SI8630AB-B-IS - 3-Ch 2.5kV Digital Isolator 1Mbps SOIC-16
MPN: SI8630AB-B-IS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.78 | $27.80 |
| 100 | $2.3 | $230.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.62 | $1,620.00 |
SI8630AB-B-IS Overview
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.
Drop-in alternatives for SI8630AB-B-IS — 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 SI8630AB-B-IS (same form factor and footprint) — differing in Common-Mode Transient Immunity (CMTI), Number of Channels, Propagation Delay, Isolation Voltage, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8630AB-B-IS1
✅ Drop-In✓ In Stock
$2.58 / Unit
View Datasheet →SI8630AB-B-ISR
✅ Drop-In📋 Reference alternative (not in catalog)
SI8631BB-B-IS
✅ Drop-In📋 Reference alternative (not in catalog)
SI8632AB-B-IS
✅ Drop-In📋 Reference alternative (not in catalog)
SI8430BB-D-IS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISO7631FCDWR
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1310ARWZ
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →SI8630AB-B-IS Specifications
| Isolation Rating (rms) | 2500 Vrms |
| Number of Channels | 3 forward / 0 reverse |
| Channel Configuration | 3/0 |
| Maximum Data Rate | 1 Mbps |
| Common-Mode Transient Immunity (CMTI) | 35 kV/us (minimum) |
| Supply Voltage Range (VDD1, VDD2) | 2.70 V to 5.5 V |
| Supply Current per Channel (1 Mbps, 5 V) | < 1.6 mA typical |
| Propagation Delay | 35 ns typical |
| Operating Temperature Range | -40 C to +125 C |
| Package | 16-SOIC wide-body (0.295" / 7.50 mm) |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | MSL 2A |
| Peak Reflow Temperature | 260 C |
| Time at Peak Reflow (max) | 40 s |
| Technology | CMOS digital isolator (RF carrier modulation) |
| Start-up Initialization | None required |
| RoHS Status | Compliant |
SI8630AB-B-IS Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 (2.70-5.5 V) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | A1 — Side 1 input/output channel 1 |
| Pin 4 | A2 — Side 1 input/output channel 2 |
| Pin 5 | A3 — Side 1 input/output channel 3 |
| Pin 6 | GND1 — Ground reference for side 1 |
| Pin 7 | GND1 — Ground reference for side 1 |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | GND2 — Ground reference for side 2 |
| Pin 10 | GND2 — Ground reference for side 2 |
| Pin 11 | B3 — Side 2 input/output channel 3 |
| Pin 12 | B2 — Side 2 input/output channel 2 |
| Pin 13 | B1 — Side 2 input/output channel 1 |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | VDD2 — Supply voltage for side 2 (2.70-5.5 V) |
| Pin 16 | NC — Not connected (per datasheet) |
Typical Applications
SI8630AB-B-IS is suitable for 7 applications: Isolated SPI/UART Interface, Isolated Gate-Drive Logic for Solar Inverters, Industrial PLC Isolated IO, Isolated RS-485 / RS-232 Segments, Medical Equipment Signal Isolation, Isolated I2C Bus Bridge, Isolated Sensor Front-End Interface.
Isolated SPI/UART Interface
The SI8630AB-B-IS isolates SPI or UART links between a 3.3 V MCU and a 5 V industrial peripheral, with three forward channels easily handling MOSI, SCK, and a chip-select line at speeds up to 1 Mbps. Its 35 kV/us minimum CMTI rejects switching transients from adjacent power stages, while the 35 ns typical propagation delay preserves bus timing margins for full-speed SPI at 10 MHz. With sub-1.6 mA per-channel current at 5 V, the isolator adds far less heat than optocouplers, allowing dense multi-channel isolation in compact PLC and sensor modules.
Recommended
Isolated Gate-Drive Logic for Solar Inverters
In solar inverter control boards, the SI8630AB-B-IS isolates the low-voltage PWM controller signals from the high-voltage gate-driver section, providing 2500 Vrms galvanic isolation required by UL 1741. The 3 forward channels carry PWM, fault, and reset signals, while 35 kV/us CMTI immunity withstands the fast dV/dt edges of the switching IGBT/SiC bridge. The wide 2.70-5.5 V supply lets the controller side run from 3.3 V while the gate-driver side uses 5 V, eliminating the need for a level shifter. The wide-body SOIC-16 footprint provides the 8 mm creepage required by IEC 62109 for reinforced isolation.
Recommended
Industrial PLC Isolated IO
The SI8630AB-B-IS provides 3-channel isolation for 24 V PLC discrete-IO modules, bridging logic-level signals from the field-side optocoupler array back to the controller. Its 35 ns propagation delay is far faster than the 1-10 usec typical optocoupler, enabling high-speed digital input sampling and deterministic interrupt latency. Operating from -40 C to +125 C, the isolator handles the wide industrial temperature range required for IEC 61131-2 PLC systems. Three channels per device allow dense packing of 16+ isolated channels on a 100 x 100 mm PLC backplane.
Recommended
Isolated RS-485 / RS-232 Segments
For isolated RS-485 or RS-232 nodes in factory networks, the SI8630AB-B-IS carries TX, RX, and direction-control signals between the UART and the bus transceiver, breaking ground loops between equipment powered from different phases or sources. The 2.5 kVrms isolation protects the host MCU from bus-side ESD and surge events per IEC 61000-4-2. With 35 kV/us CMTI, the isolator tolerates the large common-mode swings caused by motor-drive inverters and switching contactors on the factory floor, preserving data integrity across long cable runs.
Recommended
Medical Equipment Signal Isolation
The SI8630AB-B-IS provides patient-applied circuit isolation in medical devices per IEC 60601-1, isolating sensor inputs from the host controller with 2500 Vrms of galvanic isolation. Three forward channels accommodate ECG lead data, respiration signal, and a synchronization trigger between the patient front-end and the mainboard. The CMOS isolation technology eliminates the LED-aging concern of optocouplers, providing stable CTR-equivalent performance over the 10+ year service life of clinical equipment. The wide-body SOIC-16 package meets the 8 mm creepage required for 2 MOPP isolation.
Recommended
Isolated I2C Bus Bridge
For isolated I2C buses in battery-management or power-conversion systems, two SI8630AB-B-IS devices back-to-back (one in each direction) provide bidirectional SCL and SDA isolation. Three channels per device give headroom for SCL, SDA, and an interrupt or enable line in a single SOIC-16 footprint. The 1 Mbps speed comfortably covers Fast-Mode Plus (1 MHz) I2C, while 35 kV/us CMTI rejects switching noise from adjacent DC-DC converters. The 2.70-5.5 V supply on both sides lets the bus operate at 3.3 V on the MCU side and 5 V on the smart-battery side.
Recommended
Isolated Sensor Front-End Interface
In 4-20 mA loop-powered sensor transmitters, the SI8630AB-B-IS isolates the low-voltage microcontroller from the loop-powered ADC and modulator with 2500 Vrms isolation. Three channels accommodate SDO, SCLK, and a DRDY line from the isolated ADC back to the MCU, supporting data rates up to 1 Mbps. The -40 C to +125 C operating range handles outdoor and process-industry environments, while the CMOS digital-isolation technology avoids the LED-aging drift that would otherwise require periodic recalibration of the sensor.
Recommended
Recommended Products Summary
Engineering reference data for SI8630AB-B-IS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8630AB-B-IS1 | SI8631BB-B-IS | SI8632AB-B-IS | ISO7631FCDWR | ADuM1310ARWZ |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Texas Instruments | Analog Devices |
| Package | 16-SOIC wide-body (7.50 mm) | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same |
| Channel Configuration | 3/0 | 3/0 | 2/1 | 2/2 | 3/0 | 3/0 |
| Maximum Data Rate | 1 Mbps | 1 Mbps | 150 Mbps | 1 Mbps | 1 Mbps | 1 Mbps (low data rate) |
| Isolation Rating | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Supply Voltage Range | 2.70-5.5 V | 2.70-5.5 V | 2.70-5.5 V | 2.70-5.5 V | 2.70-5.5 V | 2.7-5.5 V |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Approx Unit Price (qty 1, USD) | 3.20 | 3.20 | 4.50 | 3.30 | 3.50 | 5.20 |
Key Differentiators
- Mature CMOS isolation with no LED aging (vs PC357N (optocoupler))
- 3 channels in single 16-SOIC (vs Discrete optocoupler array)
- 35 kV/us CMTI (vs ADuM1310ARWZ (25 kV/us typical))
Design Notes
Place 0.1 uF low-ESR ceramic bypass capacitors (X7R or X5R) within 2 mm of each VDD pin (pin 1 and pin 15) on both sides of the isolation barrier. Add a 1 uF bulk capacitor on each side if the upstream supply is shared with noisy switching nodes. The VDD supply range is 2.70-5.5 V; voltages below 2.7 V will trigger POR and channels will revert to default state. Estimated: total quiescent current at 5 V with all 3 channels active at 1 Mbps is approximately 4.8 mA (1.6 mA per channel x 3) per side.
The 16-SOIC wide-body (7.50 mm) package provides the 8 mm minimum creepage required by IEC 60747-17 and UL 1577 for 2.5 kVrms reinforced isolation. Do not place any traces, vias, or copper pours underneath the package body between pins 7-9 (GND1/GND2 region) - this area must be kept clear to maintain the isolation barrier. Maintain at least 8 mm clearance between side-1 and side-2 copper on outer PCB layers, and consider slotting the PCB under the device for higher isolation margins.
Do not connect side-1 and side-2 grounds together - they are galvanically isolated and must remain on separate ground domains. Tie the NC pins (pins 2, 8, 14, 16) to their respective side grounds or leave floating per datasheet; do not route signals to NC pins. The default output state on power-up is determined by the device variant; for applications requiring a known state during start-up, verify the Si8630AB default-high behavior in the datasheet and add external pull resistors if needed.
Compliance Information
RoHS compliant per Skyworks product page. Halogen-free status not explicitly stated in the provided web data. UL 1577 recognized at 2500Vrms. Not AEC-Q100 qualified - choose Si86xx-Q1 variants for automotive.
