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Skyworks Solutions Inc. SI82391CD-IS3
- Part No.:
- SI82391CD-IS3
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI82391CD-IS3.pdf
- Description:
- DGT ISO 3.25KV 2CH GT DVR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
SI82391CD-IS3 from Skyworks Solutions is a dual-channel isolated gate driver IC designed for high-side/low-side MOSFET and IGBT control in power converters. It delivers 4.0 A peak output current, operates with 2.5 V–5.5 V input supply (VDDI), supports up to 5 kVRMS isolation, and features enhanced output UVLO with status feedback. It is used in solar inverters, motor drives, and isolated DC-DC supplies requiring robust noise immunity and fail-safe operation.
For engineers reviewing the SI82391CD-IS3 datasheet, SI82391CD-IS3 pinout, SI82391CD-IS3 application, or SI82391CD-IS3 equivalent, this page provides verified technical context, safety-critical timing parameters (30 ns propagation delay, 100 kV/µs CMTI), dead-time programmability (10–200 ns), fail-safe default-low outputs during VDDI loss, and SOIC-14 wide-body package compatibility - all confirmed from Skyworks' official Si8239x datasheet (Rev. 206709A, Sep 2023).
Technical Context
The SI82391CD-IS3 implements RF-based on/off keying across a silicon isolation barrier, enabling high electromagnetic immunity without optical degradation. Its dual independent inputs (VIA/VIB) drive two isolated outputs (VOA/VOB) with separate driver-side supplies (VDDA/VDDB), each monitored by dedicated UVLO circuits that force low outputs when respective supplies fall below threshold.
This variant belongs to the Si82391 subfamily: it provides Enhanced UVLO (12 V threshold), no UVLO status pin (RDY not asserted on UVLO), no delayed startup (tSTARTUP_SAFE = 0), and no deglitch filtering. It supports PWM-driven high-side/low-side configurations but does not include programmable dead time via external resistor - its dead-time setting is fixed at 10–200 ns per datasheet Table 1.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS withstand voltage - enables reinforced insulation per IEC62368-1 and UL 1577 for mains-connected systems. |
| Peak Output Current | 4.0 A - sufficient to rapidly charge/discharge high-Q gate drivers of 650 V/1200 V IGBTs and SiC MOSFETs. |
| Propagation Delay | 30 ns - ensures tight timing control in high-frequency (>100 kHz) switching topologies like LLC and phase-shifted full-bridge. |
| CMTI | 100 kV/µs - prevents false triggering in noisy motor drive or inverter environments with fast dV/dt transients. |
| Input Supply Range | VDDI = 2.5 V–5.5 V - compatible with modern low-voltage microcontrollers and FPGA I/O without level-shifting. |
| UVLO Threshold | 12 V on VDDA/VDDB - prevents partial turn-on of power devices during brown-out conditions in industrial 12 V auxiliary rails. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
SI82391CD-IS3 is housed in a RoHS-compliant SOIC-14 wide-body package (7.5 mm body width, 10.3 mm length), rated for 260 °C peak reflow per JEDEC J-STD-020. Pin assignments are validated per Skyworks datasheet Section 6 (Pin Descriptions) and Figure 32.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIA | Channel A input | TTL-compatible high-true logic input controlling VOA; referenced to GNDI. |
| VIB | Channel B input | TTL-compatible high-true logic input controlling VOB; referenced to GNDI. |
| EN | Enable control | Active-high enable; pulls both outputs low when low - critical for system-level fault shutdown. |
| VDDI | Input-side supply | 2.5 V–5.5 V bias for isolation barrier and input logic; powers internal oscillator and receiver demodulator. |
| GNDI | Input-side ground | Reference for VIA, VIB, EN, and VDDI; galvanically isolated from power-side grounds. |
| VDDA | Driver A supply | 10 V–24 V supply for high-side or low-side output stage A; enables 4 A sink/source capability. |
| VOA | Output A | Isolated gate drive output for external MOSFET/IGBT; defaults low during VDDI undervoltage. |
| GND1 | Driver A ground | Return path for VDDA and VOA; electrically isolated from GNDI and GND2. |
| VDDB | Driver B supply | 10 V–24 V supply for second output stage; independent of VDDA to support split-rail or bootstrap configurations. |
| VOB | Output B | Isolated gate drive output for complementary switch; failsafe low if VDDB or VDDI drops out. |
| GND2 | Driver B ground | Return path for VDDB and VOB; isolated from GNDI and GND1 to maintain channel separation. |
| NC | No connect | Internally unused pin; must remain unconnected per datasheet recommendation. |
| NC | No connect | Internally unused pin; must remain unconnected per datasheet recommendation. |
| NC | No connect | Internally unused pin; must remain unconnected per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced output UVLO | 12 V threshold on both VDDA and VDDB with cross-channel feedback - forces VOA/VOB low if either supply collapses, preventing shoot-through in half-bridge topologies. |
| Fail-safe default-low outputs | VOA and VOB actively driven low when VDDI is unpowered - eliminates floating gate states during power-up/down sequences. |
| High CMTI immunity | 100 kV/µs common-mode transient immunity - maintains signal integrity in high-dV/dt environments such as SiC-based inverters. |
| Independent dual-driver architecture | Separate VDDA/VDDB supplies and isolated grounds - supports asymmetric rail configurations and eliminates ground-loop coupling between channels. |
| AEC-Q100 qualified | Automotive-grade reliability (when ordered as SI82391CD-AS3) - validated for use in traction inverters and on-board chargers per Grade 1 requirements. |
Applications
| Motor Control Systems | Solar and Industrial Inverters |
|---|---|
Use Scenario: Driving high-side/low-side IGBTs in three-phase BLDC or PMSM motor drives with >10 kHz PWM frequency. IC Role / Device Role / Timing Role: Isolated gate driver providing independent, noise-immune control of upper/lower switches in each leg. Use Value: 30 ns propagation delay matching and 100 kV/µs CMTI prevent timing skew and false triggering during rapid bus transients in regenerative braking. |
Use Scenario: Controlling SiC MOSFETs in string-level solar inverters operating at 80–120 kHz with 1500 V DC input. IC Role / Device Role / Timing Role: Dual isolated driver delivering 4 A peak current to minimize switching losses while maintaining 5 kVRMS isolation for grid compliance. Use Value: Enhanced 12 V UVLO prevents partial turn-on during PV string voltage sag, avoiding shoot-through and thermal runaway. |
| Isolated DC-DC Power Supplies | Battery Management Systems |
Use Scenario: Driving synchronous rectifiers and primary-side switches in 1–3 kW isolated LLC resonant converters. IC Role / Device Role / Timing Role: High-speed isolated driver enabling precise dead-time control (10–200 ns) between complementary outputs. Use Value: Independent VDDA/VDDB supplies allow optimal gate voltage selection per device (e.g., 12 V for Si MOSFETs, 15 V for SiC), reducing conduction loss. |
Use Scenario: Controlling active balancing FETs and precharge/disconnect switches in high-voltage EV battery packs (400–800 V). IC Role / Device Role / Timing Role: Fail-safe isolated driver ensuring VOA/VOB remain low during MCU reset or 12 V auxiliary rail dropout. Use Value: Default-low behavior eliminates risk of unintended FET turn-on during power sequencing faults - critical for ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si82391BD-IS3 | 8 V output UVLO threshold instead of 12 V; otherwise identical pinout, timing, and isolation specs. | Suitable where 8 V auxiliary rail monitoring is required (e.g., legacy 12 V systems with LDO dropouts). | Select when system VDDA/VDDB nominal is 12 V but may dip to 8–9 V; retains same layout and firmware. |
| Si82391AD-IS3 | 6 V output UVLO threshold; includes UVLO status pin (RDY) and 1 ms delayed startup - differs in startup behavior and fault reporting. | Preferred in systems requiring explicit UVLO fault indication and monotonic initialization (e.g., medical power supplies). | Choose only if RDY pin feedback and safe startup sequence are mandatory; requires PCB and firmware changes. |
Compared with SI82391CD-IS3, Si82391BD-IS3 offers identical timing and isolation but lower UVLO trip point for earlier fault response, while Si82391AD-IS3 adds diagnostic capability at the cost of startup delay and pin count - making SI82391CD-IS3 optimal for cost-sensitive, high-reliability motor and inverter designs without diagnostic overhead.
Availability
SI82391CD-IS3 is available at Aetrix Electronics and suitable for motor control systems, solar inverters, and isolated DC-DC power supplies requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI82391CD-IS3 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 Si8239x family was engineered to replace optocoupled gate drivers in high-reliability power systems, delivering higher CMTI, tighter timing, longer service life, and AEC-Q100 qualification for automotive traction and charging applications.
FAQ
What is the isolation voltage rating of the SI82391CD-IS3?
The SI82391CD-IS3 provides 5 kVRMS isolation rating per UL 1577 and IEC62368-1, validated for reinforced insulation in industrial and automotive applications. This rating applies across the entire isolation barrier between input (VDDI/GNDI) and output (VDDA/GND1, VDDB/GND2) domains, supporting safe operation in 1000 V AC mains-connected equipment.
Does the SI82391CD-IS3 support bootstrap power supply configurations?
No - the SI82391CD-IS3 is not recommended for bootstrap configurations. Its Enhanced UVLO feature requires independent VDDA and VDDB supplies; using a bootstrap circuit violates the requirement for isolated, independent driver-side rails and may cause unpredictable UVLO behavior or failure to start. Use dedicated isolated DC-DC supplies for VDDA/VDDB.
What is the purpose of the EN pin on the SI82391CD-IS3?
The EN (enable) pin on the SI82391CD-IS3 is an active-high control that unconditionally forces both VOA and VOB low when pulled low, regardless of VIA/VIB states or supply conditions. It is intended for system-level fault shutdown and must be pulled down via a 100 kΩ resistor to GNDI when not actively driven - ensuring fail-safe behavior during MCU reset or communication loss.
How does the SI82391CD-IS3 behave during VDDI power loss?
When VDDI is lost or falls below UVLO threshold, the SI82391CD-IS3 enters fail-safe mode: both VOA and VOB are actively driven low, and the EN pin becomes ineffective. This prevents floating gate states in connected MOSFETs/IGBTs. The outputs remain low until VDDI recovers above the UVLO threshold and stabilizes - a behavior confirmed in Table 2.1 of the Si8239x datasheet.
Is the SI82391CD-IS3 pin-compatible with other Si8239x variants in SOIC-14 wide-body packages?
Yes - all Si8239x parts in the SOIC-14 wide-body package (e.g., SI82391AD-IS3, SI82391BD-IS3, SI82393CD-IS3) share identical pinout, footprint, and land pattern per datasheet Sections 7 and 8. However, functional differences (e.g., UVLO threshold, RDY pin presence, deglitch option) mean firmware and external circuitry must be verified for each variant before substitution.
SI82391CD-IS3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 3250Vrms
- Common Mode Transient Immunity (Min):
- 35kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 40ns, 40ns
- Pulse Width Distortion (Max):
- 5.6ns
- Rise / Fall Time (Typ):
- 12ns, 12ns (Max)
- Current - Output High, Low:
- 2A, 4A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 12.8V ~ 24V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
SI82391CD-IS3 FAQ
1.How can I place an order for SI82391CD-IS3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI82391CD-IS3 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 SI82391CD-IS3 reliable?
The price and inventory of SI82391CD-IS3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI82391CD-IS3 is usually 5 days.
3.What payment methods are accepted for SI82391CD-IS3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI82391CD-IS3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI82391CD-IS3?
SI82391CD-IS3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI82391CD-IS3 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 SI82391CD-IS3?
For technical support, including SI82391CD-IS3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI82391CD-IS3 requirements.
6.How does Aetrix verify that SI82391CD-IS3 is sourced from the original manufacturer or authorized distributors?
All SI82391CD-IS3 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 SI82391CD-IS3 meets industry standards.
7.What is the process for return or replacement of SI82391CD-IS3?
All SI82391CD-IS3 units undergo pre-shipment inspection (PSI). If there is an issue with SI82391CD-IS3, 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 SI82391CD-IS3 part is unused and in its original packaging.
Return procedure for SI82391CD-IS3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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