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Skyworks Solutions Inc. SI88420EC-ASR
- Part No.:
- SI88420EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88420EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,472
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Product details
Overview
SI88420EC-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 5 W peak isolated power, supports 100 Mbps data rate, achieves ≤23 ns propagation delay, and provides 5000 VRMS reinforced isolation. It is used in industrial inverters and EV battery management systems requiring galvanic separation and local isolated power.
For engineers reviewing the SI88420EC-ASR datasheet, SI88420EC-ASR pinout, SI88420EC-ASR application, or SI88420EC-ASR equivalent, key selection considerations include its external-switch DC-DC topology, SOIC-20 wide-body package, AEC-Q100 qualification, –40 to +125 °C operation, and absence of shutdown/soft-start pins-distinguishing it from Si883xx/Si886xx variants.
Technical Context
The SI88420EC-ASR implements two unidirectional RF-based capacitive isolation channels using on/off keying modulation across a silicon dioxide barrier, delivering robust noise immunity and no startup initialization requirement. Its isolated DC-DC converter uses an external flyback transformer, NMOS switch (driven by ESW), and current-sense resistor (RSN) for primary-side control.
This variant is configured for high-voltage input (up to 24 V) to low-voltage output (3.3/5.0 V) conversion, with secondary-side voltage sensing via VSNS and internal error amplifier feedback. It lacks SH/SH_FC and SS pins-confirming no shutdown or soft-start functionality-and uses 100 kΩ RCOMP for loop compensation per datasheet Section 2.3.7.
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 - enables real-time motor control and fast serial interface isolation |
| Propagation Delay | ≤23 ns max - supports tight timing budgets in gate driver and feedback loops |
| DC-DC Output Power | Up to 5 W peak - powers isolated MCU peripherals and sensors without external regulators |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - withstands high dv/dt noise in IGBT/MOSFET switching environments |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for production ECUs and BMS |
Pinout & Package
SI88420EC-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 per UL/VDE/CSA standards.
| Pin/Terminal | 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 |
| 7, 8, 9, 10 | GNDA / VREGA / GNDB / VDDB | Primary signal ground, internal voltage reference output, secondary ground, and secondary signal supply |
| 11, 12, 13, 14 | VSNS / COMP / NC / A1 | Secondary-side feedback input, compensation node, no-connect, and forward channel input |
| 15, 16, 17, 18 | A2 / B1 / B2 / DNC/VREGB | Forward channel input, reverse channel outputs, and do-not-connect voltage reference (output >5.5 V only) |
| 19, 20 | NC / NC | No-connect pins - must be left floating per datasheet Table 1 |
Key Features
| Feature | Design Value |
|---|---|
| RF-based capacitive isolation | Eliminates optocoupler aging and temperature drift; enables 100 Mbps with 18 ns typical prop delay |
| External-switch flyback DC-DC | Supports 24 V primary inputs and precise secondary-side regulation without optocouplers or bias windings |
| VREGA voltage reference | Enables local generation of VDDA ≤5.5 V from high-voltage rails-no external LDO required |
| 100 kV/µs CMTI | Ensures reliable operation in noisy motor drive and inverter gate driver circuits with fast switching edges |
| SOIC-20 wide-body layout | Provides 8.3 mm creepage for reinforced isolation-meets IEC 62368-1 and UL 1577 safety standards |
Applications
| Industrial Inverters | Automotive Battery Management |
|---|---|
Use Scenario: Isolating gate drive signals and ADC feedback in 3-phase motor inverters operating at 600–1200 V bus voltages. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent forward (A→B) and reverse (B→A) signal paths with <23 ns timing skew. Use Value: Enables safe, high-speed communication across isolation barrier while powering isolated gate drivers and current sensors from same IC. |
Use Scenario: Monitoring cell voltages and balancing commands in high-voltage EV battery packs (≥400 V). IC Role / Device Role / Timing Role: Provides reinforced isolation between microcontroller domain and high-side monitoring circuitry with AEC-Q100 reliability. Use Value: Eliminates need for separate isolated DC-DC and digital isolators-reducing BOM count and PCB area in compact BMS modules. |
| Programmable Logic Controllers | Isolated Data Acquisition |
Use Scenario: Signal conditioning and I/O isolation in modular PLC backplanes handling mixed 24 V DC and fieldbus interfaces. IC Role / Device Role / Timing Role: Supplies isolated 5 V power to downstream analog front-ends while transmitting status and control data bidirectionally. Use Value: Supports hot-swap capability and noise immunity in electrically noisy factory floor environments with >100 kV/µs transient suppression. |
Use Scenario: Isolating precision ADCs and sensor interfaces in medical or test equipment requiring 5 kVRMS patient/safety isolation. IC Role / Device Role / Timing Role: Delivers low-jitter, low-propagation-delay isolation for synchronized sampling clocks and data streams. Use Value: Maintains signal integrity at 100 Mbps while providing certified reinforced isolation-meeting IEC 60601-1 creepage requirements. |
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 |
|---|---|---|---|
| SI88421EC-ASR | Single forward + single reverse channel (A1→B1, B2→A2); identical DC-DC architecture and SOIC-20 package | Used where asymmetric bidirectional signaling suffices (e.g., SPI clock/data + ready signal) | Select when channel directionality matches system protocol-not a drop-in replacement for SI88420EC-ASR's dual-forward configuration |
| ADUM6420ARWZ | 4-channel isolator + integrated DC-DC; uses iCoupler magnetic isolation; 2.5 kVRMS rating; SOIC-20W package | Limited to 2 W output power and lower CMTI (50 kV/µs); not AEC-Q100 qualified | Choose for cost-sensitive industrial applications where 5 kVRMS and automotive qualification are not required |
Compared with SI88420EC-ASR, SI88421EC-ASR offers matched pinout and DC-DC performance but different channel mapping, while ADUM6420ARWZ trades isolation strength and automotive compliance for higher channel count and magnetic isolation simplicity-requiring careful review of safety margin and thermal derating.
Availability
SI88420EC-ASR is available at Aetrix Electronics and suitable for industrial inverters, automotive battery management systems, and isolated data acquisition requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88420EC-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 Si88x2x family-including SI88420EC-ASR-is engineered for high-reliability isolated power and signal transfer in automotive, industrial, and energy infrastructure applications, emphasizing reinforced safety certification and high-voltage operational robustness.
FAQ
What is the isolation voltage rating of the SI88420EC-ASR?
The SI88420EC-ASR is rated for 5000 VRMS isolation for one minute per UL 1577, with reinforced insulation certification per IEC 62368-1 and VDE 62368-1. This rating applies across the full SOIC-20 wide-body creepage distance (≥8.3 mm) and is validated for continuous operation in industrial and automotive environments meeting CSA and CQC safety requirements.
Does the SI88420EC-ASR support shutdown or soft-start functionality?
No, the SI88420EC-ASR does not include shutdown (SH/SH_FC) or soft-start (SS) pins-unlike Si883xx or Si886xx variants. Its pinout omits these functions entirely (pins 6 and 7 are RSN and ESW), confirming fixed-operation DC-DC behavior. Startup is controlled solely by UVLO thresholds on VDDA and VDDB, with no user-controllable sequencing.
What transformer is recommended for use with the SI88420EC-ASR in a 24 V to 5 V design?
Skyworks validates the UMEC UTB02250s and Coilcraft TA7788-AL transformers for 24 V input to 5 V output with SI88420EC-ASR. These provide 3.0:1 turns ratio, ≤600 nH leakage inductance, 25 µH primary inductance, and 5 kVRMS isolation-matching the external-switch flyback requirements and ensuring stable regulation per AN901 design guidelines.
How is the DC-DC output voltage set on the SI88420EC-ASR?
The SI88420EC-ASR senses output voltage on the secondary side via the VSNS pin using an external resistor divider (R1/R2). The controller compares this to an internal 1.22 V reference and adjusts duty cycle accordingly. The formula is VOUT = 1.22 × (1 + R1/R2) + IOFFSET × R1, where IOFFSET is a small current term specified in the datasheet.
Is the SI88420EC-ASR pin-compatible with other Si8842x variants like SI88422EC-ASR?
No-SI88420EC-ASR (dual-forward: A1→B1, A2→B2) has different pin assignments than SI88422EC-ASR (dual-reverse: B1→A1, B2→A2). While both use SOIC-20 and share DC-DC pins (ESW, RSN, VSNS, COMP), their A/B channel mappings are inverted. PCB layout and firmware signal routing must be verified per Figure 3 in the datasheet before substitution.
SI88420EC-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
SI88420EC-ASR FAQ
1.How can I place an order for SI88420EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88420EC-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 SI88420EC-ASR reliable?
The price and inventory of SI88420EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88420EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88420EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88420EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88420EC-ASR?
SI88420EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88420EC-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 SI88420EC-ASR?
For technical support, including SI88420EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88420EC-ASR requirements.
6.How does Aetrix verify that SI88420EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88420EC-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 SI88420EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88420EC-ASR?
All SI88420EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88420EC-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 SI88420EC-ASR part is unused and in its original packaging.
Return procedure for SI88420EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88420EC-ASR Tags
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