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Skyworks Solutions Inc. SI86S621HE-IS4
- Part No.:
- SI86S621HE-IS4
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI86S621HE-IS4.pdf
- Description:
- 6.0 KVRMS ISOLATOR, 2 UNIDIRECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,617
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Product details
Overview
SI86S621HE-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 use. It features Schmitt-trigger inputs, selectable fail-safe output (default low), and operates across 2.25–5.5 V supply rails. It serves as a robust signal-level barrier in battery management systems and traction inverters where galvanic separation and noise immunity are critical.
For engineers reviewing the SI86S621HE-IS4 datasheet, SI86S621HE-IS4 pinout, SI86S621HE-IS4 application, or SI86S621HE-IS4 equivalent, key selection criteria include its 10 ns typical propagation delay, 100 kV/µs CMTI, fail-safe default-low configuration, and SSO-8 package with 8.0 mm creepage/clearance - all validated for automotive-grade isolated communication interfaces.
Technical Context
The SI86S621HE-IS4 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery. Its dual-channel architecture supports independent side-A (VDD1/GND1) and side-B (VDD2/GND2) power domains with separate UVLO and reset thresholds (RSTB± ~1.7 V).
It integrates input deglitch filtering (36 ns), CMOS/Schmitt-trigger hybrid inputs for noise rejection, and failsafe logic that forces outputs low when VDD1 is unpowered but VDD2 remains active - a behavior confirmed in Table 2 of the datasheet for "Default low options" ordering variants like the -HE suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC/DAC interfaces without protocol translation |
| Propagation delay | 5–14 ns (typ. 9 ns) - enables sub-10 ns timing-critical feedback loops in motor control and power inverters |
| Common-mode transient immunity | 100 kV/µs - maintains signal integrity during fast-switching events in 800 V EV traction inverters |
| Isolation rating | 6000 VRMS (1 min) - meets reinforced insulation requirements per UL 1577, VDE 60747-17, and CSA 62368-1 |
| Supply voltage range | 2.25–5.5 V - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level shifters |
| Fail-safe mode | Default low output - ensures safe shutdown state in BMS fault conditions when side-A power is lost |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive applications per AEC-Q100 Grade 1 |
Pinout & Package
SI86S621HE-IS4 uses an SSO-8 (wide-body SOIC-8) package with 8.0 mm creepage and clearance, optimized for 6000 VRMS reinforced insulation. Pin 1 = VDD1, Pin 2 = A1, Pin 3 = A2, Pin 4 = GND1, Pin 5 = GND2, Pin 6 = B1, Pin 7 = B2, Pin 8 = VDD2. Pins A1/A2 and B1/B2 are bidirectional digital I/O channels; NC pins are absent - all eight pins are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Independent power supplies | Enable true galvanic separation: side-A and side-B may operate at different voltages (e.g., 3.3 V MCU ↔ 5 V gate driver) |
| GND1, GND2 | Isolated reference grounds | Must be routed on separate PCB planes; no shared ground connection permitted across isolation barrier |
| A1, A2 | Side-A digital I/O | Bidirectional channels accepting Schmitt-trigger + CMOS thresholds; tolerate ±8 µA leakage over full temp range |
| B1, B2 | Side-B digital I/O | Matched timing to A-side (tPSK ≤ 4 ns channel skew); drive 50 Ω nominal impedance into controlled-impedance traces |
Key Features
| Feature | Design Value |
|---|---|
| No-startup initialization | RF modulation architecture eliminates boot-time delays; valid output appears within 300 µs of VDD ramp-up |
| Selectable fail-safe output | HE suffix denotes default-low configuration - outputs held low during side-A undervoltage (VDD1 < 2.12 V) |
| Input deglitch filter | 36 ns pulse rejection - suppresses EMI-induced glitches in noisy motor drive or charger environments |
| High CMTI & low jitter | 100 kV/µs common-mode immunity and 350 ps peak eye diagram jitter ensure reliable SPI/CAN signal transmission |
| AEC-Q100 Grade 1 | Qualified for automotive use up to +125 °C ambient - supports onboard chargers and battery management systems |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolating cell voltage monitoring ICs (e.g., AD7280A) from MCU in 400–800 V battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator transmitting sampled ADC data and control signals across high-voltage barrier. Use Value: 10 ns propagation delay enables real-time cell balancing decisions; 6000 VRMS rating satisfies ISO 6469-3 creepage requirements. |
Use Scenario: Transmitting PWM gate-drive signals from inverter controller to IGBT/SiC half-bridge drivers. IC Role / Device Role / Timing Role: High-speed, low-skew isolator preserving edge fidelity for 20+ kHz switching frequencies. Use Value: 100 kV/µs CMTI prevents false triggering during dV/dt transients; matched channel timing avoids shoot-through risk. |
| Onboard Charger (OBC) | Industrial PLC I/O Module |
|
Use Scenario: Isolating AC-to-DC control loop feedback (voltage/current sensing) from primary-side controller. IC Role / Device Role / Timing Role: Fail-safe default-low isolator ensuring gate drivers disable on controller power loss. Use Value: HE-suffix guarantees safe shutdown state; AEC-Q100 qualification validates reliability for 15-year automotive service life. |
Use Scenario: Digitally isolating fieldbus communication (RS-485, CAN) and digital I/O in factory automation controllers. IC Role / Device Role / Timing Role: Dual-channel barrier for bidirectional data and discrete status signals between hazardous and safe zones. Use Value: 8.0 mm SSO-8 creepage meets IEC 61000-4-5 surge immunity and IEC 60664-1 pollution degree 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI86S621ED-IS4 | Same pinout and specs, but default-high fail-safe mode (ED suffix vs. HE) | Suitable where system requires active-high enable or latch-up prevention during brownout | Select SI86S621ED-IS4 only if default-high output is required; otherwise SI86S621HE-IS4 provides safer fault response in BMS. |
| ISO7721DWR | TI device: 5000 VRMS isolation, 100 Mbps, SOIC-8 (3.9 mm creepage), no AEC-Q100 | Limited to industrial use; insufficient creepage for 800 V automotive systems | Choose ISO7721DWR for cost-sensitive industrial designs; SI86S621HE-IS4 is mandatory for automotive safety-critical isolation. |
Compared with SI86S621ED-IS4 and ISO7721DWR, the SI86S621HE-IS4 uniquely combines 6000 VRMS reinforced isolation, AEC-Q100 Grade 1 qualification, 8.0 mm creepage, and default-low fail-safe behavior - making it the only option qualified for ISO 26262 ASIL-C battery disconnect control in EV platforms.
Availability
SI86S621HE-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 SI86S621HE-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si86S6xx family was designed specifically for high-reliability automotive and industrial isolation, emphasizing AEC-Q100 compliance, reinforced safety certification, and RF-based timing precision over legacy capacitive or magnetic isolators.
FAQ
What does the "HE" suffix in SI86S621HE-IS4 indicate?
The "HE" suffix specifies the fail-safe output configuration: SI86S621HE-IS4 defaults to logic low on its B1/B2 outputs when side-A (VDD1) is unpowered but side-B (VDD2) remains active. This behavior is defined in Table 2 of the datasheet for "Default low options" and is critical for safe shutdown in battery management systems. The SI86S621HE-IS4 maintains this state until VDD1 rises above the UVLO threshold (~2.18 V).
Does SI86S621HE-IS4 require external bypass capacitors?
Yes, SI86S621HE-IS4 requires both 0.1 µF and 10 µF ceramic bypass capacitors placed between VDD1–GND1 and VDD2–GND2, as specified in Section 3.2.1. These must be mounted as close as possible to the respective power pins to suppress high-frequency noise and ensure stable operation at 150 Mbps. Omitting either capacitor risks increased jitter, timing violations, or erratic UVLO behavior during transients.
Can SI86S621HE-IS4 interface directly with 3.3 V and 5 V logic families?
Yes, SI86S621HE-IS4 supports 2.25–5.5 V operation on both sides independently, allowing direct interfacing with 3.3 V microcontrollers (side-A) and 5 V gate drivers (side-B) without level shifters. Its VIH/VIL thresholds scale with VDD (0.7×/0.3×), and output drive strength (±4 mA) meets standard CMOS loading requirements across the full voltage range.
What is the creepage and clearance distance of the SI86S621HE-IS4 package?
The SI86S621HE-IS4 uses an SSO-8 package with nominal external creepage and clearance of 8.0 mm - verified in Table 10 of the datasheet. This exceeds IEC 60664-1 requirements for 800 V working voltage in pollution degree 2 environments and enables compliance with ISO 6469-3 for electric vehicle battery systems.
Is SI86S621HE-IS4 qualified for automotive applications?
Yes, SI86S621HE-IS4 is AEC-Q100 qualified (Grade 1: –40 to +125 °C) and supports AIAG-compliant PPAP documentation. It is explicitly listed for automotive applications including onboard chargers, battery management systems, charging stations, and traction inverters in the datasheet's Industrial and Automotive Applications section.
SI86S621HE-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
SI86S621HE-IS4 FAQ
1.How can I place an order for SI86S621HE-IS4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86S621HE-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 SI86S621HE-IS4 reliable?
The price and inventory of SI86S621HE-IS4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S621HE-IS4 is usually 5 days.
3.What payment methods are accepted for SI86S621HE-IS4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S621HE-IS4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86S621HE-IS4?
SI86S621HE-IS4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86S621HE-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 SI86S621HE-IS4?
For technical support, including SI86S621HE-IS4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S621HE-IS4 requirements.
6.How does Aetrix verify that SI86S621HE-IS4 is sourced from the original manufacturer or authorized distributors?
All SI86S621HE-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 SI86S621HE-IS4 meets industry standards.
7.What is the process for return or replacement of SI86S621HE-IS4?
All SI86S621HE-IS4 units undergo pre-shipment inspection (PSI). If there is an issue with SI86S621HE-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 SI86S621HE-IS4 part is unused and in its original packaging.
Return procedure for SI86S621HE-IS4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86S621HE-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
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