Skyworks Solutions Inc. SI86S621HE-AS4R

Overview

SI86S621HE-AS4R from Skyworks Solutions is a dual-channel, high-speed digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, 10 ns typical propagation delay, and AEC-Q100 qualification for automotive systems. It features Schmitt-trigger inputs, selectable fail-safe output (default low), and operates across 2.25–5.5 V supply rails in –40 to +125 °C ambient.

For engineers reviewing the SI86S621HE-AS4R datasheet, SI86S621HE-AS4R pinout, SI86S621HE-AS4R application, or SI86S621HE-AS4R equivalent, this device supports critical timing-critical isolation in battery management systems, onboard chargers, and traction inverters where high CMTI (>100 kV/µs), precise channel-to-channel skew (<3 ns), and robust start-up behavior under UVLO are essential selection criteria.

Technical Context

The SI86S621HE-AS4R implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling deterministic 300 µs start-up time with internal 100 kΩ pulldown during power ramp. Its dual independent channels support asymmetric side-A/side-B supply operation (VDD1/VDD2) with separate UVLO and reset thresholds (RSTB± ~1.7 V).

It integrates input deglitch filtering (36 ns), CMOS/Schmitt thresholds, and failsafe logic that forces outputs low when VDD1 is unpowered but VDD2 remains active-enabling safe shutdown sequencing in automotive power domains. Timing performance is guaranteed across 2.5 V, 3.3 V, and 5.0 V supplies with <4.5 ns pulse width distortion and <3 ns channel-channel skew.

Key Specifications

Pinout & Package

SI86S621HE-AS4R uses an NB SOIC-8 package (3.9 mm creepage/clearance) with reinforced insulation barrier separating Side A (pins 1–4) and Side B (pins 5–8). Pin functions are electrically isolated and not interchangeable between sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM121N1BRZ-RL7 and ISO7721FDWR, the SI86S621HE-AS4R delivers higher isolation (6000 vs. 5000 VRMS), integrated 36 ns deglitching, AEC-Q100 qualification, and guaranteed ≤3 ns channel skew-making it the only option qualified for ASIL-B safety-critical automotive power systems requiring reinforced insulation and deterministic timing.

Availability

SI86S621HE-AS4R is available at Aetrix Electronics and suitable for battery management systems, onboard chargers, and traction inverters requiring stable component supply with automotive-grade traceability and long-term lifecycle support.

Supply support for SI86S621HE-AS4R 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 for wireless, automotive, and industrial markets.

The Si86S6xx family was designed specifically for high-reliability automotive and industrial isolation-delivering RF-based digital isolation with AEC-Q100 qualification, reinforced safety certification, and robust noise immunity in harsh EMI environments.

FAQ

What is the isolation voltage rating of the SI86S621HE-AS4R and which standards does it meet?

The SI86S621HE-AS4R provides 6000 VRMS isolation for 1 minute per UL 1577, reinforced insulation per VDE 60747-17 (2121 Vpeak), CSA 62368-1 (600 VRMS working voltage), and CQC GB4943.1. These certifications are validated for the NB SOIC-8 package and apply directly to the SI86S621HE-AS4R device as shipped.

Does the SI86S621HE-AS4R require external configuration or initialization at power-up?

No, the SI86S621HE-AS4R requires no external configuration or initialization. Its RF-based architecture enables deterministic 300 µs start-up time with automatic UVLO detection and internal 100 kΩ pulldown during ramp-up-ensuring predictable behavior without firmware dependencies.

What is the meaning of the "HE" and "AS4R" suffixes in SI86S621HE-AS4R?

The "HE" denotes the default-low fail-safe output option, while "AS4R" indicates tape-and-reel packaging in NB SOIC-8 with AEC-Q100 Grade 1 qualification. This exact ordering code maps to the reinforced 6000 VRMS, dual-channel, 150 Mbps variant with 36 ns input deglitching.

Can the SI86S621HE-AS4R operate with different supply voltages on Side A and Side B?

Yes, the SI86S621HE-AS4R supports independent VDD1 (2.25–5.5 V) and VDD2 (2.25–5.5 V) supplies-enabling mixed-voltage system interfacing, such as 3.3 V MCU to 5 V gate driver. Each side has its own UVLO and reset circuitry, allowing asymmetric power sequencing without latch-up.

How does the 36 ns input deglitch filter in the SI86S621HE-AS4R improve system reliability?

It blocks noise pulses shorter than 36 ns-such as those induced by switching transients in motor drives or SMPS-preventing false triggering of downstream logic. This eliminates the need for external RC filters, reduces PCB area, and maintains signal integrity without adding propagation delay to valid edges.