SI8662BB-B-IU - 6-Channel 2.5kV Digital Isolator, 150Mbps | Skyworks
MPN: SI8662BB-B-IU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.41 | $44.10 |
| 100 | $3.95 | $395.00 |
| 500 | $3.52 | $1,760.00 |
| 1,000 | $3.18 | $3,180.00 |
SI8662BB-B-IU Overview
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.
Drop-in alternatives for SI8662BB-B-IU — 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 SI8662BB-B-IU (same form factor and footprint) — differing in Channel Configuration, Common-Mode Transient Immunity (CMTI), Number of Channels, Operating Temperature Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8662BC-B-IU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI8662BD-B-IU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI8660BB-B-IU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI8661BB-B-IU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI8663BB-B-IU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISO7842DW
✅ Drop-In📋 Reference alternative (not in catalog)
SI8662BB-B-IU Specifications
| Isolation Rating | 2.5 kVrms |
| Number of Channels | 6 (4 forward + 2 reverse) |
| Channel Configuration | Unidirectional |
| Maximum Data Rate | 150 Mbps |
| Propagation Delay | <13 ns |
| Common-Mode Transient Immunity (CMTI) | 50 kV/µs |
| Supply Voltage (VDD) | 2.5 V to 5.5 V |
| Default Output Behavior | Fail-safe high |
| Input Type | Schmitt trigger |
| Technology | CMOS capacitive isolation |
| Operating Temperature Range | -40C to +125C (industrial) |
| Package | 16-pin QSOP (0.154 inch / 3.90 mm body width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
SI8662BB-B-IU Pin Configuration
| Pin 1 | VDD1 — Supply voltage, side 1 (2.5 V to 5.5 V) |
| Pin 2 | GPIO1 — Side 1 input/output channel 1 |
| Pin 3 | GPIO2 — Side 1 input/output channel 2 |
| Pin 4 | GPIO3 — Side 1 input/output channel 3 |
| Pin 5 | GPIO4 — Side 1 input/output channel 4 |
| Pin 6 | GND1 — Ground reference, side 1 |
| Pin 7 | GND2 — Ground reference, side 2 |
| Pin 8 | GPIO5 — Side 2 input/output channel 5 |
| Pin 9 | GPIO6 — Side 2 input/output channel 6 |
| Pin 10 | NC — Not connected (per datasheet pinout, channel direction/configuration pin) |
| Pin 11 | NC — Not connected (per datasheet pinout, channel direction/configuration pin) |
| Pin 12 | NC — Not connected (per datasheet pinout, channel direction/configuration pin) |
| Pin 13 | NC — Not connected (per datasheet pinout, channel direction/configuration pin) |
| Pin 14 | NC — Not connected (per datasheet pinout, channel direction/configuration pin) |
| Pin 15 | GND2 — Ground reference, side 2 (duplicate tie) |
| Pin 16 | VDD2 — Supply voltage, side 2 (2.5 V to 5.5 V) |
Typical Applications
SI8662BB-B-IU is suitable for 6 applications: Isolated SPI Interface for Motor Drives, Isolated RS-485 / CAN Fieldbus Node, Isolated Gate Driver Interface for Solar Inverters, Isolated Analog-to-Digital Front-End, Industrial PLC Digital Input Module, Battery Management System (BMS) Isolation.
Isolated SPI Interface for Motor Drives
The SI8662BB-B-IU provides 2.5 kVrms reinforced isolation for SPI communication between a low-voltage MCU and gate drivers in industrial motor-drive inverters. Its 50 kV/us CMTI rating survives the fast dV/dt transients generated by IGBT switching, while 150 Mbps bandwidth covers SPI clocks above 50 MHz. Typical use places the part between an MCU running field-oriented control firmware and the high-voltage gate-driver stage, isolating control, gate-emitter, and fault-feedback signals across all 6 channels (4 forward + 2 reverse) without adding propagation skew.
Recommended
Isolated RS-485 / CAN Fieldbus Node
Industrial RS-485 and CAN fieldbus nodes use the SI8662BB-B-IU to isolate the transceiver from the host controller, breaking ground loops that cause communication errors on long bus runs across multiple cabinets. The 2.5 kVrms barrier satisfies the isolation requirement for factory-floor equipment, and the 150 Mbps data rate easily accommodates CAN-FD at 5 Mbps and RS-485 at 20 Mbps. The 6 unidirectional channels map cleanly to TX/RX plus RTS/CTS handshake signals, while -40C to +125C operation survives unconditioned cabinet environments.
Recommended
Isolated Gate Driver Interface for Solar Inverters
Solar inverters require robust isolation between the low-voltage control board and the high-voltage DC-AC stage, and the SI8662BB-B-IU delivers 2.5 kVrms across 4 forward + 2 reverse channels for gate-driver PWM and fault feedback signals. Its 50 kV/us CMTI tolerates the dV/dt of string-level switching at 600-1500 VDC bus voltages, and 150 Mbps bandwidth supports high-resolution PWM and fast overcurrent shutdown. Designers pair it with isolated gate drivers or bootstrap supplies to build the high-voltage section safely.
Recommended
Isolated Analog-to-Digital Front-End
Data-acquisition systems and instrumentation digitize analog signals in the high-voltage domain and need clean isolation back to a host controller. The SI8662BB-B-IU carries the ADC serial data, clock, and chip-select signals across its 2.5 kVrms barrier with under 13 ns propagation delay, preserving sample-to-clock alignment. Six channels cover multi-channel ADCs plus range-control GPIO. Its Schmitt-trigger inputs reject noise picked up across the long analog signal runs, while the fail-safe-high default keeps downstream logic in a safe state during power-up.
Recommended
Industrial PLC Digital Input Module
PLC digital input modules use the SI8662BB-B-IU to isolate 24 V field wiring from the 3.3 V / 5 V backplane logic, providing reinforced isolation on each of the 6 channels. The 2.5 kVrms barrier and 50 kV/us CMTI satisfy IEC 61131-2 industrial immunity requirements, and the wide -40C to +125C operating range tolerates cabinet temperatures. Multi-channel input cards benefit from the same part across 4 forward + 2 reverse channels for status LEDs, latch signals, and isolated communication back to the CPU.
Recommended
Battery Management System (BMS) Isolation
High-voltage battery packs require isolation between the cell-monitoring stack and the vehicle/pack controller, and the SI8662BB-B-IU provides 2.5 kVrms across 6 channels to carry SPI plus enable/fault signals to AFE monitors. Its 150 Mbps bandwidth handles high-speed battery AFE communication, while 50 kV/us CMTI tolerates the switching transients from DC-DC converters and traction inverters. The wide temperature range and small QSOP-16 footprint suit space-constrained battery pack PCBAs in electric vehicles and stationary storage installations.
Recommended
Recommended Products Summary
Engineering reference data for SI8662BB-B-IU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8662BC-B-IU | SI8662BD-B-IU | SI8660BB-B-IU | SI8663BB-B-IU | ISO7842DW |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Texas Instruments |
| Package | 16-pin QSOP (0.154 inch / 3.90 mm) | 16-pin QSOP (0.154 inch / 3.90 mm) - same | 16-pin QSOP (0.154 inch / 3.90 mm) - same | 16-pin QSOP (0.154 inch / 3.90 mm) - same | 16-pin QSOP (0.154 inch / 3.90 mm) - same | 16-pin SOIC wide-body (0.154 inch / 3.90 mm) - same pitch |
| Isolation Voltage (Vrms) | 2500 | 3750 (+50%) | 5000 (+100%) | 2500 (same) | 2500 (same) | 5000 (+100%) |
| Number of Channels | 6 (4F + 2R) | 6 (4F + 2R) - same | 6 (4F + 2R) - same | 6 (6F + 0R) | 6 (4F + 2R + dc-dc) - same | 4 (-33%) |
| Max Data Rate (Mbps) | 150 | 150 (same) | 150 (same) | 150 (same) | 150 (same) | 100 (-33%) |
| CMTI (kV/us) | 50 | 50 (same) | 50 (same) | 50 (same) | 50 (same) | 25 (-50%) |
| Supply Voltage Range (V) | 2.5 to 5.5 | 2.5 to 5.5 (same) | 2.5 to 5.5 (same) | 2.5 to 5.5 (same) | 2.5 to 5.5 (same) | 2.25 to 5.5 (slightly wider) |
| Propagation Delay (ns) | <13 | <13 (same) | <13 (same) | <13 (same) | <13 (same) | 16 (+23%) |
Key Differentiators
- 50 kV/us CMTI - 2x the rating of the TI ISO7842 cross-brand drop-in (vs ISO7842DW)
- Six isolated channels in a single QSOP-16 footprint (vs ISO7842DW)
- 150 Mbps bandwidth exceeds typical competitor offerings (vs ISO7842DW)
Design Notes
Estimated: at 5 V supply on both sides and 5 Mbps typical load on all 6 channels, the SI8662BB-B-IU consumes approximately 30-40 mW per channel. Decoupling recommendations are 0.1 uF low-ESR ceramic capacitors placed within 2 mm of each VDD pin (pins 1 and 16), plus an optional 1 uF bulk capacitor per side. Avoid routing noisy high-current traces near the VDD pins to reduce supply-induced channel disturbance.
Maintain the isolation barrier clearance defined by the QSOP-16 wide-body package - the Skyworks datasheet specifies minimum creepage and clearance distances. Avoid placing copper fills or traces under the part bridging the two isolation domains. The high-side and low-side ground returns should connect only at one point (typically the isolated DC-DC primary-side ground) to prevent ground loops from injecting noise across the barrier.
Do not confuse the -I (QSOP-16) package suffix with the -IS1 (SOIC-16 wide-body) suffix - they look identical on a schematic but have different PCB land patterns. Also, the SI8662BB-B-IU has a fail-safe-high default output; if your downstream logic requires fail-safe-low behaviour, you need a different part in the family. Finally, ensure that the upstream power-on ramp on each side does not exceed the device's recommended supply monotonicity - transients during hot-plug events may momentarily violate undervoltage lockout thresholds.
Compliance Information
RoHS compliance per Skyworks product page. Industrial -40C to +125C temperature range; not AEC-Q100 qualified for automotive. Reach, halogen-free, and conflict-mineral compliance are not stated in the verified web data.
