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Skyworks Solutions Inc. SI88243BC-ISR
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- Part No.:
- SI88243BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88243BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
SI88243BC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W output power at 5 V on the secondary side, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS. It operates across –40 to +125 °C and is AEC-Q100 qualified for automotive traction inverters and battery management systems.
For engineers reviewing the SI88243BC-ISR datasheet, SI88243BC-ISR pinout, SI88243BC-ISR application, or SI88243BC-ISR equivalent, this device serves as a single-chip solution for isolated signal + power in high-noise industrial motor control, EV battery monitoring, PLC I/O modules, and medical patient-isolated data acquisition-where compact size, low EMI, and regulatory compliance (UL, VDE, CQC) are critical.
Technical Context
The SI88243BC-ISR implements four unidirectional CMOS isolation channels using RF-based on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and zero-startup initialization. Its integrated flyback DC-DC controller senses output voltage on the isolated side via VSNS and transmits error feedback across the barrier without optocouplers.
This variant uses internal power switches (VSW), supports 3.3/5.0 V input-to-output conversion, includes shutdown (SH pin), soft-start (SS pin), and fixed 250 kHz switching frequency. It requires only an external transformer, rectifier diode, and minimal passive components-no external FET or current-sense resistor.
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 high-speed SPI, CAN FD, or digital encoder interfaces |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in real-time control loops |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power secondary-side MCU, ADC, or gate drivers |
| Operating Temp | –40 to +125 °C - validated for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising noise in motor drive and inverter environments |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - meets automotive reliability and stress-test requirements |
Pinout & Package
SI88243BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance ≥8.3 mm, optimized for reinforced isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR (A1–A4, B1–B4) | Four unidirectional isolated data channels: A-side inputs (XMTR), B-side outputs (RCVR) |
| 7, 8 | GNDP / VSW | Primary-side ground and internal switch output - connects to transformer primary winding |
| 11, 12 | VDDP / VDDA | Primary-side power stage supply (VDDP) and signal domain supply (VDDA), both accept 3.3/5.0 V |
| 13, 14 | GNDA / SH | Primary-side signal ground and active-high shutdown control for DC-DC converter |
| 15, 16 | A3, A4 | Additional primary-side input channels - fully functional with same timing specs as A1/A2 |
| 17, 18 | B3, B4 | Additional secondary-side output channels - isolated, 100 Mbps capable, matched delay |
| 19, 20 | GNDB / VDDB | Secondary-side ground and regulated output supply - powered by internal DC-DC converter |
| VSNS, COMP, DNC/VREGB | Feedback / Compensation / Reference | VSNS senses isolated output voltage; COMP sets loop stability; VREGB is Zener-referenced (NC if VOUT ≤5.5 V) |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization and provides superior magnetic field immunity vs. pulse-based schemes |
| Secondary-side voltage sensing | Enables precise line/load regulation without optocouplers or bias circuitry on primary side |
| Integrated soft-start (SS pin) | Reduces inrush current during power-up - prevents transformer saturation and system brownouts |
| Reinforced insulation certification | UL, VDE, CSA, and CQC approvals confirm suitability for safety-critical medical and automotive applications |
| Low EMI dithering control | Minimizes conducted/radiated emissions in noise-sensitive environments like EV powertrains |
Applications
| Motor Control Systems | Battery Management Systems (BMS) |
|---|---|
Use Scenario: Isolating gate driver signals and current/voltage feedback in 3-phase inverter stacks for HVAC compressors or industrial servo drives. IC Role / Device Role / Timing Role: Provides galvanically isolated PWM inputs to IGBT/SiC drivers and returns analog sensor data across barrier with <23 ns skew. Use Value: Enables compact, single-package isolation + local 5 V supply - eliminates external DC-DC and reduces PCB area by >30%. |
Use Scenario: Monitoring cell voltages and temperatures in high-voltage EV battery packs (400–800 V bus). IC Role / Device Role / Timing Role: Isolates microcontroller SPI interface to analog front-end ICs while powering them via integrated 5 V output. Use Value: Meets IEC 61508 SIL-2 requirements via 5000 VRMS rating and AEC-Q100 qualification - reduces system-level safety validation effort. |
| Programmable Logic Controllers | Medical Patient Monitoring |
Use Scenario: Digital I/O isolation in modular PLC backplanes handling 24 V DC field signals and Ethernet-connected controllers. IC Role / Device Role / Timing Role: Transfers discrete status/control bits between field-side and logic-side domains with fail-safe default states. Use Value: SOIC-20 footprint supports high-density I/O modules; 100 kV/µs transient immunity prevents spurious trips in factory-floor EMI. |
Use Scenario: Isolating ECG/EEG analog front-ends from USB/Bluetooth host processors in portable diagnostic devices. IC Role / Device Role / Timing Role: Delivers reinforced isolation between patient-connected circuits and mains-powered processing units per IEC 60601-1. Use Value: Eliminates need for separate isolated power supply - simplifies design, reduces BOM cost, and accelerates FDA 510(k) submission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6423AARWZ | 4-channel, 50 Mbps max, 3.75 kVRMS isolation, 0.5 W output power, no soft-start or shutdown pin | Limited to lower-power secondary-side loads; lacks automotive qualification and programmable features | Choose when cost sensitivity outweighs power/EMI requirements and AEC-Q100 is not required |
| ISO7844FDWW | 4-channel, 100 Mbps, 8000 VRMS, no integrated DC-DC - requires external isolated power supply | Requires additional transformer, regulator, and compensation components - increases layout complexity and bill-of-materials | Choose when highest isolation voltage is mandatory and board space allows external power circuitry |
Compared with ADUM6423AARWZ and ISO7844FDWW, the SI88243BC-ISR uniquely combines AEC-Q100 qualification, 2 W integrated power, soft-start/shutdown control, and 5000 VRMS reinforced isolation in a single SOIC-20 package - reducing system component count and accelerating time-to-certification for automotive and industrial safety-critical designs.
Availability
SI88243BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV battery management systems, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SI88243BC-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 wireless, automotive, and industrial markets.
The Si88x4x family was designed to replace optocoupler-based isolation + discrete DC-DC combinations in high-reliability applications demanding compact size, low EMI, and regulatory compliance - especially where space-constrained automotive and medical systems require certified, integrated power and signal isolation.
FAQ
What is the maximum continuous output power of the SI88243BC-ISR's integrated DC-DC converter?
The SI88243BC-ISR delivers up to 2 W of continuous isolated output power at 5 V on the secondary side (VDDB). This is sufficient to power a typical ARM Cortex-M microcontroller, precision ADC, and associated signal conditioning circuitry without requiring an external isolated power supply. Peak power capability exceeds 5 W for short durations, but thermal limits constrain sustained operation to 2 W under full-load conditions at +125 °C ambient.
Does the SI88243BC-ISR support bidirectional data transmission on its isolation channels?
No, the SI88243BC-ISR provides four unidirectional isolation channels: A1–A4 are inputs (transmit side), and B1–B4 are outputs (receive side). Each channel operates independently with RF-based on/off keying modulation. Bidirectional communication must be implemented using two dedicated channels (e.g., A1→B1 for TX, A2→B2 for RX) - the device does not support automatic direction control or half-duplex arbitration logic internally.
Can the SI88243BC-ISR be used with a 24 V input supply?
No - the SI88243BC-ISR is specifically configured for low-voltage operation: it accepts 3.3 V or 5.0 V on VDDP and VDDA. For 24 V input applications, Skyworks offers the Si88443BC-ISR or Si88643BC-ISR variants, which use external power switches (ESW/RSN pins) and support high-voltage flyback topologies. Using SI88243BC-ISR with 24 V would exceed absolute maximum ratings and cause permanent damage.
What is the function of the DNC/VREGB pin on the SI88243BC-ISR?
On the SI88243BC-ISR, the DNC/VREGB pin is a Zener-referenced voltage output intended only for applications where the isolated DC-DC output exceeds 5.5 V. Since SI88243BC-ISR is rated for 3.3/5.0 V output, this pin must be left unconnected (DNC - Do Not Connect) and floated. Connecting it in a 5 V configuration may disrupt regulation accuracy or cause instability due to unintended reference loading.
How does the SI88243BC-ISR achieve its 100 kV/µs transient immunity?
The SI88243BC-ISR achieves 100 kV/µs typical common-mode transient immunity through its capacitive silicon dioxide isolation barrier combined with differential RF modulation and on-chip filtering. The high dielectric strength of the 20 µm SiO₂ layer, coupled with balanced transmitter/receiver layout and internal slew-rate limiting, rejects fast-edge noise without requiring external TVS or RC snubbers - a key advantage over optocouplers and transformer-based isolators in inverter gate-drive applications.
SI88243BC-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:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 1/3
- 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
SI88243BC-ISR FAQ
1.How can I place an order for SI88243BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88243BC-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 SI88243BC-ISR reliable?
The price and inventory of SI88243BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88243BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88243BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88243BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88243BC-ISR?
SI88243BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88243BC-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 SI88243BC-ISR?
For technical support, including SI88243BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88243BC-ISR requirements.
6.How does Aetrix verify that SI88243BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88243BC-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 SI88243BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88243BC-ISR?
All SI88243BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88243BC-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 SI88243BC-ISR part is unused and in its original packaging.
Return procedure for SI88243BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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