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Texas Instruments ISO7731DWR
- Part No.:
- ISO7731DWR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7731DWR.pdf
- Description:
- DGTL ISO 5000VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
ISO7731DWR from Texas Instruments is a reinforced triple-channel digital isolator with two forward and one reverse signal direction, 100Mbps data rate, 5000VRMS isolation (DW package), and ±100kV/μs CMTI. It operates from 2.25V–5.5V supplies across –55°C to +125°C and supports level translation between input/output domains in industrial motor control and solar inverter interfaces.
For engineers reviewing the ISO7731DWR datasheet, ISO7731DWR pinout, ISO7731DWR application, or ISO7731DWR equivalent, this page delivers verified functional architecture, validated safety certifications (VDE 0884-17, UL 1577, IEC 62368-1), exact pin-level enable logic, and real-world EMC performance metrics including system-level surge immunity and contact ESD protection.
Technical Context
The ISO7731DWR implements dual capacitive SiO₂ isolation barriers per channel, enabling reinforced insulation compliance per DIN EN IEC 60747-17. Its asymmetric channel configuration (2 forward, 1 reverse) supports bidirectional bus control in isolated RS-485 or CAN transceiver interfaces while maintaining independent VCCI/VCCO domains.
Enable pins EN1 and EN2 provide side-specific output tri-state control for multi-controller arbitration, and internal UVLO circuitry (2.25V rising threshold) ensures deterministic power-on reset behavior. Propagation delay is 11ns typical at 5V, with <1ns channel-to-channel skew under matched load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 100 Mbps maximum - supports high-speed serial links like isolated SPI, RS-485, and CAN FD physical layer interfaces |
| Isolation rating | 5000 VRMS (UL 1577), reinforced - enables use in mains-connected equipment requiring double insulation per IEC 62368-1 |
| CMTI | ±100 kV/μs typical - rejects fast common-mode transients in motor drives and inverters without signal corruption |
| Supply range | 2.25 V to 5.5 V per side - allows direct interfacing with 3.3V microcontrollers and 5V analog front-ends |
| Operating temperature | –55°C to +125°C - qualified for under-hood automotive and industrial ambient environments |
| Propagation delay | 11 ns typical at 5V - enables timing-critical applications such as gate driver feedback loops and real-time encoder interfaces |
| Surge capability | 12.8 kV peak (oil test) - meets IEC 62368-1 surge immunity requirements for Class II power supplies and grid-tied inverters |
Pinout & Package
ISO7731DWR is housed in a 16-pin wide-SOIC (DW) package measuring 10.30 mm × 7.50 mm, with creepage/clearance >8 mm and reinforced insulation barrier certified to VDE 0884-17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1, VCC2 | Input-side and output-side supply rails | Independent 2.25–5.5V domains enable level-shifting; UVLO active on both sides |
| GND1, GND2 | Input-side and output-side ground references | Galvanically isolated grounds prevent ground-loop noise coupling in mixed-signal systems |
| INA, INB, INC | Digital input terminals (side 1) | CMOS/LVCMOS-compatible inputs; 0.3×VCCI to 0.7×VCCI thresholds ensure noise margin |
| OUTA, OUTB, OUTC | Digital output terminals (side 2) | Configured as two forward (A,B), one reverse (C); default-high outputs without F suffix |
| EN1, EN2 | Output enable controls for side 1 and side 2 | Active-high enables; pulling low places respective outputs in high-impedance for bus sharing |
| NC | No-connect pins | Pins 6, 7, 11 are unconnected - must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced isolation barrier | 5000 VRMS UL rating and >30-year lifetime at 1500 VRMS working voltage - eliminates need for external isolation components in safety-critical designs |
| High CMTI | ±100 kV/μs typical - maintains signal integrity during IGBT switching transients in motor drives |
| Side-selectable enable | Separate EN1/EN2 pins allow independent tri-state control of input and output sides - essential for daisy-chained isolated communication buses |
| Wide temperature operation | –55°C to +125°C ambient range - supports deployment in engine control units and outdoor solar inverters |
| Low-power 100Mbps operation | 17.5 mA ICC2 at 100 Mbps (5V) - reduces thermal load in densely packed power electronics enclosures |
Applications
| Industrial Motor Drives | Solar Inverters |
|---|---|
Use Scenario: Isolating gate driver signals and current-sense feedback in three-phase IGBT/SiC inverter stages. IC Role / Device Role / Timing Role: ISO7731DWR provides reinforced isolation for PWM control signals and fault reporting paths with sub-12ns propagation delay. Use Value: Enables safe operation at 1500 VRMS working voltage while rejecting >100 kV/μs transients generated by fast-switching power devices. | Use Scenario: Isolating DC-link voltage sensing and MPPT controller communication in string inverters. IC Role / Device Role / Timing Role: Acts as a triple-channel isolator for analog front-end ADC interface, isolated UART, and fault signaling across high-voltage DC bus. Use Value: Dual supply domains (VCCI/VCCO) support 3.3V MCU interfacing with 5V sensor circuits without external level shifters. |
| Medical Power Supplies | Programmable Logic Controllers |
Use Scenario: Providing patient-isolated monitoring and control in AC/DC power modules compliant with IEC 60601-1. IC Role / Device Role / Timing Role: Delivers 2 MOPP isolation for feedback loop signals and status reporting in isolated DC-DC converters. Use Value: Certified to VDE 0884-17 and IEC 60601-1 - eliminates need for additional isolation validation in Class II medical equipment. | Use Scenario: Isolating field I/O signals (digital inputs, relay drivers) and backplane communication in modular PLC chassis. IC Role / Device Role / Timing Role: Provides channelized isolation for discrete input conditioning, output drive enable, and isolated CAN bus interface. Use Value: 16-pin SOIC footprint simplifies PCB layout; NC pins allow routing flexibility without compromising creepage distance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM3301ARWZ | 3.3V-only supply, 25Mbps max, 2500VRMS isolation, no enable pins | Limited to low-speed industrial I/O; lacks side-selectable tri-state and high-speed capability | Select when cost sensitivity outweighs speed/safety requirements and 3.3V-only operation is acceptable |
| SI8631BB-B-IS | 3000VRMS basic isolation, 100Mbps, 2.5–5.5V supply, no EN pins | Not certified for reinforced insulation; unsuitable for medical or mains-connected safety-critical systems | Choose only for non-safety-critical automation where VDE/UL reinforced certification is not required |
Compared with ADUM3301ARWZ and SI8631BB-B-IS, the ISO7731DWR uniquely combines 100Mbps speed, 5000VRMS reinforced isolation, side-selectable enable functionality, and full VDE/UL/IEC safety certification - making it the only option qualified for high-reliability, safety-compliant high-speed isolation in motor drives and solar inverters.
Availability
ISO7731DWR is available at Aetrix Electronics and suitable for industrial motor control, solar inverter design, and medical power supply development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ISO7731DWR 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 focused on analog, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The ISO773x family was designed specifically for robust, high-speed galvanic isolation in noise-prone power electronics systems - emphasizing EMC resilience, safety certification, and precise timing control.
FAQ
What is the isolation rating and safety certification status of the ISO7731DWR?
The ISO7731DWR carries a 5000 VRMS isolation rating per UL 1577 and is certified to DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. It also holds IEC 62368-1, IEC 60601-1 (2 MOPP), and GB 4943.1 certifications. These qualifications confirm its suitability for safety-critical applications such as medical power supplies and grid-connected solar inverters where double insulation is mandated. The ISO7731DWR meets all required test criteria for surge, ESD, and transient immunity within its rated working voltage of 1500 VRMS.
How does the channel direction configuration of ISO7731DWR differ from ISO7730DWR?
The ISO7731DWR features two forward-direction channels (INA→OUTA, INB→OUTB) and one reverse-direction channel (INC←OUTC), enabling bidirectional signal flow across the isolation barrier. In contrast, the ISO7730DWR has all three channels unidirectional (forward only). This makes the ISO7731DWR ideal for applications like isolated CAN or RS-485 transceivers where command and response paths must coexist. The ISO7731DWR's reverse channel supports true full-duplex isolation without requiring external logic inversion or additional isolators.
Does ISO7731DWR support independent input and output supply voltages?
Yes, the ISO7731DWR supports fully independent VCCI (input-side) and VCCO (output-side) supplies ranging from 2.25 V to 5.5 V each. This allows seamless level translation - for example, interfacing a 3.3V microcontroller (VCCI) with a 5V analog front-end or gate driver (VCCO). The device maintains specified timing, noise immunity, and output drive strength across all valid supply combinations, with no requirement for supply sequencing or matching.
What is the function of EN1 and EN2 pins on ISO7731DWR?
EN1 and EN2 are active-high output enable pins controlling side-1 (input side) and side-2 (output side) outputs respectively. When EN1 is low, all side-1 outputs (OUTA, OUTB, OUTC) enter high-impedance state; when EN2 is low, side-2 outputs do likewise. This enables multi-controller bus arbitration and dynamic power reduction. Both pins default to enabled when left open, and their logic levels are referenced to their respective supply domains (EN1 to VCCI, EN2 to VCCO), ensuring reliable operation under asymmetric supply conditions.
Can ISO7731DWR be used in automotive applications?
The standard ISO7731DWR is not qualified to AEC-Q100; however, the pin-compatible automotive-grade variant ISO7731QDWR is available and qualified for operation from –40°C to +125°C with enhanced reliability testing. For non-automotive transportation applications (e.g., e-bikes, scooters, industrial vehicles), the ISO7731DWR may be deployed where extended temperature range (–55°C to +125°C) and robust EMC performance meet system requirements - but formal automotive qualification requires the Q1 version.
ISO7731DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 85kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 16ns, 16ns
- Pulse Width Distortion (Max):
- 4.9ns
- Rise / Fall Time (Typ):
- 1.3ns, 1.4ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISO7731DWR FAQ
1.How can I place an order for ISO7731DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7731DWR 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 ISO7731DWR reliable?
The price and inventory of ISO7731DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7731DWR is usually 5 days.
3.What payment methods are accepted for ISO7731DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7731DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7731DWR?
ISO7731DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7731DWR 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 ISO7731DWR?
For technical support, including ISO7731DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7731DWR requirements.
6.How does Aetrix verify that ISO7731DWR is sourced from the original manufacturer or authorized distributors?
All ISO7731DWR 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 ISO7731DWR meets industry standards.
7.What is the process for return or replacement of ISO7731DWR?
All ISO7731DWR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7731DWR, 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 ISO7731DWR part is unused and in its original packaging.
Return procedure for ISO7731DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7731DWR 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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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
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ISO7741FDWR
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