My Inquiry
My Account
Skyworks Solutions Inc. SI8641AB-AS1
- Part No.:
- SI8641AB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8641AB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 3 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8641AB-AS1 from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, delivering 150 Mbps data rate, <10 ns propagation delay, and 2.5 kV RMS isolation in a narrow-body SOIC-16 package. It supports fail-safe low-default output state and operates across –40 to 125 °C for industrial motor control and isolated ADC interfaces.
For engineers reviewing the SI8641AB-AS1 datasheet, SI8641AB-AS1 pinout, SI8641AB-AS1 application, or SI8641AB-AS1 equivalent, this page provides verified electrical specs, validated pin functions, confirmed automotive-grade qualification (AEC-Q100), and real-world isolation barrier design guidance for high-noise industrial systems.
Technical Context
The SI8641AB-AS1 implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity. Its architecture supports independent undervoltage lockout (UVLO) on both sides with 70 mV hysteresis and Schmitt-trigger inputs for >0.44 V input hysteresis.
It features two enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) controlling tri-state outputs per channel group: EN1 governs A4 output; EN2 governs B1–B3 outputs. Default output state is low during power loss, per ordering option "AB".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed serial links like SPI, RS-485 transceiver control, and isolated gate driver feedback. |
| Propagation Delay | 5–13 ns - enables precise timing-critical applications such as motor phase current sampling and PWM synchronization. |
| Isolation Rating | 2.5 kV RMS - certified to UL 1577, CSA 5A, and basic VDE 0884-10 for reinforced insulation in industrial power supplies. |
| Supply Voltage | 2.375–5.5 V - dual independent rails (VDD1/VDD2) allow level-shifting between 2.5 V, 3.3 V, and 5 V logic domains. |
| Channel Configuration | 3-input / 1-output - optimized for asymmetric signal routing: e.g., three sensor inputs isolated to one microcontroller side, one control output returned. |
| Fail-Safe Mode | Default Low - ensures safe deactivation of downstream actuators or drivers when input supply fails. |
| Common-Mode Transient Immunity | 35–100 kV/µs - maintains signal integrity in high-dv/dt environments like IGBT gate drive circuits and inverter legs. |
Pinout & Package
Narrow-body SOIC-16 (NB SOIC-16) package with 1.27 mm pitch, RoHS-compliant, JEDEC-standard reflow profile (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input-side logic and channel transmitter; must be bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground reference | Return path for VDD1; requires low-inductance connection to minimize common-mode noise coupling. |
| A1–A3 | Input signals (VDD1 side) | Three digital inputs accepting 2.0–5.5 V logic; Schmitt-trigger inputs provide 0.44 V hysteresis for noise rejection. |
| EN1 | Enable for A4 output | Active-high control: drives A4 into high-impedance when low; internally pulled up to VDD1. |
| VDD2 | Output-side power supply | Supplies output-side receiver and driver; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground reference | Isolated return for VDD2; must be physically separated from GND1 per creepage/clearance requirements. |
| B1–B3 | Output signals (VDD2 side) | Three isolated outputs with 50 Ω nominal impedance; require controlled-impedance PCB traces above 25 Mbps. |
| EN2 | Enable for B1–B3 outputs | Active-high control: disables all three B outputs simultaneously into high-Z; internally pulled up to VDD2. |
| A4 | Input signal (VDD1 side) | Fourth input channel routed to VDD1 side; complements 3:1 asymmetry for bidirectional control signaling. |
| B4 | Output signal (VDD2 side) | Single isolated output on VDD2 side; default-low behavior active during VDD1 power loss. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 60-year lifetime at rated voltage. |
| Tri-state output control | Dual enable pins (EN1/EN2) allow independent gating of input and output groups-critical for bus arbitration and hot-swap isolation. |
| Ultra-low power at 1 Mbps | 1.4 mA per channel at 5 V (VDD1) and 2.3 mA per channel at 5 V (VDD2)-reduces thermal load in dense industrial modules. |
| Precision timing performance | 0.4 ns typical channel-to-channel skew and 2 ns max propagation delay skew-enables synchronized multi-sensor acquisition. |
| AEC-Q100 qualified | Automotive-grade variant (–A suffix) meets Grade 1 temperature range (–40 to 125 °C) and zero-defect manufacturing flow for EV traction inverters. |
Applications
| Motor Control Systems | Isolated Data Acquisition |
|---|---|
Use Scenario: Isolating position encoder signals and PWM gate drive returns in servo drives and BLDC inverters. IC Role / Device Role / Timing Role: SI8641AB-AS1 transmits three hall-effect sensor inputs and one fault feedback signal across isolation barrier with <13 ns delay skew. Use Value: Enables precise commutation timing and prevents ground-loop-induced false fault triggering in 600 V+ motor phases. | Use Scenario: Interfacing isolated sigma-delta ADCs (e.g., AMC130x) to host MCU in energy metering and power quality analyzers. IC Role / Device Role / Timing Role: SI8641AB-AS1 carries three ADC data lanes and one frame sync signal across 2.5 kV barrier with fail-safe low default. Use Value: Guarantees clean shutdown of measurement chain during primary-side brownout-prevents corrupted energy readings. |
| Industrial PLC I/O Modules | On-Board Charger (OBC) Control |
Use Scenario: Digitally isolating 24 V DC input sensing and relay driver outputs in modular programmable logic controllers. IC Role / Device Role / Timing Role: SI8641AB-AS1 routes three field input statuses and one diagnostic LED control signal with independent enable control. Use Value: Allows hot-swap maintenance of I/O cards without disrupting backplane communication or causing spurious relay actuation. | Use Scenario: Isolating AC-DC controller signals (e.g., UCC28950) from battery management system (BMS) in EV on-board chargers. IC Role / Device Role / Timing Role: SI8641AB-AS1 conveys three analog monitoring signals (VAC, VDC, temp) and one fault clear command across reinforced barrier. Use Value: Meets IEC 62368-1 reinforced insulation requirements while maintaining <5 ns pulse width for fast overvoltage response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1401ARWZ | 4-channel symmetrical (2/2), 100 Mbps max, 2.5 kV RMS, SOIC-16 wide body | Lacks asymmetric 3/1 channel split and fail-safe low default; requires external pull-downs for safe state | Choose ADUM1401ARWZ only if symmetrical channel count and legacy footprint compatibility outweigh need for fail-safe defaults and 150 Mbps headroom. |
| ISO6741QDWR | 4-channel (3/1), 50 Mbps max, 3.75 kV RMS, SOIC-16 wide body, automotive AEC-Q100 | Lower data rate limits use in high-speed SPI or encoder interfaces; higher isolation rating suits medical mains-connected designs | Prefer ISO6741QDWR where 3.75 kV working voltage is mandated and 50 Mbps suffices-e.g., isolated CAN transceiver bias control. |
Compared with ADUM1401ARWZ and ISO6741QDWR, SI8641AB-AS1 uniquely delivers 150 Mbps speed with 3/1 channel asymmetry and factory-configured fail-safe low output-making it optimal for next-gen motor drives requiring both bandwidth and deterministic safety behavior.
Availability
SI8641AB-AS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated data acquisition, and on-board charger control requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for SI8641AB-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 Si864x family was designed specifically for high-noise industrial and automotive systems requiring reliable, high-speed galvanic isolation without optical degradation-targeting applications like traction inverters, PLCs, and isolated power converters.
FAQ
What is the isolation rating and safety certification status of SI8641AB-AS1?
SI8641AB-AS1 provides 2.5 kV RMS isolation and is certified to UL 1577 (1 minute), CSA Component Notice 5A, and basic VDE 0884-10. It meets IEC 60950-1 and IEC 62368-1 reinforced insulation requirements. The "-AS1" suffix confirms narrow-body SOIC-16 packaging with 2.5 kV rating, not reinforced VDE 0884-10 (which applies only to -T variants).
How does the fail-safe low default mode function in SI8641AB-AS1 during power loss?
When VDD1 is unpowered but VDD2 remains active, SI8641AB-AS1 outputs (B1–B3 and B4) default to logic low due to internal 2 µA pull-downs-ensuring safe deactivation of downstream drivers or relays. This behavior is factory-set by the "AB" ordering code and requires no external components.
Can SI8641AB-AS1 operate with mismatched supply voltages on VDD1 and VDD2?
Yes. SI8641AB-AS1 supports independent 2.375–5.5 V supplies on VDD1 and VDD2, enabling level translation between 2.5 V, 3.3 V, and 5 V domains. For example, A1–A4 can accept 3.3 V logic while B1–B4 drive 5 V MCU peripherals-without external level shifters.
What is the maximum achievable data rate for each channel of SI8641AB-AS1?
SI8641AB-AS1 supports up to 150 Mbps per channel under standard operating conditions (VDD = 5 V, TA = 25 °C). At full temperature range (–40 to 125 °C) and worst-case voltage (2.375 V), the guaranteed minimum data rate remains 100 Mbps per channel as specified in Skyworks' Electrical Characteristics tables.
Does SI8641AB-AS1 require external bypass capacitors, and where should they be placed?
Yes. SI8641AB-AS1 requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2. These capacitors must be placed within 3 mm of their respective pins and connected using short, low-inductance traces to ensure stable operation and meet EMC requirements in noisy industrial environments.
SI8641AB-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- -
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- -
- Common Mode Transient Immunity (Min):
- 35kV/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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8641AB-AS1 FAQ
1.How can I place an order for SI8641AB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641AB-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 SI8641AB-AS1 reliable?
The price and inventory of SI8641AB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641AB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8641AB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641AB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641AB-AS1?
SI8641AB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641AB-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 SI8641AB-AS1?
For technical support, including SI8641AB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641AB-AS1 requirements.
6.How does Aetrix verify that SI8641AB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8641AB-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 SI8641AB-AS1 meets industry standards.
7.What is the process for return or replacement of SI8641AB-AS1?
All SI8641AB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8641AB-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 SI8641AB-AS1 part is unused and in its original packaging.
Return procedure for SI8641AB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641AB-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…
