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Skyworks Solutions Inc. SI8621EC-AS
- Part No.:
- SI8621EC-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8621EC-AS.pdf
- Description:
- AUTOMOTIVE 3.75 KV 1 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
SI8621EC-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 Schmitt-trigger inputs, selectable fail-safe output (default low), and operates from 2.5–5.5 V across –40 to +125 °C - used in isolated ADC interfaces and motor control gate drivers.
For engineers reviewing the SI8621EC-AS datasheet, SI8621EC-AS pinout, SI8621EC-AS application, or SI8621EC-AS equivalent, key selection criteria include its 5 kVRMS reinforced insulation per VDE 0884-10, dual-channel unidirectional configuration, 1.5 ns typical pulse width distortion, and compatibility with high-noise industrial bus interfaces requiring >50 kV/µs CMTI.
Technical Context
The SI8621EC-AS 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 power domains (VDD1/VDD2), each with dedicated undervoltage lockout (UVLO+ = 2.24 V, UVLO– = 2.16 V) and fail-safe logic state control.
It delivers precise timing performance: 0.5 ns typical channel-channel skew, 2 ns propagation delay skew, and 5 ns minimum pulse width - critical for synchronous sampling in isolated current sensing and PWM feedback loops. The device meets reinforced insulation requirements per VDE 0884-10 and IEC 62368-1, validated for 60-year life at rated working voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed serial interfaces like isolated SPI and RS-485 transceiver control. |
| Isolation rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, enabling use in mains-connected industrial equipment. |
| Propagation delay | 5.0–14 ns - ensures sub-10 ns timing consistency for real-time control loop closure in motor drives. |
| Channel-channel skew | 0.4–2.5 ns - maintains phase alignment between dual feedback signals in isolated dual-shunt current sensing. |
| Supply voltage | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V gate drivers without level shifters. |
| CMTI | 50–100 kV/µs - rejects fast transients in high-dV/dt environments such as IGBT/SiC inverter switching nodes. |
| Fail-safe mode | Default low output - ensures safe shutdown of downstream power stages during VDD1 loss in isolated DC-DC controllers. |
Pinout & Package
SI8621EC-AS uses a wide-body SOIC-16 (WB SOIC-16) package with 8.0 mm creepage/clearance, optimized for reinforced insulation in high-voltage systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 7) | Side 1 ground reference | Return path for VDD1 domain; must be star-connected to minimize ground bounce in isolated signal chains. |
| VDD1 (Pin 3) | Side 1 supply input | Powers input-side logic and RF transmitter; requires 0.1 µF bypass capacitor placed adjacent to pin. |
| A1 (Pin 4) | Side 1 digital input | Unidirectional input channel 1 - accepts 2.0 V VIH / 0.8 V VIL logic levels with Schmitt-trigger hysteresis (0.44 V typ). |
| A2 (Pin 5) | Side 1 digital input | Unidirectional input channel 2 - electrically identical to A1; supports independent signal routing on same side. |
| GND2 (Pins 9, 16) | Side 2 ground reference | Isolated return for VDD2 domain; separates noisy power-stage grounds from controller-side references. |
| VDD2 (Pin 14) | Side 2 supply input | Powers output-side logic and RF receiver; enables biasing of isolated gate drivers or ADC reference circuits. |
| B1 (Pin 13) | Side 2 digital output | Unidirectional output channel 1 - drives 4 mA loads with VOH ≥ VDD2–0.4 V and VOL ≤ 0.4 V. |
| B2 (Pin 12) | Side 2 digital output | Unidirectional output channel 2 - matches B1 timing specs; supports parallel isolated control of dual half-bridges. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift; provides stable propagation delay (<10 ns) over –40 to +125 °C. |
| Selectably fail-safe output | Factory-configured default-low state ensures gate drivers disable during primary-side power loss in isolated SMPS. |
| High CMTI (≥50 kV/µs) | Rejects common-mode noise from fast-switching SiC/MOSFETs, preventing false triggering in motor control feedback paths. |
| Low power at 100 Mbps | 5.8 mA per side at 5 V - reduces thermal load in densely packed inverters versus optocoupler alternatives. |
| Reinforced VDE 0884-10 certification | Validated for 5 kVRMS working voltage and 10 kV surge; satisfies safety requirements for Class I medical and industrial equipment. |
Applications
| Isolated ADC Interface | Motor Control Gate Driver |
|---|---|
Use Scenario: Isolating analog-to-digital converter digital interface (e.g., SPI clock/data lines) in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Dual-channel unidirectional isolator transmitting SCLK and MOSI from MCU to isolated ADC, maintaining <2.5 ns inter-channel skew for synchronized sampling. Use Value: Enables ±0.1% measurement accuracy by eliminating ground-loop-induced offset and rejecting >50 kV/µs transients from nearby power converters. | Use Scenario: Providing isolated gate drive signals to high-side and low-side IGBTs in three-phase traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator delivering complementary PWM signals with matched propagation delay (≤14 ns) and <0.5 ns channel skew to prevent shoot-through. Use Value: Supports 20 kHz switching frequency with 50 ns dead-time margin, improving inverter efficiency and reliability in EV powertrains. |
| Isolated Switch-Mode Supply | Industrial PLC Digital I/O |
Use Scenario: Isolating feedback signals (voltage/current sense) and control commands in 1 kW isolated DC-DC converters for telecom rectifiers. IC Role / Device Role / Timing Role: Dual-channel isolator transmitting error amplifier output and enable signals across primary-secondary barrier with fail-safe default-low behavior. Use Value: Ensures immediate shutdown of secondary-side regulation during primary-side brownout, meeting IEC 62368-1 fault response requirements. | Use Scenario: Galvanically isolating 24 V digital input channels in programmable logic controllers for factory automation. IC Role / Device Role / Timing Role: Dual-channel isolator conditioning field-side 24 V signals into 3.3 V logic for FPGA/CPU, using Schmitt-trigger inputs for noise immunity. Use Value: Achieves >1000 V transient protection and 1500 V working voltage compliance, reducing external TVS count and PCB area by 30%. |
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-supply (3.0–5.5 V), 150 Mbps, 3.75 kVRMS basic isolation, SOIC-8 package. | Lacks reinforced insulation and failsafe mode; unsuitable for mains-connected equipment requiring VDE 0884-10. | Choose for cost-sensitive, low-voltage, non-safety-critical digital isolation where creepage >5.5 mm is not required. |
| ISO6721DR | Dual-channel, 50 Mbps max, 5 kVRMS reinforced, SOIC-8, no fail-safe option. | Lower data rate limits use in high-speed SPI; lacks configurable default output state for safety-critical shutdown. | Prefer when 50 Mbps suffices and board space constraints favor SOIC-8 over WB SOIC-16. |
Compared with ADUM120N0BRZ-RL7 and ISO6721DR, SI8621EC-AS uniquely combines 150 Mbps speed, 5 kVRMS reinforced certification, and factory-set fail-safe low output - making it the only option qualified for automotive OBCs and industrial inverters demanding simultaneous high bandwidth, safety compliance, and functional safety behavior.
Availability
SI8621EC-AS is available at Aetrix Electronics and suitable for industrial automation systems, battery management systems, and isolated switch-mode supplies requiring stable component supply and long-term lifecycle support.
Supply support for SI8621EC-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 designed specifically for high-reliability industrial and automotive isolation applications, emphasizing ultra-low power, precise timing, and reinforced safety certification across extended temperature ranges.
FAQ
What is the isolation rating and safety certification of the SI8621EC-AS?
The SI8621EC-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 approvals validate its use in safety-critical systems including medical electronics and industrial motor drives where double insulation is mandated.
Does the SI8621EC-AS require external components for stable operation?
Yes - the SI8621EC-AS requires a 0.1 µF ceramic bypass capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed within 2 mm of the respective pins. No pull-up/pull-down resistors are needed, as Schmitt-trigger inputs and fail-safe logic are integrated.
How does the fail-safe mode function in the SI8621EC-AS?
The SI8621EC-AS is factory-configured for default-low fail-safe operation: when VDD1 is unpowered but VDD2 remains active, both B1 and B2 outputs drive logic low. This ensures safe deactivation of downstream power devices during input-side power loss, as confirmed in Table 3 of the datasheet.
What is the maximum data rate supported by the SI8621EC-AS?
The SI8621EC-AS supports data rates from DC up to 150 Mbps under standard operating conditions (VDD = 2.5–5.5 V, TA = –40 to +125 °C). This enables use in high-speed isolated communication links such as SPI clock distribution and encoder feedback in servo drives.
Can the SI8621EC-AS operate with different supply voltages on each side?
Yes - the SI8621EC-AS supports independent VDD1 and VDD2 supplies ranging from 2.5 V to 5.5 V each. This allows interfacing a 3.3 V microcontroller (Side A) with a 5 V isolated gate driver (Side B) without external level translation circuitry.
SI8621EC-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- 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):
- 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:
- 8-SOIC
SI8621EC-AS FAQ
1.How can I place an order for SI8621EC-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8621EC-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 SI8621EC-AS reliable?
The price and inventory of SI8621EC-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8621EC-AS is usually 5 days.
3.What payment methods are accepted for SI8621EC-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8621EC-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8621EC-AS?
SI8621EC-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8621EC-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 SI8621EC-AS?
For technical support, including SI8621EC-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8621EC-AS requirements.
6.How does Aetrix verify that SI8621EC-AS is sourced from the original manufacturer or authorized distributors?
All SI8621EC-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 SI8621EC-AS meets industry standards.
7.What is the process for return or replacement of SI8621EC-AS?
All SI8621EC-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8621EC-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 SI8621EC-AS part is unused and in its original packaging.
Return procedure for SI8621EC-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8621EC-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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