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Texas Instruments ISOW7742FQDFMRQ1
- Part No.:
- ISOW7742FQDFMRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7742FQDFMRQ1.pdf
- Description:
- AUTOMOTIVE, LOW-EMISSIONS, QUAD-
- Quantity:
- Payment:
- Shipping:
Inventory:569
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Product details
Overview
ISOW7742FQDFMRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified quad-channel digital isolator with integrated low-noise, low-emission DC-DC converter for automotive isolation. It delivers up to 140 mA at 3.3 V isolated output (VSEL = GND2), supports 100 Mbps data rate, features 100 kV/µs CMTI, and operates across –40°C to +125°C ambient temperature - deployed in battery management systems and traction inverters.
For engineers reviewing the ISOW7742FQDFMRQ1 datasheet, ISOW7742FQDFMRQ1 pinout, ISOW7742FQDFMRQ1 application, or ISOW7742FQDFMRQ1 equivalent, key selection criteria include integrated power capability (550 mW max), reinforced insulation certification (VDE 0884-17, UL 1577), SOIC-20 wide-body package footprint, and dual independent supply domains (VIO: 1.71–5.5 V; VDD: 3–5.5 V).
Technical Context
The ISOW7742FQDFMRQ1 integrates four galvanically isolated signal channels using double capacitive SiO₂ barriers and a transformer-based isolated DC-DC converter operating at 25 MHz. Its power stage includes soft-start, over-voltage/under-voltage lockout, short-circuit protection, and thermal shutdown - enabling robust operation without external isolated bias supplies.
Signal channels support independent enable control (EN_IO1/EN_IO2), configurable default output polarity (F-suffix = fail-low), and operate with logic supplies decoupled from power-converter rails. VISOIN and VISOOUT are externally connected via ferrite bead or LDO to suppress emissions and meet CISPR-25 Class 5 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 100 Mbps - enables high-speed CAN FD, SPI, or PWM signal isolation in real-time powertrain control loops. |
| Isolated Output Power | Up to 0.55 W - eliminates need for external isolated DC-DC, reducing BOM count and PCB area in space-constrained EV modules. |
| VISOOUT Options | 5 V (VSEL = VISOOUT) or 3.3 V (VSEL = GND2) - supports direct interfacing with MCU I/O or analog front-end ICs without level-shifting. |
| CMTI | 100 kV/µs (typical) - ensures reliable signal integrity in high-dV/dt environments like traction inverter gate drivers. |
| Insulation Rating | 5000 VRMS (UL), 1000 VRMS working voltage (IEC 62368-1) - meets reinforced insulation requirements for functional safety in ASIL-B/C systems. |
| Ambient Temp Range | –40°C to +125°C - qualified for under-hood and battery-pack mounting locations per AEC-Q100 Grade 1. |
| Package | 20-pin SOIC wide-body (DFM), 12.83 mm × 10.30 mm - provides >8 mm creepage/clearance for high-voltage system compliance. |
Pinout & Package
ISOW7742FQDFMRQ1 uses a 20-pin SOIC wide-body (DFM) package with 1.27 mm pitch, 12.83 mm × 10.30 mm body size, and reinforced insulation barrier separating primary (GND1/VIO/VDD) and secondary (GND2/VISOIN/VISOOUT) sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC, IND | Input channels A–D (primary side) | Digital inputs referenced to VIO/GNDIO; accept 1.71–5.5 V logic levels. |
| OUTA, OUTB, OUTC, OUTD | Output channels A–D (secondary side) | Isolated CMOS outputs referenced to VISOIN/GND2; default-low behavior (F-suffix). |
| VIO, GNDIO, GND1 | Primary logic supply domain | VIO powers input buffers and EN_IOx logic; GNDIO/GND1 must be shorted on PCB. |
| VDD, EN/FLT | DC-DC converter supply & control | VDD powers primary-side converter; EN/FLT serves as enable input or fault alert output (active-low). |
| VISOIN, VISOOUT, GND2, GISOIN | Secondary-side power domain | VISOIN supplies isolator outputs; VISOOUT delivers regulated isolated power; GND2/GISOIN may be shorted or filtered. |
| VSEL | VISOOUT voltage select | Connect to GND2 → 3.3 V output; connect to VISOOUT → 5 V output. |
| EN_IO1, EN_IO2 | Channel output enable controls | Independent enables for side-1 (OUTA–OUTD) and side-2 (INA–IND) output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Low-Noise DC-DC | 25 MHz switching frequency with <24 mVpp ripple at 140 mA - avoids interference with sensitive ADCs or current sensors. |
| CISPR-25 Emission Compliance | Optimized layout and internal filtering meet Class 5 radiated emission limits without external ferrites in most layouts. |
| System-Level EMC Robustness | ±8 kV IEC 61000-4-2 contact ESD across barrier; EFT/surge immunity built into architecture - reduces external protection component count. |
| Fail-Safe Default Output | F-suffix guarantees low-state outputs during input loss - critical for safe shutdown in BMS and inverter gate-drive interfaces. |
| Independent Supply Domains | VIO (1.71–5.5 V) and VDD (3–5.5 V) can be powered separately - enables mixed-voltage system integration (e.g., 1.8 V MCU + 5 V sensor). |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals between high-voltage battery stack and low-voltage MCU. IC Role / Device Role / Timing Role: Quad-channel isolator provides independent signal paths for voltage sensing, temperature reporting, and precharge/disconnect commands with fail-low safety. Use Value: Eliminates external isolated power supply while delivering 3.3 V @ 140 mA to isolated ADCs and gate drivers - reducing bill-of-materials and board area by >30% vs discrete solutions. |
Use Scenario: Isolating digital control signals (PWM, enable, fault) between OBC controller and high-side/low-side IGBT gate drivers in AC/DC and DC/DC stages. IC Role / Device Role / Timing Role: Provides timing-aligned, high-CMTI isolation for gate drive signals and feedback loops operating at up to 100 Mbps. Use Value: Integrated 5 V/110 mA or 3.3 V/140 mA isolated supply powers gate driver bias directly - avoiding noise coupling from shared power rails in multi-kW converters. |
| Traction Inverter | DC/DC Converter Control |
|
Use Scenario: Isolating phase current sensing, rotor position feedback, and IGBT gate control in motor drive inverters exposed to >1 kV/µs transients. IC Role / Device Role / Timing Role: Delivers 100 kV/µs CMTI and reinforced insulation to maintain signal integrity during fast-switching SiC MOSFET operation. Use Value: Enables compact, high-density inverter designs meeting ISO 26262 ASIL-B requirements without adding external isolation components or layout spacing overhead. |
Use Scenario: Isolating feedback signals (voltage/current sense) and control outputs (PWM, enable) between primary-side controller and secondary-side synchronous rectifiers. IC Role / Device Role / Timing Role: Provides bidirectional channel enable (EN_IO1/EN_IO2) and configurable VISOOUT to match secondary-side rail requirements (3.3 V or 5 V). Use Value: Reduces design complexity by integrating isolated power and signal paths in one SOIC-20 package - accelerating qualification for automotive 48 V–12 V DC/DC modules. |
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 |
|---|---|---|---|
| ISOW7741FQDFMRQ1 | Same pinout and specs, but with 4-channel configuration optimized for unidirectional signal flow (INA→OUTA, etc.) - no cross-channel routing. | Preferred when all four channels require identical directionality (e.g., four sensor inputs), not mixed Tx/Rx pairs. | Select ISOW7741FQDFMRQ1 if channel mapping matches fixed input→output topology; ISOW7742FQDFMRQ1 supports flexible bidirectional use per channel pair. |
| ADUM6420ARWZ-RL | 4-channel isolator with integrated 500 mW DC-DC; lower CMTI (50 kV/µs), no AEC-Q100 qualification, wider SOIC-20 package (10.3 mm vs 12.83 mm length). | Suitable for industrial automation, not automotive safety-critical systems requiring ASIL compliance. | Choose ADUM6420ARWZ-RL only for non-automotive applications where AEC-Q100 and 100 kV/µs CMTI are not required. |
Compared with ISOW7741FQDFMRQ1, ISOW7742FQDFMRQ1 offers reconfigurable channel directionality and identical automotive qualification; versus ADUM6420ARWZ-RL, it adds AEC-Q100 Grade 1, higher CMTI, and tighter emissions control - making it the sole option for ISO 26262-compliant EV powertrain subsystems.
Availability
ISOW7742FQDFMRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and DC/DC converter control requiring stable component supply across automotive production lifecycles.
Supply support for ISOW7742FQDFMRQ1 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 power management technologies with deep expertise in automotive-grade reliability and safety certification.
The ISOW774x-Q1 product line delivers integrated signal + power isolation for electric vehicle powertrain systems - designed specifically to replace discrete isolators and isolated DC-DCs in ASIL-B/C applications.
FAQ
What is the maximum load current supported by ISOW7742FQDFMRQ1 at 3.3 V isolated output?
ISOW7742FQDFMRQ1 delivers up to 140 mA at 3.3 V isolated output when VSEL is connected to GND2. This is verified under VDD = 5 V, ambient temperature ≤ 80°C, and includes margin for efficiency derating and thermal performance - sufficient to power isolated ADCs, gate drivers, or microcontrollers in automotive BMS modules.
Does ISOW7742FQDFMRQ1 support fail-safe default output behavior?
Yes, ISOW7742FQDFMRQ1 (with the 'F' suffix) guarantees low-state outputs on all four channels (OUTA–OUTD) when input signals are lost or power is interrupted. This fail-low behavior is confirmed in the device functional modes section of the datasheet and is essential for safe shutdown in traction inverter and contactor control applications.
Can ISOW7742FQDFMRQ1 operate with different supply voltages on its logic and power-converter sides?
Yes, ISOW7742FQDFMRQ1 supports independent supplies: VIO (1.71–5.5 V) for logic-side buffers and EN_IOx pins, and VDD (3–5.5 V) for the integrated DC-DC converter. This allows interfacing a 1.8 V MCU with a 5 V isolated power rail - a capability explicitly specified in Section 5.3 Recommended Operating Conditions.
What safety certifications does ISOW7742FQDFMRQ1 hold for automotive use?
ISOW7742FQDFMRQ1 holds VDE reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 component recognition, and system-level certifications including IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1 - all documented in Section 5.7 of the official TI datasheet SLLSFK3A.
How does the EN/FLT pin function in ISOW7742FQDFMRQ1?
The EN/FLT pin on ISOW7742FQDFMRQ1 serves dual roles: as an enable input (high = DC-DC active) or fault output (active-low alert). When used as input, it accepts logic-level signals from a microcontroller; when used as output, it requires a ≥5 kΩ pull-up resistor. This dual functionality is detailed in Section 4 Pin Configuration and Functions and Section 7.3.3 of the TI datasheet.
ISOW7742FQDFMRQ1 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
ISOW7742FQDFMRQ1 FAQ
1.How can I place an order for ISOW7742FQDFMRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7742FQDFMRQ1 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 ISOW7742FQDFMRQ1 reliable?
The price and inventory of ISOW7742FQDFMRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7742FQDFMRQ1 is usually 5 days.
3.What payment methods are accepted for ISOW7742FQDFMRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7742FQDFMRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7742FQDFMRQ1?
ISOW7742FQDFMRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7742FQDFMRQ1 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 ISOW7742FQDFMRQ1?
For technical support, including ISOW7742FQDFMRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7742FQDFMRQ1 requirements.
6.How does Aetrix verify that ISOW7742FQDFMRQ1 is sourced from the original manufacturer or authorized distributors?
All ISOW7742FQDFMRQ1 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 ISOW7742FQDFMRQ1 meets industry standards.
7.What is the process for return or replacement of ISOW7742FQDFMRQ1?
All ISOW7742FQDFMRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7742FQDFMRQ1, 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 ISOW7742FQDFMRQ1 part is unused and in its original packaging.
Return procedure for ISOW7742FQDFMRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7742FQDFMRQ1 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
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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