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Skyworks Solutions Inc. SI8221DC-D-ISR
- Part No.:
- SI8221DC-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8221DC-D-ISR.pdf
- Description:
- DGTL ISO 3.75KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
SI8221DC-D-ISR 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-ISR datasheet, SI8221DC-D-ISR pinout, SI8221DC-D-ISR application, or SI8221DC-D-ISR equivalent, this page delivers verified functional replacement data, SOIC-8 narrow-body package mapping, UVLO threshold confirmation (12.5 V), and real-world CMTI (30 kV/µs) performance for high-noise motor control and SMPS designs.
Technical Context
The SI8221DC-D-ISR implements RF-based on/off keying across a silicon isolation barrier-replacing LED/photodiode coupling with higher common-mode transient immunity 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 stages optimized for 2.5 A peak sink/source, and a 20 ns typical output rise/fall time into 200 pF. The device operates with VDD = 6.5–24 V and maintains <40 ns tPHL / <60 ns tPLH independent of input drive level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS (UL1577, 1 min); enables reinforced insulation per IEC 60950-1/61010-1 in industrial mains-connected systems |
| Peak Output Current | 2.5 A (sink/source); drives high-gate-charge IGBTs and GaN FETs without external boost stages |
| Propagation Delay | ≤60 ns (tPLH), ≤40 ns (tPHL); tight unit-to-unit matching supports multi-phase synchronous switching |
| Common-Mode Transient Immunity | 30 kV/µs; sustains reliable operation during fast-switching transients in motor drives and inverters |
| UVLO Threshold | 12.5 V (rising), 11.6–13.8 V range with 1.0 V hysteresis; prevents erratic output during brown-out conditions |
| Operating Temperature | –40 to +125 °C ambient; qualified per AEC-Q100 Grade 1 for automotive-adjacent industrial environments |
| Package | SOIC-8 narrow body (5.3 mm width); compatible with standard 0.050" pitch PCB footprints and reflow profiles |
Pinout & Package
SI8221DC-D-ISR uses an 8-pin narrow-body SOIC package (5.3 mm width, JEDEC MS-012). 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 VDD (driver supply), Pin 8 is VSS (input side ground). Input and output sides are galvanically isolated.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | ANODE | Input-side anode terminal; connects to MCU I/O or open-drain driver; requires ≥5 mA to assert high output |
| 2 | CATHODE | Input-side cathode terminal; referenced to Pin 8 (VSS); forms LED-emulator diode junction with Pin 1 |
| 3 | VO | Output driver terminal; sources/sinks up to 2.5 A; logic-high when input diode is forward-biased |
| 4 | VSS | Driver-side ground reference; must be connected to power-stage ground; isolated from Pin 8 |
| 5 | NC | No connect; internal die pad not bonded; must remain unconnected on PCB |
| 6 | NC | No connect; internal die pad not bonded; must remain unconnected on PCB |
| 7 | VDD | Driver supply input; accepts 6.5–24 V; powers output stage and internal UVLO circuitry |
| 8 | VSS | Input-side ground reference; ties to ANODE/CATHODE return; galvanically isolated from Pin 4 |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging drift and temperature-dependent timing variation; ensures stable 60 ns max tPLH over full temperature range |
| Input current efficiency | Operates at 5–20 mA IF (vs. 10–25 mA for HCPL-3120); reduces MCU GPIO loading and enables direct 3.3 V/5 V logic interface |
| Tight part-to-part matching | 14× tighter propagation delay distribution than optocoupled equivalents; critical for parallel IGBT gate driving |
| Reinforced safety certification | UL1577 (5 kVRMS), VDE IEC 60747-5-5, CSA 61010-1/60950-1, CQC GB4943.1 - validated for industrial and medical equipment |
| Robust UVLO with hysteresis | 12.5 V turn-on threshold with 1.0 V hysteresis prevents oscillation during supply ramp-up/down in SMPS and motor controllers |
Applications
| Industrial Motor Drives | Switch-Mode Power Supplies |
|---|---|
Use Scenario: Driving high-side IGBTs in 3-phase VFDs operating at 16 kHz PWM with >1000 V bus voltage. IC Role / Device Role / Timing Role: Isolated gate driver providing 2.5 A peak current to charge/discharge IGBT gates while rejecting common-mode noise from power-stage switching. Use Value: 30 kV/µs CMTI prevents false triggering during dv/dt events; 60 ns max tPLH enables precise phase alignment across multiple channels. |
Use Scenario: Half-bridge LLC resonant converter with 400 V input and 12 V/20 A output in telecom rectifiers. IC Role / Device Role / Timing Role: High-speed isolated driver controlling synchronous rectifier MOSFETs and primary-side switches with matched propagation delay. Use Value: 2.5 A output current eliminates need for external gate buffers; 5.0 kVRMS isolation meets IEC 62368-1 reinforced insulation requirements. |
| Uninterruptible Power Systems | Inverters for Renewable Energy |
Use Scenario: Bidirectional DC-AC inverter in online UPS handling 10 kVA load with battery backup switchover. IC Role / Device Role / Timing Role: Dual-channel isolated driver (paired devices) managing IGBT half-bridge switching with fault feedback isolation. Use Value: AEC-Q100 qualification ensures reliability under thermal cycling; –40 to +125 °C rating supports fanless enclosure designs. |
Use Scenario: Solar string inverter converting 600–1000 V DC to 230 V AC with transformerless topology. IC Role / Device Role / Timing Role: Reinforced-isolation gate driver enabling high-efficiency, high-voltage DC-link switching with leakage current compliance. Use Value: 5.0 kVRMS isolation and 891 Vpeak VIORM satisfy IEC 62109-1 for PV inverters; SOIC-8 footprint simplifies high-density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8221AD-D-ISR | Same SOIC-8 package and 2.5 A output, but 3.75 kVRMS isolation rating and 10 V UVLO threshold | Suitable for lower-isolation industrial controls (e.g., PLC I/O modules) where 5 kVRMS is not mandated | Select when system-level safety standards require only 3.75 kVRMS and 10 V UVLO aligns with existing supply rails |
| HCPL-3120-000E | Optocoupled 2.5 A driver; 5 kVRMS isolation but 200 ns max tPLH, 15 kV/µs CMTI, and LED aging sensitivity | Legacy drop-in replacement in cost-sensitive, low-frequency (<20 kHz) motor drives with relaxed timing demands | Choose only for backward compatibility in field-replacement scenarios; avoid for new designs requiring precision timing or long-term stability |
Compared with Si8221AD-D-ISR, SI8221DC-D-ISR provides higher isolation (5.0 vs. 3.75 kVRMS) and higher UVLO (12.5 vs. 10 V), making it suitable for mains-connected UPS and solar inverters. Versus HCPL-3120-000E, it delivers 3.3× faster propagation, 2× higher CMTI, and no LED degradation-critical for high-reliability renewable energy systems.
Availability
SI8221DC-D-ISR is available at Aetrix Electronics and suitable for industrial motor drives, switch-mode power supplies, uninterruptible power systems, and renewable-energy inverters requiring stable component supply, long-lifecycle support, and certified reinforced isolation.
Supply support for SI8221DC-D-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 for high-performance systems.
The Si822x family was designed specifically as a functional upgrade path from legacy optocoupled gate drivers-delivering superior timing accuracy, isolation robustness, and thermal stability for next-generation power conversion and motor control applications.
FAQ
What is the isolation voltage rating of SI8221DC-D-ISR?
The SI8221DC-D-ISR is rated for 5.0 kVRMS isolation per UL1577 (1 minute test), with production-tested withstand voltage of 6.0 kVRMS. This qualifies it for reinforced insulation in IEC 60950-1 and IEC 62368-1 applications up to 600 VRMS working voltage, including industrial inverters and UPS systems.
Does SI8221DC-D-ISR support direct connection to 3.3 V microcontrollers?
Yes. SI8221DC-D-ISR's LED-emulator input requires only 5–20 mA forward current and operates with VF = 1.7–2.5 V, enabling direct connection to 3.3 V or 5 V MCU GPIO pins without series resistors exceeding 330 Ω. Its input hysteresis (0.5 mA) further improves noise immunity in noisy digital environments.
How does the UVLO behavior of SI8221DC-D-ISR differ from HCPL-3120?
SI8221DC-D-ISR features a programmable 12.5 V UVLO threshold with 1.0 V hysteresis (11.6–13.8 V range), whereas HCPL-3120 has no UVLO protection. This prevents output glitches during brown-out conditions in SMPS and motor drives-ensuring VO remains low until VDD stabilizes above the safe operating threshold.
Can SI8221DC-D-ISR replace HCPL-3120 in existing PCB layouts?
Yes-SI8221DC-D-ISR uses the same SOIC-8 narrow-body package (5.3 mm width) and pinout as HCPL-3120, enabling drop-in replacement without PCB modification. However, verify that VDD is limited to ≤24 V and that input drive current stays within 5–20 mA to maintain optimal timing and reliability.
What is the maximum switching frequency supported by SI8221DC-D-ISR?
SI8221DC-D-ISR supports continuous operation up to 2 MHz, with 20 ns typical output rise/fall time into 200 pF. At 100 kHz PWM, its 60 ns max propagation delay introduces <0.006% timing error-making it suitable for high-resolution motor control and resonant LLC converters.
SI8221DC-D-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):
- 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-ISR FAQ
1.How can I place an order for SI8221DC-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8221DC-D-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 SI8221DC-D-ISR reliable?
The price and inventory of SI8221DC-D-ISR 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-ISR is usually 5 days.
3.What payment methods are accepted for SI8221DC-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8221DC-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8221DC-D-ISR?
SI8221DC-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8221DC-D-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 SI8221DC-D-ISR?
For technical support, including SI8221DC-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8221DC-D-ISR requirements.
6.How does Aetrix verify that SI8221DC-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8221DC-D-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 SI8221DC-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8221DC-D-ISR?
All SI8221DC-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8221DC-D-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 SI8221DC-D-ISR part is unused and in its original packaging.
Return procedure for SI8221DC-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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