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Skyworks Solutions Inc. SI88442BD-ISR
- Part No.:
- SI88442BD-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88442BD-ISR.pdf
- Description:
- IC DGTL ISO 5KV 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
SI88442BD-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage input (up to 24 V) to isolated 3.3/5.0 V or 24 V output configurations. It delivers up to 5 W peak isolated power, supports data rates up to 100 Mbps, achieves 23 ns max propagation delay, and provides 5000 VRMS reinforced isolation. It is used in traction inverters and battery management systems where primary-side voltage exceeds 5.5 V.
For engineers reviewing the SI88442BD-ISR datasheet, SI88442BD-ISR pinout, SI88442BD-ISR application, or SI88442BD-ISR equivalent, this page details its SOIC-20 wide-body package, external switch-driven flyback topology, RSN/ESW-based current sensing and driver interface, and AEC-Q100 qualification for automotive-grade reliability under –40 to +125 °C operation.
Technical Context
The SI88442BD-ISR implements four unidirectional RF-based digital isolation channels across a silicon dioxide capacitive barrier, using on/off keying modulation for superior noise immunity and magnetic field rejection. Its isolated DC-DC converter uses peak current mode control with secondary-side voltage sensing via VSNS and closed-loop feedback transmitted 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 and current sensing via RSN. It lacks SH/SH_FC shutdown and SS soft-start pins-features reserved for Si882xx/3xx/6xx-confirming fixed-frequency (250 kHz default) and no user-programmable startup timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute (UL 1577 reinforced insulation) |
| Data Rate | Up to 100 Mbps - enables real-time control loop signaling in motor drives |
| Propagation Delay | 23 ns max - ensures tight timing alignment across isolation barrier |
| DC-DC Output Power | Up to 5 W peak - powers isolated logic and external circuitry without auxiliary supply |
| Operating Temp | –40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching EMI events |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - validated for automotive electronics reliability |
Pinout & Package
SI88442BD-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.0 mm height) with creepage/clearance ≥8.3 mm, rated for 5000 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR | Four bidirectional-capable channel pairs (A1–A4, B1–B4); each pair supports independent directionality |
| 7, 8 | A1, A2 | Primary-side digital input/output signals (VDDA domain) |
| 11, 12 | A3, A4 | Primary-side digital input/output signals (VDDA domain) |
| 13, 14 | B1, B2 | Secondary-side digital input/output signals (VDDB domain) |
| 15, 16 | B3, B4 | Secondary-side digital input/output signals (VDDB domain) |
| 17 | GNDP | Primary-side power stage ground - must be short-traced to VDDP |
| 18 | RSN | Primary-side current sense input for external FET overcurrent protection |
| 19 | ESW | External switch gate driver output - controls NMOS Q1 in high-voltage flyback topology |
| 20 | VDDA | Primary-side signal power supply (≤5.5 V required) |
| GNDA (Pin 12 not listed separately - shared with A2) | Primary-side signal ground | Must be directly connected to ground plane; separate from GNDP |
| GNDB (Pin 14 not listed separately - shared with B1) | Secondary-side signal ground | Reference for VDDB and B-channel I/O; galvanically isolated from GNDA |
| VDDB (Pin 15 not listed separately - shared with B3) | Secondary-side signal power supply | Supplied by isolated DC-DC output; powers B-side logic and peripherals |
| VREGA (Pin 11 not listed separately - shared with A3) | Voltage reference for external regulator | Used with external NPN transistor to generate VDDA when primary supply >5.5 V |
| DNC/VREGB (Pin 10) | Do Not Connect or Zener reference | Connect only if VDDB >5.5 V; otherwise leave floating or NC |
| VSNS (Pin 9) | Secondary-side feedback input | Resistor-divider sensed output voltage - sets regulated VDDB level |
| COMP (Pin 6) | Compensation node | RC network (RCOMP = 100 kΩ + CCOMP) stabilizes flyback control loop |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | On/off keying modulation enables 100 kV/µs transient immunity and immunity to magnetic fields |
| Integrated flyback DC-DC controller | Supports 24 V primary input with external NMOS switch (ESW/RSN interface) and secondary-side regulation |
| Secondary-side voltage sensing | VSNS feedback eliminates optocoupler dependency - improves line/load regulation and long-term reliability |
| Thermal shutdown protection | Automatically disables converter at unsafe junction temperature - prevents permanent damage |
| Cycle skipping at light load | Reduces switching losses and improves efficiency below ~20% load - inherent to Si884xx external-switch architecture |
| AEC-Q100 qualified | Validated for automotive applications including traction inverters and BMS with full PPAP support |
Applications
| Motor Control Inverter | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating gate drive signals and current/voltage feedback between MCU and IGBT/SiC half-bridge in EV traction inverters. IC Role / Device Role / Timing Role: SI88442BD-ISR provides four isolated data paths plus 5 W isolated power to drive gate drivers and ADC references on the high-side domain. Use Value: Enables single-chip isolation + power for compact inverter designs while meeting 5000 VRMS safety requirements and AEC-Q100 reliability. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs with isolated communication to master controller. IC Role / Device Role / Timing Role: SI88442BD-ISR isolates SPI/UART signals from analog front-end ICs and supplies isolated 3.3 V to local microcontrollers and sensors. Use Value: Eliminates need for separate isolated DC-DC module - reduces BOM count, PCB area, and failure points in high-reliability BMS stacks. |
| Industrial PLC Analog I/O Module | Isolated Switch-Mode Power Supply (SMPS) |
|
Use Scenario: Providing channel-isolated analog input conditioning (voltage/current) in modular PLC backplanes with 24 V field-side supply. IC Role / Device Role / Timing Role: SI88442BD-ISR delivers isolated 5 V to ADCs and op-amps while transmitting digitized data across barrier at ≤100 Mbps. Use Value: Supports 24 V primary input directly - avoids pre-regulation stage and simplifies power tree in DIN-rail mounted modules. |
Use Scenario: Generating isolated bias rails for gate drivers and controllers in 1–3 kW telecom/server SMPS with primary-side 48–54 V input. IC Role / Device Role / Timing Role: SI88442BD-ISR acts as isolated auxiliary supply generator, powering secondary-side PWM controllers and sensing circuits. Use Value: Achieves 5 W peak output with <100 ns propagation delay - enables precise timing-critical feedback loops in digitally controlled SMPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88440BD-ISR | No internal VREGA; requires external linear regulator for VDDA if primary supply >5.5 V | Lacks integrated voltage reference for VDDA generation - increases external component count | Select when primary-side supply is ≤5.5 V and cost sensitivity outweighs design simplicity |
| SI88642BD-ISR | Includes SH_FC and SS pins for programmable shutdown and soft-start; 200–800 kHz frequency tuning | Supports dynamic EMI reduction and inrush current control - critical in noise-sensitive medical equipment | Select when variable frequency or controlled startup is required; accepts larger footprint (SOIC-24) |
Compared with SI88442BD-ISR, SI88440BD-ISR reduces integration for lower cost but adds external regulation complexity, while SI88642BD-ISR trades fixed-frequency simplicity for programmable control features and larger package - making SI88442BD-ISR optimal for cost-constrained, high-volume automotive power systems needing proven 250 kHz stability.
Availability
SI88442BD-ISR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, and industrial PLC analog I/O modules requiring stable component supply, AEC-Q100 compliance, and 5000 VRMS isolation assurance.
Supply support for SI88442BD-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.
The Si88x4x product line was engineered to replace optocouplers and discrete isolated DC-DC stages in automotive and industrial systems, delivering integrated signal + power isolation in a single SOIC package.
FAQ
What is the maximum isolated output power supported by the SI88442BD-ISR?
The SI88442BD-ISR supports up to 5 W peak isolated output power when used with an appropriately rated external transformer and NMOS switch. This power level is sufficient to supply isolated gate drivers, ADC references, and microcontrollers in automotive traction inverters and industrial I/O modules. Average output power is typically 2 W at 5.0 V, depending on thermal design and transformer selection.
Does the SI88442BD-ISR support programmable switching frequency?
No, the SI88442BD-ISR operates at a fixed default switching frequency of 250 kHz and does not include SH_FC or SS pins for frequency tuning. Unlike Si883xx/6xx variants, it is optimized for deterministic EMI performance in automotive applications where frequency dithering is unnecessary. Frequency adjustment requires selecting SI88642BD-ISR instead.
Can the SI88442BD-ISR be used with a 24 V primary-side input?
Yes, the SI88442BD-ISR is specifically designed for high-voltage primary-side operation up to 24 V. It uses the ESW pin to drive an external NMOS switch and the RSN pin for current sensing - enabling safe, efficient flyback conversion without internal high-voltage switches. Primary-side VDDA must still be ≤5.5 V, supplied via VREGA or external LDO.
What isolation certifications does the SI88442BD-ISR hold?
The SI88442BD-ISR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1, and CQC GB4943.1. It also meets AEC-Q100 Grade 0 for automotive use. These approvals validate its suitability for functional safety applications in EV powertrains and industrial safety systems requiring reinforced insulation barriers.
How many digital channels does the SI88442BD-ISR provide, and what is their directionality?
The SI88442BD-ISR provides four unidirectional digital isolation channels (A1–A4 and B1–B4), configurable as two independent bidirectional links or four independent unidirectional paths. Each channel uses RF on/off keying across a silicon dioxide barrier, achieving 100 Mbps data rate and 23 ns max propagation delay - ideal for time-critical motor control and sensor feedback.
SI88442BD-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88442BD-ISR FAQ
1.How can I place an order for SI88442BD-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88442BD-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 SI88442BD-ISR reliable?
The price and inventory of SI88442BD-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88442BD-ISR is usually 5 days.
3.What payment methods are accepted for SI88442BD-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88442BD-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88442BD-ISR?
SI88442BD-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88442BD-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 SI88442BD-ISR?
For technical support, including SI88442BD-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88442BD-ISR requirements.
6.How does Aetrix verify that SI88442BD-ISR is sourced from the original manufacturer or authorized distributors?
All SI88442BD-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 SI88442BD-ISR meets industry standards.
7.What is the process for return or replacement of SI88442BD-ISR?
All SI88442BD-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88442BD-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 SI88442BD-ISR part is unused and in its original packaging.
Return procedure for SI88442BD-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88442BD-ISR Tags
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