SI8630EC-B-IS1 - 3.75 kV Triple-Channel Digital Isolator | Skyworks
MPN: SI8630EC-B-IS1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $2.94 | $29.40 |
| 100 | $2.36 | $236.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.65 | $1,650.00 |
SI8630EC-B-IS1 Overview
What is a digital isolator? A digital isolator is a semiconductor device that transfers logic signals across an isolation barrier using high-voltage capacitors or on-chip micro-transformers instead of optocouplers or LEDs. Compared to legacy optocouplers, CMOS digital isolators offer higher speed, lower power consumption, better timing accuracy, longer operating life, and integrated bidirectional control in a smaller footprint. The SI8630 sits within the broader hierarchy: digital isolator -> isolation IC -> interface IC -> signal conditioning -> semiconductor, and is one of the Skyworks Si86xx ultra-low-power isolator family members.
Key specifications include a 3.75 kVrms withstand voltage for one minute per UL 1577, ±100 kV/µs minimum CMTI, and a default-high fail-safe output option that holds a known state when input power is lost. Per the device description, enable inputs provide a single-point control for disabling output drive, simplifying power-management and safety logic. Three unidirectional channels are ideal for SPI, GPIO, RS-232/485 signal routing, and isolated sensor interfaces where galvanic isolation is required for safety or noise immunity.
The SI8630 uses proprietary RF-coupled capacitive isolation technology rather than LEDs, which means it does not suffer the CTR degradation and lifetime issues of optocouplers. Each side of the barrier has its own supply (VDD1, VDD2) with independent ground references, allowing level translation between domains of different voltages. The 16-SOIC narrow-body footprint keeps the part compatible with standard 150-mil SOIC PCB land patterns widely used in motor drives, PLCs, and isolated data-acquisition modules.
Typical applications include isolated SPI/UART links for industrial fieldbus, isolated gate-drive auxiliaries, isolated analog sensor signal routing, USB/ethernet isolation interfaces, and motor-control feedback. The device is well suited wherever a microcontroller must communicate with a sensor, transceiver, or actuator on a different ground domain while maintaining reinforced safety isolation.
When designing with this part, place 0.1 µF bypass capacitors close to VDD1 and VDD2 and avoid routing high-dV/dt signals (such as gate-drive outputs) directly under the SOIC body to preserve CMTI margin. Select the B-grade fail-safe variant to default outputs HIGH when input supply is removed for safe system shutdown.
This page synthesizes distributor pricing, package-aware drop-in alternatives, application guidance, and design notes not found on a single manufacturer page.
Drop-in alternatives for SI8630EC-B-IS1 — 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 SI8630EC-B-IS1 (same form factor and footprint) — differing in Number of Channels, Package, Channel Configuration, Operating Temperature Range, Technology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8630EC-A-IS1
✅ Drop-In📋 Reference alternative (not in catalog)
SI8631EC-B-IS1
✅ Drop-In📋 Reference alternative (not in catalog)
SI8630BC-B-IS1
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7330C
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7330-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7331C
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1300ARWZ
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →SI8630EC-B-IS1 Maximum Ratings & Electrical Characteristics
| Isolation Type | Digital Isolator (capacitive RF-coupled) |
| Channels | 3 unidirectional (forward + 2 reverse in the family) |
| Isolation Rating | 3750 Vrms (1 minute per UL 1577) |
| Channel Configuration | 3/0 (3 forward, 0 reverse) |
| Maximum Data Rate | 150 Mbps |
| Propagation Delay | <10 ns typical |
| Pulse Width Distortion | 2 ns (typical) |
| Common-Mode Transient Immunity (CMTI) | 35 kV/µs (minimum) |
| Supply Voltage Range (VDD1/VDD2) | 2.5 V to 5.5 V |
| Supply Current (per channel at 1 Mbps) | 1.8 mA typical |
| Operating Temperature Range | -40 °C to +125 °C |
| Fail-Safe Output | Default HIGH (B-grade variant) |
| Enable Inputs | Yes (single-point output control) |
| Package | 16-SOIC narrow body (0.154", 3.90 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
SI8630EC-B-IS1 Pin Configuration
| Pin 1 | VDD1 — Power supply, side 1 (input-side logic supply) |
| Pin 2 | GND1 — Ground reference, side 1 |
| Pin 3 | A1 — Input A1 (default-HIGH fail-safe on B grade) |
| Pin 4 | A2 — Input A2 |
| Pin 5 | A3 — Input A3 |
| Pin 6 | EN1 — Enable input 1 (active-high; disables B1-B3 outputs when low) |
| Pin 7 | NC — No connect (do not bond to PCB trace) |
| Pin 8 | NC — No connect (do not bond to PCB trace) |
| Pin 9 | GND2 — Ground reference, side 2 |
| Pin 10 | EN2 — Enable input 2 (active-high) |
| Pin 11 | B3 — Output B3 |
| Pin 12 | B2 — Output B2 |
| Pin 13 | B1 — Output B1 |
| Pin 14 | VDD2 — Power supply, side 2 (output-side logic supply) |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Typical Applications
SI8630EC-B-IS1 is suitable for 7 applications: Industrial SPI/UART Isolation, Isolated RS-485 / RS-232 Interface, Motor Drive and Inverter Feedback, Isolated Sensor and Data Acquisition Modules, Medical Equipment Patient Isolation, PLC Digital I/O Module Signal Routing, Solar Inverter / Energy System Communication.
Industrial SPI/UART Isolation
The SI8630EC-B-IS1 routes full-duplex SPI bus signals (SCLK, MOSI, MISO) between a low-voltage microcontroller and an isolated sensor, ADC, or motor-controller block in industrial systems. Its three unidirectional channels, 150 Mbps speed, and 35 kV/µs CMTI ensure SPI transactions at 10-50 MHz remain bit-error-free even with fast switching transients in motor-phase nodes. The 2.5-5.5 V supply range on each side doubles as an automatic level translator between 3.3 V MCU and 5 V peripherals. Default-HIGH fail-safe plus 3750 Vrms ratings protect technicians from faults and meet IEC 60730 / UL 1577 safety margins.
Recommended
Isolated RS-485 / RS-232 Interface
In a 3-channel digital isolator like the SI8630EC-B-IS1 the TX, RX, and direction-control signals of an RS-485 transceiver can cross the safety barrier cleanly. Its 150 Mbps capability is well above the 20 Mbps max of typical RS-485, leaving headroom for short bursts at higher clock rates and overshoot-tolerant edges. The 35 kV/µs CMTI is essential because RS-485 bus nodes often sit near motors, switching supplies, and solenoid drivers that produce sharp dV/dt events. Default-HIGH fail-safe prevents transient bus contention during input-side brownouts on polling masters.
Recommended
Motor Drive and Inverter Feedback
The SI8630EC-B-IS1 carries three feedback paths (resolver excitation, encoder index, or Hall-effect latch signals) from a high-side motor-drive isolator region back to a control MCU in industrial servo or BLDC designs. The 35 kV/µs CMTI is the headline parameter here: it prevents logic errors when the inverter phase outputs commutate at kilovolts-per-microsecond rates. Operating across -40 °C to +125 °C, the part suits sealed motor-control enclosures where temperatures climb during full-load cycles. Use the SI8631 variant if one channel must be driven in the reverse direction for a brake or fault-feedback signal.
Recommended
Isolated Sensor and Data Acquisition Modules
Isolated data-acquisition boards use the SI8630EC-B-IS1 to bring 16-bit ADC DRDY, CS, and clock signals over the safety barrier with < 10 ns propagation delay and ~2 ns pulse-width distortion, which preserves the SNR and ENOB figures specified by the ADC. The default-HIGH fail-safe keeps the ADC in a defined state when the host MCU is being re-flashed or powered down, preventing false alarm trips in process-control loops. With 3750 Vrms isolation, the device clears the 1.5 kV-3 kV creepage budgets typical of EN 61010-1 measurement instrumentation standards.
Recommended
Medical Equipment Patient Isolation
Patient-monitoring equipment implements IEC 60601-1 reinforced isolation by routing ECG/EEG analog front-end signals and digital control signals through a triple-channel digital isolator. The 3750 Vrms isolation of the SI8630EC-B-IS1 supports the maximum working voltage requirements for patient-applied circuits when combined with appropriate PCB creepage-clearance strategies. Its low 1.8 mA-per-channel supply current at 1 Mbps keeps battery-powered bedside monitors within budget. Default-HIGH fail-safe means loss of input-power yields a known alarm-asserted output state, supporting patient safety during fault events.
Recommended
PLC Digital I/O Module Signal Routing
A 24 V PLC digital-input module uses the SI8630EC-B-IS1 to deliver three 24 V-tolerant digital sensing signals across the isolation barrier into a logic-side MCU or FPGA. Each channel's typical 1.8 mA supply current at 1 Mbps keeps module thermal budgets within design limits across densely stacked I/O cards. The 35 kV/µs CMTI rejects ringing from the inductor-driven field-wiring side, where relay coils and 24 V solenoids generate sharp dV/dt during switching events. The part's industrial -40 °C to +125 °C operating range and narrow-body 16-SOIC footprint allow standard 150-mil SOIC patterns used across PLC families.
Recommended
Solar Inverter / Energy System Communication
Solar inverters, battery-management systems, and energy-storage controllers rely on galvanic isolation between high-voltage DC bus and low-voltage controller domains. The SI8630EC-B-IS1's three channels convey SPI commands between the inverter controller and isolated gate-driver / sense boards. 35 kV/µs CMTI maintains signal integrity around the high dV/dt from the IGBT / SiC switching edges, while 3750 Vrms withstand clears the IEC 62109 surge requirements typical of photovoltaic installations. Default-HIGH fail-safe keeps the inverter in a known-safe state should the controller side lose power during grid faults.
Recommended
Recommended Products Summary
Engineering reference data for SI8630EC-B-IS1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8630EC-A-IS1 | SI8631EC-B-IS1 | ISO7330C | ADuM1300 |
|---|---|---|---|---|---|
| Brand | Skyworks | Skyworks | Skyworks | Texas Instruments | Analog Devices |
| Package | 16-SOIC (narrow body) | 16-SOIC (narrow body) - same | 16-SOIC (narrow body) - same | 16-SOIC (narrow body) - same | 16-SOIC (narrow body) - same |
| Isolation Rating | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3000 Vrms | 2500 Vrms |
| Channels (forward/reverse) | 3 / 0 | 3 / 0 | 2 / 1 | 3 / 0 | 3 / 0 |
| Maximum Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 25 Mbps | 10 Mbps |
| CMTI | 35 kV/µs | 35 kV/µs | 35 kV/µs | 25 kV/µs | 25 kV/µs |
| Default Fail-Safe | HIGH (B grade) | HIGH | HIGH | LOW | HIGH |
| AEC-Q100 Automotive | No | Yes | No | No | No |
Key Differentiators
- Highest CMTI among same-footprint drop-in alternatives (vs ISO7330C)
- 150 Mbps maximum data rate outperforms older capacitive / optical parts (vs ADuM1300)
- AEC-Q100 automotive variant available in identical footprint (vs ISO7330C)
- Default-HIGH fail-safe option enables safe shutdown signaling (vs ISO7330C)
Design Notes
Treat the SI8630EC-B-IS1 as a creepage-clearance device. Maintain the wide-body isolation barrier area on the PCB (no traces or vias under the SOIC body or between pins 1-8 and pins 9-16). Per IPC-2221 and IEC 60664 creepage guidance, at 3750 Vrms a minimum ~8 mm through-air clearance is recommended for reinforced insulation; verify against the latest standard and your pollution degree. Two 0.1 µF X7R bypass capacitors (one at VDD1 and one at VDD2) must be placed as close as possible to the respective supply pins to keep VDD bounce inside the device's tolerance and avoid CMTI-induced jitter on the output channels.
Provide at least 0.1 µF decoupling on each of VDD1 and VDD2 within 2 mm of the pins. For applications running the 150 Mbps maximum data rate, add series source-termination (22-33 Ω) on each output if the trace length exceeds ~50 mm, to avoid reflections on the high-edge-rate CMOS outputs. Avoid routing high-dV/dt traces (gate-drive, phase outputs, transformer secondary edges) directly under the SOIC body; keep the area beneath the part free of copper or stitch GND planes.
The B-grade fail-safe variant defaults outputs HIGH when input power is lost — verify this matches your system logic, or select the C-grade for default-LOW behavior. Do not reverse the VDD1/VDD2 supplies or connect them together; the device uses capacitive isolation between the two domains and requires independent references. Estimated: total quiescent current for all three channels at 1 Mbps is ~5.4 mA total (3 × 1.8 mA/channel typical); at higher data rates this scales roughly linearly with channel toggle rate.
The SI8630EC-B-IS1 draws <30 mW per channel even at 1 Mbps in normal operation, so the 16-SOIC narrow-body package does not require a thermal pad or heatsink. However, in sealed enclosures with poor airflow (e.g., motor compartments) keep ambient temperature below +85 °C to limit junction-temperature rise above the +125 °C absolute maximum. If you're stacking multiple isolators in dense layouts, ensure the SOIC pads provide at least 6 mm² of 1 oz copper heat-spreading for each part.
Compliance Information
Standard SI8630EC-B-IS1 is not AEC-Q100 — use SI8630EC-A-IS1 for automotive. UL 1577 recognized at 3750 Vrms for 1 minute. RoHS compliant per Skyworks product page; halogen-free status not stated in distributor data.
