Skyworks Solutions Inc. SI8461AB-B-IS1

Overview

SI8461AB-B-IS1 from Skyworks Solutions is a six-channel, ultra-low-power digital isolator in a 16-pin narrow-body SOIC package, supporting up to 150 Mbps data rate with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <9.0 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated power supplies.

For engineers reviewing the SI8461AB-B-IS1 datasheet, SI8461AB-B-IS1 pinout, SI8461AB-B-IS1 application, or SI8461AB-B-IS1 equivalent, key selection criteria include its 150 Mbps capability, 2500 VRMS reinforced insulation rating, 6-channel unidirectional configuration (3+3), and compatibility with industrial-temperature (–40°C to +125°C) operation at full speed.

Technical Context

The SI8461AB-B-IS1 implements capacitive isolation using on-chip RF modulation/demodulation across six independent channels, with three input-to-output channels on side 1 and three output-from-input channels on side 2. Its architecture eliminates start-up initialization and supports asymmetric supply operation (VDD1 ≠ VDD2).

It achieves precise timing via matched internal RC oscillators and differential edge detection, delivering 1.5 ns typical pulse width distortion and 2 ns propagation delay skew across temperature and voltage. Safety compliance includes UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (reinforced insulation).

Key Specifications

Pinout & Package

SI8461AB-B-IS1 is housed in a RoHS-compliant 16-pin narrow-body SOIC package (7.5 mm × 10.3 mm, 1.27 mm pitch) with creepage/clearance ≥3.9 mm and internal clearance ≥0.008 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6403ARWZ and ISO6763DWR, SI8461AB-B-IS1 uniquely combines six-channel 150 Mbps operation, 0.5 ns channel skew, and 25 kV/µs CMTI in a narrow-body SOIC-making it optimal for high-fidelity timing-critical isolation where speed, precision, and package footprint are jointly constrained.

Availability

SI8461AB-B-IS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply feedback, and hybrid electric vehicle battery management requiring stable component supply and long-term lifecycle assurance.

Supply support for SI8461AB-B-IS1 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 Si84xx family was designed specifically for high-reliability digital isolation in harsh electromagnetic environments, targeting applications demanding precision timing, low power, and regulatory-compliant reinforced insulation.

FAQ

What is the maximum data rate supported by the SI8461AB-B-IS1?

The SI8461AB-B-IS1 supports a maximum data rate of 150 Mbps under specified operating conditions (VDD = 5 V, TA = –40°C to +125°C). This is confirmed in Table 3 and Table 4 of the Skyworks datasheet Rev. 1.6 for the "Si846xBx" variant, which SI8461AB-B-IS1 belongs to based on its "B" speed grade suffix.

Does the SI8461AB-B-IS1 require external startup circuitry or initialization firmware?

No, the SI8461AB-B-IS1 requires no start-up initialization. Valid output data is guaranteed within 40 µs after power application, as specified in Table 3's "Start-up Time" parameter. This autonomous operation simplifies system design and eliminates boot-time dependencies in the SI8461AB-B-IS1 signal path.

What safety certifications apply to the SI8461AB-B-IS1?

The SI8461AB-B-IS1 is certified to UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These certifications cover reinforced insulation for working voltages up to 300 VRMS (CSA) and 560 Vpeak (VDE), as documented in Table 6 of the datasheet Rev. 1.6.

Can the SI8461AB-B-IS1 operate with different supply voltages on each side?

Yes, the SI8461AB-B-IS1 supports independent supply rails: VDD1 (2.70–5.5 V) powers side 1 (IN1–IN3, OUT1–OUT3), and VDD2 (2.70–5.5 V) powers side 2 (IN4–IN6, OUT4–OUT6). This allows interfacing between 3.3 V microcontrollers and 5 V peripherals without external level shifters, as verified in Tables 1–5.

What is the channel configuration of the SI8461AB-B-IS1?

The SI8461AB-B-IS1 provides six unidirectional channels in a 3+3 arrangement: IN1–IN3/OUT1–OUT3 form one direction (side 1), and IN4–IN6/OUT4–OUT6 form the reverse direction (side 2). This is explicitly defined in the "Functional Description" section and pinout tables of the Skyworks Si8460/61/62/63 datasheet Rev. 1.6.