SI8662BC-B-IS1R - 6-Ch 150Mbps Digital Isolator | Skyworks
MPN: SI8662BC-B-IS1R ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.45 | $345.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.7 | $2,700.00 |
SI8662BC-B-IS1R Overview
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.
Drop-in alternatives for SI8662BC-B-IS1R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SI8662BC-B-IS1R (same form factor and footprint) — differing in MSL Level, Package, Number of Channels, Channel Configuration, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8662BB-B-IS1
✅ Drop-In✓ In Stock
$3.31 / Unit
View Datasheet →SI8660BB-B-IS1
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →SI8641BD-B-ISR
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →SI8642BB-B-IU
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →SI8640BD-B-IS
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →SI8630EC-B-IS1
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →SI8662BC-B-IS1R Specifications
| Isolation Voltage (Withstand) | 3750 Vrms |
| Number of Channels | 6 (6 forward / 0 reverse) |
| Channel Configuration | BC (6F/0R) |
| Maximum Data Rate | 150 Mbps |
| Common Mode Transient Immunity (CMTI) | 35 kV/us |
| Supply Voltage (VDD1, VDD2) | 3.0 V to 5.5 V |
| Propagation Delay (Typical) | 18 ns |
| Operating Temperature Range | -40C to +125C |
| Package Type | 16-SOIC Narrow (0.154 inch / 3.90 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 2 |
| Safety Approvals (Targets) | UL 1577, CSA, VDE 0884 reinforced insulation |
| RoHS Status | Compliant |
| Technology | CMOS RF-coupled digital isolation |
| Shutdown Mode | Supported |
SI8662BC-B-IS1R Pin Configuration
| Pin 1 | VDD1 — Side 1 power supply, 3.0V to 5.5V |
| Pin 2 | GND1 — Side 1 ground |
| Pin 3 | IN1 — Input channel 1 (side 1) |
| Pin 4 | IN2 — Input channel 2 (side 1) |
| Pin 5 | IN3 — Input channel 3 (side 1) |
| Pin 6 | IN4 — Input channel 4 (side 1) |
| Pin 7 | IN5 — Input channel 5 (side 1) |
| Pin 8 | IN6 — Input channel 6 (side 1) |
| Pin 9 | GND2 — Side 2 ground |
| Pin 10 | OUT1 — Output channel 1 (side 2) |
| Pin 11 | OUT2 — Output channel 2 (side 2) |
| Pin 12 | OUT3 — Output channel 3 (side 2) |
| Pin 13 | OUT4 — Output channel 4 (side 2) |
| Pin 14 | OUT5 — Output channel 5 (side 2) |
| Pin 15 | OUT6 — Output channel 6 (side 2) |
| Pin 16 | VDD2 — Side 2 power supply, 3.0V to 5.5V |
Typical Applications
SI8662BC-B-IS1R is suitable for 7 applications: Industrial PLC Isolated SPI Bus, Motor Drive IGBT Gate-Drive Isolation, Isolated GPIO Expansion, Medical Patient-Monitoring Isolation, Solar Inverter Isolated Communications, Isolated USB / RS-485 Transceiver Interface, Automotive 12V Battery Management Isolation.
Industrial PLC Isolated SPI Bus
The SI8662BC-B-IS1R fits this application because its 150 Mbps data rate easily exceeds the 10-50 MHz SPI bandwidth typically used in industrial PLC peripheral expansion, while the 3750 Vrms isolation rating supports reinforced insulation across the field-to-controller boundary. Placed between a CPU's SPI peripheral and isolated ADC/DAC chips, the part transfers 6 unidirectional lines (MOSI, SCK, plus 4 GPIOs) across the isolation barrier in one device. Unlike optocouplers, the Si8662BC's CMOS RF-coupled isolation eliminates LED degradation, giving a 50+ year operating life in always-on factory automation.
Recommended
Motor Drive IGBT Gate-Drive Isolation
The SI8662BC-B-IS1R's 35 kV/us minimum CMTI makes it ideal for motor drives where high-side IGBT switching produces fast dv/dt transients that would corrupt low-side control signals. Six forward channels map directly to the gate-emitter drive, fault-feedback, and overcurrent-disable signals of a 3-phase inverter, with the part placed across the 1500 V working-voltage isolation barrier. With 18 ns propagation delay and tight channel-to-channel skew, the part preserves PWM timing integrity, while its surface-mount 16-SOIC package simplifies assembly vs. optocoupler-based designs.
Recommended
Isolated GPIO Expansion
In isolated GPIO expansion across industrial bus isolators, the SI8662BC-B-IS1R's six forward channels can carry 6 GPIO lines from a microcontroller across the safety barrier to a remote I/O module in a single IC, reducing board area by 40% versus discrete optocoupler arrays. The 3750 Vrms withstand voltage supports IEC 61800-5-1 reinforced insulation for motor-drive peripherals, and the 3.0-5.5 V supply range simplifies integration with 3.3 V or 5 V controllers without level shifters. Trade-off: the part is unidirectional; use SI8662BB for bidirectional GPIO.
Recommended
Medical Patient-Monitoring Isolation
Patient-monitoring equipment requires IEC 60601-1 reinforced insulation between applied parts and the rest of the system, and the SI8662BC-B-IS1R's 3750 Vrms isolation rating supports this barrier. Six unidirectional channels carry ECG, SpO2, respiration, and temperature data from the patient front-end to the processing unit, while 35 kV/us CMTI prevents defibrillator-induced transients from corrupting signal integrity. Unlike optocouplers, the CMOS architecture eliminates the LED-current draw that limits battery life in portable monitors, extending runtime by 15-20%.
Recommended
Solar Inverter Isolated Communications
In a 1500 V DC solar inverter, the SI8662BC-B-IS1R isolates the high-voltage string-monitoring ADC SPI bus from the low-voltage controller, with 3750 Vrms withstand and 35 kV/us CMTI handling the harsh dv/dt from IGBT switching. Six forward channels accommodate SPI plus enable/fault lines in a single 16-SOIC IC, reducing BOM count by 60% vs. discrete optocouplers. Operating from -40C to +125C, the part survives the outdoor enclosure thermal environment without derating.
Recommended
Isolated USB / RS-485 Transceiver Interface
Industrial USB-to-RS485 bridges benefit from the SI8662BC-B-IS1R's isolation between the USB transceiver and the field-side RS-485 driver, where 3750 Vrms withstand protects operator-side equipment from field-side ground loops and surge events. Six unidirectional channels cover USB D+/D-, flow-control, and power-enable in a single device. The 150 Mbps data rate far exceeds USB Full Speed (12 Mbps) and RS-485 (10 Mbps) requirements, providing 10x timing margin. Designers should add common-mode chokes on the field side for additional EMI immunity.
Recommended
Automotive 12V Battery Management Isolation
In 12V automotive battery management systems (BMS), the SI8662BC-B-IS1R isolates the high-voltage battery stack monitoring lines from the low-voltage ECU, supporting reinforced insulation across the 60V working voltage barrier. Six forward channels handle cell-voltage and temperature monitoring signals with 18 ns propagation delay, preserving BMS sampling accuracy. The -40C to +125C operating range covers under-hood environments, while the 35 kV/us CMTI tolerates load-dump transients. For AEC-Q100-qualified variants look at Si86xx-Q1 family from Skyworks.
Recommended
Recommended Products Summary
Engineering reference data for SI8662BC-B-IS1R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8662BB-B-IS1 | SI8660BB-B-IS1 | SI8641BD-B-ISR | SI8642BB-B-IU | SI8630EC-B-IS1 |
|---|---|---|---|---|---|---|
| Brand | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Package | 16-SOIC Narrow (3.90 mm) | 16-SOIC Narrow | 16-SOIC Narrow | 16-SOIC Narrow | 16-QSOP | 16-SOIC Narrow |
| Number of Channels | 6 | 6 | 6 (different map) | 4 | 4 | 3 |
| Channel Direction | 6F/0R (BC) | 4F/2R (BB) | 6F/0R (BB) | varies (BD) | 4F/2R | varies (EC) |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms |
| Maximum Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps |
| CMTI (Minimum) | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Highest unidirectional channel count in 16-SOIC Narrow at 150 Mbps (vs SI8641BD-B-ISR)
- Full 6F/0R unidirectional configuration for parallel data buses (vs SI8662BB-B-IS1)
- Site MPN cross-link coverage (vs Cross-brand ISO7760 from TI)
Design Notes
Place 0.1 uF low-ESR ceramic bypass capacitors as close as possible to each VDD pin (one per side, ideally within 2 mm trace length). The PCB layout between side 1 and side 2 ground planes must maintain a minimum creepage of 4 mm (for reinforced 250 Vrms working voltage) and clearance of 3 mm through the air gap. Use a slot or cut-out in the PCB directly under the SOIC body to eliminate the high-frequency capacitive coupling path between the two grounds. Per UL 1577 and VDE 0884 requirements, do not route any traces or copper pours under the SOIC-16 package body.
Each side of the SI8662BC-B-IS1R draws approximately 8-12 mA typical supply current at 5V with all channels switching. The part supports 3.0 V to 5.5 V on each side independently, so 3.3 V and 5 V domains can be mixed across the isolation barrier. For low-power applications, the shutdown mode drops each side's quiescent current below 1 uA, useful for battery-powered isolated sensors where the controller sleeps between measurements.
Do not assume channel-direction symmetry across Si86xx part numbers - the 'BC', 'BB', and 'BD' suffixes denote very different channel maps and swapping them without re-checking signal routing will silently break communication. Always verify the channel configuration matches your schematic signal-direction intent before PCB layout sign-off. Also note that the SI86xx family does not include isolated power - if you need power transfer across the barrier, pair the SI8662BC-B-IS1R with a Skyworks Si8700 isolated gate driver or an external DC-DC isolator.
Compliance Information
UL 1577, CSA, and VDE 0884 reinforced insulation certification targets per the Si866x datasheet. Not AEC-Q100 qualified in standard variant. Halogen-free status not explicitly stated in verified data - marked unknown.
