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Texas Instruments ISO7342FCDWR
- Part No.:
- ISO7342FCDWR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7342FCDWR.pdf
- Description:
- DGTL ISO 3000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,246
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Product details
Overview
ISO7342FCDWR from Texas Instruments is a quad-channel digital isolator with two forward and two reverse signal paths, galvanic isolation up to 3000 VRMS (1 min), 25 Mbps signaling rate, and integrated noise filtering for industrial bus interfaces. It operates across 3.3-V and 5-V supplies, supports –40°C to 125°C ambient, and features default-low outputs due to the 'F' suffix.
For engineers reviewing the ISO7342FCDWR datasheet, ISO7342FCDWR pinout, ISO7342FCDWR application, or ISO7342FCDWR equivalent, key selection criteria include channel directionality (2F/2R), enable control per side (EN1/EN2), low-power operation at 1.3 mA/channel (5 V @ 1 Mbps), and reinforced safety certifications including UL 1577 (3 kVRMS) and VDE V 0884-10 (4242 VPK).
Technical Context
The ISO7342FCDWR implements capacitive SiO₂-based isolation with separate input-side (VCCI/GNDI) and output-side (VCCO/GNDO) power domains, enabling level translation and ground-loop elimination. Its dual-enable architecture (EN1 for side-1 outputs, EN2 for side-2 outputs) allows independent channel-group control.
It integrates an input noise filter optimized for harsh industrial environments and uses TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). Propagation delay is 31 ns typical (5 V), with CMTI rated at 70 kV/μs - critical for motor drive and servo control immunity against fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000 VRMS (1 min, UL 1577); 4242 VPK (VDE V 0884-10) - enables safe separation between functional grounds in industrial equipment. |
| Signaling Rate | 25 Mbps - supports high-speed fieldbus protocols including Profibus DP and Modbus RTU at full data throughput. |
| Supply Voltage Range | 3 V to 5.5 V per side - allows interoperability between 3.3-V microcontrollers and 5-V PLC I/O stages without external level shifters. |
| Propagation Delay | 31 ns typical (5 V) - ensures tight timing alignment in closed-loop servo feedback paths. |
| Power Consumption | 1.3 mA/channel @ 1 Mbps, 5 V - reduces thermal load in densely packed motor drive gate driver boards. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive subsystems and industrial inverters with high ambient heat. |
| CMTI | 70 kV/μs typical - suppresses false triggering during IGBT switching transients in motor drives. |
| Default Output State | Low (due to 'F' suffix) - provides fail-safe behavior on input power loss in safety-critical enable circuits. |
Pinout & Package
ISO7342FCDWR is housed in a wide-body SOIC-16 (DW) package measuring 10.30 mm × 7.50 mm, with creepage and clearance >8 mm and internal insulation gap >13 µm - meeting reinforced insulation requirements for industrial safety standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC, IND | Input channels A–D | Side-1 digital inputs; INA/INB are forward-direction, INC/IND are reverse-direction (per ISO7342x configuration). |
| OUTA, OUTB, OUTC, OUTD | Output channels A–D | Side-2 digital outputs; OUTA/OUTB are forward-direction, OUTC/OUTD are reverse-direction. |
| VCCI, GNDI | Input-side supply | Powers input buffers and logic; decoupling required near Pin 1 (VCCI) and Pin 2/8 (GNDI). |
| VCCO, GNDO | Output-side supply | Powers output drivers; isolated from VCCI - enables ground potential separation between controller and power stage. |
| EN1 | Enable for side-1 outputs | Controls OUTA/OUTB; high = enabled, low = high-impedance - used for dynamic channel gating in multi-axis motion controllers. |
| EN2 | Enable for side-2 outputs | Controls OUTC/OUTD; independent of EN1 - allows asymmetric enable/disable of forward vs reverse data paths. |
| NC | No-connect | Pin 7 is unconnected; must remain floating - no PCB trace or solder mask removal required. |
Key Features
| Feature | Design Value |
|---|---|
| Two forward + two reverse channels | Enables bidirectional serial communication (e.g., UART or SPI half-duplex) across isolation barrier without external direction control logic. |
| Integrated input noise filter | Rejects short-duration EFT pulses (<40 ns) common in factory-floor environments - eliminates need for external RC filters on fieldbus lines. |
| Side-specific enable pins (EN1/EN2) | Allows independent power gating of forward and reverse data paths - reduces system-level standby current in battery-powered HMI modules. |
| 3.3-V/5-V dual-supply compatibility | Supports mixed-voltage systems: 3.3-V MCU core logic can safely interface with 5-V analog front-end or relay driver stages. |
| 70-kV/μs CMTI | Prevents metastability during rapid common-mode dv/dt events in motor inverter legs - critical for accurate PWM capture in real-time control loops. |
| Default-low output (F-suffix) | Guarantees safe deactivation of downstream power stages (e.g., gate drivers) during brownout or reset - meets IEC 61508 functional safety prerequisites. |
Applications
| Industrial Fieldbus Isolation | Motor Drive Feedback Interface |
|---|---|
Use Scenario: Isolating RS-485 transceivers in Profibus DP slave nodes deployed in noisy factory automation cells. IC Role / Device Role / Timing Role: Quad-channel isolator providing galvanic separation between controller UART and bus PHY, with two channels for TX/RX and two for control/status signals. Use Value: Eliminates ground loop currents that cause bit errors at 12 Mbps, while maintaining <31 ns propagation skew between data and enable lines. | Use Scenario: Transmitting encoder quadrature signals and receiving fault flags across isolation barrier in servo amplifier PCBs. IC Role / Device Role / Timing Role: Bidirectional signal conditioner: forward channels carry A/B/Z encoder pulses; reverse channels return overtemperature or undervoltage alerts. Use Value: 25 Mbps bandwidth preserves 1-MHz encoder edge fidelity; 70 kV/μs CMTI prevents false zero-crossing detection during IGBT switching. |
| Programmable Logic Controller I/O Module | Isolated DC-DC Converter Supervision |
Use Scenario: Digitally isolating 24-V digital input conditioning circuitry from 3.3-V FPGA logic in modular PLC backplanes. IC Role / Device Role / Timing Role: Signal translator and noise barrier: forward channels pass optocoupler output states; reverse channels deliver watchdog timeout signals to FPGA. Use Value: Dual enable (EN1/EN2) allows FPGA to disable input sampling during configuration, preventing spurious interrupts during hot-swap events. | Use Scenario: Monitoring isolated auxiliary supply rails (e.g., ±15 V) in medical-grade AC/DC converters with secondary-side microcontroller supervision. IC Role / Device Role / Timing Role: Level-shifting isolator: forward channels report overvoltage/undervoltage flags; reverse channels accept soft-start enable commands. Use Value: 3.3-V/5-V dual-supply operation lets secondary-side MCU (3.3 V) command primary-side gate driver (5 V) without level-shifter ICs - reducing BOM count by one component. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7342CDWR | Same pinout and specs, but default output is high (no 'F' suffix); 1.3 mA/channel power draw identical. | Suitable where fail-safe requires active-high enable (e.g., safety relays requiring energized-to-operate logic). | Select ISO7342CDWR only if system architecture mandates high-default outputs; verify EN1/EN2 timing compatibility with existing firmware. |
| ADUM1402ARWZ | 2 forward / 2 reverse channels; 1 Mbps max rate; 25 ns propagation delay; 2.5 kVRMS isolation; SOIC-16 package. | Better suited for low-speed, cost-sensitive industrial sensors where 25 Mbps headroom is unnecessary. | Choose ADUM1402ARWZ when design prioritizes lower unit cost over speed and CMTI; confirm 1 Mbps meets fieldbus baud rate requirements. |
Compared with ISO7342CDWR, ISO7342FCDWR provides fail-safe low-default outputs essential for power-stage disable; versus ADUM1402ARWZ, it delivers 25× higher data rate and 28× higher CMTI - making it optimal for real-time motor control and high-noise factory networks.
Availability
ISO7342FCDWR is available at Aetrix Electronics and suitable for industrial fieldbus nodes, servo amplifier feedback interfaces, PLC I/O modules, and isolated DC-DC converter supervision requiring stable component supply across extended temperature and high-EMI conditions.
Supply support for ISO7342FCDWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ISO734x family was designed specifically for robust industrial isolation - emphasizing EMC resilience, wide-temperature operation, and safety certification compliance in motor control, programmable logic, and factory automation systems.
FAQ
What is the isolation voltage rating of the ISO7342FCDWR?
The ISO7342FCDWR is rated for 3000 VRMS isolation for 1 minute per UL 1577 and 4242 VPK per VDE V 0884-10. These values reflect reinforced insulation capability validated through production testing and safety certification - critical for protecting human operators and low-voltage control circuitry in industrial equipment. The ISO7342FCDWR achieves this using a silicon dioxide (SiO₂) barrier with >13 µm internal clearance.
Does the ISO7342FCDWR support both 3.3-V and 5-V supplies simultaneously?
Yes, the ISO7342FCDWR supports independent 3.3-V or 5-V operation on each side: VCCI/GNDI powers the input side, and VCCO/GNDO powers the output side. This allows direct interfacing between 3.3-V microcontrollers and 5-V peripheral stages without external level shifters. The ISO7342FCDWR maintains full 25 Mbps performance and 31 ns propagation delay across both supply combinations.
How does the 'F' in ISO7342FCDWR affect output behavior?
The 'F' suffix in ISO7342FCDWR denotes default-low output logic: when input power (VCCI) is lost or input signals are invalid, all four outputs (OUTA–OUTD) drive low. This fail-safe behavior is essential for disabling power stages in motor drives or cutting off actuator commands in safety-rated systems. In contrast, non-F variants like ISO7342CDWR default high - requiring explicit system-level validation for safe state assumptions.
What is the function of EN1 and EN2 pins on the ISO7342FCDWR?
EN1 controls the output state of forward-direction channels (OUTA and OUTB); EN2 controls reverse-direction outputs (OUTC and OUTD). Both pins are active-high: driving either low places its associated outputs in high-impedance state. This dual-enable architecture allows independent gating of bidirectional data paths - for example, disabling encoder feedback (forward) while retaining fault reporting (reverse) during diagnostic modes in the ISO7342FCDWR.
Can the ISO7342FCDWR replace optocouplers in Modbus RTU applications?
Yes, the ISO7342FCDWR is explicitly qualified for optocoupler replacement in Modbus RTU systems. Its 25 Mbps signaling rate exceeds Modbus RTU's 115.2 kbps requirement, and its 70 kV/μs CMTI rejects noise from adjacent 485 bus transceivers and power converters. With two forward channels for TX/RX and two reverse channels for RTS/CTS or status flags, the ISO7342FCDWR consolidates four discrete optocouplers into a single SOIC-16 footprint - improving reliability and board density.
ISO7342FCDWR 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:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- 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):
- 4.1ns
- Rise / Fall Time (Typ):
- 2.1ns, 1.7ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISO7342FCDWR FAQ
1.How can I place an order for ISO7342FCDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7342FCDWR 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 ISO7342FCDWR reliable?
The price and inventory of ISO7342FCDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7342FCDWR is usually 5 days.
3.What payment methods are accepted for ISO7342FCDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7342FCDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7342FCDWR?
ISO7342FCDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7342FCDWR 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 ISO7342FCDWR?
For technical support, including ISO7342FCDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7342FCDWR requirements.
6.How does Aetrix verify that ISO7342FCDWR is sourced from the original manufacturer or authorized distributors?
All ISO7342FCDWR 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 ISO7342FCDWR meets industry standards.
7.What is the process for return or replacement of ISO7342FCDWR?
All ISO7342FCDWR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7342FCDWR, 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 ISO7342FCDWR part is unused and in its original packaging.
Return procedure for ISO7342FCDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7342FCDWR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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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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