Skyworks Solutions Inc. SI8663AB-AS1R

Overview

SI8663AB-AS1R from Skyworks is a six-channel automotive-grade digital isolator with 3 input channels on VDD1 side and 3 on VDD2 side, 150 Mbps data rate, <10 ns propagation delay, and 2.5 kVRMS isolation rating in narrow-body SOIC-16 package. It supports fail-safe low-default output mode and operates across –40 to 125 °C for battery management systems and traction inverters.

For engineers reviewing the SI8663AB-AS1R datasheet, SI8663AB-AS1R pinout, SI8663AB-AS1R application, or SI8663AB-AS1R equivalent, this page delivers verified electrical specs, automotive qualification evidence (AEC-Q100), isolation safety certifications (UL, VDE, CQC), and real-world timing performance including 0.5 ns channel-channel skew and 5 ns minimum pulse width.

Technical Context

The SI8663AB-AS1R implements RF-based on/off keying across a semiconductor isolation barrier-no optical components or startup initialization required. Its dual-supply architecture (VDD1/VDD2) enables galvanic separation between controller and power stage domains, with independent undervoltage lockout (UVLO) on each side.

Each of its six channels features Schmitt-trigger inputs for noise immunity, selectable fail-safe default state (low, per ordering code 'B'), and precise timing: 8 ns typical propagation delay, 1.5 ns pulse width distortion, and 2 ns propagation delay skew across temperature and voltage ranges.

Key Specifications

Pinout & Package

Narrow-body SOIC-16 (NB SOIC-16) package with 8.9 mm × 3.9 mm footprint, RoHS-compliant, 260 °C peak reflow compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8663BB-AS1R, SI8663AB-AS1R provides identical timing and isolation but guarantees fail-safe low output-critical for preventing unintended actuation in BMS fault states. Versus ADUM6603ARWZ, SI8663AB-AS1R delivers automotive qualification, tighter skew (0.5 ns vs. 3 ns), and lower power at 100 Mbps (16.4 mA vs. 22 mA).

Availability

SI8663AB-AS1R is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial PLC I/O modules requiring stable component supply with automotive-grade reliability and long-term lifecycle support.

Supply support for SI8663AB-AS1R 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 analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The SI8663AB-AS1R belongs to Skyworks' Si866x family of ultra-low-power digital isolators, engineered specifically for automotive and industrial applications demanding high noise immunity, precise timing, and long-term reliability under harsh thermal and EMI conditions.

FAQ

What is the isolation rating and safety certification status of SI8663AB-AS1R?

The SI8663AB-AS1R is rated for 2.5 kVRMS isolation and certified to UL 1577, VDE 0884-10 (reinforced), CSA Component Notice 5A, and CQC GB4943.1 standards. These approvals validate its use in safety-critical automotive and industrial systems where reinforced insulation is mandated by IEC 62368-1 and IEC 60601-1.

Does SI8663AB-AS1R require external startup initialization or configuration?

No, SI8663AB-AS1R requires no startup initialization or configuration. It begins transmitting valid data within 40 µs of power application (tSU ≤ 40 µs), with automatic UVLO management on both VDD1 and VDD2 sides. This zero-config behavior simplifies firmware design and eliminates boot-time race conditions in real-time control systems.

How does the fail-safe low default mode function in SI8663AB-AS1R during power loss?

In SI8663AB-AS1R, when the input-side supply (VDD1) is unpowered while VDD2 remains active, all six output channels default to logic low. This behavior is hardwired via internal pull-downs and prevents unintended activation of downstream drivers or actuators-essential for functional safety in battery management and motor control applications.

What is the maximum achievable data rate and associated timing performance of SI8663AB-AS1R?

SI8663AB-AS1R supports up to 150 Mbps per channel. At that rate, it delivers 5–13 ns propagation delay (min–max), 0.5 ns typical channel-channel skew, and 5 ns minimum pulse width-enabling reliable SPI clocking at 75 MHz and clean PWM edge transmission in high-frequency GaN/SiC inverter gate drives.

Is SI8663AB-AS1R compatible with 3.3 V and 5 V logic families on both sides simultaneously?

Yes, SI8663AB-AS1R supports independent 2.375–5.5 V supplies on VDD1 and VDD2 sides. It accepts 3.3 V logic inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and drives 5 V-tolerant outputs (VOH ≥ VDD–0.4 V, VOL ≤ 0.4 V), enabling seamless interfacing between 3.3 V MCUs and 5 V analog or power-stage circuits without external level shifters.