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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8640BD-AS

Name: SI8640BD-AS
Brand: Skyworks Solutions Inc.
SKU: SI8640BD-AS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8640BD-AS

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: SI8640BD-AS.pdf

Description:: AUTOMOTIVE 5 KV 4-CHANNEL DIGITA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8640BD-AS from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, rated for 5.0 kV_RMS reinforced isolation, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs with single enable control (EN), selectable low-default fail-safe mode, and ultra-low power consumption (1.6 mA/channel @ 1 Mbps, 5 V).

For engineers reviewing the SI8640BD-AS datasheet, SI8640BD-AS pinout, SI8640BD-AS application, or SI8640BD-AS equivalent, key selection considerations include its wide-body SOIC-16 package with 8 mm creepage, AEC-Q100 automotive qualification, VDE 0884-10 reinforced certification, and precise timing specs (8 ns typical propagation delay, 0.5 ns channel-channel skew).

Technical Context

The SI8640BD-AS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing superior noise immunity over optocouplers. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).

All four channels are input-only on Side A (VDD1), output-only on Side B (VDD2); EN is located on Side B and controls all four outputs simultaneously. The device operates across 2.5–5.5 V supplies and maintains stable timing performance (±0.5 ns skew) over temperature and voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	DC to 150 Mbps - supports high-speed serial interfaces including SPI, RS-485, and isolated ADC/DAC links without timing bottlenecks.
Isolation Rating	5.0 kV_RMS reinforced - certified to VDE 0884-10 and UL 1577, enabling use in medical (IEC 60601-1) and industrial safety-critical systems.
Propagation Delay	8.0 ns (typ) - ensures sub-10 ns latency for real-time motor control feedback loops and fast-switching power supply monitoring.
Channel-Channel Skew	0.5 ns (typ) - guarantees tight synchronization across all four isolated signals, critical for multi-phase gate driver timing.
Supply Current	1.6 mA per channel @ 1 Mbps, 5 V - reduces thermal load and enables battery-backed or energy-harvested isolated sensing nodes.
Common-Mode Transient Immunity	60 kV/µs (typ) - suppresses switching noise from IGBTs/MOSFETs in inverters and traction drives without signal corruption.
Fail-Safe Default	Low - output pins drive logic low during VDD1 loss while VDD2 remains powered, preventing undefined states in safety-shutdown circuits.

Pinout & Package

SI8640BD-AS uses a 16-pin wide-body SOIC package (WB SOIC-16) with 8 mm creepage distance, RoHS-compliant, JEDEC-standard 260 °C reflow profile.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Input-side power supply	2.5–5.5 V supply for input logic and RF transmitter; bypassed with 0.1 µF capacitor near pin.
GND1	Input-side ground reference	Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for reinforced isolation compliance.
INA1–INA4	Input channels A1–A4	Schmitt-trigger inputs accepting 2.0–5.5 V logic; no external pull-up/down required due to internal fail-safe biasing.
VDD2	Output-side power supply	2.5–5.5 V supply for RF receiver and output drivers; independent of VDD1 for galvanic separation.
GND2	Output-side ground reference	Return path for VDD2; forms isolation barrier with GND1; requires physical PCB separation per safety standards.
EN	Enable control input	Active-high control on Side B; drives all four outputs into high-impedance when low, enabling bus sharing or power-gating.
OUTB1–OUTB4	Output channels B1–B4	CMOS-compatible outputs with 50 Ω nominal impedance; support 4 mA sink/source at 0.4 V VOL / 4.8 V VOH (5 V).

Key Features

Feature	Design Value
RF-based isolation barrier	Eliminates LED aging and temperature drift issues of optocouplers; enables >60-year lifetime at rated working voltage.
Tri-state outputs with single EN	Reduces system-level component count vs. discrete enable logic; simplifies bus arbitration in isolated communication backplanes.
Reinforced VDE 0884-10 certification	Validates 10 kV surge capability and long-term reliability for medical and EV traction inverter applications.
AEC-Q100 Grade 0 qualification	Guarantees operation from –40 to 125 °C ambient with zero-defect manufacturing flow for automotive battery management and OBC systems.
Ultra-low 1.6 mA/channel @ 1 Mbps	Enables integration into thermally constrained modules (e.g., compact inverters) without derating or forced cooling.

Applications

Motor Control Feedback	Isolated ADC Interface
Use Scenario: Isolating encoder, resolver, or current-sense signals from gate driver ICs in 3-phase inverter stages. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting position/speed data and analog-to-digital conversion results across high dv/dt barriers. Use Value: 0.5 ns channel-channel skew ensures synchronized sampling of phase currents, improving FOC algorithm accuracy and reducing torque ripple.	Use Scenario: Connecting isolated sigma-delta modulators (e.g., AMC1306) to MCU ADC inputs in industrial PLC analog input modules. IC Role / Device Role / Timing Role: High-CMTI digital isolator preserving bitstream integrity between modulator and controller under 50 kV/µs transients. Use Value: 60 kV/µs CMTI prevents bit errors during IGBT switching, maintaining ±0.1% measurement linearity in 16-bit precision systems.
Battery Management System	Traction Inverter Control
Use Scenario: Isolating cell voltage monitoring and balancing signals between battery pack and central BMS controller in EV platforms. IC Role / Device Role / Timing Role: Automotive-grade quad isolator with fail-safe low default, ensuring safe shutdown state during pack-level power loss. Use Value: AEC-Q100 Grade 0 rating and reinforced 5 kV_RMS isolation meet ISO 26262 ASIL-D functional safety requirements for HV battery monitoring.	Use Scenario: Transmitting PWM commands from MCU to isolated gate drivers in 800 V traction inverters with SiC MOSFETs. IC Role / Device Role / Timing Role: Low-propagation-delay isolator delivering synchronized gate signals with <8 ns delay and <2 ns skew across phases. Use Value: Sub-10 ns timing enables precise dead-time control and minimizes shoot-through risk in high-frequency (>20 kHz) switching topologies.

Motor Control Feedback

Isolated ADC Interface

Use Scenario: Isolating encoder, resolver, or current-sense signals from gate driver ICs in 3-phase inverter stages.

IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting position/speed data and analog-to-digital conversion results across high dv/dt barriers.

Use Value: 0.5 ns channel-channel skew ensures synchronized sampling of phase currents, improving FOC algorithm accuracy and reducing torque ripple.

Use Scenario: Connecting isolated sigma-delta modulators (e.g., AMC1306) to MCU ADC inputs in industrial PLC analog input modules.

IC Role / Device Role / Timing Role: High-CMTI digital isolator preserving bitstream integrity between modulator and controller under 50 kV/µs transients.

Use Value: 60 kV/µs CMTI prevents bit errors during IGBT switching, maintaining ±0.1% measurement linearity in 16-bit precision systems.

Battery Management System

Traction Inverter Control

Use Scenario: Isolating cell voltage monitoring and balancing signals between battery pack and central BMS controller in EV platforms.

IC Role / Device Role / Timing Role: Automotive-grade quad isolator with fail-safe low default, ensuring safe shutdown state during pack-level power loss.

Use Value: AEC-Q100 Grade 0 rating and reinforced 5 kV_RMS isolation meet ISO 26262 ASIL-D functional safety requirements for HV battery monitoring.

Use Scenario: Transmitting PWM commands from MCU to isolated gate drivers in 800 V traction inverters with SiC MOSFETs.

IC Role / Device Role / Timing Role: Low-propagation-delay isolator delivering synchronized gate signals with <8 ns delay and <2 ns skew across phases.

Use Value: Sub-10 ns timing enables precise dead-time control and minimizes shoot-through risk in high-frequency (>20 kHz) switching topologies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM4400ARWZ	4-channel, 5 kV_RMS, 100 Mbps max, 12 ns propagation delay, non-automotive grade	Lacks AEC-Q100 qualification and VDE 0884-10 reinforced certification; suitable for industrial but not automotive BMS	Select when cost sensitivity outweighs automotive qualification and higher speed is unnecessary.
ISO6741QDWR	4-channel, 5 kV_RMS, 50 Mbps max, 25 ns propagation delay, AEC-Q100 qualified	Lower data rate and slower timing limit use in high-speed motor control or fast ADC interfaces	Select when system bandwidth ≤50 Mbps and extended temperature range is required without premium speed.

Compared with ADUM4400ARWZ and ISO6741QDWR, SI8640BD-AS uniquely combines AEC-Q100 Grade 0, 150 Mbps speed, 8 ns propagation delay, and VDE 0884-10 reinforced certification-making it the only option qualified for safety-critical, high-bandwidth automotive traction and battery systems.

Availability

SI8640BD-AS is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and isolated industrial ADC interfaces requiring stable component supply across automotive and industrial production lifecycles.

Supply support for SI8640BD-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.

The Si864x family was designed specifically for automotive and industrial systems demanding reinforced isolation, AEC-Q100 qualification, and sub-10 ns timing-targeting EV powertrain, renewable energy inverters, and medical equipment.

FAQ

What is the isolation rating and safety certification of SI8640BD-AS?

SI8640BD-AS provides 5.0 kV_RMS reinforced isolation and is certified to UL 1577, CSA Component Notice 5A, IEC 60950-1/62368-1/60601-1, VDE 0884-10 (reinforced), and CQC GB4943.1. These certifications validate its use in medical, industrial, and automotive safety-critical designs where reinforced insulation is mandated.

Does SI8640BD-AS require external pull-up or pull-down resistors on its inputs or outputs?

No. SI8640BD-AS has internal fail-safe biasing: for low-default variants like SI8640BD-AS, 2 µA pull-downs are integrated on all input/output channels. This eliminates external resistors, reduces BOM count, and ensures deterministic logic states during power transitions without additional components.

How does the enable (EN) pin function on SI8640BD-AS?

The EN pin on SI8640BD-AS is an active-high control on the output side (VDD2) that simultaneously places all four outputs (OUTB1–OUTB4) into high-impedance state when driven low. When EN is high or floating (internally pulled up), outputs follow their respective inputs. This enables bus sharing and power-gating in multi-master isolated systems.

What is the maximum operating temperature range for SI8640BD-AS?

SI8640BD-AS is rated for –40 to 125 °C ambient operating temperature and is AEC-Q100 Grade 0 qualified. This allows deployment in under-hood automotive environments, high-temperature industrial motor drives, and outdoor renewable energy inverters without thermal derating.

Can SI8640BD-AS operate with different supply voltages on each side?

Yes. SI8640BD-AS supports independent 2.5–5.5 V supplies on VDD1 and VDD2, enabling level translation between 3.3 V microcontrollers and 5 V peripheral interfaces. Both sides feature separate UVLO thresholds (2.24 V typ), ensuring robust start-up and shutdown sequencing across mismatched rail conditions.

SI8640BD-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:: 4/0

Channel Type:: Unidirectional

Voltage - Isolation:: 5000Vrms

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

SI8640BD-AS FAQ

1.How can I place an order for SI8640BD-AS through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8640BD-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 SI8640BD-AS reliable?

The price and inventory of SI8640BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640BD-AS is usually 5 days.

3.What payment methods are accepted for SI8640BD-AS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640BD-AS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8640BD-AS?

SI8640BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8640BD-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 SI8640BD-AS?

For technical support, including SI8640BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640BD-AS requirements.

6.How does Aetrix verify that SI8640BD-AS is sourced from the original manufacturer or authorized distributors?

All SI8640BD-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 SI8640BD-AS meets industry standards.

7.What is the process for return or replacement of SI8640BD-AS?

All SI8640BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8640BD-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 SI8640BD-AS part is unused and in its original packaging.

Return procedure for SI8640BD-AS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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