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Texas Instruments ISO7731QDBQRQ1
- Part No.:
- ISO7731QDBQRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISO7731QDBQRQ1.pdf
- Description:
- DGTL ISO 3000VRMS 3CH 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
ISO7731QDBQRQ1 from Texas Instruments is a reinforced triple-channel digital isolator for automotive systems, featuring 100Mbps data rate, ±100kV/μs CMTI, and 3000VRMS isolation rating in QSOP-16 package. It provides two forward and one reverse signal channels with independent enable pins, supporting battery management, traction inverter, and on-board charger interfaces under AEC-Q100 Grade 1 (–40°C to +125°C).
For engineers reviewing the ISO7731QDBQRQ1 datasheet, ISO7731QDBQRQ1 pinout, ISO7731QDBQRQ1 application, or ISO7731QDBQRQ1 equivalent, key selection criteria include channel directionality (2F/1R), QSOP-16 footprint compatibility, reinforced insulation certification (VDE 0884-17, UL 1577), and functional safety documentation support for ISO 26262 ASIL-B system integration.
Technical Context
The ISO7731QDBQRQ1 implements dual capacitive SiO₂ isolation barriers per channel, enabling reinforced insulation with 12.8kV surge immunity and >30-year lifetime at 400VRMS working voltage (DBQ package). Its architecture supports independent input/output supply domains (VCCI/VCCO) and bidirectional level translation across 2.25V–5.5V rails.
Channel configuration is fixed: IN1→OUT1, IN2→OUT2 (forward), and IN3←OUT3 (reverse), with EN1 controlling side-1 outputs and EN2 controlling side-2 outputs. Default output state is high when unpowered-critical for fail-safe BMS communication monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 100 Mbps maximum - enables real-time CAN FD and high-speed SPI isolation in EV powertrain control loops. |
| Isolation Rating | 3000 VRMS (UL 1577) - meets reinforced insulation requirements for 400 VRMS working voltage in QSOP-16 package per IEC 62368-1. |
| CMTI | ±100 kV/μs typical - ensures robust noise rejection in high-dV/dt environments like traction inverter gate drivers. |
| Supply Range | 2.25 V to 5.5 V per side - allows direct interfacing with 3.3V microcontrollers and 5V analog front-ends without level shifters. |
| Propagation Delay | 11 ns typical (5V) - supports tight-timing applications such as PWM feedback in DC/DC converters. |
| Power Consumption | 1.5 mA/channel @ 1 Mbps - reduces thermal load in space-constrained automotive modules like HVAC sensor nodes. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and battery-pack deployment. |
Pinout & Package
ISO7731QDBQRQ1 uses the QSOP-16 (DBQ) package: 4.90 mm × 3.90 mm body with 0.65 mm lead pitch, optimized for high-density automotive PCB layouts while maintaining 3.7 mm creepage/clearance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC | Input signals (side-1) | Three logic inputs: INA/INB forward, INC reverse - enables asymmetric signal routing in motor control feedback paths. |
| OUTA, OUTB, OUTC | Output signals (side-2) | Corresponding isolated outputs: OUTA/OUTB forward, OUTC reverse - supports bidirectional diagnostics in BMS cell monitoring. |
| EN1, EN2 | Output enable controls | EN1 disables side-1 outputs (OUTA/B/C); EN2 disables side-2 outputs - permits multi-controller arbitration and low-power sleep modes. |
| VCC1, VCC2 | Independent power supplies | VCC1 powers input-side circuitry; VCC2 powers output-side - eliminates ground loop coupling between MCU and high-voltage domain. |
| GND1, GND2 | Isolated reference grounds | GND1 references VCC1; GND2 references VCC2 - defines two galvanically separated domains essential for HV/LV interface safety. |
| NC (pins 6, 7, 11) | No-connect terminals | Unused pins - must remain unconnected per TI design guidelines to preserve CMTI and isolation integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | Qualified to DIN EN IEC 60747-17 (VDE 0884-17) and UL 1577 - enables single-component isolation barrier compliance for ASIL-B systems without external redundancy. |
| Automotive Qualification | AEC-Q100 Grade 1 certified - guarantees operation over full vehicle temperature range without derating in EV powertrain modules. |
| Functional Safety Support | Documentation available for ISO 26262 FMEDA and safety manual - accelerates safety case development for automotive ECU certification. |
| EMC Robustness | ±8 kV IEC 61000-4-2 contact ESD across barrier and system-level surge immunity - reduces need for external TVS diodes in cost-sensitive body electronics. |
| Low-Power Enable Control | EN1/EN2 pins reduce quiescent current to ≤2.2 mA (side-1) and ≤1.6 mA (side-2) in disable mode - extends battery life in always-on parking heater modules. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage measurement ADC outputs and pack contactor control signals in 400V–800V EV battery packs. IC Role / Device Role / Timing Role: Triple-channel isolator providing forward-path telemetry (INA→OUTA, INB→OUTB) and reverse-path fault signaling (INC←OUTC) with <11ns propagation delay. Use Value: Enables simultaneous high-resolution cell monitoring and fast-acting open-contact response (<100ns CMTI margin) without compromising ASIL-B diagnostic coverage. |
Use Scenario: Coupling gate driver signals and current-sense feedback between MCU and SiC MOSFET half-bridges in 200kW+ inverters. IC Role / Device Role / Timing Role: Forward-isolating PWM commands (INA/INB → OUTA/OUTB) and reverse-isolating desaturation fault alerts (INC ← OUTC) with independent enable control. Use Value: Maintains timing integrity across 100MHz switching frequencies while surviving 12.8kV surge transients during motor short-circuit events. |
| On-Board Charger (OBC) | HVAC Compressor Module |
|
Use Scenario: Isolating digital control signals between AC/DC and DC/DC stages in bi-directional OBCs handling 11kW–22kW charging. IC Role / Device Role / Timing Role: Providing reinforced isolation for phase-shifted PWM generation and isolated voltage regulation feedback with 2.25–5.5V level translation. Use Value: Eliminates ground-loop noise in high-frequency resonant LLC converters while meeting IEC 62368-1 reinforced insulation requirements for 600VRMS mains-connected equipment. |
Use Scenario: Interfacing HVAC controller MCU with high-voltage inverter driving PTC heaters and brushless DC compressors in 48V mild-hybrid architectures. IC Role / Device Role / Timing Role: Isolating speed command (forward), temperature feedback (forward), and overcurrent trip signal (reverse) across 400VRMS barrier. Use Value: Supports functional safety shutdown within <500ns of fault detection while operating continuously at 125°C ambient in engine bay mounting locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8631BB-B-IS | 3-channel, 100 Mbps, 3750 VRMS (SOIC-16), no reverse channel - all-forward configuration only. | Lacks reverse-direction capability; requires external logic for bidirectional fault signaling in BMS. | Select when only unidirectional signal isolation is needed and SOIC-16 footprint is preferred over QSOP-16. |
| ADUM3481ARSZ | 4-channel, 25 Mbps, 3750 VRMS (SOIC-16), 2F/2R configuration - higher channel count but lower speed. | Insufficient bandwidth for 100Mbps CAN FD or high-speed SPI in traction inverters. | Choose for cost-sensitive 25Mbps applications where extra channel and SOIC-16 compatibility outweigh speed limitations. |
Compared with ISO7731QDBQRQ1, Si8631BB-B-IS offers identical speed but lacks reverse-channel flexibility critical for automotive diagnostics, while ADUM3481ARSZ provides more channels at lower speed and higher package height - making ISO7731QDBQRQ1 optimal for space-constrained, high-bandwidth, bidirectional automotive isolation.
Availability
ISO7731QDBQRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply across automotive production lifecycles.
Supply support for ISO7731QDBQRQ1 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-grade ICs with decades of safety-certified isolation technology expertise.
The ISO773x-Q1 family was engineered specifically for ASIL-B automotive subsystems - delivering reinforced isolation, AEC-Q100 qualification, and functional safety documentation to accelerate EV/HEV power electronics development.
FAQ
What is the isolation rating and certification status of ISO7731QDBQRQ1?
ISO7731QDBQRQ1 has a 3000 VRMS isolation rating per UL 1577 and is certified to DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. It carries CSA, UL, CQC, and TUV certifications covering IEC 62368-1, IEC 60601-1, and GB 4943.1 standards - all documented in TI's official safety certificate files for DW and DBQ packages.
How does the channel directionality of ISO7731QDBQRQ1 differ from ISO7730QDBQRQ1?
ISO7731QDBQRQ1 implements two forward (INA→OUTA, INB→OUTB) and one reverse (INC←OUTC) channels, whereas ISO7730QDBQRQ1 has three forward-only channels. This asymmetry enables bidirectional communication - for example, using OUTC as a fault-reporting line from high-voltage domain back to MCU - a capability required in ISO7731QDBQRQ1-based BMS designs.
What are the supply voltage requirements and level-shifting capabilities of ISO7731QDBQRQ1?
ISO7731QDBQRQ1 supports independent 2.25V–5.5V supplies on both sides (VCC1/VCC2), enabling seamless level translation between 3.3V MCUs and 5V analog circuits. Input thresholds scale with VCCI (0.3× to 0.7×), and output drive strength adjusts automatically - eliminating external level shifters in mixed-voltage automotive ECUs.
Does ISO7731QDBQRQ1 support functional safety development for ISO 26262 systems?
Yes, ISO7731QDBQRQ1 is functional safety-capable with documentation available to aid ISO 26262 system design, including FIT rate data, failure mode analysis, and safety manual guidance. TI explicitly lists ISO7731-Q1 in its functional safety documentation suite for ASIL-B decomposition in automotive powertrain applications.
What is the default output state of ISO7731QDBQRQ1 during power loss?
ISO7731QDBQRQ1 defaults to high-output state on all channels when input power is lost - a critical fail-safe behavior for monitoring lines in battery management systems. This behavior is inherent to the "no-F" suffix variant and does not require external pull-ups, simplifying schematic design and improving reliability in safety-critical paths.
ISO7731QDBQRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 85kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 16ns, 16ns
- Pulse Width Distortion (Max):
- 4.9ns
- Rise / Fall Time (Typ):
- 1.3ns, 1.4ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
ISO7731QDBQRQ1 FAQ
1.How can I place an order for ISO7731QDBQRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7731QDBQRQ1 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 ISO7731QDBQRQ1 reliable?
The price and inventory of ISO7731QDBQRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7731QDBQRQ1 is usually 5 days.
3.What payment methods are accepted for ISO7731QDBQRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7731QDBQRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7731QDBQRQ1?
ISO7731QDBQRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7731QDBQRQ1 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 ISO7731QDBQRQ1?
For technical support, including ISO7731QDBQRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7731QDBQRQ1 requirements.
6.How does Aetrix verify that ISO7731QDBQRQ1 is sourced from the original manufacturer or authorized distributors?
All ISO7731QDBQRQ1 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 ISO7731QDBQRQ1 meets industry standards.
7.What is the process for return or replacement of ISO7731QDBQRQ1?
All ISO7731QDBQRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ISO7731QDBQRQ1, 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 ISO7731QDBQRQ1 part is unused and in its original packaging.
Return procedure for ISO7731QDBQRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7731QDBQRQ1 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
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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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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