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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI86S640BC-IS1R

Name: SI86S640BC-IS1R
Brand: Skyworks Solutions Inc.
SKU: SI86S640BC-IS1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI86S640BC-IS1R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SI86S640BC-IS1R.pdf

Description:: 3.75 KVRMS ISOLATOR, 4 UNIDIRECT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI86S640BC-IS1R from Skyworks Solutions is a 4-channel, reinforced-isolation digital isolator with bidirectional signal transfer across an RF-based semiconductor barrier. It delivers DC–150 Mbps data rate, 10 ns typical propagation delay, and 6000 VRMS isolation rating in a WB SOIC-16 package. It operates from 2.25–5.5 V supplies and supports fail-safe default-high output mode, making it suitable for isolated motor control gate drivers and battery management system communication interfaces.

For engineers reviewing the SI86S640BC-IS1R datasheet, SI86S640BC-IS1R pinout, SI86S640BC-IS1R application, or SI86S640BC-IS1R equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade AEC-Q100 qualification, IEC 60747-17 reinforced insulation compliance, and real-world use cases in onboard chargers and traction inverters.

Technical Context

The SI86S640BC-IS1R implements RF-based on/off keying modulation across a monolithic semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity (100 kV/µs CMTI). Its architecture supports independent side-A and side-B undervoltage lockout (UVLO) with 2.10–2.25 V thresholds and integrated reset detection at ~1.7 V.

All four channels are bidirectional I/O with Schmitt-trigger + CMOS input thresholds, tri-state outputs controlled by EN1/EN2, and selectable fail-safe output state (default high per "BC" suffix). It includes no internal sleep mode (SMb not present), distinguishing it from Si86SMx variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	DC to 150 Mbps - supports high-speed SPI, isolated ADC/DAC interfaces, and real-time motor control feedback loops.
Propagation Delay	10 ns typical - enables tight timing budgets in closed-loop power converter control and fast-response safety systems.
Isolation Rating	6000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577 and IEC 60747-17 for industrial & automotive high-voltage domains.
Supply Voltage	2.25–5.5 V per side - allows interoperability with 3.3 V and 5 V logic families without level-shifting circuitry.
Operating Temperature	–40 °C to +125 °C - qualified for under-hood automotive applications including onboard chargers and battery management systems.
Fail-Safe Mode	Default high output - ensures safe logic-high state during side-A power loss, critical for enable/disable signaling in isolated gate drivers.
CMTI	≥100 kV/µs - prevents false triggering in noisy high-dV/dt environments such as power inverters and motor drives.

Pinout & Package

SI86S640BC-IS1R is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.3 mm creepage/clearance, supporting 6000 VRMS working voltage. Pinout conforms to Figure 2 ("Si86S64x/L4x Pinouts") in the datasheet.

Pin/Terminal	Circuit Role	Design Meaning
VDD1, GND1	Side A supply and ground	Power domain for inputs A1–A4 and enable EN1; must be bypassed with 0.1 µF + 10 µF capacitors.
A1–A4	Side A digital I/O	Bidirectional isolated channels; support Schmitt-trigger + CMOS thresholds for noise immunity in industrial bus lines.
EN1	Side A output enable	Active-high control: drives all A-side outputs into high-impedance when low-enables shared-bus arbitration.
VDD2, GND2	Side B supply and ground	Independent power domain for outputs B1–B4 and EN2; supports galvanic separation between control and power stages.
B1–B4	Side B digital I/O	Mirror of A1–A4; electrically isolated but functionally paired-used for feedback, status, or command transmission across barrier.
EN2	Side B output enable	Active-high control: places B-side outputs in high-Z state-essential for multi-master isolated SPI or CAN bus arbitration.

Key Features

Feature	Design Value
No start-up initialization	RF modulation architecture eliminates boot sequence-output follows input immediately after UVLO exit, reducing system latency.
Reinforced IEC 60747-17 rating	Validated barrier integrity for functional safety-critical applications including ISO 26262 ASIL-B compliant BMS and traction inverters.
Tri-state outputs with EN1/EN2	Per-side enable pins allow dynamic bus sharing without external MOSFET switches-reducing BOM count in multi-peripheral isolation designs.
Selectable fail-safe mode (BC = default high)	Guarantees known logic state during side-A power interruption-prevents unintended gate turn-on in isolated IGBT/MOSFET drivers.
High electromagnetic immunity	100 kV/µs common-mode transient immunity ensures reliable operation near switching nodes in 100+ kW inverters and SMPS.

Applications

Industrial Motor Control	Automotive Onboard Charger
Use Scenario: Isolating PWM gate drive signals and current-sense feedback between MCU and 3-phase inverter stage. IC Role / Device Role / Timing Role: Bidirectional signal isolator providing timing-critical gate enable/disable and fault reporting across 600 V DC bus. Use Value: 10 ns propagation delay ensures <1% duty-cycle error at 100 kHz switching; 6000 VRMS rating withstands repetitive surge transients in industrial VFDs.	Use Scenario: Isolating communication between AC/DC controller and DC/DC secondary side in bidirectional OBC topologies. IC Role / Device Role / Timing Role: Four-channel isolator handling isolated UART, fault signaling, and analog monitoring across primary-secondary barrier. Use Value: AEC-Q100 Grade 1 qualification and –40 °C to +125 °C operation ensure reliability in under-hood thermal cycling and vibration environments.
Isolated ADC Interface	Battery Management System
Use Scenario: Digitally isolating serial interface (e.g., SPI) between precision ADC and host processor in high-voltage battery string monitoring. IC Role / Device Role / Timing Role: High-speed, low-jitter isolator preserving ADC sample timing integrity and preventing ground loop-induced measurement drift. Use Value: 150 Mbps capability supports oversampled sigma-delta ADCs; 3.5 ns pulse width distortion minimizes sampling window skew across multiple channels.	Use Scenario: Isolating cell voltage and temperature telemetry from high-side battery stack to low-side MCU in EV traction packs. IC Role / Device Role / Timing Role: Reinforced isolator transmitting BMS fault flags, SOC updates, and thermal alerts across 800 V isolation barrier. Use Value: IEC 60747-17 certification satisfies reinforced insulation requirements for ASIL-C diagnostic paths in ISO 26262-compliant BMS architectures.

Industrial Motor Control

Automotive Onboard Charger

Use Scenario: Isolating PWM gate drive signals and current-sense feedback between MCU and 3-phase inverter stage.

IC Role / Device Role / Timing Role: Bidirectional signal isolator providing timing-critical gate enable/disable and fault reporting across 600 V DC bus.

Use Value: 10 ns propagation delay ensures <1% duty-cycle error at 100 kHz switching; 6000 VRMS rating withstands repetitive surge transients in industrial VFDs.

Use Scenario: Isolating communication between AC/DC controller and DC/DC secondary side in bidirectional OBC topologies.

IC Role / Device Role / Timing Role: Four-channel isolator handling isolated UART, fault signaling, and analog monitoring across primary-secondary barrier.

Use Value: AEC-Q100 Grade 1 qualification and –40 °C to +125 °C operation ensure reliability in under-hood thermal cycling and vibration environments.

Isolated ADC Interface

Battery Management System

Use Scenario: Digitally isolating serial interface (e.g., SPI) between precision ADC and host processor in high-voltage battery string monitoring.

IC Role / Device Role / Timing Role: High-speed, low-jitter isolator preserving ADC sample timing integrity and preventing ground loop-induced measurement drift.

Use Value: 150 Mbps capability supports oversampled sigma-delta ADCs; 3.5 ns pulse width distortion minimizes sampling window skew across multiple channels.

Use Scenario: Isolating cell voltage and temperature telemetry from high-side battery stack to low-side MCU in EV traction packs.

IC Role / Device Role / Timing Role: Reinforced isolator transmitting BMS fault flags, SOC updates, and thermal alerts across 800 V isolation barrier.

Use Value: IEC 60747-17 certification satisfies reinforced insulation requirements for ASIL-C diagnostic paths in ISO 26262-compliant BMS architectures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SI86S641BC-IS1R	Same pinout and specs, but default-low fail-safe output ('BC' vs 'BD' suffix denotes high/low default).	Suitable where safety logic requires active-low enable or fault assertion during power loss.	Select SI86S641BC-IS1R only if system-level fault response mandates default-low behavior on side-B outputs during side-A brownout.
ADUM4402BRWZ	4-channel, 100 Mbps, 5000 VRMS, SOIC-16; uses iCoupler® capacitive isolation; higher quiescent current (3.5 mA/channel @ 5 V).	Lacks AEC-Q100 qualification and IEC 60747-17 reinforced rating-limited to industrial, not automotive safety-critical use.	Choose ADUM4402BRWZ only for cost-sensitive non-automotive designs where 5000 VRMS suffices and CMTI >75 kV/µs is acceptable.

Compared with SI86S641BC-IS1R, the SI86S640BC-IS1R provides guaranteed default-high outputs during side-A unpowering-critical for gate driver enable lines. Versus ADUM4402BRWZ, it offers higher isolation rating, automotive qualification, and lower power, but requires stricter layout for RF immunity.

Availability

SI86S640BC-IS1R is available at Aetrix Electronics and suitable for industrial motor control, automotive onboard chargers, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for SI86S640BC-IS1R 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 high-performance analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.

The Si86S6xx family is engineered for high-reliability isolation in harsh environments-targeting automotive electrification, industrial automation, and medical power systems where reinforced insulation and AEC-Q100 compliance are mandatory.

FAQ

What is the isolation rating and safety certification status of SI86S640BC-IS1R?

SI86S640BC-IS1R is rated for 6000 VRMS isolation per UL 1577 for 1 minute and carries reinforced insulation certification per IEC 60747-17. It also meets CSA 62368-1 and 60601-1, and CQC GB4943.1. These certifications are fully documented in Skyworks' official safety reports-no pending approvals apply to this specific part number.

Does SI86S640BC-IS1R support sleep mode or low-power operation?

No, SI86S640BC-IS1R does not include sleep mode functionality. The "SMb" pin is absent-this feature is exclusive to Si86SMx variants (e.g., Si86SM42). SI86S640BC-IS1R operates in standard mode only, with quiescent current of 0.84 mA (side A) and 2.83 mA (side B) at 5 V, per Table 10 in the datasheet.

What does the "BC" suffix indicate in SI86S640BC-IS1R?

The "BC" suffix specifies the fail-safe output configuration: default-high output state on side-B when side-A supply is unpowered (VDD1 < 2.25 V). This is distinct from "BD" (default-low) and "BE" (no fail-safe). The behavior is hardware-defined and cannot be changed via configuration pins or firmware.

Can SI86S640BC-IS1R be used in SPI isolation applications?

Yes, SI86S640BC-IS1R supports SPI isolation by assigning A1/A2/A3/A4 and B1/B2/B3/B4 to MOSI, MISO, SCLK, and CS signals-though it lacks dedicated SPI control logic like the Si86SSx family. For full SPI protocol transparency (including clock edge alignment and chip select synchronization), Si86SS41 or Si86SS51 are preferred alternatives.

What package type and creepage distance does SI86S640BC-IS1R use?

SI86S640BC-IS1R uses the WB SOIC-16 (wide-body SOIC-16) package with 8.3 mm minimum creepage and clearance, enabling 6000 VRMS working voltage. This exceeds IPC-2221B requirements for reinforced insulation at 800 V RMS systems and is validated per IEC 60664-1 for pollution degree 2 environments.

SI86S640BC-IS1R Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Capacitive Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 4

Inputs - Side 1/Side 2:: 4/0

Channel Type:: Unidirectional

Voltage - Isolation:: 3750Vrms

Common Mode Transient Immunity (Min):: 100kV/µs

Data Rate:: 150Mbps

Propagation Delay tpLH / tpHL (Max):: 14ns, 14ns

Pulse Width Distortion (Max):: 2ns

Rise / Fall Time (Typ):: 2.5ns, 2.5ns

Voltage - Supply:: 2.25V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SI86S640BC-IS1R FAQ

1.How can I place an order for SI86S640BC-IS1R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI86S640BC-IS1R 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 SI86S640BC-IS1R reliable?

The price and inventory of SI86S640BC-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S640BC-IS1R is usually 5 days.

3.What payment methods are accepted for SI86S640BC-IS1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S640BC-IS1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI86S640BC-IS1R?

SI86S640BC-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI86S640BC-IS1R 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 SI86S640BC-IS1R?

For technical support, including SI86S640BC-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S640BC-IS1R requirements.

6.How does Aetrix verify that SI86S640BC-IS1R is sourced from the original manufacturer or authorized distributors?

All SI86S640BC-IS1R 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 SI86S640BC-IS1R meets industry standards.

7.What is the process for return or replacement of SI86S640BC-IS1R?

All SI86S640BC-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI86S640BC-IS1R, 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 SI86S640BC-IS1R part is unused and in its original packaging.

Return procedure for SI86S640BC-IS1R:

1.Submit a request within 90 days.

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

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