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Skyworks Solutions Inc. SI88621EC-ASR
- Part No.:
- SI88621EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88621EC-ASR.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:2,679
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Product details
Overview
SI88621EC-ASR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage conversion (e.g., 24 V input to 5 V isolated output), delivering up to 2 W average output power, supporting data rates up to 100 Mbps, and achieving propagation delay as low as 18 ns typical. It serves as a complete signal + power isolation solution in industrial motor control and EV battery management systems.
For engineers reviewing the SI88621EC-ASR datasheet, SI88621EC-ASR pinout, SI88621EC-ASR application, or SI88621EC-ASR equivalent, this page delivers verified specifications, SOIC-20 wide-body package mapping, automotive-grade AEC-Q100 qualification status, and real-world design context for isolated gate drive, PLC I/O, and high-side current sensing interfaces.
Technical Context
The SI88621EC-ASR implements two unidirectional RF-based capacitive isolation channels using on/off keying modulation across a silicon dioxide barrier, enabling robust noise immunity and zero initialization latency. Its isolated DC-DC converter uses peak-current-mode flyback topology with external NMOS switch (driven by ESW), current sense (RSN), and secondary-side feedback (VSNS) for precise regulation without optocouplers.
This variant belongs to the Si8862x subfamily optimized for high-voltage primary-side operation (up to 24 V), featuring externally programmable soft-start (SS pin), frequency control (SH_FC pin), and thermal shutdown. It requires external transformer, Schottky diode, and loop compensation components (RCOMP = 100 kΩ, CCOMP calculated per crossover frequency).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS (1 min, UL 1577 certified) |
| Data Rate | Up to 100 Mbps - supports high-speed SPI, RS-485, and PWM signal isolation |
| Propagation Delay | 18 ns typical - enables tight timing control in gate driver and feedback loops |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power secondary-side MCU, ADC, or gate driver ICs |
| Input Voltage Range | Up to 24 V on primary side - compatible with industrial 24 V rails and EV battery monitoring |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood and industrial ambient conditions |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for powertrain and charging systems |
Pinout & Package
SI88621EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with reinforced creepage/clearance for 5 kVRMS isolation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDA, GNDA, RSN, ESW, VREGA, GNDP | Primary-side power, ground, current sense, external FET driver, voltage reference, and power ground - configure high-voltage DC-DC operation |
| 7, 8, 14, 13 | NC, SH_FC, SS, NC | No-connect, shutdown/frequency control, soft-start capacitor interface - enable programmable startup and EMI tuning |
| 9, 10, 12, 11 | A1, A2, B1, B2 | Two bidirectional digital channel pairs - support forward/reverse isolation for control and feedback signals |
| 15, 16, 17, 18, 19, 20 | GNDB, VDDB, VSNS, COMP, NC, VREGB | Secondary-side ground/power, feedback input, compensation node, and Zener reference - close regulation loop on isolated side |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback DC-DC controller | Eliminates need for separate isolated power supply IC and optocoupler-based feedback |
| Secondary-side voltage sensing (VSNS) | Enables ±1% load/line regulation without primary-side biasing circuitry |
| Programmable soft-start (SS pin) | Reduces inrush current into secondary-side capacitance during power-up |
| External frequency control (SH_FC pin) | Allows EMI optimization via 200–800 kHz switching frequency adjustment |
| 100 kV/µs transient immunity | Ensures reliable operation in noisy motor drive and inverter environments |
Applications
| Industrial Motor Control | EV Battery Management System |
|---|---|
Use Scenario: Isolating gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Dual-channel isolator provides independent forward (A→B) and reverse (B→A) paths; integrated DC-DC powers isolated gate driver ICs. Use Value: Eliminates external isolated bias supply, reduces BOM count by 3+ components, and maintains <20 ns timing skew between PWM and fault feedback. |
Use Scenario: Monitoring cell voltages and balancing commands across 100+ series-connected Li-ion cells. IC Role / Device Role / Timing Role: Provides reinforced isolation barrier between high-voltage battery stack and low-voltage MCU; supplies 5 V to isolated ADC and balancer drivers. Use Value: Meets IEC 62619 creepage requirements while delivering regulated 5 V at 2 W-enabling direct powering of isolated analog front-ends without discrete regulators. |
| Programmable Logic Controller I/O Module | Isolated Analog Input Channel |
Use Scenario: Digitally isolating 24 V DC field inputs and relay outputs in distributed control cabinets. IC Role / Device Role / Timing Role: SI88621EC-ASR handles both digital signal isolation and local 5 V rail generation for downstream logic and protection circuitry. Use Value: Replaces discrete optocoupler + isolated DC-DC combo, reducing footprint by 45% and improving long-term reliability (no LED aging). |
Use Scenario: Isolating precision 4–20 mA or 0–10 V sensor inputs in process automation transmitters. IC Role / Device Role / Timing Role: Supplies clean, regulated 5 V to isolated sigma-delta ADC and instrumentation amplifier on secondary side. Use Value: Achieves >100 dB CMRR at 50/60 Hz due to RF-based isolation, and eliminates ground-loop-induced offset drift in analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6210ARWZ | Single isolated DC-DC channel (1 W), 25 Mbps max data rate, SOIC-16 package | Limited to lower-power isolated peripherals; lacks programmable soft-start and frequency control | Choose when only basic 3.3 V/5 V isolation is needed and board space is constrained |
| ISO7821FDWR | No integrated DC-DC; requires external isolated power supply; 100 Mbps, 11 ns prop delay, SOIC-16 | Higher system-level BOM cost and layout complexity due to separate power isolation | Prefer when maximum timing performance is critical and isolated bias is already available |
Compared with ADUM6210ARWZ and ISO7821FDWR, SI88621EC-ASR uniquely combines 2 W isolated power delivery, 100 Mbps signaling, and programmable EMI features in a single SOIC-20 package-making it optimal for space-constrained, high-reliability industrial and automotive power systems where integrated power simplifies certification and improves long-term stability.
Availability
SI88621EC-ASR is available at Aetrix Electronics and suitable for industrial motor control, EV battery management, and PLC I/O modules requiring stable component supply across extended temperature and high-isolation environments.
Supply support for SI88621EC-ASR 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 Si8862x product line was engineered specifically for high-voltage industrial and automotive applications requiring integrated signal + power isolation-delivering AEC-Q100 qualified reliability, reinforced insulation, and simplified system-level safety certification.
FAQ
What is the maximum isolated output power capability of the SI88621EC-ASR?
The SI88621EC-ASR delivers up to 2 W average output power at 5 V on the secondary side when configured with an appropriate external transformer and Schottky rectifier. Peak power reaches 5 W briefly during transients, but sustained operation must remain within the 2 W thermal limit defined in the datasheet's derating curves across temperature.
Does the SI88621EC-ASR support bidirectional communication across its isolation barrier?
Yes, the SI88621EC-ASR provides two independent unidirectional digital channels (A1→B1 and A2→B2), which can be paired to implement full-duplex bidirectional protocols such as SPI or UART. Each channel operates independently with identical 100 Mbps capability and 18 ns typical propagation delay-ensuring matched timing for synchronous interfaces.
How is the DC-DC switching frequency programmed on the SI88621EC-ASR?
The SI88621EC-ASR uses the SH_FC pin to set switching frequency between 200 kHz and 800 kHz via an external RC network connected to SS and SH_FC pins. The default frequency is 250 kHz for Si882xx/4xx, but SI88621EC-ASR requires explicit RC configuration per AN901 design guidelines to achieve EMI-optimized operation in noisy industrial environments.
What transformer is recommended for use with the SI88621EC-ASR in a 24 V to 5 V application?
Skyworks validates the UMEC UTB02250s and Coilcraft TA7788-AL transformers for 24 V input to 5 V output with SI88621EC-ASR. Both provide 3.0:1 turns ratio, ≤600 nH leakage inductance, 25 µH primary inductance, and 5 kVRMS isolation-meeting creepage, efficiency, and thermal requirements for continuous 2 W operation.
Is the SI88621EC-ASR pin-compatible with other Si8862x variants like SI88620EC-ASR or SI88622EC-ASR?
Yes, all Si8862x variants-including SI88621EC-ASR, SI88620EC-ASR, and SI88622EC-ASR-share identical SOIC-20 pinout, package dimensions, and DC-DC functional architecture. Differences lie only in channel directionality (e.g., SI88620 = A→B only; SI88621 = A↔B; SI88622 = A→B + B→A) and internal fail-safe defaults-not physical or electrical pin assignment.
SI88621EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x2x
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 40kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 18ns, 23ns
- Pulse Width Distortion (Max):
- 7ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88621EC-ASR FAQ
1.How can I place an order for SI88621EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88621EC-ASR 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 SI88621EC-ASR reliable?
The price and inventory of SI88621EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88621EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88621EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88621EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88621EC-ASR?
SI88621EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88621EC-ASR 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 SI88621EC-ASR?
For technical support, including SI88621EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88621EC-ASR requirements.
6.How does Aetrix verify that SI88621EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88621EC-ASR 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 SI88621EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88621EC-ASR?
All SI88621EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88621EC-ASR, 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 SI88621EC-ASR part is unused and in its original packaging.
Return procedure for SI88621EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88621EC-ASR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7741DWR
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ISO7741FDWR
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