Texas Instruments ISO7320FCQDRQ1

Overview

ISO7320FCQDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified dual-channel digital isolator with capacitive isolation barrier, 3000 VRMS/4242 VPK isolation rating, 25 Mbps signaling rate, and fail-safe low-default output behavior. It provides galvanic isolation between input-side (VCCI/GNDI) and output-side (VCCO/GNDO) domains in motor control, servo interfaces, and isolated CAN transceiver power domains.

For engineers reviewing the ISO7320FCQDRQ1 datasheet, ISO7320FCQDRQ1 pinout, ISO7320FCQDRQ1 application, or ISO7320FCQDRQ1 equivalent, key selection criteria include its 33 ns typical propagation delay at 5 V, integrated noise filtering for harsh EMI environments, 65 kV/μs CMTI, and dual-supply operation across 3.3 V and 5 V domains with TTL-compatible thresholds.

Technical Context

The ISO7320FCQDRQ1 implements a dual-channel capacitive isolation architecture with separate high-frequency (100 kbps–25 Mbps) and low-frequency (DC–100 kbps) signal paths per channel. Each channel uses differential transient pulse encoding across silicon dioxide (SiO₂) insulation barriers, with internal oscillator-based PWM for DC/low-frequency signals and comparator-based edge detection for high-speed data.

It features independent input and output power domains (VCCI/GNDI and VCCO/GNDO), integrated input noise filtering, and fail-safe output behavior triggered by input-side power loss - defaulting to logic low due to the "F" suffix designation. The device meets VDE V 0884-10 reinforced insulation requirements with 13 µm minimum internal clearance and 4 mm creepage/clearance.

Key Specifications

Pinout & Package

Narrow-body SOIC-8 package (4.90 mm × 3.91 mm), surface-mount, with reinforced insulation barrier separating input-side (pins 1, 2, 3, 4) and output-side (pins 5, 6, 7, 8) terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel digital isolator applications.

Compared with ISO7320CQDRQ1 and SI8620ED-B-IS, the ISO7320FCQDRQ1 uniquely combines AEC-Q100 Grade 1 qualification, fail-safe low output, integrated noise filtering, and 65 kV/μs CMTI - making it the only option qualified for automotive inverter gate drive isolation without additional protection components.

Availability

ISO7320FCQDRQ1 is available at Aetrix Electronics and suitable for automotive motor control, servo interface, and isolated CAN transceiver applications requiring stable component supply across extended product lifecycles.

Supply support for ISO7320FCQDRQ1 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 designing analog, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.

The ISO732x-Q1 family was developed specifically for automotive-grade galvanic isolation in safety-critical systems, targeting motor control, battery management, and chassis electronics with AEC-Q100 Grade 1 reliability and reinforced insulation compliance.

FAQ

What does the "F" suffix in ISO7320FCQDRQ1 indicate?

The "F" suffix in ISO7320FCQDRQ1 specifies fail-safe low-default output behavior: when input-side power (VCCI) drops below 2.1 V, both outputs (OUTA and OUTB) transition to and hold logic low. This is confirmed in the Device Functional Modes table and distinguishes ISO7320FCQDRQ1 from the default-high ISO7320CQDRQ1 variant. The ISO7320FCQDRQ1 behavior prevents unintended activation in gate driver or enable circuits during brownout conditions.

Does ISO7320FCQDRQ1 support level translation between 3.3 V and 5 V domains?

Yes, ISO7320FCQDRQ1 supports true bidirectional level translation: VCCI can operate from 3.0 V to 5.5 V independently of VCCO, which also ranges from 3.0 V to 5.5 V. Input thresholds (VIH ≥2 V, VIL ≤0.8 V) and output drive strength (VOH/VOL specified at both 3.3 V and 5 V supplies) are guaranteed across this range. This enables direct interfacing between 3.3 V microcontrollers and 5 V peripheral ICs without external level shifters.

What is the minimum creepage and clearance for ISO7320FCQDRQ1 in PCB layout?

The ISO7320FCQDRQ1 SOIC-8 package provides minimum creepage and clearance of 4 mm between input-side (pins 1–4) and output-side (pins 5–8) terminals, as verified per DIN EN 60664-1 and VDE V 0884-10. PCB layout must maintain ≥4 mm isolation gap across the package body - including solder mask and copper - and avoid routing traces or vias beneath the isolation barrier. Grooves or slots may be added to increase effective creepage if board space is constrained.

How does the integrated noise filter in ISO7320FCQDRQ1 improve system robustness?

The integrated noise filter in ISO7320FCQDRQ1 suppresses input glitches shorter than 40 ns, as measured in Figure 9 of the datasheet. This eliminates false triggering caused by EMI coupling, relay contact bounce, or inductive switching noise - particularly critical in automotive fieldbus nodes and motor control feedback paths. Unlike external RC filters, it imposes no bandwidth penalty or timing uncertainty, preserving the full 25 Mbps data rate while reducing BOM count and board area.

Is ISO7320FCQDRQ1 certified for reinforced insulation per VDE V 0884-10?

Yes, ISO7320FCQDRQ1 is certified per VDE V 0884-10:2006-12 for reinforced insulation, with 4242 VPK isolation voltage, 13 µm minimum internal clearance (DTI), and 4 mm minimum creepage/clearance. Certification is documented in the Regulatory Information section, including VDE certificate number 40016131 and UL recognition file E181974. It meets CSA Component Acceptance Notice 5A and IEC 61010-1 for measurement equipment applications.