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Skyworks Solutions Inc. SI88621BD-ASR
- Part No.:
- SI88621BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88621BD-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,716
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Product details
Overview
SI88621BD-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), supporting up to 2 W average output power, 100 Mbps data rate, and 5000 VRMS isolation rating. It serves as a self-powered signal isolator in industrial motor control and EV inverter gate drive circuits.
For engineers reviewing the SI88621BD-ASR datasheet, SI88621BD-ASR pinout, SI88621BD-ASR application, or SI88621BD-ASR equivalent, this page delivers verified specifications, SOIC-20 wide-body package mapping, functional pin roles, automotive-grade AEC-Q100 qualification, and validated alternative options for high-voltage isolated power + signal transfer designs.
Technical Context
The SI88621BD-ASR implements capacitive RF-based digital isolation with two unidirectional CMOS channels (A1/A2 → B1/B2), using on/off keying modulation for noise immunity and 18 ns typical propagation delay. Its isolated DC-DC converter uses external NMOS switching (via ESW pin) and current sensing (RSN pin) in peak-current-mode flyback topology.
This variant is configured for high-voltage primary-side operation (up to 24 V), requires external transformer and rectifier, and features programmable soft-start (SS pin), shutdown (SH_FC pin), and frequency control (SH_FC/SS RC network). Compensation at COMP pin uses fixed 100 kΩ RCOMP with external CCOMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577 certified) |
| Data Rate | Up to 100 Mbps - supports high-speed SPI, RS-485, and PWM feedback in motor drives |
| Propagation Delay | 18 ns typical - enables precise timing-critical gate drive synchronization |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power secondary-side MCU, gate drivers, or sensors |
| Input Voltage Range | Up to 24 V on primary side - compatible with industrial 24 V rails and EV battery monitoring systems |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - meets automotive reliability and stress-test requirements |
Pinout & Package
SI88621BD-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 5000 VRMS isolation. Pin 1 is marked with dot; isolation barrier separates pins 1–10 (primary side) from pins 11–20 (secondary side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Digital isolator primary-side supply | Must be ≤5.5 V; powers A1/A2 transmitter circuitry and internal logic |
| GNDA | Primary-side signal ground | Reference for A1/A2 inputs and UVLO monitoring on Side A |
| A1, A2 | Primary-side digital input channels | Unidirectional CMOS inputs; accept 3.3 V or 5 V logic levels |
| ESW | External switch driver output | Drives external NMOS FET (Q1) in high-voltage flyback configuration |
| RSN | Current sense input | Monitors primary-side switch current via shunt resistor for peak-current-mode control |
| SH_FC | Shutdown and frequency control | High-level assertion disables DC-DC; RC network sets 200–800 kHz switching frequency |
| SS | Soft-start control | External capacitor sets startup ramp time to limit inrush current into transformer |
| VREGA | Internal voltage reference output | Used with external NPN transistor to generate regulated VDDA when primary supply >5.5 V |
| VDDB | Secondary-side digital supply | Powered by isolated DC-DC output; supplies B1/B2 receiver circuitry |
| GNDB | Secondary-side signal ground | Reference for B1/B2 outputs and VSNS feedback loop |
| B1, B2 | Secondary-side digital output channels | Unidirectional CMOS outputs; drive 3.3 V or 5 V loads with rail-to-rail swing |
| VSNS | DC-DC output voltage feedback | Resistor divider from VDDB connects here to set regulated output voltage (e.g., 5 V) |
| COMP | DC-DC error amplifier compensation | External RCOMP = 100 kΩ + CCOMP provides Type I loop stability for flyback control |
| NC | No-connect terminal | Pins 9, 13, 14, 17, 19 are internally unconnected - must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback DC-DC controller with external FET support | Enables 24 V → 5 V isolated conversion without optocouplers or secondary LDOs |
| Programmable soft-start and shutdown | SS pin capacitor sets controlled ramp; SH_FC pin allows system-level power sequencing |
| RF-based capacitive isolation architecture | Delivers 100 kV/µs transient immunity and superior magnetic field rejection vs. opto/inductive isolators |
| Secondary-side voltage sensing with isolated feedback | Eliminates need for optocoupler biasing circuitry - improves load regulation and long-term reliability |
| AEC-Q100 qualified and automotive PPAP support | Validated for automotive subsystems requiring IMDS/CAMDS documentation and AIAG-compliant processes |
Applications
| Industrial Motor Control | EV Inverter Gate Drive |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent forward (A→B) signal paths plus isolated 5 V supply for gate driver ICs. Use Value: Enables compact, self-powered gate drive stage with 18 ns prop delay for tight dead-time control and 5000 VRMS reinforced insulation for 690 V AC bus systems. |
Use Scenario: Signal and power isolation in traction inverter control units for hybrid/electric vehicles. IC Role / Device Role / Timing Role: Provides isolated communication (e.g., DESAT feedback, PWM input) and local 5 V rail for isolated gate drivers in high-noise 400–800 V battery domains. Use Value: Meets AEC-Q100 requirements and supports 24 V primary input directly from vehicle body electronics, reducing external regulator count. |
| Isolated PLC I/O Modules | Renewable Energy Inverters |
Use Scenario: Digital isolation of discrete I/O and analog front-end signals in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Dual-channel isolator delivering isolated 5 V power and bidirectional data paths for sensor interface and actuator control circuits. Use Value: SOIC-20 wide-body footprint satisfies IPC-2221 creepage requirements for 300 V working voltage; eliminates separate DC-DC module. |
Use Scenario: Isolating MPPT controller signals and gate drive commands in solar string inverters with 1000 V DC input. IC Role / Device Role / Timing Role: Supplies isolated 5 V power and transmits fast-switching control signals across reinforced barrier in high-dV/dt environments. Use Value: 100 kV/µs common-mode transient immunity prevents false triggering during lightning surge events; UL/VDE-certified isolation ensures grid compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6210ARWZ | Integrated internal power switches; max 2 W output; no external FET support; 5000 VRMS isolation | Best for low-voltage (3–5 V) input systems; not suitable for 24 V primary-side operation | Select when primary supply ≤5.5 V and board space constraints prohibit external MOSFET + transformer |
| ISO7821FDWWR | Signal-only isolator (no DC-DC); 8000 VRMS; 100 Mbps; SOIC-16; requires external isolated power | Requires separate isolated DC-DC converter (e.g., ISOW7841); higher BOM count but greater flexibility in output voltage selection | Select when design mandates highest isolation rating or needs non-standard output voltages (e.g., 15 V, 24 V) |
Compared with ADUM6210ARWZ, SI88621BD-ASR supports 24 V primary input and external FET control for higher efficiency at elevated input voltages; compared with ISO7821FDWWR, it integrates power conversion to reduce component count and PCB area in space-constrained industrial modules.
Availability
SI88621BD-ASR is available at Aetrix Electronics and suitable for industrial motor control, EV inverter gate drive, and isolated PLC I/O modules requiring stable component supply, automotive-grade reliability, and integrated isolated power delivery.
Supply support for SI88621BD-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 targets high-reliability isolated power + signal transfer in automotive and industrial systems, specifically engineered for 24 V primary-side operation with external FET control, AEC-Q100 qualification, and reinforced safety certification.
FAQ
What is the maximum input voltage supported by the SI88621BD-ASR DC-DC converter?
The SI88621BD-ASR is designed for high-voltage primary-side operation, supporting input voltages up to 24 V. Its ESW pin drives an external NMOS FET, and RSN pin enables current sensing-making it suitable for industrial 24 V rails and automotive battery domains. Input above 5.5 V requires use of VREGA with external NPN transistor to regulate VDDA.
Does the SI88621BD-ASR include integrated power switches or require external components for DC-DC operation?
The SI88621BD-ASR does not include integrated high-voltage power switches. It requires an external NMOS FET (driven by ESW), current-sense resistor (connected to RSN), transformer, rectifier diode, and output capacitor. This architecture enables efficient 24 V → 5 V conversion while maintaining thermal performance and design flexibility.
What isolation certifications apply to the SI88621BD-ASR?
The SI88621BD-ASR is UL 1577 recognized (5000 VRMS, 1 minute), CSA 62368-1 certified (reinforced insulation), VDE 62368-1 compliant, and CQC GB4943.1 approved. It also meets AEC-Q100 Grade 1 requirements for automotive applications, including temperature cycling, HTOL, and ESD testing.
Can the SI88621BD-ASR support programmable switching frequency and soft-start?
Yes. The SI88621BD-ASR supports both features via the SH_FC and SS pins. An RC network between SH_FC and SS sets the switching frequency from 200 kHz to 800 kHz. A capacitor from SS to GNDA configures soft-start duration to limit inrush current during power-up-critical for transformer-based isolated supplies.
What is the role of the VREGA pin on the SI88621BD-ASR?
VREGA is an internal voltage reference output used with an external NPN transistor, resistor, and capacitor to generate a regulated VDDA supply when the primary-side input exceeds 5.5 V. This eliminates the need for a separate linear regulator and enables direct 24 V operation while keeping VDDA within its 2.3–5.5 V specification.
SI88621BD-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
SI88621BD-ASR FAQ
1.How can I place an order for SI88621BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88621BD-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 SI88621BD-ASR reliable?
The price and inventory of SI88621BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88621BD-ASR is usually 5 days.
3.What payment methods are accepted for SI88621BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88621BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88621BD-ASR?
SI88621BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88621BD-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 SI88621BD-ASR?
For technical support, including SI88621BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88621BD-ASR requirements.
6.How does Aetrix verify that SI88621BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI88621BD-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 SI88621BD-ASR meets industry standards.
7.What is the process for return or replacement of SI88621BD-ASR?
All SI88621BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88621BD-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 SI88621BD-ASR part is unused and in its original packaging.
Return procedure for SI88621BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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