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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8461AB-B-IS1R

Name: SI8461AB-B-IS1R
Brand: Skyworks Solutions Inc.
SKU: SI8461AB-B-IS1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8461AB-B-IS1R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8461AB-B-IS1R.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8461AB-B-IS1R 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 channel at 100 Mbps (5 V), enabling high-speed isolated communication in motor control and industrial power inverters.

For engineers reviewing the SI8461AB-B-IS1R datasheet, SI8461AB-B-IS1R pinout, SI8461AB-B-IS1R application, or SI8461AB-B-IS1R equivalent, this page provides verified timing specs, safety certifications (UL 1577, VDE 0884-2, CSA 5A), isolation parameters (2500 VRMS), and real-world design values for PCB layout, power budgeting, and signal integrity validation.

Technical Context

The SI8461AB-B-IS1R implements capacitive isolation with on-chip RF modulation/demodulation circuitry, delivering deterministic timing performance across –40°C to +125°C ambient at 150 Mbps. Its dual-die architecture separates input and output domains with reinforced insulation, supporting independent VDD1/VDD2 supplies (2.70–5.5 V each) and enabling level-shifting between logic domains.

It features integrated 85 Ω ±40% output impedance per channel, precise pulse-width distortion control (<1.5 ns typ), and no start-up initialization-ensuring valid output within 40 µs of power application. The device meets IEC 60747-5-2 (VDE), UL 1577, and CSA Component Notice 5A requirements for reinforced insulation up to 2500 VRMS.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	Six unidirectional isolated signal paths - supports full-duplex or multi-signal isolation in single-package space-constrained designs.
Max Data Rate	150 Mbps - enables high-speed serial interfaces (e.g., isolated SPI, RS-485 transceiver control, gate driver feedback).
Propagation Delay	3.0–9.5 ns (typ/max) - ensures sub-10 ns timing predictability for real-time control loops in motor drives and inverters.
Channel-Channel Skew	0.5 ns (typ) - guarantees tight synchronization across multiple isolated signals (e.g., PWM dead-time monitoring, ADC sampling triggers).
Isolation Voltage	2500 VRMS (1 min) - certified for reinforced insulation per UL, VDE, and CSA standards; withstands 3600 VRMS transient surge.
Supply Range	2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog/power domains without level shifters.
CMTI	25 kV/µs - maintains signal integrity in noisy high-dv/dt environments like IGBT/SiC gate drive circuits and SMPS feedback paths.

Pinout & Package

SI8461AB-B-IS1R is housed in a RoHS-compliant 16-pin narrow-body SOIC package (5.3 mm width, 10.3 mm length), with creepage/clearance ≥3.9 mm and internal clearance ≥0.008 mm per IEC 60747-5-2.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side power supply	Supplies input-side logic and isolation transmitter; accepts 2.70–5.5 V; requires local 0.1 µF bypass capacitor.
GND1	Primary-side ground reference	Return path for VDD1 domain; must be separated from GND2 by isolation barrier; avoids ground loop coupling.
IN1–IN3	Input signal terminals (side 1)	Accept CMOS/TTL-compatible logic inputs (VIH ≥2.0 V, VIL ≤0.8 V); drive internal RF modulator.
OUT1–OUT3	Output signal terminals (side 2)	Deliver isolated CMOS outputs (VOH ≥VDD2–0.4 V, VOL ≤0.4 V); 85 Ω nominal output impedance for controlled-impedance routing.
VDD2	Secondary-side power supply	Supplies output-side logic and isolation receiver; independent of VDD1; enables level translation between domains.
GND2	Secondary-side ground reference	Return path for VDD2 domain; galvanically isolated from GND1; critical for noise rejection in high-voltage systems.

Key Features

Feature	Design Value
Ultra-low power at 100 Mbps	9.0 mA per channel @ 5 V - reduces thermal load and enables compact, fanless industrial enclosures.
No start-up initialization	Valid output within 40 µs of power-on - eliminates boot-time delays in safety-critical motor control and power supply sequencing.
Precision timing	1.5 ns pulse-width distortion (typ), 0.5 ns channel-channel skew - supports accurate PWM edge alignment and time-of-flight measurements.
High CMTI	25 kV/µs - prevents data corruption during fast switching transients in SiC/GaN-based inverters and HVDC systems.
Extended temperature range	–40°C to +125°C operation at full 150 Mbps - qualified for under-hood automotive and industrial ambient conditions.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks driving PMSM/BLDC motors. IC Role / Device Role / Timing Role: Six-channel isolator providing independent high-side/low-side gate drive enable, fault reporting, and ADC sampling trigger synchronization. Use Value: Sub-10 ns propagation delay and 0.5 ns channel skew ensure precise dead-time control and prevent shoot-through in IGBT/SiC modules.	Use Scenario: Providing primary-to-secondary isolation for feedback signals (voltage, current, temperature) and PWM controller enable/disable in 1–3 kW AC/DC converters. IC Role / Device Role / Timing Role: Isolating error amplifier output, overcurrent latch signals, and synchronous rectifier timing across transformer barrier. Use Value: 25 kV/µs CMTI prevents false triggering during MOSFET switching edges; 2500 VRMS rating satisfies reinforced insulation requirements for medical and ITE applications.
Hybrid Electric Vehicle Battery Management	Isolated Data Acquisition Systems
Use Scenario: Galvanically isolating cell voltage monitoring, pack contactor control, and thermal sensor interfaces in high-voltage battery packs (400–800 V DC). IC Role / Device Role / Timing Role: Transmitting precision analog front-end ADC results and digital status flags across isolation barrier to MCU domain. Use Value: 6.0 ns minimum pulse width and 150 Mbps capability support high-resolution, multi-cell BMS sampling at >10 kSPS rates with low latency.	Use Scenario: Isolating serial interface lines (SPI, UART) and trigger signals between high-voltage sensor front-ends and low-voltage host processors in test equipment and grid monitoring. IC Role / Device Role / Timing Role: Enabling robust communication between isolated ADC/DAC subsystems and FPGA/microcontroller controllers. Use Value: Independent VDD1/VDD2 supplies allow seamless integration with mixed-voltage sensor ICs (e.g., 5 V sensors + 3.3 V MCU), eliminating external level shifters.

Industrial Motor Control

Isolated Switch-Mode Power Supply

Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks driving PMSM/BLDC motors.

IC Role / Device Role / Timing Role: Six-channel isolator providing independent high-side/low-side gate drive enable, fault reporting, and ADC sampling trigger synchronization.

Use Value: Sub-10 ns propagation delay and 0.5 ns channel skew ensure precise dead-time control and prevent shoot-through in IGBT/SiC modules.

Use Scenario: Providing primary-to-secondary isolation for feedback signals (voltage, current, temperature) and PWM controller enable/disable in 1–3 kW AC/DC converters.

IC Role / Device Role / Timing Role: Isolating error amplifier output, overcurrent latch signals, and synchronous rectifier timing across transformer barrier.

Use Value: 25 kV/µs CMTI prevents false triggering during MOSFET switching edges; 2500 VRMS rating satisfies reinforced insulation requirements for medical and ITE applications.

Hybrid Electric Vehicle Battery Management

Isolated Data Acquisition Systems

Use Scenario: Galvanically isolating cell voltage monitoring, pack contactor control, and thermal sensor interfaces in high-voltage battery packs (400–800 V DC).

IC Role / Device Role / Timing Role: Transmitting precision analog front-end ADC results and digital status flags across isolation barrier to MCU domain.

Use Value: 6.0 ns minimum pulse width and 150 Mbps capability support high-resolution, multi-cell BMS sampling at >10 kSPS rates with low latency.

Use Scenario: Isolating serial interface lines (SPI, UART) and trigger signals between high-voltage sensor front-ends and low-voltage host processors in test equipment and grid monitoring.

IC Role / Device Role / Timing Role: Enabling robust communication between isolated ADC/DAC subsystems and FPGA/microcontroller controllers.

Use Value: Independent VDD1/VDD2 supplies allow seamless integration with mixed-voltage sensor ICs (e.g., 5 V sensors + 3.3 V MCU), eliminating external level shifters.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM140D0BRIZ	Four-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; higher typical supply current (12.5 mA/ch @ 100 Mbps, 5 V).	Limited to four channels; lacks native six-channel integration - requires two devices or additional routing for six-signal isolation.	Select when four-channel count suffices and ADI ecosystem compatibility is prioritized over channel density and ultra-low power.
ISO6760FDWR	Six-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed but higher isolation rating; 10 mA/ch @ 1 Mbps (5 V).	Better suited for high-isolation, lower-speed applications (e.g., PLC I/O modules) where 150 Mbps is unnecessary.	Choose when system-level safety requires >3 kVRMS working voltage and data rate demand is ≤50 Mbps.

Compared with ADUM140D0BRIZ and ISO6760FDWR, SI8461AB-B-IS1R uniquely balances six-channel density, 150 Mbps speed, sub-10 ns timing, and ultra-low active power - making it optimal for space- and latency-constrained industrial inverters and EV traction subsystems where both performance and efficiency are critical.

Availability

SI8461AB-B-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle battery management, and isolated switch-mode power supply designs requiring stable component supply, long-term lifecycle support, and certified 2500 VRMS isolation.

Supply support for SI8461AB-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 high-reliability applications.

The Si846x family was engineered to replace optocouplers in industrial, automotive, and energy infrastructure systems-delivering superior speed, longevity, and power efficiency while meeting stringent safety certification requirements.

FAQ

What is the maximum operating temperature for SI8461AB-B-IS1R at full 150 Mbps data rate?

The SI8461AB-B-IS1R is fully specified for continuous operation at –40°C to +125°C ambient temperature while sustaining 150 Mbps across all six channels. This rating is validated per Table 1 in the datasheet under 15 pF load and 5 V supply, making it suitable for under-hood automotive and high-temperature industrial environments without derating.

Does SI8461AB-B-IS1R require external components for basic operation?

SI8461AB-B-IS1R requires only two 0.1 µF ceramic bypass capacitors-one placed close to VDD1/GND1 and another near VDD2/GND2-as stated in the datasheet's "Features" section. No external resistors, transformers, or initialization firmware are needed; the device powers up with valid output within 40 µs.

How does SI8461AB-B-IS1R achieve its 25 kV/µs common-mode transient immunity?

SI8461AB-B-IS1R achieves 25 kV/µs CMTI through differential capacitive isolation architecture with tightly matched internal RF transmitter/receiver paths and optimized die layout that minimizes coupling asymmetry. This is measured per JEDEC standard JESD22-A114 with VI = VDD or 0 V, ensuring robustness against fast dv/dt noise in IGBT/SiC gate drivers.

Is SI8461AB-B-IS1R pin-compatible with other members of the Si846x family?

Yes-SI8461AB-B-IS1R shares identical pinout and footprint with all Si8460/61/62/63 variants in the narrow-body SOIC-16 package. Channel configuration (e.g., 3+3, 4+2, 5+1, 6+0) and speed grade (A = 1 Mbps, B = 150 Mbps) are determined by part number suffix, not pin assignment.

What safety certifications apply specifically to SI8461AB-B-IS1R?

SI8461AB-B-IS1R carries UL 1577 (File E257455), VDE IEC 60747-5-2 (File 5006301-4880-0001), and CSA Component Notice 5A (File 232873) certifications for 2500 VRMS reinforced insulation. These are production-tested to 3000 VRMS for 1 second per Table 6 and regulatory notes in the datasheet.

SI8461AB-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:: 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-B-IS1R FAQ

1.How can I place an order for SI8461AB-B-IS1R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8461AB-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 SI8461AB-B-IS1R reliable?

The price and inventory of SI8461AB-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 SI8461AB-B-IS1R is usually 5 days.

3.What payment methods are accepted for SI8461AB-B-IS1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8461AB-B-IS1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8461AB-B-IS1R?

SI8461AB-B-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8461AB-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 SI8461AB-B-IS1R?

For technical support, including SI8461AB-B-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8461AB-B-IS1R requirements.

6.How does Aetrix verify that SI8461AB-B-IS1R is sourced from the original manufacturer or authorized distributors?

All SI8461AB-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 SI8461AB-B-IS1R meets industry standards.

7.What is the process for return or replacement of SI8461AB-B-IS1R?

All SI8461AB-B-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8461AB-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 SI8461AB-B-IS1R part is unused and in its original packaging.

Return procedure for SI8461AB-B-IS1R:

1.Submit a request within 90 days.

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

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