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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8455BB-B-IS1R

Name: SI8455BB-B-IS1R
Brand: Skyworks Solutions Inc.
SKU: SI8455BB-B-IS1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8455BB-B-IS1R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SI8455BB-B-IS1R.pdf

Description:: DGTL ISO 2500VRMS 5CH GP 16SOIC

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Product details

Overview

SI8455BB-B-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, <9.5 ns worst-case propagation delay, 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 ADC interfaces.

For engineers reviewing the SI8455BB-B-IS1R datasheet, SI8455BB-B-IS1R pinout, SI8455BB-B-IS1R application, or SI8455BB-B-IS1R equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), channel-channel skew (≤1.8 ns), CMTI (25 kV/µs), and real-world design meaning for industrial and automotive isolation use cases.

Technical Context

The SI8455BB-B-IS1R implements capacitive digital isolation with on-chip RF modulation/demodulation, delivering precise timing stability across –40°C to +125°C at full 150 Mbps. Its dual-supply architecture (VDD1/VDD2) supports asymmetric rail operation (e.g., 3.3 V on one side, 5 V on the other) without level-shifting circuitry.

Each of its five isolated channels features independent enable control, sub-10 ns propagation delay matching, and 0.5 ns typical channel-to-channel skew. The device requires only VDD bypass capacitors-no external transformers, optocoupler biasing, or initialization sequence-reducing BOM count and startup latency (t_SU ≤ 40 µs).

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - enables real-time feedback in servo drives and high-resolution isolated ADC sampling.
Propagation Delay	3.0–9.5 ns (typ/max) - ensures deterministic timing in closed-loop motor control and power converter gate drive synchronization.
Channel-Channel Skew	≤1.8 ns (max) - maintains phase alignment across multi-channel isolated sensor interfaces (e.g., three-phase current sensing).
Isolation Voltage	2500 V_RMS (1 min) - meets reinforced insulation requirements for industrial PLC I/O modules and EV battery management systems.
CMTI	25 kV/µs - suppresses noise-induced glitches in high-dV/dt environments like SiC/GaN inverter switching nodes.
Supply Range	2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
Power @ 100 Mbps	<6 mA per channel (5 V) - reduces thermal load in densely packed isolated power supplies and multi-isolator PCB layouts.

Pinout & Package

SI8455BB-B-IS1R is housed in a RoHS-compliant 16-pin narrow-body SOIC (SOIC-16 NB) package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and 2.35 mm max height. Pin 1 marked with dot; pins 1–8 form primary-side interface, pins 9–16 secondary-side.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side supply	Power for input-side logic and channel transmitters; supports 2.70–5.5 V with bypass capacitor required.
GND1	Primary-side ground	Reference for all primary-side signals; must be separated from secondary ground by isolation barrier.
IN1–IN5	Primary-side digital inputs	CMOS-compatible inputs accepting 0.8 V / 2.0 V thresholds; no pull-ups needed for standard logic drivers.
EN1–EN5	Per-channel enable inputs	Active-high enables; outputs go low when disabled-enables dynamic channel gating in low-power modes.
VDD2	Secondary-side supply	Independent supply for output-side logic; may differ from VDD1 (e.g., 3.3 V vs. 5 V) without external level translation.
GND2	Secondary-side ground	Reference for all secondary-side outputs; galvanically isolated from GND1 per safety certification.
OUT1–OUT5	Secondary-side digital outputs	Push-pull CMOS outputs with 85 Ω nominal impedance; compatible with controlled-impedance PCB routing for >50 Mbps signals.

Key Features

Feature	Design Value
No start-up initialization	Valid output within 40 µs of power application-eliminates boot-time delays in safety-critical power-on sequencing.
Ultra-low-power operation	<1.6 mA per channel at 1 Mbps (5 V)-extends battery life in portable isolated test equipment and IoT edge sensors.
Precise timing control	1.5 ns pulse width distortion and 2 ns propagation delay skew-preserves signal integrity in high-fidelity isolated data acquisition.
High electromagnetic immunity	25 kV/µs common-mode transient immunity-ensures reliable operation near high-current switching nodes in inverters and SMPS.
Safety-certified isolation	UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2 certified for 2500 V_RMS-meets reinforced insulation requirements for industrial and automotive end-equipment.

Applications

Industrial Motor Control	Isolated ADC Interface
Use Scenario: Isolating encoder feedback and PWM gate signals in 3-phase BLDC drives operating at 20 kHz switching frequency. IC Role / Device Role / Timing Role: Five-channel isolator transmitting position data (IN1–IN3), enable commands (IN4), and fault status (IN5) across isolation barrier with ≤1.8 ns inter-channel skew. Use Value: Enables synchronous sampling of three-phase currents with matched propagation delay, reducing torque ripple in field-oriented control algorithms.	Use Scenario: Interfacing a 16-bit sigma-delta ADC (e.g., AD7768) to an isolated SPI host in high-voltage energy metering. IC Role / Device Role / Timing Role: Transmitting SCLK, MOSI, MISO, CS, and DRDY signals across isolation barrier while maintaining 150 Mbps timing margin for oversampled data streams. Use Value: Eliminates need for discrete level shifters and optocouplers, reducing layout area and jitter accumulation in metrology-grade sampling clocks.
Hybrid Electric Vehicle Inverter	Isolated Switch-Mode Power Supply
Use Scenario: Isolating gate driver signals and fault reporting between MCU and SiC half-bridge modules in 800 V traction inverters. IC Role / Device Role / Timing Role: Delivering matched-delay PWM signals (IN1–IN4) and DESAT response (IN5) with 25 kV/µs CMTI immunity against fast dV/dt transients. Use Value: Prevents false triggering during 50 V/ns switching events, improving system reliability and reducing overvoltage stress on power devices.	Use Scenario: Providing feedback isolation for voltage and current sensing in 1 kW LLC resonant converters with primary-side regulation. IC Role / Device Role / Timing Role: Isolating error amplifier output, current sense comparator latch, and soft-start control signals between primary and secondary control domains. Use Value: Enables single-chip controller placement on secondary side while maintaining fast transient response (<10 ns delay) for tight output regulation.

Industrial Motor Control

Isolated ADC Interface

Use Scenario: Isolating encoder feedback and PWM gate signals in 3-phase BLDC drives operating at 20 kHz switching frequency.

IC Role / Device Role / Timing Role: Five-channel isolator transmitting position data (IN1–IN3), enable commands (IN4), and fault status (IN5) across isolation barrier with ≤1.8 ns inter-channel skew.

Use Value: Enables synchronous sampling of three-phase currents with matched propagation delay, reducing torque ripple in field-oriented control algorithms.

Use Scenario: Interfacing a 16-bit sigma-delta ADC (e.g., AD7768) to an isolated SPI host in high-voltage energy metering.

IC Role / Device Role / Timing Role: Transmitting SCLK, MOSI, MISO, CS, and DRDY signals across isolation barrier while maintaining 150 Mbps timing margin for oversampled data streams.

Use Value: Eliminates need for discrete level shifters and optocouplers, reducing layout area and jitter accumulation in metrology-grade sampling clocks.

Hybrid Electric Vehicle Inverter

Isolated Switch-Mode Power Supply

Use Scenario: Isolating gate driver signals and fault reporting between MCU and SiC half-bridge modules in 800 V traction inverters.

IC Role / Device Role / Timing Role: Delivering matched-delay PWM signals (IN1–IN4) and DESAT response (IN5) with 25 kV/µs CMTI immunity against fast dV/dt transients.

Use Value: Prevents false triggering during 50 V/ns switching events, improving system reliability and reducing overvoltage stress on power devices.

Use Scenario: Providing feedback isolation for voltage and current sensing in 1 kW LLC resonant converters with primary-side regulation.

IC Role / Device Role / Timing Role: Isolating error amplifier output, current sense comparator latch, and soft-start control signals between primary and secondary control domains.

Use Value: Enables single-chip controller placement on secondary side while maintaining fast transient response (<10 ns delay) for tight output regulation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM141D0BRZ	Four-channel, 150 Mbps, 2.5 kV_RMS, SOIC-16; lacks per-channel enable and has higher 10.5 ns max propagation delay.	Not suitable for five-signal isolation without stacking; less optimal for dynamic channel gating in low-power sleep modes.	Select when four channels suffice and legacy ADI ecosystem integration is prioritized over per-channel control.
ISO6751QDR	Five-channel, 50 Mbps, 5 kV_RMS, SOIC-16; lower speed but higher isolation rating and integrated LDO on secondary side.	Better suited for high-isolation medical or grid-tie applications where speed <50 Mbps is acceptable and local regulation is needed.	Select when 5 kV_RMS working voltage or secondary-side power regulation outweighs 150 Mbps bandwidth requirement.

Compared with ADUM141D0BRZ and ISO6751QDR, SI8455BB-B-IS1R uniquely balances five-channel count, 150 Mbps speed, per-channel enable, and 2.5 kV_RMS certification in a standard SOIC-16-making it optimal for space-constrained, high-speed industrial motion control where channel granularity and timing precision are critical.

Availability

SI8455BB-B-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle inverters, and isolated switch-mode power supplies requiring stable component supply, long-lifecycle support, and compliance with UL/CSA/VDE safety standards.

Supply support for SI8455BB-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 for wireless, automotive, and industrial markets.

The Si84xx family was designed specifically for high-reliability, low-power digital signal isolation in harsh environments-targeting applications demanding precise timing, high CMTI, and regulatory-compliant galvanic separation without optical or magnetic limitations.

FAQ

What is the maximum data rate supported by SI8455BB-B-IS1R?

The SI8455BB-B-IS1R supports a maximum data rate of 150 Mbps under specified conditions (VDD = 5 V, TA = –40°C to +125°C, CL = 15 pF). This performance is guaranteed across temperature and voltage ranges, enabling use in high-speed serial interfaces such as isolated SPI clock lines and real-time encoder data links. SI8455BB-B-IS1R achieves this without external components or configuration registers.

Does SI8455BB-B-IS1R require external components for operation?

No, SI8455BB-B-IS1R requires only VDD bypass capacitors-no external transformers, optocoupler bias resistors, or initialization firmware. Its capacitive isolation architecture eliminates start-up delays, and the device begins passing valid data within 40 µs of power application. SI8455BB-B-IS1R integrates all necessary circuitry for signal transmission, including on-chip termination and enable logic.

What safety certifications apply to SI8455BB-B-IS1R?

SI8455BB-B-IS1R is certified to UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 V_PEAK working voltage). These certifications cover reinforced insulation for industrial and automotive applications. All units undergo 100% production testing at 3000 V_RMS for 1 second, confirming SI8455BB-B-IS1R's compliance before shipment.

How does the per-channel enable feature function in SI8455BB-B-IS1R?

Each of the five channels in SI8455BB-B-IS1R has a dedicated active-high enable input (EN1–EN5). When an enable pin is low, its corresponding output (OUTx) is driven low-not high-impedance-ensuring fail-safe behavior in fault conditions. This allows dynamic channel gating during low-power states without external logic, and SI8455BB-B-IS1R maintains full timing specifications when individual channels are enabled or disabled.

What is the channel-to-channel skew specification for SI8455BB-B-IS1R?

SI8455BB-B-IS1R specifies a maximum channel-to-channel skew of 1.8 ns (typical 0.5 ns) across all five channels under 5 V operation and full temperature range. This tight skew enables synchronized sampling of multi-sensor data (e.g., three-phase current/voltage) and precise timing alignment in multi-axis motion controllers. SI8455BB-B-IS1R achieves this via matched internal RC paths and differential RF modulation architecture.

SI8455BB-B-IS1R Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 5

Inputs - Side 1/Side 2:: 5/0

Channel Type:: Unidirectional

Voltage - Isolation:: 2500Vrms

Common Mode Transient Immunity (Min):: 25kV/µs (Typ)

Data Rate:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 9.5ns, 9.5ns

Pulse Width Distortion (Max):: 2.5ns

Rise / Fall Time (Typ):: 3.8ns, 2.8ns

Voltage - Supply:: 2.7V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SI8455BB-B-IS1R FAQ

1.How can I place an order for SI8455BB-B-IS1R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8455BB-B-IS1R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SI8455BB-B-IS1R reliable?

The price and inventory of SI8455BB-B-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8455BB-B-IS1R is usually 5 days.

3.What payment methods are accepted for SI8455BB-B-IS1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BB-B-IS1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8455BB-B-IS1R?

SI8455BB-B-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8455BB-B-IS1R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SI8455BB-B-IS1R?

For technical support, including SI8455BB-B-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BB-B-IS1R requirements.

6.How does Aetrix verify that SI8455BB-B-IS1R is sourced from the original manufacturer or authorized distributors?

All SI8455BB-B-IS1R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI8455BB-B-IS1R meets industry standards.

7.What is the process for return or replacement of SI8455BB-B-IS1R?

All SI8455BB-B-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BB-B-IS1R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SI8455BB-B-IS1R part is unused and in its original packaging.

Return procedure for SI8455BB-B-IS1R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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