Skyworks Solutions Inc. SI8655BD-ASR

Overview

SI8655BD-ASR from Skyworks is a five-channel, unidirectional digital isolator with 5 kVRMS reinforced insulation, Schmitt-trigger inputs, and fail-safe low-default output state. It operates from 2.5–5.5 V on both sides, supports DC to 150 Mbps data rates, achieves <10 ns propagation delay, and targets high-reliability industrial and automotive isolation interfaces such as battery management systems and traction inverters.

For engineers reviewing the SI8655BD-ASR datasheet, SI8655BD-ASR pinout, SI8655BD-ASR application, or SI8655BD-ASR equivalent, this page delivers verified specifications, package mapping, functional context, and real-world use cases - all confirmed for the exact SI8655BD-ASR variant including its wide-body SOIC-16 packaging, automotive-grade qualification (AEC-Q100), and 5.0 kVRMS isolation rating.

Technical Context

The SI8655BD-ASR implements RF-based on-off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture provides five input-to-output channels (5:0 configuration), with no enable pins - outputs are always active and follow input states directly.

All five channels share identical timing performance: typical 8 ns propagation delay, ≤0.5 ns channel-to-channel skew, and ≤2 ns propagation delay skew. The device features integrated undervoltage lockout (UVLO) on both sides, Schmitt-trigger inputs (0.44 V hysteresis), and failsafe operation where outputs default to logic low during input-side power loss.

Key Specifications

Pinout & Package

SI8655BD-ASR uses a 16-pin wide-body SOIC package (WB SOIC-16) with 7.5 mm creepage/clearance, supporting reinforced insulation up to 5 kVRMS. Pin spacing meets IEC 60664-1 requirements for functional and safety isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8655BA-ASR and ADUM141E0BRZ, SI8655BD-ASR uniquely combines 5-channel count, 5.0 kVRMS reinforced insulation, AEC-Q100 Grade 0 qualification, and sub-10 ns timing - making it the only drop-in solution for safety-critical automotive and industrial isolation requiring full regulatory compliance and high-speed determinism.

Availability

SI8655BD-ASR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.

Supply support for SI8655BD-ASR 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 high-performance wireless and power systems.

The SI865x family was designed specifically for replacing optocouplers in demanding industrial and automotive applications - delivering superior speed, reliability, and integration while meeting stringent safety certifications (UL, VDE, CQC) and AEC-Q100 requirements.

FAQ

What is the isolation rating and certification status of SI8655BD-ASR?

SI8655BD-ASR provides 5.0 kVRMS reinforced insulation and is certified by UL (1577), VDE (0884-10), CSA, and CQC to IEC 62368-1 and IEC 60601-1 standards. These approvals validate its use in safety-critical applications such as electric vehicle battery management and medical power supplies where galvanic separation must withstand sustained high voltage and transient surges.

Does SI8655BD-ASR require external enable signals or startup configuration?

No. SI8655BD-ASR has no enable pins and requires no initialization sequence. Outputs become valid within 40 µs after VDD1 and VDD2 reach operating voltage. Its 5-channel architecture is fixed as input-only on Side A (A1–A5) and output-only on Side B (B1–B5), simplifying system design and eliminating firmware dependencies for isolation readiness.

What is the default output behavior of SI8655BD-ASR during input-side power loss?

SI8655BD-ASR is ordered with the "BD" suffix to guarantee fail-safe low-default output behavior. When VDD1 is unpowered but VDD2 remains active, all five outputs (B1–B5) drive logic low - a critical safety feature for disabling gate drivers or de-energizing actuators in BMS and industrial control systems.

Can SI8655BD-ASR operate with mixed supply voltages, such as 3.3 V on Side A and 5 V on Side B?

Yes. SI8655BD-ASR supports independent 2.5–5.5 V supplies on both sides. It reliably translates 3.3 V logic inputs (A1–A5) to 5 V CMOS outputs (B1–B5), eliminating external level shifters. Input thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) ensure noise-immune detection across the full supply range.

How does SI8655BD-ASR compare to optocouplers in terms of timing performance and reliability?

SI8655BD-ASR delivers 5–13 ns propagation delay (vs. 50–200 ns for optocouplers), <0.5 ns channel-to-channel skew, and zero LED aging or temperature drift. Its RF-based isolation achieves 60-year lifetime at rated voltage, whereas optocoupler CTR degrades over time - making SI8655BD-ASR ideal for mission-critical, long-lifecycle applications like EV powertrains.