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Skyworks Solutions Inc. SI88243BC-ASR
- Part No.:
- SI88243BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88243BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,519
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Product details
Overview
SI88243BC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS for one minute. It serves as a complete signal + power isolation solution in industrial motor control and battery management systems.
For engineers reviewing the SI88243BC-ASR datasheet, SI88243BC-ASR pinout, SI88243BC-ASR application, or SI88243BC-ASR equivalent, this page delivers verified specifications, SOIC-20 wide-body package mapping, functional pin roles, automotive-grade AEC-Q100 qualification, and two confirmed alternative parts for system-level design trade-offs.
Technical Context
The SI88243BC-ASR implements four unidirectional RF-based digital isolation channels using capacitive silicon dioxide barriers, with on/off keying modulation for high noise immunity and zero initialization requirement. Its integrated flyback DC-DC controller operates in peak current mode, senses output voltage on the secondary side via VSNS, and transmits error signals across the barrier without optocouplers.
This variant belongs to the Si882xx family and uses internal power switches (VSW), fixed 250 kHz switching frequency, shutdown via SH pin (Pin 6), soft-start via SS pin (Pin 7), and supports low-voltage configurations (3–5.5 V input to 3/5 V output). It does not support programmable frequency or external FET drive (ESW/RSN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS (UL 1577) - enables reinforced insulation in safety-critical industrial and automotive systems. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces including SPI, RS-485, and CAN FD physical layer signaling. |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in real-time control loops such as motor phase commutation. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side MCU, gate drivers, or sensors without external regulators. |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| AEC-Q100 Grade | Qualified - meets stress test requirements for automotive electronics, including HTOL and TC024. |
| Transient Immunity | 100 kV/µs typical - withstands fast EFT/burst events in noisy motor drive and inverter applications. |
Pinout & Package
SI88243BC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (7.5 mm body width, creepage ≥8.3 mm), optimized for reinforced insulation and high-voltage spacing.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDP, GNDP, SH, SS, VSW, HF XMTR | Primary-side DC-DC power, shutdown control, soft-start timing, internal switch output, and channel 1–2 transmit inputs. |
| 9, 10, 11, 12, 15, 16 | VDDA, GNDA, A1–A4 | Primary-side signal supply, ground, and four digital input channels feeding RF transmitters. |
| 17, 18, 19, 20 | B1–B4, GNDB, VDDB | Secondary-side isolated outputs, ground, and supply - powered directly by integrated DC-DC converter. |
| 13, 14 | VSNS, COMP | Secondary-side feedback sensing node and compensation network connection for stable DC-DC regulation. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup initialization and provides superior magnetic field immunity vs. transformer- or capacitor-based alternatives. |
| Secondary-side voltage sensing | Enables precise line/load regulation without optocouplers or auxiliary bias windings - reduces BOM count by ≥3 components. |
| Integrated soft-start (SS pin) | Controls inrush current during power-up, preventing voltage droop on shared VDDA rails in multi-isolator systems. |
| Reinforced insulation certification | UL, CSA, VDE, and CQC approvals confirm suitability for functional safety architectures up to SIL-3 / ASIL-C. |
| AEC-Q100 qualified | Validated for automotive use with PPAP documentation support and IMDS/CAMDS compliance. |
Applications
| Industrial Motor Control | Battery Management Systems |
|---|---|
Use Scenario: Isolating gate driver signals and ADC feedback in 3-phase inverter stacks for EV traction motors. IC Role / Device Role / Timing Role: Provides synchronized, low-latency isolation of PWM and current-sense signals while powering isolated gate drivers from its DC-DC output. Use Value: Enables single-chip signal + power isolation, reducing layout area and eliminating external LDOs or isolated DC-DC modules. |
Use Scenario: Monitoring cell voltages and temperatures across high-voltage battery packs (up to 800 V) in hybrid electric vehicles. IC Role / Device Role / Timing Role: Isolates analog front-end data acquisition and microcontroller communication while supplying regulated 3.3 V to isolated ADCs and temperature sensors. Use Value: Meets IEC 61508 functional safety requirements via certified 5000 VRMS isolation and AEC-Q100 qualification. |
| Programmable Logic Controllers | Isolated Switch-Mode Supplies |
Use Scenario: Signal isolation between CPU backplane and field I/O modules in distributed control cabinets exposed to 2 kV surge transients. IC Role / Device Role / Timing Role: Transfers digital I/O status and command signals across isolation barrier while powering isolated I/O ASICs via VDDB. Use Value: Replaces discrete optocoupler + isolated DC-DC combinations, cutting bill-of-materials cost by 35% and improving long-term reliability. |
Use Scenario: Providing isolated auxiliary power and feedback isolation in 1 kW telecom rectifiers with 48 V input and 12 V/5 V outputs. IC Role / Device Role / Timing Role: Delivers isolated 5 V at 400 mA while simultaneously isolating voltage-mode feedback signals to primary-side PWM controller. Use Value: Achieves <±1% load regulation without optocoupler aging drift, extending mean time between failures by >5× vs. legacy solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88242BC-ASR | Same SOIC-20 package and pinout; differs only in failsafe output state (high vs. low) on power loss. | Suitable where default-high isolated outputs are required during brownout or reset conditions. | Select SI88242BC-ASR when system logic requires active-high default behavior on channel outputs during fault states. |
| ADUM6423AARIZ-RL | Analog Devices part with 4-channel isolation + 500 mW DC-DC; lower output power, no AEC-Q100 qualification. | Limited to non-automotive industrial use due to lack of automotive qualification and reduced power capability. | Choose ADUM6423AARIZ-RL only for cost-sensitive, non-automotive designs where ≤500 mW isolated power suffices. |
Compared with SI88243BC-ASR, SI88242BC-ASR offers identical performance and packaging but inverted failsafe behavior, while ADUM6423AARIZ-RL trades 4× less isolated power and no automotive qualification for broader distributor availability and lower unit cost in non-safety-critical applications.
Availability
SI88243BC-ASR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and programmable logic controllers requiring stable component supply, long lifecycle support, and automotive-grade reliability.
Supply support for SI88243BC-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 high-reliability applications.
The Si88xx family was designed to replace optocoupler-based isolation with integrated digital isolation + DC-DC, targeting automotive traction inverters, industrial PLCs, and medical equipment demanding certified reinforced insulation and extended temperature operation.
FAQ
What is the maximum continuous output power of the SI88243BC-ASR's integrated DC-DC converter?
The SI88243BC-ASR delivers up to 2 W average output power at 5.0 V under continuous operation, as specified in the Skyworks datasheet for low-voltage configurations (3–5.5 V input). Peak power capability reaches 5 W transiently, but sustained loading must remain within the 2 W thermal limit to maintain reliability and regulation accuracy across –40 °C to +125 °C.
Does the SI88243BC-ASR support programmable switching frequency?
No, the SI88243BC-ASR uses a fixed 250 kHz switching frequency for its internal DC-DC controller. Programmable frequency is only available on Si883xx and Si886xx variants via the SH_FC and SS pins. For SI88243BC-ASR, frequency adjustment is not supported - design must accommodate the fixed 250 kHz fundamental and its harmonics in EMI filtering.
Can the SI88243BC-ASR be used in high-voltage input applications such as 24 V to 5 V conversion?
No - the SI88243BC-ASR is designed exclusively for low-voltage input (3–5.5 V) to 3.3/5.0 V output. High-voltage input configurations (e.g., 24 V) require Si884xx or Si886xx variants with external FET drive (ESW/RSN pins) and different compensation networks. Using SI88243BC-ASR with >5.5 V on VDDP risks permanent damage.
What is the function of Pin 14 (COMP) on the SI88243BC-ASR?
Pin 14 (COMP) is the compensation node for the internal DC-DC controller's error amplifier. It requires an external RC network (RCOMP = 49.9 kΩ, CCOMP calculated per AN892) connected to GNDB to stabilize the feedback loop. Omitting or misconfiguring this network causes regulation instability, output ripple, or failure to start - it is mandatory for functional DC-DC operation of the SI88243BC-ASR.
Is the SI88243BC-ASR pin-compatible with other Si882xx variants like SI88240 or SI88241?
Yes - all Si882xx variants (including SI88240, SI88241, SI88242, SI88243, SI88244) share identical SOIC-20 pinout, package dimensions, and DC-DC interface. Differences are limited to channel directionality (XMTR/RCVR assignment), failsafe state, and optional features - enabling drop-in replacement in most PCB layouts without redesign.
SI88243BC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- Package/Case:
- 20-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:
- 4
- Inputs - Side 1/Side 2:
- 1/3
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- 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:
- 20-SOIC
SI88243BC-ASR FAQ
1.How can I place an order for SI88243BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88243BC-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 SI88243BC-ASR reliable?
The price and inventory of SI88243BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88243BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88243BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88243BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88243BC-ASR?
SI88243BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88243BC-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 SI88243BC-ASR?
For technical support, including SI88243BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88243BC-ASR requirements.
6.How does Aetrix verify that SI88243BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88243BC-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 SI88243BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88243BC-ASR?
All SI88243BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88243BC-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 SI88243BC-ASR part is unused and in its original packaging.
Return procedure for SI88243BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88243BC-ASR Tags
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SI8710AC-B-ISR
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