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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8660BB-B-IUR

Name: SI8660BB-B-IUR
Brand: Skyworks Solutions Inc.
SKU: SI8660BB-B-IUR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8660BB-B-IUR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

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

Datasheet:: SI8660BB-B-IUR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8660BB-B-IUR from Skyworks is a six-channel, unidirectional digital isolator with 6 input channels on VDD1 side and 0 on VDD2 side, rated for 2.5 kVRMS isolation, 150 Mbps data rate, and operation from –40 to 125 °C. It features Schmitt-trigger inputs, selectable fail-safe low-default output, and ultra-low power consumption-1.6 mA per channel at 1 Mbps (5 V), enabling use in isolated motor control gate drivers and industrial PLC I/O modules.

For engineers reviewing the SI8660BB-B-IUR datasheet, SI8660BB-B-IUR pinout, SI8660BB-B-IUR application, or SI8660BB-B-IUR equivalent, this page delivers verified specifications, package mapping to SOIC-16 narrow body, functional pin assignments, automotive-grade compatibility notes, and two validated alternative part numbers with documented technical and application differences.

Technical Context

The SI8660BB-B-IUR implements RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required, with undervoltage lockout (UVLO) on both sides (VDDUV+ = 2.24 V typ, hysteresis = 70 mV). Its architecture delivers precise timing: 8 ns typical propagation delay, 0.5 ns channel-channel skew, and 2 ns propagation delay skew between units.

All six channels are unidirectional from VDD1 to VDD2, supporting DC–150 Mbps operation with 5 ns minimum pulse width and 350 ps peak eye diagram jitter. Input thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) and 0.44 V input hysteresis ensure robust noise immunity in noisy industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels / Direction	6 unidirectional (VDD1 → VDD2), zero reverse channels - enables clean separation of control-side logic from power-stage side without bidirectional contention.
Max Data Rate	150 Mbps - supports high-speed serial interfaces like isolated SPI clock lines or real-time encoder feedback in servo drives.
Isolation Rating	2.5 kVRMS - certified to UL 1577, CSA 5A, VDE 0884-10, and IEC 62368-1 reinforced insulation standards for industrial safety compliance.
Propagation Delay	8 ns typical (5–13 ns max) - ensures tight timing alignment in synchronous isolated gate driver circuits and ADC sampling triggers.
Supply Voltage Range	2.375–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting.
Power @ 1 Mbps	1.6 mA/channel @ 5 V - reduces thermal load in densely packed I/O modules and extends battery life in portable test equipment.
CMTI	50 kV/µs typical - suppresses false triggering during fast-switching events in SiC/GaN inverter half-bridges.

Pinout & Package

SI8660BB-B-IUR is housed in a RoHS-compliant 16-pin narrow-body SOIC (NB SOIC-16) package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and 2.35 mm height. Creepage/clearance meets 8 mm requirements for reinforced insulation at 2.5 kVRMS.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side supply	Power for all 6 input-side channels and internal transmitter circuitry; bypass 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.
IN1–IN6	Digital inputs	CMOS-compatible Schmitt-trigger inputs with 1.67 V rising threshold; tolerate 0–5.5 V logic levels.
VDD2	Output-side supply	Power for output drivers and receiver circuitry; independent of VDD1 for true galvanic isolation.
GND2	Output-side ground	Reference return for VDD2 and all output signals; forms isolated domain with VDD2.
OUT1–OUT6	Digital outputs	Push-pull CMOS outputs with 50 Ω nominal impedance; drive 15 pF loads directly at 150 Mbps.

Key Features

Feature	Design Value
Selectable fail-safe output	Low-default state during VDD1 loss - prevents unintended activation of downstream MOSFET gates in power supply fault conditions.
No initialization required	Immediate data transmission after UVLO exit - eliminates boot-time delays in safety-critical motor control loops.
Ultra-low power at speed	5.5 mA/channel @ 100 Mbps (5 V) - enables 6-channel isolation in thermally constrained enclosures without forced air cooling.
Precise inter-channel timing	0.5 ns max channel-channel skew - maintains phase coherence across multi-phase current sensing or PWM signal distribution.
High CMTI immunity	50 kV/µs common-mode transient rejection - sustains reliable operation adjacent to 100 A SiC half-bridges switching at 100 kHz.

Applications

Industrial Motor Control	Isolated Power Supply Feedback
Use Scenario: Isolating gate drive signals and current-sense feedback in 3-phase inverter stacks for HVAC compressors and EV traction inverters. IC Role / Device Role / Timing Role: Six-channel unidirectional isolator transmitting PWM enable, fault flags, and analog-to-digital converter outputs across isolation barrier. Use Value: 8 ns propagation delay and 0.5 ns channel skew preserve dead-time integrity and prevent shoot-through in IGBT/SiC gate drivers.	Use Scenario: Providing isolated voltage and current feedback from secondary-side sensing to primary-side controller in flyback and LLC resonant converters. IC Role / Device Role / Timing Role: Transmitting error amplifier outputs and overcurrent alerts across 2.5 kVRMS barrier with fail-safe low default. Use Value: Fail-safe low output disables PWM during primary-side power loss, preventing uncontrolled output voltage rise.
Programmable Logic Controller I/O	Medical Isolated Data Acquisition
Use Scenario: Digitally isolating 24 V DC field inputs and relay/SSR outputs in modular PLC backplanes operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: Six-channel isolator converting industrial-level inputs to 3.3 V logic while rejecting ground-loop noise and surge transients. Use Value: 50 kV/µs CMTI and Schmitt-trigger inputs reject >1 kV fast transients induced by contactor switching in adjacent cabinets.	Use Scenario: Isolating patient-connected sensor front-ends (ECG, EEG) from digital processing units in diagnostic imaging and monitoring systems. IC Role / Device Role / Timing Role: Transmitting digitized biopotential waveforms across reinforced insulation barrier compliant with IEC 60601-1. Use Value: 2.5 kVRMS rating and VDE 0884-10 certification meet creepage/clearance and working voltage requirements for Type BF applied parts.

Industrial Motor Control

Isolated Power Supply Feedback

Use Scenario: Isolating gate drive signals and current-sense feedback in 3-phase inverter stacks for HVAC compressors and EV traction inverters.

IC Role / Device Role / Timing Role: Six-channel unidirectional isolator transmitting PWM enable, fault flags, and analog-to-digital converter outputs across isolation barrier.

Use Value: 8 ns propagation delay and 0.5 ns channel skew preserve dead-time integrity and prevent shoot-through in IGBT/SiC gate drivers.

Use Scenario: Providing isolated voltage and current feedback from secondary-side sensing to primary-side controller in flyback and LLC resonant converters.

IC Role / Device Role / Timing Role: Transmitting error amplifier outputs and overcurrent alerts across 2.5 kVRMS barrier with fail-safe low default.

Use Value: Fail-safe low output disables PWM during primary-side power loss, preventing uncontrolled output voltage rise.

Programmable Logic Controller I/O

Medical Isolated Data Acquisition

Use Scenario: Digitally isolating 24 V DC field inputs and relay/SSR outputs in modular PLC backplanes operating in factory-floor EMI environments.

IC Role / Device Role / Timing Role: Six-channel isolator converting industrial-level inputs to 3.3 V logic while rejecting ground-loop noise and surge transients.

Use Value: 50 kV/µs CMTI and Schmitt-trigger inputs reject >1 kV fast transients induced by contactor switching in adjacent cabinets.

Use Scenario: Isolating patient-connected sensor front-ends (ECG, EEG) from digital processing units in diagnostic imaging and monitoring systems.

IC Role / Device Role / Timing Role: Transmitting digitized biopotential waveforms across reinforced insulation barrier compliant with IEC 60601-1.

Use Value: 2.5 kVRMS rating and VDE 0884-10 certification meet creepage/clearance and working voltage requirements for Type BF applied parts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM160N0BRZ-RL7	6-channel, 150 Mbps, 3.75 kVRMS, SOIC-16 NB; higher 2.5 mA/channel @ 1 Mbps (5 V); no fail-safe option.	Requires external pull-down for default-low behavior; lacks integrated fail-safe mode.	Choose when higher isolation rating is mandatory and system-level fail-safe logic can be implemented externally.
ISO6760QDWR	6-channel, 50 Mbps, 5 kVRMS, SOIC-16 WB; 1.8–5.5 V supply; 1.2 mA/channel @ 1 Mbps (3.3 V); fails high by default.	Lower data rate limits use in high-speed encoder interfaces; wider SOIC-16 package increases PCB area.	Choose when 5 kVRMS reinforced insulation is required and 50 Mbps suffices for control loop bandwidth.

Compared with SI8660BB-B-IUR, ADUM160N0BRZ-RL7 offers higher isolation but no built-in fail-safe, while ISO6760QDWR provides greater isolation voltage in a wider package at reduced speed-making SI8660BB-B-IUR optimal for cost- and space-constrained 150 Mbps industrial control where fail-safe low is critical.

Availability

SI8660BB-B-IUR is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply feedback, and medical data acquisition requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned manufacturing rigor.

Supply support for SI8660BB-B-IUR 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 Si866x family was engineered for high-reliability industrial and automotive isolation, delivering ultra-low power, sub-10 ns timing, and safety-certified reinforcement without optical or magnetic coupling limitations.

FAQ

What is the isolation rating and safety certification status of SI8660BB-B-IUR?

The SI8660BB-B-IUR is rated for 2.5 kVRMS isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10, and IEC 62368-1 (reinforced insulation). These certifications validate its suitability for industrial equipment requiring reinforced insulation barriers, and it meets creepage/clearance requirements for 2.5 kVRMS working voltage in NB SOIC-16 packaging. SI8660BB-B-IUR does not carry AEC-Q100 qualification, as it is an industrial-grade part (suffix "-I").

Does SI8660BB-B-IUR support bidirectional communication?

No, SI8660BB-B-IUR is strictly unidirectional: all six channels transmit from the VDD1 side to the VDD2 side only. The ordering guide confirms "6 inputs VDD1 side / 0 inputs VDD2 side" for this part number. For bidirectional capability, engineers must select variants like SI8663BB-B-IUR (3/3 channel split) or combine multiple unidirectional isolators. SI8660BB-B-IUR's fixed directionality simplifies layout and eliminates contention risks in gate-drive or feedback signal paths.

What is the default output state during input-side power loss, and how is it implemented?

SI8660BB-B-IUR has a low-default fail-safe output state, determined by its "BB" ordering code (per Table 1.1). When VDD1 is unpowered and VDD2 remains active, outputs OUT1–OUT6 are actively driven low. This behavior is implemented via internal pull-down networks on the output side-no external components required. The feature prevents undefined states in downstream logic or gate drivers during brownout or startup, and SI8660BB-B-IUR guarantees sub-1 µs recovery to input-following behavior once VDD1 rises above UVLO+ (2.24 V).

Can SI8660BB-B-IUR operate with mixed supply voltages, such as 3.3 V on VDD1 and 5 V on VDD2?

Yes, SI8660BB-B-IUR supports independent supply rails: VDD1 and VDD2 each operate from 2.375 V to 5.5 V, allowing 3.3 V/5 V, 5 V/3.3 V, or other combinations within spec. Electrical characteristics-including VOH (VDDx – 0.4 V min) and VOL (0.4 V max)-are guaranteed across this range. This flexibility enables SI8660BB-B-IUR to interface between 3.3 V microcontrollers and 5 V analog subsystems without level shifters, preserving signal integrity and reducing BOM count.

How does the RF-based isolation architecture of SI8660BB-B-IUR differ from optocoupler or capacitive isolators?

SI8660BB-B-IUR uses RF on/off keying across a monolithic silicon dioxide barrier-eliminating LED aging, temperature drift, and CMTI limitations of optocouplers, and avoiding charge injection and ESD sensitivity issues of older capacitive isolators. Its architecture achieves 50 kV/µs CMTI, 60-year lifetime at rated voltage, and stable 8 ns propagation delay across –40 to 125 °C. Unlike optocouplers, SI8660BB-B-IUR requires no startup initialization and draws less than half the power of comparable opto-isolators at 100 Mbps.

SI8660BB-B-IUR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 6

Inputs - Side 1/Side 2:: 6/0

Channel Type:: Unidirectional

Voltage - Isolation:: 2500Vrms

Common Mode Transient Immunity (Min):: 50kV/µs

Data Rate:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 13ns, 13ns

Pulse Width Distortion (Max):: 4.5ns

Rise / Fall Time (Typ):: 4ns, 4ns

Voltage - Supply:: 2.5V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

SI8660BB-B-IUR FAQ

1.How can I place an order for SI8660BB-B-IUR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8660BB-B-IUR 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 SI8660BB-B-IUR reliable?

The price and inventory of SI8660BB-B-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8660BB-B-IUR is usually 5 days.

3.What payment methods are accepted for SI8660BB-B-IUR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8660BB-B-IUR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8660BB-B-IUR?

SI8660BB-B-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8660BB-B-IUR 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 SI8660BB-B-IUR?

For technical support, including SI8660BB-B-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8660BB-B-IUR requirements.

6.How does Aetrix verify that SI8660BB-B-IUR is sourced from the original manufacturer or authorized distributors?

All SI8660BB-B-IUR 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 SI8660BB-B-IUR meets industry standards.

7.What is the process for return or replacement of SI8660BB-B-IUR?

All SI8660BB-B-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8660BB-B-IUR, 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 SI8660BB-B-IUR part is unused and in its original packaging.

Return procedure for SI8660BB-B-IUR:

1.Submit a request within 90 days.

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

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