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Skyworks Solutions Inc. SI8285BC-ASR
- Part No.:
- SI8285BC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8285BC-ASR.pdf
- Description:
- DGT ISO 3.75KV 1CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
SI8285BC-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 sink/source drive strength, 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 SI8285BC-ASR datasheet, SI8285BC-ASR pinout, SI8285BC-ASR application, or SI8285BC-ASR equivalent, this device is selected for high-reliability SiC gate driving where integrated fault protection, soft shutdown, and reinforced insulation per EN/IEC/VDE 62368-1 are required in automotive powertrain systems.
Technical Context
The SI8285BC-ASR implements a proprietary RF-based silicon isolation barrier enabling 125 kV/µs CMTI and stable timing over temperature and lifetime. Its dual-channel architecture provides independent VH/VL outputs with Miller clamp and dedicated DSAT pin for fast desaturation monitoring.
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. UVLO thresholds are fixed at 13 V (VDDB–VMID) with hysteresis, optimized for SiC FET biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVrms withstand voltage (UL 1577, 1 min); enables reinforced insulation in 800 V battery systems. |
| Peak Output Current | ±4.0 A sink/source; sufficient to drive high-Qg SiC FETs (e.g., 100 nC) with <50 ns propagation delay. |
| DESAT Response Time | <1 µs; ensures sub-microsecond fault detection before destructive IGBT/SiC FET failure. |
| Common-Mode Transient Immunity | 125 kV/µs; maintains signal integrity during fast dV/dt switching in motor phase legs. |
| Driver Supply Range | VDDB = 13 V (UVLO threshold); matches SiC FET gate bias requirements for robust turn-on margin. |
| Operating Temperature | –40 to +125 °C ambient; qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
| DC-DC Efficiency | 83% typical; reduces thermal load on isolated secondary side while powering gate driver circuitry. |
Pinout & Package
SI8285BC-ASR is housed in a 24-pin wide-body SOIC package (WB SOIC-24) with creepage/clearance compliant to reinforced insulation standards. Pin layout supports split ground planes and noise-isolated gate loop routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Complementary digital input pair | Accepts CMOS-level PWM; enables active-high or active-low control without external logic inversion. |
| VH, VL | Separate gate drive outputs | Allows independent gate resistor selection for precise control of SiC FET rise/fall times and dV/dt. |
| DSAT | Desaturation sense input | Monitors VDS/VCE via external RDSAT/DDSAT; triggers soft shutdown if threshold (7 V nominal) exceeded. |
| CLMP | Miller clamp control | Actively clamps gate to VMID during high dV/dt to prevent parasitic turn-on in half-bridge configurations. |
| /FLT, /RST | Open-drain fault output & active-low reset | Enables system-level fault coordination; FLTb asserts low on DESAT/UVLO; RSTb clears latched faults. |
| RDY | Power-ready indicator | Push-pull output goes high only when both primary (VDDA) and secondary (VDDB) supplies exit UVLO. |
| SH/FC, SS | DC-DC control inputs | Enable shutdown, frequency tuning, and soft-start sequencing for EMI-optimized isolated supply generation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DESAT protection | 7 V threshold with 220 mV hysteresis and blanking capacitor support; 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 during fault recovery to prevent secondary failures. |
| Reinforced insulation compliance | UL 1577 (5 kVrms), VDE/EN/IEC 62368-1, CQC GB4943.1-2011; certified for functional safety in ASIL-B/C systems. |
| Automotive qualification | AEC-Q100 Grade 1, PPAP documentation, IMDS/CAMDS listed; manufactured in full automotive process flow with zero-defect controls. |
| DC-DC converter flexibility | External switch topology with programmable frequency and soft-start; supports 7–24 V input and scalable output power for diverse inverter architectures. |
Applications
| Traction Inverter | On-Board Charger (OBC) |
|---|---|
|
Use Scenario: High-power 3-phase inverter driving permanent magnet synchronous motors in BEV powertrains. IC Role / Device Role / Timing Role: Isolated gate driver for SiC half-bridge modules, providing DESAT-protected switching with synchronized soft shutdown across all phases. Use Value: Enables 800 V battery operation with 125 kV/µs CMTI immunity and AEC-Q100 reliability, reducing system-level fault injection risk by >90% vs. discrete solutions. |
Use Scenario: Bidirectional AC/DC and DC/DC conversion in 11–22 kW OBCs with SiC-based totem-pole PFC and LLC stages. IC Role / Device Role / Timing Role: Dual-channel isolated driver controlling high-side/low-side SiC FETs with integrated DC-DC supply for gate bias rails. Use Value: Eliminates external isolated bias supplies; 83% DC-DC efficiency reduces thermal footprint while maintaining tight UVLO (13 V) for SiC gate stability. |
| Industrial Motor Drive | Renewable Energy Inverter |
|
Use Scenario: Variable-frequency drives for HVAC compressors and industrial pumps using 650–1200 V SiC modules. IC Role / Device Role / Timing Role: Gate driver with Miller clamp and DESAT detection, interfacing with MCU via complementary inputs and RDY/FLT signaling. Use Value: Reduces BOM count by integrating isolation, protection, and bias generation - cutting PCB area by 35% vs. optocoupler + discrete DC-DC designs. |
Use Scenario: Central and string inverters for solar PV systems requiring high-efficiency MPPT and grid synchronization. IC Role / Device Role / Timing Role: Isolated driver for SiC-based three-level NPC or T-type topologies, leveraging programmable DC-DC frequency to minimize EMI in EMI-sensitive environments. Use Value: Programmable SH/FC pin allows real-time EMI tuning without hardware change; dithering improves conducted emission margins by ≥6 dB. |
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 | 15 V UVLO threshold; same 24-pin WB SOIC package, 5 kVrms isolation, and DC-DC architecture. | Better suited for systems requiring higher gate bias headroom (e.g., 15 V SiC gate drive with margin). | Select SI8285BC-ASR when 13 V UVLO matches existing SiC FET gate driver design; choose Si8284ED-ASR only if 15 V bias is mandated. |
| UCC5870QDWJRQ1 | TI's 5.7 kVRMS reinforced isolator with 10 A peak drive; no integrated DC-DC, requires external isolated supply. | Used in high-current traction inverters where external bias supply already exists and higher peak current is needed. | SI8285BC-ASR offers lower system BOM cost due to integrated DC-DC; UCC5870QDWJRQ1 preferred only when >4 A drive or alternate isolation certification is required. |
Compared with Si8284ED-ASR, SI8285BC-ASR provides tighter UVLO matching for 13 V SiC gate biasing and identical automotive qualification; versus UCC5870QDWJRQ1, it trades peak current for integrated bias generation and reduced layout complexity in space-constrained OBC modules.
Availability
SI8285BC-ASR is available at Aetrix Electronics and suitable for traction inverters, on-board chargers, and renewable energy inverters requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for SI8285BC-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, isolation, and power management ICs.
The Si828x family was developed to address the demanding gate driving, safety, and integration needs of next-generation SiC and GaN-based power systems in automotive and industrial applications.
FAQ
What is the UVLO threshold for SI8285BC-ASR and why is it set to 13 V?
The SI8285BC-ASR has a fixed undervoltage lockout (UVLO) threshold of 13 V referenced between VDDB and VMID. This value is specifically chosen to ensure reliable turn-on of Silicon Carbide FETs, which require higher gate drive voltage (typically 12–15 V) than silicon IGBTs. The 13 V threshold provides sufficient margin above the minimum recommended gate voltage while preventing false triggering during transient dips. SI8285BC-ASR maintains this specification across its full operating temperature range and is validated per AEC-Q100.
Does SI8285BC-ASR support external transformer-based DC-DC conversion?
Yes, SI8285BC-ASR supports external transformer-based DC-DC conversion using its integrated controller. It drives an external power switch (e.g., MOSFET) on the primary side and uses Schottky rectifiers on the secondary side. The device provides SH/FC and SS pins for shutdown, frequency adjustment, and soft-start control - enabling EMI-optimized, high-efficiency (>83%) isolated bias generation. SI8285BC-ASR does not include internal power switches, distinguishing it from Si8281/Si8283 variants.
How does the DESAT detection circuit in SI8285BC-ASR operate and what components are required externally?
The SI8285BC-ASR DESAT circuit monitors VDS/VCE via the DSAT pin using an external current-limiting resistor (RDSAT), diode (DDSAT), and blanking capacitor (CBL). When the driven switch turns on, an internal current source charges CBL; if VDS/VCE remains above 7 V (with 220 mV hysteresis) beyond the blanking time, a fault is triggered. SI8285BC-ASR requires RDSAT (~100 Ω), DDSAT (fast recovery diode), and CBL (220–270 pF for SiC) placed close to the switch and DSAT pin. No external comparator or timer is needed.
Is SI8285BC-ASR pin-compatible with other Si828x family members?
No, SI8285BC-ASR is not pin-compatible with other Si828x variants. While it shares the 24-pin wide-body SOIC package with Si8283/Si8284, its pin functions differ - notably, SI8285BC-ASR uses SH/FC and SS pins for DC-DC control, whereas Si8283BC-ASR uses those same pins for different configurations. The exact pin mapping, including CLMP, VSNS, and ESW assignments, is unique to SI8285BC-ASR and must be verified against its specific datasheet schematic and pin description table.
What safety certifications does SI8285BC-ASR hold and how do they apply to automotive use?
SI8285BC-ASR holds UL 1577 (5.0 kVrms, 1 min), VDE/EN/IEC 62368-1, and CQC GB4943.1-2011 certifications - all confirming reinforced insulation suitable for functional safety in ASIL-B/C automotive systems. It is AEC-Q100 Grade 1 qualified, with PPAP documentation, IMDS/CAMDS listing, and zero-defect manufacturing flow. These certifications validate SI8285BC-ASR for use in traction inverters and on-board chargers where isolation integrity and long-term reliability under harsh conditions are mandatory.
SI8285BC-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:
- 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-ASR FAQ
1.How can I place an order for SI8285BC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8285BC-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 SI8285BC-ASR reliable?
The price and inventory of SI8285BC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8285BC-ASR is usually 5 days.
3.What payment methods are accepted for SI8285BC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8285BC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8285BC-ASR?
SI8285BC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8285BC-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 SI8285BC-ASR?
For technical support, including SI8285BC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8285BC-ASR requirements.
6.How does Aetrix verify that SI8285BC-ASR is sourced from the original manufacturer or authorized distributors?
All SI8285BC-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 SI8285BC-ASR meets industry standards.
7.What is the process for return or replacement of SI8285BC-ASR?
All SI8285BC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8285BC-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 SI8285BC-ASR part is unused and in its original packaging.
Return procedure for SI8285BC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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