ISO1410 vs ISO1430: Choosing the Right Isolated RS-485/RS-422 Transceiver
Side-by-side comparison of TI ISO1410 and ISO1430 isolated RS-485/RS-422 transceivers covering data rate, isolation, half/full duplex, and supply chain.
Last updated: June 2026
Introduction
When designing industrial networks, choosing the right isolated RS-485/RS-422 transceiver can determine system reliability, compliance margins, and long-term cost. Texas Instruments' ISO1410 and ISO1430 families both deliver galvanic isolation with RS-485/RS-422 signaling, yet they diverge in key electrical parameters, package options, and target applications. This article gives hardware engineers a side-by-side technical breakdown so you can pick the right device the first time.
Quick Comparison Table
| Parameter | ISO1410 (ISO1410BDW / ISO1410BDWR / ISO1410DWR) | ISO1430 (ISO1430BDW / ISO1430DW / ISO1430DWR) |
|---|---|---|
| Interface Standard | RS-485 / RS-422 | RS-485 / RS-422 |
| Isolation Technology | Capacitive (Silicon Dioxide) | Capacitive (Silicon Dioxide) |
| Isolation Voltage (Basic) | 2500 VRMS | 2500 VRMS |
| Isolation Voltage (Reinforced) | 5000 VRMS (BDW) | 5000 VRMS (BDW) |
| Max Data Rate | 500 kbps | 20 Mbps |
| Supply Voltage (VCC1 / VCC2) | 3.0 V–5.5 V / 3.0 V–5.5 V | 3.0 V–5.5 V / 3.0 V–5.5 V |
| Half / Full Duplex | Half-duplex | Full-duplex (ISO1430) |
| Number of Channels | 1 transceiver | 1 transceiver |
| Bus Fault Protection | ±70 V | ±70 V |
| Packages Available | SOIC-16 (DW, DWR) | SOIC-16 (DW, DWR) |
| Certifications | IEC 60950-1, VDE | IEC 60950-1, VDE |
| Typical Price Range | ~$2.50–$4.00 USD (volume) | ~$3.00–$5.50 USD (volume) |
Detailed Analysis
1. Data Rate and Protocol Fit
The most significant differentiator between the two families is maximum data rate. The ISO1410 family tops out at 500 kbps, which is adequate for Modbus RTU, DNP3, and low-speed PROFIBUS nodes operating at standard baud rates (9600 bps to 115.2 kbps). Industrial control loops running at these rates have no need for extra bandwidth, and the ISO1410's slower rise/fall times actually reduce EMI on long cable runs.
The ISO1430, by contrast, supports up to 20 Mbps—40 times faster. This headroom makes it suitable for high-speed RS-422 applications such as encoder interfaces, high-speed serial links to FPGAs, motion controllers, and high-density I/O expansion boards. If your design must eventually support RS-422 at 10 Mbps for servo feedback, the ISO1430 is the only viable choice in this family.
2. Isolation Scheme: Basic vs. Reinforced
Both families offer two certification tiers:
- Standard variants (ISO1410DWR, ISO1430DW, ISO1430DWR): 2500 VRMS working isolation, suitable for IEC 60950-1 basic isolation requirements.
- Reinforced variants (ISO1410BDW, ISO1410BDWR, ISO1430BDW): 5000 VRMS, meeting IEC 62368-1 and IEC 61010-1 reinforced isolation requirements for medical-adjacent industrial or safety-rated machinery.
For systems that will pass CE marking with reinforced isolation, you need a BDW variant. For standard industrial designs behind a system-level isolation barrier, the DW/DWR packages are more cost-effective and have slightly smaller footprint in the SOIC-16W body.
3. Bus Fault Protection
Both families share TI's ±70 V bus fault protection on the RS-485/RS-422 bus side. This specification exceeds the ±60 V minimum required for IEC 61000-4 tests and handles load-dump events common in industrial plant-floor installations. Engineers moving from older isolated transceivers with only ±35 V protection will appreciate this hardened front-end, particularly in motor-drive cabinets where cable routing can expose the differential pair to transient common-mode swings.
4. Half-Duplex vs. Full-Duplex Architecture
The ISO1410 uses a half-duplex topology with a single differential pair; the driver-enable (DE) and receiver-enable (/RE) pins control bus direction. This is the standard RS-485 multi-drop topology used in Modbus RTU and BACnet MS/TP.
The ISO1430 uses a full-duplex topology with separate transmit and receive differential pairs, matching the RS-422 point-to-point wiring model. If your physical layer is already wired full-duplex (four wires between nodes), the ISO1430 removes the need for software-controlled direction switching, simplifying firmware and eliminating turnaround-time constraints.
5. Supply Chain and Availability
Both devices are active production parts from Texas Instruments and are stocked by major distributors. The ISO1410 family, being an older and simpler part, generally carries deeper available-to-ship inventory. The ISO1430, as a higher-performance device, may see tighter allocation during component shortages. For designs with a multi-year production horizon, qualifying both a primary and alternate distributor is prudent.
FindMyChip connects buyers with 200+ verified distributors and provides real-time pricing and availability—particularly valuable when spot market supply tightens. You can compare live quotes for ISO1410BDW, ISO1410BDWR, ISO1410DWR, ISO1430BDW, ISO1430DW, and ISO1430DWR across the platform.
6. Cost Analysis
At volume pricing, the ISO1410 variants cost roughly $2.50–$4.00, while the ISO1430 variants run $3.00–$5.50. The premium for the ISO1430 reflects its higher-speed analog front end. For a 500-node installation, the $1–$2 per-unit difference adds up; if your system only needs 500 kbps, the ISO1410 saves meaningful BOM cost at scale.
Use Case Recommendations
Choose ISO1410 (ISO1410BDW / ISO1410BDWR / ISO1410DWR) when:
- Your protocol is Modbus RTU, BACnet MS/TP, or DNP3 at ≤ 115.2 kbps.
- You need half-duplex multi-drop RS-485 with up to 32 unit loads on the bus.
- BOM cost optimization is a priority in high-volume production.
- Reinforced isolation (BDW variants) is required for safety-rated or CE-marked equipment.
- EMI on long RS-485 cable runs is a concern (slower edges help).
Choose ISO1430 (ISO1430BDW / ISO1430DW / ISO1430DWR) when:
- Your protocol runs full-duplex RS-422 at speeds between 1 Mbps and 20 Mbps.
- You are interfacing optical encoders, resolvers, or high-speed serial links to an FPGA or DSP.
- Firmware complexity from direction control needs to be eliminated.
- Future data-rate headroom is required for protocol upgrades.
FAQ
Q1: Can I substitute an ISO1430 for an ISO1410 in an existing Modbus design?
Yes, with caveats. The ISO1430's pinout is compatible for basic function, but its full-duplex architecture means you will leave the second differential pair unconnected in a half-duplex wiring scheme. This wastes one differential pair but is electrically safe. Verify the slew-rate behavior at your actual baud rate, as the faster rise times may require bus termination adjustments.
Q2: What is the difference between the BDW and DWR package suffixes?
The BDW suffix indicates the SOIC-16W wide-body package with reinforced isolation (5000 VRMS). The DWR suffix indicates a tape-and-reel SOIC-16W with standard 2500 VRMS isolation. Both are electrically equivalent to their non-reel counterparts; "R" simply denotes tape-and-reel packaging for SMT assembly line feeding. Use BDW/BDWR when your safety certification requires reinforced isolation.
Q3: Do both families support 3.3 V and 5 V mixed-voltage systems?
Yes. Both sides of the isolator (VCC1 for the logic side, VCC2 for the bus side) accept 3.0 V to 5.5 V independently. This makes them ideal for systems where the MCU runs at 3.3 V but the RS-485 bus power rail is 5 V—no level shifters required.
Where to Source ISO1410 and ISO1430
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Looking for technical guidance on selecting isolated RS-485 transceivers for your specific application? Browse our blog for in-depth application notes and component selection guides.