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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8445BB-D-ISR

Name: SI8445BB-D-ISR
Brand: Skyworks Solutions Inc.
SKU: SI8445BB-D-ISR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8445BB-D-ISR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: SI8445BB-D-ISR.pdf

Description:: DGTL ISO 2500VRMS 4CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8445BB-D-ISR from Skyworks Solutions is a quad-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, supporting up to 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2.5 kV_RMS isolation. 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 SI8445BB-D-ISR datasheet, SI8445BB-D-ISR pinout, SI8445BB-D-ISR application, or SI8445BB-D-ISR equivalent, this page provides verified timing specs, safety certifications (UL/CSA/VDE), channel skew (<1.8 ns), CMTI (25 kV/µs), and package-specific layout guidance for industrial and automotive-grade designs.

Technical Context

The SI8445BB-D-ISR implements capacitive isolation with on-chip RF modulation/demodulation, delivering precise timing performance: typical pulse width distortion of 1.5 ns and channel-to-channel skew as low as 0.5 ns. Its dual-supply architecture (VDD1/VDD2) enables independent 2.70–5.5 V operation on each side, supporting level-shifting between disparate logic domains.

It features an active-enable input (ENx) with 5–8 ns enable-to-data-valid latency and supports tri-state output control. The device is AEC-Q100 qualified and rated for –40 °C to +125 °C ambient operation at full 150 Mbps data rate, with 60-year lifetime at rated working voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-speed serial interfaces (e.g., SPI, RS-485 transceiver control, isolated ADC/DAC clocking).
Propagation Delay	3.0–9.5 ns (typ/max) - ensures tight timing budgets in real-time motor control and power converter feedback loops.
Channel-Channel Skew	0.5–1.8 ns (typ/max) - maintains phase alignment across four isolated channels for synchronized sampling or PWM distribution.
Common-Mode Transient Immunity	25 kV/µs - sustains reliable operation in noisy environments like inverters and industrial drives with fast-switching SiC/GaN FETs.
Isolation Voltage	2500 V_RMS (1 min) - certified for reinforced insulation per UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2.
Supply Range	2.70–5.5 V on both sides - enables interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
Power Consumption	<6 mA per channel at 100 Mbps (5 V) - reduces thermal load and extends battery life in isolated sensor nodes and portable equipment.

Pinout & Package

SI8445BB-D-ISR is housed in a 16-pin wide-body SOIC package (package outline per Skyworks Doc Rev. 1.7, Page 28), providing 8.0 mm minimum creepage/clearance for reinforced insulation compliance.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Side 1 inputs/outputs/enable	Pins 1–4: CH1–CH4 inputs (IN1–IN4); Pins 5–8: EN1–EN4 enable inputs - each channel has dedicated enable for independent gating.
9, 10, 11, 12, 13, 14, 15, 16	Side 2 outputs/inputs/ground	Pins 9–12: CH1–CH4 outputs (OUT1–OUT4); Pins 13–14: VDD2, GND2; Pins 15–16: NC - outputs are push-pull, compatible with CMOS loads.

Key Features

Feature	Design Value
No start-up initialization	Valid data appears within 40 µs of power application - eliminates boot-time delays in safety-critical systems.
Ultra-low power at high speed	<1.6 mA per channel @ 1 Mbps (5 V) - enables always-on isolation in energy-constrained IoT gateways and battery-backed controllers.
Precision timing	1.5 ns pulse width distortion and 2 ns propagation delay skew - preserves signal integrity in high-resolution encoder interfaces and time-of-flight measurements.
AEC-Q100 qualification	Grade 1 (–40 °C to +125 °C) - validated for under-hood automotive applications including EV battery management and traction inverter control.
RoHS-compliant wide-body SOIC	16-pin WB-SOIC with 8.0 mm creepage - meets IPC-7351B land pattern requirements and simplifies PCB layout for reinforced insulation.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating gate-drive signals and current-sense feedback in three-phase inverter stacks using SiC MOSFETs. IC Role / Device Role / Timing Role: Quad-channel isolator transmitting PWM signals (CH1–CH4) and enabling synchronous sampling of isolated shunt voltages. Use Value: 0.5 ns channel skew ensures matched turn-on timing across phases; 25 kV/µs CMTI prevents false triggering during 100+ V/ns switching transients.	Use Scenario: Providing primary-to-secondary communication and feedback isolation in LLC resonant converters with digital controllers. IC Role / Device Role / Timing Role: Transmitting error amplifier output and synchronous rectifier enable signals across isolation barrier with sub-10 ns latency. Use Value: 9.5 ns max propagation delay enables closed-loop bandwidth >1 MHz; 2.5 kV_RMS rating satisfies IEC 62368-1 reinforced insulation requirements.
Hybrid Electric Vehicle Battery Management	Isolated Data Acquisition System
Use Scenario: Isolating cell voltage monitoring and balancing command signals in high-voltage battery packs (up to 1000 V_DC). IC Role / Device Role / Timing Role: Four independent channels isolate individual cell monitor IC outputs and balance FET gate drivers. Use Value: AEC-Q100 Grade 1 qualification ensures reliability over 15+ year vehicle lifetime; 60-year insulation life at rated voltage supports long-term warranty commitments.	Use Scenario: Isolating SPI bus between MCU and isolated 24-bit delta-sigma ADCs in precision test equipment. IC Role / Device Role / Timing Role: Transmitting SCLK, MOSI, MISO, and CS signals across isolation barrier while maintaining timing coherence. Use Value: 150 Mbps capability supports oversampled SPI at >20 MSPS; 2.0 pF input-output capacitance minimizes noise coupling into sensitive analog front-ends.

Industrial Motor Control

Isolated Switch-Mode Power Supply

Use Scenario: Isolating gate-drive signals and current-sense feedback in three-phase inverter stacks using SiC MOSFETs.

IC Role / Device Role / Timing Role: Quad-channel isolator transmitting PWM signals (CH1–CH4) and enabling synchronous sampling of isolated shunt voltages.

Use Value: 0.5 ns channel skew ensures matched turn-on timing across phases; 25 kV/µs CMTI prevents false triggering during 100+ V/ns switching transients.

Use Scenario: Providing primary-to-secondary communication and feedback isolation in LLC resonant converters with digital controllers.

IC Role / Device Role / Timing Role: Transmitting error amplifier output and synchronous rectifier enable signals across isolation barrier with sub-10 ns latency.

Use Value: 9.5 ns max propagation delay enables closed-loop bandwidth >1 MHz; 2.5 kV_RMS rating satisfies IEC 62368-1 reinforced insulation requirements.

Hybrid Electric Vehicle Battery Management

Isolated Data Acquisition System

Use Scenario: Isolating cell voltage monitoring and balancing command signals in high-voltage battery packs (up to 1000 V_DC).

IC Role / Device Role / Timing Role: Four independent channels isolate individual cell monitor IC outputs and balance FET gate drivers.

Use Value: AEC-Q100 Grade 1 qualification ensures reliability over 15+ year vehicle lifetime; 60-year insulation life at rated voltage supports long-term warranty commitments.

Use Scenario: Isolating SPI bus between MCU and isolated 24-bit delta-sigma ADCs in precision test equipment.

IC Role / Device Role / Timing Role: Transmitting SCLK, MOSI, MISO, and CS signals across isolation barrier while maintaining timing coherence.

Use Value: 150 Mbps capability supports oversampled SPI at >20 MSPS; 2.0 pF input-output capacitance minimizes noise coupling into sensitive analog front-ends.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRWZ	Quad-channel, 150 Mbps, 3.0–5.5 V, 2.5 kV_RMS, 16-pin SOIC wide-body; propagation delay 10.5 ns (max), CMTI 75 kV/µs.	Higher CMTI suits ultra-noisy environments (e.g., rail traction); slightly higher propagation delay may limit loop bandwidth vs. SI8445BB-D-ISR.	Select when extreme noise immunity outweighs sub-ns timing precision; verify layout compatibility with ADI's recommended ground separation.
ISO6741QDWR	Quad-channel, 50 Mbps, 1.71–5.5 V, 5 kV_RMS, 16-pin SOIC wide-body; propagation delay 11 ns (max), AEC-Q100 qualified.	Higher isolation rating (5 kV_RMS) targets medical and high-voltage industrial systems; lower data rate limits use in high-speed SPI or encoder interfaces.	Choose for applications requiring >2.5 kV_RMS isolation with automotive qualification; not suitable for 100+ Mbps serial links.

Compared with ADUM140D0BRWZ and ISO6741QDWR, SI8445BB-D-ISR offers the lowest propagation delay (9.5 ns max) and best channel matching (0.5 ns skew) among wide-body SOIC quad isolators, making it optimal for timing-critical motor control and high-resolution DAQ-while ADUM140D0BRWZ trades delay for superior CMTI, and ISO6741QDWR prioritizes isolation strength over speed.

Availability

SI8445BB-D-ISR 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-lifecycle support.

Supply support for SI8445BB-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The Si84xx family was designed to replace optocouplers in high-reliability industrial, automotive, and computing applications-delivering superior speed, power efficiency, and lifetime stability through capacitive isolation architecture.

FAQ

What is the maximum operating temperature for SI8445BB-D-ISR at full 150 Mbps data rate?

The SI8445BB-D-ISR is rated for continuous operation from –40 °C to +125 °C ambient temperature at 150 Mbps, as confirmed in Table 1 of the Skyworks datasheet Rev. 1.7. This specification applies to both wide-body and narrow-body SOIC packages under 15 pF load and standard supply conditions (VDD = 5 V ±10%). SI8445BB-D-ISR maintains timing and isolation integrity across this full range without derating.

Does SI8445BB-D-ISR require external bypass capacitors beyond the recommended VDD decoupling?

SI8445BB-D-ISR requires only 0.1 µF ceramic bypass capacitors on each VDD pin (VDD1 and VDD2), placed as close as possible to the respective pins. No additional external components-such as series resistors, termination networks, or ferrite beads-are required for basic operation. The datasheet explicitly states "only VDD bypass capacitors are required" for ease of design, and SI8445BB-D-ISR integrates internal series termination (~85 Ω) to minimize external component count.

Is SI8445BB-D-ISR pin-compatible with other members of the Si8440/41/42/45 family?

Yes, SI8445BB-D-ISR shares identical pinout and package (16-pin wide-body SOIC) with all Si844xBx variants, including SI8440BB-D-ISR, SI8441BB-D-ISR, and SI8442BB-D-ISR. Channel count, enable functionality, and supply pin assignments are consistent across the Bx-speed grade. However, data rate capability differs: SI8445BB-D-ISR supports 150 Mbps, whereas SI8440BB-D-ISR is limited to 1 Mbps-so functional substitution requires verification of speed requirements.

What safety certifications apply specifically to SI8445BB-D-ISR?

SI8445BB-D-ISR carries UL 1577 recognition (2500 V_RMS, File E257455), CSA Component Notice 5A certification (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 approval (File 5006301-4880-0001). All certifications cover the 2.5 kV_RMS isolation rating and apply to the wide-body SOIC package. Regulatory testing includes 1-second withstand at 3.0 kV_RMS and partial discharge <5 pC per IEC 60747-5-2.

Can SI8445BB-D-ISR operate with mismatched supply voltages on VDD1 and VDD2?

Yes, SI8445BB-D-ISR supports independent supply rails: VDD1 (side 1) and VDD2 (side 2) each operate from 2.70 V to 5.5 V, with no requirement for voltage matching. This enables level translation-for example, interfacing a 3.3 V FPGA (VDD1) to a 5 V analog subsystem (VDD2). Electrical characteristics (e.g., VIH/VIL thresholds, output drive) are specified per-side and remain valid across the full supply range per Skyworks Table 3 and Table 4.

SI8445BB-D-ISR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 4

Inputs - Side 1/Side 2:: 4/0

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

SI8445BB-D-ISR FAQ

1.How can I place an order for SI8445BB-D-ISR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8445BB-D-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 SI8445BB-D-ISR reliable?

The price and inventory of SI8445BB-D-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8445BB-D-ISR is usually 5 days.

3.What payment methods are accepted for SI8445BB-D-ISR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8445BB-D-ISR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8445BB-D-ISR?

SI8445BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8445BB-D-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 SI8445BB-D-ISR?

For technical support, including SI8445BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8445BB-D-ISR requirements.

6.How does Aetrix verify that SI8445BB-D-ISR is sourced from the original manufacturer or authorized distributors?

All SI8445BB-D-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 SI8445BB-D-ISR meets industry standards.

7.What is the process for return or replacement of SI8445BB-D-ISR?

All SI8445BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8445BB-D-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 SI8445BB-D-ISR part is unused and in its original packaging.

Return procedure for SI8445BB-D-ISR:

1.Submit a request within 90 days.

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

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