Skyworks Solutions Inc. SI8455BA-A-IS1R

Overview

SI8455BA-A-IS1R 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 and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <6 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.

For engineers reviewing the SI8455BA-A-IS1R datasheet, SI8455BA-A-IS1R pinout, SI8455BA-A-IS1R application, or SI8455BA-A-IS1R equivalent, key selection criteria include its 2500 VRMS reinforced insulation rating, channel-channel skew ≤1.8 ns, 6 ns minimum pulse width, and compatibility with industrial automation and hybrid electric vehicle subsystems requiring robust galvanic separation.

Technical Context

The SI8455BA-A-IS1R implements capacitive isolation with on-chip RF modulation/demodulation circuitry, eliminating magnetic or optical coupling limitations. Its five independent bidirectional channels support asymmetric voltage operation (VDD1 ≠ VDD2) and feature integrated enable inputs for output tri-state control with <9.2 ns enable-to-tri-state delay.

Designed for high-noise environments, it achieves 25 kV/µs CMTI via differential signaling and internal noise rejection, while maintaining stable timing performance over –40 to +125 °C at full 150 Mbps data rate - verified under 15 pF load and 5 V supply conditions.

Key Specifications

Pinout & Package

SI8455BA-A-IS1R 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 ≥4.01 mm / 4.9 mm and 2.0 pF input-output capacitance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM141DBRZ and ISO6751QDR, SI8455BA-A-IS1R uniquely balances five-channel count, 150 Mbps speed, 2.7 V minimum supply, and 2500 VRMS certification - making it optimal for space-constrained industrial inverters needing full-speed multi-signal isolation.

Availability

SI8455BA-A-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle battery management, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle assurance.

Supply support for SI8455BA-A-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 Si84xx family was designed specifically for high-reliability industrial and automotive isolation applications demanding low power, precise timing, and regulatory-compliant reinforced insulation - not general-purpose signal coupling.

FAQ

What is the maximum operating temperature for SI8455BA-A-IS1R at full 150 Mbps data rate?

The SI8455BA-A-IS1R maintains full 150 Mbps operation across –40 to +125 °C ambient temperature when loaded with 15 pF and powered at 5 V, as validated in Table 3 and Table 4 of the datasheet. Thermal derating begins above 125 °C case temperature per DIN EN 60747-5-2 guidelines.

Does SI8455BA-A-IS1R support independent supply voltages on each side?

Yes, SI8455BA-A-IS1R supports asymmetric operation with VDD1 and VDD2 independently set between 2.70 V and 5.5 V - enabling direct interfacing between 3.3 V microcontrollers and 5 V peripherals without external level shifters.

How many isolation channels does SI8455BA-A-IS1R provide, and what is their directionality?

SI8455BA-A-IS1R provides five unidirectional isolation channels: channels 1–5 transmit from A-side (pins 1–5) to B-side (pins 9–13). Directionality is fixed per channel; bidirectional communication requires pairing with complementary devices or external logic.

What safety certifications apply to SI8455BA-A-IS1R?

SI8455BA-A-IS1R is certified to UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 - covering reinforced insulation for industrial and automotive applications up to 560 Vpeak working voltage.

Is SI8455BA-A-IS1R recommended for new designs?

No - Skyworks explicitly marks SI8455BA-A-IS1R as "Not Recommended for New Designs" in Rev. 1.6 of the datasheet (August 2021). It remains supported for existing production, but design-in should consider newer alternatives like the Si86xx or Si88xx families for enhanced performance and longevity.