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Skyworks Solutions Inc. SI88422BC-ASR
- Part No.:
- SI88422BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88422BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,105
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Product details
Overview
SI88422BC-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), delivering up to 2 W average output power, supporting data rates up to 100 Mbps, and providing 5000 VRMS reinforced isolation. It serves as a signal and power isolation solution in industrial motor control and EV battery management systems.
For engineers reviewing the SI88422BC-ASR datasheet, SI88422BC-ASR pinout, SI88422BC-ASR application, or SI88422BC-ASR equivalent, this page delivers verified specifications, SOIC-16 wide-body package mapping, confirmed pin functions including ESW and RSN for external FET drive and current sensing, and two validated alternative parts for high-voltage DC-DC isolation designs.
Technical Context
The SI88422BC-ASR implements RF-based capacitive isolation with silicon dioxide barrier, using on/off keying modulation for noise-immune digital channel operation. Its isolated flyback DC-DC controller operates in peak current mode, senses output voltage on the secondary side via VSNS, and transmits error feedback across the barrier without optocouplers.
This variant belongs to the Si884xx family optimized for primary-side input voltages >5.5 V (e.g., 24 V), requiring external NMOS switch driven by ESW and current sense via RSN. It lacks SH/SH_FC shutdown and SS soft-start pins-features reserved for Si883xx/Si886xx-confirming its fixed-frequency (250 kHz default), externally-switched architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, reinforced insulation) |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer signaling |
| Propagation Delay | 23 ns max - enables tight timing budgets in real-time motor control loops |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side microcontrollers, gate drivers, and sensors |
| Input Voltage Range | Up to 24 V on primary side - targets industrial HV rails and automotive 12/24 V battery domains |
| Transient Immunity | 100 kV/µs (typical) - withstands fast EFT/burst events in noisy factory or vehicle environments |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and industrial control applications |
Pinout & Package
SI88422BC-ASR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 7.5 mm, 2.65 mm height) with creepage/clearance ≥8.3 mm, certified for reinforced insulation per UL, VDE, and CQC standards.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1–A2, HF XMTR | Primary-side digital inputs (2 forward channels); HF XMTR pins carry modulated RF carrier for isolation barrier transmission |
| 5, 6 | GNDP, RSN | Primary-side power ground and external current-sense input for peak-current-mode DC-DC control loop |
| 7, 8 | ESW, VDDA | External NMOS gate driver output and primary-side logic supply (≤5.5 V required) |
| 9, 10 | GNDA, VREGA | Primary-side signal ground and internal voltage reference for external NPN regulator (used if VDDA not available) |
| 11, 12 | GNDB, VDDB | Secondary-side signal ground and isolated logic supply output (3.3/5.0 V) |
| 13, 14 | VSNS, COMP | Secondary-side feedback voltage input and compensation node for DC-DC loop stability (RCOMP = 100 kΩ) |
| 15, 16 | B1–B2, HF RCVR | Secondary-side digital outputs (2 reverse channels); HF RCVR pins demodulate RF signal into clean CMOS logic |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive RF isolation barrier | Silicon dioxide dielectric enables 5000 VRMS rating and 100 kV/µs CMTI without aging or wear-out mechanisms |
| Secondary-side voltage sensing | VSNS feedback eliminates optocoupler bias circuitry, improving line/load regulation and reducing BOM count |
| External switch control (ESW + RSN) | Enables safe, efficient 24 V primary-side operation with programmable current limiting and thermal derating |
| VREGA reference output | Provides stable 2.5 V reference to drive external NPN transistor, enabling VDDA generation when no ≤5.5 V rail exists |
| AEC-Q100 Grade 1 qualification | Validated for automotive subsystems including battery disconnect units and traction inverter gate drive supplies |
Applications
| Industrial Motor Drives | EV Battery Management Systems |
|---|---|
|
Use Scenario: Isolating gate drive signals and feedback from IGBTs/MOSFETs in 3-phase inverters while powering isolated gate drivers. IC Role / Device Role / Timing Role: Dual-channel isolator provides independent forward/reverse paths; integrated DC-DC powers secondary-side ISO5852S or similar gate drivers. Use Value: Eliminates separate isolated DC-DC module, reduces PCB area by >30%, and maintains <23 ns propagation delay for precise PWM timing. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs with microcontroller isolation and local sensor power. IC Role / Device Role / Timing Role: SI88422BC-ASR isolates UART/SPI communication between master MCU and slave monitoring ICs while supplying 5 V to each slave node. Use Value: Enables daisy-chained architecture with single transformer per module, achieving ±0.5% output regulation over temperature and load. |
| Programmable Logic Controllers | Isolated Industrial I/O Modules |
|
Use Scenario: Providing galvanic isolation between field-side analog/digital I/O and backplane CPU in modular PLC chassis. IC Role / Device Role / Timing Role: SI88422BC-ASR isolates digital status lines and powers isolated ADC/DAC reference supplies in 24 V-powered I/O cards. Use Value: Supports 24 V field bus compatibility, meets IEC 61000-4-5 surge immunity requirements, and sustains operation at 125 °C ambient. |
Use Scenario: Powering and isolating RS-485 transceivers in distributed I/O nodes connected to PROFIBUS or Modbus RTU networks. IC Role / Device Role / Timing Role: Delivers regulated 3.3 V to MAX1487E transceiver while isolating DE/RE control and data lines across 2 channels. Use Value: Achieves 100 Mbps data rate margin for burst-mode diagnostics, and maintains >8.3 mm creepage for Class I pollution degree 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 |
|---|---|---|---|
| SI88420BC-ASR | Same SOIC-16 package and pinout; differs in channel directionality (A1→B1, A2→B2 only; no reverse channels) | Not suitable for bidirectional protocols (e.g., I2C, half-duplex UART); limited to unidirectional signal flow | Select SI88420BC-ASR only when system requires forward-only isolation with identical power architecture. |
| ADUM6421AARIZ | Analog Devices part with 4 isolated channels, integrated 500 mW DC-DC, no external switch support, lower isolation (3750 VRMS) | Insufficient power for gate drivers; lacks RSN/ESW for 24 V input; unsuitable for >100 kV/µs EFT environments | Choose ADUM6421AARIZ only for low-power, space-constrained 4-channel applications where 24 V input and high CMTI are not required. |
Compared with SI88422BC-ASR, SI88420BC-ASR omits reverse-channel capability but retains identical DC-DC architecture, while ADUM6421AARIZ trades external switch flexibility and reinforced isolation for higher channel count and smaller footprint-making SI88422BC-ASR the only option supporting 24 V input, 2 W output, and bidirectional 100 Mbps isolation in SOIC-16.
Availability
SI88422BC-ASR is available at Aetrix Electronics and suitable for industrial motor drives, EV battery management systems, and isolated industrial I/O modules requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for SI88422BC-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 signal and power isolation in harsh environments-targeting industrial automation, electric vehicles, and energy infrastructure where reinforced insulation, high CMTI, and integrated DC-DC efficiency are critical.
FAQ
What is the maximum input voltage supported by the SI88422BC-ASR DC-DC converter?
The SI88422BC-ASR is designed for high-voltage primary-side operation, supporting input voltages up to 24 V. Its ESW and RSN pins enable use of an external NMOS switch and current-sense resistor, allowing safe and efficient conversion from 24 V rails without internal switch limitations. This distinguishes it from Si882xx/Si883xx variants rated only for ≤5.5 V input.
Does the SI88422BC-ASR support shutdown or soft-start functionality?
No, the SI88422BC-ASR does not include SH/SH_FC or SS pins. Shutdown and soft-start are features exclusive to Si883xx and Si886xx families. The SI88422BC-ASR operates with fixed 250 kHz switching frequency and no user-controllable startup sequencing-its design prioritizes simplicity and robustness in high-voltage flyback configurations.
What is the role of the VREGA pin on the SI88422BC-ASR?
VREGA provides a 2.5 V internal voltage reference used with an external NPN transistor, resistor, and capacitor to generate VDDA when no ≤5.5 V supply is available on the primary side. This eliminates the need for a separate linear regulator, simplifying power architecture in systems powered directly from 24 V battery or industrial rails.
Can the SI88422BC-ASR be used for bidirectional communication protocols like I2C?
No-SI88422BC-ASR provides two unidirectional channels (A1→B1, A2→B2) and two reverse channels (B1→A1, B2→A2), but its pinout and internal architecture do not support true bidirectional open-drain signaling required by I2C. It is suitable for SPI, RS-485, and UART full-duplex links, but not for protocols requiring shared bus arbitration.
What transformer is recommended for use with the SI88422BC-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 SI88422BC-ASR. These parts meet required 3:1 turns ratio, ≤600 nH leakage inductance, 25 µH primary inductance, and 5 kVRMS isolation-ensuring stable regulation, low EMI, and compliance with reinforced insulation standards.
SI88422BC-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
SI88422BC-ASR FAQ
1.How can I place an order for SI88422BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88422BC-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 SI88422BC-ASR reliable?
The price and inventory of SI88422BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88422BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88422BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88422BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88422BC-ASR?
SI88422BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88422BC-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 SI88422BC-ASR?
For technical support, including SI88422BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88422BC-ASR requirements.
6.How does Aetrix verify that SI88422BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88422BC-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 SI88422BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88422BC-ASR?
All SI88422BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88422BC-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 SI88422BC-ASR part is unused and in its original packaging.
Return procedure for SI88422BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88422BC-ASR Tags
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