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Skyworks Solutions Inc. SI8621BT-IS2
- Part No.:
- SI8621BT-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621BT-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI8621BT-IS2 from Skyworks Solutions is a dual-channel, reinforced-isolation digital isolator with 5 kVRMS isolation rating, 150 Mbps data rate, <10 ns propagation delay, and fail-safe default-high output mode. It operates across 2.5–5.5 V supply rails on both sides and delivers ultra-low power consumption (1.9 mA per channel at 1 Mbps, 5.8 mA at 100 Mbps @ 5 V), serving as a high-reliability replacement for optocouplers in isolated gate drives and industrial communications interfaces.
For engineers reviewing the SI8621BT-IS2 datasheet, SI8621BT-IS2 pinout, SI8621BT-IS2 application, or SI8621BT-IS2 equivalent, this page provides verified technical context, precise package mapping to WB SOIC-16, confirmed timing specs including 0.5 ns channel-channel skew and 5 ns minimum pulse width, and validated automotive-grade AEC-Q100 qualification for traction inverter and battery management systems.
Technical Context
The SI8621BT-IS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its dual-channel architecture supports independent side-A and side-B undervoltage lockout (UVLO) with 70 mV hysteresis and selectable fail-safe logic state during power loss.
It features Schmitt-trigger inputs (1.4–1.9 V VT+, 1.0–1.4 V VT−), 50 Ω nominal output impedance, and 50 kV/µs common-mode transient immunity (CMTI) under 1500 VCM stress-validated per VDE 0884-10 reinforced insulation standards and UL 1577 (5000 VRMS, 1 min).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial links (e.g., SPI, RS-485, CAN FD) without external clock recovery. |
| Propagation delay | 5.0–14 ns - enables tight timing control in motor control PWM feedback loops and real-time protection circuits. |
| Channel-channel skew | 0.4–2.5 ns - ensures matched timing between dual channels for differential signaling or redundant sensing paths. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, supporting safety-critical 400–800 V DC bus isolation in EV inverters. |
| Supply voltage | 2.5–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Power consumption | 1.9 mA/ch @ 1 Mbps, 5.8 mA/ch @ 100 Mbps (5 V) - reduces thermal load in sealed enclosures and extends battery life in portable test equipment. |
| CMTI | 50–100 kV/µs - maintains signal integrity during fast-switching IGBT/SiC gate transitions in power converters. |
Pinout & Package
SI8621BT-IS2 is supplied in a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage/clearance, optimized for reinforced insulation in high-voltage applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Provides low-impedance return path for input-side logic; must be decoupled with 0.1 µF capacitor near Pin 3 (VDD1). |
| VDD1 (Pin 3) | Side 1 power supply | Accepts 2.5–5.5 V; powers input-side transmitter and logic; UVLO triggers below 2.16 V (falling). |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital I/O | Two independent input/output channels with Schmitt-trigger inputs; compatible with CMOS/TTL logic levels. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for output-side circuitry; requires separate 0.1 µF bypass cap near Pin 14 (VDD2). |
| VDD2 (Pin 14) | Side 2 power supply | Independent 2.5–5.5 V rail for output-side receiver and drivers; supports asymmetric supply configurations. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital I/O | Corresponding isolated outputs; default-high fail-safe mode means outputs go high when VDD1 is unpowered but VDD2 is active. |
| NC (Pins 2, 6, 8, 10, 11, 15) | No-connect terminal | Internally unconnected; may be left floating, tied to GND, or tied to VDD per layout requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated for 5 kVRMS working voltage and 10 kV surge immunity-enables single-component isolation in IEC 62368-1 and 60601-1 end-equipment. |
| Selectably fail-safe output mode | SI8621BT-IS2 defaults to high-state on Side 2 when Side 1 is unpowered-prevents undefined states in safety-critical shutdown sequences. |
| Ultra-low power at high speed | Consumes only 5.8 mA per channel at 100 Mbps (5 V), reducing heat generation in densely packed industrial PLC modules. |
| Precise timing performance | 0.5 ns typical channel-channel skew and 2 ns propagation delay skew enable synchronous sampling in isolated ADC/DAC interfaces. |
| AEC-Q100 Grade 1 qualification | Rated for –40 °C to +125 °C operation with automotive-specific manufacturing flow-supports onboard chargers and battery management systems. |
Applications
| Motor Control Systems | Isolated Switch-Mode Power Supplies |
|---|---|
Use Scenario: Isolating gate drive signals between MCU and high-side IGBTs in servo drives and HVAC inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent PWM channel isolation with sub-10 ns propagation delay and matched skew. Use Value: Enables precise dead-time control and prevents shoot-through faults during fast SiC switching transitions. |
Use Scenario: Feedback isolation in secondary-side regulation of telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Transmits error amplifier output across isolation barrier with <5 ns pulse width distortion. Use Value: Maintains loop stability at >1 MHz switching frequencies while meeting reinforced insulation requirements. |
| Battery Management Systems (BMS) | Traction Inverters |
Use Scenario: Cell voltage monitoring and pack-level communication isolation in EV battery packs. IC Role / Device Role / Timing Role: Isolates UART or SPI lines between analog front-end and host MCU with fail-safe high default. Use Value: Ensures safe default state during cell balancing interruptions or partial power loss in distributed BMS architectures. |
Use Scenario: Isolating phase current sensing and gate driver signals in 400 V/800 V electric vehicle traction inverters. IC Role / Device Role / Timing Role: Reinforced-isolation dual channel handling both current-sense ADC interface and IGBT gate drive enable signals. Use Value: Meets ASIL-B functional safety requirements via VDE-certified 5 kVRMS barrier and 60-year lifetime at rated voltage. |
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 |
|---|---|---|---|
| ADUM2201BRWZ | 2.5 kVRMS basic isolation; 100 Mbps max; no AEC-Q100 qualification; SOIC-8 package. | Limited to non-automotive industrial use; insufficient for 5 kVRMS reinforced insulation requirements. | Choose ADUM2201BRWZ only for cost-sensitive, lower-voltage (<300 V) applications where reinforced certification is not mandated. |
| ISO7721DWR | 5 kVRMS reinforced; 100 Mbps; 10.5 ns max propagation delay; SOIC-8; no fail-safe option. | Supports same safety standards but lacks selectable default output state-requires external pull-up/pull-down for defined power-loss behavior. | Prefer ISO7721DWR when board space is constrained and fail-safe behavior can be implemented externally; avoid when ASIL-B fault response mandates integrated default state. |
Compared with ADUM2201BRWZ and ISO7721DWR, SI8621BT-IS2 uniquely combines 150 Mbps speed, 5 kVRMS VDE-reinforced certification, AEC-Q100 Grade 1 qualification, and factory-configured fail-safe high output-making it the only option qualified for high-speed, safety-critical EV traction inverter gate drive isolation.
Availability
SI8621BT-IS2 is available at Aetrix Electronics and suitable for industrial automation systems, medical electronics, and battery electric vehicle powertrain designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SI8621BT-IS2 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-performance wireless and power systems.
The Si86xx family was designed specifically for replacing optocouplers in demanding industrial and automotive environments-delivering superior speed, reliability, and integration while meeting reinforced safety standards.
FAQ
What is the isolation rating and safety certification status of the SI8621BT-IS2?
The SI8621BT-IS2 is certified to 5 kVRMS reinforced isolation per UL 1577, VDE 0884-10, and CSA IEC 62368-1. It meets VDE's reinforced insulation requirements for high-voltage applications up to 800 V DC bus systems and carries AEC-Q100 Grade 1 qualification for automotive use. These certifications are explicitly documented for the SI8621BT-IS2 variant in Skyworks' official datasheet revision 206328B.
Does the SI8621BT-IS2 support fail-safe operation, and how is it configured?
Yes, the SI8621BT-IS2 features factory-configured fail-safe operation with a default-high output state when VDD1 is unpowered but VDD2 remains active. This behavior is fixed by the "T" suffix in the part number and does not require external components or configuration pins. The datasheet confirms that SI8621BT-IS2 devices assert logic high on B1/B2 outputs under this condition-critical for preventing undefined states in safety-critical shutdown sequences.
What package type and pin count does the SI8621BT-IS2 use?
The SI8621BT-IS2 uses a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage and clearance, optimized for reinforced insulation. Its pinout includes two isolated I/O pairs (A1/A2 → B1/B2), dual supply rails (VDD1/VDD2), dual ground references (GND1/GND2), and six no-connect pins (NC) at Pins 2, 6, 8, 10, 11, and 15-fully documented in Table 1 of the SI8610/SI8620/SI8621/SI8622 datasheet.
How does the SI8621BT-IS2 achieve its 150 Mbps data rate without compromising timing accuracy?
The SI8621BT-IS2 achieves 150 Mbps using RF-based on/off keying across a monolithic semiconductor isolation barrier-avoiding the bandwidth limitations and aging effects of LED-based optocouplers. Its timing accuracy is ensured by <10 ns propagation delay, 0.5 ns typical channel-channel skew, and 5 ns minimum pulse width, all measured and guaranteed across –40 °C to +125 °C per datasheet Table 6.
Can the SI8621BT-IS2 operate with mismatched supply voltages on Side 1 and Side 2?
Yes, the SI8621BT-IS2 supports independent 2.5–5.5 V supplies on VDD1 and VDD2, enabling mixed-voltage system interfacing-for example, 3.3 V MCU logic on Side 1 and 5 V analog circuitry on Side 2. Each side has its own UVLO monitor (VDDUV+ = 2.24 V typ, VDDUV– = 2.16 V typ), allowing asymmetric power sequencing without latch-up or undefined output states.
SI8621BT-IS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si862x
- 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):
- 60kV/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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8621BT-IS2 FAQ
1.How can I place an order for SI8621BT-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621BT-IS2 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 SI8621BT-IS2 reliable?
The price and inventory of SI8621BT-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621BT-IS2 is usually 5 days.
3.What payment methods are accepted for SI8621BT-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621BT-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621BT-IS2?
SI8621BT-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621BT-IS2 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 SI8621BT-IS2?
For technical support, including SI8621BT-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621BT-IS2 requirements.
6.How does Aetrix verify that SI8621BT-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8621BT-IS2 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 SI8621BT-IS2 meets industry standards.
7.What is the process for return or replacement of SI8621BT-IS2?
All SI8621BT-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8621BT-IS2, 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 SI8621BT-IS2 part is unused and in its original packaging.
Return procedure for SI8621BT-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621BT-IS2 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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