Skyworks Solutions Inc. SI8450AA-A-IS1

Overview

SI8450AA-A-IS1 from Skyworks Solutions is a five-channel, ultra-low-power digital isolator in a 16-pin narrow-body SOIC package, supporting up to 150 Mbps data rate with <9.5 ns worst-case propagation delay, 25 kV/µs CMTI, and 2.5 kV_RMS isolation voltage. It operates across 2.70–5.5 V supply rails and delivers <6 mA per channel at 100 Mbps (5 V), enabling high-speed signal isolation in motor control and isolated power supplies.

For engineers reviewing the SI8450AA-A-IS1 datasheet, SI8450AA-A-IS1 pinout, SI8450AA-A-IS1 application, or SI8450AA-A-IS1 equivalent, this page provides verified technical context, real-world timing behavior, safety-certified isolation specs, and validated alternative options for industrial and automotive subsystem design.

Technical Context

The SI8450AA-A-IS1 implements capacitive isolation with on-chip RF modulation/demodulation circuitry, delivering deterministic timing performance across –40°C to +125°C at 150 Mbps. Its dual-supply architecture (VDD1/VDD2) enables galvanic separation between input and output domains while maintaining independent 2.70–5.5 V operation on each side.

It features an enable-controlled output stage with 5–8 ns enable-to-data-valid latency and supports DC-to-150 Mbps data transmission without start-up initialization. The device achieves 0.5 ns typical channel-to-channel skew and 6 ns minimum pulse width, meeting stringent timing requirements in isolated ADC interfaces and gate driver feedback loops.

Key Specifications

Pinout & Package

SI8450AA-A-IS1 is housed in a 16-pin narrow-body SOIC (SOIC-16 NB) package with 1.27 mm pitch, 10.3 mm × 6.4 mm footprint, and 2.35 mm max height. Pin 1 is marked with a dot; pins 1–8 form the primary-side interface, pins 9–16 the secondary-side interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM141D1BRZ and ISO6751QDR, SI8450AA-A-IS1 uniquely balances five-channel count, 150 Mbps speed, ultra-low power, and integrated enable functionality in a single SOIC-16 package-making it optimal for space-constrained industrial controllers needing high-speed, low-latency isolation without external logic.

Availability

SI8450AA-A-IS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, and hybrid electric vehicle battery management systems requiring stable component supply and long-term lifecycle support.

Supply support for SI8450AA-A-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, with leadership in RF, timing, and isolation technologies.

The Si84xx family was designed for high-reliability industrial and automotive isolation applications demanding low power, precise timing, and regulatory-compliant 2.5 kV_RMS reinforcement - targeting motor drives, power conversion, and battery monitoring systems.

FAQ

What is the maximum operating temperature for SI8450AA-A-IS1 at full 150 Mbps data rate?

The SI8450AA-A-IS1 is rated for continuous operation at –40°C to +125°C ambient temperature when running at 150 Mbps with 15 pF load and 5 V supply. This specification is validated per Table 1 in the datasheet and applies to both VDD1 and VDD2 domains independently, making SI8450AA-A-IS1 suitable for under-hood automotive and high-temperature industrial environments.

Does SI8450AA-A-IS1 require external pull-up or pull-down resistors on its input pins?

No, SI8450AA-A-IS1 does not require external pull-up or pull-down resistors on IN1–IN5. Its CMOS inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds with ±10 µA leakage, allowing direct interfacing with microcontroller GPIOs or logic gates. This simplifies layout and reduces BOM count compared to optocouplers or older isolators.

How does the enable (EN) pin function in SI8450AA-A-IS1?

The EN pin on SI8450AA-A-IS1 is an active-high control that places all five outputs (OUT1–OUT5) into high-impedance state when driven low. Enable-to-data-valid latency is 5–8 ns, and enable-to-tri-state is 7–9.2 ns. This feature allows dynamic bus sharing, safe power sequencing, and low-power sleep modes - critical in modular PLC backplanes and reconfigurable power systems using SI8450AA-A-IS1.

Is SI8450AA-A-IS1 certified for reinforced insulation in safety-critical systems?

Yes, SI8450AA-A-IS1 is certified for reinforced insulation per UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. It achieves 4.9 mm clearance and 4.01 mm creepage in its SOIC-16 NB package and is production-tested to 3000 V_RMS for 1 second - satisfying requirements for functional safety architectures up to SIL 3 in motor control and power conversion.

What is the output impedance of SI8450AA-A-IS1 and why does it matter?

SI8450AA-A-IS1 has a nominal output impedance of 85 Ω ±40%, formed by on-chip series termination and driver FET resistance. This value is optimized for driving controlled-impedance PCB traces (e.g., 50–100 Ω) directly, minimizing reflections and signal integrity loss at 150 Mbps. Matching trace impedance avoids external termination components, reducing layout complexity and cost in high-speed isolated interfaces using SI8450AA-A-IS1.