Skyworks Solutions Inc. SI8422BD-D-ISR

Overview

SI8422BD-D-ISR from Skyworks is a dual-channel, unidirectional digital isolator with 150 Mbps data rate, 2.5 kV_RMS isolation rating, and selectable high-default fail-safe output mode. It operates across 2.7–5.5 V supply rails on both sides, features Schmitt-trigger inputs for noise immunity, and targets isolated communication in industrial motor control and power inverters.

For engineers reviewing the SI8422BD-D-ISR datasheet, SI8422BD-D-ISR pinout, SI8422BD-D-ISR application, or SI8422BD-D-ISR equivalent, key selection criteria include propagation delay skew (≤3 ns), channel-to-channel skew (≤1.5 ns), CMTI (≥45 kV/µs), ultra-low power at 100 Mbps (<6.8 mA/channel @ 5 V), and SOIC-16 wide-body package compatibility with reinforced insulation requirements.

Technical Context

The SI8422BD-D-ISR implements RF-based on-off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical or magnetic coupling. Its dual-channel architecture supports independent input-to-output signal transmission with precise timing alignment.

Each channel integrates an RF oscillator, modulator, demodulator, and output driver, with UVLO monitoring on both VDD1 and VDD2 sides. The device maintains stable propagation delay (4–11 ns) and pulse width distortion (≤3 ns) across –40 to +125 °C at full 150 Mbps data rate.

Key Specifications

Pinout & Package

SI8422BD-D-ISR uses a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.65 mm height) supporting reinforced insulation up to 5 kV_RMS. Creepage and clearance meet IEC 60664-1 requirements for 2.5 kV_RMS working voltage.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM120N1BRZ-RL7 and ISO6721DR, SI8422BD-D-ISR delivers superior timing precision (≤1.5 ns skew vs. ≥3 ns), higher CMTI (45 vs. ≤25 kV/µs), and AEC-Q100 Grade 1 qualification - making it optimal for automotive traction inverters and high-fidelity motor control where synchronization and reliability are critical.

Availability

SI8422BD-D-ISR is available at Aetrix Electronics and suitable for industrial motor control, medical power supplies, and hybrid electric vehicle battery management systems requiring stable component supply, long-term lifecycle support, and certified 2.5 kV_RMS isolation performance.

Supply support for SI8422BD-D-ISR 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 provider of analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.

The Si84xx family was designed specifically for replacing optocouplers in industrial, automotive, and medical systems - delivering higher speed, lower power, and guaranteed lifetime performance without LED degradation.

FAQ

What is the isolation rating and safety certification status of the SI8422BD-D-ISR?

The SI8422BD-D-ISR is rated for 2.5 kV_RMS isolation and certified to UL 1577 (5000 V_RMS/1 min), CSA Component Notice 5A, and VDE IEC 60747-5-5. It supports reinforced insulation per IEC 61010-1 and IEC 60601-1 when used in SOIC-16 wide-body layout configurations meeting creepage/clearance requirements. These certifications apply directly to the SI8422BD-D-ISR part number.

Does the SI8422BD-D-ISR require external bypass capacitors, and if so, what values are recommended?

Yes, the SI8422BD-D-ISR requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2 - placed as close as possible to the respective pins. For enhanced noise immunity in high-noise environments, Skyworks recommends adding 1 µF bulk capacitors and 100 Ω series resistors on input/output lines. These values are specified in the official SI8422BD-D-ISR datasheet Section 4.3.1.

What is the default output behavior of the SI8422BD-D-ISR during input-side power loss?

The SI8422BD-D-ISR features a selectable fail-safe mode, and the "BD" suffix in SI8422BD-D-ISR indicates a default-high output configuration. When VDD1 is unpowered but VDD2 remains active, outputs OUT1 and OUT2 hold high until VDD1 is restored. This behavior is defined in Table 4.1 of the SI8422BD-D-ISR datasheet and enables safe shutdown sequencing in motor control systems.

Can the SI8422BD-D-ISR operate reliably at 150 Mbps across the full temperature range?

Yes, the SI8422BD-D-ISR guarantees 150 Mbps operation from –40 to +125 °C, as confirmed in Table 2.1 (Ordering Guide) and Table 5.2 (Electrical Characteristics). Propagation delay remains ≤11 ns and channel-channel skew ≤1.5 ns across this range, with supply current <6.8 mA/channel at 100 Mbps and 5 V - all verified under worst-case conditions per the SI8422BD-D-ISR datasheet.

Is the SI8422BD-D-ISR pin-compatible with other devices in the Si84xx family, such as the SI8422AD-D-ISR?

No, SI8422BD-D-ISR is not pin-compatible with SI8422AD-D-ISR. While both share the same SOIC-16 wide-body package and pinout, they differ in fail-safe default state: SI8422BD-D-ISR is default-high, whereas SI8422AD-D-ISR is default-low. Swapping them without firmware or logic redesign risks incorrect system behavior during power transitions - a distinction explicitly documented in Skyworks' SI8422BD-D-ISR ordering guide.