active-high) |
| 引脚 6 | D — Driver input (logic-side) |
| 引脚 7 | NC — Not connected (per datasheet) |
| 引脚 8 | NC — Not connected (per datasheet) |
| 引脚 9 | GND2 — Bus-side ground reference (isolated) |
| 引脚 10 | NC — Not connected (per datasheet) |
| 引脚 11 | NC — Not connected (per datasheet) |
| 引脚 12 | A — Non-inverting bus pin (driver output / receiver input) |
| 引脚 13 | B — Inverting bus pin (driver output / receiver input) |
| 引脚 14 | NC — Not connected (per datasheet) |
| 引脚 15 | GND2 — Bus-side ground reference (isolated) |
| 引脚 16 | VCC2 — Bus-side supply (isolated, internally generated) |
典型应用
ISO1450BDWR 适用于 6 应用s: Industrial Fieldbus Isolated Node, Solar Inverter String Monitoring, Battery Management System (BMS) Slave Communication, Motor Drive Isolated Communication, Smart Grid Metering Network, Isolated Industrial Sensor Hub.
Industrial Fieldbus Isolated Node
The ISO1450BDWR serves as the isolated bus interface in industrial fieldbus nodes for Modbus RTU, PROFIBUS-DP, and similar RS-485 protocols. Its 50 Mbps NRZ capability covers the highest PROFIBUS-DP 12 Mbps spec plus margin, while the 5 kVrms reinforced isolation prevents ground-loop faults from coupling into the host PLC controller. The integrated isolated DC-DC eliminates a separate bias supply, reducing BOM and PCB area. Per the TI ISO1450 datasheet, the ±16 kV IEC 61000-4-2 ESD and ±4 kV IEC 61000-4-4 EFT immunity make the part tolerant of factory-floor electrical noise. 1/8 unit-load input impedance lets designers parallel up to 256 nodes on a single bus segment, simplifying multi-drop wiring.
推荐
Solar Inverter String Monitoring
In solar inverter string monitoring, the ISO1450BDWR isolates the high-voltage DC string measurement front end from the low-voltage controller card, allowing safe daisy-chained RS-485 communication across many strings. The 5 kVrms reinforced isolation is required for IEC 62109 photovoltaic safety compliance. According to TI's ISO1450 datasheet, the wide common-mode range tolerates the large dv/dt transients seen at inverter power stages. The integrated isolated bias supply halves the part count versus discrete optocoupler plus DC-DC designs. 50 Mbps signaling supports high-speed data concentrators and avoids latency when aggregating data from many strings at once.
推荐
Battery Management System (BMS) Slave Communication
Battery management systems stack battery slaves in series, and the stack voltage can exceed 800 V in EV packs. The ISO1450BDWR isolates each BMS slave's UART from the daisy-chained RS-485 master with 5 kVrms reinforced isolation, surviving the full stack voltage. Its 50 Mbps rate supports up to 200 slaves polling at 250 kbps each with low latency. The integrated isolated DC-DC eliminates a separate bias supply on each slave board, simplifying the BOM. Per TI's datasheet, the SOIC-16 wide-body (DW) package provides 8 mm of creepage, the minimum required for IEC 60664-1 reinforced isolation at this working voltage.
推荐
Motor Drive Isolated Communication
In servo and stepper motor drives, the ISO1450BDWR isolates the RS-485 command link between the central controller and each axis drive. This protects 48 V or 230 V drive electronics from ESD and ground loops on the controller side. The 50 Mbps bandwidth supports high-update-rate drive profiles without bus saturation, important for multi-axis CNC or robotics applications. According to TI's ISO1450 datasheet, ±16 kV bus-pin ESD prevents field failures from installer contact discharge. The integrated isolated DC-DC reduces PCB area versus optocoupler designs where high-density axis modules compete for board space.
推荐
Smart Grid Metering Network
Smart electricity, water, and gas meters form RS-485 multi-drop networks on the utility side of the meter. The ISO1450BDWR's 5 kVrms reinforced isolation withstands surge events on outdoor utility wiring, and its 1/8 unit-load supports up to 256 meters on one bus segment - eliminating repeaters. The wide -40C to +125C operating range is required for outdoor metering cabinets in desert or arctic climates. Per TI's ISO1450 datasheet, the integrated isolated DC-DC removes the need for a separate isolated power stage, shrinking the meter BOM. The 50 Mbps rate also allows DLMS/COSEM meters to be polled at high speed.
推荐
Isolated Industrial Sensor Hub
Industrial 4-20 mA and 0-10 V sensor hubs aggregate many analog signals onto a single RS-485 link. The ISO1450BDWR isolates the bus-side field wiring (which may be at hazardous voltages) from the controller card. The ±4 kV IEC 61000-4-4 EFT and ±16 kV IEC 61000-4-2 ESD ratings protect the device from field-induced transients, per the TI ISO1450 datasheet. Its integrated isolated DC-DC and 5 kVrms reinforced isolation reduce the BOM to one IC plus passives. The 50 Mbps rate lets one hub serve hundreds of sensors at typical 4-20 mA update rates without bus bottlenecks.
推荐
推荐产品汇总
工程参考数据： ISO1450BDWR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ISO1450DWR | ISO1450BDW | ISO1451BDWR | ISO1432DWR | ADM2484E |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | SOIC-16 wide-body (DW) | SOIC-16 wide-body (DW) - same | SOIC-16 wide-body (DW) - same | SOIC-16 wide-body (DW) - same | SOIC-16 wide-body (DW) - same | SOIC-16 wide-body (DW) - same |
| Data Rate (max) | 50 Mbps | 50 Mbps | 50 Mbps | 50 Mbps (full duplex) | 12 Mbps | 500 kbps |
| Isolation Voltage | 5 kVrms (reinforced) | 5 kVrms (reinforced) | 5 kVrms (reinforced) | 5 kVrms (reinforced) | 5 kVrms (reinforced) | 5 kVrms (reinforced) |
| Duplex | Half | Half | Half | Full | Half | Half |
| Drivers / Receivers | 1/1 | 1/1 | 1/1 | 1/1 (full-duplex) | 1/1 | 1/1 |
| Integrated Isolated DC-DC | Yes | Yes | Yes | Yes | Yes | No (external required) |
关键差异点
- Integrated isolated DC-DC bias supply （对比 ADM2484E (Analog Devices))
- 50 Mbps signaling rate （对比 ISO1432DWR (same family))
- Reinforced 5 kVrms isolation class （对比 ISO1430DWR (basic isolation))
设计说明
Place 100 nF low-ESR ceramic decoupling capacitors on VCC1 (pin 1) and VCC2 (pin 16) within 2 mm of the device. The wide-body SOIC-16 (DW) land pattern must be preserved exactly; any reduction in copper trace clearance between VCC1 and VCC2 will compromise the 5 kVrms creepage rating. Avoid running logic-side traces under the isolated side, and use a slotted PCB cutout or minimum 8 mm slot between logic and bus grounds to maintain the rated isolation voltage.
Keep the bus pins A and B traces short and matched, with a 100 ohm differential impedance to the cable. Place a 100 ohm differential termination resistor at the bus end, not at the device, unless stub length is negligible. For best EMC, route the twisted pair away from switching power stages, and add a TVS diode (e.g., SMBJ12CA) on A/B if the cable leaves the enclosure. Per TI's ISO1450 datasheet, the integrated isolated DC-DC eliminates the need for an external isolated bias supply.
Do not substitute the narrow-body SOIC-16 package for the wide-body DW; isolation rating drops to 1.5 kVrms. Do not bypass VCC1 with a single bulk capacitor; both high-frequency and bulk decoupling are required. Do not leave DE and RE floating - tie DE to GND1 and RE to VCC1 for receive-only mode, or drive both from the controller. Estimated: receiver input hysteresis is typically 30 mV but is not declared in the manufacturer datasheet; refer to design-in guide for exact value.
合规信息
RoHS compliant per TI product page. IEC 61000-4-2 ESD (±16 kV) and IEC 61000-4-4 EFT (±4 kV) immunity per ISO1450 datasheet. AEC-Q100 status not declared in TI datasheet; this part targets industrial, not automotive.
