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Skyworks Solutions Inc. SI88242BC-ISR
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- Part No.:
- SI88242BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88242BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
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Product details
Overview
SI88242BC-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, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and 5000 VRMS isolation rating. It operates across –40 to +125 °C and is AEC-Q100 qualified for automotive traction inverters and battery management systems.
For engineers reviewing the SI88242BC-ISR datasheet, SI88242BC-ISR pinout, SI88242BC-ISR application, or SI88242BC-ISR equivalent, this device serves as a fully integrated signal + power isolation solution requiring only an external transformer and minimal passive components - critical for space-constrained industrial motor drives and EV subsystems demanding reinforced insulation and high EMI immunity.
Technical Context
The SI88242BC-ISR implements four unidirectional RF-based digital isolation channels using capacitive silicon dioxide barriers, with on/off keying modulation for superior noise immunity and no startup initialization. Its integrated flyback DC-DC controller operates at a default 250 kHz switching frequency and senses output voltage directly on the secondary side via VSNS feedback.
This variant uses internal power switches (VSW) - not external FET drivers - and supports low-voltage configurations (3–5.5 V input to 3/5 V output). It includes shutdown (SH pin), soft-start (SS pin), and fixed-frequency operation without programmable frequency control, distinguishing it from Si883xx/Si886xx families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 100 Mbps - enables high-speed serial communication in motor control gate drivers and PLC backplanes. |
| Propagation delay | ≤23 ns max - ensures tight timing alignment between isolated control and feedback signals in real-time systems. |
| Isolation rating | 5000 VRMS for 1 minute - meets UL 1577, CSA 62368-1, and VDE 62368-1 reinforced insulation requirements. |
| DC-DC output power | 2 W average at 5 V - sufficient to power secondary-side logic (VDDB) and small peripherals without external regulators. |
| Operating temperature | –40 to +125 °C - supports under-hood automotive use and industrial environments with wide thermal swings. |
| Transient immunity | 100 kV/µs typical - maintains signal integrity during fast-switching events in inverters and SMPS. |
| AEC-Q100 grade | Qualified - validated for automotive applications including hybrid/electric vehicle battery management and traction inverters. |
Pinout & Package
SI88242BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch), optimized for creepage/clearance compliance at 5000 VRMS. Pin functions are defined per Figure 1 (Si88242) and Table 1 of the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDP | Primary-side DC-DC power supply | Accepts 3–5.5 V input to drive internal power switches; requires local bypass capacitor. |
| GNDP | Primary-side DC-DC ground | Must be short-traced to VDDP; forms return path for internal switch current. |
| VSW | Internal switch output | Drives transformer primary; not intended for external FET - distinguishes SI88242 from Si884xx/Si886xx. |
| SH | Shutdown control | Active-high signal disables DC-DC converter; tie to GND for normal operation. |
| SS | Soft-start timing | External capacitor sets inrush current ramp time; prevents input voltage droop during startup. |
| VDDA | Primary-side isolator supply | Powers transmitter circuitry; must be 3–5.5 V; decoupled locally to GNDA. |
| GNDA | Primary-side isolator ground | Separate from GNDP; connects to VDDA bypass cap and isolator inputs (A1–A4). |
| A1–A4 | Primary-side digital inputs | Unidirectional CMOS inputs; accept 3.3 V or 5 V logic; no level-shifting required. |
| VDDB | Secondary-side isolator supply | Powered by internal DC-DC; supplies receiver circuitry and B1–B4 outputs. |
| GNDB | Secondary-side isolator ground | Reference for VDDB and B1–B4; isolated from GNDA by capacitive barrier. |
| B1–B4 | Secondary-side digital outputs | CMOS outputs referenced to VDDB; drive loads up to 20 mA per channel. |
| VSNS | DC-DC feedback input | Connects to resistor divider on secondary side to regulate VDDB output voltage. |
| COMP | Loop compensation | External RC network (RCOMP = 49.9 kΩ + CCOMP) stabilizes closed-loop regulation. |
| DNC/VREGB | Do-not-connect / reference | Internally zener-clamped; leave open unless output >5.5 V (not applicable for SI88242 standard 5 V config). |
| NC | No connect | Not bonded; must remain unconnected per design. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Capacitive SiO₂ barrier with on/off keying provides 100 kV/µs transient immunity and eliminates magnetic coupling issues. |
| Integrated DC-DC controller | Self-contained flyback regulator with internal switches (VSW), eliminating need for external MOSFETs or gate drivers. |
| Secondary-side voltage sensing | VSNS feedback loop measures output directly on isolated side - enables precise line/load regulation without optocouplers. |
| Automotive-grade qualification | AEC-Q100 qualified with PPAP support and IMDS/CAMDS documentation - suitable for safety-critical EV subsystems. |
| Low EMI dithering | Controlled frequency jitter reduces peak radiated emissions - simplifies EMC compliance in dense power electronics layouts. |
Applications
| Industrial Motor Control | EV Traction Inverter Gate Drive |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in servo drives and VFDs. IC Role / Device Role / Timing Role: Provides bidirectional signal isolation (A→B for PWM, B→A for DESAT/FLT) with <23 ns skew and 5000 VRMS working voltage. Use Value: Enables compact, single-chip isolation + bias power for half-bridge drivers - reduces BOM count and PCB area vs. discrete isolator + DC-DC combo. |
Use Scenario: Powering and isolating gate driver ICs and current-sense amplifiers in 400–800 V traction inverters. IC Role / Device Role / Timing Role: Delivers regulated 5 V to secondary-side gate drivers while isolating high-speed PWM and DESAT signals. Use Value: Eliminates need for separate isolated DC-DC module; AEC-Q100 qualification ensures reliability in under-hood thermal cycling. |
| Programmable Logic Controller I/O Modules | Battery Management System (BMS) Cell Monitoring |
|
Use Scenario: Isolating digital I/O lines (DI/DO) and analog sensor interfaces in distributed control cabinets. IC Role / Device Role / Timing Role: Four independent channels isolate status, enable, and command signals; integrated DC-DC powers isolated field-side logic. Use Value: Reduces component count per I/O channel and improves system-level insulation coordination per IEC 61000-4-5 surge testing. |
Use Scenario: Isolating cell voltage and temperature measurements from microcontroller in multi-cell EV battery packs. IC Role / Device Role / Timing Role: Transfers ADC data and balancing commands across isolation barrier while powering isolated ADC front-end. Use Value: Supports functional safety (ASIL-B capable) with certified 5000 VRMS isolation and -40°C to +125°C operation across full pack voltage range. |
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 |
|---|---|---|---|
| SI88240BC-ISR | Zero-channel failsafe (all outputs low on fault); same SOIC-20 package, identical pinout and DC-DC specs. | Suitable where fail-safe shutdown is mandatory (e.g., safety interlocks), but lacks configurable failsafe mode of SI88242. | Select SI88240BC-ISR when deterministic low-state output during isolation failure is required. |
| SI88241BC-ISR | Single-channel failsafe (only A1/B1 configured as failsafe); otherwise identical electrical and thermal specs. | Used when only one signal path requires failsafe behavior (e.g., emergency stop), preserving three standard channels. | Choose SI88241BC-ISR to balance failsafe coverage and channel flexibility in mixed-criticality systems. |
Compared with SI88240BC-ISR and SI88241BC-ISR, the SI88242BC-ISR offers user-selectable failsafe configuration per channel (via external resistors), enabling granular fault response tuning without changing layout or firmware - ideal for adaptive safety architectures.
Availability
SI88242BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV traction inverters, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI88242BC-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 family was designed to replace optocoupler + discrete DC-DC combinations in high-reliability industrial and automotive systems - integrating robust signal isolation and efficient isolated power in a single SOIC package.
FAQ
What is the maximum supported data rate for SI88242BC-ISR?
The SI88242BC-ISR supports data rates up to 100 Mbps across all four isolation channels. This is verified in the datasheet's AC characteristics table and enables high-speed serial interfaces such as SPI clocked at 50 MHz or fast PWM edge transmission in gate driver applications. The SI88242BC-ISR achieves this while maintaining ≤23 ns propagation delay and channel-to-channel skew under 5 ns.
Does SI88242BC-ISR require an external transformer?
Yes, the SI88242BC-ISR requires an external miniature transformer to complete the isolated DC-DC function. Validated parts include UMEC UTB02240s (5 kVRMS, 1:4 turns ratio) and Coilcraft TA7618-AL. The transformer interfaces with VSW (primary) and the secondary winding feeds the rectifier and VSNS feedback network. No external power switch is needed - the SI88242BC-ISR uses internal switches.
What is the purpose of the SH pin on SI88242BC-ISR?
The SH (shutdown) pin on SI88242BC-ISR is an active-high control that disables the internal DC-DC converter when driven high. During normal operation, it must be tied to GND. This feature allows system-level power sequencing - for example, disabling isolated power before MCU reset - and supports functional safety states. The SI88242BC-ISR does not power down the digital isolator core when SH is asserted; only the DC-DC section halts.
Can SI88242BC-ISR generate 24 V output?
No, the SI88242BC-ISR is configured for low-voltage operation (3–5.5 V input to 3/5 V output) and lacks the external switch driver (ESW) and current sense (RSN) pins required for 24 V output configurations. For 24 V output, Skyworks specifies Si884xx or Si886xx families. Attempting to configure SI88242BC-ISR for >5.5 V violates its internal architecture and voids safety certifications.
Is SI88242BC-ISR pin-compatible with other Si8824x variants?
Yes, all Si8824x variants (SI88240, SI88241, SI88242, SI88243, SI88244) share identical SOIC-20 pinouts and mechanical footprints. Differences are limited to failsafe behavior (configurable per channel in SI88242BC-ISR) and internal logic mapping - no PCB redesign is needed when migrating between them. This enables flexible safety architecture implementation without layout changes.
SI88242BC-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:
- 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
SI88242BC-ISR FAQ
1.How can I place an order for SI88242BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88242BC-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 SI88242BC-ISR reliable?
The price and inventory of SI88242BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88242BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88242BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88242BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88242BC-ISR?
SI88242BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88242BC-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 SI88242BC-ISR?
For technical support, including SI88242BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88242BC-ISR requirements.
6.How does Aetrix verify that SI88242BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88242BC-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 SI88242BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88242BC-ISR?
All SI88242BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88242BC-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 SI88242BC-ISR part is unused and in its original packaging.
Return procedure for SI88242BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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