Texas Instruments ISO7220MD

Overview

ISO7220MD from Texas Instruments is a dual-channel CMOS digital isolator with 150Mbps signaling rate, 1ns max channel-to-channel output skew, and 1ns max pulse-width distortion. It features independent 2.8V/3.3V/5V input/output supply domains (VCCI/VCCO), 4kV ESD protection, and operates across –40°C to +125°C for industrial automation interfaces requiring high-speed galvanic isolation.

For engineers reviewing the ISO7220MD datasheet, ISO7220MD pinout, ISO7220MD application, or ISO7220MD equivalent, this device supports critical timing-critical serial bus isolation in Modbus, Profibus™, and servo control systems where low jitter (<1ns typ at 150Mbps), high CMTI (50kV/μs typ), and failsafe logic-high output on input power loss are design requirements.

Technical Context

The ISO7220MD uses TI's silicon-dioxide (SiO₂) isolation barrier to provide 4000V_PK galvanic isolation per VDE 0884-17. Its differential comparator-based architecture delivers precise edge detection and periodic DC-refresh pulses every 4μs to maintain output state during input unpowering.

As an M-option variant, it employs CMOS V_CC/2 input thresholds without input noise filtering-enabling faster propagation delay (6–16ns) and lower pulse-width distortion (0.5–1ns) versus A/B/C variants, at the cost of reduced transient immunity margin in noisy environments.

Key Specifications

Pinout & Package

ISO7220MD is housed in an 8-pin SOIC (D package) with 4.9mm × 6mm footprint and 4.90mm × 3.91mm body size. The pinout follows the ISO7220x orientation: both channels flow in the same direction (INA→OUTA, INB→OUTB), enabling straight PCB trace routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM120N0BRZ and SI8620ED-B-IS, ISO7220MD uniquely supports asymmetric 2.8V/5V supply combinations and guarantees ≤1ns channel skew-making it optimal for time-sensitive dual-signal isolation where supply flexibility and deterministic timing are non-negotiable.

Availability

ISO7220MD is available at Aetrix Electronics and suitable for factory automation, servo control interfaces, and isolated data acquisition systems requiring stable component supply, long-term lifecycle assurance, and compliance with industrial safety standards.

Supply support for ISO7220MD 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 specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.

The ISO722x family was engineered specifically for high-speed, safety-certified galvanic isolation in industrial control systems-emphasizing low skew, robust CMTI, and failsafe behavior under fault conditions.

FAQ

What is the maximum signaling rate supported by ISO7220MD?

The ISO7220MD supports up to 150Mbps signaling rate, verified under 5V/5V supply conditions with 150Mbps PRBS NRZ data. This enables direct isolation of high-speed serial interfaces such as SPI clock lines operating above 50MHz or real-time encoder feedback streams without protocol conversion or buffering.

Does ISO7220MD require matched input and output supply voltages?

No-ISO7220MD supports independent VCCI and VCCO supplies ranging from 2.8V (C-grade), 3.3V, or 5V each. For example, VCCI can be 3.3V for MCU-side logic while VCCO is 5V for actuator-side drivers, eliminating external level shifters and simplifying mixed-voltage system design.

How does the failsafe mechanism work in ISO7220MD?

The ISO7220MD monitors DC-refresh pulses across its SiO₂ barrier every 4μs. If these pulses cease-indicating input-side power loss or disconnection-the output stage drives both OUTA and OUTB to logic high within 3μs, providing a defined safe state for downstream logic in PLC or safety relay applications.

What safety certifications apply to ISO7220MD?

ISO7220MD is certified to DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation, UL 1577 (2500VRMS withstand), and IEC 61010-1/IEC 62368-1. These approvals validate its use in safety-critical industrial equipment where galvanic isolation must withstand 4000VPK transients and maintain functional safety integrity.

Is ISO7220MD pin-compatible with other ISO7220x variants?

Yes-ISO7220MD shares identical 8-pin SOIC (D package) pinout and footprint with ISO7220A, ISO7220B, and ISO7220C. However, its CMOS V_CC/2 input thresholds and absence of input noise filtering differentiate its timing behavior and noise immunity profile from TTL-threshold variants.