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Skyworks Solutions Inc. SI88241BC-ISR
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- Part No.:
- SI88241BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88241BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
SI88241BC-ISR 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. It serves as a signal and power isolation solution in industrial motor control and battery management systems.
For engineers reviewing the SI88241BC-ISR datasheet, SI88241BC-ISR pinout, SI88241BC-ISR application, or SI88241BC-ISR equivalent, this page provides verified technical context, package mapping, functional pin definitions, real-world use cases, and validated alternative options for isolated power + signal transfer in high-noise environments.
Technical Context
The SI88241BC-ISR integrates four unidirectional CMOS digital 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 operates with internal primary-side switches (VSW), supports soft-start via external capacitor on SS pin, and features shutdown control via SH pin asserted high.
This variant uses a low-voltage configuration (3–5.5 V input) and senses output voltage on the secondary side via VSNS for precise regulation without optocouplers. It requires an external miniature transformer, Schottky rectifier, and minimal passive components - no external FET or current sense resistor needed, distinguishing it from Si884xx/Si886xx variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS (UL 1577, reinforced insulation per IEC 62368-1) |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication (e.g., SPI, RS-485 PHY interface) |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in real-time control loops |
| DC-DC Output Power | 2 W average at 3.3 V or 5.0 V - sufficient to power secondary-side MCU, ADC, or gate drivers |
| Operating Temp | –40 °C to +125 °C - qualified for automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs typical - withstands fast EFT/burst events in motor drive and PLC environments |
| Package | SOIC-20 wide-body (10.3 mm × 7.5 mm, creepage ≥8.3 mm) |
Pinout & Package
SI88241BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package with 8.3 mm creepage and reinforced insulation barrier. Pin numbering follows standard SOIC convention with isolation barrier separating primary (A-side) and secondary (B-side) domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1–A4 inputs | Primary-side digital input signals - drive isolation channel transmitters |
| 5, 6 | GNDP, VSW | Primary-side power ground and internal switch output - connects to transformer primary winding |
| 7, 8 | VDDP, VDDA | Primary-side power stage and signal supply - separate rails reduce noise coupling |
| 9, 10 | GNDA, SH | Primary-side signal ground and shutdown control - pull SH low for normal operation |
| 11–14 | B1–B4 outputs | Secondary-side isolated digital outputs - directly interface with isolated MCU peripherals |
| 15, 16 | GNDB, VDDB | Secondary-side ground and signal supply - powered by integrated DC-DC converter |
| 17, 18 | DNC/VREGB, NC | Do-not-connect (output >5.5 V only); NC - leave floating or grounded per layout guidelines |
| 19, 20 | VSNS, COMP | Secondary-side feedback sensing and loop compensation - sets output voltage and stability |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Eliminates startup initialization and provides superior magnetic field immunity vs. pulse-based schemes |
| Integrated DC-DC controller | Enables single-chip isolated power + signal transfer - reduces BOM count and board area vs. discrete isolator + DC-DC |
| Secondary-side voltage sensing | Delivers ±1.5% load regulation without optocouplers or secondary-side bias circuitry |
| Programmable soft-start | External capacitor on SS pin controls inrush current - prevents input rail droop during power-up |
| Reinforced safety certification | UL, CSA, VDE, and CQC approvals simplify system-level safety compliance for industrial and automotive end equipment |
Applications
| Industrial Motor Control | Battery Management Systems |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback from high-voltage inverter stages in servo drives and EV traction inverters. IC Role / Device Role / Timing Role: SI88241BC-ISR provides four isolated logic channels plus local 5 V supply for gate drivers and ADC reference, replacing discrete isolators and isolated DC-DC modules. Use Value: Enables compact, high-reliability isolation with <23 ns propagation delay for precise PWM timing and fault response under 100 kV/µs transients. |
Use Scenario: Isolating cell voltage monitoring, temperature sensing, and pack communication in lithium-ion battery packs. IC Role / Device Role / Timing Role: SI88241BC-ISR delivers isolated 3.3 V power and four bidirectional signal paths between MCU and analog front-end ICs across isolation barrier. Use Value: Supports AEC-Q100-compliant designs with –40 °C to +125 °C operation and 5000 VRMS working voltage for long-term pack reliability. |
| Programmable Logic Controllers | Isolated Switch-Mode Power Supplies |
|
Use Scenario: Signal isolation between field I/O modules and central controller in distributed control systems. IC Role / Device Role / Timing Role: SI88241BC-ISR isolates digital inputs (e.g., limit switches) and outputs (e.g., relay drivers), while powering isolated sensor interfaces. Use Value: Reduces component count and improves EMC performance with integrated 2 W DC-DC and 100 Mbps data rate for fast status updates. |
Use Scenario: Providing isolated auxiliary power and feedback signaling in AC-DC and DC-DC converters with secondary-side regulation. IC Role / Device Role / Timing Role: SI88241BC-ISR replaces optocoupler + LDO combinations by delivering regulated 5 V and isolated error amplifier feedback path. Use Value: Achieves ±1.5% load regulation and eliminates optocoupler aging drift, extending PSU lifetime in industrial power supplies. |
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 |
|---|---|---|---|
| SI88240BC-ISR | Same SOIC-20 package and DC-DC architecture, but with all four channels configured as transmitter-only (A→B only). | Lacks receiver capability on B-side - unsuitable for bidirectional protocols like I²C or half-duplex UART. | Select SI88240BC-ISR only when unidirectional signal flow suffices and cost optimization is critical. |
| ADUM6421ARWZ | Analog Devices part with 4-channel isolator + 500 mW isolated DC-DC; lower output power, no programmable soft-start or shutdown pin. | Insufficient for powering isolated gate drivers or multi-peripheral loads requiring >1 W. | Choose ADUM6421ARWZ where lower power and smaller footprint are acceptable, and safety certification scope differs. |
Compared with SI88241BC-ISR, SI88240BC-ISR offers identical isolation and power specs but lacks bidirectional flexibility, while ADUM6421ARWZ trades 4× higher DC-DC output power and programmable control for reduced integration density and narrower safety certification coverage.
Availability
SI88241BC-ISR 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 certified reinforced isolation.
Supply support for SI88241BC-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 SI88241BC-ISR belongs to Skyworks' Si88x4x family of quad digital isolators with integrated DC-DC converters, designed specifically for space-constrained industrial and automotive systems needing simultaneous signal integrity and local isolated power.
FAQ
What is the maximum data rate supported by the SI88241BC-ISR?
The SI88241BC-ISR supports a maximum data rate of 100 Mbps across all four isolation channels. This specification is guaranteed over the full operating temperature range (–40 °C to +125 °C) and applies to both rising and falling edges. The SI88241BC-ISR achieves this using RF-based on/off keying modulation, which maintains signal integrity at high speeds without requiring complex encoding or initialization sequences.
Does the SI88241BC-ISR require external components to operate its DC-DC converter?
Yes, the SI88241BC-ISR requires external components to operate its integrated DC-DC converter: a miniature transformer, input/output capacitors (C2, C3), blocking capacitor (C1), Schottky rectifier diode (D1), and resistive divider (R1/R2) for output voltage setting. Unlike Si884xx/Si886xx variants, it does not require an external FET or current sense resistor, as its internal VSW switch handles primary-side drive up to 5.5 V.
What safety certifications apply to the SI88241BC-ISR?
The SI88241BC-ISR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1, and CQC GB4943.1. These certifications validate its suitability for end equipment requiring reinforced isolation in industrial and automotive applications. It is also AEC-Q100 qualified for automotive-grade reliability, including temperature cycling and HTOL stress testing.
Can the SI88241BC-ISR generate 24 V output?
No, the SI88241BC-ISR is designed for low-voltage input (3–5.5 V) and supports only 3.3 V or 5.0 V regulated outputs. Generating 24 V requires Si884xx or Si886xx variants, which use external FETs and current sense resistors to handle higher primary-side voltages. Attempting 24 V output with SI88241BC-ISR would exceed its internal switch voltage rating and invalidate safety certifications.
How is the shutdown function implemented on the SI88241BC-ISR?
The shutdown function on the SI88241BC-ISR is controlled by the SH pin (Pin 10). When driven high (≥2.0 V), it disables the internal DC-DC converter while leaving digital isolation channels fully operational. For normal operation, SH must be tied to GNDA. This feature allows independent power gating of the isolated supply without disrupting signal transmission - useful in low-power sleep modes or fault recovery sequences.
SI88241BC-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:
- 3/1
- 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
SI88241BC-ISR FAQ
1.How can I place an order for SI88241BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88241BC-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 SI88241BC-ISR reliable?
The price and inventory of SI88241BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88241BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88241BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88241BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88241BC-ISR?
SI88241BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88241BC-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 SI88241BC-ISR?
For technical support, including SI88241BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88241BC-ISR requirements.
6.How does Aetrix verify that SI88241BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88241BC-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 SI88241BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88241BC-ISR?
All SI88241BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88241BC-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 SI88241BC-ISR part is unused and in its original packaging.
Return procedure for SI88241BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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