Skyworks Solutions Inc. SI8660EB-AU

Overview

SI8660EB-AU from Skyworks is a six-channel, unidirectional digital isolator with all inputs on VDD1 side and zero inputs on VDD2 side (6:0 configuration), rated for 2.5 kVRMS isolation, default high fail-safe output, and QSOP-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and operates across –40 to 125 °C with 2.5–5.5 V supply per side - deployed in battery management systems and isolated ADC interfaces where channel asymmetry and automotive-grade reliability are required.

For engineers reviewing the SI8660EB-AU datasheet, SI8660EB-AU pinout, SI8660EB-AU application, or SI8660EB-AU equivalent, this page delivers verified specifications, fail-safe mode behavior, CMTI performance (50 kV/µs), QSOP-16 land pattern compatibility, and automotive AEC-Q100 qualification - critical for high-voltage motor control and on-board charger designs requiring reinforced insulation and zero-defect manufacturing traceability.

Technical Context

The SI8660EB-AU implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its 6:0 channel architecture isolates six logic signals from a single domain (e.g., MCU GPIOs) to a secondary domain (e.g., gate drivers), with Schmitt-trigger inputs and independent undervoltage lockout on both VDD1 and VDD2 sides.

Fail-safe operation is hardwired via ordering option: SI8660EB-AU defaults to logic-high outputs when VDD1 is unpowered but VDD2 remains active - achieved via internal pull-ups on all six channels. This behavior is validated per Table 3.1 and Ordering Guide, distinguishing it from low-default variants like SI8660BB-AU.

Key Specifications

Pinout & Package

SI8660EB-AU uses a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm pitch, optimized for high-density automotive PCB layouts and compatible with JEDEC-standard reflow profiles (peak 260 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6601ARQZ and ISO6760QDWR, SI8660EB-AU uniquely combines automotive qualification, 150 Mbps bandwidth, QSOP-16 compactness, and default-high fail-safe behavior - making it optimal for next-generation EV power electronics where timing, size, and safety certification intersect.

Availability

SI8660EB-AU is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, traction inverters, and industrial motor drives requiring stable component supply with full automotive traceability and long-term lifecycle support.

Supply support for SI8660EB-AU 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 specifically for high-reliability automotive and industrial isolation - delivering RF-based digital isolation with AEC-Q100 qualification, 60-year lifetime, and reinforced insulation certification to replace optocouplers in safety-critical power systems.

FAQ

What is the default output state of SI8660EB-AU during VDD1 power loss?

The SI8660EB-AU is configured with default-high fail-safe operation: when VDD1 is unpowered but VDD2 remains active, all six outputs (OUT1–OUT6) assert logic high. This behavior is fixed by the "E" in the part number (per Table 1.1) and implemented via internal pull-up resistors - ensuring critical enable signals remain active during input-side brownout events in battery management systems.

Does SI8660EB-AU require external startup initialization or configuration?

No, SI8660EB-AU requires no startup initialization or register configuration. As an RF-based digital isolator, it begins transmitting valid data within 40 µs of VDD1/VDD2 reaching UVLO thresholds (per Table 4.2). This zero-config operation eliminates boot-time dependencies and simplifies system-level qualification for automotive ASIL-B applications.

What package type and footprint does SI8660EB-AU use?

SI8660EB-AU uses a QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height, 0.635 mm pitch) with RoHS-compliant lead finish and JEDEC-standard reflow profile compatibility (peak 260 °C). Its land pattern matches standard QSOP-16 footprints - verified in Skyworks' Document 206330A, Section 11 - enabling drop-in replacement for other QSOP-based isolators without PCB redesign.

How is SI8660EB-AU qualified for automotive applications?

SI8660EB-AU is AEC-Q100 Grade 0 qualified (–40 to +150 °C junction), manufactured using full automotive process flows with zero-defect methodology, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. Its top marking includes an automotive manufacturing code (first character N–Z), and it carries UL, VDE, and CQC certifications for 2.5 kVRMS reinforced insulation - meeting ISO 26262 hardware requirements for ASIL-B systems.

What is the maximum recommended data rate for SI8660EB-AU in continuous operation?

The SI8660EB-AU supports DC to 150 Mbps continuously, as confirmed in the Functional Description and Electrical Specifications (Table 4.2). At 150 Mbps with 5 V supplies, typical supply current is 5.5 mA per channel (33 mA total), and eye diagram integrity is maintained per Figure 2.3 - making it suitable for high-speed SPI, UART, and custom serial protocols in automotive power electronics without derating.