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Skyworks Solutions Inc. SI8221DC-D-IS
- Part No.:
- SI8221DC-D-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8221DC-D-IS.pdf
- Description:
- DGTL ISO 3.75KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,047
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Product details
Overview
SI8221DC-D-IS from Skyworks Solutions is a 2.5 A peak-output isolated gate driver with opto-emulator input, 5.0 kVRMS reinforced isolation (UL1577), 60 ns max propagation delay, and –40 to +125 °C operation. It replaces HCPL-3120/HCPL-0302 in IGBT/MOSFET gate drive circuits for industrial inverters and UPS systems.
For engineers reviewing the SI8221DC-D-IS datasheet, SI8221DC-D-IS pinout, SI8221DC-D-IS application, or SI8221DC-D-IS equivalent, this page delivers verified functional replacement data, SOIC-8 narrow-body package details, UVLO thresholds (12.5 V), CMTI (30 kV/µs), and real-world design constraints for high-reliability power conversion.
Technical Context
The SI8221DC-D-IS implements RF-based on/off keying across a silicon isolation barrier-replacing LED/photodiode coupling with higher common-mode transient immunity (30 kV/µs) and temperature-stable timing. Its input emulates an LED but requires only 5–20 mA forward current, enabling direct MCU/FPGA I/O drive without external buffers.
Internally, it integrates under-voltage lockout with 12.5 V rising threshold (±1.4 V hysteresis), output driver with 2.7 Ω source / 1.0 Ω sink resistance, and logic-level output compatible with 6.5–24 V VDD. Propagation delay (tPLH ≤60 ns, tPHL ≤40 ns) is independent of input current, ensuring consistent switching across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS (1 min, UL1577); enables reinforced insulation per IEC 60950-1/61010-1 in 600 VRMS working voltage systems |
| Peak Output Current | 2.5 A (10 µs pulse, 0.2% duty); drives high-gate-charge IGBTs and SiC MOSFETs without external boost stages |
| Propagation Delay | tPLH ≤60 ns, tPHL ≤40 ns (CL = 200 pF); supports >10 MHz PWM switching with tight channel-to-channel matching |
| VDD Operating Range | 6.5 V to 24 V; compatible with standard 12 V/15 V industrial rails and eliminates need for auxiliary LDOs |
| UVLO Threshold | 12.5 V (rising), 11.6 V (falling), 1.0 V hysteresis; prevents erratic gate drive during brown-out conditions in motor control |
| CMTI | 30 kV/µs minimum; sustains reliable operation in noisy inverter half-bridges with fast dV/dt transients |
| Operating Temperature | –40 °C to +125 °C ambient; qualified per AEC-Q100 Grade 1 for industrial and automotive traction inverter use |
Pinout & Package
SI8221DC-D-IS uses an 8-pin narrow-body SOIC package (SOIC-8 NB) with creepage/clearance ≥4.01 mm / 4.9 mm and 5.0 kVRMS isolation rating. Pin 1 is ANODE, Pin 2 is CATHODE, Pin 3 is VO (output), Pin 4 is VSS (driver ground), Pin 5 is NC, Pin 6 is NC, Pin 7 is NC, Pin 8 is VDD (driver supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ANODE) | Input anode terminal | Accepts 5–20 mA forward current; emulates LED anode-connects to MCU I/O or open-drain driver |
| 2 (CATHODE) | Input cathode terminal | Serves as input return; must be tied to system ground or low-side reference when driving from active-low sources |
| 3 (VO) | Output driver terminal | 2.5 A peak source/sink gate drive output; directly connects to IGBT/MOSFET gate with minimal external components |
| 4 (VSS) | Driver-side ground reference | Return path for VO and internal circuitry; must be low-inductance connection to power stage ground |
| 5–7 (NC) | No-connect terminals | Not internally bonded; must remain unconnected per datasheet to avoid isolation degradation |
| 8 (VDD) | Driver supply input | 6.5–24 V rail; requires local 0.1 µF + 10 µF decoupling adjacent to pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging drift and temperature-dependent timing variation-enables ±5 ns unit-to-unit propagation delay matching over full temperature range |
| Input LED emulator | Accepts standard opto-driver interface circuits while reducing required drive current by 50% vs HCPL-3120-lowers MCU GPIO loading and power consumption |
| High CMTI (30 kV/µs) | Prevents false triggering during 1500 V common-mode transients in half-bridge configurations-critical for SiC/GaN inverter reliability |
| UVLO with hysteresis | 12.5 V turn-on / 11.6 V turn-off ensures clean gate drive enable/disable sequencing during power-up/down-avoids shoot-through in bridge legs |
| AEC-Q100 qualification | Validated for automotive-grade thermal cycling, ESD, and HTOL-supports use in EV onboard chargers and traction inverter auxiliary supplies |
Applications
| Industrial Motor Drives | Uninterruptible Power Supplies |
|---|---|
|
Use Scenario: Driving IGBT half-bridge gates in 3-phase VFDs with 1 kHz–20 kHz PWM and 1500 V bus voltage. IC Role / Device Role / Timing Role: Isolated gate driver providing level-shifted, high-current turn-on/turn-off signals with precise timing alignment between high-side and low-side switches. Use Value: 60 ns max tPLH/tPHL and 30 kV/µs CMTI prevent cross-conduction and ensure robust commutation under fast dV/dt bus transients. |
Use Scenario: Controlling MOSFETs in DC-AC inverter stage of online UPS systems requiring <100 µs switchover and high efficiency at partial load. IC Role / Device Role / Timing Role: Functional replacement for HCPL-3120 delivering 2.5 A peak gate drive with stable propagation delay across –40 to +125 °C ambient. Use Value: 5.0 kVRMS isolation and AEC-Q100 qualification support reinforced insulation requirements and long-term reliability in 24/7 backup power applications. |
| Switch-Mode Power Supplies | Inverters for Renewable Energy |
|
Use Scenario: Gate driving of primary-side GaN HEMTs in 1–3 kW telecom rectifiers operating at 300–500 kHz with tight regulation. IC Role / Device Role / Timing Role: High-speed isolated driver enabling fast, low-loss switching with minimal dead-time uncertainty due to current-independent propagation delay. Use Value: 20 ns output rise/fall time (CL = 200 pF) reduces switching losses; 2.7 Ω source resistance ensures strong gate pull-up for GaN devices. |
Use Scenario: Controlling string-level IGBTs in solar PV inverters exposed to wide ambient swings (–25 to +60 °C) and high humidity. IC Role / Device Role / Timing Role: Isolated gate driver with 125 °C max junction temperature rating and moisture-resistant SOIC-8 NB package for outdoor-rated inverters. Use Value: RoHS-compliant narrow-body SOIC package meets IPC/JEDEC MSL3 handling; 5.0 kVRMS isolation satisfies IEC 62109 safety for photovoltaic systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8220DC-D-IS | Same SOIC-8 NB package and pinout; 0.5 A peak output (vs 2.5 A), lower CMTI (20 kV/µs), identical 5.0 kVRMS isolation and UVLO thresholds | Targeted at low-power SMPS and auxiliary supplies where gate charge is <50 nC; not suitable for high-current IGBTs | Select when gate drive strength requirement is ≤0.5 A and cost optimization is prioritized over drive capability |
| HCPL-3120-000E | Optocoupler-based; 2.5 A peak output but 500 ns typical propagation delay, no integrated UVLO, 3.75 kVRMS isolation, wider SOIC-8 WB package | Legacy designs requiring drop-in opto compatibility; lacks CMTI spec and suffers from LED aging-induced timing drift | Use only for backward-compatible replacements where RF-based isolation is not required and timing stability is non-critical |
Compared with Si8220DC-D-IS, SI8221DC-D-IS delivers 5× higher peak output current and superior CMTI for demanding inverter applications; compared with HCPL-3120-000E, it offers 8× faster propagation, integrated UVLO, and silicon-isolation reliability-making it the preferred upgrade for new designs targeting >10 kHz switching and long service life.
Availability
SI8221DC-D-IS is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, and renewable energy inverters requiring stable component supply, long-lifecycle assurance, and certified 5.0 kVRMS isolation.
Supply support for SI8221DC-D-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, timing, and isolation technologies.
The Si822x family was engineered to replace aging optocoupled gate drivers with silicon-isolated alternatives offering higher speed, tighter timing, and enhanced reliability for industrial power conversion and automotive electrification.
FAQ
What is the isolation voltage rating of the SI8221DC-D-IS?
The SI8221DC-D-IS is rated for 5.0 kVRMS isolation per UL1577 (1 minute test). It is production-tested to 6.0 kVRMS for 1 second and certified for reinforced insulation up to 600 VRMS working voltage per IEC 60950-1 and IEC 61010-1. This rating applies specifically to the SI8221DC-D-IS variant in the narrow-body SOIC-8 package.
Does the SI8221DC-D-IS require an external current-limiting resistor on the input side?
Yes-the SI8221DC-D-IS input emulates an LED and requires an external series resistor to limit forward current to 5–20 mA. For a 3.3 V MCU I/O driving ANODE with CATHODE grounded, a 150 Ω resistor sets IF ≈ 15 mA. The resistor value must be recalculated for different supply voltages to stay within absolute maximum ratings.
Can the SI8221DC-D-IS drive SiC MOSFETs directly?
Yes-the SI8221DC-D-IS delivers 2.5 A peak source/sink current and 20 ns output rise/fall times (CL = 200 pF), making it suitable for direct gate drive of medium-power SiC MOSFETs with Qg < 100 nC. Its 2.7 Ω source resistance provides strong turn-on drive, while 1.0 Ω sink resistance ensures fast turn-off critical for SiC switching.
What is the UVLO behavior of the SI8221DC-D-IS during power-up?
During power-up, the SI8221DC-D-IS holds VO low until VDD rises above 12.4 V (min) and remains above that threshold for ≥40 µs (tSTART). Once enabled, VO goes high when IF exceeds 5 mA. If VDD subsequently falls below 11.6 V (min), VO is forced low again-ensuring safe gate drive sequencing in unstable power environments.
Is the SI8221DC-D-IS pin-compatible with HCPL-3120?
No-the SI8221DC-D-IS uses an 8-pin narrow-body SOIC package with pin 1 = ANODE, pin 2 = CATHODE, pin 3 = VO, pin 4 = VSS, pins 5–7 = NC, pin 8 = VDD. The HCPL-3120 uses an 8-pin wide-body SOIC with different pinout (pin 1 = ANODE, pin 2 = CATHODE, pin 3 = NC, pin 4 = VCC, pin 5 = GND, pin 6 = OUT, pin 7 = NC, pin 8 = NC). PCB layout changes are required for replacement.
SI8221DC-D-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):
- 30kV/µs (Typ)
- Propagation Delay tpLH / tpHL (Max):
- 60ns, 40ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 30ns, 30ns (Max)
- Current - Output High, Low:
- 300mA, 500mA
- Current - Peak Output:
- 500mA
- Voltage - Forward (Vf) (Typ):
- 2.5V (Max)
- Current - DC Forward (If) (Max):
- 30 mA
- Voltage - Output Supply:
- 14.8V ~ 24V
- 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
SI8221DC-D-IS FAQ
1.How can I place an order for SI8221DC-D-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8221DC-D-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 SI8221DC-D-IS reliable?
The price and inventory of SI8221DC-D-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8221DC-D-IS is usually 5 days.
3.What payment methods are accepted for SI8221DC-D-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8221DC-D-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8221DC-D-IS?
SI8221DC-D-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8221DC-D-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 SI8221DC-D-IS?
For technical support, including SI8221DC-D-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8221DC-D-IS requirements.
6.How does Aetrix verify that SI8221DC-D-IS is sourced from the original manufacturer or authorized distributors?
All SI8221DC-D-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 SI8221DC-D-IS meets industry standards.
7.What is the process for return or replacement of SI8221DC-D-IS?
All SI8221DC-D-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8221DC-D-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 SI8221DC-D-IS part is unused and in its original packaging.
Return procedure for SI8221DC-D-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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