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Skyworks Solutions Inc. SI8285BD-ASR
- Part No.:
- SI8285BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8285BD-ASR.pdf
- Description:
- DGTL ISO 5KV 1CH GATE DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
SI8285BD-ASR from Skyworks is an automotive-grade, isolated high-current gate driver with integrated DC-DC converter, designed specifically for SiC FETs and IGBTs in traction inverters and on-board chargers. It delivers 4.0 A peak source/sink drive current, supports 5.0 kVrms isolation (UL 1577), features DESAT detection with <1 µs response, and operates across –40 to +125 °C.
For engineers reviewing the SI8285BD-ASR datasheet, SI8285BD-ASR pinout, SI8285BD-ASR application, or SI8285BD-ASR equivalent, this device is selected for high-reliability EV power stages requiring integrated fault protection, soft shutdown, and reinforced insulation per EN/IEC 62368-1.
Technical Context
The SI8285BD-ASR implements a proprietary RF-based silicon isolation barrier enabling 125 kV/µs common-mode transient immunity and tight part-to-part timing matching. Its dual-channel architecture separates complementary digital inputs (IN+, IN–) from isolated gate outputs (VH, VL), with dedicated DSAT sensing and active Miller clamping to prevent 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 control - all configured via SH/FC, SS, and RSTb pins. The driver-side supply (VDDB) is regulated to 30 V with UVLO thresholds at 13 V (typical) and hysteresis for stable operation under transient load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVrms (UL 1577, 1 min); enables reinforced insulation in 800 V EV systems without additional creepage/clearance design overhead. |
| Peak Output Current | ±4.0 A; sufficient to drive large SiC FETs (e.g., 1200 V/100 A modules) with fast dV/dt control and low gate charge loss. |
| DESAT Response Time | <1 µs; ensures immediate shutdown before IGBT/SiC FET thermal runaway during short-circuit events. |
| CMTI | 125 kV/µs; maintains signal integrity in high-noise inverter environments with fast-switching SiC devices. |
| UVLO Threshold | 13 V (typical) on VDDB; matches SiC FET gate bias requirements and prevents unreliable turn-on during brownout. |
| DC-DC Efficiency | 83% (typical); reduces heat generation on driver side while delivering stable 30 V output for gate drive and logic. |
| Operating Temp | –40 to +125 °C; qualified per AEC-Q100 Grade 1, suitable for under-hood traction inverter placement. |
Pinout & Package
SI8285BD-ASR is housed in a 24-pin wide-body SOIC package (WB SOIC-24) with creepage ≥8.3 mm and clearance ≥8.3 mm, optimized for high-voltage automotive isolation barriers.
| 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 gate resistor selection for precise control of SiC FET rise/fall times and dV/dt management. |
| DSAT | Desaturation sense input | Monitors switch VDS/VCE via external RDSAT/DDSAT; triggers soft shutdown if voltage exceeds 7 V threshold after blanking period. |
| CLMP | Miller clamp control | Actively pulls gate to VMID during off-state to suppress parasitic turn-on caused by high dV/dt in half-bridge configurations. |
| RSTb | Active-low fault reset | Clears DESAT fault latching; requires ≥350 ns pulse to restore operation after fault detection and safe system verification. |
| RDY | Power-ready indicator | Push-pull output goes high only when both VDDA and VDDB exit UVLO - confirms full system power-up readiness. |
| /FLT | Open-drain fault flag | Drives low on DESAT or UVLO fault; supports wired-OR of multiple drivers for centralized fault monitoring in multi-phase inverters. |
| SH/FC, SS | DC-DC control inputs | Enable shutdown, frequency tuning, and soft-start sequencing - critical for EMI reduction and inrush current limiting in isolated supplies. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DESAT protection | 7 V threshold with 220 mV hysteresis and programmable blanking via CBL; eliminates need for external comparator and timer circuits. |
| Soft shutdown on fault | Controlled gate discharge via weak pull-down path (VH–RH–VSSB) limits dV/dt to safe levels during fault recovery - prevents secondary breakdown. |
| Reinforced insulation | UL 1577 (5 kVrms), VDE/EN 62368-1, CQC GB4943.1-2011 certified; meets automotive functional safety requirements for ASIL-B/C systems. |
| Automotive qualification | AEC-Q100 Grade 1 qualified, PPAP-supported, IMDS/CAMDS-compliant; manufactured in automotive-dedicated process flows with zero-defect methodology. |
| Miller clamp circuit | Active NMOS clamp tied to VMID; suppresses false turn-on in high dV/dt half-bridge applications without external transistor or bias network. |
Applications
| Electric Vehicle Traction Inverter | On-Board Charger (OBC) |
|---|---|
Use Scenario: High-power 3-phase inverter driving 1200 V SiC FET modules in 400/800 V battery architectures. IC Role / Device Role / Timing Role: Isolated gate driver providing timing-synchronized, fault-protected switching with DESAT detection and soft shutdown. Use Value: Enables >100 kHz switching with <1 µs fault response, reducing system overcurrent risk and improving inverter reliability under transient load faults. |
Use Scenario: Bidirectional AC/DC and DC/DC conversion stage in 11 kW OBC with SiC MOSFETs in totem-pole PFC and isolated LLC stages. IC Role / Device Role / Timing Role: Dual-channel isolated driver delivering independent gate control and integrated DC-DC supply for secondary-side logic and sensing. Use Value: Eliminates need for external isolated bias supply, reduces BOM count by 3+ components, and maintains timing accuracy across temperature and lifetime. |
| Industrial Motor Drive | Renewable Energy Inverter |
Use Scenario: Variable-speed drive for HVAC compressors and industrial pumps using 650–1200 V IGBTs or SiC FETs. IC Role / Device Role / Timing Role: High-CMTI isolated driver with UVLO tracking and Miller clamp for robust operation in electrically noisy factory environments. Use Value: Prevents spurious turn-on from motor cable EMI, extends IGBT lifetime, and simplifies PCB layout with integrated fault signaling. |
Use Scenario: Central string inverter or commercial-scale microinverter converting DC from solar arrays to grid-synchronized AC. IC Role / Device Role / Timing Role: Gate driver with integrated DC-DC converter powering auxiliary circuits (e.g., current sensing, communication ICs) on isolated high-side. Use Value: Reduces system-level isolation complexity, improves efficiency via 83% DC-DC conversion, and supports rapid fault clearing for grid-code compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8284ED-ASR | Same WB SOIC-24 package and AEC-Q100 qualification, but with 15 V UVLO and external DC-DC switch support - higher input voltage tolerance (up to 24 V). | Better suited for 12 V automotive auxiliary rails; less optimal for 5 V MCU-controlled systems where SI8285BD-ASR's 13 V UVLO aligns precisely with SiC gate bias. | Select Si8284ED-ASR only if system uses 12–24 V primary-side supply and requires maximum DC-DC flexibility; otherwise SI8285BD-ASR offers tighter SiC-specific optimization. |
| UCC5870QDWJRQ1 | Texas Instruments' 5.7 kVRMS isolated driver with integrated DC-DC; lower peak current (2.5 A), no programmable frequency, and different pinout (SOIC-16). | Lacks soft shutdown and DESAT blanking capacitor interface; requires external Miller clamp and separate fault management logic. | Choose UCC5870QDWJRQ1 only for cost-sensitive non-SiC applications where 2.5 A drive suffices and board space constraints favor smaller package - not drop-in compatible. |
Compared with Si8284ED-ASR, SI8285BD-ASR provides better SiC FET compatibility via its 13 V UVLO and optimized DESAT timing, while versus UCC5870QDWJRQ1 it delivers superior fault protection integration, higher drive strength, and automotive-grade layout-ready isolation - making it the preferred choice for next-gen EV power stages.
Availability
SI8285BD-ASR is available at Aetrix Electronics and suitable for electric vehicle traction inverters, on-board chargers, and industrial motor drives requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8285BD-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 leader in analog and mixed-signal semiconductors, specializing in RF, power management, and isolation technologies for high-performance wireless and power systems.
The Si828x family was developed to address the demanding gate drive, safety, and integration needs of SiC- and IGBT-based EV powertrains - combining robust isolation, real-time fault protection, and self-contained power in a single AEC-Q100-qualified package.
FAQ
What is the isolation voltage rating of the SI8285BD-ASR and which safety standards does it meet?
The SI8285BD-ASR has a 5.0 kVrms isolation rating per UL 1577 (1 minute). It is certified to VDE/EN 62368-1 and CQC GB4943.1-2011 for reinforced insulation. These approvals confirm its suitability for functional isolation in 800 V battery systems and support ASIL-B/C automotive safety goals. SI8285BD-ASR achieves this with Skyworks' proprietary silicon isolation barrier, not optocoupler-based methods.
Does the SI8285BD-ASR support soft shutdown during desaturation faults, and how is it implemented?
Yes, the SI8285BD-ASR implements soft shutdown on DESAT detection by disabling the high-power driver and activating a weak pull-down path through VH and an external RH resistor to discharge the gate slowly. This limits dV/dt during fault recovery and prevents secondary breakdown in SiC FETs. SI8285BD-ASR's soft shutdown is fully integrated - no external circuitry is required beyond RH and RL.
What UVLO threshold does the SI8285BD-ASR use, and why is it specified at 13 V?
The SI8285BD-ASR features a 13 V (typical) undervoltage lockout on the driver-side supply (VDDB), with 200 mV hysteresis. This value is specifically chosen to match the recommended gate bias for 1200 V SiC FETs, ensuring reliable turn-on while avoiding partial enhancement that could cause excessive conduction losses or thermal stress. SI8285BD-ASR's UVLO behavior is verified across temperature and process corners per AEC-Q100.
Can the SI8285BD-ASR drive both SiC FETs and IGBTs, and what design adaptations are needed?
Yes, the SI8285BD-ASR is explicitly validated for both SiC FETs and IGBTs. For SiC FETs, use the 13 V UVLO variant (SI8285BD-ASR), configure DSAT blanking with 220–270 pF CBL, and enable Miller clamp. For IGBTs, select 12 V or 15 V UVLO variants (e.g., SI8285CD-ASR or SI8285ED-ASR) and use 390 pF CBL. SI8285BD-ASR's ±4 A drive strength and 125 kV/µs CMTI ensure robust performance in either case.
How does the SI8285BD-ASR's integrated DC-DC converter differ from those in earlier Si828x variants like SI8281?
Unlike SI8281 (internal switch, fixed frequency, no shutdown), the SI8285BD-ASR belongs to the Si8284 subfamily - it supports external power switches, programmable frequency (via SH/FC), soft-start (SS), and shutdown control. This enables higher input voltage range (up to 24 V), better EMI control via dithering, and flexible transformer design. SI8285BD-ASR's DC-DC achieves 83% efficiency and regulates VDDB to 30 V with tight load/line regulation.
SI8285BD-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 5000Vrms
- 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, UR, VDE
SI8285BD-ASR FAQ
1.How can I place an order for SI8285BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8285BD-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 SI8285BD-ASR reliable?
The price and inventory of SI8285BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8285BD-ASR is usually 5 days.
3.What payment methods are accepted for SI8285BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8285BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8285BD-ASR?
SI8285BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8285BD-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 SI8285BD-ASR?
For technical support, including SI8285BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8285BD-ASR requirements.
6.How does Aetrix verify that SI8285BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI8285BD-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 SI8285BD-ASR meets industry standards.
7.What is the process for return or replacement of SI8285BD-ASR?
All SI8285BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8285BD-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 SI8285BD-ASR part is unused and in its original packaging.
Return procedure for SI8285BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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