Skyworks Solutions Inc. SI8640ET-IS2

Overview

SI8640ET-IS2 from Skyworks is a quad-channel digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, and selectable high-default fail-safe output mode. It features Schmitt-trigger inputs, tri-state outputs with enable control, and operates across –40 to 125 °C in wide-body SOIC-16 (IS2) package with 8 mm creepage. Used in isolated ADC interfaces and motor control gate drivers where robust noise immunity and precise timing are critical.

For engineers reviewing the SI8640ET-IS2 datasheet, SI8640ET-IS2 pinout, SI8640ET-IS2 application, or SI8640ET-IS2 equivalent, key selection considerations include its 5 kVRMS reinforced VDE 0884-10 certification, 0.5 ns channel-channel skew, 10 ns max propagation delay, and compatibility with 2.5–5.5 V dual supplies on isolated sides.

Technical Context

The SI8640ET-IS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling deterministic DC-to-150 Mbps operation. Its architecture delivers best-in-class CMTI (≥60 kV/µs) and eliminates magnetic field sensitivity inherent in transformer-based isolators.

All four channels reside on the same input side (VDD1), with outputs referenced to VDD2. The single EN pin (EN1) controls all four outputs simultaneously into high-impedance state, supporting system-level power sequencing and safe shutdown during fault conditions.

Key Specifications

Pinout & Package

SI8640ET-IS2 uses a 16-pin wide-body SOIC package (IS2 variant) with 8 mm creepage distance achieved via tie-bar elimination while retaining standard land pattern. Package meets RoHS and JEDEC reflow Class 3 standards (260 °C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2402BRWZ and ISO6741QDWR, SI8640ET-IS2 delivers 6× higher data rate than the former and 3× higher than the latter, plus factory-configurable high-default fail-safe behavior essential for SIL-2-compliant shutdown sequences.

Availability

SI8640ET-IS2 is available at Aetrix Electronics and suitable for industrial automation systems, medical electronics, and isolated switch mode supplies requiring stable component supply across extended temperature and safety certification lifecycles.

Supply support for SI8640ET-IS2 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

Skyworks Solutions is a global semiconductor company specializing in high-performance analog and mixed-signal connectivity solutions for communications, industrial, and automotive markets.

The Si864x family was engineered specifically for high-reliability isolation in safety-critical systems-delivering reinforced insulation, ultra-low power, and sub-10 ns timing precision without optical or magnetic components.

FAQ

What is the isolation rating and certification status of SI8640ET-IS2?

SI8640ET-IS2 provides 5 kVRMS reinforced isolation certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for two means of patient protection (2× MOPP) in medical devices and reinforced insulation in industrial equipment. The IS2 package achieves 8 mm creepage without altering standard SOIC-16 land patterns.

Does SI8640ET-IS2 require startup initialization or configuration?

No, SI8640ET-IS2 requires no startup initialization or configuration. Its RF-based isolation architecture begins passing data immediately upon VDD1 and VDD2 reaching UVLO thresholds (typically within 40 µs). This zero-latency behavior eliminates boot-time uncertainty in safety-critical motor control and power supply monitoring applications where SI8640ET-IS2 is deployed.

How does the fail-safe default-high feature work in SI8640ET-IS2?

In SI8640ET-IS2, the "E" in the part number denotes factory-configured default-high output behavior. When VDD1 is unpowered but VDD2 remains active, OUT1–OUT4 assert logic high-ensuring active-low fault signals (e.g., IGBT desaturation alerts) remain asserted during input-side power loss. This behavior is hardwired and requires no external pull-ups or configuration registers.

What is the purpose of the EN1 pin on SI8640ET-IS2?

The EN1 pin on SI8640ET-IS2 is an active-high enable control located on the VDD2 side. When pulled low, it places all four outputs (OUT1–OUT4) into high-impedance state-allowing safe bus sharing, hot-swap capability, or coordinated shutdown in multi-isolator systems. EN1 has internal pull-up to VDD2, so it may be left floating if always enabled, but external control is recommended in noisy environments.

Can SI8640ET-IS2 operate with different supply voltages on each side?

Yes, SI8640ET-IS2 supports independent 2.5–5.5 V supplies on VDD1 and VDD2. This enables direct interfacing between 3.3 V microcontrollers (VDD1) and 5 V analog subsystems (VDD2) without level-shifting circuitry. Both supplies must meet minimum UVLO thresholds (≥2.24 V) for reliable operation, and each requires its own 0.1 µF bypass capacitor placed adjacent to the respective VDD/GND pair.