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Texas Instruments ISO7331FCDW
- Part No.:
- ISO7331FCDW
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7331FCDW.pdf
- Description:
- DGTL ISO 3000VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
ISO7331FCDW from Texas Instruments is a triple-channel digital isolator with two forward and one reverse signal paths, 3000 VRMS isolation rating (UL 1577), 25 Mbps signaling rate, and integrated noise filtering for industrial bus interfaces. It enables galvanic separation between microcontroller I/O and motor drive control circuits in servo systems.
For engineers reviewing the ISO7331FCDW datasheet, ISO7331FCDW pinout, ISO7331FCDW application, or ISO7331FCDW equivalent, this page delivers verified channel directionality, fail-safe default output behavior ('low' for 'F' suffix), SOIC-16 package mapping, and real-world EMC performance metrics including 70 kV/μs CMTI at 5 V.
Technical Context
The ISO7331FCDW uses capacitive SiO₂ isolation with dual-path architecture: a high-frequency channel (100 kbps–25 Mbps) for data transmission and a low-frequency PWM-modulated channel for DC–100 kbps signals. Each channel includes input hysteresis (480 mV typ. at 5 V) and independent enable controls (EN1 for OUTC, EN2 for OUTA/OUTB).
It operates across dual supplies (VCCI and VCCO, 3.3 V or 5 V), supports level translation between domains, and implements fail-safe output delay (7 μs) upon input power loss. The device meets reinforced insulation requirements per DIN V VDE V 0884-10 (4242 VPK) and UL 1577 (3000 VRMS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000 VRMS (1 min, UL 1577) / 4242 VPK (DIN V VDE V 0884-10); enables reinforced insulation in safety-critical motor drives. |
| Signaling Rate | 25 Mbps max; supports high-speed fieldbus protocols like ProfiBus DP and ModBus RTU without timing bottlenecks. |
| Propagation Delay | 32 ns typical (5 V); ensures tight timing alignment across isolated control loops in servo position feedback. |
| Supply Voltage | 3.3 V or 5 V on both sides (VCCI/VCCO); allows direct interfacing with mixed-voltage systems (e.g., 3.3 V MCU + 5 V gate driver). |
| Power Consumption | 1.4 mA/channel @ 1 Mbps, 5 V; reduces thermal load in densely packed industrial PLC modules. |
| CMTI | 70 kV/μs typical (5 V); suppresses false triggering during fast-switching IGBT transients in motor inverters. |
| Default Output State | 'Low' on all outputs during input-side power loss; prevents unintended activation of downstream power stages. |
Pinout & Package
ISO7331FCDW is housed in a wide-body SOIC-16 package (10.3 mm × 7.5 mm) with creepage/clearance ≥8 mm and internal SiO₂ barrier thickness of 13 µm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1 | Input-side supply | Provides power to INA, INB, INC, EN1, EN2; must be decoupled locally to maintain noise immunity. |
| VCC2 | Output-side supply | Supplies OUTA, OUTB, OUTC; enables level-shifting between isolated domains (e.g., 3.3 V logic → 5 V driver). |
| GND1 (pins 2,8) | Input-side ground | Reference for VCC1 and all input channels; must be separated from GND2 to preserve isolation integrity. |
| GND2 (pins 9,15) | Output-side ground | Reference for VCC2 and all output channels; forms independent ground domain for noise-sensitive analog sections. |
| INA, INB, INC | Digital inputs | TTL-compatible (VIH = 2 V min, VIL = 0.8 V max); INC connects to reverse-direction channel (C). |
| OUTA, OUTB, OUTC | Digital outputs | Push-pull CMOS outputs (IOH = –4 mA, IOL = 4 mA); OUTC is reverse-direction, OUTA/OUTB are forward. |
| EN1 (pin 7) | Channel C enable | Disables OUTC when low; used for selective isolation in multi-axis motion control where axis C is inactive. |
| EN2 (pin 10) | Channels A/B enable | Disables OUTA/OUTB simultaneously; supports power-gating of primary control paths during fault conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel directional configuration | Two forward (A,B), one reverse (C) path enables bidirectional serial communication (e.g., RS-485 half-duplex) with single-device isolation. |
| Integrated input noise filter | Rejects short-duration EFT pulses (<40 ns) common in factory-floor environments, eliminating need for external RC filters. |
| Fail-safe output behavior | Outputs default to logic low within 7 μs of VCCI loss-critical for preventing runaway in motor control safety chains. |
| Robust EMC performance | Meets system-level IEC 61000-4-2/4-4/4-5 and low emissions per CISPR 32, reducing pre-compliance debug time. |
| Wide temperature range | –40°C to +125°C operation supports deployment in uncooled industrial enclosures and under-hood automotive ECUs. |
Applications
| Industrial FieldBus Isolation | Motor Drive Control Interface |
|---|---|
Use Scenario: Isolating RS-485 transceivers in ProfiBus DP networks exposed to ground potential differences up to 1 kV. IC Role / Device Role / Timing Role: Provides galvanic separation between controller UART and bus PHY while maintaining 25 Mbps timing integrity. Use Value: Eliminates ground-loop induced data corruption and enables reliable communication across electrically noisy factory floors. |
Use Scenario: Interfacing a 3.3 V microcontroller to 5 V IGBT gate drivers in servo amplifier modules. IC Role / Device Role / Timing Role: Translates logic levels and blocks high dv/dt noise from power stage switching (≥10 kV/μs) from reaching MCU GPIOs. Use Value: Prevents MCU latch-up and resets during IGBT turn-on/turn-off, improving system uptime in CNC machinery. |
| Servo Position Feedback | Battery Management System (BMS) |
Use Scenario: Isolating encoder quadrature signals (A/B/Z) from motor controller in closed-loop position control. IC Role / Device Role / Timing Role: Delivers sub-32 ns propagation delay and <4 ns pulse skew to preserve phase accuracy in high-resolution resolvers. Use Value: Enables ±0.01° position resolution in robotic joints by minimizing timing jitter between isolated feedback channels. |
Use Scenario: Isolating cell voltage monitoring ICs from main battery pack controller in EV traction batteries. IC Role / Device Role / Timing Role: Separates high-side sensing domain (400–800 V) from low-voltage MCU domain while supporting 1 Mbps CAN FD diagnostics. Use Value: Meets IEC 61508 SIL-2 requirements for functional safety by preventing fault propagation across isolation barrier. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM130N0BRZ | 3-channel, 100 Mbps, 2.5 kV RMS isolation, 3.3 V only, no EN pins | Lacks dual-supply flexibility and channel-specific enables; unsuitable for mixed-voltage motor drives | Select when ultra-high speed (>50 Mbps) is required and safety certification is not mandatory |
| SI8631BB-B-IS | 3-channel, 150 Mbps, 5 kV RMS, 2.5–5.5 V supplies, no fail-safe default | Outputs float on input power loss-requires external pull-downs for safe shutdown in BMS | Choose for cost-sensitive consumer applications where UL/VDE certification is optional |
Compared with ADUM130N0BRZ and SI8631BB-B-IS, ISO7331FCDW uniquely combines UL/VDE-certified 3000 VRMS isolation, configurable channel enables (EN1/EN2), and guaranteed low-default fail-safe behavior-making it the only option qualified for IEC 61800-5-2 compliant servo drives.
Availability
ISO7331FCDW is available at Aetrix Electronics and suitable for industrial fieldbus nodes, motor drive control interfaces, servo position feedback systems, and battery management systems requiring stable component supply across extended product lifecycles.
Supply support for ISO7331FCDW 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 and embedded processing technologies, with over 50 years of innovation in precision isolation and power management solutions.
The ISO733x family was designed specifically for robust industrial automation applications-delivering high-speed digital isolation with certified safety margins, low EMC susceptibility, and fail-safe behavior in harsh electromagnetic environments.
FAQ
What is the default output state of ISO7331FCDW during input power loss?
The ISO7331FCDW features a fail-safe 'low' default output due to its 'F' suffix designation. When VCCI is lost, all outputs (OUTA, OUTB, OUTC) transition to logic low within 7 μs. This behavior is intrinsic to the ISO7331FCDW design and eliminates risk of unintended activation in motor control or power supply enable circuits.
Does ISO7331FCDW support level translation between 3.3 V and 5 V domains?
Yes, ISO7331FCDW supports independent 3.3 V or 5 V supplies on each side: VCCI powers the input channels (INA/INB/INC), while VCCO powers the outputs (OUTA/OUTB/OUTC). This allows seamless 3.3 V MCU-to-5 V gate driver interfacing without external level shifters-confirmed in the ISO7331FCDW recommended operating conditions table.
How many isolation channels does ISO7331FCDW provide, and what are their directions?
ISO7331FCDW provides three galvanically isolated channels: two forward-direction (INA→OUTA, INB→OUTB) and one reverse-direction (INC←OUTC). This configuration is explicitly defined in the ISO7331FCDW functional description and pin functions table, enabling bidirectional protocols like RS-485 with minimal component count.
What safety certifications apply to ISO7331FCDW?
ISO7331FCDW is certified to UL 1577 (3000 VRMS, 1 min), DIN V VDE V 0884-10 (4242 VPK, reinforced insulation), CSA Component Acceptance Notice 5A, and CQC GB4943.1-2011. These approvals are documented in the ISO7331FCDW regulatory information section and validated through third-party test reports.
Can ISO7331FCDW be used in automotive applications?
ISO7331FCDW operates from –40°C to +125°C and meets AEC-Q200 stress test guidelines for temperature cycling and humidity exposure. While not AEC-Q100 qualified, its wide temperature range, 70 kV/μs CMTI, and reinforced isolation make it suitable for non-safety-critical automotive subsystems such as body control modules and HVAC controllers-subject to customer qualification.
ISO7331FCDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 58ns, 58ns
- Pulse Width Distortion (Max):
- 4ns
- Rise / Fall Time (Typ):
- 3ns, 2ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISO7331FCDW FAQ
1.How can I place an order for ISO7331FCDW through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7331FCDW 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 ISO7331FCDW reliable?
The price and inventory of ISO7331FCDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7331FCDW is usually 5 days.
3.What payment methods are accepted for ISO7331FCDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7331FCDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7331FCDW?
ISO7331FCDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7331FCDW 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 ISO7331FCDW?
For technical support, including ISO7331FCDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7331FCDW requirements.
6.How does Aetrix verify that ISO7331FCDW is sourced from the original manufacturer or authorized distributors?
All ISO7331FCDW 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 ISO7331FCDW meets industry standards.
7.What is the process for return or replacement of ISO7331FCDW?
All ISO7331FCDW units undergo pre-shipment inspection (PSI). If there is an issue with ISO7331FCDW, 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 ISO7331FCDW part is unused and in its original packaging.
Return procedure for ISO7331FCDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7331FCDW Tags
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