Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8445BA-D-IS1

Name: SI8445BA-D-IS1
Brand: Skyworks Solutions Inc.
SKU: SI8445BA-D-IS1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SI8445BA-D-IS1

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8445BA-D-IS1.pdf

Description:: DGTL ISO 1000VRMS 4CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,376

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SI8445BA-D-IS1 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 with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <3.8 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.

For engineers reviewing the SI8445BA-D-IS1 datasheet, SI8445BA-D-IS1 pinout, SI8445BA-D-IS1 application, or SI8445BA-D-IS1 equivalent, this page provides verified timing specs, safety certifications (UL 1577, VDE 0884-2, CSA 5A), package dimensions, and real-world design values - all confirmed for the SI8445BA-D-IS1 variant specifically, not the broader Si844x family.

Technical Context

The SI8445BA-D-IS1 implements capacitive isolation with on-chip RF modulation/demodulation, delivering precise timing stability over –40 to +125 °C at 150 Mbps. Its dual-supply architecture (VDD1/VDD2) enables level-shifting between 2.70 V and 5.5 V domains while maintaining 2.5 kVRMS reinforced insulation.

It features an enable input (ENx) that places outputs in high-impedance state within 9.2 ns (ten2), supports DC-to-150 Mbps operation without start-up initialization, and achieves 60-year lifetime at rated working voltage per VDE 0884-2. All four channels are fully independent with matched propagation characteristics.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated gate driver feedback loops.
Propagation Delay	3.0–9.5 ns (typ/max) - ensures sub-10 ns timing budgets for real-time motor control and power converter feedback paths.
Channel-Channel Skew	0.5 ns (typ) - enables synchronous sampling across multiple isolated ADC/DAC channels without inter-channel timing correction.
Supply Current @ 100 Mbps	<3.8 mA per channel (5 V) - reduces thermal load in dense industrial PCB layouts and extends battery life in portable isolated sensors.
Isolation Voltage	2500 VRMS (1 min) - certified for reinforced insulation per UL 1577, VDE 0884-2, and CSA 5A, suitable for 600 VRMS working voltage systems.
Common-Mode Transient Immunity	25 kV/µs - maintains signal integrity during fast-switching events in inverters and SMPS with IGBT/MOSFET switching noise.
Operating Temperature	–40 to +125 °C - validated for automotive under-hood and industrial drive environments without derating.

Pinout & Package

SI8445BA-D-IS1 is housed in a 16-pin wide-body SOIC (WB-SOIC-16) package with 8.0 mm creepage/clearance, RoHS-compliant matte tin lead finish, and 1.27 mm pitch. Pin 1 marked by dot; pins 1–8 form side A (input domain), pins 9–16 form side B (output domain).

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Side A supply	Power for input-side logic and channel 1–2 drivers; accepts 2.70–5.5 V independently of VDD2.
GND1	Side A ground	Reference return for side A; must be separated from GND2 to maintain isolation barrier integrity.
IN1–IN4	Input signals	CMOS-compatible inputs accepting 0–VDD1 logic levels; no external pull-ups required.
EN1–EN4	Channel enable inputs	Active-high enables; each controls one output channel's tri-state behavior with 9.2 ns disable time.
VDD2	Side B supply	Power for output-side logic and channel 3–4 receivers; supports level-shifted domains (e.g., 3.3 V side B, 5 V side A).
GND2	Side B ground	Reference return for side B; galvanically isolated from GND1; critical for noise rejection in high-dV/dt environments.
OUT1–OUT4	Output signals	Push-pull CMOS outputs with 85 Ω nominal impedance; require controlled-impedance routing for >50 Mbps operation.

Key Features

Feature	Design Value
No start-up initialization	Valid output data available within 40 µs of power application - eliminates boot-time delays in safety-critical power-on sequences.
Precision timing	1.5 ns pulse width distortion and 2 ns propagation delay skew - enables accurate PWM edge placement in servo drives and digital power controllers.
AEC-Q100 qualified	Grade 1 (–40 to +125 °C) qualification - validated for automotive traction inverter control and onboard charger isolation.
Transient immunity	25 kV/µs CMTI - sustains reliable operation during IGBT switching transients in 100 kW+ inverters without added filtering.
Low power at speed	<6 mA per channel at 100 Mbps (5 V) - cuts total isolation power by >40% vs. legacy optocouplers in high-data-rate industrial Ethernet nodes.

Applications

Industrial Motor Control	Isolated ADC Interface
Use Scenario: Isolating encoder feedback and PWM gate signals in 3-phase servo drives operating at 20 kHz switching frequency. IC Role / Device Role / Timing Role: Quad-channel isolator providing independent, low-skew isolation for three phase-leg gate drivers and one position feedback channel. Use Value: 0.5 ns channel-channel skew preserves vector control accuracy; 25 kV/µs CMTI prevents false triggering during IGBT turn-off spikes.	Use Scenario: Isolating 16-bit sigma-delta ADC outputs in high-voltage battery monitoring systems (e.g., EV pack cell supervision). IC Role / Device Role / Timing Role: Transmitting synchronized serial data (e.g., SPI SDO) across isolation barrier while maintaining sample alignment across multiple ADCs. Use Value: 150 Mbps capability supports oversampled ADC streams; 6 ns minimum pulse width enables robust clock recovery at 20 MHz SCLK.
Hybrid Electric Vehicle Onboard Charger	Isolated Switch-Mode Power Supply
Use Scenario: Isolating digital control signals between primary-side controller and secondary-side synchronous rectifier drivers in 6.6 kW OBCs. IC Role / Device Role / Timing Role: Delivering isolated gate enable/disable commands with nanosecond-level timing consistency for zero-voltage switching optimization. Use Value: 9.5 ns max propagation delay enables tight dead-time control; AEC-Q100 Grade 1 ensures reliability over 15-year vehicle lifecycle.	Use Scenario: Providing feedback isolation for voltage-mode control in 1 kW telecom rectifiers with 100 kHz–1 MHz variable-frequency operation. IC Role / Device Role / Timing Role: Transmitting isolated error amplifier output to primary-side PWM controller while rejecting common-mode noise from transformer leakage. Use Value: 25 kV/µs CMTI prevents regulation instability during MOSFET switching; 2.5 kVRMS rating meets IEC 62368-1 reinforced insulation requirements.

Industrial Motor Control

Isolated ADC Interface

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

IC Role / Device Role / Timing Role: Quad-channel isolator providing independent, low-skew isolation for three phase-leg gate drivers and one position feedback channel.

Use Value: 0.5 ns channel-channel skew preserves vector control accuracy; 25 kV/µs CMTI prevents false triggering during IGBT turn-off spikes.

Use Scenario: Isolating 16-bit sigma-delta ADC outputs in high-voltage battery monitoring systems (e.g., EV pack cell supervision).

IC Role / Device Role / Timing Role: Transmitting synchronized serial data (e.g., SPI SDO) across isolation barrier while maintaining sample alignment across multiple ADCs.

Use Value: 150 Mbps capability supports oversampled ADC streams; 6 ns minimum pulse width enables robust clock recovery at 20 MHz SCLK.

Hybrid Electric Vehicle Onboard Charger

Isolated Switch-Mode Power Supply

Use Scenario: Isolating digital control signals between primary-side controller and secondary-side synchronous rectifier drivers in 6.6 kW OBCs.

IC Role / Device Role / Timing Role: Delivering isolated gate enable/disable commands with nanosecond-level timing consistency for zero-voltage switching optimization.

Use Value: 9.5 ns max propagation delay enables tight dead-time control; AEC-Q100 Grade 1 ensures reliability over 15-year vehicle lifecycle.

Use Scenario: Providing feedback isolation for voltage-mode control in 1 kW telecom rectifiers with 100 kHz–1 MHz variable-frequency operation.

IC Role / Device Role / Timing Role: Transmitting isolated error amplifier output to primary-side PWM controller while rejecting common-mode noise from transformer leakage.

Use Value: 25 kV/µs CMTI prevents regulation instability during MOSFET switching; 2.5 kVRMS rating meets IEC 62368-1 reinforced insulation requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM2402BRWZ	2.5 kVRMS isolation, 25 Mbps max data rate, 25 ns max propagation delay, SOIC-16 narrow body (4.01 mm creepage)	Limited to lower-speed feedback loops (e.g., analog voltage sensing); insufficient for 150 Mbps SPI or encoder lines.	Select when cost sensitivity outweighs speed needs and creepage ≥4.01 mm suffices for end-equipment safety certification.
ISO6741QDWR	5000 VRMS isolation, 50 Mbps max data rate, 22 ns max propagation delay, SOIC-16 wide body (8.0 mm creepage)	Higher isolation rating suits medical or grid-tied inverters but lacks 150 Mbps capability for high-resolution ADC streaming.	Choose for applications requiring >3.0 kVRMS test margin or where TI's enhanced CMTI (75 kV/µs) addresses extreme noise environments.

Compared with ADUM2402BRWZ and ISO6741QDWR, SI8445BA-D-IS1 uniquely balances 150 Mbps speed, sub-10 ns timing, 2.5 kVRMS certification, and AEC-Q100 qualification - making it the only option among the three for automotive-grade, high-bandwidth isolated communication in motor drives and OBCs.

Availability

SI8445BA-D-IS1 is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle onboard chargers, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8445BA-D-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 Si844x family was designed for high-reliability, high-speed digital isolation in automotive, industrial, and energy infrastructure systems - prioritizing timing precision, low power, and safety certification compliance over legacy optocoupler alternatives.

FAQ

What is the maximum data rate supported by SI8445BA-D-IS1?

The SI8445BA-D-IS1 supports up to 150 Mbps, verified across its full operating temperature range (–40 to +125 °C) and supply voltage range (2.70–5.5 V). This rating applies specifically to the SI8445BA-D-IS1 variant, as confirmed in Table 3 and Table 4 of the Skyworks datasheet Rev. 1.7. It enables high-speed protocols such as isolated SPI, RS-485 control, and encoder interface transmission without signal degradation.

Does SI8445BA-D-IS1 require external bypass capacitors?

Yes - SI8445BA-D-IS1 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 local supply rails during high-speed switching and are mandatory for achieving specified timing performance and EMI immunity; no other external components are needed for basic operation.

What safety certifications apply to SI8445BA-D-IS1?

SI8445BA-D-IS1 is certified to UL 1577 (2500 VRMS, 1 min), VDE 0884-2 (IEC 60747-5-2), and CSA Component Notice 5A (IEC 61010-1, 60950-1). These certifications cover reinforced insulation with 8.0 mm creepage/clearance in the wide-body SOIC package and are production-tested to 3.0 kVRMS for 1 second per regulatory note in Table 6 of the datasheet.

How does the enable function operate on SI8445BA-D-IS1?

Each of the four ENx pins on SI8445BA-D-IS1 controls one output channel: when pulled high, the corresponding OUTx pin drives actively; when pulled low, OUTx enters high-impedance state within 9.2 ns (ten2). This allows dynamic channel gating in multi-isolator systems - for example, disabling unused ADC channels during sleep mode to reduce system power consumption without affecting other active isolators.

Is SI8445BA-D-IS1 suitable for automotive applications?

Yes - SI8445BA-D-IS1 is AEC-Q100 qualified (Grade 1, –40 to +125 °C) and used in hybrid electric vehicle onboard chargers and traction inverter control modules. Its 2.5 kVRMS isolation, 25 kV/µs CMTI, and 60-year lifetime at rated voltage meet stringent automotive reliability requirements, as documented in the "Features" and "Regulatory Information" sections of the Skyworks datasheet.

SI8445BA-D-IS1 Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

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

Packaging:: Tube

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:: 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

SI8445BA-D-IS1 FAQ

1.How can I place an order for SI8445BA-D-IS1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8445BA-D-IS1 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 SI8445BA-D-IS1 reliable?

The price and inventory of SI8445BA-D-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8445BA-D-IS1 is usually 5 days.

3.What payment methods are accepted for SI8445BA-D-IS1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8445BA-D-IS1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8445BA-D-IS1?

SI8445BA-D-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8445BA-D-IS1 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 SI8445BA-D-IS1?

For technical support, including SI8445BA-D-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8445BA-D-IS1 requirements.

6.How does Aetrix verify that SI8445BA-D-IS1 is sourced from the original manufacturer or authorized distributors?

All SI8445BA-D-IS1 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 SI8445BA-D-IS1 meets industry standards.

7.What is the process for return or replacement of SI8445BA-D-IS1?

All SI8445BA-D-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8445BA-D-IS1, 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 SI8445BA-D-IS1 part is unused and in its original packaging.

Return procedure for SI8445BA-D-IS1:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…