My Inquiry
My Account
Skyworks Solutions Inc. SI88240BC-ISR
.jpg)
- Part No.:
- SI88240BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88240BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,643
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI88240BC-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 SI88240BC-ISR datasheet, SI88240BC-ISR pinout, SI88240BC-ISR application, or SI88240BC-ISR equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts for system-level design and supply chain continuity.
Technical Context
The SI88240BC-ISR implements four unidirectional RF-based digital isolation channels using capacitive silicon dioxide barriers, with on/off keying modulation for high noise immunity and no startup initialization required. Its integrated flyback DC-DC controller operates in peak current mode, senses output voltage on the secondary side via VSNS, and transmits error feedback across the isolation barrier.
This variant uses internal power switches (VSW), supports 3.3/5.0 V input-to-isolated 3.3/5.0 V output configurations, includes shutdown (SH pin), soft-start (SS pin), and fixed 250 kHz switching frequency. It requires only external passive components and a miniature transformer-no optocoupler or secondary-side bias circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute per UL 1577; reinforced insulation certified to IEC 62368-1. |
| Data Rate | Up to 100 Mbps; enables high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer isolation. |
| Propagation Delay | ≤23 ns max; ensures tight timing alignment in real-time control loops and synchronized sampling systems. |
| DC-DC Output Power | 2 W average at 5.0 V; sufficient to power secondary-side MCU, ADC, or gate drivers without external regulators. |
| Transient Immunity | 100 kV/µs typical common-mode transient immunity; maintains signal integrity in noisy motor drive environments. |
| Operating Temp | –40 °C to +125 °C; qualified for automotive-grade operation per AEC-Q100 Grade 1. |
| Package | SOIC-20 wide-body (7.5 mm body width); meets creepage/clearance requirements for 5 kVRMS isolation. |
Pinout & Package
SI88240BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (7.5 mm body width) with 0.65 mm pitch and reinforced creepage/clearance for 5000 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1–A4 inputs | Primary-side digital input signals; CMOS-compatible, 3.3/5 V logic levels. |
| 5, 6 | GNDP, VSW | Primary-side ground and internal switch output; connects to transformer primary winding. |
| 7, 8 | VDDP, VDDA | Primary-side power stage and signal supply; decoupled separately for noise isolation. |
| 9, 10 | GNDA, SH | Primary-side signal ground and shutdown control; SH = high disables DC-DC converter. |
| 11–14 | B1–B4 outputs | Secondary-side isolated digital outputs; drive loads directly up to 10 mA per channel. |
| 15, 16 | GNDB, VDDB | Secondary-side ground and signal supply; powered by integrated DC-DC output. |
| 17, 18 | DNC/VREGB, NC | DNC/VREGB is Do-Not-Connect for ≤5.5 V outputs; NC is unconnected silicon pad. |
| 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 magnetic coupling sensitivity and startup configuration; achieves 100 Mbps with 23 ns delay. |
| Secondary-side voltage sensing | Enables precise regulation without optocouplers or secondary bias circuits-reduces BOM count by ≥3 components. |
| Integrated soft-start & shutdown | SS pin controls inrush current limiting; SH pin enables system-level power sequencing and fault recovery. |
| Transformer-driven flyback topology | Supports standard off-the-shelf transformers (e.g., Coilcraft TA7618-AL); eliminates custom magnetics design. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and traction inverter control stages. |
Applications
| Industrial Motor Control | PLC Digital I/O Isolation |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and feedback from microcontroller to IGBT/MOSFET half-bridge in servo drives. IC Role / Device Role / Timing Role: SI88240BC-ISR provides bidirectional signal isolation (A→B for PWM, B→A for fault reporting) and powers isolated gate driver ICs. Use Value: 23 ns propagation delay ensures <100 ns total timing skew across all four channels, critical for dead-time accuracy in 20 kHz switching inverters. |
Use Scenario: Isolating 24 V digital inputs/outputs between field devices and PLC CPU backplane in harsh factory environments. IC Role / Device Role / Timing Role: SI88240BC-ISR acts as a 4-channel digital isolator with integrated 5 V supply for downstream optocoupler replacements. Use Value: Eliminates need for separate isolated DC-DC converters per I/O module, reducing board area by 35% and component count by 6+ parts. |
| Battery Management Systems | Traction Inverter Control |
|
Use Scenario: Isolating cell voltage monitoring and balancing signals between battery pack and MCU in EV battery packs. IC Role / Device Role / Timing Role: SI88240BC-ISR isolates analog front-end SPI bus and supplies isolated 3.3 V to ADC reference and multiplexer. Use Value: 100 kV/µs CMTI prevents false triggering during high-di/dt events during pack contactor switching. |
Use Scenario: Isolating MCU PWM commands and desaturation fault feedback in dual-motor traction inverters. IC Role / Device Role / Timing Role: SI88240BC-ISR delivers isolated 5 V power and four synchronized PWM channels with matched delay. Use Value: Matched propagation delay across all four channels ensures <±1 ns inter-channel skew, enabling precise phase alignment in dual-motor torque vectoring. |
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 |
|---|---|---|---|
| ADUM6420ARWZ | 4-channel isolator + 500 mW isolated DC-DC; lower power, no soft-start or shutdown pin; SOIC-20W same footprint. | Limited to low-power secondary-side logic; insufficient for driving gate drivers or ADCs requiring >500 mW. | Select when secondary load power ≤500 mW and soft-start/shutdown not required. |
| ISO7844FDWW | 4-channel isolator only-no integrated DC-DC; requires external isolated power supply; SOIC-20W same footprint. | Increases BOM cost and layout complexity due to external transformer, rectifier, and regulator. | Select when system already provides isolated 3.3/5 V rail and maximum flexibility in power architecture is needed. |
Compared with ADUM6420ARWZ and ISO7844FDWW, the SI88240BC-ISR uniquely combines 2 W isolated power, programmable shutdown, and soft-start in a single SOIC-20W package-enabling self-contained isolation without auxiliary power design effort.
Availability
SI88240BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and traction inverter designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI88240BC-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 SI88240BC-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 combined signal and power isolation.
FAQ
What is the maximum isolated output power of the SI88240BC-ISR?
The SI88240BC-ISR delivers up to 2 W average isolated output power at 5.0 V. This is sufficient to power secondary-side microcontrollers, ADCs, or gate drivers without external regulators. Peak power capability exceeds 5 W briefly, but sustained operation is rated at 2 W under thermal limits specified in the datasheet. The SI88240BC-ISR achieves this using its internal VSW switch and requires only a miniature transformer and minimal passives.
Does the SI88240BC-ISR support adjustable DC-DC switching frequency?
No, the SI88240BC-ISR uses a fixed 250 kHz switching frequency. Unlike Si883xx/Si886xx variants that offer programmable frequency via SH_FC and SS pins, the SI88240BC-ISR (as part of the Si882xx series) has factory-trimmed internal oscillator frequency and does not support external RC tuning. This simplifies EMI filtering design but removes frequency optimization for specific noise bands.
Can the SI88240BC-ISR be used in automotive applications?
Yes, the SI88240BC-ISR is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C) and built using automotive-specific manufacturing flows. It is approved for use in battery management systems, traction inverter control, and vehicle communication buses. Regulatory certifications include UL 1577 (5000 VRMS), VDE 62368-1, and CQC GB4943.1-meeting functional safety requirements for ASIL-B systems.
What transformer is recommended for use with the SI88240BC-ISR?
Skyworks validates the Coilcraft TA7618-AL and UMEC UTB02240s transformers for the SI88240BC-ISR in 5 kVRMS applications. Both feature 1:4 turns ratio, ≤64 nH leakage inductance, 2 µH ±5% primary inductance, and 5 kVRMS isolation rating. These transformers enable full 2 W output with <1% regulation error and meet CISPR-25 Class 5 emissions limits when paired with proper snubber and layout per AN892.
How does the SI88240BC-ISR achieve secondary-side voltage regulation without optocouplers?
The SI88240BC-ISR uses an internal feedback path across its capacitive isolation barrier to transmit error voltage from the secondary-side VSNS pin to the primary-side controller. A resistor divider (R1/R2) sets the output voltage, and the error amplifier compares VSNS to an internal reference. This closed-loop scheme eliminates optocouplers, reduces component count, and improves long-term stability-unlike traditional flyback controllers requiring external bias and opto-feedback networks.
SI88240BC-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:
- 4/0
- 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:
- 20-SOIC
SI88240BC-ISR FAQ
1.How can I place an order for SI88240BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88240BC-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 SI88240BC-ISR reliable?
The price and inventory of SI88240BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88240BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88240BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88240BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88240BC-ISR?
SI88240BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88240BC-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 SI88240BC-ISR?
For technical support, including SI88240BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88240BC-ISR requirements.
6.How does Aetrix verify that SI88240BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88240BC-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 SI88240BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88240BC-ISR?
All SI88240BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88240BC-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 SI88240BC-ISR part is unused and in its original packaging.
Return procedure for SI88240BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88240BC-ISR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
