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Texas Instruments ISO7631FCDWR
- Part No.:
- ISO7631FCDWR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7631FCDWR.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,567
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Product details
Overview
ISO7631FCDWR from Texas Instruments is a triple-channel digital isolator with two forward and one reverse signal paths, 4242 VPK reinforced isolation per DIN V VDE V 0884-10, 25 Mbps signaling rate (C-grade), 1.5 mA typical supply current per channel at 10 Mbps (3.3-V supplies), and fail-safe low-state output default-designed for industrial fieldbus and servo control interfaces requiring robust noise immunity and level translation.
For engineers reviewing the ISO7631FCDWR datasheet, ISO7631FCDWR pinout, ISO7631FCDWR application, or ISO7631FCDWR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for optocoupler replacement in safety-critical industrial systems.
Technical Context
The ISO7631FCDWR implements capacitive SiO2 isolation with dual-supply architecture: VCCI/GNDI powers input-side logic (channels A/B/C), while VCCO/GNDO powers output-side logic (channels A/B/C). Its integrated noise filter suppresses input pulses <6 ns-critical for noisy motor drive environments.
It supports bidirectional level translation across 2.7–5.5 V on both sides, TTL-compatible input thresholds (~1.5 V), and independent enable inputs (EN1, EN2) to disable output channels A/B and C respectively-enabling selective power gating without affecting isolation integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 4242 VPK basic insulation per DIN V VDE V 0884-10 - meets reinforced insulation requirements for industrial safety standards including EN/UL/CSA 61010-1. |
| Signaling Rate | 25 Mbps maximum - sufficient for Profibus DP, Modbus RTU, and DeviceNet™ data rates without overspecifying cost or power. |
| Supply Current | 1.5 mA per channel at 10 Mbps (3.3-V supplies) - enables low-power operation in battery-backed or thermally constrained PLC modules. |
| Propagation Delay | Typical 12 ns (C-grade) - ensures timing predictability in closed-loop servo feedback paths with sub-microsecond latency budgets. |
| Common-Mode Transient Immunity | 50 kV/µs typical - rejects fast transients from IGBT switching in motor drives without data corruption. |
| Fail-Safe Output State | Low-state default on power loss or fault - prevents unintended actuation in safety-critical outputs like emergency stop circuits. |
| Operating Temperature | –40°C to 125°C - supports deployment in uncooled industrial enclosures and under-hood automotive subsystems. |
Pinout & Package
ISO7631FCDWR uses a wide-body SOIC-16 (DW) package measuring 10.30 mm × 7.50 mm, optimized for creepage/clearance compliance in high-voltage industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC | Input signals for channels A, B, C | Accept TTL-level logic (VIH ≥ 2 V, VIL ≤ 0.8 V); 5-V tolerant when VCCI = 2.7 V or 3.3 V. |
| OUTA, OUTB, OUTC | Output signals for channels A, B, C | Drive CMOS loads; VOH ≥ VCCO – 0.6 V (3.3-V operation), VOL ≤ 0.5 V at 4 mA sink. |
| VCCI, GNDI | Input-side power and ground | Isolated supply domain for input buffers; supports 2.7–5.5 V operation independent of output side. |
| VCCO, GNDO | Output-side power and ground | Isolated supply domain for output drivers; enables level translation between disparate logic domains. |
| EN1, EN2 | Channel enable controls | EN1 disables OUTC; EN2 disables OUTA/OUTB - allows dynamic channel shutdown to reduce system power during idle states. |
| NC (pins 6, 11) | No-connect terminals | Floating pins with no internal connection; must remain unconnected per TI design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated noise filter | Rejects input transients <6 ns duration - eliminates false triggering in EMI-heavy factory automation environments. |
| Fail-safe low-state output | Outputs default to logic low during power loss, overtemperature, or isolation barrier fault - critical for SIL-2 functional safety compliance. |
| Dual-supply level translation | Supports 2.7–5.5 V on both VCCI and VCCO - enables direct interface between 3.3-V microcontrollers and 5-V PLC backplanes. |
| SiO2 isolation barrier | Guaranteed >40-year lifetime per JEDEC JESD22-A108 - outperforms optocouplers in long-life industrial equipment. |
| Reinforced insulation certification | TUV-certified 3000 VRMS reinforced insulation per EN/UL/CSA 60950-1 - satisfies regulatory requirements for mains-connected equipment. |
Applications
| Industrial Fieldbus Interface | Servo Motor Control |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in Profibus DP or Modbus RTU nodes mounted on factory floor cabinets exposed to 480-VAC motor noise. IC Role / Device Role / Timing Role: Signal-level galvanic isolation between controller UART and bus PHY, breaking ground loops while preserving 25-Mbps timing integrity. Use Value: Prevents data corruption from common-mode transients up to 50 kV/µs, enabling reliable communication in electrically noisy environments without external filtering. |
Use Scenario: Isolating position encoder feedback (A/B/Z quadrature) and PWM gate-drive signals in closed-loop servo drives. IC Role / Device Role / Timing Role: Bidirectional isolation of encoder signals (forward path) and fault reporting (reverse path) with sub-12-ns propagation delay. Use Value: Maintains phase coherence between command and feedback paths, supporting 20-kHz servo loop bandwidths without jitter-induced instability. |
| Programmable Logic Controller I/O Module | Industrial Power Supply Monitoring |
|
Use Scenario: Providing isolated digital inputs for 24-VDC sensor monitoring and isolated outputs for solenoid/relay control in modular PLC chassis. IC Role / Device Role / Timing Role: Three-channel isolation with independent enables (EN1/EN2) to selectively power down unused I/O groups during standby. Use Value: Reduces module quiescent current by >40% versus always-on isolation, extending thermal margin in densely packed control cabinets. |
Use Scenario: Isolating voltage/current sense signals and fault alerts between primary-side SMPS controllers and secondary-side MCU supervisors. IC Role / Device Role / Timing Role: Forward-path isolation of analog-to-digital converter outputs and reverse-path isolation of overvoltage/overcurrent interrupts. Use Value: Enables safe, standards-compliant monitoring of hazardous primary-side voltages while maintaining fast (<1 µs) fault response times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7731FDWR | Higher CMTI (100 kV/µs), 50 Mbps data rate, same 3-channel 2F/1R topology and DW-16 package. | Better suited for ultra-noisy inverters or SiC-based power converters where transient immunity exceeds 50 kV/µs. | Select ISO7731FDWR when upgrading legacy ISO7631FCDWR designs for next-gen power electronics with faster switching edges. |
| ADUM1301BRWZ | 3-channel, 100 Mbps, 2.5 kVRMS isolation, SOIC-16 package but only basic insulation (not reinforced). | Lacks reinforced insulation certification - unsuitable for mains-connected equipment requiring EN 61010-1 compliance. | Consider ADUM1301BRWZ only in low-voltage, non-safety-critical applications where cost is prioritized over regulatory certification. |
Compared with ISO7731FDWR and ADUM1301BRWZ, ISO7631FCDWR provides optimal balance of certified reinforced isolation, 25-Mbps capability, and ultra-low 1.5-mA/channel power-making it the preferred choice for cost-sensitive, safety-compliant industrial fieldbus nodes where extreme speed or ultra-high CMTI are unnecessary.
Availability
ISO7631FCDWR is available at Aetrix Electronics and suitable for industrial fieldbus nodes, servo motor control interfaces, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ISO7631FCDWR 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 components for industrial, automotive, and communications markets.
The ISO76x1 family was engineered specifically for replacing optocouplers in industrial automation systems-delivering higher reliability, lower power, and certified reinforced isolation without sacrificing ease of use or PCB footprint.
FAQ
What is the isolation rating of ISO7631FCDWR and which standards does it meet?
The ISO7631FCDWR provides 4242 VPK basic insulation per DIN V VDE V 0884-10 and is TUV-certified for 3000 VRMS reinforced insulation per EN/UL/CSA 60950-1 and EN/UL/CSA 61010-1. It also meets UL 1577 (2500 VRMS for 1 minute) and CQC GB4943.1-2011-making ISO7631FCDWR compliant for use in mains-connected industrial equipment requiring reinforced isolation.
Does ISO7631FCDWR support level translation between different supply voltages?
Yes, ISO7631FCDWR supports true bidirectional level translation: VCCI can operate from 2.7 V, 3.3 V, or 5 V independently of VCCO, which may be set to a different voltage within the same range. This allows ISO7631FCDWR to interface a 3.3-V microcontroller with a 5-V fieldbus transceiver or vice versa-without external level shifters-while maintaining full isolation integrity.
What is the function of EN1 and EN2 pins on ISO7631FCDWR?
EN1 controls the output state of channel C (OUTC): when pulled low, OUTC is disabled and driven to logic low; when high or open, OUTC operates normally. EN2 controls channels A and B (OUTA/OUTB) collectively. These enables allow dynamic power gating of isolated channels-reducing total system current in low-activity states without disrupting isolation barrier functionality in ISO7631FCDWR.
How does the fail-safe output behavior work in ISO7631FCDWR?
ISO7631FCDWR features a fail-safe low-state output: whenever VCCI or VCCO drops below operational threshold, or during internal fault conditions, all outputs (OUTA, OUTB, OUTC) default to logic low. This behavior is hardwired-not software-configurable-and ensures predictable, safe deactivation of downstream actuators or bus drivers in ISO7631FCDWR-based systems.
Can ISO7631FCDWR replace optocouplers in existing designs without layout changes?
Yes, ISO7631FCDWR uses the industry-standard wide-body SOIC-16 (DW) package with identical 10.30 mm × 7.50 mm footprint and creepage/clearance dimensions as legacy optocouplers like HCPL-0723. Its pinout is not pin-compatible with those devices, but the package compatibility allows drop-in board replacement with minimal routing changes-especially when leveraging its dual-supply flexibility to eliminate external bias networks required by optocouplers.
ISO7631FCDWR 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:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 28ns, 28ns
- Pulse Width Distortion (Max):
- 3ns
- Rise / Fall Time (Typ):
- 2.8ns, 2.9ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISO7631FCDWR FAQ
1.How can I place an order for ISO7631FCDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7631FCDWR 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 ISO7631FCDWR reliable?
The price and inventory of ISO7631FCDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7631FCDWR is usually 5 days.
3.What payment methods are accepted for ISO7631FCDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7631FCDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7631FCDWR?
ISO7631FCDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7631FCDWR 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 ISO7631FCDWR?
For technical support, including ISO7631FCDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7631FCDWR requirements.
6.How does Aetrix verify that ISO7631FCDWR is sourced from the original manufacturer or authorized distributors?
All ISO7631FCDWR 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 ISO7631FCDWR meets industry standards.
7.What is the process for return or replacement of ISO7631FCDWR?
All ISO7631FCDWR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7631FCDWR, 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 ISO7631FCDWR part is unused and in its original packaging.
Return procedure for ISO7631FCDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7631FCDWR Tags
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