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Skyworks Solutions Inc. SI88422EC-ASR
- Part No.:
- SI88422EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88422EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,508
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Product details
Overview
SI88422EC-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 3.3/5.0 V isolated output), supporting up to 2 W average output power and 5000 VRMS isolation. It features two unidirectional RF-based isolation channels (A1/A2 → B1/B2), 100 Mbps max data rate, and 23 ns max propagation delay. It is used in industrial inverters and automotive motor control systems requiring reinforced insulation and AEC-Q100 qualification.
For engineers reviewing the SI88422EC-ASR datasheet, SI88422EC-ASR pinout, SI88422EC-ASR application, or SI88422EC-ASR equivalent, this page delivers verified specifications, SOIC-16 wide-body package mapping, confirmed pin functions (e.g., ESW, RSN, VSNS), automotive-grade thermal protection, and real-world design meaning for isolated power and signal integrity in high-noise environments.
Technical Context
The SI88422EC-ASR implements a modified flyback DC-DC topology with external NMOS switch drive via ESW and current sensing via RSN, enabling primary-side operation up to 24 V while delivering regulated 3.3/5.0 V on the secondary side. Its RF-based digital isolation uses on/off keying across a silicon dioxide barrier, providing 100 kV/µs transient immunity and eliminating optocoupler bias circuitry.
Unlike Si882xx/3xx variants, SI88422EC-ASR lacks SH/SH_FC and SS pins - shutdown and soft-start are not supported. It requires Type 1 loop compensation at COMP (RCOMP = 100 kΩ + CCOMP), and its VREGA pin supports external NPN regulation for VDDA when primary supply exceeds 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, VDE 62368-1, and CQC GB4943.1 reinforced insulation requirements. |
| Data Rate | Up to 100 Mbps - enables high-speed serial interfaces (e.g., SPI, RS-485) across isolation barrier without timing skew. |
| Propagation Delay | 23 ns max - ensures deterministic timing for real-time motor control and feedback loops. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side MCU, gate drivers, or sensors without external regulators. |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions. |
| Transient Immunity | 100 kV/µs typical - suppresses fast transients in motor drives and HV battery systems. |
| AEC-Q100 Grade | Qualified - supports PPAP documentation and IMDS/CAMDS compliance for automotive OEM programs. |
Pinout & Package
SI88422EC-ASR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 1.27 mm pitch) with creepage/clearance ≥ 8.3 mm per IEC 60664-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1, A2, HF XMTR, HF XMTR | Primary-side digital inputs (A1/A2) and RF transmitter outputs - drive forward channel signals into isolation barrier. |
| 5, 6, 7, 8 | GNDP, RSN, ESW, VDDA | Primary ground, current-sense input, external NMOS driver output, and primary-side logic supply (≤5.5 V). |
| 9, 10, 11, 12 | GNDA, VREGA, GNDB, VDDB | Primary signal ground, VDDA reference regulator output, secondary ground, and secondary logic supply (3.3/5.0 V). |
| 13, 14, 15, 16 | VSNS, COMP, NC, B1/B2/HF RCVR | Secondary-side voltage feedback input, compensation node for DC-DC loop, no-connect, and reverse-channel receiver outputs (B1/B2). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Flyback DC-DC Controller | Drives external NMOS (via ESW) and senses primary current (RSN) - enables 24 V → 5 V conversion without internal switches. |
| Secondary-Side Voltage Sensing | VSNS feedback eliminates optocouplers and improves load regulation ±1% over 10–100% load range. |
| RF-Based Digital Isolation | On/off keying architecture provides 100 kV/µs CMTI and 100 Mbps data rate with no startup initialization required. |
| VREGA Reference Output | Internal Zener-regulated 2.5 V reference (VREGA) powers external NPN transistor to generate VDDA when primary supply >5.5 V. |
| Thermal Shutdown Protection | Activates at junction temperature threshold to prevent permanent damage during overload or poor heatsinking. |
Applications
| Industrial Inverter Control | Automotive Traction Inverter |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current sense feedback between MCU and IGBT/SiC half-bridge in 400–800 V battery systems. IC Role / Device Role / Timing Role: SI88422EC-ASR provides dual-channel signal isolation plus 5 V isolated supply for gate driver ICs and ADC references. Use Value: Eliminates separate isolated DC-DC module, reduces BOM count by 3 components, and maintains <23 ns timing skew across channels. |
Use Scenario: Signal and power isolation in OBC (on-board charger) auxiliary power supplies and bidirectional DC-DC converters. IC Role / Device Role / Timing Role: SI88422EC-ASR delivers reinforced insulation (UL/VDE certified) and AEC-Q100 qualification for safety-critical 24 V → 5 V conversion and CAN/UART isolation. Use Value: Meets ISO 26262 ASIL-B functional safety requirements for power domain separation without external optocouplers or regulators. |
| PLC Analog I/O Module | Renewable Energy Solar Inverter |
Use Scenario: Isolating 4–20 mA current loop inputs and SPI-configured DAC outputs in modular PLC backplanes. IC Role / Device Role / Timing Role: SI88422EC-ASR isolates analog front-end control signals while powering isolated ADC/DAC rails from 24 V system bus. Use Value: Enables single-chip isolation + power solution with 5000 VRMS withstand voltage, reducing PCB area by 40% vs. discrete isolator + DC-DC combo. |
Use Scenario: Isolating MPPT controller communication and gate drive in string-level solar inverters operating at 1000 V DC input. IC Role / Device Role / Timing Role: SI88422EC-ASR provides galvanic separation for microcontroller UART and MOSFET gate signals, with 2 W isolated 5 V rail for sensor biasing. Use Value: Achieves >83% peak DC-DC efficiency using external Schottky diode and low-leakage transformer (e.g., UMEC UTB02250s), minimizing thermal stress. |
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 |
|---|---|---|---|
| SI88420EC-ASR | Same SOIC-16 package and pinout, but single forward + single reverse channel (A1→B1, A2←B2) instead of dual forward (A1→B1, A2→B2). | Suitable for bidirectional protocols (e.g., I²C) where reverse channel is required; not for dual unidirectional PWM. | Select SI88420EC-ASR only if reverse-direction isolation is needed; SI88422EC-ASR is optimal for dual forward control signals. |
| ADUM6422AARWZ | 4-channel isolator with integrated 5 V DC-DC (2 W), but uses transformer-based isolation (not RF), lower CMTI (75 kV/µs), and no AEC-Q100 rating. | Lacks automotive qualification and fails to meet 100 kV/µs transient immunity required in EV traction systems. | Choose ADUM6422AARWZ for cost-sensitive industrial applications without automotive or high-CMTI requirements. |
Compared with SI88422EC-ASR, SI88420EC-ASR offers bidirectional flexibility at the cost of reduced forward channel count, while ADUM6422AARWZ trades automotive robustness and RF noise immunity for broader channel count and legacy transformer compatibility.
Availability
SI88422EC-ASR is available at Aetrix Electronics and suitable for industrial inverters, automotive traction systems, and renewable energy solar inverters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88422EC-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 Si88xx family was engineered specifically for high-reliability isolated power and signal transfer in automotive, industrial, and energy infrastructure applications - emphasizing reinforced insulation, AEC-Q100 compliance, and integrated DC-DC efficiency.
FAQ
What is the maximum input voltage supported by SI88422EC-ASR's DC-DC converter?
The SI88422EC-ASR is designed for high-voltage-to-low-voltage configurations, supporting up to 24 V DC on the primary side (VDDA ≤ 5.5 V, supplied via VREGA + external NPN if needed). Its ESW and RSN pins enable external NMOS switching for safe operation at these voltages, unlike Si882xx/3xx variants limited to ≤5.5 V input.
Does SI88422EC-ASR support shutdown or soft-start functionality?
No. SI88422EC-ASR does not include SH/SH_FC or SS pins - shutdown and soft-start are not implemented in this variant. These features are present only in Si882xx, Si883xx, and Si886xx families. SI88422EC-ASR relies on external enable control of the primary supply or external FET gate driver for power sequencing.
What transformer is recommended for SI88422EC-ASR in a 24 V to 5 V application?
Skyworks validates UMEC UTB02250s (7–24 V input, 3.3–5.5 V output, 3.0:1 turns ratio, 5 kVRMS isolation) and Coilcraft TA7788-AL (12 V input, 5 V output, 5 kVRMS) for SI88422EC-ASR. Both meet leakage inductance (<600 nH) and primary inductance (25 µH ±5%) specs required for stable 2 W output regulation.
How is the isolated output voltage set on SI88422EC-ASR?
The isolated output voltage (VDDB) is set by an external resistor divider (R1/R2) connected to the VSNS pin. The formula is VOUT = VSNS × (1 + R1/R2) + IOFFSET × R1, where VSNS references an internal 1.22 V bandgap. This secondary-side sensing eliminates optocouplers and achieves ±1% load regulation.
Is SI88422EC-ASR pin-compatible with other Si884xx variants like SI88420EC-ASR?
Yes - SI88422EC-ASR shares identical SOIC-16 wide-body packaging and pinout with SI88420EC-ASR and SI88421EC-ASR. Channel configuration differs (dual forward vs. bidirectional), but PCB layout, footprint, and peripheral circuitry (transformer, RSN, ESW, VSNS, COMP) remain fully interchangeable.
SI88422EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x2x
- Package/Case:
- 16-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:
- 0/2
- 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:
- 16-SOIC
SI88422EC-ASR FAQ
1.How can I place an order for SI88422EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88422EC-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 SI88422EC-ASR reliable?
The price and inventory of SI88422EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88422EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88422EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88422EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88422EC-ASR?
SI88422EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88422EC-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 SI88422EC-ASR?
For technical support, including SI88422EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88422EC-ASR requirements.
6.How does Aetrix verify that SI88422EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88422EC-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 SI88422EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88422EC-ASR?
All SI88422EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88422EC-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 SI88422EC-ASR part is unused and in its original packaging.
Return procedure for SI88422EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88422EC-ASR Tags
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SI8710AC-B-ISR
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