Skyworks Solutions Inc. SI8663BB-AUR

Overview

SI8663BB-AUR from Skyworks is a six-channel, ultra-low-power digital isolator with 3 input channels on VDD1 side and 3 output channels on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 2.5 kVRMS isolation rating in QSOP-16 package. It features Schmitt trigger inputs, selectable fail-safe low-default output mode, and operates across –40 to 125 °C for industrial motor control and isolated power supply monitoring.

For engineers reviewing the SI8663BB-AUR datasheet, SI8663BB-AUR pinout, SI8663BB-AUR application, or SI8663BB-AUR equivalent, this page delivers verified specifications, QSOP-16 terminal mapping, automotive-grade AEC-Q100 qualification context, and real-world timing performance metrics including 0.5 ns channel-channel skew and 5 ns minimum pulse width.

Technical Context

The SI8663BB-AUR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-supply architecture (VDD1/VDD2 = 2.5–5.5 V) supports independent operation of input and output sides, with undervoltage lockout (UVLO) thresholds at 1.95 V (rising) and 1.88 V (falling) per side.

Each of its six bidirectional-capable channels uses Schmitt-trigger inputs for >0.44 V hysteresis and delivers 50 Ω nominal output impedance. The device achieves 50 kV/µs common-mode transient immunity (CMTI) and maintains stable timing-10 ns typical propagation delay, 1.5 ns pulse width distortion, and 2 ns propagation delay skew-across temperature and voltage.

Key Specifications

Pinout & Package

SI8663BB-AUR is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height), optimized for high-density PCB layouts with 0.635 mm pitch and 8 mm creepage distance. Pin functions are validated per Skyworks datasheet Section 5 (Pin Descriptions) and Table 1.1 (Ordering Guide).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6630ARQZ and ISO6763QDWR, SI8663BB-AUR delivers 6× higher data rate, 2× better CMTI, AEC-Q100 Grade 1 qualification, and factory-configurable fail-safe behavior-making it optimal for next-generation EV power electronics and high-bandwidth industrial automation.

Availability

SI8663BB-AUR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and automotive on-board chargers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for SI8663BB-AUR 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.

The Si866x family was engineered to replace optocouplers with CMOS-based digital isolators delivering superior speed, power efficiency, and reliability across harsh operating conditions-from factory floors to electric vehicle powertrains.

FAQ

What is the isolation rating and safety certification of SI8663BB-AUR?

SI8663BB-AUR provides 2.5 kVRMS isolation and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10, and CQC GB4943.1 standards. It meets reinforced insulation requirements per IEC 62368-1 and IEC 60601-1, making it suitable for medical and industrial safety-critical applications. The QSOP-16 package achieves 8 mm creepage to satisfy these certifications.

Does SI8663BB-AUR support both 3.3 V and 5 V operation?

Yes, SI8663BB-AUR operates across 2.5–5.5 V on both VDD1 and VDD2 supplies. It delivers specified timing and power performance at 3.3 V (e.g., 16.4 mA per side at 100 Mbps) and 5 V (e.g., 21.3 mA per side at 100 Mbps), enabling seamless integration with mixed-voltage systems such as 3.3 V MCUs driving 5 V gate drivers.

How does the fail-safe mode function in SI8663BB-AUR?

SI8663BB-AUR is ordered with factory-set low-default output behavior. When VDD1 is unpowered or below UVLO threshold (1.88 V), outputs OUT1–OUT3 remain logic low while VDD2 is powered-ensuring safe shutdown of downstream circuits. This behavior is hardwired and requires no external configuration or pull resistors.

What is the channel configuration of SI8663BB-AUR?

SI8663BB-AUR has three input channels on the VDD1 side (IN1–IN3) and three output channels on the VDD2 side (OUT1–OUT3), enabling asymmetric signal routing across the isolation barrier. This 3:3 configuration is ideal for bidirectional control interfaces such as isolated SPI clock/data lines or redundant sensor signal paths.

Is SI8663BB-AUR qualified for automotive applications?

Yes, SI8663BB-AUR carries the "-A" suffix indicating full AEC-Q100 Grade 1 qualification (–40 to 125 °C), AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. It is built using automotive-specific process flows and zero-defect methodology, targeting on-board chargers, battery management systems, and traction inverter controls.