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Skyworks Solutions Inc. SI88420BC-ASR
- Part No.:
- SI88420BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88420BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
SI88420BC-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). It delivers up to 2 W average isolated power, supports 0–100 Mbps data rates, achieves ≤23 ns max propagation delay, and provides 5000 VRMS reinforced isolation. It is used in industrial motor control systems requiring galvanic separation between gate drivers and MCU logic.
For engineers reviewing the SI88420BC-ASR datasheet, SI88420BC-ASR pinout, SI88420BC-ASR application, or SI88420BC-ASR equivalent, this page details its SOIC-20 wide-body package, external-FET-driven flyback topology, AEC-Q100 qualification, –40 to +125 °C operation, and fail-safe digital channel behavior under UVLO conditions.
Technical Context
The SI88420BC-ASR implements two unidirectional CMOS digital isolation channels using RF on-off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and no startup initialization. Its isolated DC-DC converter uses peak-current-mode-controlled flyback topology with external NMOS switch (driven by ESW), current sensing via RSN, and secondary-side voltage feedback via VSNS.
This variant belongs to the Si8842x family optimized for high-voltage primary-side inputs (up to 24 V), requiring VDDA ≤ 5.5 V and supporting programmable switching frequency (250 kHz default) but omitting SH shutdown and SS soft-start pins-unlike Si882xx/3xx. Compensation at COMP uses fixed 100 kΩ RCOMP with external CCOMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, VDE 62368-1, CSA 62368-1, CQC GB4943.1 |
| Data Rate | 0 to 100 Mbps - supports high-speed SPI, RS-485, and digital I/O isolation without timing bottlenecks |
| Propagation Delay | ≤23 ns max - enables precise timing-critical applications like PWM gate driving and encoder interfacing |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power isolated side logic (VDDB), gate drivers, and small peripherals |
| Operating Temperature | –40 to +125 °C - qualified for automotive and industrial environments with extended thermal margin |
| Transient Immunity | 100 kV/µs typical - ensures reliable operation in noisy motor drive and inverter EMI environments |
| AEC-Q100 Grade | Qualified - supports automotive-grade production with PPAP, IMDS/CAMDS documentation readiness |
Pinout & Package
SI88420BC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch), optimized for creepage/clearance compliance in high-voltage industrial designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | HF XMTR / HF RCVR / GNDP / RSN / ESW / VDDA | Primary-side RF transmitters (A1/A2), receivers (B1/B2), power ground, current sense input, external switch driver, and signal supply - enables 24 V primary-side operation with external FET |
| 7, 8, 9, 10 | GNDA / VREGA / A1 / A2 | Primary-side signal ground, internal voltage reference for VDDA regulation (when >5.5 V required), and forward digital channel inputs |
| 11, 12, 13, 14 | B1 / B2 / GNDB / VDDB | Isolated-side digital channel outputs, secondary ground, and isolated-side signal supply - powers downstream logic or gate drivers |
| 15, 16, 17, 18 | VSNS / COMP / NC / NC | Secondary-side voltage feedback node, compensation network connection (100 kΩ + CCOMP), and no-connect pins - enables precise closed-loop regulation without optocouplers |
| 19, 20 | NC / NC | No-connect pins - must remain unconnected per design; not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| Dual unidirectional digital isolation | Two independent 100 Mbps channels (A1→B1, A2→B2) with 18 ns typical prop delay - ideal for isolated SPI clock/data or dual PWM signals |
| Integrated flyback DC-DC controller | Drives external NMOS switch (ESW pin), senses current (RSN), regulates output via VSNS feedback - eliminates optocoupler-based feedback complexity |
| VREGA reference output | Internal Zener-referenced pin supporting external NPN regulator for VDDA when primary supply exceeds 5.5 V - removes need for separate LDO |
| Reinforced safety certification | UL 1577 (5000 VRMS), VDE 62368-1, CSA 62368-1, CQC GB4943.1 - certified for functional safety architectures in PLCs and inverters |
| High EMI immunity | 100 kV/µs common-mode transient immunity and dithered PWM control - maintains signal integrity in 600 V bus switching environments |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in 400 V traction inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing timing-aligned gate drive enable/disable and desaturation fault reporting across 5000 VRMS barrier. Use Value: Enables safe, fast-response protection with ≤23 ns propagation delay and 100 kV/µs CMTI - prevents shoot-through during rapid bus transients. |
Use Scenario: Galvanically separating cell monitoring ICs (e.g., LTC6813) from central BMS MCU in 800 V EV battery packs. IC Role / Device Role / Timing Role: Provides isolated 5 V power (2 W) and bidirectional digital isolation for voltage/current telemetry and balancing commands. Use Value: Eliminates external isolated DC-DC and optocouplers - reduces BOM count while meeting AEC-Q100 and reinforced insulation requirements. |
| Programmable Logic Controllers | Isolated Industrial Sensors |
Use Scenario: Signal and power isolation for analog input modules receiving 4–20 mA or ±10 V field signals in factory automation. IC Role / Device Role / Timing Role: Supplies isolated 3.3 V for ADC and interface ICs while transmitting digitized sensor data across barrier. Use Value: Achieves <30 µV RMS noise floor in isolated data acquisition due to low-EMI RF modulation and 5000 VRMS creepage compliance. |
Use Scenario: Isolating MEMS pressure or temperature sensors in hazardous-area process instrumentation (e.g., oil & gas transmitters). IC Role / Device Role / Timing Role: Delivers intrinsically safe isolated power (<60 V) and digital data path compliant with IEC 60079-11. Use Value: Supports SIL-2 functional safety via certified reinforced insulation and AEC-Q100 reliability - no external safety components needed. |
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 |
|---|---|---|---|
| ADUM6420AARWZ | 4-channel isolator with integrated 500 mW DC-DC; uses iCoupler magnetic coupling; 25 kV/µs CMTI; SOIC-20 | Lower isolated power (0.5 W) and lower CMTI limit - unsuitable for high-noise inverter gate drive | Select when only low-power isolated logic is needed and magnetic coupling is preferred over capacitive |
| ISO7842FDWR | 2-channel isolator only (no DC-DC); requires external isolated power; 100 Mbps; 80 kV/µs CMTI; SOIC-16 | No integrated power conversion - adds BOM cost and layout complexity for isolated bias supply | Select when system already provides isolated 3.3/5 V and maximum CMTI is critical for ultra-high-noise environments |
Compared with ADUM6420AARWZ and ISO7842FDWR, SI88420BC-ASR uniquely combines 2 W isolated power delivery, 100 kV/µs CMTI, and AEC-Q100 qualification in a single SOIC-20 package - making it optimal for space-constrained, high-reliability motor control and automotive BMS where integrated power and extreme noise immunity are mandatory.
Availability
SI88420BC-ASR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, programmable logic controllers, and isolated sensor interfaces requiring stable component supply across long production lifecycles.
Supply support for SI88420BC-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 Si8842x product line was engineered specifically for high-voltage-to-low-voltage isolated power and signal transfer in automotive traction inverters and industrial motor drives - emphasizing AEC-Q100 reliability, 5000 VRMS safety, and external-FET flexibility.
FAQ
What is the maximum isolated output power of the SI88420BC-ASR?
The SI88420BC-ASR delivers up to 2 W average isolated output power at 5 V, enabled by its external NMOS-switch-driven flyback DC-DC controller. Peak power capability exceeds 5 W with proper transformer and thermal design, but continuous operation is rated at 2 W per the datasheet's thermal limits and derating curves across –40 to +125 °C.
Does the SI88420BC-ASR support shutdown or soft-start functionality?
No - unlike Si882xx/3xx variants, the SI88420BC-ASR does not include SH (shutdown) or SS (soft-start) pins. This is explicitly stated in Section 2.3.1 of the datasheet: "This feature is not available on the Si884xx." Startup is controlled solely by undervoltage lockout (UVLO) thresholds on VDDA and VDDB.
What transformer is recommended for use with the SI88420BC-ASR in a 24 V to 5 V application?
The UMEC UTB02250s and Coilcraft TA7788-AL are validated transformers for 24 V input to 5 V output with SI88420BC-ASR. Both provide 3.0:1.0 turns ratio, ≥25 µH primary inductance, ≤600 nH leakage inductance, and 5 kVRMS isolation - matching the device's external-FET flyback requirements per AN901 design guide.
How is compensation configured on the SI88420BC-ASR DC-DC controller?
Compensation for the SI88420BC-ASR DC-DC controller uses a Type 1 loop with fixed 100 kΩ resistor (RCOMP) from COMP to GNDB and an external capacitor (CCOMP) from COMP to GNDB. The capacitance value is calculated per the equation CCOMP = 1/(2π × fC × RCOMP), where fC is the desired crossover frequency - detailed in Section 2.3.7 of the datasheet.
Is the SI88420BC-ASR pin-compatible with other Si8842x variants like SI88421 or SI88422?
No - SI88420BC-ASR has a unique pin configuration among Si8842x devices. Figure 3 shows SI88420 uses pins 1–6 for HF XMTR/XMTR/RCVR/RCVR/GNDP/RSN, whereas SI88421 and SI88422 assign different functions (e.g., SH_FC, SS) to those positions. Pin mapping must be verified per each variant's specific diagram; direct substitution is not supported.
SI88420BC-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:
- 2/0
- 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
SI88420BC-ASR FAQ
1.How can I place an order for SI88420BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88420BC-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 SI88420BC-ASR reliable?
The price and inventory of SI88420BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88420BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88420BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88420BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88420BC-ASR?
SI88420BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88420BC-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 SI88420BC-ASR?
For technical support, including SI88420BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88420BC-ASR requirements.
6.How does Aetrix verify that SI88420BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88420BC-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 SI88420BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88420BC-ASR?
All SI88420BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88420BC-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 SI88420BC-ASR part is unused and in its original packaging.
Return procedure for SI88420BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88420BC-ASR Tags
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