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Skyworks Solutions Inc. SI8285BC-AS
- Part No.:
- SI8285BC-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8285BC-AS.pdf
- Description:
- DGT ISO 3.75KV 1CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,914
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Product details
Overview
SI8285BC-AS from Skyworks is an automotive-grade, isolated high-current gate driver with integrated DC-DC converter, designed for SiC FETs and IGBTs in traction inverters and on-board chargers. It delivers 4 A peak source/sink drive current, supports 5.0 kVrms isolation (UL 1577), features desaturation detection with <1 µs response, and operates across –40 to 125 °C.
For engineers reviewing the SI8285BC-AS datasheet, SI8285BC-AS pinout, SI8285BC-AS application, or SI8285BC-AS equivalent, this page provides verified technical context, validated pin functions, confirmed SiC/IGBT motor control use cases, and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The SI8285BC-AS implements a proprietary RF-based silicon isolation barrier enabling 125 kV/µs common-mode transient immunity and reinforced insulation per UL 1577, IEC 62368-1, and GB4943.1-2011. Its dual-channel architecture includes complementary digital inputs (IN+, IN–), separate VH/VL gate drive outputs, and integrated Miller clamp to suppress parasitic turn-on in half-bridge topologies.
It integrates a feedback-controlled DC-DC controller supporting external power switches, programmable switching frequency, soft-start, and shutdown - all configurable via SH/FC, SS, and RSTb pins. The device uses a dedicated DSAT pin with 7 V threshold and 220 mV hysteresis for ultra-fast desaturation fault detection and controlled soft shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVrms withstand voltage (UL 1577, 1 min) - enables reinforced insulation in high-voltage EV traction systems. |
| Peak Output Current | ±4 A source/sink - sufficient to rapidly charge/discharge SiC FET gates with low Qg in high-frequency inverters. |
| Desat Detection Threshold | 7 V nominal with 220 mV hysteresis - precisely detects IGBT VCE or SiC FET VDS overvoltage during fault conditions. |
| CMTI | 125 kV/µs - ensures reliable operation under fast dV/dt transients in 800 V battery architectures. |
| Operating Temperature | –40 to +125 °C - meets AEC-Q100 Grade 1 requirements for under-hood automotive applications. |
| UVLO Threshold | 13 V (VDDB–VMID) - optimized for SiC FET gate bias stability and safe turn-off margin. |
| DC-DC Efficiency | 83% - reduces thermal load on driver-side supply while enabling compact isolated bias generation. |
Pinout & Package
SI8285BC-AS is housed in a 24-pin wide-body SOIC package (WB SOIC-24) with creepage/clearance compliant with reinforced insulation standards. Pin layout follows Skyworks' standardized Si828x family configuration for automotive-grade variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Complementary digital input pair | Accepts CMOS-level PWM signals; supports active-high (IN+) or active-low (IN–) control without external logic inversion. |
| VH, VL | Separate gate drive outputs | Enables independent optimization of turn-on (via RH) and turn-off (via RL) resistors for precise SiC FET dV/dt control. |
| DSAT | Desaturation sense input | Monitors switch VCE/VDS via external RDSAT/DDSAT; triggers <1 µs soft shutdown upon exceeding 7 V threshold. |
| /FLT, /RST | Open-drain fault output & active-low reset | /FLT asserts low on desat/UVLO fault; /RST must be pulsed low ≥350 ns to clear fault and restore operation. |
| RDY | Power-ready status indicator | Push-pull output goes high only when both VDDA and VDDB exit UVLO - confirms full system power readiness before enabling PWM. |
| SH/FC, SS | DC-DC control inputs | SH/FC sets switching frequency; SS enables soft-start - critical for EMI reduction and inrush current management in OBCs. |
| CLMP | Miller clamp control | Actively clamps gate to VMID during high dV/dt events - prevents parasitic turn-on in half-bridge configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC controller with external switch | Supports high-input-voltage rails (e.g., 12 V automotive) and delivers regulated VDDB up to 30 V - eliminates need for discrete isolated bias supplies. |
| Programmable soft-start & shutdown | Reduces inrush current and EMI during power-up/down cycles - essential for meeting CISPR 25 Class 5 emissions in EV subsystems. |
| Dedicated desaturation detection with blanking timer | Configurable blanking time via external CBL capacitor - avoids false faults during SiC FET turn-on transients while retaining <1 µs fault response. |
| Mirror-clamped Miller protection | Internal NMOS clamp actively pulls gate to VMID during high dV/dt - eliminates need for external Miller clamp transistor in most designs. |
| AEC-Q100 Grade 1 qualification | Validated for –40 to +125 °C operation with PPAP documentation, IMDS/CAMDS compliance, and zero-defect manufacturing flow - required for traction inverter deployment. |
Applications
| Electric Vehicle Traction Inverter | Automotive On-Board Charger (OBC) |
|---|---|
Use Scenario: High-power 3-phase inverter driving SiC FETs in 400–800 V battery systems with >100 kHz switching. IC Role / Device Role / Timing Role: Isolated gate driver providing 4 A peak drive, desat protection, and 5.0 kVrms reinforced insulation between MCU and power stage. Use Value: Enables fast, robust SiC switching with <1 µs fault response and 125 kV/µs CMTI - directly supporting ISO 26262 ASIL-C functional safety goals. |
Use Scenario: Bidirectional AC/DC and DC/DC conversion in 11 kW OBCs using interleaved totem-pole PFC and CLLC resonant stages. IC Role / Device Role / Timing Role: Dual-channel isolated driver controlling high-side/low-side SiC FETs with integrated DC-DC bias supply and programmable frequency tuning. Use Value: Reduces BOM count by integrating isolated gate drive and bias generation - simplifies layout and improves thermal performance in space-constrained OBC modules. |
| Industrial Motor Drive Inverter | Renewable Energy Solar Inverter |
Use Scenario: Variable-speed drive for HVAC compressors and industrial pumps using 650 V/1200 V SiC modules. IC Role / Device Role / Timing Role: High-CMTI isolated driver with Miller clamp and soft shutdown protecting against shoot-through and overcurrent in 20–50 kHz PWM operation. Use Value: Delivers stable gate drive under harsh EMI environments (e.g., factory floors) - eliminates need for external noise filters or gate drive transformers. |
Use Scenario: String-level MPPT and grid-tie inverter stages in commercial solar farms using 1700 V SiC FETs. IC Role / Device Role / Timing Role: Reinforced-isolation driver enabling high-voltage DC link operation (up to 1500 V) with desat detection and UVLO monitoring on both sides. Use Value: Supports extended lifetime and reliability in outdoor deployments via AEC-Q100 temperature grading and 5.0 kVrms isolation - reducing field failure rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8284BD-AS | Same 24-pin WB SOIC package and AEC-Q100 Grade 1 rating, but 5.0 kVrms isolation and 13 V UVLO - matches SI8285BC-AS's core specs exactly. | Identical functional scope: SiC/IGBT traction inverters, OBCs, and industrial drives requiring 5 kV isolation and 13 V UVLO. | Select Si8284BD-AS if exact 5.0 kVrms/13 V UVLO matching is required and DC-DC frequency control is needed - same pinout and layout compatibility. |
| UCC5870QDWJRQ1 | Texas Instruments part in 32-pin VQFN; offers 5.7 kVrms isolation, 10 A peak drive, and integrated current sensing - higher drive strength but different package and footprint. | Better suited for ultra-high-power traction inverters (>200 kW) where 10 A drive and current feedback are mandatory; not drop-in compatible. | Choose UCC5870QDWJRQ1 only when higher peak current or integrated current sensing is required - requires PCB redesign and new thermal layout. |
Compared with SI8285BC-AS, Si8284BD-AS provides identical isolation, UVLO, and package - making it a direct functional and mechanical match, whereas UCC5870QDWJRQ1 trades pin compatibility for higher drive capability and sensing integration, necessitating full hardware revalidation.
Availability
SI8285BC-AS is available at Aetrix Electronics and suitable for electric vehicle traction inverters, automotive on-board chargers, and industrial motor drives requiring stable component supply, AEC-Q100 compliance, and reinforced 5.0 kVrms isolation.
Supply support for SI8285BC-AS 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 for automotive, industrial, and communications markets.
The SI8285BC-AS belongs to Skyworks' Si828x family of automotive-grade isolated gate drivers - engineered specifically for high-reliability SiC and IGBT control in EV powertrain systems demanding AEC-Q100 Grade 1 operation and reinforced insulation.
FAQ
What is the isolation voltage rating of the SI8285BC-AS and which safety standards does it meet?
The SI8285BC-AS provides 5.0 kVrms isolation per UL 1577 for 1 minute and is certified to IEC 62368-1 and GB4943.1-2011 for reinforced insulation. This rating is validated across its full operating temperature range (–40 to +125 °C) and supports functional safety requirements in ASIL-C automotive systems. SI8285BC-AS achieves this using Skyworks' proprietary silicon RF isolation technology, not optocoupler-based methods.
Does the SI8285BC-AS support SiC FETs with 13 V gate drive, and how is UVLO configured?
Yes, the SI8285BC-AS is explicitly rated for 13 V UVLO (VDDB–VMID), optimized for SiC FET gate bias stability and safe turn-off margins. Its UVLO circuit unconditionally pulls VL low when VDDB falls below 13 V, and remains latched until VDDB rises above 13 V + hysteresis. This ensures robust gate drive during low-battery or brownout conditions in automotive applications. SI8285BC-AS maintains this behavior across its full –40 to +125 °C range.
How does the desaturation detection work on the SI8285BC-AS, and what is its response time?
The SI8285BC-AS monitors switch VCE/VDS via the DSAT pin using a 7 V threshold and 220 mV hysteresis. Upon detecting overvoltage, it initiates soft shutdown within <1 µs - discharging the gate through VH and external RH to prevent destructive dV/dt. Blanking time is set externally via CBL capacitor to avoid false triggers during turn-on transients. SI8285BC-AS implements this entirely on-chip with no external comparator required.
Can the SI8285BC-AS generate its own isolated gate supply, and what is the DC-DC efficiency?
Yes, the SI8285BC-AS integrates a feedback-controlled DC-DC controller that drives an external transformer to generate isolated VDDB. It supports external power switches for high-input-voltage operation (e.g., 12 V automotive rail) and achieves 83% typical efficiency. Frequency, soft-start, and shutdown are user-configurable via SH/FC and SS pins - eliminating need for discrete isolated bias supplies. SI8285BC-AS delivers up to 30 V on VDDB with tight regulation.
Is the SI8285BC-AS pin-compatible with other Si828x family members, and what package does it use?
SI8285BC-AS uses the 24-pin wide-body SOIC (WB SOIC-24) package and shares identical pinout and functionality with Si8283/Si8284 automotive-grade variants - including SH/FC, SS, CLMP, and DSAT signal routing. It is not pin-compatible with 20-pin Si8281/Si8282 variants due to differing pin count and DC-DC control signal allocation. SI8285BC-AS maintains full layout compatibility with Si8284BD-AS and Si8284ED-AS.
SI8285BC-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 125kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 50ns, 50ns
- Pulse Width Distortion (Max):
- 5ns
- Rise / Fall Time (Typ):
- 5.5ns, 8.5ns
- Current - Output High, Low:
- 2A, 4.1A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 10V ~ 30V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Approval Agency:
- CQC, CSA, UL, VDE
SI8285BC-AS FAQ
1.How can I place an order for SI8285BC-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8285BC-AS 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 SI8285BC-AS reliable?
The price and inventory of SI8285BC-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8285BC-AS is usually 5 days.
3.What payment methods are accepted for SI8285BC-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8285BC-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8285BC-AS?
SI8285BC-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8285BC-AS 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 SI8285BC-AS?
For technical support, including SI8285BC-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8285BC-AS requirements.
6.How does Aetrix verify that SI8285BC-AS is sourced from the original manufacturer or authorized distributors?
All SI8285BC-AS 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 SI8285BC-AS meets industry standards.
7.What is the process for return or replacement of SI8285BC-AS?
All SI8285BC-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8285BC-AS, 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 SI8285BC-AS part is unused and in its original packaging.
Return procedure for SI8285BC-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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