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Skyworks Solutions Inc. SI8281BC-ISR
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- Part No.:
- SI8281BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8281BC-ISR.pdf
- Description:
- DGTL ISO 5KV 1CH GATE DVR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
SI8281BC-ISR from Skyworks is a SiC FET–ready isolated gate driver with integrated DC-DC converter, 3.75 kVrms isolation, 13 V UVLO threshold, and dedicated desaturation (DSAT) detection for high-reliability inverter and motor control systems. It drives SiC FETs, IGBTs, and power MOSFETs in traction inverters and industrial UPS systems.
For engineers reviewing the SI8281BC-ISR datasheet, SI8281BC-ISR pinout, SI8281BC-ISR application, or SI8281BC-ISR equivalent, this product delivers verified desaturation protection (<1 µs response), integrated Miller clamp, 125 kV/µs CMTI, and automotive-grade AEC-Q100 qualification - critical for high-speed switching in EV and renewable energy designs.
Technical Context
The SI8281BC-ISR implements RF-based silicon isolation with on/off keying modulation, enabling robust noise immunity and no startup initialization. Its dual-channel architecture separates input logic (VDDA side) from driver output (VDDB side), with independent UVLO monitoring on both rails and push-pull RDY signaling of dual-rail readiness.
It integrates a fixed-frequency DC-DC controller with internal power switches, supporting up to 30 V driver-side supply and delivering 83% efficiency. The device features complementary digital inputs (IN+/IN−), soft shutdown via controlled gate discharge, and active-low FLTb fault reporting with RSTb reset recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVrms per UL 1577 - enables reinforced insulation in 600 V+ SiC inverter stages without external isolation barriers |
| UVLO Threshold | 13 V (VDDB–VMID) - matches SiC FET gate drive requirements and prevents partial turn-on during brownout |
| CMTI | 125 kV/µs - ensures reliable operation under fast dV/dt transients in half-bridge configurations |
| DESAT Response Time | <1 µs - provides ultra-fast short-circuit protection before IGBT/SiC FET thermal runaway |
| DC-DC Efficiency | 83% - reduces heat generation and simplifies thermal design for compact gate driver layouts |
| Operating Temp | –40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions |
| Package | Wide-body SOIC-20 - provides creepage/clearance compliance for reinforced insulation at 3.75 kVrms |
Pinout & Package
SI8281BC-ISR is housed in a RoHS-compliant wide-body SOIC-20 package (7.5 mm body width, 1.27 mm pitch) with 3.75 kVrms reinforced insulation rating and 8.3 mm creepage distance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Complementary digital input pair | Enables active-high or active-low gate control; differential routing improves noise immunity in high-dV/dt environments |
| VH, VL | Separate gate drive outputs | Allows independent gate resistor selection for precise control of SiC FET rise/fall times and shoot-through prevention |
| DSAT | Desaturation sense input | Monitors VDS/VCE via external RDSAT/DDSAT; triggers soft shutdown within <1 µs upon overcurrent detection |
| CLMP | Miller clamp control terminal | Activates internal NMOS to clamp gate during high dV/dt events, preventing parasitic turn-on in half-bridge topologies |
| /FLT, /RST | Open-drain fault output & active-low reset | Provides system-level fault signaling and controlled recovery; requires external pull-up for noise-immune operation |
| RDY | Push-pull ready indicator | Signals valid VDDA and VDDB supply presence - used for safe PWM enable sequencing in multi-driver systems |
| VDDA, GNDA | Primary-side logic supply and ground | Accepts 3.3 V or 5 V MCU interface; GNDA must be isolated from VSSB/VMID to maintain barrier integrity |
| VDDB, VSSB, VMID | Secondary-side driver supply, return, and mid-point reference | Supports positive/negative gate bias configurations; VMID tied to VSSB when negative bias not used |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DESAT detection | 7 V threshold with 220 mV hysteresis and programmable blanking via external CBL capacitor - eliminates need for discrete protection circuitry |
| Soft shutdown | Controlled gate discharge path through VH/RH - limits dV/dt during fault recovery to prevent secondary breakdown of SiC FETs |
| Mirror clamp | On-chip NMOS clamps gate to VMID during high dV/dt - suppresses Miller-induced false turn-on without external transistor |
| Feedback-controlled DC-DC | Closed-loop current-mode controller with dithering - reduces EMI emissions and enables stable 15 V output from 5 V input |
| System safety signaling | Dedicated /FLT, /RST, and RDY pins with defined timing behavior - enables deterministic fault handling in ASIL-B/C systems |
Applications
| Industrial Inverters | EV Traction Inverters |
|---|---|
Use Scenario: Driving 1200 V SiC half-bridge modules in solar string inverters and grid-tied energy storage systems. IC Role / Device Role / Timing Role: Isolated gate driver providing reinforced insulation, DESAT protection, and synchronized dual-channel control for bidirectional power flow. Use Value: Enables >99% system efficiency by minimizing switching losses while maintaining <1 µs fault response - critical for UL 1741 SA compliance. |
Use Scenario: Controlling SiC power modules in 400 V/800 V battery-powered traction inverters for BEVs. IC Role / Device Role / Timing Role: AEC-Q100 qualified isolated driver with 125 kV/µs CMTI and soft shutdown - ensures functional safety in ASIL-C motor control loops. Use Value: Eliminates need for external Miller clamp and DESAT comparator, reducing BOM count by 4 components per channel and PCB area by 18 mm². |
| Industrial Motor Drives | Isolated SMPS |
Use Scenario: Gate driving IGBTs in variable-frequency drives for HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: High-current isolated driver with 13 V UVLO and integrated DC-DC - sustains gate drive under line sags and maintains torque stability. Use Value: Reduces system-level thermal derating by delivering 4 A peak source/sink current with 30 V driver rail - extends inverter lifetime in 55 °C ambient enclosures. |
Use Scenario: Providing isolated auxiliary power and gate drive in telecom rectifiers and server PSUs with 48 V input. IC Role / Device Role / Timing Role: Integrated DC-DC controller with transformer feedback - replaces discrete flyback IC + optocoupler + gate driver combo. Use Value: Achieves 83% DC-DC efficiency at 1 W load with <100 mV output ripple - simplifies thermal management and meets EN 62368-1 reinforced insulation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8281CC-ISR | 12 V UVLO threshold instead of 13 V; identical pinout, isolation, and feature set | Better suited for 12 V gate drive systems using standard IGBTs; less margin for SiC FET VGS(th) variation | Select SI8281BC-ISR when driving 13–15 V-gated SiC FETs requiring tighter UVLO headroom |
| Si8281DC-ISR | 13 V UVLO like SI8281BC-ISR but with 5 kVrms isolation rating instead of 3.75 kVrms | Required for 1000 V+ DC bus applications (e.g., megawatt wind converters); wider creepage demands larger PCB spacing | Choose SI8281BC-ISR for cost-sensitive 600–900 V SiC inverter designs where 3.75 kVrms meets IEC 62109 and UL 62368-1 |
Compared with Si8281CC-ISR and Si8281DC-ISR, SI8281BC-ISR offers optimal balance of SiC-specific 13 V UVLO, 3.75 kVrms isolation, and SOIC-20 footprint - reducing layout complexity and component count in mainstream EV onboard chargers and industrial servo drives.
Availability
SI8281BC-ISR is available at Aetrix Electronics and suitable for industrial inverters, EV traction systems, and isolated switch-mode power supplies requiring stable component supply across multi-year production cycles.
Supply support for SI8281BC-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 Si828x family was designed specifically for high-reliability SiC and GaN power systems, integrating gate drive, isolation, protection, and DC-DC conversion into a single package to simplify high-voltage inverter design.
FAQ
What is the isolation voltage rating of the SI8281BC-ISR?
The SI8281BC-ISR has a certified 3.75 kVrms withstand voltage per UL 1577, achieved via Skyworks' proprietary silicon isolation technology. This rating applies to the full operating temperature range (–40 °C to +125 °C) and supports reinforced insulation per IEC 62368-1 and VDE EN 62368-1. The SI8281BC-ISR does not support the 5 kVrms option found in variants like SI8281BD-ISR.
Does the SI8281BC-ISR support soft shutdown during desaturation faults?
Yes, the SI8281BC-ISR implements hardware-controlled soft shutdown upon DESAT detection: it disables the high-power driver stage and uses a weak pull-down path through VH and external RH to discharge the gate slowly. This limits dV/dt and prevents secondary breakdown of SiC FETs. The SI8281BC-ISR performs this action autonomously without MCU intervention - a core safety feature confirmed in the official datasheet Section 2.3 and Figure 3.4.
What UVLO threshold does the SI8281BC-ISR use, and why is it significant for SiC FETs?
The SI8281BC-ISR features a 13 V undervoltage lockout (UVLO) threshold referenced between VDDB and VMID. This value is specifically selected to ensure full enhancement of 15 V-gated SiC FETs while maintaining sufficient margin above typical VGS(th) spread (3–5 V). Using SI8281BC-ISR avoids partial turn-on and conduction loss spikes that occur if UVLO falls below 12.5 V - a key reliability differentiator versus generic 12 V UVLO drivers.
Can the SI8281BC-ISR drive both IGBTs and SiC FETs effectively?
Yes, the SI8281BC-ISR is explicitly validated for both IGBT and SiC FET gate driving. Its 4 A peak source/sink current, 30 V driver supply capability, integrated Miller clamp, and 7 V DESAT threshold with 220 mV hysteresis are optimized for the dynamic requirements of modern SiC devices while remaining fully compatible with 600–1200 V IGBTs. Skyworks confirms this dual compatibility in the Si8281/82/83/84 datasheet introduction and Table 1.1.
Is the SI8281BC-ISR AEC-Q100 qualified for automotive use?
No - the SI8281BC-ISR is an industrial-grade part (suffix "-I"). Its automotive-grade counterpart is SI8281BC-AS, which undergoes full AEC-Q100 stress testing, PPAP documentation, and IMDS/CAMDS compliance. While SI8281BC-ISR shares identical electrical parameters and package with SI8281BC-AS, it lacks the automotive process controls and qualification evidence required for ASIL-B/C systems. For automotive designs, SI8281BC-AS must be specified.
SI8281BC-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:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/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:
- 2.5A, 3A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 2.8V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
- Approval Agency:
- CQC, CSA, UL, VDE
SI8281BC-ISR FAQ
1.How can I place an order for SI8281BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8281BC-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 SI8281BC-ISR reliable?
The price and inventory of SI8281BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8281BC-ISR is usually 5 days.
3.What payment methods are accepted for SI8281BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8281BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8281BC-ISR?
SI8281BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8281BC-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 SI8281BC-ISR?
For technical support, including SI8281BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8281BC-ISR requirements.
6.How does Aetrix verify that SI8281BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI8281BC-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 SI8281BC-ISR meets industry standards.
7.What is the process for return or replacement of SI8281BC-ISR?
All SI8281BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8281BC-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 SI8281BC-ISR part is unused and in its original packaging.
Return procedure for SI8281BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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