Texas Instruments ISO7742FDBQR

Overview

ISO7742FDBQR from Texas Instruments is a reinforced quad-channel digital isolator with two forward and two reverse-direction signal channels, 100Mbps data rate, 5000VRMS isolation rating (DW package), and ±100kV/μs typical CMTI. It operates across 2.25V–5.5V supplies, supports level translation, and features enable pins for high-impedance output control-used in industrial motor drives and solar inverters requiring robust noise immunity.

For engineers reviewing the ISO7742FDBQR datasheet, ISO7742FDBQR pinout, ISO7742FDBQR application, or ISO7742FDBQR equivalent, key selection criteria include channel direction configuration (2F/2R), QSOP-16 package footprint, reinforced isolation certification per VDE 0884-17 and UL 1577, and default-low output behavior due to the "F" suffix.

Technical Context

The ISO7742FDBQR implements dual capacitive SiO₂ isolation barriers per channel, enabling reinforced insulation with >30-year lifetime projection at 1500VRMS working voltage. Its architecture supports independent input/output supply domains (VCCI/GNDI and VCCO/GNDO) and bidirectional signal flow across two isolated sides.

Each channel includes an enable input (EN1/EN2) that places corresponding outputs into high-impedance state when asserted low-critical for multi-controller bus arbitration. The device achieves ±8kV IEC 61000-4-2 contact ESD protection across the barrier and meets system-level surge (12.8kV), EFT, and emission requirements without external filtering.

Key Specifications

Pinout & Package

ISO7742FDBQR is housed in a 16-pin QSOP (DBQ) package measuring 4.90 mm × 6.0 mm, with creepage and clearance ≥3.7 mm. This surface-mount package supports automated assembly and provides reinforced isolation in compact industrial layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISO7742DBQR and ISO6442FQDR, ISO7742FDBQR offers balanced performance for cost-sensitive industrial designs requiring proven reliability, default-low safety behavior, and full VDE/UL certification-without demanding the highest speed or smallest size.

Availability

ISO7742FDBQR is available at Aetrix Electronics and suitable for industrial motor control, solar inverter gate driving, and medical power supply isolation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ISO7742FDBQR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The ISO774x family was designed specifically for high-reliability isolation in harsh electromagnetic environments-targeting motor drives, renewable energy systems, and safety-certified medical equipment.

FAQ

What does the "F" suffix in ISO7742FDBQR indicate?

The "F" suffix denotes default-low output behavior: when input power or signal is lost, all outputs of ISO7742FDBQR assert logic low. This fail-safe characteristic prevents unintended activation of downstream drivers or actuators during brownout or reset conditions-critical in motor control and medical power systems where uncontrolled output states pose safety risks. ISO7742FDBQR maintains this behavior across its full –55°C to +125°C operating range.

Does ISO7742FDBQR support bidirectional communication?

Yes-ISO7742FDBQR has two forward-direction channels (INA→OUTA, INB→OUTB) and two reverse-direction channels (INC←OUTC, IND←OUTD), enabling true bidirectional data flow across the isolation barrier. This architecture eliminates the need for separate isolators in half-duplex interfaces like isolated I²C, SPI, or custom control buses, reducing component count and PCB area while maintaining timing integrity (10.7 ns typical propagation delay).

What certifications apply to ISO7742FDBQR?

ISO7742FDBQR holds DIN EN IEC 60747-17 (VDE 0884-17) reinforced certification, UL 1577 component recognition, IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1 approvals. These cover safety-critical use in industrial automation, test equipment, and Class II medical devices. Certification applies specifically to the DBQ-16 package variant and is validated for 5000VRMS isolation (UL) and 1500VRMS working voltage (VDE).

Can ISO7742FDBQR operate with different supply voltages on each side?

Yes-ISO7742FDBQR supports independent 2.25V–5.5V supplies on VCC1 (input side) and VCC2 (output side), enabling seamless level translation between disparate logic families (e.g., 1.8V FPGA I/O to 5V microcontroller peripherals). This dual-supply capability also enhances fault containment: a short on one side does not disrupt operation of the other, preserving system uptime in redundant architectures.

How does the enable pin functionality work on ISO7742FDBQR?

ISO7742FDBQR features two enable pins-EN1 controls outputs OUTA/OUTB (side 1), and EN2 controls OUTC/OUTD (side 2). When either enable pin is driven low, its associated outputs enter high-impedance state, allowing multiple controllers to share a common bus without contention. This function operates independently of supply voltage and remains effective down to 2.25V, making it ideal for hot-swap and multi-master industrial networks.