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Skyworks Solutions Inc. SI88420BC-ISR
- Part No.:
- SI88420BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88420BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
SI88420BC-ISR 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 isolation rating. It serves as a complete signal + power isolation solution in industrial motor drives and EV battery management systems.
For engineers reviewing the SI88420BC-ISR datasheet, SI88420BC-ISR pinout, SI88420BC-ISR application, or SI88420BC-ISR equivalent, key selection criteria include its external-FET-driven flyback topology, absence of shutdown/soft-start pins (SH/SS), SOIC-20 wide-body RoHS package, and AEC-Q100 qualification for automotive-grade designs requiring robust transient immunity (100 kV/µs typical) and operation from –40 to +125 °C.
Technical Context
The SI88420BC-ISR implements two unidirectional CMOS digital isolation channels using RF on/off keying across a silicon dioxide capacitive barrier, enabling noise-immune data transmission without startup initialization. Its isolated DC-DC converter uses peak current mode control with secondary-side voltage sensing via VSNS and internal error encoding across the barrier.
This variant belongs to the Si884xx family optimized for high-voltage primary-side operation (≥5.5 V), requiring external NMOS switch (driven by ESW), current sense resistor (connected to RSN), and Type 1 loop compensation (RCOMP = 100 kΩ, CCOMP calculated per crossover frequency). It lacks SH and SS pins-shutdown and soft-start functions are not implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time feedback loops. |
| Propagation Delay | 23 ns max - enables precise timing-critical applications such as gate driver signaling and ADC sampling synchronization. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated microcontrollers, sensors, or analog front-ends without external regulators. |
| Transient Immunity | 100 kV/µs typical - ensures reliable operation in noisy environments like motor inverters and industrial PLCs. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient conditions. |
| AEC-Q100 Grade | Qualified - supports automotive functional safety requirements including PPAP documentation and IMDS/CAMDS compliance. |
Pinout & Package
SI88420BC-ISR 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, rated for 5000 VRMS isolation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | Primary-side DC-DC interface | GNDP (power ground), RSN (current sense), ESW (external switch driver), VDDA (signal supply), GNDA (signal ground), VREGA (voltage reference for external regulator). |
| 7, 8, 9, 10 | Digital isolator inputs/outputs | A1, A2 (primary-side channel inputs); B1, B2 (secondary-side channel outputs). |
| 11, 12, 13, 14, 15, 16 | Secondary-side DC-DC interface | GNDB (signal ground), VDDB (isolated signal supply), VSNS (feedback sense), COMP (compensation node), NC (no connect), DNC/VREGB (Zener reference for >5.5 V outputs). |
| 17, 18, 19, 20 | Isolation barrier & unused | HF XMTR/RCVR (internal RF circuitry), no external connection; pins 17–20 are internal high-frequency nodes not brought out. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Eliminates magnetic field susceptibility and startup initialization; achieves 18 ns typical propagation delay and 100 Mbps data rate. |
| Secondary-side regulated feedback | VSNS-sensed closed-loop control enables superior line/load regulation without optocouplers or bias circuitry. |
| External-FET flyback topology | ESW and RSN pins support high-input-voltage operation (up to 24 V) with scalable power delivery and thermal resilience. |
| Integrated safety protections | Includes UVLO on both sides, cycle-skipping at light loads, and thermal shutdown to prevent permanent damage. |
| AEC-Q100 automotive qualification | Validated for automotive use with AIAG-compliant PPAP support, IMDS/CAMDS listing, and manufacturing process controls. |
Applications
| Motor Control Inverters | Battery Management Systems (BMS) |
|---|---|
Use Scenario: Isolating gate driver signals and current/voltage sensing feedback in 3-phase IGBT/SiC inverter stages operating at 400–800 V bus voltages. IC Role / Device Role / Timing Role: SI88420BC-ISR provides bidirectional signal isolation (A1/A2 → B1/B2) and powers isolated gate driver ICs via its 5 V/2 W regulated output. Use Value: Enables compact, single-chip isolation + power architecture with 100 kV/µs common-mode transient immunity, reducing component count vs. discrete isolator + DC-DC solutions. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs while maintaining galvanic separation between high-voltage stack and low-voltage MCU domain. IC Role / Device Role / Timing Role: SI88420BC-ISR isolates analog front-end SPI communication and supplies isolated 3.3 V power to local ADCs and temperature sensors on each module. Use Value: Delivers certified 5000 VRMS isolation and AEC-Q100 reliability in extended temperature range, eliminating need for separate isolated power rails. |
| Industrial PLC Analog I/O Modules | Renewable Energy Solar Inverters |
Use Scenario: Providing channel-isolated 4–20 mA current loop inputs and isolated 0–10 V analog outputs in modular PLC backplanes exposed to factory EMI. IC Role / Device Role / Timing Role: SI88420BC-ISR isolates sensor signal paths and powers isolated op-amp buffers and DACs on the field side. Use Value: Achieves 23 ns max propagation delay and ultra-low emissions for EMC-compliant designs without added filtering components. |
Use Scenario: Isolating MPPT controller communication and powering auxiliary circuits (e.g., relay drivers, fan controllers) in grid-tied solar inverters with 1000 V DC input. IC Role / Device Role / Timing Role: SI88420BC-ISR delivers isolated 5 V power and isolates UART/RS-485 control signals between DC-side controller and AC-side inverter stage. Use Value: Supports high-voltage primary-side operation (24 V input config) and meets reinforced insulation standards required for PV system safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88421BC-ISR | Single forward + single reverse isolation channel; same SOIC-20 package and DC-DC architecture. | Used where asymmetric signal flow (e.g., control + feedback) is required instead of dual forward. | Select when channel directionality-not count-is the critical constraint; pinout differs (A1/A2/B1/B2 assignment changes). |
| ADUM6420AARIZ-RL | Analog Devices part with 4-channel isolation, integrated DC-DC, but only 500 VRMS isolation and no AEC-Q100 qualification. | Suitable for non-automotive industrial applications where lower isolation voltage suffices and higher channel count is needed. | Choose for cost-sensitive, non-safety-critical designs needing four channels; not drop-in due to different pinout, package (SOIC-20 vs. SOIC-24), and regulatory profile. |
Compared with SI88420BC-ISR, SI88421BC-ISR offers directional flexibility at identical isolation and thermal specs, while ADUM6420AARIZ-RL trades isolation robustness and automotive qualification for higher channel density-making SI88420BC-ISR optimal for high-reliability, high-voltage, automotive-qualified dual-channel isolation + power.
Availability
SI88420BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and renewable energy inverters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88420BC-ISR 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 high-performance wireless and wired infrastructure.
The Si88xx family was engineered to replace optocoupler-based isolation + discrete DC-DC designs in demanding applications-delivering integrated, certified, and thermally resilient signal + power isolation for automotive, industrial, and energy systems.
FAQ
What is the maximum data rate supported by the SI88420BC-ISR?
The SI88420BC-ISR supports a maximum data rate of 100 Mbps across both isolation channels. This is confirmed in the Skyworks datasheet Section 1 and Table 1, and enables high-speed protocols such as SPI clocked at 50 MHz or fast UART links. The SI88420BC-ISR maintains this rate with guaranteed timing margins over its full operating temperature range.
Does the SI88420BC-ISR include shutdown or soft-start functionality?
No, the SI88420BC-ISR does not implement shutdown (SH) or soft-start (SS) features. As stated in Section 2.3.1 of the datasheet, these pins are absent on Si884xx devices. The SI88420BC-ISR relies on external enable sequencing and inherent cycle-skipping for light-load efficiency-making it suitable for always-on or externally controlled power domains.
What transformer is recommended for use with the SI88420BC-ISR in a 24 V to 5 V isolated power design?
The UMEC UTB02250s and Coilcraft TA7788-AL transformers are validated for 24 V input to 5 V output with the SI88420BC-ISR, per Table 2 in the datasheet. Both provide 5 kVRMS isolation, appropriate turns ratio (3.0:1.0 or 1.00:1.25:0.75), and meet leakage inductance and primary resistance specifications required for stable regulation and EMI control.
How is the isolated output voltage set on the SI88420BC-ISR?
The isolated output voltage is set using an external resistor divider (R1/R2) connected to the VSNS pin. As defined in Section 2.3.6, VOUT = VSNS × (1 + R1/R2) + IOFFSET × R1. The internal reference at VSNS is 0.8 V, so a standard 5 V output requires R1/R2 ≈ 5.25. This secondary-side sensing eliminates optocouplers and improves load regulation accuracy versus primary-side schemes.
What is the purpose of the RSN and ESW pins on the SI88420BC-ISR?
The RSN (current sense) and ESW (external switch driver) pins enable the SI88420BC-ISR's high-voltage flyback operation. ESW drives the gate of an external NMOS transistor (Q1), while RSN monitors the source current through a shunt resistor to provide peak-current-mode control. This architecture allows safe, efficient conversion from inputs up to 24 V-unlike Si882xx/3xx variants that use internal switches limited to ≤5.5 V.
SI88420BC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI88420BC-ISR FAQ
1.How can I place an order for SI88420BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88420BC-ISR 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-ISR reliable?
The price and inventory of SI88420BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88420BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88420BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88420BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88420BC-ISR?
SI88420BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88420BC-ISR 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-ISR?
For technical support, including SI88420BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88420BC-ISR requirements.
6.How does Aetrix verify that SI88420BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88420BC-ISR 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-ISR meets industry standards.
7.What is the process for return or replacement of SI88420BC-ISR?
All SI88420BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88420BC-ISR, 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-ISR part is unused and in its original packaging.
Return procedure for SI88420BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88420BC-ISR Tags
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SI8710AC-B-ISR
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