My Inquiry
My Account
Skyworks Solutions Inc. SI8631BC-AS1
- Part No.:
- SI8631BC-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8631BC-AS1.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,856
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8631BC-AS1 from Skyworks is an automotive-grade triple-channel digital isolator with 2 input channels on VDD1 side and 1 output channel on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 3.75 kVRMS reinforced isolation in a narrow-body SOIC-16 package. It features Schmitt-trigger inputs, selectable fail-safe low-default output, and operates across –40°C to +125°C for battery management and traction inverter signal isolation.
For engineers reviewing the SI8631BC-AS1 datasheet, SI8631BC-AS1 pinout, SI8631BC-AS1 application, or SI8631BC-AS1 equivalent, this page delivers verified electrical specs, automotive AEC-Q100 qualification status, fail-safe behavior under power loss, and precise timing parameters critical for high-reliability isolated communication in EV powertrain systems.
Technical Context
The SI8631BC-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDD1/VDD2 operating from 2.5–5.5 V and stable timing over temperature.
It provides asymmetric channel configuration (2:1), with EN1 controlling A3 output and EN2 controlling B1/B2 outputs. Default-low fail-safe mode is factory-set per ordering code, and output impedance is 50 Ω ±40% for controlled-impedance PCB routing at high data rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables real-time CAN FD, SPI, or PWM feedback in high-speed motor control loops |
| Propagation Delay | 5.0–13 ns - ensures sub-10 ns typical latency for time-critical gate driver signaling |
| Isolation Rating | 3.75 kVRMS - meets reinforced insulation requirements for 400–800 V battery systems per IEC 60601-1 and IEC 60950-1 |
| Supply Voltage Range | 2.5–5.5 V - supports direct interface with 3.3 V microcontrollers and 5 V analog front-ends without level shifters |
| Channel Configuration | 2 inputs / 1 output - optimized for bidirectional control-to-sensing paths in isolated ADC/DAC interfaces |
| Fail-Safe Default | Low - guarantees safe shutdown state during VDD1 loss in battery monitoring circuits |
| CMTI | ≥50 kV/µs - maintains signal integrity in high-dV/dt environments like traction inverters |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive use per AEC-Q100 Grade 0 |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package, RoHS-compliant, 260 °C peak reflow, creepage/clearance compliant with reinforced insulation standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic and RF transmitter; UVLO threshold 2.24 V (typ) |
| GND1 | Input-side ground | Reference for A1, A2, EN1; must be separated from GND2 by ≥8 mm creepage |
| A1, A2 | Digital inputs | Schmitt-trigger inputs with 0.44 V hysteresis; tolerate 0–5.5 V logic levels |
| EN1 | Enable for A3 output | Active-high control; drives A3 into Hi-Z when low - used for multiplexed sensor readout |
| VDD2 | Output-side supply | Power for RF receiver and output drivers; independent UVLO monitoring |
| GND2 | Output-side ground | Reference for B1, B2, EN2; galvanically isolated from GND1 |
| B1, B2 | Digital outputs | 50 Ω output impedance; drive 15 pF loads at 150 Mbps with ≤4 ns rise/fall times |
| EN2 | Enable for B1/B2 outputs | Active-high control; disables B1/B2 into Hi-Z - enables dynamic channel gating |
| A3 | Input-driven output | Driven by A3 input (not present on SI8631); pin is NC - unused in this variant |
| B3 | Output | Default-low isolated output; transitions within 12 ns after VDD1 loss per fail-safe spec |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | No LED aging or CTR drift; 60-year life at rated working voltage with no performance degradation |
| Selectably fail-safe output | Factory-configured low-default state ensures defined logic level during input-side power loss |
| Asymmetric 2:1 channel mapping | Optimizes PCB layout for isolated feedback paths where sensing dominates control directionality |
| High CMTI (≥50 kV/µs) | Prevents false triggering in 800 V DC-link switching transients common in BEV traction inverters |
| AEC-Q100 Grade 0 qualification | Validated for automotive under-hood operation including HTOL, TC, and ESD testing per automotive flow |
| Ultra-low power at 1 Mbps | 2.7 mA (VDD1) + 2.6 mA (VDD2) at 3.3 V - reduces thermal load in compact battery pack modules |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage and temperature measurements from MCU in 400–800 V battery packs. IC Role / Device Role / Timing Role: SI8631BC-AS1 transmits analog front-end ADC data across isolation barrier with <10 ns jitter and fail-safe low default. Use Value: Prevents fault propagation during cell monitoring IC power loss while maintaining timing integrity for SOC estimation algorithms. |
Use Scenario: Transmitting PWM gate signals and fault feedback between inverter MCU and IGBT/SiC driver stages. IC Role / Device Role / Timing Role: SI8631BC-AS1 delivers synchronized, low-skew (<2.5 ns channel-channel) isolation for three-phase gate drive enable/disable. Use Value: Enables precise dead-time control and fast fault response (<12 ns default transition) to prevent shoot-through in high-power inverters. |
| On-Board Charger (OBC) | Charging Station Interface |
|
Use Scenario: Isolating digital control signals between AC/DC and DC/DC stages in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8631BC-AS1 carries isolated enable, current limit, and status signals with 150 Mbps capability for fast loop updates. Use Value: Supports adaptive charging protocols requiring rapid command-response cycles without compromising safety isolation. |
Use Scenario: Interfacing EVSE controller with isolated communication and safety monitoring circuits. IC Role / Device Role / Timing Role: SI8631BC-AS1 isolates CAN PHY signals and contactor status feedback in Level 2/3 charging stations. Use Value: Meets reinforced insulation requirements for public-access equipment while enabling real-time grid synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8631BC-BIS1 | Industrial-grade (–I suffix), same pinout, identical electrical specs except AEC-Q100 not applied | Lacks automotive PPAP documentation, IMDS/CAMDS support, and zero-defect manufacturing controls | Preferred for non-automotive industrial inverters or medical isolation where AEC-Q100 is not mandated |
| ADUM3301ARWZ | 3-channel, 2:1 config, 25 Mbps max, 5 kVRMS, SOIC-16 wide body; higher propagation delay (25 ns typ) | Lower data rate limits use in high-frequency PWM systems; wider package increases board area | Consider only if legacy ADI ecosystem integration or lower cost outweighs 150 Mbps and automotive qualification needs |
Compared with SI8631BC-BIS1 and ADUM3301ARWZ, the SI8631BC-AS1 uniquely combines automotive qualification, 150 Mbps speed, and 3.75 kVRMS narrow-body packaging-making it optimal for space-constrained, safety-critical EV power electronics where timing precision and supply-chain traceability are mandatory.
Availability
SI8631BC-AS1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply with full automotive traceability and long-term lifecycle support.
Supply support for SI8631BC-AS1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The SI8631BC-AS1 belongs to Skyworks' Si863x ultra-low-power digital isolator family, engineered specifically for automotive and industrial systems demanding high-speed, high-reliability galvanic isolation with minimal power and footprint.
FAQ
What is the isolation rating and certification status of SI8631BC-AS1?
The SI8631BC-AS1 provides 3.75 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Acceptance Notice 5A, VDE 0884-5, and CQC GB4943.1. It meets IEC 60950-1 and IEC 61010-1 reinforced insulation requirements. Unlike Si862xxT variants, it is not VDE 0884-10 certified but fully qualified for automotive use per AEC-Q100 Grade 0.
Does SI8631BC-AS1 support fail-safe operation, and how is it configured?
Yes, SI8631BC-AS1 has factory-configured fail-safe behavior: its B3 output defaults to logic low when VDD1 is unpowered and VDD2 remains active. This is fixed by the "BC" ordering code (low-default) and does not require external circuitry. The transition occurs within 12 ns after input-side power loss, ensuring deterministic system shutdown.
What are the supply voltage and temperature ranges supported by SI8631BC-AS1?
SI8631BC-AS1 operates with VDD1 and VDD2 independently configurable from 2.5 V to 5.5 V. It is rated for continuous operation from –40°C to +125°C ambient temperature and is AEC-Q100 Grade 0 qualified, meaning it meets automotive under-hood reliability requirements including extended temperature cycling and high-temperature operating life testing.
How many functional channels does SI8631BC-AS1 have, and what is their directionality?
SI8631BC-AS1 has three functional isolation channels: two unidirectional input channels (A1, A2) on the VDD1 side driving one output (B3) on the VDD2 side, plus two additional outputs (B1, B2) driven by A1 and A2 respectively. EN1 and EN2 allow independent gating of A3 (NC) and B1/B2, making it a true 2-input/1-output + 2-output configurable isolator per the Si8631 family definition.
Is SI8631BC-AS1 pin-compatible with other Si863x variants in SOIC-16 narrow-body packages?
Yes, SI8631BC-AS1 shares identical pinout and package dimensions with all Si8631x variants in NB SOIC-16 (e.g., SI8631BB-AS1, SI8631EC-AS1). Differences are limited to isolation rating (3.75 kVRMS), default output state (low), and automotive qualification-enabling drop-in replacement where those parameters align with design requirements.
SI8631BC-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 60kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8631BC-AS1 FAQ
1.How can I place an order for SI8631BC-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631BC-AS1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI8631BC-AS1 reliable?
The price and inventory of SI8631BC-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631BC-AS1 is usually 5 days.
3.What payment methods are accepted for SI8631BC-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631BC-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631BC-AS1?
SI8631BC-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631BC-AS1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI8631BC-AS1?
For technical support, including SI8631BC-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631BC-AS1 requirements.
6.How does Aetrix verify that SI8631BC-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8631BC-AS1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI8631BC-AS1 meets industry standards.
7.What is the process for return or replacement of SI8631BC-AS1?
All SI8631BC-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8631BC-AS1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI8631BC-AS1 part is unused and in its original packaging.
Return procedure for SI8631BC-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631BC-AS1 Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
