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Skyworks Solutions Inc. SI88443BD-ISR
- Part No.:
- SI88443BD-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88443BD-ISR.pdf
- Description:
- IC DGTL ISO 5KV 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
SI88443BD-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage or high-voltage-to-high-voltage conversion (e.g., 24 V input to 3.3/5 V or 24 V output). It delivers up to 5 W isolated power, supports data rates up to 100 Mbps, achieves 23 ns max propagation delay, and provides 5000 VRMS reinforced isolation. It is used in traction inverters and battery management systems requiring galvanic separation and local isolated power.
For engineers reviewing the SI88443BD-ISR datasheet, SI88443BD-ISR pinout, SI88443BD-ISR application, or SI88443BD-ISR equivalent, key selection considerations include its external switch driver (ESW), current sense input (RSN), SOIC-20 wide-body package, AEC-Q100 qualification, and suitability for automotive-grade 24 V primary-side systems with secondary-side 3.3/5 V or 24 V outputs.
Technical Context
The SI88443BD-ISR implements a modified flyback DC-DC topology with external NMOS switch control via ESW and primary-side current sensing via RSN. Its digital isolation uses RF on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and no startup initialization.
It operates in high-voltage configurations only (primary-side input ≥ 5.5 V), requires external transformer and Schottky diode, and uses secondary-side voltage sensing (VSNS) with internal error amplification and isolated feedback - eliminating optocouplers and improving load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, VDE 62368-1, and CQC GB4943.1 reinforced insulation requirements. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication (e.g., SPI, RS-485, CAN FD) across isolation barrier. |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment in real-time control loops like motor gate driving. |
| DC-DC Output Power | Up to 5 W peak - sufficient to power isolated MCU peripherals, ADCs, or gate drivers without external regulators. |
| Operating Temperature | –40 °C to +125 °C - supports under-hood automotive use and industrial ambient conditions. |
| Transient Immunity | 100 kV/µs typical - withstands fast common-mode transients in noisy power electronics environments. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - validated for automotive reliability including HTOL, TC, and ESD testing. |
Pinout & Package
SI88443BD-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance optimized for 5000 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 9, 10 | HF XMTR / HF RCVR (A1–A4, B1–B4) | Unidirectional digital signal channels: A-side inputs (XMTR) and B-side outputs (RCVR); supports 4 independent data paths. |
| 7, 8 | A1, A2 | Primary-side digital input pins - connect to controller GPIO or UART TX lines needing isolation. |
| 11, 12 | B1, B2 | Secondary-side digital output pins - drive isolated peripherals such as gate drivers or sensor interfaces. |
| 13, 14 | A3, A4 | Additional primary-side inputs - enable full-duplex or multi-signal isolation (e.g., PWM + fault feedback). |
| 15, 16 | B3, B4 | Additional secondary-side outputs - support bidirectional protocols or redundant signal paths. |
| 17 | GNDP | Primary-side power ground - must be short-traced to VDDP for stable DC-DC switching. |
| 18 | RSN | Primary-side current sense input - connects to shunt resistor for overcurrent protection and cycle-skipping control. |
| 19 | ESW | External switch driver output - drives gate of external NMOS FET (e.g., SiR626DP) for high-voltage primary-side switching. |
| 20 | VDDA | Primary-side logic supply - requires ≤5.5 V; may be derived from VREGA + external NPN if no suitable rail exists. |
Key Features
| Feature | Design Value |
|---|---|
| Fully integrated isolated DC-DC controller | Eliminates need for optocoupler-based feedback; enables precise secondary-side voltage regulation without additional isolation components. |
| External NMOS switch interface (ESW + RSN) | Supports primary-side input voltages up to 24 V while maintaining safe gate drive and current limiting via external FET and shunt. |
| Secondary-side voltage sensing (VSNS) | Enables <1% load regulation across 10–100% load range by closing feedback loop on isolated side - critical for precision analog interfaces. |
| SOIC-20 wide-body packaging | Provides 8.3 mm creepage and clearance - certified for reinforced insulation at 5000 VRMS, meeting IEC 60747-17 and UL 1577. |
| AEC-Q100 qualified operation | Validated for automotive temperature cycling, humidity, and lifetime reliability - suitable for BMS and traction inverter subsystems. |
Applications
| Traction Inverter Control | Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating gate driver signals and current/voltage feedback between MCU and IGBT/SiC modules in EV powertrain inverters. IC Role / Device Role / Timing Role: Provides four isolated digital channels plus local 5 V/3.3 V power for gate drivers and ADCs, with 23 ns timing accuracy for synchronized PWM edge control. Use Value: Enables compact, high-reliability inverter designs by replacing discrete isolators + isolated DC-DC modules - reducing BOM count and PCB area by >40%. | Use Scenario: Monitoring cell voltages and temperatures across 96-cell battery packs while maintaining isolation between high-voltage stack and low-voltage MCU domain. IC Role / Device Role / Timing Role: Delivers isolated 3.3 V power to front-end analog monitoring ICs and transmits digitized telemetry via isolated SPI links. Use Value: Achieves ±0.5 mV measurement accuracy by powering precision ADCs from regulated, low-noise isolated rail - unaffected by HV bus transients. |
| Industrial PLC Analog I/O Module | Renewable Energy Solar Inverter |
Use Scenario: Providing channel-isolated 4–20 mA loop power and digital status reporting in programmable logic controller analog input cards. IC Role / Device Role / Timing Role: Supplies isolated 5 V to current-loop transmitters and relays while transmitting configuration and fault data bidirectionally across barrier. Use Value: Supports SIL-2 functional safety compliance via reinforced 5000 VRMS isolation and AEC-Q100 reliability - eliminating need for external safety-certified DC-DC. | Use Scenario: Isolating MPPT controller signals and DC-link voltage sensing in string-level solar inverters operating at 1000 V DC bus. IC Role / Device Role / Timing Role: Transmits PWM commands to isolated half-bridge drivers and returns isolated current measurements using four dedicated channels. Use Value: Maintains system uptime during lightning-induced surges due to 100 kV/µs transient immunity - exceeding IEC 61000-4-5 Level 4 requirements. |
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 |
|---|---|---|---|
| SI88442BD-ISR | Same SOIC-20 package and pinout; differs only in failsafe default state (SI88442 defaults to high-Z on power loss, SI88443 defaults to logic low). | Suitable where fail-low behavior is required for safety-critical shutdown (e.g., motor brake activation on isolation loss). | Select SI88442BD-ISR when system safety architecture mandates active-low failsafe response. |
| ADUM6420ARWZ | 4-channel isolator with integrated 500 mW DC-DC (vs. 5 W); uses iCoupler magnetic isolation (not capacitive); no external switch interface. | Limited to low-power isolated peripherals (e.g., sensors, UART); cannot drive gate drivers or high-current loads. | Choose ADUM6420ARWZ only for space-constrained, low-power applications where 500 mW isolated rail suffices. |
Compared with SI88442BD-ISR, SI88443BD-ISR offers identical performance but guarantees fail-low output behavior - critical for active braking or emergency stop circuits. Versus ADUM6420ARWZ, it delivers 10× more isolated power and supports external FETs for 24 V input systems, making it uniquely suited for automotive and industrial high-voltage control.
Availability
SI88443BD-ISR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, industrial PLCs, and solar inverters requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for SI88443BD-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 engineered for high-reliability automotive and industrial power electronics, integrating robust digital isolation with flexible isolated DC-DC conversion to replace legacy optocoupler + discrete regulator architectures.
FAQ
What is the maximum isolated output power supported by the SI88443BD-ISR?
The SI88443BD-ISR supports up to 5 W peak isolated output power when used with an appropriately rated external NMOS FET, transformer, and rectifier. This is achieved in high-voltage configurations (e.g., 24 V input to 5 V or 24 V output) and exceeds the 2 W capability of internal-switch variants like the Si882xx series. The SI88443BD-ISR datasheet specifies this rating under thermal-limited continuous operation with proper layout and heatsinking.
Does the SI88443BD-ISR require an external transformer, and what are the validated part numbers?
Yes, the SI88443BD-ISR requires an external miniature transformer for DC-DC operation. Validated transformers include UMEC UTB02250s (7–24 V input, 3.3–5.5 V output, 5 kVRMS), Coilcraft TA7788-AL (12 V input, 5/15 V output), and Mentech TTER09-0458S1 (8–24 V input/output, 5 kVRMS). These are listed in Skyworks AN901 and meet leakage inductance, turns ratio, and isolation rating requirements specified for Si884xx devices.
How does the SI88443BD-ISR handle overcurrent protection in high-voltage DC-DC operation?
The SI88443BD-ISR implements overcurrent protection via the RSN pin, which monitors primary-side current through an external shunt resistor. When sensed current exceeds threshold, the internal controller reduces duty cycle or initiates cycle skipping - preventing FET destruction during short-circuit or overload events. This function is active in all high-voltage configurations and is detailed in Section 2.3.4 of the SI88443BD-ISR datasheet.
Can the SI88443BD-ISR be used in a 24 V to 24 V isolated DC-DC configuration?
Yes, the SI88443BD-ISR supports 24 V to 24 V isolated DC-DC conversion using a 1:1 turns-ratio transformer (e.g., Mentech TTER09-0458S1) and appropriate external components. Its external switch architecture and secondary-side feedback allow stable regulation across input/output combinations including 24 V → 3.3 V, 24 V → 5 V, and 24 V → 24 V - as confirmed in Figure 10 of the SI88443BD-ISR datasheet.
What is the role of the VREGA pin on the SI88443BD-ISR, and when must it be used?
The VREGA pin provides a 5.0 V reference output to bias an external NPN transistor for generating VDDA when no suitable ≤5.5 V supply exists on the primary side. It must be used in 24 V input systems where VDDA cannot be directly sourced - enabling self-powered operation without adding a separate linear regulator. This configuration is explicitly described in Section 2.3.5 and Figure 9 of the SI88443BD-ISR datasheet.
SI88443BD-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:
- 1/3
- 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
SI88443BD-ISR FAQ
1.How can I place an order for SI88443BD-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88443BD-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 SI88443BD-ISR reliable?
The price and inventory of SI88443BD-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88443BD-ISR is usually 5 days.
3.What payment methods are accepted for SI88443BD-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88443BD-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88443BD-ISR?
SI88443BD-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88443BD-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 SI88443BD-ISR?
For technical support, including SI88443BD-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88443BD-ISR requirements.
6.How does Aetrix verify that SI88443BD-ISR is sourced from the original manufacturer or authorized distributors?
All SI88443BD-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 SI88443BD-ISR meets industry standards.
7.What is the process for return or replacement of SI88443BD-ISR?
All SI88443BD-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88443BD-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 SI88443BD-ISR part is unused and in its original packaging.
Return procedure for SI88443BD-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88443BD-ISR Tags
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