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Texas Instruments ISOW7742QDFMRQ1
- Part No.:
- ISOW7742QDFMRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7742QDFMRQ1.pdf
- Description:
- AUTOMOTIVE, LOW-EMISSIONS, QUAD-
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
ISOW7742QDFMRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified quad-channel digital isolator with integrated low-emission, low-noise DC-DC converter, delivering up to 140mA at 3.3V isolated output, 100Mbps data rate, and 100kV/µs CMTI - deployed in battery management systems and traction inverters for EV/HEV powertrain applications.
For engineers reviewing the ISOW7742QDFMRQ1 datasheet, ISOW7742QDFMRQ1 pinout, ISOW7742QDFMRQ1 application, or ISOW7742QDFMRQ1 equivalent, this page delivers verified automotive-grade isolation parameters, SOIC-WB 20-pin terminal mapping, CISPR25-compliant emissions performance, and validated alternatives for BMS and OBC designs requiring reinforced insulation and system-level ESD/surge immunity.
Technical Context
The ISOW7742QDFMRQ1 implements dual-isolation architecture: capacitive SiO₂ barriers for signal channels (four independent CMOS/LVCMOS I/O pairs) and thin-film polymer-insulated on-chip transformers for power conversion. Its 25MHz low-frequency switching enables low noise and <24mV pk-pk ripple at full load.
It supports independent supply domains: VIO (1.71–5.5V) for logic-side I/O, VDD (3–5.5V) for primary-side power conversion, and VISOIN/VISOOUT for secondary-side isolation - with VSEL pin selecting 3.3V or 5V isolated output voltage and EN/FLT serving as configurable enable/fault indicator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 100 Mbps - supports high-speed CAN FD, SPI, and digital control loops without timing bottlenecks. |
| CMTI | 100 kV/µs (typical) - ensures robust operation in noisy motor drive and inverter environments. |
| Isolated output power | 0.55 W max - eliminates need for external isolated DC-DC, reducing BOM count and board area in space-constrained EV modules. |
| VISOOUT options | 3.3 V or 5 V selectable via VSEL pin - enables direct interface with 3.3V MCU peripherals or 5V analog front-ends without LDOs. |
| Output current capability | 140 mA @ 3.3 V - sufficient to power isolated ADCs, gate drivers, or sensor interfaces in BMS cell monitoring units. |
| EMC immunity | ±8 kV IEC 61000-4-2 contact discharge across barrier - meets automotive system-level ESD requirements without external protection. |
| Safety certifications | VDE 0884-17 (reinforced), UL 1577, IEC 62368-1, IEC 60601-1, GB 4943.1 - certified for functional safety-critical subsystems. |
Pinout & Package
ISOW7742QDFMRQ1 uses a 20-pin wide-body SOIC (DFM) package measuring 12.83 mm × 10.30 mm, with creepage/clearance >8 mm and DTI >120 µm for transformer-based power isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC, IND | Input channels A–D (side 1) | LVCMOS-compatible digital inputs referenced to VIO/GNDIO; support 1.71–5.5V logic levels. |
| OUTA, OUTB, OUTC, OUTD | Output channels A–D (side 2) | Isolated LVCMOS outputs referenced to VISOIN/GND2; default-low behavior confirmed for ISOW7742-Q1 variant. |
| VIO, GNDIO, GND1 | Primary-side logic supply domain | VIO powers input buffers and EN_IOx controls; GNDIO and GND1 must be shorted on PCB per layout guidelines. |
| VDD, EN/FLT, VSEL | Power converter control interface | VDD supplies DC-DC primary; EN/FLT acts as enable input or open-drain fault alert; VSEL selects VISOOUT voltage (GND2 = 3.3V, VISOOUT = 5V). |
| VISOIN, VISOOUT, GND2, GISOIN | Secondary-side isolated power domain | VISOIN feeds isolator outputs; VISOOUT delivers regulated isolated power; GND2/GISOIN may be shorted or ferrite-bead filtered to suppress common-mode noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated low-noise DC-DC | 25 MHz switching frequency + <24 mV ripple enables clean power for precision ADCs and analog sensors without external filtering. |
| CISPR25 emission compliance | Optimized layout and internal filtering meet Class 5 radiated emissions limits - reduces need for external ferrites or shielding in automotive ECUs. |
| Dual independent supply domains | VIO (1.71–5.5V) and VDD (3–5.5V) allow mixed-voltage system integration - e.g., 1.8V FPGA I/O with 5V isolated power rail. |
| Reinforced insulation barrier | VDE 0884-17 certified SiO₂ + polymer hybrid isolation supports 5000 VRMS withstand and 1000 VRMS working voltage - suitable for functional safety up to ASIL-D subsystems. |
| Comprehensive protection suite | Includes soft-start, UVLO/OVLO, thermal shutdown, short-circuit, and overload protection - prevents latch-up and damage during transient faults in traction inverter gate drive circuits. |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
|
Use Scenario: Isolating cell voltage measurement and balancing signals between high-voltage battery stack and low-voltage MCU. IC Role / Device Role / Timing Role: Quad-channel isolator provides galvanic separation for four independent sensing channels while powering isolated ADCs and reference buffers via integrated 3.3V/140mA DC-DC. Use Value: Eliminates external isolated power supply, reduces component count by ≥3 parts, and maintains ±0.1% measurement accuracy under 100kV/µs transients. |
Use Scenario: Signal and power isolation between AC/DC PFC controller and DC/DC LLC stage in bidirectional OBC. IC Role / Device Role / Timing Role: Transmits PWM timing and fault signals across isolation barrier while supplying isolated gate driver bias from VISOOUT. Use Value: Enables compact, high-density OBC design with single-chip isolation + power, meeting CISPR25 Class 5 emissions without added filter stages. |
| Traction Inverter Control | DC/DC Converter Monitoring |
|
Use Scenario: Isolating gate drive signals and current sense feedback from IGBT/SiC half-bridge to MCU in 800V EV inverters. IC Role / Device Role / Timing Role: Delivers 100Mbps timing-critical PWM signals with 100kV/µs CMTI margin and powers isolated current shunt amplifier from VISOOUT. Use Value: Prevents ground-loop noise corruption of current sensing, enabling accurate torque control and overcurrent protection within 100 ns response window. |
Use Scenario: Monitoring output voltage/current and thermal status of high-efficiency 48V–12V DC/DC converters in vehicle domain controllers. IC Role / Device Role / Timing Role: Isolates telemetry data streams and provides local 3.3V power for isolated temperature sensors and ADCs on secondary side. Use Value: Supports ASIL-B diagnostic coverage with reinforced insulation and fault reporting via EN/FLT pin, reducing system-level validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88442ED-IS | No integrated DC-DC; requires external isolated power supply; 150 Mbps data rate; 5 kVRMS isolation rating. | Better suited for high-speed communication links where external power is already available; lacks integrated power simplification. | Select when higher data rate is critical and board space allows separate isolated DC-DC; not drop-in due to missing VISOOUT/VSEL pins. |
| ADUM6420ARWZ-RL | Integrated DC-DC delivers only 100 mA @ 5 V; lower efficiency (38%); no AEC-Q100 qualification; 25 kV/µs CMTI. | Targeted at industrial automation, not automotive; insufficient CMTI and safety certification for traction inverter use. | Consider only for non-automotive, cost-sensitive designs where 100 mA load and lower EMC robustness are acceptable. |
Compared with SI88442ED-IS and ADUM6420ARWZ-RL, ISOW7742QDFMRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 140 mA isolated power, CISPR25 compliance, and 100 kV/µs CMTI - making it the only single-package solution qualified for BMS cell monitoring and traction inverter gate drive in production EV platforms.
Availability
ISOW7742QDFMRQ1 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, traction inverters, and DC/DC converter monitoring requiring stable component supply across automotive production lifecycles.
Supply support for ISOW7742QDFMRQ1 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 automotive ICs, with decades of expertise in high-reliability isolation and power management solutions.
The ISOW774x-Q1 product line was designed specifically for automotive electrification systems - integrating signal isolation and low-noise isolated power into a single AEC-Q100-qualified package to simplify high-voltage subsystem design in EV/HEV powertrains.
FAQ
What is the maximum isolated output current supported by ISOW7742QDFMRQ1?
ISOW7742QDFMRQ1 delivers up to 140 mA at 3.3 V when VSEL is tied to GND2, and up to 110 mA at 5 V when VSEL is tied to VISOOUT. These values are specified under maximum load conditions with ≤1% load regulation and 24 mV pk-pk ripple - verified per TI's SLLSFK3A datasheet Section 5.9. The device sustains this output continuously across its –40°C to +125°C ambient range.
Does ISOW7742QDFMRQ1 support default-low output behavior?
Yes, ISOW7742QDFMRQ1 has default-low output behavior on all four channels when input signals are lost - confirmed in the Functional Description section of the datasheet. This differs from ISOW7741-Q1 (default-high) and is explicitly documented for the ISOW7742-Q1 variant in Figure 4-2 and Section 3 description.
How does ISOW7742QDFMRQ1 achieve CISPR25 compliance?
ISOW7742QDFMRQ1 achieves CISPR25 Class 5 radiated emissions compliance through optimized 25 MHz low-frequency switching, internal EMI filtering, and layout techniques that minimize common-mode currents. The datasheet confirms emission optimization per CISPR25 in Section 1 Features, and recommends ferrite beads on VISOIN/VISOOUT for further attenuation in demanding layouts.
What safety certifications apply to ISOW7742QDFMRQ1?
ISOW7742QDFMRQ1 holds VDE 0884-17 (DIN EN IEC 60747-17) reinforced insulation certification, UL 1577 component recognition, IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1 - all listed in Section 5.7 of the official datasheet. These cover isolation barrier integrity, surge immunity (10 kVPK), and system-level safety for automotive and medical applications.
Can ISOW7742QDFMRQ1 operate with independent VIO and VDD supplies?
Yes, ISOW7742QDFMRQ1 supports fully independent VIO (1.71–5.5 V) and VDD (3–5.5 V) supplies - enabling mixed-voltage operation such as 1.8 V FPGA I/O with 5 V DC-DC primary. This is explicitly defined in Section 1 Features and Section 3 Description, and validated in Recommended Operating Conditions (Section 5.3).
ISOW7742QDFMRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ISOW774x-Q1
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISOW7742QDFMRQ1 FAQ
1.How can I place an order for ISOW7742QDFMRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7742QDFMRQ1 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 ISOW7742QDFMRQ1 reliable?
The price and inventory of ISOW7742QDFMRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7742QDFMRQ1 is usually 5 days.
3.What payment methods are accepted for ISOW7742QDFMRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7742QDFMRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7742QDFMRQ1?
ISOW7742QDFMRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7742QDFMRQ1 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 ISOW7742QDFMRQ1?
For technical support, including ISOW7742QDFMRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7742QDFMRQ1 requirements.
6.How does Aetrix verify that ISOW7742QDFMRQ1 is sourced from the original manufacturer or authorized distributors?
All ISOW7742QDFMRQ1 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 ISOW7742QDFMRQ1 meets industry standards.
7.What is the process for return or replacement of ISOW7742QDFMRQ1?
All ISOW7742QDFMRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7742QDFMRQ1, 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 ISOW7742QDFMRQ1 part is unused and in its original packaging.
Return procedure for ISOW7742QDFMRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7742QDFMRQ1 Tags
-
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
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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