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Skyworks Solutions Inc. SI8261BCD-ASR
- Part No.:
- SI8261BCD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 6-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8261BCD-ASR.pdf
- Description:
- DGTL ISO 5KV 1CH GT DVR 6SDIP GW
- Quantity:
- Payment:
- Shipping:
Inventory:2,247
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Product details
Overview
SI8261BCD-ASR from Skyworks Solutions is a 5 kVRMS isolated gate driver with LED-emulator input and 4.0 A peak output drive capability, designed for high-reliability IGBT/MOSFET switching in industrial inverters and motor drives. It features 60 ns propagation delay (independent of input current), rail-to-rail output voltage, and 50 kV/µs typical common-mode transient immunity.
For engineers reviewing the SI8261BCD-ASR datasheet, SI8261BCD-ASR pinout, SI8261BCD-ASR application, or SI8261BCD-ASR equivalent, this page delivers verified specifications, SOIC-8 package details, UVLO threshold (8 V), thermal derating data, and drop-in replacement guidance versus optocoupled drivers like HCPL-3120.
Technical Context
The SI8261BCD-ASR implements RF-based silicon isolation instead of optical coupling, enabling stable timing performance across temperature and lifetime. Its diode-emulator input requires only 6–30 mA forward current and exhibits 3.6 mA input threshold with 0.34 mA hysteresis.
This variant belongs to the Si826x family's "B" output drive grade (4.0 A sink) and "C" UVLO configuration (12 V nominal threshold), with dual VO pins requiring external shorting for full 4.0 A compliance. Startup time is 16–30 µs, and noise filtering rejects transients <15 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS (UL1577), 10 kV surge (VDE0884-10) - enables reinforced insulation in 600 VAC mains systems |
| Output Drive Current | 4.0 A sink (IOL), 1.8 A source (IOH) - supports fast turn-on/turn-off of high-capacitance IGBTs in 10–20 kHz inverters |
| Propagation Delay | 20–60 ns (tPLH), 10–50 ns (tPHL) - tight unit-to-unit matching (<25 ns PDD) simplifies timing-critical multi-phase gate control |
| UVLO Threshold | 7.5–9.4 V rising, 6.9–8.9 V falling (Si826xxBx mode) - prevents erratic switching during brown-out conditions in 12–24 V DC bus systems |
| Common-Mode Immunity | 35–50 kV/µs - maintains signal integrity during fast dV/dt events in SiC/GaN half-bridges |
| Supply Voltage Range | 6.5–30 V - compatible with 12 V, 15 V, and 24 V isolated auxiliary supplies without level-shifting |
| Operating Temperature | –40 to +125 °C ambient - qualified for under-hood automotive and industrial enclosure environments |
Pinout & Package
SI8261BCD-ASR is supplied in an 8-pin narrow-body SOIC package (SOIC-8, 3.9 mm width) with industry-standard pinout and creepage/clearance compliant with reinforced insulation requirements (CLR = 4.7 mm, CPG = 3.9 mm).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | LED-emulator input anode; accepts 6–30 mA forward current; reverse voltage limited to 0.3 V |
| 2 | Cathode | LED-emulator input cathode; referenced to system ground or controller-side GND |
| 3 | NC | No connect - must be left floating or tied to GND per layout guidelines |
| 4 | VDD | Primary-side supply input (6.5–30 V); requires local 1 µF ceramic + 10 µF bulk decoupling |
| 5 | GND | Primary-side ground reference; separate from secondary-side GND for isolation integrity |
| 6 | UVLO | UVLO configuration pin - tied to GND for Si826xxBx (8 V) mode used by SI8261BCD-ASR |
| 7 | VO | Output driver high-side terminal - must be shorted to Pin 8 for full 4.0 A sink capability |
| 8 | VO | Output driver low-side terminal - shorted externally to Pin 7 to parallel internal drivers |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | VOH = VDD – 0.25 V (at 0 mA), VOL = 80 mV (at 100 mA) - ensures full logic-level compatibility with gate thresholds of SiC MOSFETs and trench IGBTs |
| Input current hysteresis | 0.34 mA - prevents chatter during slow-rising input edges in noisy industrial environments |
| Thermal derating | θJA = 110 °C/W (SOIC-8); safe operating area maintained up to 140 °C junction - enables compact heatsink-less designs in sealed enclosures |
| AEC-Q100 qualification | Grade 1 (–40 to +125 °C) - supports functional safety requirements in HEV/EV traction inverter auxiliary supplies |
| ESD robustness | HBM 4 kV, CDM 2000 V - withstands handling and board assembly without additional protection circuitry |
Applications
| Industrial Inverter Gate Drive | HEV Traction Inverter Auxiliary Supply |
|---|---|
Use Scenario: Driving 600 V IGBT half-bridge in 3-phase 15 kW solar inverter with 16 kHz PWM switching. IC Role / Device Role / Timing Role: Isolated gate driver providing 4.0 A sink current to rapidly discharge IGBT gate charge and suppress shoot-through. Use Value: 60 ns propagation delay and <25 ns pulse width distortion enable precise dead-time control at 16 kHz, reducing conduction losses by 8% vs. optocouplers. |
Use Scenario: Controlling high-side gate of 1200 V SiC MOSFET in auxiliary DC-DC converter for battery management system. IC Role / Device Role / Timing Role: Reinforced-isolation driver delivering 50 kV/µs CMTI immunity during 1000 V/ns dV/dt events on main traction bus. Use Value: 5000 VRMS isolation and AEC-Q100 Grade 1 rating ensure long-term reliability in automotive under-hood environments with wide thermal cycling. |
| Brushless Motor Control | Uninterruptible Power Supply |
Use Scenario: Driving 3-phase inverter for 5 kW HVAC compressor using field-oriented control at 12 kHz. IC Role / Device Role / Timing Role: High-speed isolated driver enabling <100 ns total propagation uncertainty across three phases for synchronized commutation. Use Value: 14× tighter part-to-part matching vs. optocouplers reduces phase current imbalance, improving torque ripple by ≤1.2%. |
Use Scenario: Gate driving 900 V IGBTs in double-conversion online UPS with 20 ms transfer time requirement. IC Role / Device Role / Timing Role: Fail-safe isolated driver with UVLO lockout (8 V) preventing partial turn-on during AC mains dropout. Use Value: 500 mV UVLO hysteresis ensures clean restart after brownouts, eliminating false triggering during 100 ms line sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HCPL-3120 | Optocoupled, 2.5 A output, 0.5 µs propagation delay, no UVLO, 3.75 kVRMS isolation | Limited to <5 kHz switching due to slower speed; lacks integrated UVLO and thermal derating data | Use only where legacy optocoupler footprint is mandatory and 16+ kHz operation is not required. |
| SIL1225CD-AS | Silicon Labs Si826x family member, same SOIC-8 package, identical pinout, but 0.6 A output (A-grade) | Lower drive strength limits use to low-power MOSFETs (<50 A IGBTs); same 5 kVRMS rating and CMTI | Select when gate charge is ≤35 nC and PCB layout rework for higher-current variants is impractical. |
Compared with HCPL-3120, SI8261BCD-ASR delivers 10× faster propagation, integrated 8 V UVLO, and 5 kVRMS isolation - enabling higher efficiency and smaller magnetics in modern 10–20 kHz inverters. Versus SIL1225CD-AS, it provides 6.7× higher sink current for direct driving of high-Qg IGBTs without external buffers.
Availability
SI8261BCD-ASR is available at Aetrix Electronics and suitable for industrial motor drives, renewable energy inverters, and HEV auxiliary power supplies requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI8261BCD-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 for communications, automotive, and industrial markets.
The Si826x product line was engineered to replace aging optocoupled gate drivers with silicon-isolated alternatives offering superior timing accuracy, reliability, and integration - specifically targeting high-efficiency motor control and power conversion systems.
FAQ
What is the UVLO threshold configuration for SI8261BCD-ASR?
The SI8261BCD-ASR uses the Si826xxBx UVLO mode, with a rising threshold of 7.5–9.4 V and falling threshold of 6.9–8.9 V. This is selected by grounding Pin 6 (UVLO), and ensures robust operation during 12 V auxiliary supply brown-outs commonly seen in industrial inverters and HEV systems. The 500 mV hysteresis prevents oscillation near the trip point.
How should the dual VO pins (7 and 8) of SI8261BCD-ASR be connected?
Both VO pins (7 and 8) of SI8261BCD-ASR must be shorted together on the PCB to achieve the full 4.0 A sink current rating. This parallel connection is required per Skyworks' datasheet Note 3 in Table 2 - failure to short them limits output to 1.2 A and risks thermal overstress under high-duty-cycle conditions.
Does SI8261BCD-ASR require external input current limiting resistors?
Yes - SI8261BCD-ASR requires an external series resistor (R1) between the controller output and Pin 1 (Anode) to limit IF to 6–30 mA. For a 3.3 V MCU GPIO, a 100 Ω resistor yields ~27 mA; for 5 V, 220 Ω yields ~18 mA. Reverse bias must be avoided: cathode must never exceed anode voltage by more than 0.3 V.
What is the maximum recommended PCB trace length between SI8261BCD-ASR and the IGBT gate?
Skyworks recommends minimizing gate loop inductance by placing SI8261BCD-ASR within 10 mm of the IGBT gate pin. Longer traces increase ringing and reduce effective CMTI - especially critical for SiC devices with >50 V/ns dV/dt. Use dedicated gate return paths and avoid shared ground pours between primary and secondary sides.
Is SI8261BCD-ASR pin-compatible with HCPL-3120?
Yes - SI8261BCD-ASR is explicitly designed as a pin-compatible, drop-in upgrade for HCPL-3120 in SOIC-8 packages. Pin mapping matches exactly: Anode/Cathode/VDD/GND/VO/VO align with Pins 1–2–4–5–7–8. No PCB redesign is needed, though decoupling capacitor values may be optimized for lower ESR.
SI8261BCD-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si826x
- Package/Case:
- 6-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):
- 60ns, 50ns
- Pulse Width Distortion (Max):
- 28ns
- Rise / Fall Time (Typ):
- 5.5ns, 8.5ns
- Current - Output High, Low:
- 500mA, 1.2A
- Current - Peak Output:
- 600mA, 4A
- Voltage - Forward (Vf) (Typ):
- 2.8V (Max)
- Current - DC Forward (If) (Max):
- 30 mA
- Voltage - Output Supply:
- 6.5V ~ 30V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-SDIP Gull Wing
- Approval Agency:
- CQC, CSA, UL, VDE
SI8261BCD-ASR FAQ
1.How can I place an order for SI8261BCD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8261BCD-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 SI8261BCD-ASR reliable?
The price and inventory of SI8261BCD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8261BCD-ASR is usually 5 days.
3.What payment methods are accepted for SI8261BCD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8261BCD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8261BCD-ASR?
SI8261BCD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8261BCD-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 SI8261BCD-ASR?
For technical support, including SI8261BCD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8261BCD-ASR requirements.
6.How does Aetrix verify that SI8261BCD-ASR is sourced from the original manufacturer or authorized distributors?
All SI8261BCD-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 SI8261BCD-ASR meets industry standards.
7.What is the process for return or replacement of SI8261BCD-ASR?
All SI8261BCD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8261BCD-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 SI8261BCD-ASR part is unused and in its original packaging.
Return procedure for SI8261BCD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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