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Skyworks Solutions Inc. SI88621BC-ASR
- Part No.:
- SI88621BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88621BC-ASR.pdf
- Description:
- AUTOMOTIVE 3.75 KV 2-CHANNEL DIG
- Quantity:
- Payment:
- Shipping:
Inventory:4,626
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Product details
Overview
SI88621BC-ASR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power, supporting 0–100 Mbps data rates, and providing 5000 VRMS isolation. It features externally programmable switching frequency (200–800 kHz), soft-start control, and shutdown functionality - designed for high-reliability industrial and automotive isolated power and signal interfaces.
For engineers reviewing the SI88621BC-ASR datasheet, SI88621BC-ASR pinout, SI88621BC-ASR application, or SI88621BC-ASR equivalent, this device serves as a complete isolated signal + power solution requiring only an external transformer, rectifier, and minimal passive components - eliminating optocouplers and secondary LDOs in systems like motor drives and battery management.
Technical Context
The SI88621BC-ASR implements RF-based capacitive isolation across two unidirectional channels using silicon dioxide barriers, with on/off keying modulation for superior noise immunity and <18 ns typical propagation delay. Its isolated DC-DC converter uses peak-current-mode flyback control with secondary-side voltage sensing via VSNS feedback.
This variant belongs to the Si8862x family optimized for high-voltage-to-low-voltage conversion (e.g., 24 V input to 3.3/5 V isolated output), featuring ESW driver output, RSN current sense input, SH_FC shutdown/frequency control, and SS soft-start pins - all supporting AEC-Q100 qualification and operation from –40 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, and VDE 62368-1. |
| Data Rate | 0–100 Mbps - supports high-speed serial interfaces including SPI, RS-485, and CAN FD without timing constraints. |
| Propagation Delay | 18 ns typical, 23 ns max - enables precise timing-critical applications such as gate driving and real-time control loops. |
| DC-DC Output Power | Up to 5 W peak with external power switch - sufficient to power isolated microcontrollers, ADCs, and transceivers without auxiliary supplies. |
| Input Voltage Range | Up to 24 V primary-side input - supports direct connection to industrial bus rails and automotive battery domains. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and harsh industrial environments. |
| Transient Immunity | 100 kV/µs (typical) - ensures robust operation in noisy motor drive and inverter applications. |
Pinout & Package
SI88621BC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm, certified for reinforced insulation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | GNDP, RSN, ESW, VDDA, GNDA, SH_FC | Primary-side ground, current sense, external switch driver, signal supply, signal ground, and combined shutdown/frequency control. |
| 7, 8, 9, 10 | NC, NC, A1, A2 | No-connect pins; two forward-direction digital input channels referenced to VDDA/GNDA. |
| 11, 12, 13, 14 | B1, B2, NC, SS | Two reverse-direction digital output channels referenced to VDDB/GNDB; soft-start timing capacitor connection. |
| 15–20 | VREGA, GNDB, VDDB, VSNS, COMP, NC | Internal reference output, isolated ground, isolated signal supply, feedback input for regulated output voltage, compensation network node, and no-connect. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary-side sensing | Eliminates optocoupler-based feedback, improving line/load regulation and reducing component count by ≥3 vs. discrete solutions. |
| Externally programmable switching frequency | 200–800 kHz tuning via RC network on SH_FC/SS pins - enables EMI optimization without redesigning transformer or layout. |
| Soft-start and shutdown control | Capacitor-programmable startup ramp (SS) and logic-level shutdown (SH_FC) - prevents inrush current and allows system-level power sequencing. |
| High transient immunity & low emissions | 100 kV/µs common-mode transient immunity and dithered PWM - maintains signal integrity in 600 V+ IGBT gate-drive environments. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and traction inverters - includes PPAP documentation and IMDS support. |
Applications
| Industrial Motor Drives | Automotive Battery Management Systems |
|---|---|
Use Scenario: Isolating gate-drive signals and feedback from 600 V IGBTs in variable-frequency drives. IC Role / Device Role / Timing Role: Dual-channel isolator provides independent forward (PWM command) and reverse (fault reporting) paths; integrated DC-DC powers isolated gate driver ICs. Use Value: Enables single-chip isolation + bias supply, reducing board area by 40% and eliminating secondary LDOs and optocouplers. |
Use Scenario: Monitoring cell voltages and communicating with MCU across isolation barrier in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Provides reinforced insulation between high-voltage stack monitor and low-voltage controller; DC-DC powers isolated ADC and communication interface. Use Value: Meets ASIL-B functional safety requirements via 5000 VRMS rating and AEC-Q100 qualification - no additional safety certification needed. |
| Isolated PLC Analog I/O Modules | Renewable Energy Inverters |
Use Scenario: Digitally isolating 4–20 mA loop transmitter outputs and analog input front-ends in distributed control systems. IC Role / Device Role / Timing Role: Transmits sensor data and control commands across isolation barrier; integrated DC-DC supplies isolated op-amps and DACs. Use Value: Supports 24 V field-side input while delivering regulated 5 V to isolated analog circuitry - simplifies power architecture and improves EMC performance. |
Use Scenario: Isolating DC-link voltage sensing and MPPT controller signals in solar string inverters operating at 1000 V DC. IC Role / Device Role / Timing Role: Delivers high-CMTI isolation for fast-switching SiC MOSFET gate drivers and provides isolated 3.3 V supply for current-sense amplifiers. Use Value: Withstands >100 kV/µs transients during hard switching - prevents false triggering and ensures reliable grid synchronization. |
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 | 2-channel isolator + 500 mW isolated DC-DC; fixed 2.5 MHz switching; no programmable frequency or soft-start. | Limited to low-power isolated logic; insufficient for powering gate drivers or ADCs requiring >1 W. | Select when board space is critical and isolated power demand is ≤500 mW - not suitable for SI88621BC-ASR's 5 W capability. |
| ISO7821FDWWR | 2-channel isolator only - no integrated DC-DC; requires external isolated power supply. | Needs separate isolated DC-DC converter (e.g., ISOW7841), increasing BOM count and layout complexity. | Choose only if existing design already includes isolated bias supply and maximum integration is not required. |
Compared with ADUM6210ARWZ and ISO7821FDWWR, SI88621BC-ASR uniquely combines 5 W isolated power delivery, 100 Mbps speed, programmable frequency, and AEC-Q100 qualification - making it the only drop-in solution for automotive and industrial systems needing both high-power isolation and timing-critical signal transfer.
Availability
SI88621BC-ASR is available at Aetrix Electronics and suitable for industrial motor drives, automotive battery management systems, and renewable energy inverters requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI88621BC-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 for wireless, automotive, and industrial markets.
The Si8862x product line was developed to deliver fully integrated, high-power digital isolation for next-generation electric vehicles and Industry 4.0 systems - combining robust safety certification, programmable power control, and extreme EMI resilience in a single SOIC-20 package.
FAQ
What is the maximum isolated output power supported by the SI88621BC-ASR?
The SI88621BC-ASR supports up to 5 W peak isolated output power when used with an external NMOS power switch driven by the ESW pin. This is achieved in high-voltage-to-low-voltage configurations (e.g., 24 V input to 5 V output) and requires appropriate transformer selection per AN901 guidelines. The SI88621BC-ASR itself does not include internal power switches - its 5 W capability depends on external FET and transformer implementation.
Does the SI88621BC-ASR support programmable switching frequency, and how is it configured?
Yes, the SI88621BC-ASR supports programmable PWM frequency from 200 kHz to 800 kHz using an external RC network connected between SH_FC and SS pins. This configuration replaces the default internal oscillator and allows EMI optimization without changing transformer turns ratio or compensation components. The SI88621BC-ASR datasheet specifies exact resistor/capacitor values for target frequencies in Section 2.3.3.
What isolation certifications apply to the SI88621BC-ASR?
The SI88621BC-ASR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1 (conformity), and CQC GB4943.1. It also meets VDE 60747-17 basic insulation requirements (pending final validation). These certifications confirm suitability for reinforced insulation in industrial and automotive end-equipment requiring functional safety compliance.
Can the SI88621BC-ASR be used in high-voltage-to-high-voltage configurations (e.g., 24 V to 24 V)?
Yes, the SI88621BC-ASR supports high-voltage-to-high-voltage conversion (e.g., 24 V input to 24 V isolated output) using external power switch Q1 and current sense resistor R4 as shown in Figure 10 of the datasheet. This configuration requires careful transformer selection (e.g., Mentech TTER09-0568S1) and loop compensation per AN901, but retains full 5000 VRMS isolation and AEC-Q100 qualification.
What is the role of the VREGA pin on the SI88621BC-ASR?
The VREGA pin on the SI88621BC-ASR provides an internal voltage reference (≈1.24 V) used with an external NPN transistor, resistor, and capacitor to generate a regulated supply for VDDA when primary-side input exceeds 5.5 V. This eliminates the need for a separate linear regulator in high-input-voltage applications - a feature explicitly documented for Si8862x devices in Section 2.3.5 of the datasheet.
SI88621BC-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
SI88621BC-ASR FAQ
1.How can I place an order for SI88621BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88621BC-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 SI88621BC-ASR reliable?
The price and inventory of SI88621BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88621BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88621BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88621BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88621BC-ASR?
SI88621BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88621BC-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 SI88621BC-ASR?
For technical support, including SI88621BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88621BC-ASR requirements.
6.How does Aetrix verify that SI88621BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88621BC-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 SI88621BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88621BC-ASR?
All SI88621BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88621BC-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 SI88621BC-ASR part is unused and in its original packaging.
Return procedure for SI88621BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88621BC-ASR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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