Skyworks Solutions Inc. SI86SM40EE-AS2R

Overview

SI86SM40EE-AS2R from Skyworks Solutions is a four-channel, reinforced digital isolator with sleep mode control (SMb pin), 6000 VRMS isolation rating, 150 Mbps data rate, and operation across –40 to 125 °C. It features two forward and two reverse signal paths across an RF-based semiconductor isolation barrier, enabling bidirectional communication in isolated gate drivers and battery management systems.

For engineers reviewing the SI86SM40EE-AS2R datasheet, SI86SM40EE-AS2R pinout, SI86SM40EE-AS2R application, or SI86SM40EE-AS2R equivalent, key selection criteria include its AEC-Q100 qualification, 10 ns typical propagation delay, fail-safe default-low output option, and compatibility with isolated SPI, ADC, and motor control interfaces requiring high CMTI and low power during idle states.

Technical Context

The SI86SM40EE-AS2R implements RF-based on-off keying modulation across a monolithic semiconductor isolation barrier, eliminating startup initialization and supporting DC–150 Mbps data transmission. Its architecture includes dedicated SMb (sleep mode active-low) control for side-wide power gating while retaining one always-on channel for wake-up detection.

It supports independent 2.25–5.5 V supplies on both sides, features Schmitt-trigger + CMOS input thresholds for noise immunity, and delivers precise timing with 10 ns propagation delay and 3.5 ns pulse width distortion. The device meets IEC 60747-17 reinforced insulation requirements and UL 1577 (6000 VRMS/1 min).

Key Specifications

Pinout & Package

SI86SM40EE-AS2R is housed in a WB SOIC-16 package (wide-body, 10.3 mm creepage/clearance), supporting 6000 VRMS isolation. Pin functions are validated per Figure 3 and Table 1 of Skyworks datasheet 206553B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2400ARWZ and ISO7741FDWR, SI86SM40EE-AS2R delivers 6× higher data rate, 20% lower propagation delay, full AEC-Q100 Grade 0 qualification, and dedicated hardware sleep control-making it uniquely suited for next-generation EV traction inverters and high-density medical power supplies.

Availability

SI86SM40EE-AS2R is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and isolated switch-mode power supplies requiring stable component supply, long-term lifecycle support, and certified reinforced insulation.

Supply support for SI86SM40EE-AS2R 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-reliability applications.

The Si86Sxx family-including SI86SM40EE-AS2R-is engineered for automotive and industrial isolation, emphasizing AEC-Q100 compliance, 6000 VRMS reinforced insulation, and ultra-low-power sleep modes for EV and energy infrastructure systems.

FAQ

What is the isolation voltage rating of SI86SM40EE-AS2R and which safety standards does it meet?

SI86SM40EE-AS2R provides 6000 VRMS isolation for 1 minute per UL 1577, and is certified to IEC 60747-17 (reinforced), CSA 62368-1 and 60601-1, and CQC GB4943.1. These approvals validate its use in medical equipment, EV onboard chargers, and industrial inverters requiring reinforced insulation. The wide-body SOIC-16 package enables the full 6000 VRMS rating without external creepage extenders.

How does the SMb pin function in SI86SM40EE-AS2R, and what is its behavior during sleep mode?

The SMb pin on SI86SM40EE-AS2R is an active-low sleep mode enable. When pulled low, it shuts down all transmitter and receiver circuits except one dedicated RF channel that monitors SMb state-enabling wake-up on transition to high or open. In sleep mode, total current drops to 750 µA per side. No external pull-up is required, and the pin must be driven actively or left floating (not tied high) for normal operation.

Does SI86SM40EE-AS2R support fail-safe operation, and how is the default output state determined?

Yes, SI86SM40EE-AS2R supports selectable fail-safe mode. The "EE" in the part number indicates default-low output behavior: when Side A (input side) is unpowered but Side B (output side) remains powered, all B-side outputs drive low. This is critical for safety-critical shutdown in motor control and BMS applications. Default-high variants exist (e.g., "EH") but are not applicable to SI86SM40EE-AS2R.

What are the timing characteristics of SI86SM40EE-AS2R, and how do they impact high-speed control loops?

SI86SM40EE-AS2R delivers 10 ns typical propagation delay and 3.5 ns pulse width distortion, measured at 5 V supply and 25 °C. These values remain stable across –40 to 125 °C and support closed-loop bandwidths exceeding 50 MHz in isolated gate driver feedback paths. Low skew between channels ensures synchronized PWM edge delivery in multi-phase inverters.

Is SI86SM40EE-AS2R compatible with SPI interfaces, and what are its limitations compared to dedicated SPI isolators?

SI86SM40EE-AS2R is not a dedicated SPI isolator-it lacks built-in SPI protocol logic, chip select buffering, or MISO/MOSI labeling. However, its four independent bidirectional-capable channels (A1/B1–A4/B4) can implement isolated SPI by assigning A1–A3 to SCLK, CS, MOSI and B1–B3 to SCLK, CS, MISO. For full SPI protocol handling (e.g., automatic direction control), Skyworks' Si86SS41/51 or Si86SQ44 are recommended alternatives.