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Skyworks Solutions Inc. SI8261ACC-C-ISR
- Part No.:
- SI8261ACC-C-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8261ACC-C-ISR.pdf
- Description:
- DGTL ISO 3.75KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
SI8261ACC-C-ISR from Skyworks Solutions is a 5 kVRMS isolated gate driver with LED-emulator input, delivering 4.0 A peak output current in SOIC-8 narrow-body package. It drives IGBTs and power MOSFETs in high-noise motor inverters and industrial power supplies, featuring 60 ns propagation delay, 50 kV/µs CMTI, and UVLO threshold of 12 V (Si8261C variant).
For engineers reviewing the SI8261ACC-C-ISR datasheet, SI8261ACC-C-ISR pinout, SI8261ACC-C-ISR application, or SI8261ACC-C-ISR equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, automotive-grade AEC-Q100 qualification, safety certifications (UL 1577, VDE 0884-10), and drop-in replacement guidance for optocoupled drivers like HCPL-3120.
Technical Context
The SI8261ACC-C-ISR implements RF-based silicon isolation instead of optical coupling, enabling stable propagation delay independent of input drive current and eliminating LED aging effects. Its diode-emulator input requires only 6 mA typical forward current and exhibits 1.6–2.8 V forward voltage, matching legacy optocoupler interface logic while reducing power consumption.
This device belongs to the Si826x family's "C" UVLO variant (12 V turn-on), uses dual VO pins shorted for 4.0 A sink capability, and integrates noise filtering with 15 ns pulse rejection. It operates across –40 °C to +125 °C ambient and supports reinforced insulation up to 1414 VPEAK per VDE 0884-10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS (1 min UL 1577); enables reinforced insulation in 1000 VRMS mains systems |
| Peak Output Current | 4.0 A (sink), achieved by shorting both VO pins - mandatory for full rating compliance |
| Propagation Delay | 20–60 ns (tPLH/tPHL, CL = 200 pF); independent of IF, ensuring timing consistency across temperature |
| UVLO Threshold | 10.5–13.5 V (rising), 9.4–12.2 V (falling); hysteresis of 1.3 V prevents chatter during brownout recovery |
| CMTI | 35–50 kV/µs (typical); sustains reliable switching under fast transients in IGBT half-bridges |
| Supply Range | 6.5–30 V VDD; supports direct connection to 12 V or 24 V industrial rails without regulation |
| Operating Temp | –40 to +125 °C ambient; qualified per AEC-Q100 Grade 1 for automotive traction inverter auxiliary drives |
Pinout & Package
SI8261ACC-C-ISR is housed in an 8-pin narrow-body SOIC package (5.3 mm × 6.2 mm, 1.75 mm height) with creepage/clearance ≥3.9 mm / 4.7 mm and reinforced insulation per VDE 0884-10.
| 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 return path |
| 3 | NC | No internal connection; must remain unconnected per datasheet |
| 4 | VDD | Isolated-side supply rail; decouple with 1 µF ceramic + 10 µF bulk capacitor near pin |
| 5 | GND | Isolated-side ground reference; separate from input-side GND; critical for CMTI performance |
| 6 | UVLO | UVLO threshold selection pin; tied to VDD for "C" mode (12 V); open for "A" (5 V), grounded for "B" (8 V) |
| 7 | VO | Output driver source/sink terminal; must be shorted to Pin 8 for 4.0 A operation |
| 8 | VO | Second output terminal; electrically identical to Pin 7; shorting ensures current sharing and thermal balance |
Key Features
| Feature | Design Value |
|---|---|
| LED-emulator input | Replaces optocouplers without redesign: matches 1.6–2.8 V VF, 6 mA IF(ON), and 0.3 V reverse limit |
| Rail-to-rail output | VOH = VDD – 0.25 V (IOUT = –100 mA); VOL = 80 mV (IOUT = 100 mA); minimizes gate drive loss |
| High CMTI | 50 kV/µs typical common-mode transient immunity; prevents false triggering in high-dV/dt IGBT bridges |
| UVLO with hysteresis | 1.3 V hysteresis on 12 V threshold prevents oscillation during supply ramp-up/down in noisy environments |
| AEC-Q100 qualified | Grade 1 (–40 to +125 °C) qualification confirms suitability for automotive inverter auxiliary control and EV charging modules |
| Surge withstand | 10 kV surge protection (IEC 60065); survives lightning-induced transients in industrial UPS and solar inverters |
Applications
| Industrial Motor Inverters | Automotive Traction Auxiliary Drives |
|---|---|
Use Scenario: Driving 600 V IGBT half-bridge in HVAC compressor inverters with 15 kHz PWM switching. IC Role / Device Role / Timing Role: Isolated gate driver providing level-shifted, noise-immune turn-on/turn-off signals to high-side and low-side switches. Use Value: 50 kV/µs CMTI prevents shoot-through during bus transients; 4.0 A peak current ensures fast IGBT gate charge/discharge at 15 kHz. |
Use Scenario: Controlling 48 V BLDC motors in electric power steering (EPS) and coolant pumps. IC Role / Device Role / Timing Role: AEC-Q100 qualified isolated driver delivering robust gate control in vibration-prone, thermally demanding chassis locations. Use Value: –40 to +125 °C operation and 12 V UVLO prevent latch-up during cold cranking or under-hood thermal stress. |
| Solar Microinverters | Industrial UPS Systems |
Use Scenario: Gate driving SiC MOSFETs in single-phase microinverter DC-AC stage with >100 kHz switching. IC Role / Device Role / Timing Role: High-speed isolated driver enabling precise dead-time control and minimizing switching losses in SiC topologies. Use Value: 60 ns max propagation delay and <28 ns pulse width distortion ensure tight timing margins at high frequencies. |
Use Scenario: Isolating gate signals in three-phase double-conversion UPS where line surges exceed 6 kV. IC Role / Device Role / Timing Role: Reinforced-isolation driver protecting control logic from high-energy transients on AC input and battery bus. Use Value: 10 kV surge withstand and 5 kVRMS isolation meet IEC 62040-1 for Class I UPS safety 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 |
|---|---|---|---|
| Si8261BCD-C-ISR | Same SOIC-8 package and 4.0 A drive, but 8 V UVLO threshold (Si8261B variant); lower turn-on voltage | Better suited for 12 V rail systems with marginal dropout; less margin against brownout than SI8261ACC-C-ISR's 12 V UVLO | Select when system VDD dips below 10.5 V during transients and 8 V UVLO provides more robust startup |
| HCPL-3120-000E | Optocoupled 2.5 A driver in DIP8; no UVLO hysteresis; 100 ns propagation delay; 15 kV/µs CMTI | Limited lifetime due to LED degradation; higher input current (16 mA); unsuitable for AEC-Q100 designs | Only for legacy opto-replacement where cost is primary constraint and long-term reliability is secondary |
Compared with Si8261BCD-C-ISR, SI8261ACC-C-ISR offers higher UVLO threshold for improved brownout resilience in 24 V industrial rails; compared with HCPL-3120-000E, it delivers 3× faster propagation, 3× higher CMTI, and eliminates LED wear-out failure mechanisms.
Availability
SI8261ACC-C-ISR is available at Aetrix Electronics and suitable for industrial motor inverters, automotive auxiliary drives, and solar microinverters requiring stable component supply, AEC-Q100 compliance, and reinforced isolation certification.
Supply support for SI8261ACC-C-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 Si826x product line was designed specifically to replace aging optocoupled gate drivers in high-reliability power conversion systems, combining silicon isolation robustness with drop-in compatibility for rapid design migration.
FAQ
What is the UVLO configuration of SI8261ACC-C-ISR?
The "C" suffix in SI8261ACC-C-ISR specifies the 12 V UVLO variant. Pin 6 (UVLO) is internally tied to VDD during manufacturing, setting VDDUV+ to 10.5–13.5 V and hysteresis to 1.3 V. This configuration prevents false turn-on during 24 V rail sag and ensures clean startup in automotive and industrial environments where SI8261ACC-C-ISR operates.
Can SI8261ACC-C-ISR drive 4.0 A without external components?
Yes - SI8261ACC-C-ISR delivers 4.0 A peak sink current natively, but only when both VO pins (7 and 8) are shorted together on the PCB. The datasheet explicitly requires this connection to achieve full 4.0 A compliance; using only one VO pin limits output to 1.2 A. This design feature is integral to SI8261ACC-C-ISR's architecture and is validated in Table 2.
Is SI8261ACC-C-ISR certified for reinforced insulation?
Yes - SI8261ACC-C-ISR carries VDE 0884-10 certification for reinforced insulation (VIORM = 1140 VPEAK in SDIP6, 891 VPEAK in SOIC-8), UL 1577 recognition (5000 VRMS), and CSA Component Notice 5A (IEC 60950-1/60601-1). These certifications apply directly to SI8261ACC-C-ISR's SOIC-8 package and are production-tested per regulatory protocols.
How does SI8261ACC-C-ISR differ from optocoupled alternatives like HCPL-3120?
SI8261ACC-C-ISR replaces HCPL-3120 with RF-based silicon isolation, eliminating LED aging and offering 60 ns vs. 100 ns propagation delay, 50 kV/µs vs. 15 kV/µs CMTI, and 10× lower FIT rate. Unlike HCPL-3120, SI8261ACC-C-ISR features programmable UVLO, rail-to-rail output, and AEC-Q100 qualification - all in pin-compatible SOIC-8 packaging.
What layout practices maximize CMTI performance for SI8261ACC-C-ISR?
To maximize CMTI, route SI8261ACC-C-ISR's input traces (Pins 1–2) and output traces (Pins 7–8) orthogonally, place 1 µF + 10 µF VDD decoupling capacitors within 2 mm of Pins 4 and 5, and use split ground planes separating input and isolated domains. These practices are validated in Si826x layout guidelines and directly impact SI8261ACC-C-ISR's 50 kV/µs CMTI rating.
SI8261ACC-C-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 400mA, 600mA
- Current - Peak Output:
- 600mA
- Voltage - Forward (Vf) (Typ):
- 2.8V (Max)
- Current - DC Forward (If) (Max):
- 30 mA
- Voltage - Output Supply:
- 13.5V ~ 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
SI8261ACC-C-ISR FAQ
1.How can I place an order for SI8261ACC-C-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8261ACC-C-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 SI8261ACC-C-ISR reliable?
The price and inventory of SI8261ACC-C-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8261ACC-C-ISR is usually 5 days.
3.What payment methods are accepted for SI8261ACC-C-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8261ACC-C-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8261ACC-C-ISR?
SI8261ACC-C-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8261ACC-C-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 SI8261ACC-C-ISR?
For technical support, including SI8261ACC-C-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8261ACC-C-ISR requirements.
6.How does Aetrix verify that SI8261ACC-C-ISR is sourced from the original manufacturer or authorized distributors?
All SI8261ACC-C-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 SI8261ACC-C-ISR meets industry standards.
7.What is the process for return or replacement of SI8261ACC-C-ISR?
All SI8261ACC-C-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8261ACC-C-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 SI8261ACC-C-ISR part is unused and in its original packaging.
Return procedure for SI8261ACC-C-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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