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Skyworks Solutions Inc. SI88441BD-ISR
- Part No.:
- SI88441BD-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88441BD-ISR.pdf
- Description:
- IC DGTL ISO 5KV 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,077
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Product details
Overview
SI88441BD-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage conversion (e.g., 24 V input to 3.3/5.0 V isolated output), supporting up to 5 W peak power and 100 Mbps data rate with 23 ns max propagation delay. It operates across –40 to +125 °C and delivers reinforced insulation rated at 5000 VRMS.
For engineers reviewing the SI88441BD-ISR datasheet, SI88441BD-ISR pinout, SI88441BD-ISR application, or SI88441BD-ISR equivalent, this device serves as a system-level isolation solution requiring external FET drive (ESW), current sensing (RSN), and secondary-side feedback (VSNS) in high-input-voltage industrial and automotive power interfaces.
Technical Context
The SI88441BD-ISR implements four unidirectional RF-based digital isolation channels using capacitive silicon dioxide barriers, with on/off keying modulation for superior noise immunity and magnetic field rejection. Its isolated flyback DC-DC controller operates in peak current mode, sensing output voltage on the secondary side via VSNS to enable precise regulation without optocouplers.
This variant belongs to the Si884xx family optimized for high-voltage primary-side operation (up to 24 V), requiring external NMOS switch drive (ESW), shunt-based current sense (RSN), and fixed 100 kΩ compensation resistance (RCOMP) at the COMP pin. It lacks shutdown (SH) and soft-start (SS) pins-features reserved for Si882xx/3xx/6xx variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute (UL 1577, reinforced insulation) |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD physical layer signaling |
| Propagation Delay | 23 ns max - enables tight timing control in real-time motor control and power converter feedback loops |
| DC-DC Output Power | Up to 5 W peak with external FET - sufficient to power isolated gate drivers, ADCs, and microcontrollers on secondary side |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments |
| Transient Immunity | 100 kV/µs typical - ensures robust operation during fast-switching power electronics transients |
| AEC-Q100 Grade | Qualified - meets stress test requirements for automotive electronic components |
Pinout & Package
SI88441BD-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance compliant for 5000 VRMS isolation. Pin functions are validated per Figure 3 and Table 1 of the Si88x4x datasheet (Rev. 206332B).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR | Four bidirectional-capable RF transmitter/receiver pairs for digital channel A1–A4 and B1–B4 across isolation barrier |
| 7, 8 | A1, A2 | Primary-side digital input/output channels 1 and 2 - referenced to VDDA/GNDA |
| 11, 12 | B1, B2 | Secondary-side digital input/output channels 1 and 2 - referenced to VDDB/GNDB |
| 13, 14 | A3, A4 | Primary-side digital input/output channels 3 and 4 - referenced to VDDA/GNDA |
| 15, 16 | B3, B4 | Secondary-side digital input/output channels 3 and 4 - referenced to VDDB/GNDB |
| 17 | GNDP | Primary-side power stage ground - must be shorted directly to VDDP with ≥15-mil trace |
| 18 | RSN | Current sense input for external FET - used in high-voltage configurations to monitor primary-side switching current |
| 19 | ESW | External switch driver output - drives gate of external NMOS FET for primary-side switching above 5.5 V |
| 20 | VDDA | Primary-side signal supply - must be ≤5.5 V; if unavailable, VREGA + external NPN supplies VDDA |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Capacitive SiO₂ barrier with on/off keying - eliminates start-up initialization and provides best-in-class EMI immunity |
| Secondary-side voltage sensing | VSNS feedback pin - enables precise isolated output regulation without optocouplers or bias circuitry |
| External FET drive architecture | ESW output + RSN sense - supports primary-side inputs up to 24 V while maintaining thermal safety and efficiency |
| Fixed 100 kΩ compensation | RCOMP = 100 kΩ at COMP pin - matches internal resistance for stable loop compensation in Si884xx/6xx flyback designs |
| AEC-Q100 qualification | Automotive-grade reliability - validated for hybrid/electric vehicle traction inverters and battery management systems |
Applications
| Industrial Motor Control | Automotive Traction Inverter |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback in 3-phase IGBT/SiC inverter stacks operating at 600–1200 V bus voltages. IC Role / Device Role / Timing Role: Provides galvanically isolated power (5 V @ 1 A) and four high-speed digital channels for PWM, fault reporting, and current-sense ADC interface. Use Value: Eliminates optocoupler latency and aging drift; 23 ns propagation delay enables <100 ns total control loop latency in closed-loop torque control. |
Use Scenario: Signal and power isolation between MCU domain and high-voltage inverter control board in HEV/EV powertrain systems. IC Role / Device Role / Timing Role: Delivers isolated 5 V supply and four digital channels for phase current sensing, temperature monitoring, and gate driver enable/disable commands. Use Value: AEC-Q100 qualification and 125 °C operation ensure long-term reliability in under-hood environments with minimal derating. |
| Isolated Switch-Mode Supply | PLC Digital I/O Module |
|
Use Scenario: Generating isolated auxiliary rails (e.g., 5 V → 24 V or 24 V → 5 V) in industrial AC/DC front-end converters. IC Role / Device Role / Timing Role: Acts as isolated flyback controller with external FET, providing regulated output while simultaneously isolating digital status/control lines. Use Value: Integrated isolation + DC-DC reduces BOM count by ≥6 components vs. discrete isolator + transformer driver + regulator solutions. |
Use Scenario: Providing channel-isolated digital input/output in modular PLC backplanes handling 24 V sensor/actuator interfacing. IC Role / Device Role / Timing Role: Supplies isolated 5 V power to downstream logic and routes four independent digital I/O signals across barrier with fail-safe default states. Use Value: 5000 VRMS rating meets IEC 61000-4-5 surge immunity requirements for industrial fieldbus nodes without additional protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88440BD-ISR | No failsafe mode; default output state undefined on power loss | Suitable for non-safety-critical monitoring paths where output state during fault is not mandated | Select when failsafe behavior is unnecessary and cost optimization is prioritized |
| SI88442BD-ISR | Includes failsafe mode with configurable default output states (high/low) on power loss or fault | Required in safety-critical I/O modules where defined logic level must persist during isolation barrier failure | Select when IEC 61508 SIL-2 or ISO 26262 ASIL-B compliance mandates predictable fault behavior |
Compared with SI88440BD-ISR and SI88442BD-ISR, the SI88441BD-ISR offers identical pinout, DC-DC architecture, and isolation specs but implements a fixed failsafe configuration-ensuring all four secondary-side outputs default to logic low during power loss, simplifying fault-handling logic in motor control gate drivers.
Availability
SI88441BD-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive traction inverters, and PLC digital I/O modules requiring stable component supply with guaranteed long-term manufacturability and automotive-grade traceability.
Supply support for SI88441BD-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 product line was developed to replace optocoupler-based isolation in high-reliability power electronics, integrating robust digital isolation with flexible isolated DC-DC conversion for industrial and automotive systems.
FAQ
What is the maximum input voltage supported by SI88441BD-ISR's DC-DC converter?
The SI88441BD-ISR is designed for high-voltage primary-side operation up to 24 V. Its ESW driver and RSN current sense inputs enable use with external NMOS FETs in flyback topologies where input exceeds 5.5 V. The device itself requires VDDA ≤ 5.5 V; if no suitable local supply exists, VREGA with external NPN transistor can generate VDDA. SI88441BD-ISR does not support internal switching above 5.5 V.
Does SI88441BD-ISR include shutdown or soft-start functionality?
No. SI88441BD-ISR omits SH (shutdown) and SS (soft-start) pins-these features are exclusive to Si882xx, Si883xx, and Si886xx variants. The SI88441BD-ISR relies on external circuitry for controlled startup and disable. Its design assumes continuous operation in high-voltage industrial and automotive applications where deterministic sequencing is managed at the system level.
How is output voltage regulated in SI88441BD-ISR?
SI88441BD-ISR uses secondary-side feedback via the VSNS pin: a resistor divider scales the isolated output voltage and feeds it into the error amplifier. The resulting error signal is encoded and transmitted across the isolation barrier to adjust the duty cycle of the external FET driven by ESW. This closed-loop method achieves superior line/load regulation without optocouplers or secondary-side bias supplies.
What transformer specifications are validated for use with SI88441BD-ISR?
Skyworks validates transformers for Si884xx in high-voltage configurations, including UMEC UTB02250s (7–24 V input, 3.3–5.5 V output, 3.0:1 turns ratio, 5 kVRMS isolation) and Mentech TTER09-0458S1 (8–24 V input/output, 1:1 ratio, 5 kVRMS). These meet leakage inductance (<600 nH), primary inductance (25 µH ±5%), and isolation requirements specified in AN901.
Is SI88441BD-ISR pin-compatible with other Si884xx variants like SI88442BD-ISR?
Yes. All Si884xx variants-including SI88441BD-ISR, SI88440BD-ISR, and SI88442BD-ISR-share identical SOIC-20 wide-body pinout and DC-DC functional pin assignments (ESW, RSN, VSNS, COMP, etc.). Differences are limited to internal failsafe configuration and are not reflected in pin function or layout, enabling drop-in replacement where functional requirements align.
SI88441BD-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:
- Not For New Designs
- 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
SI88441BD-ISR FAQ
1.How can I place an order for SI88441BD-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88441BD-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 SI88441BD-ISR reliable?
The price and inventory of SI88441BD-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88441BD-ISR is usually 5 days.
3.What payment methods are accepted for SI88441BD-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88441BD-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88441BD-ISR?
SI88441BD-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88441BD-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 SI88441BD-ISR?
For technical support, including SI88441BD-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88441BD-ISR requirements.
6.How does Aetrix verify that SI88441BD-ISR is sourced from the original manufacturer or authorized distributors?
All SI88441BD-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 SI88441BD-ISR meets industry standards.
7.What is the process for return or replacement of SI88441BD-ISR?
All SI88441BD-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88441BD-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 SI88441BD-ISR part is unused and in its original packaging.
Return procedure for SI88441BD-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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