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Skyworks Solutions Inc. SI88643BC-ASR
- Part No.:
- SI88643BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- -
- Datasheet:
-
SI88643BC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
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Product details
Overview
SI88643BC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage input (up to 24 V) to isolated 5 V or 24 V output configurations. It delivers up to 2 W average 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 where primary-side voltage exceeds 5.5 V and external FET drive is required.
For engineers reviewing the SI88643BC-ASR datasheet, SI88643BC-ASR pinout, SI88643BC-ASR application, or SI88643BC-ASR equivalent, this page details its high-voltage flyback DC-DC architecture, externally driven ESW/RSN interface, programmable soft-start and frequency control, and AEC-Q100 qualification for automotive-grade reliability under –40 to +125 °C operation.
Technical Context
The SI88643BC-ASR implements a modified isolated flyback DC-DC topology with external primary-side NMOS switch control via ESW and current sensing via RSN. Its digital isolation uses RF on/off keying across a silicon dioxide barrier, enabling robust noise immunity and sub-18 ns typical propagation delay.
It operates in high-voltage configurations only: primary-side input ≥7 V (e.g., 24 V), requiring external FET Q1 and sense resistor R4. Output voltage is regulated via secondary-side feedback through VSNS, with loop compensation at COMP using 100 kΩ series resistance and external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets UL 1577, CSA 62368-1, VDE 62368-1, and CQC GB4943.1 reinforced insulation requirements. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces including SPI, RS-485, and CAN FD in isolated domains. |
| Propagation Delay | 23 ns maximum - enables precise timing-critical applications such as motor gate driving and real-time control loops. |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power the isolated-side logic (VDDB) and small peripheral loads without additional regulators. |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
| Transient Immunity | 100 kV/µs typical - ensures reliable operation in high-noise industrial and EV powertrain systems. |
| Package | SOIC-24 wide-body - 15.4 mm × 7.5 mm footprint with creepage/clearance optimized for 5 kVRMS isolation. |
Pinout & Package
SI88643BC-ASR is housed in a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 1.27 mm pitch) with reinforced creepage and clearance for 5000 VRMS isolation. Pin functions are validated per Figure 4 and Table 1 of Skyworks datasheet 206332B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Digital isolator primary-side supply | Must be ≤5.5 V; powers A-side logic and internal controller; requires local bypass capacitor. |
| GNDA | Primary-side signal ground | Direct low-inductance connection to GNDP recommended per layout guidelines. |
| A1–A4 | Primary-side digital input channels | Unidirectional CMOS inputs; support 0–100 Mbps; no initialization required. |
| ESW | External switch driver output | Drives gate of external NMOS Q1; enables high-voltage (>5.5 V) primary-side operation. |
| RSN | Current sense input | Monitors primary-side switch current via shunt resistor R4; enables peak-current-mode control. |
| SH_FC | Shutdown and frequency control | High-level assertion shuts down DC-DC; RC network with SS sets switching frequency (200–800 kHz). |
| SS | Soft-start timing input | Capacitor-connected node controlling startup ramp rate to limit inrush current. |
| VREGA | Primary-side voltage reference | Supports external NPN bias circuit to generate VDDA when no ≤5.5 V rail is available. |
| VSNS | Secondary-side feedback input | Connects to resistor divider on VDDB side; enables secondary-referenced regulation without optocouplers. |
| COMP | Compensation node | Requires 100 kΩ series resistor + external capacitor for Type 1 loop compensation (per AN901). |
| VDDB | Secondary-side digital supply | Output of isolated DC-DC; powers B-side logic (B1–B4); regulated to 3.3 V or 5.0 V. |
| GNDB | Secondary-side signal ground | Isolated ground domain; must not be connected to GNDA except via transformer or isolation barrier. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback DC-DC with external FET drive | Enables 24 V primary-side operation using ESW/RSN interface - avoids internal switch limitations and supports higher input voltages than Si882xx/3xx. |
| Secondary-side voltage sensing | VSNS feedback eliminates need for optocouplers or auxiliary bias circuits - improves line/load regulation and system reliability. |
| Programmable soft-start and frequency | SS and SH_FC pins allow user-defined startup ramp and EMI-optimized switching frequency (200–800 kHz) - reduces radiated emissions in sensitive automotive environments. |
| AEC-Q100 Grade 1 qualification | Validated for –40 °C to +125 °C operation with AIAG PPAP documentation support - meets automotive functional safety readiness requirements. |
| RF-based digital isolation | On/off keying modulation provides >100 kV/µs transient immunity and immunity to magnetic fields - superior to pulse-width or capacitive coupling schemes. |
Applications
| Motor Control Gate Driving | Traction Inverter Monitoring |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in EV traction inverters. IC Role / Device Role / Timing Role: SI88643BC-ASR transmits isolated gate control signals (A1–A4 → B1–B4) while powering gate driver ICs via VDDB. Use Value: 23 ns max propagation delay enables tight dead-time control; 5000 VRMS isolation withstands bus voltages up to 1200 VDC. |
Use Scenario: Monitoring phase current, temperature, and DC-link voltage in high-power traction inverters with isolated ADC interfaces. IC Role / Device Role / Timing Role: SI88643BC-ASR isolates analog front-end SPI communication and supplies isolated 5 V to ADC reference and buffer stages. Use Value: Secondary-sensed regulation maintains stable VDDB under load transients; 100 Mbps supports oversampled high-resolution ADC streaming. |
| Battery Management System (BMS) | Industrial PLC Analog I/O Modules |
|
Use Scenario: Isolating cell voltage measurement and pack-level communication in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: SI88643BC-ASR powers isolated ADCs and isolates daisy-chained UART/SPI from microcontroller to monitoring ICs. Use Value: AEC-Q100 qualification ensures long-term reliability; 2 W isolated power eliminates need for separate isolated DC-DC converters per module. |
Use Scenario: Providing channel-to-channel and field-to-controller isolation in modular analog input cards for factory automation. IC Role / Device Role / Timing Role: SI88643BC-ASR isolates 4-channel sensor inputs (e.g., 4–20 mA, thermocouple) and supplies isolated 5 V to signal conditioning circuitry. Use Value: SOIC-24 package fits standard 10 mm PCB pitch; 100 kV/µs immunity prevents false triggers in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88642BC-ASR | Same SOIC-24 package and pinout; differs only in failsafe state configuration (B-side outputs default high vs. low). | Used where B-side logic requires active-high default on power-up or fault; identical DC-DC and isolation specs. | Select SI88642BC-ASR if system-level failsafe behavior mandates high-default outputs during isolation barrier loss. |
| ADUM6420ARWZ | 4-channel isolator with integrated 500 mW isolated DC-DC; uses iCoupler® transformer isolation; no external FET drive capability. | Limited to ≤5.5 V primary input; insufficient for 24 V automotive battery rail; lower power output restricts peripheral support. | Choose ADUM6420ARWZ only for low-power, low-input-voltage applications where external transformer drive is unnecessary. |
Compared with SI88643BC-ASR, SI88642BC-ASR offers identical performance with inverted failsafe logic, while ADUM6420ARWZ provides simpler integration at the cost of 75% lower isolated power and no high-voltage primary-side support - making SI88643BC-ASR the only option for 24 V–to–5 V/24 V automotive DC-DC isolation.
Availability
SI88643BC-ASR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, and industrial PLC analog I/O modules requiring stable component supply, automotive-grade qualification, and high-voltage isolated power delivery.
Supply support for SI88643BC-ASR 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 specifically for automotive and industrial systems requiring integrated signal isolation and robust isolated DC-DC conversion - eliminating optocouplers and discrete regulators in high-reliability powertrain and energy storage applications.
FAQ
What is the maximum primary-side input voltage supported by SI88643BC-ASR?
SI88643BC-ASR supports primary-side input voltages up to 24 V, as confirmed in Section 2.3.12 of the datasheet. It is designed exclusively for high-voltage configurations requiring external FET drive via ESW and current sensing via RSN - unlike Si882xx/3xx, it does not support ≤5.5 V direct primary-side operation. This makes SI88643BC-ASR suitable for 12 V and 24 V automotive battery rails and industrial 24 V control systems.
Does SI88643BC-ASR require an external transformer? If so, what specifications are validated?
Yes, SI88643BC-ASR requires an external miniature transformer. Validated transformers include 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, 1.0:1.0 ratio, 5 kVRMS). These are listed in Table 2 of datasheet 206332B and support the flyback topology with external FET drive. SI88643BC-ASR does not integrate transformer windings.
How is the isolated output voltage regulated on SI88643BC-ASR?
SI88643BC-ASR regulates its isolated output voltage (VDDB) using secondary-side feedback via the VSNS pin. A resistor divider on the VDDB side connects to VSNS, allowing the error amplifier to compare against an internal reference and transmit correction across the isolation barrier. This eliminates optocouplers and improves regulation accuracy - a key differentiator from legacy isolated DC-DC architectures. The equation VOUT = VSNS × (1 + R1/R2) + IOFFSET × R1 applies.
What is the purpose of the RSN and ESW pins on SI88643BC-ASR?
RSN (current sense input) and ESW (external switch driver output) enable SI88643BC-ASR's high-voltage flyback operation. ESW drives the gate of an external NMOS transistor (Q1), while RSN monitors the source current through a shunt resistor (R4) to implement peak-current-mode control. Together, they replace internal switches, allowing safe operation at primary-side voltages beyond 5.5 V - essential for 24 V automotive and industrial applications.
Is SI88643BC-ASR qualified for automotive use, and what documentation is available?
Yes, SI88643BC-ASR is AEC-Q100 qualified (Grade 1, –40 °C to +125 °C) and supports AIAG-compliant PPAP documentation, IMDS and CAMDS listings, and full automotive traceability. This qualification is explicitly stated in the datasheet's "Automotive Grade" section and Safety Regulatory Approvals table. It is certified to UL, CSA, VDE, and CQC standards for reinforced insulation, confirming suitability for safety-critical automotive subsystems.
SI88643BC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- -
- Number of Channels:
- -
- Voltage - Isolation:
- -
- Common Mode Transient Immunity (Min):
- -
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Current - Output High, Low:
- -
- Current - Peak Output:
- -
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- -
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
- Approval Agency:
- -
SI88643BC-ASR FAQ
1.How can I place an order for SI88643BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88643BC-ASR 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 SI88643BC-ASR reliable?
The price and inventory of SI88643BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88643BC-ASR is usually 5 days.
3.What payment methods are accepted for SI88643BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88643BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88643BC-ASR?
SI88643BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88643BC-ASR 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 SI88643BC-ASR?
For technical support, including SI88643BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88643BC-ASR requirements.
6.How does Aetrix verify that SI88643BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88643BC-ASR 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 SI88643BC-ASR meets industry standards.
7.What is the process for return or replacement of SI88643BC-ASR?
All SI88643BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88643BC-ASR, 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 SI88643BC-ASR part is unused and in its original packaging.
Return procedure for SI88643BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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