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Skyworks Solutions Inc. SI82391BD-IS3
- Part No.:
- SI82391BD-IS3
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI82391BD-IS3.pdf
- Description:
- DGT ISO 3.25KV 2CH GT DVR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
SI82391BD-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 industrial inverters, motor drives, and isolated DC-DC supplies requiring robust noise immunity and fail-safe operation.
For engineers reviewing the SI82391BD-IS3 datasheet, SI82391BD-IS3 pinout, SI82391BD-IS3 application, or SI82391BD-IS3 equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, safety-critical feature implementation details, and validated alternative options for high-reliability power stage design.
Technical Context
The SI82391BD-IS3 implements RF-based silicon isolation with on/off keying modulation across a reinforced barrier, enabling CMTI ≥100 kV/µs and eliminating startup initialization requirements. Its dual independent inputs (VIA/VIB) drive isolated outputs (VOA/VOB) with programmable dead time (10–200 ns) and deglitch filtering.
It integrates independent UVLO monitoring per driver side (VDDA/VDDB), with fault feedback to the input side that forces both outputs low upon either supply undervoltage - a behavior confirmed for Si82391-series devices and critical for transformer-coupled topologies. The EN pin (active-high) provides hardware-level shutdown with fail-safe default-low behavior during VDDI power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS withstand voltage - enables reinforced insulation per IEC62368-1 and UL 1577 for primary-secondary safety separation in AC/DC and DC/DC systems. |
| Peak Output Current | 4.0 A - sufficient to directly drive high-Qg MOSFETs/IGBTs without external buffers in 1–100 kHz switching applications. |
| Input Supply Range (VDDI) | 2.5 V–5.5 V - compatible with modern low-voltage microcontrollers and logic families, reducing level-shifting complexity. |
| Propagation Delay | 30 ns - ensures tight timing control in high-frequency half-bridge and full-bridge topologies with minimal skew between channels. |
| UVLO Threshold (VDDA/VDDB) | 8 V (typical) - prevents erratic switching during brown-out conditions in 12 V or 15 V gate drive rails. |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and automotive under-hood environments without derating. |
| Package | SOIC-14 wide body - provides 8.3 mm creepage/clearance, RoHS-compliant, JEDEC MS-012 compliant footprint. |
Pinout & Package
SI82391BD-IS3 is housed in a 14-pin wide-body SOIC package (JEDEC MS-012), offering 8.3 mm creepage and clearance for reinforced isolation. Pin numbering follows standard SOIC convention (pin 1 = dot-marked corner).
| 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 deasserted, overriding VIA/VIB states. |
| VDDI | Input-side supply | 2.5–5.5 V power for isolation barrier and input logic; UVLO threshold at ~2.3 V (VDDIUV–). |
| GNDI | Input-side ground | Reference for VIA, VIB, EN, and VDDI; galvanically isolated from driver-side grounds. |
| VDDA | Driver A supply | 10–24 V gate drive rail for high-side or low-side switch; monitored for UVLO (8 V threshold). |
| VOA | Output A | 4.0 A capable push-pull output; defaults low during VDDI power-down or VDDA UVLO. |
| GND1 | Driver A ground | Return path for VDDA and VOA; isolated from GNDI and GND2. |
| VDDB | Driver B supply | 10–24 V gate drive rail for complementary switch; independently monitored for UVLO. |
| VOB | Output B | 4.0 A capable push-pull output; mirrors VOA's fail-safe behavior under UVLO or EN deassertion. |
| GND2 | Driver B ground | Return path for VDDB and VOB; isolated from GNDI and GND1. |
| NC | No connect | Pins 12 and 13 are internally unused; must remain unconnected per datasheet. |
| NC | No connect | Pins 12 and 13 are internally unused; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced UVLO with status feedback | When VDDA or VDDB falls below 8 V, corresponding output is forced low *and* fault signal is fed back across isolation barrier to disable both outputs - preventing transformer flux walk in forward/flyback converters. |
| Programmable dead time | 10–200 ns range via external resistor - eliminates shoot-through risk in half-bridge configurations without requiring controller-side delay logic. |
| Fail-safe default-low outputs | VOA and VOB automatically go low if VDDI is unpowered or EN is deasserted - ensuring power stage remains off during initialization or fault conditions. |
| 1 ms safe delayed startup | Guaranteed monotonic output behavior after VDDI valid; allows system MCU to complete configuration before gate signals become active. |
| RF-based silicon isolation | 100 kV/µs CMTI and no LED aging - delivers stable timing performance over temperature, lifetime, and EMI stress vs. optocouplers. |
Applications
| Industrial Inverters | Solar MPPT Converters |
|---|---|
Use Scenario: Driving high-voltage IGBTs in three-phase 600 V DC bus inverters for HVAC and industrial pumps. IC Role / Device Role / Timing Role: Dual isolated gate driver providing independent high-side/low-side control with synchronized dead-time insertion and UVLO fault coordination. Use Value: Prevents shoot-through during transient load steps by enforcing 10–200 ns programmable dead time and disabling both outputs on single-rail undervoltage. |
Use Scenario: Controlling synchronous rectifiers and boost switches in string-level solar inverters operating at 1000 V DC input. IC Role / Device Role / Timing Role: Isolated driver enabling fast 30 ns propagation with 5 kVRMS barrier to meet IEC 62109 insulation requirements. Use Value: Maintains >100 kV/µs CMTI under PV array EMI, ensuring reliable gate control without false triggering in noisy outdoor environments. |
| Motor Control Systems | On-Board Chargers (OBC) |
Use Scenario: Gate driving SiC MOSFETs in 400 V traction inverters for electric power steering and auxiliary drives. IC Role / Device Role / Timing Role: High-current (4.0 A) isolated driver supporting 100 kHz+ switching with fail-safe low-default behavior during MCU reset. Use Value: Eliminates need for external pull-down resistors or watchdog circuits - outputs auto-disable on VDDI loss or EN deassertion. |
Use Scenario: Driving high-side/low-side switches in bi-directional AC/DC and DC/DC stages of automotive OBC modules. IC Role / Device Role / Timing Role: AEC-Q100 qualified isolated driver with 125 °C operation and enhanced UVLO feedback for battery-side fault containment. Use Value: Enables coordinated shutdown of both power legs during battery overvoltage events via cross-rail UVLO status feedback. |
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 |
|---|---|---|---|
| SI8233BD-IS3 | Lower 2.5 A peak output; no UVLO status feedback; fixed 30 ns dead time. | Lacks cross-rail UVLO coordination - unsuitable for transformer-isolated topologies requiring flux balance. | Select when cost sensitivity outweighs need for enhanced safety feedback and higher drive strength. |
| UCC5390SCD | 3.5 A peak output; integrated Miller clamp; no programmable dead time; 3.75 kVRMS isolation. | Requires external circuitry for UVLO fault reporting; lacks 1 ms safe startup sequence. | Prefer when Miller clamping is required for SiC gate control, and isolation rating margin is acceptable. |
Compared with SI82391BD-IS3, SI8233BD-IS3 offers lower drive capability and no fault feedback, making it less suitable for high-reliability transformer-coupled designs; UCC5390SCD adds Miller clamping but sacrifices programmable dead time and failsafe startup sequencing - trade-offs require topology-specific validation.
Availability
SI82391BD-IS3 is available at Aetrix Electronics and suitable for industrial inverters, motor control systems, and on-board chargers requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified assurance.
Supply support for SI82391BD-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, isolation, and timing technologies.
The SI8239x family was engineered specifically for high-reliability isolated gate driving in power conversion systems - emphasizing safety-critical UVLO coordination, RF-based isolation stability, and automotive-grade robustness without optical degradation.
FAQ
What is the isolation voltage rating of the SI82391BD-IS3?
The SI82391BD-IS3 is rated for 5 kVRMS isolation withstand voltage per UL 1577 and IEC62368-1, supporting reinforced insulation in industrial and automotive power systems. This rating applies across the full operating temperature range (–40 °C to +125 °C) and is validated for 1 minute per safety agency requirements. The SI82391BD-IS3 achieves this using Skyworks' proprietary silicon RF isolation technology, not optocoupler-based methods.
Does the SI82391BD-IS3 support programmable dead time, and how is it configured?
Yes, the SI82391BD-IS3 supports programmable dead time in the 10–200 ns range, set via an external resistor connected to the DT pin. This feature is confirmed for the SI82391BD-IS3 variant in the official ordering guide and eliminates the need for controller-side dead-time insertion logic. The resistor value directly scales the delay, allowing precise tuning to match specific MOSFET/IGBT turn-on/turn-off characteristics in half-bridge configurations.
How does the enhanced UVLO function work in the SI82391BD-IS3?
The SI82391BD-IS3 implements enhanced UVLO with cross-rail status feedback: if either VDDA or VDDB drops below its 8 V threshold, the corresponding output (VOA or VOB) is forced low *and* that fault condition is communicated across the isolation barrier to disable the other output. This behavior is explicitly documented for Si82391-series devices and prevents transformer saturation in forward/flyback topologies - a key differentiator from basic UVLO-only drivers.
What is the purpose of the 1 ms delayed startup time in the SI82391BD-IS3?
SI82391BD-IS3 incorporates a guaranteed 1 ms safe delayed startup time (tSTARTUP_SAFE) from VDDI valid to stable output behavior. This ensures monotonic, glitch-free gate signals during system power-up - allowing MCUs or FPGAs time to initialize control logic before the driver becomes active. This feature is confirmed for SI82391 variants and is critical for avoiding unintended power-stage switching during boot sequences.
Is the SI82391BD-IS3 qualified for automotive applications?
Yes, the SI82391BD-IS3 is industrial-grade, but its automotive-grade counterpart SI82391BD-AS3 is AEC-Q100 qualified and manufactured using full automotive process flows. While SI82391BD-IS3 shares identical electrical parameters and construction with the AS3 version, only the AS3 suffix denotes formal automotive qualification - including AIAG-compliant PPAP documentation, IMDS/CAMDS compliance, and zero-defect methodology throughout production.
SI82391BD-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:
- 10V ~ 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
SI82391BD-IS3 FAQ
1.How can I place an order for SI82391BD-IS3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI82391BD-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 SI82391BD-IS3 reliable?
The price and inventory of SI82391BD-IS3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI82391BD-IS3 is usually 5 days.
3.What payment methods are accepted for SI82391BD-IS3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI82391BD-IS3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI82391BD-IS3?
SI82391BD-IS3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI82391BD-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 SI82391BD-IS3?
For technical support, including SI82391BD-IS3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI82391BD-IS3 requirements.
6.How does Aetrix verify that SI82391BD-IS3 is sourced from the original manufacturer or authorized distributors?
All SI82391BD-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 SI82391BD-IS3 meets industry standards.
7.What is the process for return or replacement of SI82391BD-IS3?
All SI82391BD-IS3 units undergo pre-shipment inspection (PSI). If there is an issue with SI82391BD-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 SI82391BD-IS3 part is unused and in its original packaging.
Return procedure for SI82391BD-IS3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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