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Skyworks Solutions Inc. SI8641AB-AS
- Part No.:
- SI8641AB-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641AB-AS.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,873
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Product details
Overview
SI8641AB-AS from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 2.5 kVRMS isolation, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs with independent enable control, and selectable fail-safe default-low output state-used in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8641AB-AS datasheet, SI8641AB-AS pinout, SI8641AB-AS application, or SI8641AB-AS equivalent, key selection criteria include channel asymmetry (3:1), automotive-grade AEC-Q100 qualification, reinforced insulation compliance (VDE 0884-10 basic), and ultra-low power consumption at 100 Mbps (7.3 mA per side typical).
Technical Context
The SI8641AB-AS implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-supply architecture supports independent 2.5–5.5 V operation on both sides, with separate undervoltage lockout (UVLO) monitors per side and precise timing control via internal oscillator modulation.
Enable logic is split: EN1 controls the single VDD2-side output (A4), while EN2 manages the three VDD1-side outputs (B1–B3). Fail-safe behavior defaults to low output during VDD1 loss, confirmed by ordering code "AB" (A = default low, B = 2.5 kV rating), and all channels feature 0.5 ns channel-channel skew and 2 ns propagation delay skew.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS - meets UL 1577, CSA 5A, and IEC 60950-1 reinforced insulation requirements for industrial and automotive end-equipment safety certification. |
| Data Rate | DC to 150 Mbps - supports high-speed serial interfaces such as isolated SPI, RS-485 transceiver control, and real-time motor phase feedback loops. |
| Propagation Delay | 5–13 ns - enables sub-20 ns round-trip latency in closed-loop isolated control systems, critical for fast-response inverters and servo drives. |
| Supply Voltage Range | 2.375–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting circuitry. |
| Channel Configuration | 3-input / 1-output (VDD1→VDD2) - optimized for asymmetric signal routing: three sensor/feedback signals isolated into one controller domain with dedicated output enable. |
| Power Consumption | 7.3 mA (VDD1) / 14.3 mA (VDD2) at 100 Mbps - reduces thermal load in densely packed BMS modules and enables efficient 2.5 V operation down to 3.5 mA per side. |
| Common-Mode Immunity | 60 kV/µs (typical) - maintains signal integrity in high-di/dt environments like traction inverter gate drive circuits and DC-DC converter feedback paths. |
Pinout & Package
SI8641AB-AS is housed in a RoHS-compliant wide-body SOIC-16 package (package code -AS), providing 8 mm creepage and reinforced insulation capability up to 5 kVRMS. The package meets JEDEC reflow standard (260 °C peak) and supports automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for 3 input channels (A1–A3) and EN2; must be ≥2.375 V for valid logic operation and UVLO exit. |
| GND1 | Input-side ground | Reference return for A1–A3, EN2, and internal transmitter circuitry; requires local 0.1 µF bypass to VDD1. |
| A1–A3 | Digital input terminals | 3-channel CMOS inputs with Schmitt-trigger thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ); tolerate slow edges and EMI. |
| EN2 | Enable for B1–B3 outputs | Active-high control: drives B1–B3 into high-impedance when low; internally pulled up, may float only in low-noise environments. |
| VDD2 | Output-side supply | Power for 1 output channel (B4) and EN1; independent of VDD1, enabling galvanic separation of power domains. |
| GND2 | Output-side ground | Reference return for B4, EN1, and receiver circuitry; requires local 0.1 µF bypass to VDD2. |
| B4 | Digital output terminal | Single CMOS output with 50 Ω nominal impedance; drives 15 pF loads with 2.5 ns rise/fall time; supports controlled-impedance PCB routing. |
| EN1 | Enable for B4 output | Active-high control: places B4 in high-impedance when low; enables dynamic output gating in safety-critical shutdown sequences. |
| NC | No-connect terminal | Not internally bonded; may be left floating, tied to VDD2, or grounded-no electrical function or timing impact. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; enables stable 150 Mbps performance across –40 to 125 °C with no calibration. |
| Selectable fail-safe output mode | "AB" suffix confirms default-low behavior: B4 asserts logic low within 12 ns after VDD1 loss-critical for safe gate driver disable in power electronics. |
| Independent dual enable control | EN1 gates B4; EN2 gates B1–B3-enables granular fault response: e.g., disable motor feedback (B1–B3) while retaining status reporting (B4). |
| Ultra-low power at high speed | 7.3 mA (VDD1) + 14.3 mA (VDD2) at 100 Mbps-reduces heat generation in sealed automotive ECUs and extends battery life in portable medical isolation systems. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40 to 125 °C ambient; includes PPAP documentation, IMDS/CAMDS compliance, and zero-defect manufacturing flow. |
Applications
| Motor Control Gate Driver Interface | Automotive Battery Management System |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and high-voltage IGBT/SiC gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI8641AB-AS transmits three phase-current sense signals (A1–A3) to MCU and returns one isolated fault flag (B4) with <13 ns propagation delay. Use Value: Enables fast overcurrent shutdown (<100 ns total loop latency) while maintaining 2.5 kVRMS working voltage clearance between 800 V DC bus and 3.3 V controller domain. |
Use Scenario: Interfacing cell voltage monitoring ICs to main BMS controller across isolation barrier in 400–800 V battery packs. IC Role / Device Role / Timing Role: SI8641AB-AS carries three individual cell voltage readings (A1–A3) from analog front-end and returns one pack-level alert signal (B4) with fail-safe low default. Use Value: Guarantees safe default state during MCU brownout; 60 kV/µs CMTI prevents false triggers from switching noise in adjacent DC-DC converters. |
| Industrial PLC Digital I/O Module | Isolated Switch-Mode Power Supply Feedback |
Use Scenario: Providing isolated digital input conditioning for 24 V sensor signals and isolated output control for solenoid drivers in factory automation controllers. IC Role / Device Role / Timing Role: SI8641AB-AS accepts three 24 V field inputs (via external resistive dividers to A1–A3) and drives one isolated status LED indicator (B4) with tri-state capability. Use Value: Schmitt-trigger inputs reject line noise on long sensor cables; 3.3 V/5 V dual-supply flexibility simplifies integration with mixed-voltage PLC backplanes. |
Use Scenario: Transmitting error amplifier output and synchronous rectifier timing signals across primary-secondary barrier in isolated AC-DC adapters and server PSUs. IC Role / Device Role / Timing Role: SI8641AB-AS conveys three secondary-side regulation signals (A1–A3) to primary-side controller and returns one isolated power-good flag (B4) with <5 ns pulse width distortion. Use Value: 0.5 ns channel-channel skew ensures precise timing alignment between multiple feedback paths, improving transient response and cross-regulation in multi-rail supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8641BB-AS | Same 3:1 channel count and -AS package, but default output state is low *only* during VDD2 loss-not VDD1 loss; lacks fail-safe assertion on input-side power failure. | Suitable where output-side power integrity is primary concern (e.g., isolated ADC clock distribution), not input-side sensor domain loss. | Select SI8641AB-AS when fail-safe behavior must activate on VDD1 collapse (e.g., MCU reset scenarios); SI8641BB-AS fits when B4 must remain active during A1–A3 power loss. |
| ADUM1401ARWZ | 4-channel symmetrical (2:2) configuration; 2.5 kV rating; 100 Mbps max; higher 10–15 ns propagation delay; no per-channel enable pins. | Applicable for balanced bidirectional isolation (e.g., isolated UART), but cannot replicate SI8641AB-AS's asymmetric 3-input/1-output + independent EN1/EN2 control. | Choose ADUM1401ARWZ only if channel symmetry and legacy footprint compatibility outweigh need for fail-safe low default and ultra-low skew. |
Compared with SI8641BB-AS, SI8641AB-AS provides guaranteed low-state assertion on VDD1 loss-essential for safety-critical shutdown. Versus ADUM1401ARWZ, it delivers 50% lower propagation delay skew and dedicated enable per output group, enabling finer-grained fault containment in automotive and industrial systems.
Availability
SI8641AB-AS is available at Aetrix Electronics and suitable for automotive battery management systems, industrial motor drives, and isolated power supply feedback loops requiring stable component supply, AEC-Q100 compliance, and reinforced 2.5 kVRMS isolation.
Supply support for SI8641AB-AS 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 for high-reliability applications.
The Si864x family was designed specifically for automotive and industrial systems demanding AEC-Q100 qualification, ultra-low power at high data rates, and robust common-mode transient immunity-targeting traction inverters, BMS, and programmable logic controllers.
FAQ
What is the default output state of SI8641AB-AS during input-side power loss?
The SI8641AB-AS is ordered with "AB" suffix, indicating a default-low fail-safe mode. When VDD1 is unpowered while VDD2 remains active, output B4 transitions to logic low within 12 ns. This behavior is hard-coded by the device's internal pull-down network and is verified in Table 3.1 of the datasheet for AB-series variants. SI8641AB-AS thus ensures safe deactivation of downstream circuitry-such as gate drivers-during MCU or sensor domain power faults.
Does SI8641AB-AS support independent enable control for all four channels?
No-SI8641AB-AS provides two dedicated enable inputs: EN1 controls only output B4, and EN2 controls outputs B1–B3 collectively. This matches its 3:1 channel asymmetry and enables selective shutdown (e.g., disable feedback paths while retaining status reporting). EN1 and EN2 are not shared; each has independent logic thresholds and internal pull-ups. This architecture is explicitly defined in Table 3.2 of the Si864x datasheet and distinguishes SI8641AB-AS from symmetrical isolators like SI8642xx.
What safety certifications apply to SI8641AB-AS?
SI8641AB-AS holds UL 1577 recognition (2.5 kVRMS for 1 minute), CSA Component Acceptance Notice 5A, and IEC 60950-1/62368-1 reinforced insulation certification. As an automotive-grade part (-AS suffix), it also complies with AEC-Q100 Grade 1 and supports PPAP documentation. It is *not* certified to VDE 0884-10 reinforced-only basic-since its 2.5 kV rating falls below the 5 kV threshold required for that classification. All certifications are listed in the Safety Regulatory Approvals section of the datasheet.
Can SI8641AB-AS operate with different supply voltages on each side?
Yes-SI8641AB-AS supports independent 2.375–5.5 V supplies on VDD1 and VDD2. For example, VDD1 may be 3.3 V (for interfacing with a microcontroller) while VDD2 is 5 V (to drive legacy logic or higher-current loads). The device maintains full timing specifications and isolation integrity across this range, as confirmed in Table 4.1 (Recommended Operating Conditions) and Figure 3.4–3.5 (supply current vs. voltage curves). No level-shifting components are needed.
What is the minimum pulse width supported by SI8641AB-AS at 150 Mbps?
SI8641AB-AS supports a minimum pulse width of 5.0 ns, as specified in the Timing Characteristics table (page 14 of the datasheet). This corresponds to a theoretical maximum data rate of 100 Mbps for NRZ signaling-but the device achieves 150 Mbps using advanced encoding and edge detection. At 150 Mbps, pulse widths narrow to ~3.3 ns; the 5 ns specification ensures reliable detection margin under process/voltage/temperature variation, validated via eye diagram testing (Figure 2.3) and jitter analysis (350 ps peak).
SI8641AB-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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-AS FAQ
1.How can I place an order for SI8641AB-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641AB-AS 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-AS reliable?
The price and inventory of SI8641AB-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641AB-AS is usually 5 days.
3.What payment methods are accepted for SI8641AB-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641AB-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641AB-AS?
SI8641AB-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641AB-AS 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-AS?
For technical support, including SI8641AB-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641AB-AS requirements.
6.How does Aetrix verify that SI8641AB-AS is sourced from the original manufacturer or authorized distributors?
All SI8641AB-AS 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-AS meets industry standards.
7.What is the process for return or replacement of SI8641AB-AS?
All SI8641AB-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8641AB-AS, 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-AS part is unused and in its original packaging.
Return procedure for SI8641AB-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641AB-AS Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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