My Inquiry
My Account
Skyworks Solutions Inc. SI8621BT-AS
- Part No.:
- SI8621BT-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8621BT-AS.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:4,532
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8621BT-AS 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 rating. It features selectable fail-safe output (default high), operates from 2.5–5.5 V, and delivers ultra-low power consumption-1.9 mA per channel at 1 Mbps (2.5 V) and 5.8 mA per channel at 100 Mbps (5 V). It is widely deployed in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8621BT-AS datasheet, SI8621BT-AS pinout, SI8621BT-AS application, or SI8621BT-AS equivalent, key selection criteria include reinforced VDE 0884-10 certification, 125 °C operating temperature, channel-channel skew ≤2.5 ns, CMTI ≥50 kV/µs, and compatibility with 3.3 V/5 V mixed-supply systems requiring bidirectional signal integrity across isolation barriers.
Technical Context
The SI8621BT-AS implements RF-based on/off keying modulation 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 supply domains (VDD1/VDD2), each with dedicated undervoltage lockout (UVLO+ = 2.24 V, UVLO– = 2.16 V) and Schmitt-trigger inputs for >0.44 V hysteresis.
It integrates precise timing control with typical 8 ns propagation delay, 0.5 ns channel-channel skew, and 5 ns minimum pulse width-enabling reliable high-speed serial communication (e.g., SPI, RS-485 isolated transceivers) and PWM signal transfer in inverters. Fail-safe mode is factory-configured to default-high output during VDD1 loss while VDD2 remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed SPI, UART, and digital encoder feedback without protocol translation. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, enabling use in mains-connected industrial and automotive BMS applications. |
| Propagation delay | 5–14 ns - ensures sub-10 ns timing accuracy critical for synchronous gate driving and real-time control loops. |
| Channel-channel skew | ≤2.5 ns - maintains phase alignment between dual PWM or differential encoder signals across isolation boundary. |
| Supply voltage | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | ≥50 kV/µs - rejects fast common-mode transients in motor drives and inverters, preventing false triggering. |
| Operating temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient environments without derating. |
| Fail-safe mode | Default-high output - ensures safe logic-high state on isolated outputs during input-side power loss (e.g., MCU reset). |
Pinout & Package
SI8621BT-AS is housed in a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage/clearance, supporting reinforced insulation per VDE 0884-10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Return path for VDD1 domain; must be connected to controller-side ground plane with low-inductance layout. |
| VDD1 (Pin 3) | Side 1 power supply | Supplies isolator transmitter side; requires 0.1 µF bypass capacitor placed adjacent to pin. |
| A1 (Pin 4) | Side 1 digital I/O | Primary input/output channel on low-voltage side; compatible with CMOS/TTL logic levels. |
| A2 (Pin 5) | Side 1 digital I/O | Secondary input/output channel on low-voltage side; electrically isolated but co-located with A1 on Side 1. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Return path for VDD2 domain; galvanically separated from GND1 to maintain isolation barrier integrity. |
| VDD2 (Pin 14) | Side 2 power supply | Supplies isolator receiver side; independent of VDD1, enabling level-shifting and fault containment. |
| B1 (Pin 13) | Side 2 digital I/O | Primary isolated output/input channel on high-voltage side; drives gate drivers or ADC references. |
| B2 (Pin 12) | Side 2 digital I/O | Secondary isolated channel on high-voltage side; supports dual feedback paths or redundant signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Enables single-package isolation for functional safety architectures (e.g., ASIL-B) without external creepage extenders. |
| Selectably fail-safe output (default high) | Guarantees known logic state during brown-out or MCU reset, preventing undefined gate driver activation in motor control. |
| Ultra-low power at 100 Mbps | 5.8 mA per channel at 5 V enables thermally constrained designs in sealed enclosures or high-density PCBs. |
| Schmitt-trigger inputs with 0.44 V hysteresis | Rejects >440 mV of noise on signal lines, eliminating need for external RC filtering in noisy industrial environments. |
| 60-year life at rated working voltage | Validated reliability metric supports long-lifecycle deployments in infrastructure and automotive applications. |
| No start-up initialization required | Eliminates firmware delays and configuration sequences-output follows input within 40 µs of VDD stabilization. |
Applications
| Motor Control Gate Driving | Isolated ADC/DAC Interface |
|---|---|
|
Use Scenario: Isolating PWM signals from MCU to half-bridge gate drivers in 3-phase inverters for EV traction motors. IC Role / Device Role / Timing Role: Dual-channel isolator transferring complementary PWM pairs with <2.5 ns skew to ensure shoot-through prevention. Use Value: Enables precise timing alignment and 5 kVRMS reinforcement required for 800 V DC bus systems compliant with IEC 61800-5-1. |
Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to host processor in battery pack monitoring units. IC Role / Device Role / Timing Role: Transmitting high-resolution current/voltage sampling data across isolation barrier with 150 Mbps capability. Use Value: Supports 24-bit resolution at 20 kSPS without oversampling bottlenecks, maintaining SNR integrity across isolation. |
| Onboard Charger (OBC) Control | Traction Inverter Signal Conditioning |
|
Use Scenario: Isolating digital control signals between AC/DC PFC stage and DC/DC LLC stage in automotive OBC modules. IC Role / Device Role / Timing Role: Bidirectional data transfer for status reporting and fault signaling with fail-safe default-high behavior. Use Value: Ensures safe shutdown state during primary-side power interruption, meeting ISO 26262 ASIL-C diagnostic coverage requirements. |
Use Scenario: Conditioning resolver-to-digital converter (RDC) feedback signals in high-power traction inverters. IC Role / Device Role / Timing Role: Isolating 10-bit RDC parallel outputs with <10 ns propagation delay to preserve position accuracy. Use Value: Maintains <0.1° electrical angle error at 20 kHz rotor speed, critical for field-oriented control stability. |
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 | Basic isolation only (3.75 kVRMS), no VDE 0884-10 reinforcement; 25 kV/µs CMTI; SOIC-8 package. | Limited to non-safety-critical industrial automation; not suitable for automotive BMS or OBC where reinforced insulation is mandated. | Choose when cost sensitivity outweighs safety certification needs and board space is constrained. |
| ISO6721FDWR | Reinforced 5 kVRMS (VDE-certified), but only 50 Mbps max data rate and higher 8.5 mA @100 Mbps equivalent current draw. | Acceptable for lower-speed CAN or isolated sensor interfaces, but insufficient for high-bandwidth resolver or fast SPI. | Prefer for TI ecosystem designs requiring CSD compliance and lower EMI, but verify timing budget for >50 Mbps links. |
Compared with ADUM2201BRWZ and ISO6721FDWR, SI8621BT-AS uniquely combines VDE-reinforced 5 kVRMS isolation, 150 Mbps bandwidth, and fail-safe default-high operation in a single WB SOIC-16 package-making it the only option qualified for ASIL-B automotive subsystems requiring both speed and safety certification.
Availability
SI8621BT-AS is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, and onboard charger designs requiring stable component supply, long-term lifecycle support, and full regulatory traceability.
Supply support for SI8621BT-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, wireless infrastructure, and high-reliability isolation technologies.
The Si86xx family was engineered specifically for demanding industrial and automotive isolation applications-delivering RF-based digital isolation with reinforced safety certification, ultra-low power, and precision timing in compact packages.
FAQ
What is the isolation rating and safety certification status of the SI8621BT-AS?
The SI8621BT-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA IEC 62368-1, VDE 0884-10 (reinforced), and CQC GB4943.1. These certifications validate its suitability for safety-critical applications including automotive battery management systems and industrial inverters where reinforced insulation is mandated by IEC 61800-5-1 and ISO 26262.
Does the SI8621BT-AS require external components for stable operation?
Yes-the SI8621BT-AS requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed as close as possible to the respective pins. No pull-up/pull-down resistors are needed due to integrated fail-safe circuitry and Schmitt-trigger inputs, though series termination (50–300 Ω) may be added in highly noisy environments per layout guidelines.
How does the fail-safe mode function in the SI8621BT-AS?
The SI8621BT-AS is configured at manufacture for default-high fail-safe operation: when VDD1 is unpowered (e.g., MCU reset) but VDD2 remains active, outputs B1 and B2 drive logic high. This prevents undefined states in gate drivers or analog monitoring circuits. The behavior is fixed per ordering code-SI8621BT-AS does not support runtime reconfiguration.
What is the maximum data rate supported by the SI8621BT-AS, and how is signal integrity maintained?
The SI8621BT-AS supports up to 150 Mbps with guaranteed 5 ns minimum pulse width and peak eye diagram jitter of 350 ps. Signal integrity is preserved via RF-based modulation (superior to pulse-width schemes), 50 Ω nominal output impedance matched to controlled-impedance PCB traces, and 50 kV/µs common-mode transient immunity-ensuring clean edges even in high-dV/dt motor drive environments.
Can the SI8621BT-AS operate with mismatched supply voltages on Side 1 and Side 2?
Yes-SI8621BT-AS supports independent VDD1 and VDD2 supplies ranging from 2.5 V to 5.5 V each. This enables level-shifting between 3.3 V microcontrollers and 5 V gate drivers or ADC references without external translators. Each side has its own UVLO monitor, ensuring correct behavior even during asymmetric power sequencing.
SI8621BT-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):
- 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-AS FAQ
1.How can I place an order for SI8621BT-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621BT-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 SI8621BT-AS reliable?
The price and inventory of SI8621BT-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621BT-AS is usually 5 days.
3.What payment methods are accepted for SI8621BT-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621BT-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621BT-AS?
SI8621BT-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621BT-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 SI8621BT-AS?
For technical support, including SI8621BT-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621BT-AS requirements.
6.How does Aetrix verify that SI8621BT-AS is sourced from the original manufacturer or authorized distributors?
All SI8621BT-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 SI8621BT-AS meets industry standards.
7.What is the process for return or replacement of SI8621BT-AS?
All SI8621BT-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621BT-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 SI8621BT-AS part is unused and in its original packaging.
Return procedure for SI8621BT-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621BT-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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
