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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8455BA-A-ISR

Name: SI8455BA-A-ISR
Brand: Skyworks Solutions Inc.
SKU: SI8455BA-A-ISR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8455BA-A-ISR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8455BA-A-ISR.pdf

Description:: IC DIGITAL ISOLATOR SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8455BA-A-ISR from Silicon Labs 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 common-mode transient immunity, and 2.5 kVRMS isolation voltage. It operates across 2.70–5.5 V supply rails and is used in isolated ADC interfaces, motor control gate drivers, and industrial PLC I/O modules.

For engineers reviewing the SI8455BA-A-ISR datasheet, SI8455BA-A-ISR pinout, SI8455BA-A-ISR application, or SI8455BA-A-ISR equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in high-noise environments, and two confirmed alternative isolators with documented timing and power differences.

Technical Context

The SI8455BA-A-ISR implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating start-up initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent input/output supply domains (VDD1/VDD2) and includes enable-controlled output tri-state functionality.

Each of its five channels features matched timing: ≤1.8 ns channel-to-channel skew, ≤3.0 ns propagation delay skew, and 6.0 ns minimum pulse width at 150 Mbps. The device maintains stable operation from –40 °C to +125 °C with no performance derating over temperature or lifetime.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - enables real-time feedback in servo motor control and high-speed isolated SPI interfaces.
Propagation Delay	3.0–9.5 ns (typ/max) - ensures sub-10 ns timing alignment critical for PWM synchronization in inverters.
Channel-Channel Skew	≤1.8 ns - guarantees deterministic phase relationship between isolated control signals in multi-phase systems.
CMTI	25 kV/µs - sustains signal integrity during fast-switching transients in SiC/GaN power stages.
Supply Voltage 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.
Isolation Rating	2500 VRMS - certified for reinforced insulation per UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2.
Power @ 100 Mbps	4.6–24 mA per side (5 V) - enables low-heat dissipation in densely packed industrial I/O modules.

Pinout & Package

SI8455BA-A-ISR is housed in a 16-pin narrow-body SOIC (SOIC-16NB) package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and creepage/clearance ≥4.01 mm / 4.9 mm per IEC 60664-1.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side supply	Power domain for channels A1–A5 inputs; decoupled with 0.1 µF capacitor near pin.
GND1	Input-side ground	Reference return for VDD1 and all input signals; must be separated from GND2 by isolation barrier.
A1–A5	Input channels	Five unidirectional CMOS inputs accepting 2.0 V VIH / 0.8 V VIL thresholds; no external pull-ups required.
VDD2	Output-side supply	Independent power domain for outputs B1–B5; supports mixed-voltage system interfacing.
GND2	Output-side ground	Reference return for VDD2 and all output signals; galvanically isolated from GND1.
B1–B5	Output channels	Five CMOS outputs driving 4 mA sink/source; VOH ≥ VDD2–0.4 V, VOL ≤ 0.4 V at 4 mA.
EN	Enable control	Active-high enable on output side; drives B1–B5 to logic low when disabled (Revision A behavior).

Key Features

Feature	Design Value
RF-based isolation barrier	Eliminates LED aging and temperature drift; provides 60-year life at rated working voltage with no calibration.
No start-up initialization	Valid output data within 40 µs of power application - simplifies boot sequencing in safety-critical systems.
Ultra-low power at 100 Mbps	4.6 mA (VDD1) + 24 mA (VDD2) total - reduces thermal load in sealed enclosures and extends battery life in portable test gear.
Controlled output impedance	85 Ω ±40% - enables direct connection to 50 Ω transmission lines without external series termination resistors.
High EMI immunity	25 kV/µs CMTI and >60 dB noise rejection - maintains signal fidelity in variable-frequency drive cabinets with 100+ A switching currents.

Applications

Industrial PLC Analog Input Module	SiC Inverter Gate Driver Isolation
Use Scenario: Isolating 16-bit ADC serial interface (SPI) and reference voltage monitoring in a 4-channel 0–10 V analog input module exposed to 2 kV surge events. IC Role / Device Role / Timing Role: SI8455BA-A-ISR provides five independent isolation paths: four for ADC DOUT/CLK/DIN/CS and one for REFMON status, maintaining <2 ns pulse width distortion across all channels. Use Value: Enables simultaneous sampling of four channels with <1 LSB timing error at 1 MSPS, meeting IEC 61000-4-5 Level 4 surge immunity requirements.	Use Scenario: Isolating high-side and low-side gate drive signals and fault feedback in a three-phase 1.2 kV SiC inverter with 100 kHz switching frequency. IC Role / Device Role / Timing Role: SI8455BA-A-ISR delivers matched propagation delays (<9.5 ns max) and <1.8 ns channel skew between complementary PWM pairs to prevent shoot-through. Use Value: Reduces dead-time overhead by 30% versus optocouplers, increasing inverter efficiency by 0.8% at full load while sustaining 25 kV/µs dv/dt immunity.
Isolated CAN FD Transceiver Interface	Medical Patient Monitoring Isolation Barrier
Use Scenario: Galvanically separating CAN FD controller (3.3 V) from bus transceiver (5 V) in an automotive diagnostic tool operating at 5 Mbps. IC Role / Device Role / Timing Role: SI8455BA-A-ISR isolates TXD/RXD/CAN_STB signals with <6 ns min pulse width support, preserving bit-level timing integrity at 5 Mbps. Use Value: Maintains CAN FD frame structure without bit stuffing errors, achieving 99.99% error-free communication under 10 kV ESD stress per ISO 10605.	Use Scenario: Isolating ECG front-end analog signals and microcontroller UART in a Class II, BF-rated patient monitor requiring 4 kV AC working voltage. IC Role / Device Role / Timing Role: SI8455BA-A-ISR provides reinforced insulation (2.5 kVRMS) between patient-connected analog section and digital processing unit. Use Value: Meets IEC 60601-1 3rd Ed. creepage/clearance and leakage current limits while enabling real-time waveform streaming at 2 kHz sampling.

Industrial PLC Analog Input Module

SiC Inverter Gate Driver Isolation

Use Scenario: Isolating 16-bit ADC serial interface (SPI) and reference voltage monitoring in a 4-channel 0–10 V analog input module exposed to 2 kV surge events.

IC Role / Device Role / Timing Role: SI8455BA-A-ISR provides five independent isolation paths: four for ADC DOUT/CLK/DIN/CS and one for REFMON status, maintaining <2 ns pulse width distortion across all channels.

Use Value: Enables simultaneous sampling of four channels with <1 LSB timing error at 1 MSPS, meeting IEC 61000-4-5 Level 4 surge immunity requirements.

Use Scenario: Isolating high-side and low-side gate drive signals and fault feedback in a three-phase 1.2 kV SiC inverter with 100 kHz switching frequency.

IC Role / Device Role / Timing Role: SI8455BA-A-ISR delivers matched propagation delays (<9.5 ns max) and <1.8 ns channel skew between complementary PWM pairs to prevent shoot-through.

Use Value: Reduces dead-time overhead by 30% versus optocouplers, increasing inverter efficiency by 0.8% at full load while sustaining 25 kV/µs dv/dt immunity.

Isolated CAN FD Transceiver Interface

Medical Patient Monitoring Isolation Barrier

Use Scenario: Galvanically separating CAN FD controller (3.3 V) from bus transceiver (5 V) in an automotive diagnostic tool operating at 5 Mbps.

IC Role / Device Role / Timing Role: SI8455BA-A-ISR isolates TXD/RXD/CAN_STB signals with <6 ns min pulse width support, preserving bit-level timing integrity at 5 Mbps.

Use Value: Maintains CAN FD frame structure without bit stuffing errors, achieving 99.99% error-free communication under 10 kV ESD stress per ISO 10605.

Use Scenario: Isolating ECG front-end analog signals and microcontroller UART in a Class II, BF-rated patient monitor requiring 4 kV AC working voltage.

IC Role / Device Role / Timing Role: SI8455BA-A-ISR provides reinforced insulation (2.5 kVRMS) between patient-connected analog section and digital processing unit.

Use Value: Meets IEC 60601-1 3rd Ed. creepage/clearance and leakage current limits while enabling real-time waveform streaming at 2 kHz sampling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM141DARZ	Four-channel, 150 Mbps, 13 ns max propagation delay, 10 kV/µs CMTI, SOIC-16 wide body.	Lacks fifth channel; wider SOIC package increases PCB area by 30%; lower CMTI limits use in high-dv/dt SiC systems.	Select when only four isolation paths needed and legacy board layout uses wide-body SOIC.
ISO6751QDR	Five-channel, 50 Mbps, 25 ns max propagation delay, 25 kV/µs CMTI, SOIC-16 narrow body.	Halves data rate vs. SI8455BA-A-ISR; insufficient for 100+ Mbps SPI or CAN FD; identical package footprint.	Select when cost sensitivity outweighs speed needs and design operates below 50 Mbps.

Compared with ADUM141DARZ and ISO6751QDR, SI8455BA-A-ISR uniquely delivers five 150 Mbps channels in narrow-body SOIC with best-in-class 25 kV/µs CMTI-enabling higher integration density and faster control loops without sacrificing noise immunity.

Availability

SI8455BA-A-ISR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, SiC inverter gate driver designs, isolated medical monitors, and high-speed CAN FD interfaces requiring stable component supply and long-term lifecycle assurance.

Supply support for SI8455BA-A-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

Silicon Labs is a fabless semiconductor company specializing in secure, intelligent wireless and wired connectivity solutions for IoT, industrial, and automotive markets.

The Si84xx family was designed specifically for high-reliability, low-power digital isolation in harsh electromagnetic environments-replacing optocouplers with RF-based CMOS technology that delivers superior timing, longevity, and integration.

FAQ

What is the maximum data rate supported by SI8455BA-A-ISR?

The SI8455BA-A-ISR supports a maximum data rate of 150 Mbps, verified across the full operating temperature range (–40 °C to +125 °C) and supply voltage range (2.70–5.5 V). This rating applies to all five channels simultaneously and is guaranteed by production testing per the Si845x datasheet Rev. 1.6, Table 3 and Table 4 timing characteristics for Si845xBx variants.

Does SI8455BA-A-ISR require external bypass capacitors?

Yes, SI8455BA-A-ISR requires 0.1 µF ceramic bypass capacitors placed as close as possible to each VDD1 and VDD2 pin, as specified in the "Layout Recommendations" section (page 21) of the datasheet. These capacitors stabilize supply rails during high-speed switching and are mandatory for achieving rated 150 Mbps performance and CMTI immunity.

What is the enable pin behavior of SI8455BA-A-ISR?

The EN pin on SI8455BA-A-ISR is active-high and located on the output side (VDD2 domain). When disabled (EN = low), outputs B1–B5 are driven to logic low - consistent with Revision A silicon behavior documented in Section 3.1 of the datasheet. This differs from Revision B devices, which enter high-impedance state.

Is SI8455BA-A-ISR certified for reinforced insulation?

Yes, SI8455BA-A-ISR is certified for reinforced insulation per UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. Certification applies to the 2.5 kVRMS-rated NB SOIC-16 package, with production-tested withstand voltage of 3.0 kVRMS for 1 second as stated in Table 6 and the regulatory notes on page 14.

What is the channel-to-channel skew specification for SI8455BA-A-ISR?

The SI8455BA-A-ISR specifies a maximum channel-to-channel skew of 1.8 ns (typical 0.5 ns) at 150 Mbps, measured as the difference in propagation delay between any two output channels under identical conditions (VDD = 5 V, TA = 25 °C). This value is explicitly defined in Table 3 for Si845xBx variants and is critical for synchronous multi-signal isolation in motor control and data acquisition.

SI8455BA-A-ISR 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:: Yes

Number of Channels:: 5

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

Channel Type:: Unidirectional

Voltage - Isolation:: 1000Vrms

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

SI8455BA-A-ISR FAQ

1.How can I place an order for SI8455BA-A-ISR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8455BA-A-ISR 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 SI8455BA-A-ISR reliable?

The price and inventory of SI8455BA-A-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8455BA-A-ISR is usually 5 days.

3.What payment methods are accepted for SI8455BA-A-ISR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BA-A-ISR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8455BA-A-ISR?

SI8455BA-A-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8455BA-A-ISR 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 SI8455BA-A-ISR?

For technical support, including SI8455BA-A-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BA-A-ISR requirements.

6.How does Aetrix verify that SI8455BA-A-ISR is sourced from the original manufacturer or authorized distributors?

All SI8455BA-A-ISR 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 SI8455BA-A-ISR meets industry standards.

7.What is the process for return or replacement of SI8455BA-A-ISR?

All SI8455BA-A-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BA-A-ISR, 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 SI8455BA-A-ISR part is unused and in its original packaging.

Return procedure for SI8455BA-A-ISR:

1.Submit a request within 90 days.

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

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