Blog de la compañía TI ISO7720 High-Speed Automotive Reinforced Dual-Channel Digital Isolators

Shenzhen Mingjiada Electronics Co., Ltd. supplies the TI ISO7720 high-speed automotive-grade enhanced dual-channel digital isolator.

The TI ISO7720 is a dual-channel unidirectional digital isolator from TI’s ISO772x-Q1 series of automotive-grade reinforced-insulation devices. Utilising SiO₂ dual-capacitor isolation gate technology, it offers excellent EMC immunity and is specifically designed for high-voltage isolation and noise-prone automotive electronics and industrial control applications. Both channels support unidirectional transmission (2 inputs, 2 outputs; 2/0 architecture). It supports the isolated transmission of digital signals such as GPIO and PWM, enabling digital signal isolation between high- and low-voltage domains as well as cross-domain level conversion. It blocks ground loop interference and high-voltage surges, thereby protecting the sensitive circuits of the main control MCU. It is suitable for high-voltage isolation applications subject to severe interference, such as automotive power domains, BMS (Battery Management Systems), on-board inverters and industrial servo drives.

I. ISO7720 Product Specification Details
1. Channel Configuration: Dual-channel unidirectional (2 inputs, 0 outputs) digital isolation; the ISO7720 defaults to a high output level; the ISO7720F-Q1 defaults to a low output level upon power loss, meeting safety shutdown requirements.
2. Transmission Performance: Maximum data rate of 100 Mbps; typical propagation delay of 11 ns, maximum 17 ns; maximum output skew between channels of 4 ns, maximum skew between devices of 4.5 ns; typical rise/fall time of 3.9 ns; supports isolated transmission of PWM, GPIO and CAN/LIN digital control signals.
3. Isolation Specifications (Reinforced Insulation)
- DW/DWV packages: 5,000 Vrms isolation withstand voltage (UL1577), surge withstand voltage up to 12.8 kVpk
- D package: 3,000 Vrms isolation withstand voltage, surge withstand voltage up to 4,242 Vpk
- Estimated service life of the isolation barrier > 30 years at an operating voltage of 1.5 kVrms; Certifications: UL 1577, VDE, TÜV, CSA, CQC; compliant with functional safety system design documentation
4. Common-mode transient immunity (CMTI): typically ±100 kV/μs; maintains stable communication under high-voltage power switch transient noise; suitable for high-noise environments in automotive power conversion.
5. Power Supply and Level Conversion: Dual independent power domains; single-channel power supply of 2.25 V to 5.5 V; supports level conversion between different voltage domains on either side (2.25 V ↔ 5.5 V); compatible with 3.3 V/5 V in-vehicle MCUs and power-side logic levels; Typical single-channel power consumption of 1.7 mA at a data rate of 1 Mbps; the low-power design reduces in-vehicle standby power consumption.
6. Automotive-grade reliability (ISO 7720-Q1)
- AEC-Q100 Grade 1 automotive certification; operating temperature: –40 °C to +125 °C
- ESD: HBM 3A grade, CDM C6 grade, compliant with automotive electrostatic discharge protection standards
7. Package options: SOIC-8 (D/DWV), SOIC-16 (DW); supplied in tape-and-reel packaging, suitable for SMT automated placement.

II. Key Features of the ISO7720
1. High-speed signal transmission: Data rate up to 100 Mbps, typical propagation delay of 11 ns, maximum of 17 ns; maximum output skew between channels of 4 ns, maximum skew between devices of 4.5 ns; suitable for high-precision PWM and high-speed digital signal isolation transmission.
2. Enhanced Isolation Safety Certification: DW/DWV packages offer an isolation withstand voltage of up to 5,000 Vrms, whilst the D package provides 3,000 Vrms; compliant with UL 1577 and certified for enhanced insulation by VDE, TÜV, CSA and CQC; At an operating voltage of 1.5 kVrms, the estimated service life of the isolation barrier exceeds 30 years, with surge immunity up to 12.8 kV, ensuring high isolation reliability.
3. Exceptional common-mode transient immunity: typical CMTI of ±100 kV/μs, effectively suppressing ground potential transients on both the high- and low-voltage sides; operates stably in high-noise environments such as motors and automotive power circuits; low radiated emissions, meeting stringent EMC requirements.
4. Wide supply voltage range: Independent power domains on both sides, with a supply voltage range of 2.25 V to 5.5 V. Supports 3.3 V and 5 V cross-domain level conversion. Features built-in under-voltage lock-out (UVLO) protection; the output is latched in the event of abnormal voltage to prevent false triggering.
5. Automotive-grade version ISO7720-Q1: Certified to AEC-Q100 automotive standards, with an operating temperature range of –40°C to 125°C, suitable for wide-temperature automotive operating conditions. Designed for high-reliability automotive electronic applications such as ADAS, on-board chargers and battery management systems.

III. ISO7720 Principles and Architecture
The device features two independent digital buffered channels internally, separated by an SiO₂ capacitive isolation layer, achieving complete electrical isolation between the primary and secondary sides and blocking ground loop interference and high-voltage crosstalk. The dual-channel design operates in the same direction, with both signals transmitted from the isolated input side to the output side, making it suitable for dual-channel PWM drive and dual-channel synchronous GPIO signal isolation. It does not incorporate an isolated power supply and must be used in conjunction with an external isolated power supply module.

IV. Typical Application Scenarios for the ISO7720
- Automotive electronics: BMS (Battery Management System), on-board OBC (On-Board Charger), main drive inverters, high-voltage domain controllers (ISO7720-Q1 automotive-grade variant)
- Industrial automation: servo drives, variable frequency drives, PLC digital I/O isolation
- Energy storage converters, high-voltage monitoring and data acquisition units, signal isolation for industrial power supplies

V. ISO7720 Procurement, Selection and Buyer’s Guide
1. Model Selection and Differentiation
- ISO7720-Q1: Dual-channel co-directional, high-level output upon power loss, automotive AEC-Q100 Grade 1, the primary choice for automotive applications;
- ISO7720F-Q1: Dual-channel co-directional, high-level output upon power loss, safety-critical architecture, forcibly pulls signal low in the event of a fault; preferred for BMS safety circuits;
- Suffix DW/DWV: 5000 Vrms high isolation, for high-voltage safety applications; suffix D: 3000 Vrms, cost-optimised solution;
- Non-Q1 version ISO7720: Industrial grade, temperature range –55 to 125 °C; not suitable for automotive safety-related systems.
Comparison within the same series: ISO7721/ISO7721-Q1 feature one positive and one negative bidirectional channel; these should be selected when bidirectional signal isolation is required. Do not confuse them with the ISO7720 dual-channel unidirectional version.

2. Key Considerations for Selection
1. Insulation Class: For automotive power domains and the high-voltage side of the BMS, the reinforced insulation version must be selected; the DW/DWV package rated at 5,000 Vrms meets vehicle safety regulations. For low-voltage auxiliary circuits, the D package rated at 3,000 Vrms may be selected to reduce costs.
2. Output State Selection: For functional safety and fail-safe designs, prioritise the ‘F’ suffix (low output when power is off); for standard control signals, use the standard ISO7720-Q1.
3. Signal Bandwidth: High-speed PWM control signals and high-speed digital I/O support up to 100 Mbps; there is ample bandwidth headroom for low-speed GPIO and status acquisition.
4. Supporting Solutions: Digital isolators do not include an isolated power supply; the design must incorporate an isolated power supply module (such as the TI DCP0105B or ADUM isolated power supply) to form a complete isolation chain.
5. PCB Design: Strictly adhere to creepage and electrical clearance specifications; no copper traces may be laid beneath the isolation zone to ensure safety clearance distances are maintained.

3. Procurement Risk Advisory
1. For automotive-grade models, ensure the -Q1 suffix is present; industrial-grade models must not be used as substitutes in automotive projects, as the absence of AEC-Q100 certification will result in failure of the complete vehicle certification;
2. Distinguish between original chips, refurbished components and salvaged parts; batch and wafer traceability documentation for automotive-grade devices must be complete;
3. Assess lead times in advance; for automotive projects, it is recommended to secure stock well in advance to mitigate fluctuations in overseas original manufacturers’ production capacity;
4. During the sample phase, prioritise applications for DWV packaging; finalise the production specification only after testing EMC and safety performance.

VI. Mingjiada Electronics: ISO7720 Supply Quality and Delivery Assurance
Shenzhen Mingjiada Electronics has specialised in component distribution for nearly thirty years and possesses a mature supply chain capability for automotive-grade components. We can stably supply the full range of TI ISO7720 models, whilst also providing BOM fulfilment and obsolete stock recovery services.

1. Quality Control
Traceability of Genuine Products: Sourced directly from TI’s official channels; all ISO7720-Q1 components are brand-new and genuine, with no refurbished, loose new or dismantled parts; batch Certificates of Conformity (COCs) and original factory test reports are provided, ensuring full batch traceability and meeting automotive manufacturers’ IQC inspection requirements.
Full Inspection upon Receipt: Upon arrival, we conduct inspections of appearance, silkscreen markings, packaging and batch verification; for automotive-grade components, we additionally verify the AEC-Q100 marking to eliminate non-conforming batches. Our warehouse maintains a constant temperature and humidity environment with MSL control to prevent moisture damage to components.
Certification and Compliance: The company holds ISO 9001 quality management system certification and can provide quality inspection certificates for dispatch, meeting the supply chain audit requirements of automotive Tier 1 suppliers and BMS manufacturers.

2. Stock and Delivery Capabilities
1. Coordinated operations across dual warehouses in Shenzhen and Hong Kong, with ISO 7720-Q1 compliant stock always available, covering mainstream DW/DWV/D packages, to support samples, small-batch trial production and large-scale mass production orders;
2. Delivery lead times: Standard orders from stock are dispatched within 1–3 days; urgent R&D or trial production orders are prioritised for rapid dispatch, with shipment within 24 hours; overseas orders are supported via DDP door-to-door logistics;
3. Flexible cooperation models: Sample orders from as little as one piece, small-batch trial production, long-term framework agreements with fixed pricing and delivery schedules, and VMI inventory management, catering to the entire lifecycle from R&D prototyping to mass production for complete vehicles.

3. Supporting Value-Added Services
1. Technical Selection Support: Hardware engineers assist in distinguishing between ISO7720-Q1, ISO7720F-Q1 and ISO7721-Q1, and provide pinout, isolation safety standards and EMC application references;
2. One-stop BOM fulfilment: We can supply a full range of materials, including TI isolated power supplies, automotive-grade MCUs, CAN transceivers, resistors and capacitors, thereby reducing the costs associated with managing multiple suppliers;
3. Stock buy-back service: We can assess and purchase project surplus and obsolete automotive-grade ICs, helping to utilise customers’ idle stock and reduce overall project costs.

VII. Summary of ISO7720
As an automotive-grade, enhanced dual-channel co-directional digital isolator, the TI ISO7720 features high CMTI, 100 Mbps bandwidth and enhanced insulation safety characteristics, making it the preferred digital isolation solution for BMS, OBC and on-board power conversion in new energy vehicles. Shenzhen Mingjiada Electronics can supply genuine ISO7720 components from stock, with full batch traceability, stable delivery times and technical support for component selection. We also provide BOM matching and the recycling of obsolete components, helping to build a stable component supply chain for automotive electronics customers.