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Texas Instruments ISOW7742DFMR
- Part No.:
- ISOW7742DFMR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7742DFMR.pdf
- Description:
- LOW-EMISSIONS, LOW-RIPPLE, QUAD-
- Quantity:
- Payment:
- Shipping:
Inventory:3,817
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Product details
Overview
ISOW7742DFMR from Texas Instruments is a reinforced quad-channel digital isolator with integrated low-emission, low-noise DC-DC converter. It delivers 100 Mbps data rate, 5000 VRMS reinforced isolation, and up to 0.55-W isolated output power (5 V → 5 V @ 110 mA). The device operates across –40°C to +125°C and uses capacitive signal isolation plus on-chip transformer-based power isolation - enabling compact, emissions-compliant isolated interfaces in motor control and grid infrastructure.
For engineers reviewing the ISOW7742DFMR datasheet, ISOW7742DFMR pinout, ISOW7742DFMR application, or ISOW7742DFMR equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative options for space-constrained, high-EMC industrial designs requiring integrated isolated power and signal integrity.
Technical Context
The ISOW7742DFMR implements four independent digital isolation channels with configurable directionality: two forward (INA→OUTA, INB→OUTB) and two reverse (INC←OUTC, IND←OUTD), as confirmed by Figure 6-3 and pin mapping tables. Its integrated DC-DC converter operates at 25 MHz, delivering low-frequency switching noise and 24-mV peak-to-peak ripple under full load.
Isolation architecture combines double capacitive SiO₂ barriers for signal paths and thin-film polymer-insulated on-chip transformers for power transfer. Safety certification includes VDE-reinforced insulation per DIN VDE V 0884-11:2017-01, UL 1577 (5000 VRMS), and IEC 62368-1 - all validated for the ISOW7742 (not ISOW774xB) variant per Device Information table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 100 Mbps - supports high-speed UART, SPI, and RS-485 isolation without external clocking. |
| Isolation rating | 5000 VRMS reinforced - meets safety requirements for industrial mains-connected systems. |
| Integrated DC-DC output | 5 V @ 110 mA or 3.3 V @ 140 mA - eliminates need for external isolated DC/DC in compact PCB layouts. |
| CMTI | 100 kV/µs (typical) - ensures robust noise immunity against fast transients in motor drives and inverters. |
| Output ripple | 24 mV (pk-pk) at 110 mA - enables direct powering of sensitive analog front-ends or ADC references. |
| Operating temperature | –40°C to +125°C - supports deployment in under-hood automotive, solar inverters, and factory-floor controllers. |
| Emissions margin | >5 dB above CISPR 32 Class B on 2-layer board - reduces need for shielding or complex filtering. |
Pinout & Package
ISOW7742DFMR uses a 20-pin wide-body SOIC (DFM) package measuring 12.83 mm × 7.5 mm, with creepage/clearance >8 mm and reinforced insulation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB | Input channel A/B (forward) | Primary-side logic inputs driving OUTA/OUTB; compatible with 1.71–5.5-V VIO supply. |
| INC, IND | Input channel C/D (reverse) | Secondary-side logic inputs driving OUTC/OUTD; require VISOIN-supplied domain. |
| OUTA, OUTB | Output channel A/B (forward) | Isolated outputs referenced to VISOIN; drive loads up to ±4 mA at 5 V. |
| OUTC, OUTD | Output channel C/D (reverse) | Isolated outputs referenced to VIO; enable bidirectional communication across barrier. |
| VIO, GNDIO | Primary logic supply | 1.71–5.5-V domain powering input buffers and EN_IO1/EN_IO2 logic. |
| VDD, GND1 | DC-DC primary supply | 3–5.5-V input for integrated converter; GND1 must be shorted to GNDIO on PCB. |
| VISOIN, GND2 | Secondary logic supply | Isolated 3–6-V domain for output buffers; GND2 may be shorted to GISOIN or filtered via ferrite bead. |
| VISOOUT, VSEL | DC-DC secondary output | VSEL selects 5 V (shorted to VISOOUT) or 3.3 V (shorted to GND2); VISOOUT powers VISOIN domain. |
| EN/FLT | Power converter enable/fault | Configurable as active-high enable or open-drain fault alert (active-low) for system-level monitoring. |
| EN_IO1, EN_IO2 | Channel output enable | Independent tri-state control for side-1 and side-2 output drivers - supports dynamic power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated low-noise DC-DC | 25-MHz switching frequency minimizes interference with sensitive analog circuits and RF sections. |
| CISPR 32 Class B compliance | Validated >5 dB margin on 2-layer board - reduces layout iteration time and eliminates external EMI filters. |
| Reinforced isolation | 5000 VRMS withstand voltage and 1000 VRMS working voltage - certified for functional safety in medical and grid applications. |
| High CMTI | 100 kV/µs common-mode transient immunity - prevents data corruption during IGBT switching in motor drives. |
| Flexible power configuration | VSEL pin enables field-selectable 5 V or 3.3 V isolated output without hardware change. |
| System-level EMC protection | ±8 kV IEC 61000-4-2 contact discharge across barrier - simplifies end-equipment surge testing. |
Applications
| Motor Control Interface | Grid-Tied Inverter Monitoring |
|---|---|
|
Use Scenario: Isolating gate driver control signals and current-sense feedback between MCU and 3-phase IGBT stack in servo drives. IC Role / Device Role / Timing Role: Quad-channel isolator providing forward PWM commands (INA/INB → OUTA/OUTB) and reverse fault/status reporting (INC/IND ← OUTC/OUTD). Use Value: Eliminates separate isolated DC/DC, reduces BOM count by 2 components, and maintains 100 Mbps timing fidelity under 100-kV/µs transients. |
Use Scenario: Isolating communication and sensing lines between DSP controller and high-voltage DC-link monitoring circuitry in solar inverters. IC Role / Device Role / Timing Role: Signal isolator with integrated 5-V isolated rail powering ADC reference and isolated CAN transceiver on secondary side. Use Value: Meets IEC 62109 and UL 1741 requirements via 5000 VRMS reinforced insulation and CISPR 32 Class B emissions margin. |
| Industrial PLC Backplane | Medical Patient Monitoring |
|
Use Scenario: Galvanically isolating serial bus (RS-485) and digital I/O modules in modular programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional isolator supporting daisy-chained Modbus RTU with local 3.3-V isolated power for transceivers. Use Value: Enables single-component isolation + power solution per module slot, reducing footprint by 40% vs. discrete isolator + DC/DC combo. |
Use Scenario: Isolating ECG front-end analog signals and microcontroller UART in portable patient monitors requiring 2 MOPP protection. IC Role / Device Role / Timing Role: Reinforced isolator certified to IEC 60601-1 and CSA 60601-1 for patient-connected circuits. Use Value: Provides 250 VRMS working voltage and 7071 VPK transient immunity - satisfies critical leakage current and creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6420ARWZ | 4 forward channels only; no reverse I/O; 500 mW output; 2.5 kV RMS isolation; no CISPR 32 Class B validation. | Limited to unidirectional protocols (e.g., SPI master-slave); requires external filtering for emissions compliance. | Select when bidirectional channel flexibility is unnecessary and lower isolation rating suffices. |
| SI88642ED-IS | 4 forward channels; 500 mW output; 5 kV RMS isolation; integrated LDO instead of DC-DC; higher output ripple (50 mV). | Suitable for low-noise analog domains where DC-DC switching noise must be avoided entirely. | Prefer when ultra-low ripple is prioritized over efficiency and output current capability. |
Compared with ADUM6420ARWZ and SI88642ED-IS, the ISOW7742DFMR uniquely combines bidirectional channel routing, 100 Mbps speed, CISPR 32 Class B margin, and 5000 VRMS reinforced certification - making it optimal for high-integrity industrial and medical systems requiring both signal and power integration.
Availability
ISOW7742DFMR is available at Aetrix Electronics and suitable for motor control, grid infrastructure, and medical equipment requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for ISOW7742DFMR 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 connectivity technologies, serving industrial, automotive, and communications markets.
The ISOW77xx family was designed specifically to replace discrete isolator + isolated DC/DC combinations in space-constrained, high-EMC applications - targeting factory automation, energy infrastructure, and safety-critical medical systems.
FAQ
What is the channel configuration of ISOW7742DFMR?
The ISOW7742DFMR has two forward channels (INA→OUTA, INB→OUTB) and two reverse channels (INC←OUTC, IND←OUTD), as defined in Figure 6-3 and confirmed in the Pin Configuration table. This bidirectional arrangement supports protocols like UART and I²C without external direction-control logic, distinguishing it from unidirectional variants such as ISOW7740.
Does ISOW7742DFMR support 3.3-V logic on both sides?
Yes, ISOW7742DFMR supports independent 1.71–5.5-V VIO (primary side) and 3–6-V VISOIN (secondary side). When VSEL is tied to GND2, VISOOUT delivers 3.3 V ±5%, enabling direct powering of 3.3-V isolated peripherals - verified in Section 7.9 for 3.3-V output modes with 140 mA max load.
What safety certifications apply specifically to ISOW7742DFMR?
ISOW7742DFMR carries VDE-reinforced insulation per DIN VDE V 0884-11:2017-01, UL 1577 (5000 VRMS), IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1-2011 - all explicitly listed for ISOW774x (not ISOW774xB) in the Device Information table and Section 7.7.
How does the EN/FLT pin function in ISOW7742DFMR?
The EN/FLT pin on ISOW7742DFMR is multi-function: configured as an active-high enable input to start/stop the DC-DC converter, or as an open-drain fault output (active-low) signaling overvoltage, undervoltage, overload, or thermal shutdown. Its dual role is detailed in Section 6 pin descriptions and Section 9.3.3.
Can ISOW7742DFMR operate with VIO and VDD supplied from the same rail?
Yes, ISOW7742DFMR can operate with VIO and VDD connected to a shared 3–5.5-V supply, as stated in Section 5: "The ISOW774x can operate from a single supply voltage of 3 V to 5.5 V by connecting VIO and VDD together on PCB." This simplifies power design in cost-sensitive applications where separate supplies are not required.
ISOW7742DFMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ISOW774x
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 85kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 15.7ns, 15.7ns
- Pulse Width Distortion (Max):
- 5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.4ns
- Voltage - Supply:
- 2.97V ~ 3.63V, 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISOW7742DFMR FAQ
1.How can I place an order for ISOW7742DFMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7742DFMR 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 ISOW7742DFMR reliable?
The price and inventory of ISOW7742DFMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7742DFMR is usually 5 days.
3.What payment methods are accepted for ISOW7742DFMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7742DFMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7742DFMR?
ISOW7742DFMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7742DFMR 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 ISOW7742DFMR?
For technical support, including ISOW7742DFMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7742DFMR requirements.
6.How does Aetrix verify that ISOW7742DFMR is sourced from the original manufacturer or authorized distributors?
All ISOW7742DFMR 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 ISOW7742DFMR meets industry standards.
7.What is the process for return or replacement of ISOW7742DFMR?
All ISOW7742DFMR units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7742DFMR, 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 ISOW7742DFMR part is unused and in its original packaging.
Return procedure for ISOW7742DFMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7742DFMR 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
Texas Instruments
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