Skyworks Solutions Inc. SI8461BB-B-IS1R

Overview

SI8461BB-B-IS1R 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 side at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated power supplies.

For engineers reviewing the SI8461BB-B-IS1R datasheet, SI8461BB-B-IS1R pinout, SI8461BB-B-IS1R application, or SI8461BB-B-IS1R equivalent, key selection criteria include its 150 Mbps capability, 2.5 kVRMS reinforced insulation rating (UL/CSA/VDE certified), 6-channel unidirectional configuration (B variant), and operation over –40 to +125 °C at full speed - critical for industrial inverters and HEV battery management systems.

Technical Context

The SI8461BB-B-IS1R implements capacitive isolation using differential RF signaling across six independent channels, with all inputs and outputs referenced to separate VDD1 and VDD2 domains. Its architecture eliminates start-up initialization and supports DC-to-150 Mbps signal transmission without duty-cycle dependency.

It features precise timing performance: typical pulse width distortion of 1.5 ns, propagation delay skew ≤3.0 ns (P-P), and minimum pulse width of 6.0 ns at 5 V. The device achieves 2500 VRMS withstand voltage per UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2 standards, with internal clearance ≥0.008 mm and creepage ≥3.9 mm.

Key Specifications

Pinout & Package

SI8461BB-B-IS1R is housed in a RoHS-compliant 16-pin narrow-body SOIC package (5.3 mm width, 10.3 mm length), with creepage and clearance ≥3.9 mm and internal isolation barrier rated to 3600 VRMS (1 s).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM161NBRZ and ISO6761DR, the SI8461BB-B-IS1R delivers superior timing precision (0.5 ns skew vs. ≥2 ns), lowest dynamic power at 100+ Mbps, and optimal balance of speed, isolation, and temperature range for industrial motor control and HEV subsystems.

Availability

SI8461BB-B-IS1R is available at Aetrix Electronics and suitable for industrial motor drives, hybrid electric vehicle battery management, and isolated switch-mode power supplies requiring stable component supply, long-lifecycle assurance, and compliance with UL, CSA, and VDE safety standards.

Supply support for SI8461BB-B-IS1R 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 Si846x family was designed specifically for high-reliability, high-speed digital isolation in industrial automation, automotive electrification, and energy infrastructure - emphasizing low power, precise timing, and robust safety certification.

FAQ

What is the maximum data rate supported by the SI8461BB-B-IS1R?

The SI8461BB-B-IS1R supports a maximum data rate of 150 Mbps under standard operating conditions (VDD = 5 V, TA = –40 to +125 °C). This is confirmed in Table 3 and Table 4 of the Skyworks datasheet Rev. 1.6 for the Si846xBx variant, which includes SI8461BB-B-IS1R. At lower supply voltages (e.g., 2.7 V), the guaranteed maximum remains 150 Mbps, though timing margins may tighten.

Does the SI8461BB-B-IS1R require external components for basic operation?

No, the SI8461BB-B-IS1R requires only VDD bypass capacitors (0.1 µF ceramic recommended per supply rail) for stable operation. It does not need external pull-up/down resistors, level shifters, or initialization firmware - start-up is automatic within 40 µs of power application, as specified in the "Start-up Time" parameter (tSU = 15–40 µs).

What safety certifications apply to the SI8461BB-B-IS1R?

The SI8461BB-B-IS1R is certified to UL 1577 (2500 VRMS, File E257455), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (File 5006301-4880-0001). These cover reinforced insulation up to 2500 VRMS for 1 minute, with production testing to 3000 VRMS for 1 second per regulatory note in Table 6.

How many isolation channels does the SI8461BB-B-IS1R provide, and what is their directionality?

The SI8461BB-B-IS1R provides six unidirectional isolation channels (IN1→OUT1 through IN6→OUT6), as indicated by the "B" suffix in the part number per Skyworks' Si846x ordering guide. It is not configurable for bidirectional operation or channel reassignment - each channel is fixed input-to-output, making it ideal for asymmetric control-to-power signal routing.

What is the operating temperature range for full-speed operation of the SI8461BB-B-IS1R?

The SI8461BB-B-IS1R operates at full 150 Mbps data rate across –40 to +125 °C ambient temperature, as explicitly stated in Table 1 ("Recommended Operating Conditions") and confirmed in the "Features" section of the datasheet. Performance parameters including propagation delay, skew, and supply current are characterized across this full range under 5 V and 3.3 V supply conditions.