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Texas Instruments ISO7321FCQDRQ1
- Part No.:
- ISO7321FCQDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7321FCQDRQ1.pdf
- Description:
- DGTL ISO 3000VRMS 2CH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,698
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Product details
Overview
ISO7321FCQDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified dual-channel digital isolator with opposite-direction channel configuration (IN→OUT and OUT→IN), 3000 VRMS isolation, 25 Mbps signaling rate, and fail-safe low-default output behavior. It enables galvanic separation between high-noise motor control domains and sensitive MCU logic in EV traction inverters.
For engineers reviewing the ISO7321FCQDRQ1 datasheet, ISO7321FCQDRQ1 pinout, ISO7321FCQDRQ1 application, or ISO7321FCQDRQ1 equivalent, this page delivers verified pin functions, automotive-grade EMC performance (65 kV/μs CMTI), dual-supply level translation (3.3 V/5 V), and precise fail-safe timing behavior under input power loss.
Technical Context
The ISO7321FCQDRQ1 implements capacitive isolation using dual internal data paths: a high-frequency channel (100 kbps–25 Mbps) for fast signal transmission and a low-frequency PWM-modulated channel (DC–100 kbps) to preserve DC integrity across the SiO₂ barrier. Its opposite-direction topology supports bidirectional communication without external inversion logic.
Each channel features integrated noise filtering, TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), and independent 3.3 V/5 V supply domains (VCCI/VCCO). Fail-safe operation defaults outputs low during VCCI power loss, confirmed by tfs = 7.4 μs delay at 3.3 V and 7.5 μs at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000 VRMS per UL 1577 (1-min test); 4242 VPK per VDE V 0884-10 - certifies reinforced insulation for automotive battery systems up to 400 VRMS working voltage |
| Signaling Rate | 25 Mbps - supports real-time PWM feedback loops in servo drives and inverter gate drivers |
| Propagation Delay | 37 ns typical at 3.3 V - enables sub-100 ns closed-loop timing budgets in motor control applications |
| CMTI | 50 kV/μs typical at 3.3 V - suppresses false triggering from high dv/dt noise in IGBT/SiC switching nodes |
| Supply Current | 1.2 mA per channel at 1 Mbps / 3.3 V - reduces thermal load in space-constrained automotive ECUs |
| Default Output State | Low on VCCI power loss - ensures safe shutdown of downstream gate drivers or fault latches |
| Operating Temperature | –40°C to +125°C ambient - qualified for under-hood and inverter module mounting locations |
Pinout & Package
Narrow-body SOIC-8 package (4.90 mm × 3.91 mm), creepage/clearance ≥4 mm, DTI = 13 µm, CTI = 400 V - meets DIN EN 60112 requirements for reinforced insulation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCI | Input-side power supply | Provides 3.3 V or 5 V to input buffers and logic; decoupling required within 10 mm of pin |
| GNDI | Input-side ground reference | Return path for VCCI; must be isolated from GNDO by ≥4 mm PCB spacing |
| INA | Channel A input | TTL-compatible input (VIH ≥ 2 V); connects to MCU GPIO or PWM controller output |
| INB | Channel B input | Independent input for second signal path; opposite-direction pairing enables bidirectional bus isolation |
| VCCO | Output-side power supply | Supplies isolated side logic; supports level translation to 3.3 V or 5 V output domains |
| GNDO | Output-side ground reference | Return for VCCO; forms isolated domain with VCCO for driving gate drivers or CAN transceivers |
| OUTA | Channel A output | CMOS output (VOH ≥ 3.0 V @ 3.3 V, VOL ≤ 0.4 V); drives isolated gate driver enable or fault signals |
| OUTB | Channel B output | Complementary output to INB; configured as reverse-direction channel for feedback loop closure |
Key Features
| Feature | Design Value |
|---|---|
| Opposite-direction channel architecture | Enables full-duplex isolated communication without external inverters - reduces component count in CAN/CAN FD physical layer interfaces |
| Fail-safe low-default output (suffix F) | Guarantees OUTA/OUTB = low within 7.5 μs of VCCI collapse - prevents unintended gate turn-on in motor drive fault conditions |
| Integrated input noise filter | Suppresses <40 ns glitches - eliminates need for external RC filters in noisy industrial fieldbus environments |
| 65 kV/μs CMTI (5 V) | Withstands rapid common-mode transients from SiC switching - maintains signal integrity in 100 kHz+ inverter designs |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±4 kV / CDM ±1.5 kV - meets automotive ECU reliability requirements |
Applications
| Motor Control Inverters | Servo Drive Feedback Loops |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback between MCU and 3-phase IGBT/SiC modules in EV traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing bidirectional signal transfer: INA/OUTA carries PWM enable, INB/OUTB returns analog-to-digital converter status or fault flags. Use Value: Opposite-direction channels eliminate external inverters; 37 ns propagation delay enables tight current-loop timing; fail-safe low state prevents shoot-through during MCU reset. |
Use Scenario: Connecting position encoder interface (e.g., resolver-to-digital converter) to motion controller in robotic joint actuators. IC Role / Device Role / Timing Role: Isolates high-resolution position data (SPI or parallel) and direction commands across safety-critical boundaries in ASIL-B systems. Use Value: 25 Mbps rate supports 20-bit resolver feedback at >10 kHz update rates; 50 kV/μs CMTI rejects noise from nearby motor windings. |
| Automotive Battery Management Systems | Onboard Charger Control Interfaces |
Use Scenario: Isolating cell voltage monitoring ICs and pack contactor control signals in 400 V/800 V BEV battery packs. IC Role / Device Role / Timing Role: Transfers analog front-end ADC results and precharge/disconnect commands across isolation barrier while maintaining functional safety integrity. Use Value: 3000 VRMS rating satisfies reinforced insulation requirements for >600 V DC systems; AEC-Q100 Grade 1 ensures long-term reliability at 125°C ambient. |
Use Scenario: Interfacing AC-DC controller MCU with isolated DC-DC stage in bidirectional OBC modules. IC Role / Device Role / Timing Role: Carries phase-shift modulation commands and isolated voltage/current telemetry between primary and secondary controllers. Use Value: Dual 3.3 V/5 V supply domains allow direct connection to both MCU I/O and isolated gate driver supplies; low 1.2 mA/channel ICC enables compact thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7321CQDRQ1 | No 'F' suffix → default output is high on VCCI loss; identical pinout, isolation, and speed specs | Used where fail-safe high state is required (e.g., enabling safety relays) | Select ISO7321CQDRQ1 only if system architecture requires active-high fault signaling |
| SI8621ED-B-IS | 3.75 kV RMS isolation; 150 Mbps max rate; different SOIC-8 footprint (5.3 mm width); no AEC-Q100 Grade 1 certification | Targeted at industrial automation, not automotive; lacks automotive temperature and ESD validation | Choose SI8621ED-B-IS only for non-automotive designs requiring higher data rates and lower propagation delay |
Compared with ISO7321CQDRQ1, ISO7321FCQDRQ1 provides deterministic low-state fail-safe behavior critical for motor safety; versus SI8621ED-B-IS, it delivers certified automotive reliability and tighter CMTI but trades off maximum speed and package compatibility.
Availability
ISO7321FCQDRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV traction inverter control, and onboard charger interfaces requiring stable component supply across extended product lifecycles.
Supply support for ISO7321FCQDRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade isolation, power management, and signal chain solutions.
The ISO732x-Q1 family was designed specifically for automotive subsystems requiring reinforced isolation, including electric powertrain controls, battery monitoring, and ADAS sensor interfaces - emphasizing robustness, fail-safe behavior, and regulatory compliance.
FAQ
What does the 'F' suffix in ISO7321FCQDRQ1 indicate?
The 'F' suffix in ISO7321FCQDRQ1 specifies fail-safe low-default output behavior: when VCCI supply collapses, both OUTA and OUTB transition to low within 7.5 μs (at 5 V) or 7.4 μs (at 3.3 V). This is confirmed in the Device Functional Modes table and distinguishes ISO7321FCQDRQ1 from ISO7321CQDRQ1, which defaults high. The behavior is intrinsic to the part number and cannot be altered by external circuitry.
Does ISO7321FCQDRQ1 support level translation between 3.3 V and 5 V domains?
Yes, ISO7321FCQDRQ1 supports true bidirectional level translation: VCCI may operate at 3.3 V while VCCO operates at 5 V, or vice versa, across the full 3 V to 5.5 V range. Input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output drive strength (VOH ≥ 3.0 V at 3.3 V, VOL ≤ 0.4 V) are guaranteed under all valid supply combinations, enabling seamless interfacing between mixed-voltage automotive subsystems.
What is the minimum creepage and clearance for ISO7321FCQDRQ1 in PCB layout?
ISO7321FCQDRQ1 in the SOIC-8 (D) package has minimum creepage and clearance of 4 mm each, as specified in the Insulation and Safety-Related Specifications table. These values are measured terminal-to-terminal across air (clearance) and across the package surface (creepage). PCB layout must maintain ≥4 mm spacing between primary and secondary side copper, and avoid solder mask bridging over isolation gaps to preserve reinforced insulation integrity.
How does ISO7321FCQDRQ1 handle low-frequency or DC signals across the isolation barrier?
ISO7321FCQDRQ1 uses a dual-path architecture: high-frequency signals (100 kbps–25 Mbps) pass directly through a capacitive channel, while low-frequency and DC signals are pulse-width modulated (PWM) by an internal oscillator before crossing the barrier. A low-pass filter reconstructs the original signal on the output side. This ensures accurate DC-level preservation and glitch-free transmission of enable signals or fault latches without data loss.
Is ISO7321FCQDRQ1 qualified for ASIL-B or ASIL-C automotive safety levels?
ISO7321FCQDRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C), with VDE V 0884-10 reinforced insulation certification and 4242 VPK transient immunity - foundational requirements for ASIL-B and ASIL-C systems. While the device itself is not ISO 26262-certified, its failure modes, diagnostic coverage, and safety mechanisms (e.g., fail-safe output, thermal derating) support integration into ASIL-B/C architectures when used per TI's functional safety documentation (SIL-001).
ISO7321FCQDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 57ns, 57ns
- Pulse Width Distortion (Max):
- 4ns
- Rise / Fall Time (Typ):
- 2.4ns, 2.1ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7321FCQDRQ1 FAQ
1.How can I place an order for ISO7321FCQDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7321FCQDRQ1 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 ISO7321FCQDRQ1 reliable?
The price and inventory of ISO7321FCQDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7321FCQDRQ1 is usually 5 days.
3.What payment methods are accepted for ISO7321FCQDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7321FCQDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7321FCQDRQ1?
ISO7321FCQDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7321FCQDRQ1 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 ISO7321FCQDRQ1?
For technical support, including ISO7321FCQDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7321FCQDRQ1 requirements.
6.How does Aetrix verify that ISO7321FCQDRQ1 is sourced from the original manufacturer or authorized distributors?
All ISO7321FCQDRQ1 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 ISO7321FCQDRQ1 meets industry standards.
7.What is the process for return or replacement of ISO7321FCQDRQ1?
All ISO7321FCQDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ISO7321FCQDRQ1, 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 ISO7321FCQDRQ1 part is unused and in its original packaging.
Return procedure for ISO7321FCQDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7321FCQDRQ1 Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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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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ISO7741DWR
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ISO7741FDWR
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