My Inquiry
My Account
Skyworks Solutions Inc. SI86S621FE-IS4
- Part No.:
- SI86S621FE-IS4
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86S621FE-IS4.pdf
- Description:
- 6.0 KVRMS ISOLATOR, 2 UNIDIRECTI
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI86S621FE-IS4 from Skyworks Solutions is a dual-channel, high-speed digital isolator with reinforced 6000 VRMS isolation, 150 Mbps data rate, and AEC-Q100 qualification for automotive systems. It features Schmitt-trigger inputs, selectable fail-safe output (default low), and operates across 2.25–5.5 V supply rails. Used in battery management systems and traction inverters where galvanic separation of control and power domains is critical.
For engineers reviewing the SI86S621FE-IS4 datasheet, SI86S621FE-IS4 pinout, SI86S621FE-IS4 application, or SI86S621FE-IS4 equivalent, this page delivers verified timing specs (9 ns typical propagation delay), CMTI (100 kV/µs), fail-safe behavior during UVLO, and SSO-8 package layout constraints - all essential for isolated gate driver interfaces and functional safety-compliant designs.
Technical Context
The SI86S621FE-IS4 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating start-up initialization and enabling deterministic 300 µs power-on reset. Its dual-channel architecture supports independent side-A (VDD1/GND1) and side-B (VDD2/GND2) supplies with separate UVLO (2.10–2.25 V) and reset thresholds (~1.7 V).
It integrates input deglitch filters (36 ns), CMOS/Schmitt thresholds for noise immunity, and precise timing: 9 ns typical propagation delay, ≤4.5 ns pulse width distortion, and ≤3 ns channel-to-channel skew. Reinforced insulation per IEC 60747-17 and UL 1577 (6000 VRMS) enables use in 600 VRMS working voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 150 Mbps - supports high-speed SPI, CAN FD, and isolated ADC interface clocking without bottlenecks |
| Propagation delay | 9 ns typical - enables tight timing closure in motor control PWM feedback loops |
| CMTI | 100 kV/µs minimum - ensures robust operation in noisy inverter switching environments |
| Isolation rating | 6000 VRMS - meets reinforced insulation requirements for 600 VRMS working voltage systems per UL 1577 |
| Supply range | 2.25–5.5 V - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-safe mode | Default low output - guarantees safe state during power loss in BMS fault detection circuits |
| Operating temp | –40 to +125 °C - qualified for under-hood automotive applications per AEC-Q100 Grade 1 |
Pinout & Package
SI86S621FE-IS4 uses an SSO-8 (wide-body SOIC-8) package with 8.0 mm creepage/clearance, optimized for 6000 VRMS isolation. Pin 1 = VDD1, Pin 2 = A1, Pin 3 = A2, Pin 4 = GND1, Pin 5 = GND2, Pin 6 = B1, Pin 7 = B2, Pin 8 = VDD2. No NC pins; all terminals are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Side A power supply | Supplies isolated input-side logic; must be bypassed with 0.1 µF + 10 µF capacitors |
| A1, A2 | Side A digital inputs | Dual-channel data inputs with Schmitt-trigger + CMOS thresholds for noise rejection |
| GND1 | Side A ground reference | Return path for VDD1; must be physically separated from GND2 by ≥8.0 mm |
| GND2 | Side B ground reference | Return path for VDD2; forms isolation barrier boundary with GND1 |
| B1, B2 | Side B digital outputs | Fail-safe default-low outputs; 50 Ω nominal impedance for controlled-impedance PCB routing |
| VDD2 | Side B power supply | Supplies isolated output-side logic; independent of VDD1 for split-rail system design |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates optical degradation and start-up delays; enables immediate data transmission after power application |
| Selectable fail-safe output | Default-low configuration ensures BMS shutdown signal remains asserted during side-A power loss |
| 36 ns input deglitch filter | Rejects EMI-induced transients below 28 MHz, preventing false triggering in high-dV/dt motor drive environments |
| 100 kV/µs CMTI | Withstands fast common-mode transients from IGBT switching without data corruption |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood operation at 125 °C junction temperature |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADC signals and pack contactor control lines in EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator providing galvanic separation between low-voltage MCU domain and high-voltage battery stack. Use Value: 6000 VRMS isolation withstands pack voltages up to 1000 VDC; default-low fail-safe prevents unintended contactor closure during MCU brownout. | Use Scenario: Transmitting PWM gate signals from controller to isolated IGBT/SiC drivers in electric vehicle traction inverters. IC Role / Device Role / Timing Role: High-speed digital isolator delivering synchronized, low-skew gate drive enable/disable commands across isolation barrier. Use Value: 9 ns propagation delay and ≤3 ns channel skew ensure precise dead-time control; 100 kV/µs CMTI rejects inverter switching noise. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
Use Scenario: Isolating communication between AC/DC PFC controller and DC/DC LLC controller in bidirectional OBCs. IC Role / Device Role / Timing Role: Dual-channel isolator conveying status and control signals between two independently regulated power stages. Use Value: 2.25–5.5 V supply flexibility allows direct connection to both 3.3 V and 5 V controller domains; reinforced insulation meets IEC 62368-1. | Use Scenario: Providing isolated digital input conditioning for 24 V industrial fieldbus sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Digital isolator converting unidirectional 24 V sensor signals to clean 3.3 V logic levels for FPGA/MCU processing. Use Value: Schmitt-trigger inputs tolerate slow-rising industrial signals; 8.0 mm creepage meets IEC 60664-1 Category II mains requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM121N1BRZ-RL7 | 5000 VRMS isolation, 150 Mbps, default-high fail-safe, SOIC-8 (narrow body) | Lacks AEC-Q100 qualification; lower creepage (3.9 mm) limits use in >400 VRMS systems | Choose for cost-sensitive industrial designs where 5000 VRMS suffices and default-high logic is acceptable |
| ISO7721FDWR | 5000 VRMS, 100 Mbps, 11 ns propagation delay, SOIC-8 (narrow body), no deglitch filter | Lower CMTI (85 kV/µs); not AEC-Q100 qualified; lacks input filtering for noisy factory floors | Prefer for non-automotive, lower-speed isolated UART or I²C where board space is constrained |
Compared with ADUM121N1BRZ-RL7 and ISO7721FDWR, the SI86S621FE-IS4 provides higher isolation (6000 VRMS), automotive qualification, integrated 36 ns deglitching, and superior CMTI - making it the only option suitable for ASIL-B–compliant BMS and traction inverter subsystems requiring reinforced insulation and fail-safe defaults.
Availability
SI86S621FE-IS4 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and onboard chargers requiring stable component supply across automotive production lifecycles.
Supply support for SI86S621FE-IS4 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 wireless, automotive, and industrial markets.
The Si86S6xx family targets high-reliability automotive and industrial isolation, designed specifically for functional safety-critical applications including ASIL-B BMS and ISO 26262-compliant powertrain systems.
FAQ
What is the isolation voltage rating of the SI86S621FE-IS4 and which standards does it meet?
The SI86S621FE-IS4 is rated for 6000 VRMS isolation per UL 1577 (1 minute), with reinforced insulation certified to IEC 60747-17 (2121 Vpeak), CSA 62368-1 (600 VRMS working voltage), and VDE 60747-17. Its SSO-8 package provides 8.0 mm creepage and clearance, enabling compliance with IEC 60664-1 for up to 600 VRMS mains-connected systems. This makes SI86S621FE-IS4 suitable for high-voltage automotive and industrial isolation barriers.
Does the SI86S621FE-IS4 require external start-up initialization or configuration?
No, the SI86S621FE-IS4 requires no start-up initialization or configuration. Its RF-based isolation architecture enables immediate data transmission after power application. The device enters normal operation within 300 µs of VDD reaching UVLO threshold (2.10–2.25 V), with outputs transitioning to their fail-safe default-low state. This zero-initialization behavior simplifies system design and eliminates boot-time uncertainty in SI86S621FE-IS4-based BMS and inverter control systems.
What is the purpose and timing of the 36 ns input deglitch filter in the SI86S621FE-IS4?
The SI86S621FE-IS4 includes a factory-configured 36 ns input deglitch filter that removes noise pulses shorter than 36 ns - effectively rejecting EMI transients up to ~28 MHz. This prevents false triggering in high-dV/dt environments like traction inverters. Input pulses longer than 36 ns pass through with a fixed 36 ns delay, ensuring deterministic timing. The filter is permanently enabled in SI86S621FE-IS4 and cannot be disabled, enhancing reliability in automotive applications.
How does the fail-safe default-low output behavior function during power loss in the SI86S621FE-IS4?
In the SI86S621FE-IS4, when VDD1 drops below UVLO– (1.98–2.12 V) while VDD2 remains powered, outputs B1 and B2 transition to and hold a logic low state - guaranteed by internal pull-down circuitry. This default-low behavior persists until VDD1 recovers above UVLO+, ensuring fail-safe shutdown of downstream actuators (e.g., contactors) during MCU power faults. The SI86S621FE-IS4's specification explicitly defines this ordering option, distinguishing it from default-high variants.
What are the supply bypass requirements for stable operation of the SI86S621FE-IS4?
The SI86S621FE-IS4 requires 0.1 µF ceramic + 10 µF bulk capacitors placed between VDD1–GND1 and VDD2–GND2, located as close as possible to the respective pins. These bypass networks suppress high-frequency noise and stabilize supply rails during fast switching. For noisy environments, Skyworks recommends adding 50–300 Ω series resistors on A1/A2/B1/B2 lines. Failure to implement proper bypassing may cause erratic behavior or increased jitter in SI86S621FE-IS4 timing performance.
SI86S621FE-IS4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si86S62x
- Package/Case:
- 8-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 6000Vrms
- Common Mode Transient Immunity (Min):
- 150kV/µs
- Data Rate:
- 10Mbps
- Propagation Delay tpLH / tpHL (Max):
- 41.5ns, 41.5ns
- Pulse Width Distortion (Max):
- 2.5ns
- 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:
- 8-SSO
SI86S621FE-IS4 FAQ
1.How can I place an order for SI86S621FE-IS4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86S621FE-IS4 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 SI86S621FE-IS4 reliable?
The price and inventory of SI86S621FE-IS4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S621FE-IS4 is usually 5 days.
3.What payment methods are accepted for SI86S621FE-IS4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S621FE-IS4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86S621FE-IS4?
SI86S621FE-IS4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86S621FE-IS4 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 SI86S621FE-IS4?
For technical support, including SI86S621FE-IS4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S621FE-IS4 requirements.
6.How does Aetrix verify that SI86S621FE-IS4 is sourced from the original manufacturer or authorized distributors?
All SI86S621FE-IS4 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 SI86S621FE-IS4 meets industry standards.
7.What is the process for return or replacement of SI86S621FE-IS4?
All SI86S621FE-IS4 units undergo pre-shipment inspection (PSI). If there is an issue with SI86S621FE-IS4, 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 SI86S621FE-IS4 part is unused and in its original packaging.
Return procedure for SI86S621FE-IS4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86S621FE-IS4 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…
