Texas Instruments ISO7720D

Overview

ISO7720D from Texas Instruments is a dual-channel, unidirectional digital isolator with reinforced isolation (3000 VRMS), 100 Mbps data rate, ±100 kV/μs CMTI, and dual 2.25–5.5 V supply capability. It features default-high output logic, operates from –55°C to +125°C, and is used in RS-485/RS-232/CAN bus isolation within industrial motor drives and solar inverters.

For engineers reviewing the ISO7720D datasheet, ISO7720D pinout, ISO7720D application, or ISO7720D equivalent, key selection criteria include its 3000 VRMS narrow-SOIC isolation rating, unidirectional channel configuration, robust 12.8 kV surge immunity, and compatibility with 2.5 V/3.3 V/5 V level translation across isolated domains.

Technical Context

The ISO7720D implements dual capacitive SiO₂ isolation barriers with two independent CMOS input/output channels operating in the same direction (A→A′, B→B′). Its architecture supports asymmetric supply operation (VCCI ≠ VCCO) and includes integrated UVLO with 100 mV hysteresis to ensure reliable power-up/power-down behavior.

It achieves system-level EMC robustness via intrinsic high CMTI, ±8 kV IEC 61000-4-2 contact discharge protection across the barrier, and low emissions design-enabling compliance in harsh industrial environments without external filtering or shielding.

Key Specifications

Pinout & Package

ISO7720D is housed in an 8-pin narrow-body SOIC (D-8) package measuring 4.90 mm × 3.91 mm, optimized for high-density industrial PCBs with creepage/clearance ≥4 mm and DTI ≥17 µm.

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, ISO7720D delivers optimal balance of UL-certified 3000 VRMS isolation, compact D-8 footprint, and proven 12.8 kV surge resilience-making it preferred for cost-sensitive industrial designs requiring regulatory-ready safety without footprint penalty.

Availability

ISO7720D is available at Aetrix Electronics and suitable for industrial motor control, solar inverter communication, and medical patient monitoring requiring stable component supply and long-term lifecycle assurance.

Supply support for ISO7720D 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 isolation in noisy industrial environments-emphasizing robust EMC performance, extended lifetime insulation, and flexible supply-level translation across dual domains.

FAQ

What is the isolation rating and certification status of ISO7720D?

ISO7720D is UL 1577 certified for 3000 VRMS isolation in its D-8 package and meets DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. It carries CSA, CQC, and TUV certifications for IEC 62368-1 and IEC 61010-1, with 450 VRMS working voltage and 10 kV surge rating per IEC 62368-1 oil test. ISO7720D is not rated for medical 2 MOPP.

Does ISO7720D support different supply voltages on input and output sides?

Yes, ISO7720D supports independent 2.25 V to 5.5 V supplies on VCCI and VCCO pins, enabling seamless level translation-for example, interfacing a 3.3 V microcontroller to a 5 V RS-485 transceiver. This dual-supply flexibility is inherent to the ISO7720D architecture and requires no external components.

What is the default output state of ISO7720D during power loss?

ISO7720D has a default-high output configuration: both OUTA and OUTB drive high when either VCCI or VCCO is absent or below UVLO threshold. This fail-safe behavior is intrinsic to the ISO7720D silicon design and does not require external pull-ups. The ISO7720FD variant provides default-low output.

Can ISO7720D be used in CAN bus isolation applications?

Yes, ISO7720D is explicitly cited in TI documentation for CAN bus isolation when paired with isolated power supplies. Its 100 Mbps data rate, ±100 kV/μs CMTI, and low 11 ns propagation delay support CAN FD implementations up to 5 Mbps, and its 3000 VRMS rating satisfies IEC 62368-1 requirements for industrial CAN nodes.

What package options are available for ISO7720D?

ISO7720D is exclusively offered in the 8-pin narrow-body SOIC (D-8) package (4.90 mm × 3.91 mm). Other variants in the ISO772x family-such as ISO7720DW (16-pin wide-SOIC) and ISO7720DWV (8-pin wide-SOIC)-are distinct orderables with different footprints, creepage, and isolation ratings. ISO7720D refers only to the D-8 variant.