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Texas Instruments ISOW1432BDFMR
- Part No.:
- ISOW1432BDFMR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW1432BDFMR.pdf
- Description:
- DGT ISO 5KV 4CH RS422/485 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
ISOW1432BDFMR from Texas Instruments is a reinforced-isolation RS-485/RS-422 transceiver with integrated 5kVRMS galvanic isolation and an isolated DC-DC converter delivering up to 20mA at ±5% accuracy. It supports 12Mbps data rate, PROFIBUS-compatible bus operation, and operates across –40°C to 125°C ambient temperature. It enables compact isolated communication in industrial motor drives and solar inverters without external isolated power supplies.
For engineers reviewing the ISOW1432BDFMR datasheet, ISOW1432BDFMR pinout, ISOW1432BDFMR application, or ISOW1432BDFMR equivalent, this page delivers verified specifications, validated 20-pin SOIC package mapping, confirmed 100kV/µs CMTI, CISPR 32 Class B compliance on two-layer PCB, and real-world GPIO channel integration for diagnostics-critical for factory automation and protection relay designs requiring certified reinforced isolation.
Technical Context
The ISOW1432BDFMR integrates signal isolation (RS-485/RS-422 transceiver) and power isolation (25MHz low-noise DC-DC converter) within a single 20-pin DFM SOIC package. Its dual-isolation barrier provides 5kVRMS withstand voltage per UL 1577 and meets VDE 0884-17 reinforced insulation requirements.
It features independent logic supply (VIO: 1.71–5.5V) and converter supply (VDD: 3–5.5V), enabling flexible system-level voltage domain separation. The MODE pin selects between 3.3V RS-485 mode (MODE = GND2) and 5V PROFIBUS mode (MODE = VISOOUT), with failsafe receiver behavior and 1/8-unit-load support for up to 256 nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 12Mbps maximum - enables high-speed industrial fieldbus communication without timing bottlenecks. |
| Isolation Rating | 5kVRMS per UL 1577; reinforced insulation per VDE 0884-17 - certifies safe operation in safety-critical industrial environments. |
| CMTI | 100kV/µs typical - ensures robust noise immunity against fast common-mode transients in motor drive and inverter applications. |
| DC-DC Output | 20mA at ±5% accuracy - powers auxiliary circuitry (e.g., sensors, LEDs) without secondary isolated supply. |
| ESD Protection | ±16kV HBM on bus pins (A/B/Y/Z), ±8kV IEC 61000-4-2 contact discharge - eliminates need for external TVS diodes on RS-485 lines. |
| Operating Temperature | –40°C to +125°C - supports deployment in harsh environments including solar inverters and industrial transport systems. |
| Package | 20-pin DFM (SOIC-20 footprint), 12.83mm × 10.30mm body - compatible with standard SOIC assembly processes and provides ≥8mm creepage/clearance. |
Pinout & Package
ISOW1432BDFMR uses a 20-pin wide-body SOIC package (DFM) with 8mm minimum creepage and clearance, qualified for reinforced isolation. Pin functions are fully defined per TI SLLSF86D datasheet Rev. AUGUST 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIO (Pin 1) | Logic-side supply input | Accepts 1.71–5.5V to power digital interface; decoupled from isolated side for mixed-voltage MCU interfacing. |
| D (Pin 2), DE (Pin 3) | Transmit data and driver enable inputs | Standard RS-485 half-duplex control; DE has internal pull-down for default disable - prevents bus contention at power-up. |
| R (Pin 4), RE (Pin 5) | Receive data output and receiver enable input | R outputs decoded bus data; RE has internal pull-up - receiver enabled by default unless actively disabled. |
| GNDIO (Pin 6), GND1 (Pin 10) | Logic-side ground references | Must be shorted directly on PCB - establishes unified reference for VIO and side-1 logic circuits. |
| EN/FLT (Pin 8) | Multi-function enable/fault pin | Configurable as DC-DC enable (pull-up internal) or open-drain fault alert - simplifies system-level power sequencing and diagnostics. |
| VDD (Pin 9) | Converter primary supply | 3–5.5V input for isolated DC-DC; UVLO thresholds (2.40–2.93V) ensure clean start-up under brownout conditions. |
| VISOOUT (Pin 12) | Isolated DC-DC output | Provides regulated 3.3V (MODE=GND2) or 5V (MODE=VISOOUT); ±5% accuracy enables direct powering of isolated peripherals. |
| MODE (Pin 13) | RS-485 voltage mode select | Configures transceiver for 3.3V operation (MODE=GND2) or 5V PROFIBUS mode (MODE=VISOOUT) - no external resistors required. |
| VISOIN (Pin 16) | Isolated bus supply input | Connects to VISOOUT via ferrite bead or direct short - supplies RS-485 driver/receiver side with galvanically isolated power. |
| A/B (Pins 20/19), Y/Z (Pins 17/18) | RS-485 differential bus terminals | Full-duplex capable; A/Y non-inverting, B/Z inverting - supports both RS-485 and RS-422 topologies with open/short/idle failsafe. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolated DC-DC converter | Meets CISPR 32 Class B radiated emissions on two-layer PCB with only two ferrite beads - eliminates EMI filter complexity and saves board space. |
| 2Mbps GPIO channel | IN/OUT pins provide bidirectional isolated signaling - replaces discrete digital isolators for LED status, supply monitoring, or fault reporting. |
| PROFIBUS-compatible RS-485 | Supports 5V operation with MODE pin; includes open/short/idle bus failsafe and 1/8-unit load - enables direct drop-in use in legacy industrial networks. |
| Reinforced isolation certification | VDE 0884-17, UL 1577, IEC 62368-1, IEC 61010-1, IEC 60601-1, GB 4943.1 - satisfies functional safety requirements for medical, test equipment, and industrial control. |
| High ESD robustness | ±16kV HBM on bus pins, ±8kV IEC 61000-4-2 contact discharge - protects against handling and field-induced electrostatic events without external clamping. |
Applications
| Factory Automation | Building Automation |
|---|---|
|
Use Scenario: PLC-to-I/O module communication over long cable runs in noisy manufacturing environments. IC Role / Device Role / Timing Role: Isolated RS-485 transceiver with integrated power - breaks ground loops while supplying isolated node power. Use Value: Eliminates external isolated DC-DC converters and reduces BOM count by 3+ components per node. |
Use Scenario: HVAC controller networking across multiple floors with varying ground potentials. IC Role / Device Role / Timing Role: Full-duplex isolated transceiver supporting 12Mbps burst data for real-time sensor updates. Use Value: Enables reliable communication despite >1kV common-mode transients induced by elevator motors and lighting ballasts. |
| Solar Inverters | Motor Drives |
|
Use Scenario: Isolated communication between DC-side controller and AC-side grid interface in string inverters. IC Role / Device Role / Timing Role: Reinforced-isolation transceiver with 125°C rating - operates reliably near heat-generating power stages. Use Value: Maintains 5kVRMS isolation integrity at elevated temperatures where conventional isolators derate or fail. |
Use Scenario: Encoder feedback and command signal transmission in servo drives with high dv/dt noise. IC Role / Device Role / Timing Role: High-CMTI (100kV/µs) isolated transceiver - rejects fast-switching noise from SiC/GaN power stages. Use Value: Prevents spurious data errors during PWM switching, eliminating costly retransmission or position loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated RS-485 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISOW1432DFMR | Basic isolation rating (VIOSM = 7800VPK vs. 10000VPK); same pinout, speed, and DC-DC specs. | Not certified for reinforced insulation per VDE 0884-17 - unsuitable for medical or safety-critical industrial systems requiring reinforced barrier. | Select ISOW1432DFMR only when basic isolation suffices and cost optimization is prioritized over safety certification scope. |
| ADM2483BRWZ | No integrated DC-DC; requires external isolated supply; 16Mbps max data rate; SOIC-16 package. | Lacks on-chip power conversion - increases design complexity and board area; higher data rate but no GPIO channel. | Choose ADM2483BRWZ when higher speed is mandatory and external isolated power is already available in the system architecture. |
Compared with ISOW1432DFMR, the ISOW1432BDFMR adds reinforced isolation certification and higher surge immunity (10kV vs. 7.8kV), making it suitable for safety-critical deployments; versus ADM2483BRWZ, it eliminates external isolated power design effort and adds diagnostic GPIO capability at the cost of lower maximum data rate.
Availability
ISOW1432BDFMR is available at Aetrix Electronics and suitable for factory automation, solar inverters, and motor drives requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation performance.
Supply support for ISOW1432BDFMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The ISOW14x2 product line delivers integrated signal-and-power isolation for space-constrained industrial communications, targeting RS-485/RS-422 applications where certification, EMI performance, and simplified bill-of-materials are critical.
FAQ
What isolation certifications does the ISOW1432BDFMR hold?
The ISOW1432BDFMR holds VDE 0884-17 reinforced insulation certification, UL 1577 component recognition (5kVRMS), IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1. These validate its use in safety-critical industrial, medical, and test equipment applications where reinforced barrier integrity is mandated. The ISOW1432BDFMR specifically achieves 10000VPK surge immunity per IEC 62368-1.
How does the ISOW1432BDFMR's integrated DC-DC converter meet CISPR 32 Class B emissions?
The ISOW1432BDFMR's 25MHz low-noise DC-DC converter meets CISPR 32 Class B radiated emissions on a two-layer PCB using only two ferrite beads - no additional filtering or multilayer board stack-up required. This is achieved through optimized transformer design, internal spread-spectrum modulation, and low-emission layout within the DFM package, reducing system-level EMI validation risk.
Can the ISOW1432BDFMR support both 3.3V and 5V RS-485 bus operation?
Yes - the ISOW1432BDFMR supports dual-voltage RS-485 operation via the MODE pin. Connecting MODE to GND2 configures the transceiver for 3.3V bus operation (VISOOUT = 3.3V); connecting MODE to VISOOUT enables 5V PROFIBUS-compliant operation (VISOOUT = 5V). Both modes retain failsafe receiver behavior and 1/8-unit-load capability.
What is the role of the EN/FLT pin on the ISOW1432BDFMR?
The EN/FLT pin on the ISOW1432BDFMR is a multi-function terminal that can be configured either as a DC-DC enable input (with internal pull-up) or as an open-drain fault output. When used as EN, driving it low disables the converter; when used as FLT, it asserts low upon converter fault (e.g., overtemperature or undervoltage), enabling real-time system diagnostics without additional monitoring circuitry.
Does the ISOW1432BDFMR require external components for basic operation?
No - the ISOW1432BDFMR requires only bypass capacitors (as specified in Section 9.3 of the datasheet) for full isolated RS-485 functionality. No external transformers, regulators, or TVS diodes are needed: the integrated DC-DC converter, 12Mbps transceiver, 2Mbps GPIO channel, and ±16kV HBM bus protection are all self-contained within the 20-pin DFM package.
ISOW1432BDFMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ISOW14x2
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- RS422, RS485
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs (Typ)
- Data Rate:
- 12Mbps
- Propagation Delay tpLH / tpHL (Max):
- 610ns, 610ns
- Pulse Width Distortion (Max):
- 40ns
- Rise / Fall Time (Typ):
- 4ns, 4ns (Max)
- Voltage - Supply:
- 1.71V ~ 1.89V, 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISOW1432BDFMR FAQ
1.How can I place an order for ISOW1432BDFMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW1432BDFMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISOW1432BDFMR reliable?
The price and inventory of ISOW1432BDFMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW1432BDFMR is usually 5 days.
3.What payment methods are accepted for ISOW1432BDFMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW1432BDFMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW1432BDFMR?
ISOW1432BDFMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW1432BDFMR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISOW1432BDFMR?
For technical support, including ISOW1432BDFMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW1432BDFMR requirements.
6.How does Aetrix verify that ISOW1432BDFMR is sourced from the original manufacturer or authorized distributors?
All ISOW1432BDFMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISOW1432BDFMR meets industry standards.
7.What is the process for return or replacement of ISOW1432BDFMR?
All ISOW1432BDFMR units undergo pre-shipment inspection (PSI). If there is an issue with ISOW1432BDFMR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISOW1432BDFMR part is unused and in its original packaging.
Return procedure for ISOW1432BDFMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW1432BDFMR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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