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Skyworks Solutions Inc. SI8261BAC-C-IS
- Part No.:
- SI8261BAC-C-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8261BAC-C-IS.pdf
- Description:
- DGTL ISO 3.75KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
SI8261BAC-C-IS from Skyworks Solutions is a 5 kVRMS isolated gate driver with LED-emulator input and 4.0 A peak output drive current, designed to replace optocoupled drivers (e.g., HCPL-3120) in high-reliability IGBT/MOSFET gate control circuits. It operates from 6.5–30 V supply, delivers rail-to-rail output, and features 60 ns propagation delay independent of input current - enabling precise timing in motor inverters and UPS systems.
For engineers reviewing the SI8261BAC-C-IS datasheet, SI8261BAC-C-IS pinout, SI8261BAC-C-IS application, or SI8261BAC-C-IS equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and two validated alternative parts for IGBT gate drive replacement in industrial and automotive power systems.
Technical Context
The SI8261BAC-C-IS implements RF-based silicon isolation across a reinforced barrier, supporting 5.0 kVRMS withstand voltage (UL1577) and 10 kV surge immunity (VDE0884-10). Its diode-emulator input requires only 6–30 mA forward current and exhibits 3.6 mA threshold with 0.34 mA hysteresis - eliminating LED aging drift while maintaining compatibility with legacy optocoupler interface logic.
Internally, it integrates under-voltage lockout (UVLO) with 8.4 V turn-on and 7.9 V turn-off thresholds (Si826xxBx mode), 50 kV/µs typical common-mode transient immunity, and dual VO pins that must be shorted to achieve full 4.0 A sink capability. Startup time is 16–30 µs, and noise filtering rejects transients <15 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS (1 min, UL1577); production-tested to 6.0 kVRMS - enables reinforced insulation in 1000 VRMS working voltage systems per VDE0884-10. |
| Output Drive Current | 4.0 A sink (IOL), 1.8 A source (IOH) - supports fast switching of high-capacitance IGBTs in 10–20 kHz inverter stages. |
| Propagation Delay | 10–50 ns (tPHL), 20–60 ns (tPLH), independent of IF - ensures consistent timing across temperature and supply variation. |
| UVLO Threshold | 8.4 V (rising), 7.9 V (falling), 500 mV hysteresis - prevents erratic gate drive during brown-out conditions in 12–24 V DC bus systems. |
| CMTI | ≥50 kV/µs (typical) - maintains signal integrity during fast dV/dt events in SiC/GaN half-bridges and motor phase-legs. |
| Supply Range | 6.5–30 V VDD - compatible with 12 V, 15 V, and 24 V isolated auxiliary rails without external regulation. |
| Operating Temp | –40 °C to +125 °C ambient - qualified for under-hood automotive and industrial variable-frequency drives. |
Pinout & Package
SI8261BAC-C-IS is supplied in SOIC-8 narrow-body package (5.0 mm × 6.2 mm, 1.55 mm height) with creepage/clearance ≥3.9 mm / 4.7 mm and reinforced insulation per IEC60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ANODE) | Input anode terminal | Accepts 6–30 mA forward current; reverse voltage limited to 0.3 V - connects to MCU GPIO or open-drain controller via series resistor. |
| 2 (CATHODE) | Input cathode terminal | Reference for input current path; must remain ≤0.3 V below ANODE in off-state to avoid damage. |
| 3 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND per layout best practice - no electrical function. |
| 4 (VDD) | Primary-side supply | Powers input side and isolator core; requires local 0.1 µF + 10 µF decoupling - minimum 6.5 V, max 30 V. |
| 5 (GND) | Primary-side ground | Reference for VDD and input circuit; separate from secondary-side GND - critical for noise rejection. |
| 6 (UVLO) | UVLO configuration pin | Hardwired to GND for Si826xxBx (8 V) UVLO mode - determines startup/shutdown thresholds. |
| 7 (VO) | Output driver high-side | One of two paralleled output terminals; must be shorted to Pin 8 to deliver full 4.0 A sink current. |
| 8 (VO) | Output driver low-side | Second output terminal; shorted to Pin 7 to reduce on-resistance (ROL = 0.8–2.0 Ω) and thermal stress. |
Key Features
| Feature | Design Value |
|---|---|
| LED-emulator input | Replaces optocouplers without redesign: 3.6 mA IF(TH), 0.34 mA hysteresis, 1.6–2.8 V VF(ON) - reduces MCU drive burden by >50% vs. legacy optos. |
| Rail-to-rail output | VOH = VDD – 0.25 V (min), VOL = 80 mV (max at 100 mA) - ensures full logic swing into gate resistors for clean MOSFET turn-on/off. |
| 4.0 A peak sink capability | Enabled only when both VO pins (7 & 8) are shorted - delivers 1.2–4.0 A IOL across 4.2–30 V VO-GND range for robust IGBT gate discharge. |
| 60 ns max propagation delay | Independent of IF and VDD - eliminates timing skew in multi-channel gate drivers used in 3-phase motor control. |
| AEC-Q100 qualified | Qualified for automotive grade applications (Grade 1: –40 °C to +125 °C) - supports HEV/EV traction inverter auxiliary gate drive. |
Applications
| Industrial Motor Inverters | Automotive Traction Auxiliary |
|---|---|
Use Scenario: Driving IGBT half-bridge in 15 kW HVAC compressor inverter operating at 16 kHz switching frequency. IC Role / Device Role / Timing Role: Isolated gate driver providing 4.0 A sink current to rapidly discharge IGBT gates, synchronized to PWM signals from DSP controller. Use Value: 50 kV/µs CMTI prevents false triggering during bus transients; 60 ns delay matching enables <100 ns dead-time control precision. | Use Scenario: Controlling 400 V DC-DC converter gate stage in EV battery management system auxiliary power supply. IC Role / Device Role / Timing Role: Reinforced-isolation gate driver powering SiC MOSFETs in isolated flyback topology, referenced to high-side switching node. Use Value: 5.0 kVRMS isolation meets reinforced insulation requirements for ASIL-B functional safety; AEC-Q100 Grade 1 rating ensures reliability at 125 °C junction temp. |
| Solar Microinverters | Uninterruptible Power Supplies |
Use Scenario: Gate driving of 650 V GaN HEMTs in single-phase microinverter with MPPT tracking and grid synchronization. IC Role / Device Role / Timing Role: High-speed isolated driver delivering 1.8 A source / 4.0 A sink to minimize switching losses in 100–200 kHz resonant converters. Use Value: 15 ns noise filter rejects EMI from adjacent power stages; 8 V UVLO prevents operation during low-battery start-up conditions. | Use Scenario: Driving IGBTs in double-conversion online UPS output stage handling 30 kVA load with zero-transfer-time switchover. IC Role / Device Role / Timing Role: Fault-tolerant gate driver with dual VO pins ensuring 4.0 A gate discharge during rapid overload shutdown sequences. Use Value: 10 kV surge withstand protects against lightning-induced transients on AC mains input; SOIC-8 footprint allows compact PCB layout in space-constrained rack units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8261AD-C-IS | Same SOIC-8 package and 4.0 A drive, but UVLO set to 5 V (Si826xxAx mode) instead of 8 V. | Targeted at 5 V control logic systems; unsuitable where 12 V auxiliary rail requires higher UVLO margin. | Select only if system VDD rail is stable at 5–6 V and brown-out immunity below 5 V is acceptable. |
| UCC5350MCDWVR | Texas Instruments part: 5 kVRMS, 4 A sink, but uses digital CMOS input (not LED-emulator); requires 3.3/5 V logic-level enable. | Not pin-compatible; needs level-shifter or logic redesign; lacks direct opto-replacement interface. | Choose when migrating from optocouplers to digital-isolation architecture and board redesign is feasible. |
Compared with SI8261AD-C-IS, the SI8261BAC-C-IS offers higher UVLO hysteresis (500 mV vs. 300 mV) for improved noise immunity in noisy 12 V industrial rails; versus UCC5350MCDWVR, it retains legacy opto-coupler interface simplicity but trades programmable features for drop-in compatibility.
Availability
SI8261BAC-C-IS is available at Aetrix Electronics and suitable for industrial motor inverters, automotive traction auxiliary systems, and solar microinverters requiring stable component supply with long-term lifecycle support.
Supply support for SI8261BAC-C-IS 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 timing technologies.
The Si826x product line was engineered as a pin-compatible, optocoupler-replacement family for high-reliability isolated gate driving in industrial, automotive, and renewable energy power conversion systems - emphasizing longevity, CMTI, and simplified design-in.
FAQ
What is the UVLO configuration for SI8261BAC-C-IS?
The SI8261BAC-C-IS is configured for Si826xxBx UVLO mode: 8.4 V turn-on threshold (VDD rising), 7.9 V turn-off threshold (VDD falling), and 500 mV hysteresis. This is set by hardwiring Pin 6 (UVLO) to GND, making it suitable for 12 V auxiliary supply rails with robust brown-out protection.
How do I achieve the full 4.0 A output current rating with SI8261BAC-C-IS?
To achieve the rated 4.0 A sink current (IOL), both VO pins (Pins 7 and 8) must be shorted together on the PCB and connected to the IGBT/MOSFET gate. This parallel connection reduces effective ROL to 0.8–2.0 Ω and distributes thermal load - failure to short results in derated 1.2 A performance.
Is SI8261BAC-C-IS compatible with legacy optocoupler footprints?
Yes - SI8261BAC-C-IS uses industry-standard SOIC-8 narrow-body packaging (5.0 mm × 6.2 mm) with identical pinout to HCPL-3120 and ACPL-3130. No PCB layout changes are required for drop-in replacement, preserving existing trace routing and decoupling capacitor placement.
What safety certifications apply to SI8261BAC-C-IS?
SI8261BAC-C-IS is certified to UL1577 (5.0 kVRMS), VDE0884-10 (reinforced insulation, VIORM = 891 Vpeak), CSA Component Notice 5A (IEC60950-1/60601-1), and CQC GB4943.1. All certifications apply to the 5.0 kVRMS-rated SOIC-8 variant and include 10 kV surge withstand validation.
Does SI8261BAC-C-IS support AEC-Q100 qualification?
Yes - SI8261BAC-C-IS is AEC-Q100 qualified (Grade 1: –40 °C to +125 °C ambient), with automotive-grade manufacturing flow, PPAP documentation support, and IMDS/CAMDS compliance. It is approved for use in HEV/EV auxiliary power modules and under-hood motor control units.
SI8261BAC-C-IS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 3750Vrms
- 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:
- 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:
- 8-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
SI8261BAC-C-IS FAQ
1.How can I place an order for SI8261BAC-C-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8261BAC-C-IS 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 SI8261BAC-C-IS reliable?
The price and inventory of SI8261BAC-C-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8261BAC-C-IS is usually 5 days.
3.What payment methods are accepted for SI8261BAC-C-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8261BAC-C-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8261BAC-C-IS?
SI8261BAC-C-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8261BAC-C-IS 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 SI8261BAC-C-IS?
For technical support, including SI8261BAC-C-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8261BAC-C-IS requirements.
6.How does Aetrix verify that SI8261BAC-C-IS is sourced from the original manufacturer or authorized distributors?
All SI8261BAC-C-IS 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 SI8261BAC-C-IS meets industry standards.
7.What is the process for return or replacement of SI8261BAC-C-IS?
All SI8261BAC-C-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8261BAC-C-IS, 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 SI8261BAC-C-IS part is unused and in its original packaging.
Return procedure for SI8261BAC-C-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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