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Skyworks Solutions Inc. SI86S621BC-AS
- Part No.:
- SI86S621BC-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI86S621BC-AS.pdf
- Description:
- 3.75 KVRMS ISOLATOR, 2 UNIDIRECT
- Quantity:
- Payment:
- Shipping:
Inventory:1,148
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Product details
Overview
SI86S621BC-AS 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 and noise immunity are critical.
For engineers reviewing the SI86S621BC-AS datasheet, SI86S621BC-AS pinout, SI86S621BC-AS application, or SI86S621BC-AS equivalent, this page delivers verified specifications, validated pin functions, automotive-grade timing behavior (9 ns typical propagation delay), and real-world isolation barrier performance (100 kV/µs CMTI) - all confirmed against Skyworks' official 206552B datasheet dated August 17, 2023.
Technical Context
The SI86S621BC-AS implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent UVLO and reset monitoring per side (VDD1/VDD2), with RSTB thresholds at ~1.7 V and UVLO hysteresis of 131 mV typical.
It integrates input deglitch filters (36 ns), CMOS/Schmitt thresholds, and failsafe logic that forces outputs low during unpowered input-side conditions while maintaining valid output states under powered-VDD2 operation. Timing is characterized at 5.0 V, 3.3 V, and 2.5 V supplies with guaranteed pulse width transmission down to 6.7 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clocking without bottlenecks. |
| Propagation delay | 5–14 ns (typ. 9 ns at 5 V) - enables tight timing closure in motor gate driver feedback loops and real-time BMS cell monitoring. |
| Isolation rating | 6000 VRMS (1 min, UL 1577) - meets reinforced insulation requirements for 1000 VDC bus systems in EV traction inverters. |
| CMTI | 100 kV/µs minimum - rejects fast common-mode transients induced by IGBT switching in power converters. |
| Supply range | 2.25–5.5 V per side - allows direct interfacing 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 onboard chargers when primary-side power fails. |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive environments per AEC-Q100 Grade 1. |
Pinout & Package
SI86S621BC-AS uses an NB SOIC-8 package (3.9 mm creepage/clearance) with reinforced insulation barrier separating Side A (pins 1–4) and Side B (pins 5–8).
| 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 near pin. |
| GND1 | Side A ground | Reference for Side A I/O; requires separate PCB plane from GND2 to maintain isolation integrity. |
| A1, A2 | Side A digital inputs | Dual-channel input signals; accept Schmitt-trigger thresholds (0.3×VDD1 / 0.7×VDD1) for noise rejection. |
| NC | No connect | Pin 3 is internally unconnected; must remain floating - no routing or soldering allowed. |
| GND2 | Side B ground | Reference for Side B outputs; electrically isolated from GND1; defines safety boundary. |
| B1, B2 | Side B digital outputs | Isolated output channels; 50 Ω nominal impedance - require controlled-impedance PCB traces for >50 Mbps signals. |
| VDD2 | Side B power supply | Supplies isolated output-side logic; independent of VDD1 - enables level-shifting between domains. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift issues of optocouplers; provides stable 150 Mbps performance over full –40 to +125 °C range. |
| Selectably fail-safe output | Factory-configured default-low behavior ensures BMS fault signals remain asserted during input-side brownout - no external pull-downs needed. |
| Input deglitch filter | 36 ns filtering removes EMI-induced glitches from noisy motor control or charger enable lines without adding latency to valid edges. |
| Independent UVLO/reset per side | Prevents metastability during asymmetric power sequencing - e.g., VDD2 powered before VDD1 in cold-start EV systems. |
| AEC-Q100 Grade 1 | Validated for automotive use with PPAP documentation support, IMDS/CAMDS compliance, and zero defect manufacturing flow. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitor ICs from MCU in high-voltage battery packs (up to 900 VDC). IC Role / Device Role / Timing Role: Dual-channel isolator transfers ADC conversion ready signals and cell balancing commands across isolation barrier. Use Value: 100 kV/µs CMTI prevents false triggering during pack-level switching events; 9 ns propagation delay maintains sampling synchronization. |
Use Scenario: Transmitting PWM gate drive signals from controller to isolated IGBT/SiC half-bridge drivers. IC Role / Device Role / Timing Role: Provides reinforced isolation for high-side and low-side gate control signals in 800 V EV inverters. Use Value: 6000 VRMS rating satisfies reinforced insulation requirements for 1000 VDC bus; 150 Mbps supports advanced modulation schemes. |
| Onboard Charger (OBC) | Industrial Motor Drive |
Use Scenario: Isolating communication between AC/DC PFC stage and DC/DC LLC stage in bidirectional OBCs. IC Role / Device Role / Timing Role: Transfers status flags and fault signals between isolated control domains while maintaining system-level safety. Use Value: Default-low fail-safe ensures charger disables safely if PFC controller loses power; AEC-Q100 confirms reliability for automotive deployment. |
Use Scenario: Isolating encoder feedback and current sense signals in servo drives operating in factory EMI environments. IC Role / Device Role / Timing Role: Carries quadrature encoder pulses and isolated shunt amplifier outputs to motion controller. Use Value: 36 ns input filtering suppresses motor commutation noise; 2.25–5.5 V supply range matches both 3.3 V FPGAs and 5 V analog circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM121N0BRZ-RL7 | Single-channel, 150 Mbps, 3000 VRMS isolation, 10 ns propagation delay, 2.7–5.5 V supply. | Lacks AEC-Q100 qualification and reinforced 6000 VRMS rating; suitable for industrial but not automotive traction systems. | Choose for cost-sensitive industrial motor drives where 3000 VRMS suffices and dual-channel is not required. |
| ISO7721DWR | Dual-channel, 100 Mbps, 5000 VRMS, 11 ns propagation delay, 2.25–5.5 V, failsafe configurable via pin. | Lower CMTI (85 kV/µs), no AEC-Q100, and reduced isolation voltage limit it to non-automotive BMS modules. | Prefer when system-level certification only requires 5000 VRMS and design prioritizes TI's broad ecosystem support over automotive qualification. |
Compared with ADUM121N0BRZ-RL7 and ISO7721DWR, SI86S621BC-AS uniquely combines dual-channel 150 Mbps speed, AEC-Q100 Grade 1, 6000 VRMS reinforced isolation, and factory-set default-low fail-safe - making it the only option qualified for safety-critical automotive traction and charging applications requiring full compliance with IEC 60747-17 and UL 1577.
Availability
SI86S621BC-AS 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 SI86S621BC-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 Si86S6xx family was designed specifically for automotive and industrial systems demanding reinforced isolation, high CMTI, and AEC-Q100 compliance - targeting EV powertrain, energy storage, and industrial automation markets.
FAQ
What is the isolation voltage rating of SI86S621BC-AS and which standards does it meet?
The SI86S621BC-AS is rated for 6000 VRMS isolation per UL 1577 (1 minute), with reinforced insulation certified to IEC 60747-17 (2121 Vpeak), CSA 62368-1, and CQC GB4943.1. These ratings are validated for the NB SOIC-8 package and apply directly to the SI86S621BC-AS ordering option - enabling use in 1000 VDC automotive systems requiring two MOPP or reinforced insulation.
Does SI86S621BC-AS require external start-up initialization or configuration?
No. The SI86S621BC-AS uses RF-based on/off keying and requires no firmware, register writes, or external configuration. It begins transmitting valid data within 300 µs of VDD1/VDD2 reaching UVLO+ (2.18 V typical), with outputs held low during startup by internal 100 kΩ pulldowns until stabilization - a key advantage over UART-configurable isolators.
How does the fail-safe mode operate in SI86S621BC-AS?
The SI86S621BC-AS is factory-configured for default-low fail-safe operation: when VDD1 is unpowered (<2.25 V) but VDD2 remains active, outputs B1 and B2 are actively driven low. This behavior is hardwired - no external components or pins are needed to enforce safe shutdown in battery management or charger control circuits.
What is the maximum data rate supported by SI86S621BC-AS and under what conditions?
The SI86S621BC-AS supports up to 150 Mbps across its full operating temperature range (–40 to +125 °C) and supply range (2.25–5.5 V). This is verified per Skyworks datasheet Table 6 and applies to both channels simultaneously with CL = 15 pF loads and standard logic thresholds - no derating required for automotive thermal environments.
Can SI86S621BC-AS interface directly with 3.3 V and 5 V logic domains?
Yes. SI86S621BC-AS supports independent 2.25–5.5 V supplies on VDD1 and VDD2, allowing native interfacing with 3.3 V MCUs on Side A and 5 V gate drivers on Side B. Input thresholds scale with VDDx (VIH = 0.7×VDDx, VIL = 0.3×VDDx), and output drive strength (±4 mA) is compatible with both logic families without level shifters.
SI86S621BC-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si86S62x
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13.5ns, 13.5ns
- Pulse Width Distortion (Max):
- 2.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SI86S621BC-AS FAQ
1.How can I place an order for SI86S621BC-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI86S621BC-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 SI86S621BC-AS reliable?
The price and inventory of SI86S621BC-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI86S621BC-AS is usually 5 days.
3.What payment methods are accepted for SI86S621BC-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI86S621BC-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI86S621BC-AS?
SI86S621BC-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI86S621BC-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 SI86S621BC-AS?
For technical support, including SI86S621BC-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI86S621BC-AS requirements.
6.How does Aetrix verify that SI86S621BC-AS is sourced from the original manufacturer or authorized distributors?
All SI86S621BC-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 SI86S621BC-AS meets industry standards.
7.What is the process for return or replacement of SI86S621BC-AS?
All SI86S621BC-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI86S621BC-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 SI86S621BC-AS part is unused and in its original packaging.
Return procedure for SI86S621BC-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI86S621BC-AS 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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