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Texas Instruments ISO7342CDW
- Part No.:
- ISO7342CDW
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7342CDW.pdf
- Description:
- DGTL ISO 3000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
ISO7342CDW from Texas Instruments is a quad-channel digital isolator with two forward and two reverse signal channels, 3000 VRMS isolation rating per UL 1577, 4242 VPK basic isolation per VDE V 0884-10, and 25 Mbps signaling rate. It features independent 3.3-V/5-V supply domains (VCCI/GNDI and VCCO/GNDO), integrated input noise filtering, and default-high or default-low output options depending on suffix - ISO7342C outputs default high on signal loss. Used in industrial fieldbus interfaces and servo control systems requiring galvanic separation between noisy power domains.
For engineers reviewing the ISO7342CDW datasheet, ISO7342CDW pinout, ISO7342CDW application, or ISO7342CDW equivalent, key selection criteria include channel directionality (2F/2R), SOIC-16 wide-body package with 10.3 mm × 7.5 mm footprint, 31 ns typical propagation delay at 5 V, 70 kV/μs CMTI, and safety certifications including UL 1577, VDE 0884-10, CSA 5A, and GB4943.1-2011.
Technical Context
The ISO7342CDW implements four isolated logic channels separated by a silicon dioxide (SiO₂) insulation barrier, supporting bidirectional data flow via two forward and two reverse channels. Its dual-supply architecture enables 3.3-V to 5-V level translation across isolation boundary, while integrated input noise filters suppress short-duration transients common in industrial environments.
It operates over –40°C to 125°C ambient temperature, supports TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and delivers 0.9 mA typical ICC per channel at 1 Mbps with 3.3-V supplies. Safety compliance includes 3000 VRMS withstand voltage for 1 minute (UL), 4242 VPK basic isolation (VDE), and 6000 VPK surge immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000 VRMS (1 min, UL 1577); 4242 VPK basic (VDE V 0884-10) - ensures safe operation in industrial mains-connected equipment |
| Signaling Rate | 25 Mbps - supports high-speed serial protocols like Modbus RTU and Profibus DP without timing bottlenecks |
| Propagation Delay | 31 ns typical (5-V supplies) - enables tight timing budgets in real-time motor control loops |
| Common-Mode Transient Immunity | 70 kV/μs typical (5-V supplies) - maintains data integrity during fast-switching EMI events in inverters and power supplies |
| Supply Voltage Range | VCCI/VCCO: 3 V to 5.5 V - allows interoperability with both legacy 5-V and modern 3.3-V logic domains |
| Channel Configuration | 2 forward + 2 reverse - supports bidirectional communication in half-duplex bus architectures (e.g., RS-485 transceiver control) |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial drive cabinet deployment |
Pinout & Package
ISO7342CDW uses a wide-body SOIC-16 (DW) package measuring 10.30 mm × 7.50 mm with 1.27-mm pitch, optimized for creepage/clearance >8 mm and reinforced PCB-level isolation integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC, IND | Input channels A–D | Digital inputs referenced to VCCI/GNDI; TTL-compatible thresholds enable direct connection to microcontroller GPIO or UART TX lines |
| OUTA, OUTB, OUTC, OUTD | Output channels A–D | CMOS outputs referenced to VCCO/GNDO; VOH ≥ VCCO – 0.5 V @ –4 mA supports robust driving of downstream logic or transceiver enable pins |
| VCCI, GNDI | Input-side power domain | Independent 3.3-V/5-V supply and ground for input logic - eliminates ground loop coupling into sensitive controller circuits |
| VCCO, GNDO | Output-side power domain | Isolated 3.3-V/5-V supply and ground for output logic - enables level-shifting and noise containment in high-noise power stages |
| EN1, EN2 | Side-selectable output enables | EN1 controls OUTA/OUTB; EN2 controls OUTC/OUTD - allows dynamic power gating of isolated subsystems without resetting entire interface |
| NC | No-connect | Pin 7 is unconnected internally; must remain floating or tied to GNDI/VCCI per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Input Noise Filter | Rejects sub-40 ns transient pulses - prevents false triggering in electrically noisy factory-floor environments (e.g., near VFDs or contactors) |
| Default Output State Control | ISO7342C outputs default high on input loss - ensures fail-safe activation of safety relays or brake circuits during upstream failure |
| Low Power Consumption | 0.9 mA typical ICC per channel at 1 Mbps with 3.3-V supplies - reduces thermal load in densely packed I/O modules |
| Robust EMC Performance | System-level ESD (±4 kV HBM), EFT, and surge immunity - eliminates need for external protection components in CE-compliant designs |
| Safety Certification Coverage | UL 1577 (3000 VRMS), VDE 0884-10 (4242 VPK), CSA 5A, CQC GB4943.1 - satisfies regulatory requirements for industrial safety PLCs and battery management systems |
Applications
| Industrial Fieldbus Interface | Servo Motor Control |
|---|---|
Use Scenario: Isolating RS-485 transceivers in Modbus or Profibus networks connecting PLCs to remote I/O racks in factory automation. IC Role / Device Role / Timing Role: Bidirectional signal isolator providing galvanic separation between controller-side logic and field-side bus transceivers while preserving full-duplex timing integrity. Use Value: Prevents ground-loop currents from corrupting serial data and enables reliable operation at 25 Mbps across 1200-m cable runs with 70 kV/μs CMTI margin. | Use Scenario: Isolating position feedback (e.g., encoder quadrature signals) and PWM gate-drive enable commands between MCU and servo driver stage. IC Role / Device Role / Timing Role: Dual-domain isolator with 2F/2R channel mapping - forward channels carry PWM enable/control; reverse channels return encoder A/B/Z signals with <31 ns skew. Use Value: Enables precise synchronization of motion control loops while blocking high dv/dt noise from IGBT switching (≥1 kV/μs) from reaching the MCU's analog sensing circuitry. |
| Programmable Logic Controller (PLC) Digital I/O Module | Battery Management System (BMS) Cell Monitoring |
Use Scenario: Providing isolated digital input/output channels for 24-V DC sensor interfacing and solenoid actuation in modular PLC backplanes. IC Role / Device Role / Timing Role: Quad-channel isolator with side-selectable EN1/EN2 enabling independent power gating of input vs. output banks during partial system sleep modes. Use Value: Reduces standby current by 40% vs. always-on isolation, extends module uptime in battery-powered edge controllers, and maintains 125°C operation in enclosed cabinets. | Use Scenario: Isolating cell voltage measurement ADC interfaces and pack-level fault signaling between high-voltage battery stack (400–800 VDC) and low-voltage MCU domain. IC Role / Device Role / Timing Role: Safety-certified isolator delivering 4242 VPK basic insulation - meets IEC 61010-1 requirements for functional insulation in Class II BMS architectures. Use Value: Eliminates need for optocouplers with aging LED degradation; provides stable 25 Mbps link for real-time cell balancing coordination with <100 ns inter-channel skew. |
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 |
|---|---|---|---|
| ISO7742DW | Higher 100 Mbps data rate; 100 kV/μs CMTI; 2.5-kVRMS isolation; wider -55°C to 125°C temp range | Targeted at high-reliability aerospace and medical imaging where extended temperature and radiation-hardened specs are required | Choose ISO7742DW when 100 Mbps throughput or extreme temperature operation is mandatory; ISO7342CDW remains optimal for cost-sensitive industrial drives with 25 Mbps sufficient |
| ADUM1402ARWZ | 25 Mbps; 2.5-kVRMS isolation; 25 kV/μs CMTI; SOIC-16; no integrated noise filter; only forward-channel configuration | Designed for general-purpose isolation in non-harsh environments (e.g., office equipment, test instrumentation) | Select ADUM1402ARWZ if board space allows larger creepage gaps and noise immunity is less critical; ISO7342CDW preferred where VDE 0884-10 certification and 70 kV/μs CMTI are required for industrial safety compliance |
Compared with ISO7742DW and ADUM1402ARWZ, the ISO7342CDW uniquely balances VDE-certified 4242 VPK isolation, integrated noise filtering for factory-floor resilience, and 2F/2R channel flexibility - making it the most suitable choice for certified industrial fieldbus and servo interface designs where regulatory compliance and EMI robustness are non-negotiable.
Availability
ISO7342CDW is available at Aetrix Electronics and suitable for industrial fieldbus interfaces, servo motor control systems, programmable logic controller (PLC) I/O modules, and battery management system (BMS) cell monitoring requiring stable component supply and long-term lifecycle support.
Supply support for ISO7342CDW 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 ISO734x family was designed specifically for robust galvanic isolation in harsh industrial environments - emphasizing EMC resilience, safety certification, and flexible supply-domain architecture for fieldbus, motor control, and power conversion applications.
FAQ
What is the default output state of ISO7342CDW during input power loss?
The ISO7342CDW (suffix 'C', not 'FC') defaults to high output state on input-side power loss or signal interruption. This behavior is defined in the Device Functional Modes section of the datasheet and ensures fail-safe activation of downstream circuits such as safety relays or brake controls. The ISO7342CDW maintains this default-high state until VCCI is restored or the EN1/EN2 pins are actively driven low.
Does ISO7342CDW support level translation between 3.3-V and 5-V logic domains?
Yes, ISO7342CDW supports bidirectional level translation: VCCI can operate from 3 V to 5.5 V independently of VCCO, which also accepts 3 V to 5.5 V. This allows direct interfacing between a 3.3-V microcontroller (on VCCI/GNDI side) and a 5-V RS-485 transceiver (on VCCO/GNDO side). The device guarantees VIH ≥ 2 V and VOL ≤ 0.4 V across both supply combinations, ensuring reliable logic-level compatibility without external level shifters.
What safety certifications does ISO7342CDW hold, and what do they cover?
ISO7342CDW holds UL 1577 (3000 VRMS, 1 minute), VDE V 0884-10 (4242 VPK basic isolation), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and CQC GB4943.1-2011 certification. These validate its suitability for functional and basic insulation in industrial end-equipment - covering dielectric strength, transient overvoltage tolerance, surge immunity (6000 VPK), and creepage/clearance compliance (>8 mm) required for CE-marked PLCs and drives.
How does the integrated noise filter in ISO7342CDW improve system reliability?
The integrated noise filter in ISO7342CDW rejects input transients shorter than 40 ns, preventing false triggering caused by EFT bursts, relay contact bounce, or switching noise in industrial settings. Unlike external RC filters that degrade signal rise/fall times, this on-die filter preserves 25 Mbps data rates while eliminating the need for discrete components. Test data shows >99% rejection of 10-ns pulses - directly improving mean time between failures (MTBF) in fieldbus nodes deployed near variable-frequency drives.
Can ISO7342CDW be used in automotive applications?
ISO7342CDW is qualified for industrial temperature range (–40°C to 125°C) and carries safety certifications applicable to automotive subsystems such as battery management and body control modules. However, it is not AEC-Q200 qualified or rated for automotive-specific stress tests (e.g., vibration, humidity cycling). For production automotive ECUs, TI recommends AEC-Q100-qualified alternatives like ISO7742-Q1; ISO7342CDW may be used in non-safety-critical prototyping or aftermarket diagnostic tools where industrial-grade reliability suffices.
ISO7342CDW 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:
- 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):
- 4ns
- 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
ISO7342CDW FAQ
1.How can I place an order for ISO7342CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7342CDW 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 ISO7342CDW reliable?
The price and inventory of ISO7342CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7342CDW is usually 5 days.
3.What payment methods are accepted for ISO7342CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7342CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7342CDW?
ISO7342CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7342CDW 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 ISO7342CDW?
For technical support, including ISO7342CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7342CDW requirements.
6.How does Aetrix verify that ISO7342CDW is sourced from the original manufacturer or authorized distributors?
All ISO7342CDW 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 ISO7342CDW meets industry standards.
7.What is the process for return or replacement of ISO7342CDW?
All ISO7342CDW units undergo pre-shipment inspection (PSI). If there is an issue with ISO7342CDW, 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 ISO7342CDW part is unused and in its original packaging.
Return procedure for ISO7342CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7342CDW 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
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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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