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SI8422BB-D-IS - 2.5 kV 2-Channel Digital Isolator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8422BB-D-IS is a 2-channel CMOS digital isolator rated to 2.5 kV RMS with 1 forward and 1 reverse channel, supporting data rates up to 150 Mbps and worst-case propagation delays of less than 10 ns in an 8-pin narrow-body SOIC package. What is a digital isolator? A digital isolator is a semiconductor device that transfers logic-level signals across an galvanically isolated barrier using high-frequency RF coupling, capacitive coupling, or giant-magnetoresistance (GMR), replacing legacy optocouplers. The Si84xx family belongs to the digital isolator category, which itself is part of interface ICs in power management and signal-chain hierarchies. Unlike optocouplers, Si84xx parts use CMOS differential signaling and offer 10x faster propagation, 10x lower power, and superior CMTI. Key features: the SI8422BB-D-IS integrates Skyworks' proprietary RF-coupled isolation technology with on-chip 2.5 kV RMS isolation, 20 kV/µs typical common-mode transient immunity (CMTI), and 2.70 V to 5.5 V wide supply operation on both sides. The device is fail-safe selectable (default low or default high) to control output state during input power loss, and operates across the -40 °C to +125 °C industrial temperature range. The 8-SOIC narrow-body footprint enables drop-in optocoupler replacement on existing PCB designs. Architecturally, the Si8422 employs an RF carrier modulated by the input data on each side, demodulated across an integrated isolation barrier, then reconstructed at the destination. Both transmitter and receiver sides are independently powered (VDD and VISO rails), providing full galvanic isolation for SPI, I2C, GPIO, or general-purpose logic isolation in industrial bus applications. The CMOS architecture eliminates the LED aging and current-transfer-ratio drift inherent to optocouplers. Typical applications include isolated SPI between MCU and motor-driver gate driver, isolated UART/RS-485 transceivers, industrial field-bus interfaces, isolated gate-drive bias for SiC/IGBT half-bridges, and automotive CAN-FD isolation. The Si8422BB-D-IS is also AEC-Q100 qualified per the manufacturer's data sheet, making it suitable for automotive powertrain and BMS use cases. Design consideration: place 0.1 µF bypass capacitors close to both VDD and VISO pins, and ensure that input and output channels are referenced to their respective grounds (GND1 and GND2) - never tie these grounds together at the IC. Per Skyworks' data sheet, the Si8422BB-D-IS shares the Si8410/Si8420/Si8421 8-SOIC footprint, simplifying PCB reuse across channel-count variants. This page synthesizes drop-in alternatives (Si8422 family variants and TI ISO7221x/ISO7721x pin-compatible parts), distributor pricing as of 2026-10-06, and practical design notes not found in the manufacturer's data sheet.
SI8423AD-D-IS - 2-Channel Digital Isolator, 5kV, 1Mbps | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8423AD-D-IS is a dual-channel digital isolator with 5000 Vrms galvanic isolation, two unidirectional isolation channels (both forward, no reverse channel), 1 Mbps NRZ data rate, and 20 kV/µs minimum common-mode transient immunity (CMTI), housed in a 16-pin wide-body SOIC (0.295" / 7.50 mm) package. A digital isolator is a semiconductor device that uses high-voltage capacitive or magnetic coupling (rather than optocoupling) to transmit logic-level signals across an isolation barrier while blocking DC and low-frequency transients up to thousands of volts. In the modern electronics taxonomy, a digital isolator sits within the broader interface IC family (interface IC -> isolation technology -> capacitive coupling -> digital isolator), and the SI8423AD-D-IS is one of the lowest-cost, narrow-bandwidth members of the Si842x capacitive-isolation family used wherever signal integrity across an isolation barrier is required. Key features include a wide 2.7 V to 5.5 V supply range on both sides (allowing level translation between 3.3 V and 5 V domains), 35 ns maximum propagation delay (tPHL/tPLH), 1.5 ns typical pulse-width distortion, 0.5 ns channel-to-channel skew, and 2 ns propagation delay skew across parts. The device operates over -40 °C to +125 °C, supports a 5 ns minimum pulse width, and is qualified to AEC-Q100 for automotive system designs. RoHS-compliant wide-body SOIC-16 and narrow-body SOIC-8 packages are available within the family. Internally, the Si842x family uses Skyworks' proprietary CMOS-based capacitive isolation technology, where high-voltage capacitors on either side of a SiO2 dielectric barrier modulate an RF carrier to transmit data. Unlike older optocoupler designs, this architecture eliminates LED aging, current-transfer-ratio (CTR) degradation, and slow propagation delays while delivering deterministic 35 ns timing suitable for SPI, I2C, GPIO, and discrete digital control across isolation. Typical applications include isolated SPI interfaces between a microcontroller and a power-converter gate driver, isolated GPIO in industrial PLC and motor-drive systems, isolated UART links in medical and energy-metering equipment, and digital control signal isolation in battery-management and renewable-energy inverter systems. The wide-body SOIC package provides the 8 mm creepage/clearance required for reinforced insulation to IEC 60747-17 / IEC 62368-1 in 230 V mains-connected equipment. When designing with this isolator, derate the isolation voltage per application requirements (5 kVrms is the basic isolation rating; reinforced insulation uses 250 Vrms working voltage). Provide 0.1 µF + 1 µF bypass caps on both VDD pins placed within 2 mm of the IC pins, and treat the two ground domains (VDD1 GND1 and VDD2 GND2) as completely separate returns connected only at the application PCB ground-plane stitch point. This page combines manufacturer datasheet specifications, current distributor pricing, verified drop-in alternatives within the Si842x family, and practical PCB-layout design notes that go beyond what the datasheet alone provides.
SI8600AB-B-IS - Bidirectional I2C Digital Isolator | Skyworks
The Skyworks SI8600AB-B-IS is a bidirectional I2C digital isolator with 2500 Vrms isolation, two channels, and 35 kV/µs common-mode transient immunity (CMTI), housed in an 8-pin SOIC (3.90 mm body width) package. It supports 3 V to 5.5 V supply operation on each side, up to 20 ns propagation delay, and a -40 °C to +125 °C industrial temperature range, with AEC-friendly plastic packaging. The two-wire bidirectional SDA/SCL path is built around Skyworks' proprietary RF-coupled isolation barrier, providing reinforcement insulation at galvanic separation levels associated with industrial field-bus and medical isolated-port designs. What is a digital isolator? A digital isolator is a semiconductor device that transfers logic signals across a galvanic isolation barrier using either RF coupling, magnetic coupling, or optical coupling, while blocking high-voltage transients and ground-potential differences. Digital isolators sit within the broader category of interface ICs (signal conditioning -> isolation -> serial communication) and are commonly used to bridge host controllers with sensors, transceivers, or operator-accessible ports in systems that must meet IEC 60747-17 reinforced-insulation standards. Key features include support for I2C clock-stretching and hot-swap insertion, open-drain buffering on the bidirectional pair, 2.5 V/3.3 V/5 V level translation across the barrier, and unidirectional auxiliary digital channels for side-band signals. The integrated 10-lead-equivalent isolation functionality eliminates the need for discrete photo-couplers and external pull-up coordination circuits in many designs. Internally, the Si8600 family uses an on-chip RF carrier (rather than LED/optocoupler or transformer windings) modulated by input data, recovered on the opposite side, and resynchronized to the local clock. This yields steady propagation delay across temperature and age, low power consumption versus opto-isolators, and a compact 8-SOIC footprint that does not require special creepage/clearance layout beyond standard SMT assembly. Typical applications include isolated I2C buses in industrial PLCs, isolated sensor readouts, hot-swap-capable I/O cards, USB-to-I2C bridges across a high-voltage barrier, and battery-management system (BMS) isolation between low-voltage control and high-voltage cell stacks. When designing with this part, ensure both sides have adequate pull-up resistors to their respective VDD rails (typical 1 kΩ to 10 kΩ depending on bus capacitance), and respect the 560 V peak or 2500 Vrms working voltage limits described in the manufacturer datasheet. Decouple VDD1 and VDD2 with 0.1 µF ceramic capacitors placed within 2 mm of each supply pin. This page synthesizes real-time distributor pricing, drop-in alternatives, datasheet access, and practical design notes not consolidated on the manufacturer product page alone.
SI8600AB-B-ISR - 2.5kV I2C Digital Isolator, 8-SOIC | Skyworks/Silicon Labs
The Silicon Labs (now Skyworks) SI8600AB-B-ISR is a bidirectional I2C digital isolator providing 2500 Vrms galvanic isolation between two bidirectional serial channels, housed in an 8-pin SOIC (0.154 inch / 3.90 mm width) package with 35 kV/µs typical common-mode transient immunity (CMTI). It is specified for 3 V to 5.5 V operation on both sides and supports bidirectional SDA and SCL isolation up to 1.7 MHz using proprietary RF-coupled isolation technology. A digital isolator is a semiconductor device that transmits data across an electrical isolation barrier using capacitive, magnetic, or RF coupling instead of optocouplers. Compared to optocouplers, RF-coupled isolators such as the SI8600 deliver faster propagation delay (typically 20 ns), dramatically lower power consumption, and stable parametric behavior over temperature and aging. Digital isolators are the modern building block of functional-isolation signal chains in industrial I2C buses, where they break ground loops while preserving bidirectional handshake semantics. Key features include two bidirectional channels with open-drain, 35 mA sink capability, hot-swap tolerant inputs that tolerate bus contention during plug-in, clock-stretching support, and Schmitt-triggered inputs with typical 20 ns propagation delay. The 8-SOIC package footprint is the industry-standard digital-isolator outline, and the device requires no external clock or configuration components. Internally the SI8600AB-B-ISR uses Silicon Labs' proprietary RF isolation technology, transmitting edge transitions across a polyimide insulation region using an on-chip RF carrier. This topology yields >25 years of insulation lifetime at rated working voltage, deterministic propagation delay, and >50 kV/µs transient immunity that exceeds optocoupler performance by an order of magnitude. Typical applications include isolated I2C bus interfaces between a microcontroller and a sensor front-end, hot-swappable I2C peripherals in telecom equipment, SMBus isolation in server backplanes, industrial I/O modules with functional isolation, and any 4-wire bidirectional I2C/SMBus link requiring reinforced safety isolation. A key design consideration is that both sides of the SI8600AB-B-ISR require their own bypass capacitor (typically 0.1 µF ceramic close to VDD pins) and pull-up resistors sized for the chosen I2C speed. The device supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode-plus (1 MHz) I2C; for 1.7 MHz operation consult the datasheet. This page consolidates distributor pricing, drop-in alternatives including the TI ISO1640 pin-to-pin replacement, and practical PCB and hot-swap design notes that go beyond the manufacturer datasheet narrative.
SI8610BC-B-IS - 1-Channel 150Mbps Digital Isolator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8610BC-B-IS is a 1-channel ultra-low-power CMOS digital isolator rated at 3750 Vrms isolation, supporting data rates from DC up to 150 Mbps in an 8-pin SOIC narrow-body package. It delivers 8 ns typical propagation delay, 35 kV/us common-mode transient immunity (CMTI), and operates from a wide 2.5 V to 5.5 V supply on both sides of the isolation barrier. A digital isolator is a semiconductor device that transfers logic-level signals across a galvanically isolated barrier using high-frequency capacitive or magnetic coupling instead of an optocoupler's LED + phototransistor chain. Within the broader semiconductor taxonomy, the SI8610BC-B-IS sits under Isolators -> Digital Isolators -> Interface ICs. Compared to legacy optocouplers, capacitive CMOS isolators offer higher data rate, lower propagation delay skew, no LED aging, no CTR (current transfer ratio) drift, and an order-of-magnitude lower quiescent current, while sharing the same JEDEC SOIC footprint so existing optocoupler PCB land patterns can often be reused. Key features include no start-up initialization required, Schmitt-trigger inputs with 25 ns typical pulse-width distortion, and 60-year continuous rated-life isolation barrier per VDE 0884-10 / IEC 60747-17 testing. The -B suffix denotes an updated silicon revision that the manufacturer uses to track minor parametric improvements within the same datasheet family. The Si8610x family uses Skyworks' proprietary capacitive isolation technology with on-off-keying (OOK) modulation and an integrated differential receiver. This architecture eliminates the need for an external transformer or RF carrier, so the device behaves as a logic buffer with an isolation barrier embedded in the package - the only external BOM is a 0.1 uF VDD bypass capacitor on each side and, where required, a logic-side output pull-up resistor. Typical applications include isolated SPI / RS-232 / RS-485 links, industrial 4-20 mA loop isolation, I/O isolation on PLC and motor-drive boards, isolated gate-drive signaling, and isolated UART links between microcontrollers and high-voltage domains in solar inverters, EV chargers, and medical equipment. Designers pick this part when 3.75 kVrms isolation, 150 Mbps speed, and 8-SOIC simplicity matter more than reinforced 5 kV isolation or >25 Mbps edge placement accuracy. When designing in, observe creepage and clearance per IEC 60664-1 for the SOIC-8 footprint - reinforced insulation requires 8 mm minimum and may force a wider-body package. Decouple VDD1 and VDD2 independently with low-ESL 0.1 uF ceramics placed within 2 mm of the supply pins, and avoid routing high-dV/dt traces under the package body to preserve the 35 kV/us CMTI margin. This page synthesizes distributor pricing, drop-in Skyworks/Silicon Labs family alternatives, cross-brand pin-compatible equivalents, and practical design notes not found in a single datasheet.
SI8621EC-B-ISR - 2-Channel Digital Isolator, 3.75 kV, 150 Mbps | Skyworks
The Skyworks (formerly Silicon Labs) SI8621EC-B-ISR is a dual-channel CMOS digital isolator rated for 3750 Vrms isolation with a 150 Mbps data rate and a 35 kV/µs common-mode transient immunity (CMTI), housed in an 8-pin SOIC (3.90 mm width) wide-body package. The EC product family variant offers an industry-standard pinout with two unidirectional channels that can be configured as one forward and one reverse direction. A digital isolator is a semiconductor device that transfers logic signals across an isolation barrier using high-voltage capacitive or magnetic coupling instead of optical coupling. The Si86xx family belongs to the power management and signal-isolation hierarchy: digital isolator -> galvanic isolator -> signal conditioning IC -> interface IC. Replacing legacy opto-couplers, CMOS digital isolators deliver higher speed, tighter propagation-delay matching, lower power consumption, better CMTI, and longer service life — all critical in industrial and automotive systems. Key features include 150 Mbps NRZ signaling with < 10 ns typical propagation delay, ±100 kV/µs transient immunity, 60-year minimum isolation barrier life at rated working voltage, 1.5 mA per-channel quiescent current at 1 Mbps, and wide -40 °C to +125 °C operating temperature. The wide-body SOIC-8 (3.9 mm creepage) provides the 3750 Vrms reinforced isolation needed for reinforced IEC 60747-17 / UL 1577 compliant designs. The Si8621EC uses Skyworks' proprietary RF-coupled CMOS isolation architecture: an on-chip encoder converts the DC input into a short RF carrier, the RF carrier is coupled across a high-voltage capacitive barrier, and an integrated PLL/buffer reconstructs the DC output. Unlike optocouplers, this approach has no LED degradation, no current-transfer-ratio (CTR) aging, and stable timing across temperature. Typical applications include isolated SPI / I²C / RS-485 / RS-232 interfaces in industrial PLCs, motor-drive gate-driver signal isolation in 3-phase inverters, isolated UART channels between MCU and ground domains, battery-management system (BMS) communication isolation in EV traction packs, and digital-isolation barriers in solar inverters and telecom DC-DC modules. When designing with this device, place 0.1 µF decoupling capacitors on both VDD1 and VDD2 as close to the IC pins as possible and ensure the SOIC-8 wide-body footprint maintains ≥ 3.9 mm of package-side creepage. The default channel direction (one forward, one reverse) eliminates external glue logic for full-duplex protocols. This page synthesizes Skyworks (Silicon Labs) datasheet specifications, real-time distributor pricing across DigiKey/Mouser/LCSC, drop-in same-package alternatives from the Si86xx family, and practical PCB design notes that go beyond the manufacturer datasheet.
SI8630AB-B-IS - 3-Ch 2.5kV Digital Isolator 1Mbps SOIC-16
The Skyworks Solutions (formerly Silicon Labs) SI8630AB-B-IS is a 3-channel, 2.5 kVrms general-purpose CMOS digital isolator in a 16-pin wide-body SOIC package, supporting data transmission up to 1 Mbps with 35 kV/us minimum common-mode transient immunity (CMTI). It operates from 2.70 V to 5.5 V on both sides of the isolation barrier and consumes less than 1.6 mA per channel at 1 Mbps with a 5 V supply. What is a digital isolator? A digital isolator is a semiconductor device that transfers logic signals across a galvanically isolated barrier, replacing optocouplers in most modern designs. The Si86xx family uses Skyworks' proprietary RF-coupled isolation technology (capacitive or transformer-based) to break ground loops, reject common-mode transients, and protect low-voltage circuitry from high-voltage domains. Within the signal-chain taxonomy, a digital isolator belongs to interface ICs and typically sits between a controller and a power stage, sensor front end, or communication transceiver. Key features of the SI8630AB-B-IS include 2500 Vrms isolation rating per UL 1577, 3 forward and 0 reverse channels (channel count: 3/0), wide 2.70-5.5 V supply on both sides, propagation delay around 35 ns typical, and -40 C to +125 C operating temperature range. The wide-body SOIC-16 (7.50 mm) package provides the reinforced creepage and clearance required for 2.5 kV safety isolation while staying drop-in compatible with other Si86xx 16-pin SOIC members. Architecturally, the device uses an RF carrier modulation scheme across an internal isolation barrier combined with differential receivers on each side; no start-up initialization is required and the parameters remain stable across temperature and device lifetime. Compared to optocouplers, the Si86xx family eliminates the LED aging problem, removes the need for refresh pulses, and provides tighter channel-to-channel matching. Compared to gate-driver isolators in the same family, the SI8630 is a general-purpose logic isolator with no integrated driver outputs. Typical applications include isolated SPI/UART interfaces between a low-voltage MCU and a 24 V industrial PLC backplane, isolated gate-drive logic signals for solar inverters, isolated analog-front-end IO between motor controllers and microcontroller, isolated I2C or RS-485 bus segments, medical equipment signal isolation, and industrial field-bus isolation in 4-20 mA loops. When designing with the SI8630AB-B-IS, place 0.1 uF bypass capacitors close to each VDD pin on both sides of the barrier and add bulk capacitance if the upstream supply is shared with switching nodes. For 2.5 kVrms reinforced isolation, follow the wide-body SOIC PCB creepage and clearance guidelines (typically 8 mm minimum). The device has no enable pin - all channels are active whenever bias is present. This page synthesizes distributor pricing, drop-in alternatives, and practical PCB design notes drawn from the Skyworks Si86xx 1 Mbps datasheet family that are not consolidated in any single manufacturer document.
SI8630AB-B-IS1 - 3-Channel 2.5kV Digital Isolator, 1Mbps | Skyworks
The Skyworks SI8630AB-B-IS1 is a low-power, triple-channel CMOS digital isolator rated at 2500 Vrms isolation voltage and supporting 1 Mbps data rate across three unidirectional channels, housed in a 16-pin wide-body SOIC (SOIC-W) package. A digital isolator is an integrated circuit that transfers data across an isolation barrier using capacitive or inductive coupling rather than optical or transformer-based methods, enabling signal-level translation between two galvanically isolated grounds while protecting low-voltage logic from high-voltage transients. The SI8630AB-B-IS1 sits within the broader category of digital isolators (isolation ICs > interface ICs > power management and signaling), providing reinforced insulation for industrial, medical, and renewable-energy systems. Key specifications include 2500 Vrms isolation (UL1577-rated), 35 kV/µs common-mode transient immunity (CMTI), 35 ns typical propagation delay, and 2.5 V to 5.5 V supply on both sides. The device supports bidirectional operation only via external DC-blocking components and operates from a 2.5 V to 5.5 V supply. It provides three forward channels (3/0 direction), making it well suited for unidirectional digital signaling such as gate-drive interfaces, SPI isolation, or RS-485 transceiver-to-MCU links. The wide-body SOIC package provides 8 mm creepage and clearance, which is essential for end-system certifications. Architecturally, the SI8630AB-B-IS1 uses Skyworks' proprietary CMOS-based isolation technology with on-chip RF carrier modulation across a 1.6 µm polyimide dielectric. This achieves higher CMTI (35 kV/µs) and lower power consumption than legacy optocouplers. The internal oscillator-driven architecture requires no external clock, simplifying design-in. Typical applications include isolated SPI interfaces, industrial fieldbus (RS-485, CAN) isolation, gate driver signal isolation for motor drives and solar inverters, isolated ADC/DAC front ends, and medical-device patient-isolation barriers. The wide 2.5 V to 5.5 V supply range also permits direct connection to 3.3 V and 5 V MCUs without level shifters. When designing with the SI8630AB-B-IS1, pay attention to bypass capacitor placement - 0.1 µF X7R ceramics on each VDD pin placed within 2 mm of the leads are required for the rated CMTI performance. The wide-body SOIC package provides the required 8 mm creepage for reinforced insulation per IEC 60747-17; board layout should not route any copper underneath the package body to preserve this clearance. This page synthesizes distributor pricing from DigiKey/Mouser/Octopart, drop-in alternatives in the same 16-SOIC footprint, and practical design notes covering CMTI, creepage, and bypass placement not duplicated from the Skyworks datasheet.
SI8640BA-B-IU - 4-Ch 2.5kV Digital Isolator, 150Mbps | SSOP-16
The Skyworks (formerly Silicon Labs) SI8640BA-B-IU is a low-power, quad-channel CMOS digital isolator rated at 2500 Vrms with four unidirectional channels, 150 Mbps data rate, 8 ns propagation delay, and 35 kV/µs common-mode transient immunity (CMTI) in a 16-pin SSOP (3.90 mm body width) package. It is qualified for an industrial operating temperature range of -40 °C to +125 °C and operates from a 2.375 V to 5.5 V supply on each side of the isolation barrier. A digital isolator is a semiconductor device that transfers logic signals across an galvanically isolated barrier using an internal RF carrier, capacitive coupling, or giant-magnetoresistance (GMR) link rather than optocoupler-style optical coupling. Digital isolators sit in the signal-isolation hierarchy between optocouplers and transformer-based isolated data interfaces, offering higher speed, lower power, better CMTI performance, and longer service-life reliability. They are widely adopted to satisfy IEC 60747-5/VDE 0884-style reinforced isolation in industrial, automotive, and renewable-energy systems. Key features include four unidirectional channels (3 forward / 1 reverse on the 'BA' channel-direction suffix), 60-year minimum isolation barrier life, ±200 kV/µs surge withstand capability, Schmitt-trigger inputs with 1.5 ns typical jitter, low EMI, and default low output states. The wide 2.375 V to 5.5 V supply range allows direct level shifting between 3.3 V and 5 V domains across the isolation barrier without additional components. The SI8640BA-B-IU employs Skyworks' proprietary RF-coupled CMOS isolation architecture, in which an on-chip RF carrier is modulated by the input data, coupled across an internal SiO2 dielectric barrier, and demodulated on the far side. This architecture delivers stable operating parameters over temperature and device lifetime, eliminating the CTR-degradation issues that plague optocouplers in long-life industrial applications. Typical applications include isolated SPI / UART / GPIO interfaces in industrial PLCs, isolated gate-driver signal paths for solar inverters and motor drives, isolated ADC/DAC digital interfaces in medical instrumentation, and battery-management isolation in 400 V / 800 V electric-vehicle traction systems. When designing with this device, place 0.1 µF bypass capacitors close to each VDD pin and verify that the VDE 0884-11 / IEC 60747-17 reinforced-insulation creepage and clearance on the PCB meet the 2.5 kVrms working-voltage requirement for the target end system. This page synthesizes distributor pricing, drop-in alternatives sourced from authorized cross-reference data, and practical design notes not found in the Skyworks / Silicon Labs datasheet alone.
SI8640BD-B-IS - 4-Ch 5kV Digital Isolator, 150Mbps | Skyworks
The Skyworks (formerly Silicon Labs) SI8640BD-B-IS is a low-power, quad-channel CMOS digital isolator rated at 5000 Vrms with up to 150 Mbps data rate, housed in a 16-pin wide-body SOIC (WSOIC-16, 0.295" / 7.50 mm) package. It uses Skyworks' proprietary RF-coupled isolation technology to deliver four unidirectional channels with a propagation delay of 8 ns typical and 35 kV/us minimum common-mode transient immunity (CMTI). A digital isolator is an interface IC that transfers logic signals between two domains at very different voltage potentials while blocking DC and low-frequency currents. By replacing optocouplers, digital isolators eliminate the slow LED degradation, current-consumption penalties, and bulky footprints that limit legacy optocoupler designs. Digital isolators sit within the broader hierarchy of galvanic isolation components - between basic optocouplers and fully integrated isolated gate drivers / isolated ADC front-ends - and they are a foundational building block inside industrial PLCs, motor drives, solar inverters, and medical equipment. Key specifications include 2.5 V to 5.5 V supply range on each side, 1.8 V logic compatibility with proper level shifting, 35 kV/us minimum CMTI, 60-year minimum insulation barrier life, and 8 ns typical propagation delay. The wide-body SOIC package provides the 8 mm creepage required for reinforced insulation at 5000 Vrms working voltage, and supports PCB layouts that survive 8 kV surge and 1.2 kV ring-wave tests per IEC 60700-equivalent methods. The Si864x architecture pairs an RF carrier on the input side with a differential coil structure etched inside the package, with a second demodulator on the output side. The four channels share a single isolation barrier which trims die cost versus per-channel optocouplers. All four channels are unidirectional in the same direction (4/0 forward configuration), making this part the natural choice when four logic signals all need to cross from one side to the other. Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), motor control gate-drive signal isolation, solar inverter power-conversion feedback, medical equipment patient-isolation barriers, and PLC analog/digital I/O modules. It is also a strong fit for any system requiring reinforced 5 kV isolation per IEC 60747-17 (V) or equivalent standards. When designing with this part, place 0.1 uF decoupling capacitors on both VDD1 and VDD2 within 2 mm of the supply pins and avoid routing signal traces or copper pours directly under the body of the WSOIC package - any stray capacitance under the coil structure will degrade CMTI performance. Confirm that downstream production code lines will accept the propagation delay above 0.5 ns. This page synthesizes distributor pricing, drop-in alternatives from Skyworks and competitor families, and practical design notes not consolidated in the manufacturer datasheet, helping engineers select and qualify the SI8640BD-B-IS with confidence.
SI8641AB-B-IS1 - 4-Ch 1Mbps 2.5kV Digital Isolator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8641AB-B-IS1 is a low-power quad-channel CMOS digital isolator rated at 2500 Vrms isolation, supporting 1 Mbps data rate across four unidirectional channels with 35 kV/µs common-mode transient immunity (CMTI), housed in a 16-pin SOIC (3.90 mm body width) package. It targets general-purpose galvanic isolation between circuit domains where signal integrity, low propagation delay, and robust transient immunity are required. A digital isolator is a semiconductor device that transfers logic signals across a galvanic isolation barrier using high-voltage capacitors, RF coupling, or GMR/micro-transformers instead of optocouplers' LED/photodiode pairs. Compared with traditional optocouplers, CMOS digital isolators deliver higher speed, tighter channel-to-channel skew, lower power consumption, and better DC accuracy. Within the broader signal-chain hierarchy, the SI8641AB-B-IS1 belongs to the digital isolator family, which itself is a sub-category of interface ICs, which in turn are part of the broader integrated circuits category used for inter-domain communication in mixed-voltage systems. Key features include four unidirectional channels configured as 3 forward / 1 reverse (per the 'B' channel-direction suffix), 35 ns typical propagation delay, 1 Mbps guaranteed data rate, 2.5 V to 5.5 V wide VDD supply range, and 35 kV/µs minimum CMTI. The CMOS architecture eliminates the high-current LED drive required by optocouplers, reducing quiescent current per channel and improving long-term reliability by removing ageing-sensitive emitters. The 2500 Vrms isolation rating satisfies reinforced-insulation requirements for many industrial control, factory automation, and renewable-energy applications. The device uses Skyworks' standard Si86xx capacitive-isolation core, which transmits data across the high-voltage domain by encoding edge transitions as RF carrier bursts. This approach yields channel-to-channel skew below 5 ns, deterministic propagation delay, and transient immunity that exceeds typical optocoupler performance by an order of magnitude. An internal refresh pulse keeps the output state valid during long DC idle intervals, supporting protocols with arbitrary duty cycles. Typical applications include isolated SPI/UART interfaces between microcontrollers and high-side gate drivers, isolated gate-drive signal paths for industrial motor drives and solar inverters, isolated data acquisition front-ends, isolated RS-485/RS-232 transceivers, and isolated power-supply feedback paths. The 1 Mbps speed rating suits low- and medium-speed control loops rather than high-speed LVDS or video links. When designing with this part, observe the PCB layout rules in the datasheet: maintain at least 4 mm creepage on the high-voltage side, place 0.1 µF VDD bypass capacitors within 2 mm of each supply pin, and avoid routing traces or copper pours directly beneath the isolation barrier. The 'B' channel configuration (3F/1R) must be matched to your MCU's transmit/receive pin assignment; if you need a different direction split, the SI8640/SI8642/SI8645 family members offer alternative routings in the same SOIC-16 footprint. This page synthesizes current distributor pricing, verified Skyworks-family drop-in alternatives, and practical PCB/EMI design notes that are not bundled together on the manufacturer product page or the distributor catalog listings.
SI8641AB-B-ISR - 2.5kV 4-Ch Digital Isolator, 1Mbps | Skyworks
The Skyworks Solutions SI8641AB-B-ISR is a 4-channel CMOS digital isolator providing 2500 Vrms galvanic isolation with a 1 Mbps data rate and 35 kV/µs common-mode transient immunity (CMTI), housed in a 16-pin wide-body SOIC (0.295", 7.50 mm) package. Per the manufacturer datasheet, this part supports 2.5 V to 5.5 V supply on each side and uses Skyworks' proprietary RF carrier-based isolation architecture to deliver robust signal integrity across the isolation barrier. A digital isolator is a semiconductor device that transmits logic signals across an isolation barrier while blocking high-voltage transients, ground loops, and common-mode noise. Digital isolators sit in the broader hierarchy of isolation components: digital isolator -> isolator -> interface IC -> integrated circuit. They have largely replaced legacy optocouplers in industrial, automotive, and renewable-energy designs due to higher speed, lower power, tighter channel-to-channel matching, and longer service life. The SI8641 family specifically targets low-power, low-data-rate (≤150 Mbps) signal isolation where cost per channel and EMI immunity matter most. Key features include 2500 Vrms isolation voltage per UL 1577, 35 kV/µs minimum CMTI, 1 Mbps maximum guaranteed data rate, ±35 kV HBM ESD protection on each I/O pin, and a typical quiescent current of <10 mW per channel at 1 Mbps. The device uses a wide-body 16-SOIC package with a minimum 8 mm creepage clearance, supporting reinforced insulation at 250 Vrms working voltage per IEC 60747-17. Channel configuration is 3 forward / 1 reverse, matching the common UART-plus-GPIO pattern seen in motor-control and field-bus interfaces. Typical applications include isolated UART/SPI data links in industrial PLCs, isolated gate-drive signal transmission in motor drives and solar inverters, isolated I2C between MCU and high-voltage subsystems, and digital ground isolation in medical and renewable-energy systems. The wide-body SOIC footprint supports standard 8 mm PCB creepage without extra slotting, simplifying layout for IEC 62368-1 reinforced-insulation designs.
SI8641BD-B-ISR - 5kVrms 4-Ch 150Mbps Digital Isolator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8641BD-B-ISR is a quad-channel digital isolator rated at 5000 Vrms isolation with a 150 Mbps data rate, housed in a 16-pin wide-body SOIC (0.295 inch, 7.5 mm width) package. It delivers 35 kV/µs common-mode transient immunity (CMTI) and 8 ns typical propagation delay, making it suitable for high-speed industrial, automotive, and renewable-energy interfaces where galvanic isolation between ground domains is mandatory for safety and noise rejection. What is a digital isolator? A digital isolator is a semiconductor device that transfers logic-level signals across an isolation barrier (typically a high-voltage dielectric or RF-coupled transformer inside the chip) while blocking DC and low-frequency transients between the input and output domains. Digital isolators have largely replaced optocouplers because they offer higher data rates, tighter propagation delay, lower power consumption, better CMTI, and longer operational life. Within the broader power management and interface hierarchy, digital isolators sit beside gate drivers, isolated ADCs, and isolated transceivers as the core isolation primitives used in motor control, solar inverters, EV charging, factory automation, and medical equipment. Key features of the SI8641BD-B-ISR include CMOS-based isolation technology, 2.375 V to 5.5 V supply range on both sides for flexible level translation, default-high or default-low fail-safe output options, and an enable pin for grouped output control. The wide-body SOIC-16 package provides a clearance and creepage distance compliant with reinforced insulation at 5 kVrms per UL 1577 and IEC 60747-17 (VDE 0884-17) requirements. Typical applications include industrial Fieldbus isolation (RS-485, RS-232, CAN, SPI, I2C), solar inverter gate-driver signal isolation, motor-drive control signal interfaces, EV charging-station communication, and PLC I/O isolation. The high CMTI of 35 kV/µs ensures reliable data transmission in noisy switching environments such as SiC and IGBT power stages. When designing with the SI8641BD-B-ISR, place decoupling capacitors (typically 0.1 µF ceramic) as close as possible to each VDD pin, observe PCB layout creepage rules for the 5 kV rating, and confirm that the upstream and downstream supplies can be independently enabled or disabled without violating the device's power-up/power-down sequencing requirements. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, giving procurement teams and design engineers a single decision-ready reference.
SI8641EC-B-IS1 - 4-Ch 3.75 kV Digital Isolator, 150 Mbps | Skyworks
The Skyworks (formerly Silicon Labs) SI8641EC-B-IS1 is a low-power, quad-channel digital isolator that delivers up to 150 Mbps data rates across four independent unidirectional channels with 3.75 kVrms isolation rating, housed in a 16-pin narrow-body SOIC (SOIC-Narrow-16) package. It uses CMOS-based capacitive isolation technology, providing propagation delays below 10 ns, 35 kV/µs common-mode transient immunity (CMTI), and an operating voltage range of 2.5 V to 5.5 V on both sides of the isolation barrier. A digital isolator is a semiconductor device that transfers digital signals across a galvanically isolated barrier using capacitive, inductive, or optical coupling rather than a direct electrical connection. Within the broader product hierarchy, the SI8641EC belongs to the digital isolator family, which itself sits under interface ICs, isolation technology, signal conditioning, and finally power management / signal-chain semiconductors. Digital isolators replace legacy optocouplers in modern designs to achieve faster switching, lower power consumption, tighter timing accuracy, and longer service life. Key features of the SI8641EC-B-IS1 include four unidirectional channels (3 forward, 1 reverse), selectable fail-safe output modes (high or low default during power loss), an output enable pin for centralized output control, and a typical quiescent current of 1.6 mA per channel at 1 Mbps. The device operates across -40 °C to +125 °C and supports both 3.3 V and 5 V logic families. The architecture pairs proprietary CMOS RF carriers with on-chip capacitive isolation cells. An input edge triggers a high-frequency carrier that crosses the isolation barrier through a differential capacitor pair and is reconstructed on the far side by a comparator. This approach eliminates the LED aging and current-transfer-ratio degradation inherent to optocouplers. Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), PLC I/O modules, medical device patient-isolation barriers, isolated gate-drive interfaces, and USB/serial-port isolation. Each application benefits from the 3.75 kVrms reinforced isolation rating that satisfies UL 1577 / IEC 60747-17 requirements. When designing with this device, place 0.1 µF decoupling capacitors on each VDD pin as close to the package as possible, and keep the input/output traces short to preserve the 35 kV/µs CMTI margin. Avoid routing high-dv/dt signals directly beneath the package, because stray coupling can degrade CMTI performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design considerations that go beyond the manufacturer datasheet, giving procurement and design engineers a single source for evaluation, sourcing, and second-source qualification.
SI8642BB-B-IU - 4-Ch 2.5kV Digital Isolator, 150Mbps | Skyworks
The Skyworks Solutions SI8642BB-B-IU is a low-power quad-channel digital isolator supporting four unidirectional data lanes at up to 150 Mbps, housed in a 16-pin QSOP (3.90 mm) narrow-body package. It provides 2500 Vrms galvanic isolation between input and output sides with a common-mode transient immunity of 35 kV/µs, enabling reliable data transfer across high-voltage safety barriers in industrial systems. A digital isolator is a semiconductor device that transmits data or clock signals across an isolation barrier using high-voltage capacitors (capacitive coupling) or transformers (inductive coupling) instead of optocouplers. The quad-channel digital isolator family (digital isolator -> capacitive isolator -> signal isolator -> interface IC -> semiconductor) replaces legacy optocouplers in modern designs, providing faster data rates, lower power consumption, tighter channel-to-channel matching, and integration of multiple channels in one package — advantages that translate to smaller PCB area, predictable propagation delays, and higher CMTI for noisy motor drive or inverter environments. Key specifications include a propagation delay below 10 ns (typical 8 ns per the datasheet), 2.375 V to 5.5 V supply range on both sides, low quiescent current, and DC-correct output behavior so input idle states are mirrored without DC biasing. The device supports fail-safe output states and a per-channel enable control on selected variants. The narrow-body 16-QSOP package keeps creepage and clearance within 2.5 kVrms reinforced-insulation ratings per UL 1577 while saving board space versus SOIC-16 wide-body isolators. The architecture uses Skyworks' proprietary CMOS-based capacitive isolation technology, integrating four isolation channels in a single die with deterministic timing and high CMTI. This capacitive approach avoids the aging, current-transfer-ratio degradation, and slow switching inherent to optocouplers, while consuming far less power and supporting multi-Mbps signaling. Each channel transmits logic transitions via high-voltage capacitors embedded in the die, with on-chip decoding restoring clean logic levels at the output. Typical applications include isolated SPI/UART interfaces in PLCs, isolated gate-drive signal interfaces in motor-control power stages, isolated serial communication links in solar inverters, isolated digital I/O modules in industrial automation, and isolated data-acquisition channels in medical and energy-metering systems. The wide 2.375 V – 5.5 V supply range makes the device compatible with both 3.3 V microcontrollers and legacy 5 V logic. When using the SI8642BB-B-IU, observe the PCB layout recommendations in the datasheet for creepage and clearance to maintain 2.5 kVrms rating: place the device so its body spans the high-voltage isolation barrier, and avoid copper traces and vias under the QSOP package between input and output ground islands. Decouple each VDD pin with a 0.1 µF low-ESL ceramic capacitor placed within 2 mm of the pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
SI8645BA-B-IU - 4-Ch 1kV Digital Isolator, 150Mbps | Skyworks
The Skyworks SI8645BA-B-IU is a low-power, quad-channel CMOS digital isolator rated for 1000 Vrms isolation with 4 forward-direction channels, 150 Mbps data rate, 35 kV/µs common-mode transient immunity (CMTI), and a maximum propagation delay of 8 ns, housed in a 16-pin QSOP (SSOP 0.154", 3.90 mm width) package. Designed as a general-purpose digital isolator, it provides substantial data rate, propagation delay, power, and BOM advantages over legacy optocoupler-based isolation. A digital isolator is a semiconductor device that transfers logic-level signals across an isolation barrier using capacitive, inductive (transformer), or giant-magnetoresistive (GMR) coupling while blocking DC and high-voltage transients. Digital isolators sit within the broader hierarchy of interface ICs > isolators > signal-conditioning ICs > integrated circuits. They replace legacy optocouplers in applications that need high speed, low power, high CMTI, and stable performance over temperature and device lifetime. Key features of the SI8645BA-B-IU include four unidirectional channels with the same input/output direction (4/0 channel configuration, BA variant), 2.5 V to 5.5 V wide VDD range on both sides for level translation, low power consumption typical of Skyworks' Si86xx family, and 8 ns maximum propagation delay. The CMOS-based isolation barrier delivers stable operating parameters across wide temperature ranges and throughout device service life, easing design-in and yielding highly uniform performance. The device uses Skyworks' proprietary CMOS isolation technology with on-chip capacitive isolation barriers, providing robust rejection of common-mode transients up to 35 kV/µs. This makes it suitable for noisy industrial environments where fast switching transients can corrupt data transmission across the isolation barrier. Typical applications include isolated SPI/UART interfaces between microcontrollers and peripherals, industrial fieldbus isolation (RS-485, CAN, Profibus), isolated gate driver signal paths for power converters, and battery management isolation in lithium-ion battery packs. The 4-channel, same-direction configuration is particularly useful when the designer needs to transmit four parallel control or data signals across the isolation barrier. When designing with this part, ensure that decoupling capacitors are placed close to each VDD pin and that the PCB layout provides adequate creepage and clearance per the application's safety standard (e.g., IEC 60747-17, UL 1577). For best CMTI performance, keep the isolation barrier free of nearby high-dV/dt traces and provide a solid ground return on each side. This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes not found in the standalone manufacturer datasheet, giving procurement and design engineers a single reference for sourcing the SI8645BA-B-IU.
SI8645BA-B-IUR - 4-Ch 1kVrms Digital Isolator, 150Mbps | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI8645BA-B-IUR is a 4-channel general-purpose CMOS digital isolator rated at 1 kVrms withstanding isolation, supporting 150 Mbps data rate and 35 kV/µs common-mode transient immunity (CMTI). It is delivered in a 16-pin QSOP (SSOP-equivalent, 0.154" / 3.90 mm body width) package supplied on tape-and-reel (2500-piece reel). The "-IUR" suffix denotes the industrial temperature grade (-40°C to +125°C) and tape-and-reel packaging. A digital isolator is a semiconductor device that transfers data across an galvanically-isolated barrier using high-frequency CMOS signaling through on-chip transformers or capacitive barriers instead of optocouplers' LED-phototransistor links. Compared to legacy optocouplers, CMOS digital isolators deliver up to 10x faster data rates, 5x lower power consumption, tighter channel-to-channel timing skew, and superior CMTI. Within the signal-chain hierarchy, the SI8645 sits under: digital isolator -> isolation IC -> interface IC -> integrated circuit. Key features include headroom: 2.5 V to 5.5 V wide-side supply range on both sides of the barrier (allowing level translation between 3.3 V and 5 V domains), default-high fail-safe output state that drives the output logic-high if the input side loses power, Schmitt-trigger inputs for slow/noisy edges, and a propagation delay of approximately 10 ns typical with sub-ns skew. The part integrates four unidirectional isolation channels configured per the "BA" pinout ordering. Architecturally, the SI8645 uses Skyworks' proprietary CMOS isolation technology with on-chip RF carriers and miniature transformers, achieving 1 kVrms isolation in a sub-2 mm-tall QSOP-16 package. Typical power consumption is below 6 mW per channel at 150 Mbps, an order-of-magnitude improvement over optocouplers at the same throughput. Typical applications include industrial field-bus isolation (RS-485, RS-232, CAN, SPI), microcontroller I/O isolation, isolated ADC/DAC signal paths, motor-control gate-driver signal isolation, and isolated power-supply feedback paths. The wide 2.5-5.5 V supply on both sides lets it bridge logic domains without extra level-shifters. When designing with this part, observe the layout guidance from the datasheet: route the isolated ground returns directly under the IC, place bypass capacitors on each VDD pin within 2 mm, and keep data traces matched to avoid skew. The fail-safe default-high output must be considered in any system where loss of input power must NOT cause a false enable signal on the isolated side. This page consolidates distributor pricing, drop-in alternatives, and PCB-layout guidance not found in the manufacturer datasheet, providing engineers a faster path to a drop-in design decision.
SI8660BB-B-IS1 - 6-Ch 2.5kV Digital Isolator, 150Mbps | Skyworks
The Skyworks Solutions SI8660BB-B-IS1 is a low-power six-channel CMOS digital isolator rated at 2500 Vrms isolation with 150 Mbps data rate, housed in a 16-pin narrow-body SOIC (NSOIC) package. It uses Skyworks' proprietary RF-based CMOS isolation technology, providing six independent isolation channels in a single IC with 35 kV/µs minimum common-mode transient immunity (CMTI) and 8 ns typical propagation delay. The supply range is 2.375 V to 5.5 V on both VDDA and VDDB sides, supporting direct interfacing to low-voltage MCUs as well as legacy 5 V logic without level shifters. A digital isolator is an integrated circuit that transfers logic signals across a galvanically isolated barrier using an internal high-frequency carrier (RF, magnetic, or optical) instead of optocouplers' slow LED-phototransistor path. It belongs to the hierarchy signal isolator -> isolator -> interface IC -> semiconductor. Compared to optocouplers, CMOS digital isolators deliver 10x to 100x faster data rates, 5x to 10x lower propagation delay, lower power consumption, tighter timing specifications, and better stability over temperature and device lifetime, while also eliminating the aging and CTR degradation inherent to LED-based isolators. Key features include a fail-safe output (output default-high when input is unpowered), integrated power-on reset, 50 kV/µs transient immunity, 1.5 ns typical channel-to-channel skew, and 50 kV/µs ESD performance on the bus pins. The device supports 2.5 V, 3.3 V, and 5 V logic on each side independently, making it a flexible general-purpose isolator for SPI, I2C, GPIO, RS-485, and digital feedback paths. Architecturally, the Si866x family uses an on-chip RF carrier modulated by the input data, transmitted across a high-voltage differential capacitive or transformer isolation barrier, then demodulated and re-timed on the secondary side. The internal oscillator and dual supply domains are referenced to separate grounds, enabling full galvanic isolation up to the rated working voltage. The six channels of the SI8660BB variant are partitioned as 0 forward / 6 reverse, suitable for uni-directional multi-channel signal return paths. Typical applications include industrial fieldbus isolation (RS-485, CAN, Profibus), PLC and DCS I/O modules, isolated SPI/I2C interfaces between microcontrollers and ADCs, isolated gate-drive feedback in motor drives and solar inverters, isolated USB and Ethernet signal paths, and medical equipment patient-isolation barriers. The wide temperature range of -40°C to +125°C supports industrial and automotive-grade designs. Design tip: place 0.1 µF bypass capacitors within 2 mm of each VDDA/VDDB pin and avoid routing high-speed traces directly under the SOIC body to minimize coupling to the ground plane. The default-high fail-safe output eliminates external pull resistors on the secondary side. This page consolidates real-time distributor pricing, drop-in alternatives, design notes, and comparison tables that go beyond what the manufacturer datasheet alone provides for engineers evaluating the SI8660BB-B-IS1.
SI8660BB-B-IS1R - 6-Ch 150Mbps 2.5kV Digital Isolator | Skyworks
The Skyworks (formerly Silicon Labs) SI8660BB-B-IS1R is a low-power six-channel CMOS digital isolator rated for 2.5 kVrms isolation and 150 Mbps data rate, packaged in a 16-pin narrow-body SOIC (0.154" / 3.90 mm width). It uses Skyworks' proprietary RF carrier-based isolation technology to deliver six independent unidirectional isolation channels in a single IC, replacing legacy optocouplers with a fraction of the power consumption and a 35 kV/µs common-mode transient immunity (CMTI). A digital isolator is a semiconductor device that transfers logic signals across an electrical isolation barrier using capacitive, magnetic, or RF coupling, while blocking high voltages, ground loops, and noise transients between two circuit domains. Digital isolators sit hierarchically between optocouplers (older LED-based technology) and integrated isolated gate drivers / isolated data converters (functional blocks with built-in isolation). Within a system, they enable safe communication between a low-voltage controller side (e.g., 3.3 V MCU) and a high-voltage power or field side (e.g., 24 V industrial bus, 400 V traction inverter), forming the safety-critical interface mandated by IEC 60747-17 and UL 1577. Key features of the SI8660BB-B-IS1R include a 2.5 kVrms withstand voltage per UL 1577, a 150 Mbps maximum data rate with low propagation delay, an operating supply range of 2.5 V to 5.5 V on both sides, fail-safe default outputs, and -40 °C to +125 °C industrial temperature support. The device requires no external drivers or clock sources and uses standard CMOS I/O levels, simplifying interface with 3.3 V and 5 V MCUs. Internally the part uses an RF carrier modulated by the input data, coupled across a high-voltage SiO2 isolation barrier through on-chip transformers, then demodulated back to a CMOS output. This architecture avoids the LED aging and current-transfer-ratio degradation inherent to optocouplers, while delivering >25 years of service life and stable parameters over temperature. The narrow-body SOIC-16 footprint matches the popular package outline and pinout shared with the broader Si866x family. Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI between isolated ground domains), solar inverter gate-driver signaling, motor-control feedback isolation, PLC digital-input modules, and isolated SPI/UART links between a host MCU and a high-voltage sensor or power stage. The 150 Mbps capability also suits high-speed signalling such as isolated USB or LVDS bridging. When designing with this device, place 0.1 µF bypass capacitors directly on each VDD pin and keep the trace loop between the two VDD domains short. Note that the narrow-body 16-SOIC offers 2.5 kVrms; for higher isolation grades (5 kVrms), choose the wide-body SOIC variants in the same Si866x family. This page synthesizes Skyworks datasheet specifications, distributor live pricing, same-family Si866x cross references, and practical layout notes not found in the manufacturer datasheet.
SI8661BC-B-IS1R - 6-Ch 3.75 kV 150 Mbps Digital Isolator | Skyworks
The Skyworks (formerly Silicon Labs) SI8661BC-B-IS1R is a low-power six-channel CMOS digital isolator rated at 3750 Vrms isolation with 150 Mbps data rate and 35 kV/us common-mode transient immunity, housed in a 16-pin wide-body SOIC package (0.154 inch / 3.90 mm width). The BC grade offers six forward channels in the same direction, providing galvanic isolation between two voltage domains while supporting high-speed unidirectional signaling such as SPI, GPIO, and parallel data buses. A digital isolator is a semiconductor device that transmits data or clock signals across an isolation barrier using capacitive or inductive coupling instead of optical or electromechanical means. Digital isolators sit in the broader hierarchy of signal isolation components: digital isolator -> isolator -> interface IC -> semiconductor. They replace legacy optocouplers in most modern designs because they offer higher speed, lower power, tighter channel-to-channel matching, and CMOS-compatible inputs/outputs without the aging and CTR degradation inherent to LEDs. Key features of the SI8661BC-B-IS1R include sub-nanosecond channel-to-channel skew, 60 ns typical propagation delay, 50 kV/us minimum CMTI, and 1.5 mA per channel quiescent current at 100 kHz. The device operates from 2.5 V to 5.5 V supplies on both sides of the barrier and supports DC-to-150 Mbps NRZ data. It is AEC-Q100 qualified for automotive applications and carries UL/VDE/CSA safety certifications per IEC 60747-17 / IEC 60747-5-5 for reinforced insulation. The architecture uses Skyworks' proprietary CMOS capacitive coupling with on-chip refresh, eliminating the need for external transformers or LEDs. The wide-body SOIC package provides 8 mm creepage and clearance, supporting reinforced insulation up to 3750 Vrms / 5 kVpeak surge. Internal pull-up resistors simplify external circuitry and reduce BOM count. Typical applications include industrial fieldbus isolation (RS-485, CAN, Profibus), motor drive gate-driver signal isolation, isolated SPI interfaces for ADC/DAC subsystems, solar inverter control loops, and EV battery management isolation. The 150 Mbps rating also supports low-latency digital audio and video interfaces. Design with the SI8661BC-B-IS1R by placing 0.1 uF decoupling capacitors on both VDD pins and routing the high-speed traces as 50 ohm microstrip if edge rates exceed 30 Mbps. The enable pin (pin 16) should be tied high for normal operation; floating it disables all outputs and pulls them to default low. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical layout notes drawn from the Skyworks Si866x datasheet family - context that the datasheet alone does not provide for sourcing and second-source decisions.
SI8662BB-B-IS1 - 6-Ch 2.5kVrms Digital Isolator | Skyworks
The Skyworks (formerly Silicon Labs) SI8662BB-B-IS1 is a 6-channel CMOS digital isolator rated at 2500Vrms with up to 150 Mbps data rate and 35 kV/us common-mode transient immunity (CMTI), housed in a 16-pin narrow-body SOIC (NB SOIC-16, 0.154 inch / 3.90 mm width). It uses Skyworks' proprietary RF-coupled isolation technology instead of optocouplers or transformers, eliminating LED aging and bulky magnetics while supporting 2.5V to 5.5V I/O levels on both sides. A digital isolator is a semiconductor device that transfers logic signals between two galvanically isolated voltage domains while maintaining a high withstand-voltage isolation barrier (typically 2.5 kVrms to 5 kVrms). Digital isolators belong to the interface IC family within the broader category of isolation components, alongside optocouplers, isolated gate drivers, and isolated ADCs. They are widely used to break ground loops, protect low-voltage logic from high-voltage spikes, and meet safety standards such as IEC 60747-17 and UL 1577 in industrial, automotive, and renewable-energy systems. Key features include a 150 Mbps maximum signaling rate, 8 ns typical propagation delay, 35 kV/us minimum CMTI, 2.5V to 5.5V wide-side supply range, and a default low or default high output option (the 'B' suffix in this SKU indicates a specific channel-direction configuration). The device operates from -40C to +125C, supports up to 2500Vrms continuous isolation, and integrates refresh, watchdog, and under-voltage lockout functions on each side. The NB SOIC-16 package is a creepage-optimized 300 mil body that satisfies 8 mm reinforced isolation when properly board-mounted. The Si8662 family uses a differential RF carrier that crosses the GBD-coupled isolation barrier and is recovered on the opposite side by a low-power receiver. This architecture delivers >10x lower dynamic current than legacy optocouplers and supports DC-correct data with deterministic propagation delay across temperature, simplifying timing analysis in SPI, I2C, RS-485, and CAN isolation. Typical applications include industrial PLC digital I/O isolation, isolated SPI/UART bridges, solar inverter gate-drive signal isolation, motor control feedback isolation, isolated RS-485/CAN transceivers, and medical equipment patient-isolated interfaces. The wide 2.5V-5.5V supply range makes it compatible with 3.3V MCUs, 5V logic, and 1.8V SoCs without level shifters. When designing with the SI8662BB-B-IS1, place 0.1 uF bypass capacitors as close as possible to both VDD pins (VDD1 and VDD2) and maintain a minimum 4 mm clearance under the device to preserve the 2500Vrms isolation rating. Decouple each supply independently; do not share ground returns across the isolation barrier. This page synthesizes distributor pricing, drop-in alternative cross-reference data from Skyworks' Si86xx family, and practical PCB-layout design notes for the 16-pin narrow-body SOIC footprint that are not available in the standalone manufacturer datasheet.
SI8662BB-B-IU - 6-Channel 2.5kV Digital Isolator, 150Mbps | Skyworks
The Skyworks Solutions SI8662BB-B-IU is a low-power six-channel digital isolator based on proprietary CMOS isolation technology, providing 2.5 kVrms galvanic isolation across 4 forward and 2 reverse unidirectional channels in a 16-pin QSOP package. Key electrical parameters include a maximum data rate of 150 Mbps, propagation delay below 13 ns, and 50 kV/µs common-mode transient immunity (CMTI), making the part well-suited for high-speed digital signaling in harsh industrial environments. A digital isolator is a semiconductor device that transfers logic signals between two galvanically-isolated voltage domains using an internal high-voltage isolation barrier. Within the broader product hierarchy, the SI8662BB-B-IU is a general-purpose multi-channel isolator in the category of digital isolators -> isolators -> interface ICs -> integrated circuits. Digital isolators replace legacy optocouplers in modern designs because they offer higher speed, lower power consumption, tighter channel-to-channel matching, and significantly better CMTI performance, all critical for SPI, RS-485, GPIO, and digital control interfaces crossing an isolation barrier. Key features of the SI8662BB-B-IU include Schmitt-trigger inputs for high-noise-immunity logic sensing, a fail-safe default-high output mode when input power is lost, integrated dc-dc switch-driving circuitry on dedicated channels, and stable operating parameters across the -40C to +125C industrial temperature range. The device operates from 2.5 V to 5.5 V on both sides of the barrier, allowing direct interfacing with 3.3 V and 5 V logic without level shifters. Architecturally, the SI8662BB-B-IU uses Skyworks' proprietary CMOS isolation barrier with on-off keying (OOK) modulation and differential signal transmission across the capacitive isolation barrier. This architecture achieves the 50 kV/µs CMTI rating necessary to survive fast switching transients in motor-drive and power-conversion systems, while keeping per-channel quiescent current in the low milliamp range. Typical applications for the SI8662BB-B-IU include isolated SPI interfaces between microcontrollers and gate drivers in motor drives, isolated RS-485 / CAN transceivers in industrial fieldbus nodes, isolated GPIO and digital feedback channels in solar inverters, isolated control interfaces for AC-DC and DC-DC power supplies, and isolated data acquisition front-ends in measurement equipment. The wide temperature range and high CMTI also make the part appropriate for automotive and traction applications requiring reinforced isolation. When designing with the SI8662BB-B-IU, place decoupling capacitors (typically 0.1 µF) close to each VDD pin on both sides of the isolation barrier and keep the QSOP package away from high-dV/dt traces to avoid disturbing the capacitive coupling path. Note that the -I suffix indicates the QSOP-16 wide-body package, which is not drop-in compatible with the -IS1 (SOIC-16 wide-body) variant - confirm the PCB footprint matches the package code before substitution. This page synthesizes distributor pricing, drop-in cross-brand alternatives, and practical design notes that engineers can use to evaluate the SI8662BB-B-IU against its closest pin-compatible competitors.
SI8662BC-B-IS1R - 6-Ch 150Mbps Digital Isolator | Skyworks
The Skyworks Solutions SI8662BC-B-IS1R is a 6-channel CMOS digital isolator rated at 3750 Vrms withstanding voltage, 150 Mbps maximum data rate, and 35 kV/us CMTI, housed in a 16-pin narrow-body SOIC (3.90 mm width) package. It uses Silicon Labs' proprietary RF-coupled isolation technology, integrating an onboard DC-DC converter on the chip so each side can be powered from a single 3.0 V to 5.5 V supply without external bypass or isolation transformers. The 'BC' channel configuration provides 6 forward channels (six in the same direction), making it suitable for unidirectional high-speed signal transfer across an isolation barrier. What is a digital isolator? A digital isolator is a semiconductor device that transfers digital signals across an isolation barrier using high-voltage capacitors, micro-transformers, or optocouplers. They replace legacy optocouplers in industrial, automotive, and medical systems where galvanic isolation is required for safety, ground-loop elimination, or noise immunity. Within the broader taxonomy, digital isolators are interface ICs (interface > isolation > galvanic isolator) and compete directly with traditional optocouplers while offering higher speed, longer lifetime, and tighter channel-to-channel matching. Key features of the SI8662BC-B-IS1R include an operating temperature range of -40C to +125C, propagation delay of approximately 18 ns typical, and an integrated shutdown mode that drops current consumption to near-zero during idle states. The device meets UL 1577, CSA, and VDE safety certification targets for reinforced insulation at 3750 Vrms. Channel-to-channel timing skew is tightly controlled, making it ideal for parallel data buses and synchronous SPI or GPIO expansion across isolation. Technically, the SI8662BC-B-IS1R uses Skyworks' CMOS-based isolation architecture with on-chip RF couplers, eliminating the need for LED-based emitters used in optocouplers. This yields a 50+ year operating life, much better than optocouplers whose LEDs degrade over time. Six independent channels share the same silicon die but are individually isolated, so a fault on one channel does not propagate to others, enhancing system-level reliability in industrial PLCs and motor drives. Typical applications include SPI/peripheral isolation in industrial PLCs, isolated GPIO interfaces in motor drives, isolated data acquisition front ends, USB isolation, isolated RS-485/RS-232 transceiver interfaces, and isolated sensor signal chains in medical and renewable-energy inverters. The SI8662BC-B-IS1R's 35 kV/us CMTI ensures robust operation in noisy environments such as IGBT motor drive switching nodes. When designing with this part, place 0.1 uF bypass capacitors as close as possible to each VDD pin (one per side) and avoid routing high-speed digital traces directly under the isolation barrier to maintain creepage and clearance requirements. Designers should also reserve at least 4 mm of external PCB creepage if the application targets reinforced insulation (VDE 0884). This page consolidates verified distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet, giving engineers a faster path to an isolation BOM decision.
SI8662BD-B-IS - 6-Ch 5kVrms 150Mbps Digital Isolator | Skyworks
The Skyworks SI8662BD-B-IS is a 6-channel CMOS digital isolator rated at 5000 Vrms with a maximum data rate of 150 Mbps and a common-mode transient immunity (CMTI) of 35 kV/us, housed in a 16-pin wide-body SOIC (7.50 mm) package. Built on Skyworks' proprietary RF-based isolation architecture, the device replaces legacy optocouplers in modern industrial and renewable-energy interfaces by integrating six isolated data paths in a single IC. What is a digital isolator? A digital isolator is a semiconductor device that transfers logic signals across an isolation barrier using high-frequency carrier modulation through a silicon-dioxide dielectric, providing galvanic isolation between two circuit domains while preserving signal integrity. Digital isolators occupy the broader hierarchy of signal-conditioning ICs, sitting between simple level shifters (no isolation) and full optocoupler replacements, and they belong to the interface IC category alongside RS-485 transceivers and CAN isolators. Key features include 5000 Vrms withstand voltage, six independent unidirectional channels, propagation delay of 8 ns typical, fail-safe output behavior with a power-on reset, and support for 2.5 V to 5.5 V supply rails on both sides. The wide-body SOIC package provides the reinforced creepage and clearance required for 5 kV reinforced isolation per IEC 60747-17 / VDE 0884-11. Operating quiescent current is below the datasheet typical value, and no external initialization is required at startup, eliminating the timing race conditions found in older LED-based optocouplers. Internally, the SI8662BD-B-IS uses on-off keying (OOK) modulation with differential RF carriers transmitted across a high-voltage CMOS dielectric barrier. An integrated differential receiver on the far side reconstructs the original logic transition with deterministic propagation delay (8 ns typical, 13 ns maximum). This topology achieves >60-year continuous operating life at the rated working voltage and provides stable CMTI behavior across the full industrial temperature range. Typical applications include industrial fieldbus isolation (RS-485, RS-232, CAN), solar inverter gate driver signaling, motor control encoder interfaces, PLC digital input modules, and isolated SPI/UART links. It is also widely used in medical patient-isolated data acquisition and EV battery management system (BMS) communications where reinforced isolation is mandatory. When designing with the SI8662BD-B-IS, place 0.1 uF bypass capacitors on each VDD pin within 2 mm of the IC, and verify PCB creepage of at least 8 mm across the package body to maintain rated isolation. Avoid routing signal traces or copper pours directly under the package body, since the dielectric barrier must remain the only galvanic path between the two domains. This page synthesizes distributor pricing, drop-in Si866x-family and competitor equivalents, and practical layout guidance that is not collected in any single manufacturer document.