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Skyworks Solutions Inc. SI8621BD-AS
- Part No.:
- SI8621BD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621BD-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 1 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
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Product details
Overview
SI8621BD-AS from Skyworks Solutions is a dual-channel, unidirectional digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and fail-safe default-low output mode. It operates across 2.5–5.5 V supplies and –40 to 125 °C, serving as a high-reliability replacement for optocouplers in isolated gate drivers and industrial PLC I/O modules.
For engineers reviewing the SI8621BD-AS datasheet, SI8621BD-AS pinout, SI8621BD-AS application, or SI8621BD-AS equivalent, this page delivers verified specifications, WB SOIC-16 package layout, automotive-grade AEC-Q100 qualification, VDE 0884-10 reinforced insulation compliance, and real-world timing performance metrics including 0.5 ns channel-channel skew and 5 ns minimum pulse width.
Technical Context
The SI8621BD-AS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity. Its dual-channel architecture supports independent side-A and side-B undervoltage lockout (UVLO) with 2.24 V typical rising threshold and 70 mV hysteresis.
It features Schmitt-trigger inputs (1.67 V typical VT+, 1.23 V typical VT–), 50 Ω nominal output impedance, and failsafe logic that holds outputs low when VDD1 is unpowered and VDD2 remains active-confirmed by Table 3 ordering-mode behavior for "D" suffix devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clocking without oversampling. |
| Propagation delay | 5.0–14 ns - ensures tight timing budgets in motor control PWM feedback loops and real-time power converter monitoring. |
| Channel-channel skew | 0.4–2.5 ns - enables precise synchronization between dual isolated signals, critical for phase-shifted gate drive or redundant sensor paths. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, allowing direct use in mains-connected industrial equipment and EV battery management systems. |
| Supply voltage | 2.5–5.5 V per side - permits interoperability with both 3.3 V microcontrollers and 5 V legacy peripherals without level-shifting. |
| CMTI | 50 kV/µs (Si8621BD-AS is B/C/D variant) - withstands fast transients in motor drives and inverters without signal corruption or latch-up. |
| Fail-safe mode | Default-low output - guarantees safe shutdown state during input-side power loss, required for functional safety in IEC 61508-compliant systems. |
Pinout & Package
SI8621BD-AS is supplied in a wide-body SOIC-16 (WB SOIC-16) package with creepage/clearance optimized for 5 kVRMS reinforced insulation. Pin 1 is GND1; pins 2, 5, 6, 8, 10, 11, 12, and 15 are NC (no connect); pin 3 is VDD1; pin 4 is A1 (side-1 input/output); pin 7 is GND1; pin 9 is GND2; pin 13 is B1 (side-2 input/output); pin 14 is VDD2; and pin 16 is GND2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side-1 ground reference | Provides return path for side-A circuitry; must be connected to local low-noise ground plane adjacent to VDD1. |
| VDD1 (Pin 3) | Side-1 supply input | Accepts 2.5–5.5 V; requires 0.1 µF bypass capacitor placed within 2 mm of pin per datasheet layout guidance. |
| A1 (Pin 4) | Side-1 digital I/O | Unidirectional input-only channel for SI8621BD-AS; accepts 0–VDD1 logic levels with Schmitt-trigger hysteresis. |
| GND2 (Pins 9, 16) | Side-2 ground reference | Isolated return for side-B; must be separated from GND1 by ≥8.3 mm creepage per VDE 0884-10 requirements. |
| B1 (Pin 13) | Side-2 digital I/O | Unidirectional output-only channel; drives 4 mA at VOL ≤ 0.4 V with 50 Ω output impedance for controlled-impedance trace routing. |
| VDD2 (Pin 14) | Side-2 supply input | Independent 2.5–5.5 V supply; enables galvanic separation between controller and power stage domains. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; provides stable propagation delay (<10 ns) over –40 to 125 °C. |
| Selectable fail-safe output | "D" suffix denotes default-low behavior-ensures gate driver disable or fault flag assertion during input-side brownout without external pull-downs. |
| Ultra-low power at 100 Mbps | 5.8 mA per side at 5 V / 100 Mbps (typical), reducing thermal load in densely packed industrial I/O modules. |
| VDE 0884-10 reinforced certification | Validated for 10 kV surge immunity and 60-year lifetime at rated working voltage-meets IEC 62368-1 and IEC 60601-1 system-level safety standards. |
| AEC-Q100 Grade 1 qualification | Qualified for automotive applications including onboard chargers and traction inverters, with full PPAP documentation support. |
Applications
| Industrial PLC I/O Modules | Isolated Gate Drivers |
|---|---|
Use Scenario: Digital input card receiving 24 V DC field signals in factory automation cabinets with high EMI. IC Role / Device Role / Timing Role: Isolates field-side 24 V logic from 3.3 V controller domain while transmitting status changes with <14 ns delay. Use Value: Enables direct connection to noisy industrial buses without external filtering; CMTI >50 kV/µs prevents false triggering during contactor switching. |
Use Scenario: Driving high-side IGBTs in three-phase motor inverters where gate signals must survive 1500 V common-mode transients. IC Role / Device Role / Timing Role: Transmits PWM enable/disable commands across isolation barrier with 0.5 ns channel skew to maintain phase alignment. Use Value: Reinforced 5 kVRMS rating and 10 kV surge capability eliminate need for external transient protection components. |
| Battery Management Systems (BMS) | Medical Isolated Data Acquisition |
Use Scenario: Monitoring cell voltages in 400 V EV battery packs using isolated ADC interfaces with microcontroller on low-voltage side. IC Role / Device Role / Timing Role: Provides bidirectional communication path (via paired isolators) with fail-safe low output ensuring safe discharge command during MCU reset. Use Value: AEC-Q100 qualification and 125 °C operation guarantee reliability in under-hood thermal environments. |
Use Scenario: Isolating ECG front-end analog-to-digital conversion from USB host processor in Class II medical devices. IC Role / Device Role / Timing Role: Transfers digitized patient data across reinforced barrier compliant with IEC 60601-1 4 kV rms test requirement. Use Value: VDE-certified reinforced insulation eliminates need for additional creepage barriers in PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM120N0BRZ-RL7 | Single-channel, 150 Mbps, 3.75 kVRMS basic isolation, no fail-safe mode selection. | Lacks default-low output behavior and VDE 0884-10 reinforced certification-requires external fail-safe circuitry for safety-critical use. | Choose when only basic isolation suffices and cost sensitivity outweighs safety certification needs. |
| ISO6721FDWR | Dual-channel, 50 Mbps, 5 kVRMS reinforced, default-high fail-safe, 16-pin SOIC package. | Lower data rate limits use in high-speed SPI or encoder interfaces; default-high output may conflict with safety logic requiring low-default assertion. | Prefer when lower bandwidth is acceptable and system design mandates default-high assertion on power loss. |
Compared with ADUM120N0BRZ-RL7 and ISO6721FDWR, SI8621BD-AS uniquely combines 150 Mbps speed, VDE-reinforced 5 kVRMS rating, and factory-configured default-low fail-safe behavior-enabling single-component compliance with IEC 61800-5-2 and ISO 26262 ASIL-B signal path requirements without external components.
Availability
SI8621BD-AS is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and isolated switch mode supplies requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI8621BD-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si86xx family was engineered specifically for high-reliability isolation in harsh environments-targeting industrial motor control, renewable energy inverters, and electric vehicle power systems where optocoupler limitations in speed, lifetime, and temperature stability are unacceptable.
FAQ
What is the isolation rating and safety certification status of the SI8621BD-AS?
The SI8621BD-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577 (5000 VRMS, 1 minute), VDE 0884-10 (reinforced), CSA IEC 62368-1, and CQC GB4943.1. These certifications validate its suitability for safety-critical applications such as industrial PLCs and EV battery management systems where reinforced insulation is mandated.
Does the SI8621BD-AS require external startup initialization or configuration?
No, the SI8621BD-AS requires no startup initialization or configuration. Its RF-based architecture begins transmitting valid data within 40 µs of VDD application (tSU max), with outputs following input states after UVLO exit-making it ideal for systems demanding immediate operational readiness after power-on.
What does the "D" suffix in SI8621BD-AS indicate regarding fail-safe behavior?
The "D" suffix specifies a factory-configured default-low fail-safe mode: when VDD1 is unpowered and VDD2 remains active, the B1 output is held low. This behavior is defined in Table 3 of the datasheet and eliminates the need for external pull-down resistors in safety-critical shutdown paths.
Can the SI8621BD-AS operate with different supply voltages on each side?
Yes, SI8621BD-AS supports independent 2.5–5.5 V supplies on VDD1 and VDD2. This allows interfacing a 3.3 V microcontroller (side-A) with a 5 V gate driver IC (side-B) without level shifters-maintaining signal integrity and timing accuracy across the isolation barrier.
Is the SI8621BD-AS qualified for automotive applications?
Yes, SI8621BD-AS is AEC-Q100 Grade 1 qualified (–40 to 125 °C) and supported with AIAG-compliant PPAP documentation, IMDS, and CAMDS listings-enabling its use in automotive onboard chargers, battery management systems, and traction inverter control modules.
SI8621BD-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- 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:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- 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:
- 2.5V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8621BD-AS FAQ
1.How can I place an order for SI8621BD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621BD-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 SI8621BD-AS reliable?
The price and inventory of SI8621BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621BD-AS is usually 5 days.
3.What payment methods are accepted for SI8621BD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621BD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621BD-AS?
SI8621BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621BD-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 SI8621BD-AS?
For technical support, including SI8621BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621BD-AS requirements.
6.How does Aetrix verify that SI8621BD-AS is sourced from the original manufacturer or authorized distributors?
All SI8621BD-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 SI8621BD-AS meets industry standards.
7.What is the process for return or replacement of SI8621BD-AS?
All SI8621BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621BD-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 SI8621BD-AS part is unused and in its original packaging.
Return procedure for SI8621BD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621BD-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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