Skyworks Solutions Inc. SI8660BC-AS1R

Overview

SI8660BC-AS1R from Skyworks is a six-channel, unidirectional digital isolator with 3.75 kVRMS reinforced isolation, Schmitt-trigger inputs, selectable fail-safe low-default output, and operation from 2.5–5.5 V. It delivers 150 Mbps data rate, <10 ns propagation delay, and ultra-low power consumption (1.5 mA/channel at 1 Mbps, 2.5 V), enabling robust signal integrity in high-noise industrial motor drives and isolated power supplies.

For engineers reviewing the SI8660BC-AS1R datasheet, SI8660BC-AS1R pinout, SI8660BC-AS1R application, or SI8660BC-AS1R equivalent, this page provides verified technical context, real-world timing behavior, isolation safety certifications (UL, VDE, CQC), and validated alternative options for system-level design and BOM optimization.

Technical Context

The SI8660BC-AS1R implements RF-based on/off keying across a semiconductor isolation barrier-no optical components or startup initialization required. Its six channels are all input-side referenced (6 inputs on VDD1 side, 0 on VDD2), supporting unidirectional signal transfer with precise channel-to-channel skew ≤2.5 ns and pulse width distortion ≤4.5 ns.

It features independent undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ, hysteresis = 70 mV), Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V), and failsafe logic that holds outputs low during VDD1 loss while VDD2 remains powered-enabling safe shutdown in isolated DC-DC controllers.

Key Specifications

Pinout & Package

Narrow-body SOIC-16 package (NB SOIC-16), 7.5 mm body width, 1.27 mm pitch, RoHS-compliant, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6601ARWZ and ISO6760FDWR, SI8660BC-AS1R offers the highest data rate (150 Mbps) and lowest power at 2.5 V among narrow-body 6-channel isolators with 3.75 kVRMS rating-making it optimal for high-speed, low-power industrial and automotive control interfaces.

Availability

SI8660BC-AS1R is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply feedback, medical ADC interfaces, and battery management systems requiring stable component supply, AEC-Q100 qualification, and reinforced 3.75 kVRMS isolation.

Supply support for SI8660BC-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 Si866x family was designed specifically for high-reliability industrial and automotive isolation-emphasizing ultra-low power, precise timing, and safety-certified reinforced insulation in compact SOIC packages.

FAQ

What is the isolation rating and safety certification status of SI8660BC-AS1R?

The SI8660BC-AS1R has a 3.75 kVRMS reinforced isolation rating and is certified to UL 1577 (5000 VRMS/1 min), VDE 0884-10, IEC 62368-1, IEC 60601-1, and GB4943.1. These approvals validate its suitability for medical, industrial, and automotive end-equipment requiring reinforced insulation barriers.

Does SI8660BC-AS1R require external startup initialization or configuration?

No. The SI8660BC-AS1R is a CMOS-based RF digital isolator with zero-startup overhead-it begins passing data within 40 µs of VDD1/VDD2 reaching UVLO thresholds and requires no firmware, registers, or external clocks. This simplifies integration into safety-critical systems where deterministic behavior is mandatory.

What does the "C" in SI8660BC-AS1R indicate about its fail-safe behavior?

The "C" suffix denotes low-default fail-safe mode: when VDD1 is unpowered but VDD2 remains active, all six outputs (OUTA–OUTF) are held low. This is confirmed in Table 1.1 of the datasheet and ensures safe deactivation of downstream drivers or protection circuitry during input-side power loss.

Can SI8660BC-AS1R operate with mixed supply voltages (e.g., 3.3 V on VDD1 and 5 V on VDD2)?

Yes. The SI8660BC-AS1R supports independent 2.5–5.5 V supplies on each side. It tolerates VDD1 = 3.3 V and VDD2 = 5 V simultaneously, enabling seamless interfacing between 3.3 V MCUs and 5 V analog or power stages without external level-shifting circuitry.

Is SI8660BC-AS1R pin-compatible with other Si866x variants in the same SOIC-16 narrow-body package?

Yes-SI8660BC-AS1R shares identical pinout and footprint with all Si866x devices in NB SOIC-16 (e.g., SI8660BB-AS1, SI8660EC-AS1). Channel count, fail-safe state, and isolation rating vary by part number, but mechanical and electrical pin assignments are fully compatible for drop-in replacement within the same configuration group.