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ISO6720FQDWVRQ1: An Automotive Dual-Channel Digital Isolator
10/26/2026 12:11:59 AM
ISO6720FQDWVRQ1: An Automotive Dual-Channel Digital Isolator
1. Positioning
The ISO6720FQDWVRQ1 is an automotive-qualified dual-channel digital isolator from Texas Instruments' ISO672x-Q1 family. It transfers CMOS or LVCMOS digital signals across a double capacitive silicon dioxide (SiO₂) isolation barrier. Compared with optocoupler solutions, capacitive isolation offers clear advantages in data rate, lifetime, power consumption, and integration density. This variant uses a 2/0 channel configuration, meaning both channels transmit in the same direction from Side 1 to Side 2. It is suited to unidirectional signal transfer, such as passing status or enable signals from a high-voltage domain to a low-voltage domain.
The "F" suffix indicates a default output low (fail-safe low) state, whereas the standard ISO672x-Q1 has a default output high. This distinction matters in safety-relevant designs: when the input side loses power or the signal is absent, the isolator output enters its predefined default state, allowing the system to respond in a deterministic manner rather than floating or remaining indeterminate.
2. Key Electrical Parameters
On the isolation side, the ISO6720FQDWVRQ1 provides an isolation rating of up to 5000 VRMS in the DWV wide-body SOIC-8 package, with a working voltage lifetime specification of 1060 VRMS. Common-mode transient immunity (CMTI) is typically ±150 kV/µs, with a guaranteed minimum of 100 kV/µs, sufficient to preserve signal integrity in environments with violent common-mode excursions such as motor drives and inverters.
On the signal side, the maximum data rate is 50 Mbps, with a typical propagation delay of only 11 ns (18 ns maximum) and a maximum pulse width distortion of 7 ns. The supply range is split: Side 1 supports 1.71 V to 1.89 V (optimized for 1.8 V logic), while Side 2 supports 2.25 V to 5.5 V. This allows the device to perform direct level translation between 1.8 V and 3.3 V or 5 V systems without additional level shifters. Typical current consumption is 1.8 mA per channel at 1 Mbps, keeping power dissipation low.
3. Qualification and Safety Features
The ISO6720FQDWVRQ1 is qualified to AEC-Q100 Grade 1, with an ambient operating temperature range of -40°C to +125°C, and meets VDA320 automotive isolation requirements. On the regulatory side, it carries UL 1577 component recognition, DIN EN IEC 60747-17 (VDE 0884-17), IEC 62368-1, IEC 61010-1, and GB 4943.1 certifications, providing a ready foundation for system-level safety approvals. Texas Instruments also provides Functional Safety-Capable documentation to assist system designers with ISO 26262 safety arguments.
4. Key Specifications
| Parameter | Specification |
|---|---|
| Channel Configuration | 2 channels, 2/0 (all same direction) |
| Maximum Data Rate | 50 Mbps |
| Isolation Rating (VISO) | 5000 VRMS (DWV package) |
| Working Voltage Lifetime | 1060 VRMS |
| CMTI (typical / minimum) | ±150 kV/µs / 100 kV/µs |
| Propagation Delay (typical / max) | 11 ns / 18 ns |
| Pulse Width Distortion (max) | 7 ns |
| Supply Voltage (Side 1) | 1.71 V to 1.89 V |
| Supply Voltage (Side 2) | 2.25 V to 5.5 V |
| Default Output | Low (F suffix) |
| Current per Channel (1 Mbps) | 1.8 mA (typical) |
| Package | SOIC-8 DWV (wide body, 7.50 mm) |
| Operating Temperature | -40°C to +125°C |
| Automotive Qualification | AEC-Q100 Grade 1, VDA320 |
5. Questions and Answers
Q: What is the practical difference between a 2/0 configuration and a 1/1 configuration?
A: 2/0 means both channels transmit in the same direction, all from Side 1 to Side 2. It suits unidirectional communication, such as passing enable signals, fault flags, or status bits from a high-voltage microcontroller to a low-voltage domain. A 1/1 configuration has one forward and one reverse channel, suited to bidirectional handshaking or independent transmit and receive paths. The choice depends on signal-flow requirements in the system architecture, not on performance differences.
Q: Side 1 and Side 2 have different supply ranges. What does that mean for design?
A: Side 1's narrow 1.71–1.89 V range is optimized for 1.8 V logic interfaces, while Side 2's wide 2.25–5.5 V range connects to 3.3 V or 5 V systems. This means the device can natively perform 1.8 V to 3.3 V/5 V level translation without adding a separate level shifter alongside the isolator. In mixed-voltage systems, this simplifies the bill of materials and reduces board area.
Q: What is the difference between the 5000 VRMS isolation rating and the 1060 VRMS working voltage?
A: The isolation rating (VISO) is the voltage the device can withstand in a short-duration withstand test, used for regulatory voltage-withstand verification. The working voltage (VIOWM) is the voltage the device can sustain continuously over its expected lifetime, directly tied to long-term reliability. A 1060 VRMS working voltage means the isolator is suited to high-voltage battery systems or industrial buses requiring long-term isolation stress, while the 5000 VRMS rating provides margin for transient overvoltage and regulatory testing.
Q: Why is the "F" suffix's default low output particularly important?
A: In safety-relevant systems, the isolator's output must be deterministic when the input-side supply is lost or the signal line opens. A default low means the system can interpret it as a "disable," "off," or "fault" condition and trigger a safe action. If the default state were undefined, downstream logic could misinterpret a floating condition as a valid signal, leading to hazardous behaviour. The fail-safe low output of the ISO6720FQDWVRQ1 is designed precisely for such scenarios.
6. Typical Applications
The ISO6720FQDWVRQ1 targets automotive applications requiring galvanic isolation: status-signal transfer between the high-voltage and low-voltage sides of a battery management system (BMS), isolated communication interfaces in on-board chargers (OBC), fault feedback and enable control in motor inverters, isolated gate-drive signals in DC-DC converters, and isolation interfaces in body control modules and ADAS domain controllers. In these scenarios, the isolator is not merely transmitting data; it is also protecting low-voltage circuitry from high-voltage-side faults.
7. Conclusion
The value of the ISO6720FQDWVRQ1 lies not in maximizing any single parameter, but in integrating 5000 VRMS isolation, 50 Mbps data rate, 11 ns delay, 1.8 V logic compatibility, and AEC-Q100 Grade 1 qualification into a standard SOIC-8 package. For automotive designs that need unidirectional isolated signal transfer, mixed-voltage level translation, and a fail-safe default output, it provides a compact, safety-certified foundation with supporting functional safety documentation.
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