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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8461AB-A-IS1

Name: SI8461AB-A-IS1
Brand: Skyworks Solutions Inc.
SKU: SI8461AB-A-IS1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8461AB-A-IS1

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8461AB-A-IS1.pdf

Description:: DGTL ISO 2500VRMS 6CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8461AB-A-IS1 from Skyworks Solutions is a six-channel, ultra-low-power digital isolator in a 16-pin narrow-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 <9.0 mA per side at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated power supplies.

For engineers reviewing the SI8461AB-A-IS1 datasheet, SI8461AB-A-IS1 pinout, SI8461AB-A-IS1 application, or SI8461AB-A-IS1 equivalent, key selection criteria include its 150 Mbps capability, 2.5 kV_RMS reinforced insulation rating, –40°C to +125°C operation at full speed, and compatibility with 2.7–5.5 V logic interfaces on both sides - critical for industrial inverters and isolated ADC/DAC signal chains.

Technical Context

The SI8461AB-A-IS1 implements capacitive isolation using differential RF signaling across an internal SiO₂ barrier, delivering precise timing with 1.5 ns typical pulse width distortion and 2 ns propagation delay skew. Its architecture supports independent VDD1/VDD2 supplies, enabling level-shifting between 2.7 V and 5.5 V domains without external level translators.

It requires no start-up initialization and achieves stable performance over temperature due to on-chip calibration of timing parameters. The device meets UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 safety standards, with 60-year lifetime at rated working voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	Six unidirectional isolated signal paths - enables full isolation of three-phase gate drivers plus status feedback in motor drives.
Max Data Rate	150 Mbps - supports high-resolution PWM sampling and fast serial interface isolation (e.g., SPI clocked at 75 MHz).
Propagation Delay	3.0–9.5 ns (typ–max) - ensures sub-10 ns timing alignment critical for synchronous switching in SiC/GaN inverters.
Channel-Channel Skew	0.5 ns (typ), ≤1.8 ns (max) - maintains phase coherence across multi-channel control signals like 3-phase PWM outputs.
Isolation Voltage	2500 V_RMS (1 min) - certified for reinforced insulation per UL/CSA/VDE, suitable for 400 V AC mains-connected systems.
Supply Range	2.70–5.5 V on both sides - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters.
CMTI	≥25 kV/µs - rejects fast transients from power switches, preventing false triggering in noisy inverter environments.

Pinout & Package

The SI8461AB-A-IS1 is housed in a RoHS-compliant 16-pin narrow-body SOIC package (5.3 mm width, 10.3 mm length) with 1.27 mm pitch, optimized for high-density industrial PCB layouts and compatible with standard SOIC reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side power supply	Supplies input-side logic and isolation transmitter; accepts 2.7–5.5 V with bypass capacitor required.
GND1	Primary-side ground reference	Reference for all input-side signals; must be separated from GND2 by isolation barrier.
IN1–IN3	Input signal terminals (side 1)	Accept CMOS/TTL-compatible digital inputs; VIH ≥2.0 V, VIL ≤0.8 V at 3.3/5 V operation.
OUT1–OUT3	Output signal terminals (side 2)	Drive CMOS loads with VOH ≥VDD2–0.4 V, VOL ≤0.4 V; output impedance ≈85 Ω for controlled-impedance routing.
VDD2	Secondary-side power supply	Supplies output-side logic and isolation receiver; independently regulated from VDD1.
GND2	Secondary-side ground reference	Reference for all output-side signals; galvanically isolated from GND1.
IN4–IN6	Additional input terminals (side 1)	Enable full six-channel configuration - e.g., three PWM inputs + three fault feedback signals.
OUT4–OUT6	Additional output terminals (side 2)	Support bidirectional signal flow when paired with external direction control logic.

Key Features

Feature	Design Value
Ultra-low power at 100 Mbps	9.0 mA per side (5 V), enabling thermally constrained designs in sealed enclosures or fanless inverters.
Precision timing performance	1.5 ns typical pulse width distortion and 0.5 ns channel-channel skew - preserves PWM duty cycle fidelity across channels.
No initialization requirement	Valid output within 40 µs of power-on - eliminates boot-time delays in safety-critical startup sequences.
High CMTI immunity	25 kV/µs minimum - suppresses noise coupling from high-dV/dt power switches into gate driver control logic.
Extended temperature operation	Full 150 Mbps performance from –40°C to +125°C - validated for under-hood automotive and industrial ambient conditions.

Applications

Motor Control Systems	Isolated Switch-Mode Power Supplies
Use Scenario: Isolating gate drive signals and current-sense feedback in three-phase inverter stacks for HVAC compressors and EV traction inverters. IC Role / Device Role / Timing Role: Six-channel isolator provides independent PWM input isolation and fault signal return across the high-voltage barrier with <10 ns propagation delay. Use Value: Enables precise dead-time control and fast fault response (<100 ns loop time) while meeting reinforced insulation requirements for 600 V DC bus systems.	Use Scenario: Isolating feedback signals (voltage/current) from secondary-side controllers to primary-side PWM controllers in LLC and flyback converters. IC Role / Device Role / Timing Role: Transmits error amplifier output and synchronous rectifier timing across isolation barrier with minimal latency and jitter. Use Value: Maintains tight regulation bandwidth (>100 kHz) and improves transient response by reducing isolation-induced delay in closed-loop control.
Industrial Automation I/O Modules	Isolated Data Acquisition
Use Scenario: Digitally isolating digital input/output lines in PLC backplanes and distributed I/O terminals exposed to 24 V DC field wiring. IC Role / Device Role / Timing Role: Provides six independent isolation channels for discrete sensor inputs and actuator outputs with common-mode noise rejection. Use Value: Eliminates ground loops and prevents ESD-induced latch-up in harsh factory environments with >25 kV/µs transient immunity.	Use Scenario: Isolating serial interface lines (SPI, I²C) between isolated ADC/DAC converters and host microcontrollers in medical and test equipment. IC Role / Device Role / Timing Role: Transfers high-resolution conversion data at up to 150 Mbps while maintaining signal integrity across isolation boundary. Use Value: Supports 16-bit+ resolution sampling at >1 MSPS without timing skew-induced harmonic distortion in isolated measurement paths.

Motor Control Systems

Isolated Switch-Mode Power Supplies

Use Scenario: Isolating gate drive signals and current-sense feedback in three-phase inverter stacks for HVAC compressors and EV traction inverters.

IC Role / Device Role / Timing Role: Six-channel isolator provides independent PWM input isolation and fault signal return across the high-voltage barrier with <10 ns propagation delay.

Use Value: Enables precise dead-time control and fast fault response (<100 ns loop time) while meeting reinforced insulation requirements for 600 V DC bus systems.

Use Scenario: Isolating feedback signals (voltage/current) from secondary-side controllers to primary-side PWM controllers in LLC and flyback converters.

IC Role / Device Role / Timing Role: Transmits error amplifier output and synchronous rectifier timing across isolation barrier with minimal latency and jitter.

Use Value: Maintains tight regulation bandwidth (>100 kHz) and improves transient response by reducing isolation-induced delay in closed-loop control.

Industrial Automation I/O Modules

Isolated Data Acquisition

Use Scenario: Digitally isolating digital input/output lines in PLC backplanes and distributed I/O terminals exposed to 24 V DC field wiring.

IC Role / Device Role / Timing Role: Provides six independent isolation channels for discrete sensor inputs and actuator outputs with common-mode noise rejection.

Use Value: Eliminates ground loops and prevents ESD-induced latch-up in harsh factory environments with >25 kV/µs transient immunity.

Use Scenario: Isolating serial interface lines (SPI, I²C) between isolated ADC/DAC converters and host microcontrollers in medical and test equipment.

IC Role / Device Role / Timing Role: Transfers high-resolution conversion data at up to 150 Mbps while maintaining signal integrity across isolation boundary.

Use Value: Supports 16-bit+ resolution sampling at >1 MSPS without timing skew-induced harmonic distortion in isolated measurement paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRZ	Four-channel, 150 Mbps, 2.5 kV_RMS, SOIC-16; lacks sixth channel and has higher 12 ns max propagation delay.	Insufficient channel count for full three-phase gate drive + feedback; suitable only for 4-signal isolation tasks.	Select when four isolated signals suffice and ADI ecosystem integration is prioritized.
ISO6760DR	Six-channel, 50 Mbps, 5000 V_RMS, SOIC-16; lower speed but higher isolation rating and lower 1.5 mA/Mbps power consumption.	Better suited for low-speed, high-isolation applications (e.g., energy metering); not viable for 100+ Mbps PWM control.	Choose for cost-sensitive, low-data-rate systems requiring >4 kV_RMS isolation and extended creepage.

Compared with ADUM140D0BRZ and ISO6760DR, the SI8461AB-A-IS1 uniquely balances six-channel count, 150 Mbps speed, and 2.5 kV_RMS certification - making it optimal for space-constrained, high-performance motor control where channel density and timing precision are non-negotiable.

Availability

SI8461AB-A-IS1 is available at Aetrix Electronics and suitable for industrial automation systems, hybrid electric vehicle power stages, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SI8461AB-A-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 for high-reliability applications.

The Si84xx family was designed specifically for high-speed, low-power digital isolation in demanding industrial, automotive, and computing systems - emphasizing timing accuracy, safety certification, and robustness against fast transients.

FAQ

What is the maximum operating temperature for SI8461AB-A-IS1 at full 150 Mbps data rate?

The SI8461AB-A-IS1 is fully specified for operation from –40°C to +125°C at 150 Mbps, with all timing and electrical parameters guaranteed across this range when loaded with 15 pF and powered at 2.7–5.5 V. This makes SI8461AB-A-IS1 suitable for under-hood automotive and high-ambient industrial environments without derating.

Does SI8461AB-A-IS1 require external components for basic operation?

Yes - SI8461AB-A-IS1 requires only two 0.1 µF ceramic bypass capacitors: one between VDD1 and GND1, and another between VDD2 and GND2. No pull-up/down resistors, level shifters, or initialization firmware are needed, simplifying layout and reducing BOM count compared to optocoupler-based solutions.

How does SI8461AB-A-IS1 achieve its 25 kV/µs CMTI rating?

SI8461AB-A-IS1 achieves ≥25 kV/µs common-mode transient immunity through differential capacitive coupling, on-chip noise cancellation circuitry, and optimized internal layout that minimizes coupling between input and output die sections. This specification is measured per JEDEC JESD22-A114 and verified across the full –40°C to +125°C range.

Is SI8461AB-A-IS1 pin-compatible with other members of the Si846x family?

Yes - SI8461AB-A-IS1 shares identical pinout and package with all Si8460/61/62/63 variants in the narrow-body SOIC-16 footprint. However, channel direction (unidirectional vs. bidirectional) and speed grade (A = 1 Mbps, B = 150 Mbps) differ; SI8461AB-A-IS1 is unidirectional B-grade, so substitution requires verifying signal flow direction and speed requirements.

What safety certifications apply to SI8461AB-A-IS1?

SI8461AB-A-IS1 is certified to UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These cover reinforced insulation for working voltages up to 300 V_RMS (CSA) and 560 V_PEAK (VDE), with production testing to 3000 V_RMS for 1 second per regulatory compliance.

SI8461AB-A-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:: 6

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

Channel Type:: Unidirectional

Voltage - Isolation:: 2500Vrms

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

Data Rate:: 1Mbps

Propagation Delay tpLH / tpHL (Max):: 35ns, 35ns

Pulse Width Distortion (Max):: 25ns

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

SI8461AB-A-IS1 FAQ

1.How can I place an order for SI8461AB-A-IS1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8461AB-A-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 SI8461AB-A-IS1 reliable?

The price and inventory of SI8461AB-A-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8461AB-A-IS1 is usually 5 days.

3.What payment methods are accepted for SI8461AB-A-IS1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8461AB-A-IS1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8461AB-A-IS1?

SI8461AB-A-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8461AB-A-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 SI8461AB-A-IS1?

For technical support, including SI8461AB-A-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8461AB-A-IS1 requirements.

6.How does Aetrix verify that SI8461AB-A-IS1 is sourced from the original manufacturer or authorized distributors?

All SI8461AB-A-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 SI8461AB-A-IS1 meets industry standards.

7.What is the process for return or replacement of SI8461AB-A-IS1?

All SI8461AB-A-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8461AB-A-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 SI8461AB-A-IS1 part is unused and in its original packaging.

Return procedure for SI8461AB-A-IS1:

1.Submit a request within 90 days.

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

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