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Skyworks Solutions Inc. SI8621BT-AS2
- Part No.:
- SI8621BT-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621BT-AS2.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:4,632
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Product details
Overview
SI8621BT-AS2 from Skyworks Solutions is a dual-channel, reinforced-isolation digital isolator in WB SOIC-16 package, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 5 kVRMS isolation. It features selectable fail-safe output (default high), operates from 2.5–5.5 V, and is qualified for automotive applications per AEC-Q100.
For engineers reviewing the SI8621BT-AS2 datasheet, SI8621BT-AS2 pinout, SI8621BT-AS2 application, or SI8621BT-AS2 equivalent, this page delivers verified specifications, validated pin functions, automotive-grade timing performance, and real-world isolation design considerations for battery management and traction inverter interfaces.
Technical Context
The SI8621BT-AS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering robust noise immunity. Its dual-channel architecture supports independent side-A and side-B power domains with separate undervoltage lockout (UVLO) monitors per supply rail.
It integrates Schmitt-trigger inputs for >400 mV hysteresis, 50 Ω nominal output impedance, and failsafe logic controlled by ordering option ('T' suffix denotes default-high output). Reinforced VDE 0884-10 certification enables use in safety-critical automotive systems up to 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports CAN FD, SPI, and isolated ADC/DAC interfaces without external clock conditioning. |
| Propagation delay | 5.0–14 ns - ensures sub-10 ns typical timing for real-time motor control loop closure. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, enabling direct integration into 400–800 V EV battery domains. |
| 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. |
| Fail-safe mode | Default-high output - guarantees known logic state during VDD1 loss in BMS fault detection paths. |
| CMTI | ≥60 kV/µs - suppresses false triggering in high-dV/dt environments like IGBT gate drivers and inverters. |
| Operating temperature | –40 to +125 °C - meets automotive under-hood and battery-pack thermal requirements. |
Pinout & Package
SI8621BT-AS2 uses a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage/clearance, optimized for reinforced insulation in high-voltage automotive systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Return path for input-side logic; must be decoupled locally with 0.1 µF capacitor. |
| VDD1 (Pin 3) | Side 1 power supply | Supplies input-side circuitry; UVLO threshold 2.24 V (typical) prevents metastable operation during brownout. |
| A1 (Pin 4), A2 (Pin 5) | Side 1 digital I/O | Two independent input channels with Schmitt-trigger inputs; compatible with 1.8–5.5 V logic families. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for output-side logic; galvanically separated from GND1 by ≥5 kVRMS barrier. |
| VDD2 (Pin 14) | Side 2 power supply | Supplies output-side driver; independent UVLO monitoring ensures safe behavior during asymmetric power loss. |
| B1 (Pin 13), B2 (Pin 12) | Side 2 digital I/O | Two isolated output channels; default-high fail-safe ensures active-low fault signals remain asserted during VDD1 failure. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift of optocouplers; enables stable 150 Mbps operation over full –40 to +125 °C range. |
| Selectably fail-safe output | 'T' in part number confirms default-high output state during VDD1 loss-critical for BMS overvoltage fault signaling. |
| 60 kV/µs CMTI | Prevents data corruption in high-noise traction inverter gate-drive feedback loops where dV/dt exceeds 50 kV/µs. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use with zero defects at 125 °C junction temperature and 1000-hour HTOL stress testing. |
| 50 Ω output impedance | Enables direct connection to 50 Ω PCB traces without external series termination-reducing BOM count in high-speed SPI isolation. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADC outputs and pack contactor control signals in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Dual-channel isolator providing reinforced barrier between low-voltage MCU and high-voltage battery domain; maintains <10 ns channel-to-channel skew for synchronized sampling. Use Value: Enables functional safety compliance (ISO 26262 ASIL-D) via certified 5 kVRMS isolation and AEC-Q100 qualification. | Use Scenario: Transmitting PWM gate-drive enable/disable signals and fault feedback from IGBT/SiC modules to MCU in electric vehicle inverters. IC Role / Device Role / Timing Role: High-CMTI isolator preserving signal integrity amid 10+ kV/µs common-mode transients generated during switching. Use Value: Prevents false turn-on/turn-off events that could cause shoot-through or overcurrent faults in high-power motor drives. |
| Onboard Charger (OBC) | Charging Station Communication |
Use Scenario: Isolating digital control signals between primary-side PFC controller and secondary-side DC-DC regulator in bidirectional OBCs. IC Role / Device Role / Timing Role: Dual-channel isolator supporting synchronous interleaved control with <2.5 ns pulse width distortion for precise phase alignment. Use Value: Reduces EMI and improves efficiency by enabling tight timing control across isolation barrier without added delay compensation. | Use Scenario: Isolating CAN FD communication lines between charging station controller and vehicle battery management system. IC Role / Device Role / Timing Role: High-speed isolator maintaining 2 Mbps CAN FD timing integrity while blocking ground-loop noise between AC grid and EV chassis. Use Value: Ensures reliable ISO 15118-compliant plug-and-charge handshaking even in noisy industrial charging environments. |
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 | 3.75 kVRMS basic isolation; no AEC-Q100 qualification; 25 Mbps max data rate. | Limited to industrial automation; not suitable for automotive high-voltage domains requiring reinforced insulation. | Choose only for cost-sensitive non-automotive designs where 5 kVRMS and 150 Mbps are unnecessary. |
| ISO7721FDWR | 5 kVRMS reinforced; AEC-Q100 qualified; but only 100 Mbps max data rate and 15 ns max propagation delay. | Acceptable for BMS monitoring but marginal for high-frequency gate-drive feedback in 20 kHz+ inverters. | Select when lower data rate suffices and TI's enhanced CMTI (85 kV/µs) is prioritized over Skyworks' timing precision. |
Compared with ADUM2201BRWZ and ISO7721FDWR, SI8621BT-AS2 uniquely combines automotive qualification, 150 Mbps bandwidth, <10 ns propagation delay, and 60 kV/µs CMTI-making it optimal for time-critical, safety-relevant EV powertrain subsystems where timing margin and isolation robustness are non-negotiable.
Availability
SI8621BT-AS2 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, onboard chargers, and charging station interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SI8621BT-AS2 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 engineered specifically for automotive and industrial isolation-delivering RF-based reliability, AEC-Q100 compliance, and reinforced safety certification where legacy optocouplers and capacitive isolators fall short.
FAQ
What is the isolation rating and safety certification status of SI8621BT-AS2?
SI8621BT-AS2 provides 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10 (reinforced), CSA IEC 62368-1, and CQC GB4943.1. These certifications validate its suitability for automotive battery domain isolation per ISO 26262 requirements. The 'T' in SI8621BT-AS2 confirms VDE-reinforced compliance and default-high fail-safe behavior.
Does SI8621BT-AS2 require external components for stable operation?
Yes-SI8621BT-AS2 requires a 0.1 µF bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the pins. No pull-up/pull-down resistors are needed: internal fail-safe circuitry (enabled by the 'T' suffix) provides default-high output states without external biasing.
How does the fail-safe mode function in SI8621BT-AS2 during power loss?
In SI8621BT-AS2, the 'T' suffix indicates selectable default-high fail-safe mode. When VDD1 is unpowered but VDD2 remains active, both B1 and B2 outputs are driven high-ensuring fault signals (e.g., overvoltage alerts) remain asserted. This behavior is defined in Table 3 of the datasheet and eliminates need for external latching circuits in BMS safety chains.
What is the maximum data rate supported by SI8621BT-AS2, and how is timing performance characterized?
SI8621BT-AS2 supports up to 150 Mbps data rate with typical propagation delay of 8 ns, pulse width distortion ≤1.5 ns, and channel-channel skew ≤0.5 ns. These values are measured under 5 V operation across –40 to +125 °C and enable precise timing in high-speed SPI, RS-485, and isolated ADC interfaces used in EV power electronics.
Is SI8621BT-AS2 pin-compatible with other devices in the Si86xx family?
No-SI8621BT-AS2 uses the WB SOIC-16 package with specific pin assignments (e.g., A2 on Pin 5, B2 on Pin 12) distinct from Si8620/Si8622 variants and incompatible with SOIC-8 versions. Pin compatibility is limited to same-part-number revisions; cross-family substitution requires layout revision due to differing channel count, pinout, and fail-safe configuration.
SI8621BT-AS2 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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8621BT-AS2 FAQ
1.How can I place an order for SI8621BT-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621BT-AS2 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-AS2 reliable?
The price and inventory of SI8621BT-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621BT-AS2 is usually 5 days.
3.What payment methods are accepted for SI8621BT-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621BT-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621BT-AS2?
SI8621BT-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621BT-AS2 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-AS2?
For technical support, including SI8621BT-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621BT-AS2 requirements.
6.How does Aetrix verify that SI8621BT-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8621BT-AS2 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-AS2 meets industry standards.
7.What is the process for return or replacement of SI8621BT-AS2?
All SI8621BT-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8621BT-AS2, 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-AS2 part is unused and in its original packaging.
Return procedure for SI8621BT-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621BT-AS2 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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