Skyworks Solutions Inc. SI8641BT-AS2

Overview

SI8641BT-AS2 from Skyworks is a quad-channel, 3-input/1-output digital isolator with reinforced 5 kVRMS isolation (VDE 0884-10), 150 Mbps data rate, <10 ns propagation delay, and AEC-Q100 automotive qualification. It operates from 2.5–5.5 V on both sides and supports fail-safe low-default output mode for power-loss safety in battery management systems.

For engineers reviewing the SI8641BT-AS2 datasheet, SI8641BT-AS2 pinout, SI8641BT-AS2 application, or SI8641BT-AS2 equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, tri-state enable control logic, and automotive-grade isolation performance validated per UL, VDE, CSA, and CQC standards.

Technical Context

The SI8641BT-AS2 implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its architecture supports independent undervoltage lockout (UVLO) on both VDD1 and VDD2 sides, with 2.24 V rising threshold and 70 mV hysteresis.

It features two enable inputs (EN1 on Side A, EN2 on Side B) enabling independent tri-state control of its three input-side outputs (A1–A3) and one output-side channel (B1). The device uses Schmitt-trigger inputs (1.23–1.67 V thresholds) and achieves 0.5 ns channel-channel skew with 5 ns minimum pulse width.

Key Specifications

Pinout & Package

SI8641BT-AS2 is housed in a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16, -IS2 variant) with 8 mm creepage distance and reinforced insulation barrier. Pin 1 marked via laser top-side marking; land pattern matches JEDEC MS-013AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2401ARWZ and ISO7741FQDWRQ1, SI8641BT-AS2 uniquely combines 150 Mbps speed, VDE 0884-10 reinforcement, and SOIC-16 wide-body packaging - making it optimal for next-generation EV power electronics where timing margin, safety compliance, and thermal robustness are co-constrained.

Availability

SI8641BT-AS2 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverter control requiring stable component supply across automotive production lifecycles.

Supply support for SI8641BT-AS2 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 Si864x family was engineered specifically for high-reliability automotive and industrial isolation - emphasizing long-life stability, ultra-low power, and comprehensive safety certifications across voltage, temperature, and transient stress domains.

FAQ

What is the isolation rating and safety certification status of SI8641BT-AS2?

SI8641BT-AS2 provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10 (including 10 kV surge capability), UL 1577, CSA Component Notice 5A, IEC 62368-1, IEC 60601-1, and CQC GB4943.1. These certifications validate its suitability for automotive battery systems and medical equipment where double insulation is mandated.

How does the fail-safe default-low mode function in SI8641BT-AS2 during power loss?

In SI8641BT-AS2, when VDD1 is unpowered but VDD2 remains active, the B1 output defaults to logic low within 12 ns (tSD). This behavior is hard-coded by ordering option ('B' suffix) and ensures safe deactivation of downstream drivers - a critical requirement in battery disconnect circuits and OBC enable paths.

Can SI8641BT-AS2 support 150 Mbps data transmission across both supply domains?

Yes, SI8641BT-AS2 guarantees DC to 150 Mbps operation across its full temperature range (–40 °C to +125 °C) with VDD1 and VDD2 supplied at 2.5–5.5 V. Eye diagrams confirm clean signal integrity at 150 Mbps, and timing specs include 5 ns minimum pulse width and <4.5 ns pulse width distortion to sustain high-speed serial protocols.

What is the purpose of EN1 and EN2 pins on SI8641BT-AS2, and how are they used?

EN1 controls tri-state output of A1–A3 (Side A outputs); EN2 controls tri-state output of B1 (Side B output). Both are active-high, internally pulled up, and tolerate floating states. In SI8641BT-AS2, this enables independent channel gating - for example, disabling B1 during system reset while keeping A1–A3 active for diagnostics.

Does SI8641BT-AS2 require external bypass capacitors, and where should they be placed?

Yes, SI8641BT-AS2 requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2. These must be placed within 3 mm of their respective pins to suppress high-frequency noise and ensure stable UVLO operation - a requirement explicitly stated in the Skyworks datasheet Section 3.3.1.