Texas Instruments ISO7720DW

Overview

ISO7720DW from Texas Instruments is a reinforced dual-channel digital isolator with 5000 VRMS isolation rating (UL 1577), 100 Mbps data rate, ±100 kV/μs CMTI, and dual 2.25–5.5 V supply operation. It features same-direction channel configuration (A→A, B→B), default-high outputs, and is used in RS-485/RS-232/CAN bus isolation within industrial motor drives and solar inverters.

For engineers reviewing the ISO7720DW datasheet, ISO7720DW pinout, ISO7720DW application, or ISO7720DW equivalent, key selection criteria include reinforced isolation rating (5000 VRMS), DW-package thermal resistance (86.5°C/W), dual-supply level translation capability, and system-level ESD/surge immunity compliance per IEC 61000-4-2 and IEC 62368-1.

Technical Context

The ISO7720DW implements dual capacitive SiO₂ isolation barriers with double-capacitor series architecture per channel, enabling reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17). Its input and output sides operate independently at 2.25–5.5 V, supporting bidirectional level translation without external components.

It integrates UVLO detection with 2.25 V rising threshold and 100–200 mV hysteresis, plus robust EMC design achieving ±8 kV contact ESD across the barrier and 12.8 kV surge (oil test). Propagation delay is 11 ns typical at 5 V, with 1.7 mA/channel current draw at 1 Mbps.

Key Specifications

Pinout & Package

ISO7720DW uses a 16-pin Wide-SOIC (DW) package measuring 10.30 mm × 7.50 mm, with creepage/clearance of 8 mm and internal DTI ≥17 µm. Thermal resistance is RθJA = 86.5°C/W on standard test board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM120N0BRZ-RL7 and SI8620ED-B-IS, the ISO7720DW uniquely combines 5000 VRMS reinforced isolation, 2.25 V operation, and ±100 kV/μs CMTI in a single DW package - making it optimal for high-noise, safety-certified industrial power systems where supply flexibility and transient immunity are co-critical.

Availability

ISO7720DW is available at Aetrix Electronics and suitable for industrial motor control, solar inverter interface, and medical imaging power supply applications requiring stable component supply across extended product lifecycles.

Supply support for ISO7720DW 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The ISO772x family was designed specifically for high-reliability galvanic isolation in harsh electromagnetic environments - targeting industrial automation, renewable energy, and safety-critical medical equipment where long-term barrier integrity and system-level EMC compliance are mandatory.

FAQ

What is the isolation rating and certification status of ISO7720DW?

The ISO7720DW has a 5000 VRMS isolation rating per UL 1577 and is certified to DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. It also holds IEC 61010-1, IEC 62368-1, IEC 60601-1, and GB 4943.1 certifications. These qualifications make ISO7720DW suitable for 2-MOPP medical systems and industrial equipment operating up to 600 VRMS working voltage. All certifications apply specifically to the DW-package variant.

Does ISO7720DW support level translation between different logic voltages?

Yes, ISO7720DW supports bidirectional level translation between 2.25 V and 5.5 V domains using independent VCC1 and VCC2 supplies. For example, it can interface a 3.3 V microcontroller (VCC1 = 3.3 V, GND1 referenced) with a 5 V peripheral (VCC2 = 5 V, GND2 referenced), with full signal integrity maintained up to 100 Mbps. This capability is inherent to the ISO7720DW's dual-supply architecture and does not require external resistors or translators.

What is the default output state of ISO7720DW during power loss?

The ISO7720DW has a default-high output configuration: when either VCC1 or VCC2 is absent or below UVLO threshold (1.7–1.8 V), both OUTA and OUTB drive high. This behavior is intrinsic to the ISO7720DW device variant (non-"F" suffix) and is specified in the Device Functional Modes section of its datasheet. It ensures fail-safe signaling in motor control enable lines and fault-reporting paths.

How does ISO7720DW achieve its 12.8 kV surge immunity?

ISO7720DW achieves 12.8 kV surge immunity through its double-capacitor SiO₂ isolation barrier and optimized package construction tested per IEC 62368-1 in oil. The 12.8 kV rating applies specifically to the DW package and is validated via VIOSM testing (1.2/50-µs waveform). This performance exceeds standard IEC 61000-4-5 requirements and enables direct use in AC-input power supplies and outdoor solar inverters without external TVS clamping on the isolation side.

Can ISO7720DW replace ISO7721DW in a design?

No - ISO7720DW and ISO7721DW differ in channel directionality: ISO7720DW has both channels unidirectional (INA→OUTA, INB→OUTB), while ISO7721DW has opposite-direction channels (INA→OUTB, INB→OUTA). Swapping them would invert signal routing. Additionally, ISO7721DW may have different default output polarity depending on suffix. Pin compatibility exists, but functional replacement requires schematic and firmware validation. Always verify channel mapping before substitution.