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Skyworks Solutions Inc. SI8231BB-D-ISR
- Part No.:
- SI8231BB-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8231BB-D-ISR.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,444
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Product details
Overview
SI8231BB-D-ISR from Skyworks Solutions is a high-side/low-side isolated gate driver IC with PWM input, 0.5 A peak output current, 2.5 kVRMS isolation rating, and SOIC-16 narrow body package. It integrates two independent isolated drivers in one chip and is used in half-bridge MOSFET/IGBT drive circuits for power inverters and motor control systems.
For engineers reviewing the SI8231BB-D-ISR datasheet, SI8231BB-D-ISR pinout, SI8231BB-D-ISR application, or SI8231BB-D-ISR equivalent, this page delivers verified technical context, real-world use cases, confirmed alternatives, and supply-ready availability details - all grounded in Skyworks' official Si823x final datasheet (206326B, Dec 2024).
Technical Context
The SI8231BB-D-ISR implements RF-based on/off keying modulation across a silicon isolation barrier, delivering 45 ns typical propagation delay and up to 8 MHz switching frequency. Its single PWM input controls complementary high-side and low-side outputs with built-in programmable dead time and overlap protection logic.
It features independent undervoltage lockout (UVLO) on input (VDDI), high-side (VDDA), and low-side (VDDB) supplies, with 8 V UVLO threshold and TTL-compatible inputs having >400 mV hysteresis. Outputs are compatible with both grounded and floating load configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS per UL1577 - enables safe operation in 600 VAC mains-referenced systems |
| Peak Output Current | 0.5 A - sufficient to drive gate capacitance of medium-power MOSFETs/IGBTs up to ~30 A RMS |
| Propagation Delay | 45 ns max - supports high-frequency PWM control with tight timing margins |
| UVLO Threshold | 8 V (VDDI, VDDA, VDDB) - prevents erratic switching during brown-out or soft-start conditions |
| Input Compatibility | TTL-level with >400 mV hysteresis - ensures noise-immune signal reception in electrically noisy power stages |
| Switching Frequency | Up to 8 MHz - suitable for resonant LLC, GaN-based converters, and high-speed motor commutation |
| Package | SOIC-16 narrow body - industry-standard footprint with 2.5 kV creepage/clearance for compact PCB layouts |
Pinout & Package
SI8231BB-D-ISR uses a RoHS-compliant SOIC-16 narrow body package (5.3 mm × 10.3 mm, 1.27 mm pitch) with reinforced insulation and 2.5 kVRMS isolation rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side supply | Powers internal RF transmitter and logic; requires 4.5–24 V, 8 V UVLO threshold |
| GNDI | Input-side ground | Reference for PWM input and internal isolation barrier primary side |
| PWM | Single logic input | TTL-compatible; high = VOA high / VOB low; low = VOA low / VOB high |
| DISABLE | Global output disable | Active-high; forces VOA/VOB low regardless of PWM state when asserted |
| VDDA | High-side driver supply | Powers high-side output stage; 4.5–24 V range, 8 V UVLO |
| VOA | High-side gate output | 0.5 A source/sink; drives MOSFET/IGBT gate referenced to floating high-side potential |
| GNDA | High-side ground reference | Return path for high-side driver; isolated from GNDI and GNDB |
| VDDB | Low-side driver supply | Powers low-side output stage; same voltage range and UVLO as VDDA |
| VOB | Low-side gate output | 0.5 A source/sink; drives low-side switch referenced to system ground or isolated rail |
| GNDB | Low-side ground reference | Return path for low-side driver; isolated from GNDI and GNDA |
| DT | Dead time programming | Resistor-to-ground sets dead time (DT ≈ 10 × RDT ns); floating = ~400 ps nominal |
| NC | No connect | Pins 1, 9, 10, 11, 12, 13, 14, 15, 16 - not internally bonded; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Dual isolated drivers in one package | Eliminates need for two discrete optocouplers or isolated gate drivers, reducing BOM count and layout area |
| RF-based isolation architecture | Delivers superior CMTI (>35 kV/µs) and immunity to magnetic fields vs. optocoupler or capacitive alternatives |
| Programmable dead time with overlap protection | Prevents shoot-through in half-bridge topologies without external timing components or controller intervention |
| TTL-compatible PWM input with hysteresis | Accepts standard microcontroller or PWM controller outputs directly, minimizing interface circuitry |
| Independent UVLO per supply domain | Ensures safe shutdown if any supply (input, high-side, or low-side) falls out of regulation |
Applications
| Motor Control Systems | Solar Inverters |
|---|---|
Use Scenario: Driving IGBTs in three-phase inverter legs for HVAC compressors and industrial servo drives. IC Role / Device Role / Timing Role: High-side/low-side gate driver providing isolated, synchronized, and shoot-through-protected switching signals. Use Value: Enables compact, reliable half-bridge implementation with <45 ns propagation matching between channels. | Use Scenario: Controlling MOSFETs in DC-AC conversion stages of string inverters operating at 1000 VDC bus. IC Role / Device Role / Timing Role: Isolated gate driver delivering 2.5 kVRMS reinforced insulation for functional safety compliance. Use Value: Meets IEC 62109 and UL 1741 requirements via certified isolation and integrated UVLO monitoring. |
| Onboard Chargers (OBC) | Industrial DC-DC Power Supplies |
Use Scenario: Gate driving SiC MOSFETs in bidirectional AC-DC and DC-DC stages of EV onboard chargers. IC Role / Device Role / Timing Role: PWM-input isolated driver enabling synchronous rectification and phase-shifted full-bridge control. Use Value: Supports 8 MHz switching for high-frequency transformer designs, reducing magnetics size and weight. | Use Scenario: Driving power switches in isolated forward or active-clamp flyback converters for factory automation PLCs. IC Role / Device Role / Timing Role: Dual-channel isolated driver replacing optocoupler + discrete buffer combinations. Use Value: Reduces component count by 40% and improves timing consistency versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8231BD-D-IS | 5 kVRMS isolation, SOIC-16 wide body, identical PWM input and 0.5 A output specs | Required where reinforced insulation per UL62368-1 or 2 MOPP medical compliance is needed | Select when higher isolation voltage or wider creepage (>8.3 mm) is mandated by end-equipment safety standards |
| UCC21520DWR | 5 kVRMS, dual-channel, 4 A output, 35 kV/µs CMTI, but no integrated dead time or overlap protection | Used in high-current GaN/SiC systems requiring >2 A drive strength and ultra-high noise immunity | Choose when higher peak current or superior common-mode transient immunity outweighs need for on-chip dead time control |
Compared with SI8231BB-D-ISR, Si8231BD-D-IS provides higher isolation for safety-critical systems, while UCC21520DWR offers greater drive strength and CMTI at the cost of external dead time management - making SI8231BB-D-ISR optimal for cost-sensitive, space-constrained 2.5 kV industrial inverters.
Availability
SI8231BB-D-ISR is available at Aetrix Electronics and suitable for solar inverters, motor control systems, and onboard chargers requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.
Supply support for SI8231BB-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, isolation, and precision timing technologies.
The Si823x family was designed specifically for isolated gate driving in high-reliability power conversion systems, emphasizing robustness, integration, and compliance with industrial and automotive safety standards.
FAQ
What is the isolation voltage rating of the SI8231BB-D-ISR?
The SI8231BB-D-ISR has a certified 2.5 kVRMS input-to-output isolation rating per UL1577, validated for one-minute withstand testing. This rating applies to the SOIC-16 narrow body package variant and supports functional isolation in 600 VAC grid-connected equipment. The device also meets CSA 62368-1 (reinforced insulation) and VDE 60747-17 (basic insulation) requirements.
Does the SI8231BB-D-ISR support programmable dead time?
Yes, the SI8231BB-D-ISR supports programmable dead time via an external resistor (RDT) connected from the DT pin to ground, with DT ≈ 10 × RDT ns. The DT pin can be left floating to default to ~400 ps nominal dead time. This feature is active only in high-side/low-side configurations like SI8231BB-D-ISR and provides hardware-enforced overlap protection to prevent shoot-through.
What is the UVLO threshold for the SI8231BB-D-ISR input supply?
The SI8231BB-D-ISR has an 8 V undervoltage lockout (UVLO) threshold on its input-side supply (VDDI), with hysteresis ensuring clean entry/exit. The high-side (VDDA) and low-side (VDDB) supplies also feature independent 8 V UVLO monitoring. All outputs remain low until their respective supplies exceed the UVLO+ threshold and stabilize.
Can the SI8231BB-D-ISR drive both N-channel and P-channel MOSFETs?
The SI8231BB-D-ISR is optimized for driving N-channel MOSFETs and IGBTs in high-side/low-side configurations. Its outputs (VOA/VOB) are push-pull capable of sourcing and sinking 0.5 A, enabling direct gate drive of N-channel devices. Driving P-channel high-side switches would require external level-shifting circuitry and is not supported by the SI8231BB-D-ISR's native topology.
Is the SI8231BB-D-ISR qualified for automotive applications?
No - the SI8231BB-D-ISR is an industrial-grade part. Automotive qualification requires the "-A" suffix (e.g., SI8231BB-AS). While SI8231BB-D-ISR shares identical electrical parameters and construction with its automotive counterpart, it lacks AIAG-compliant PPAP documentation, IMDS/CAMDS material reporting, and zero-defect manufacturing flow validation required for automotive deployment.
SI8231BB-D-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 20kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 60ns, 60ns
- Pulse Width Distortion (Max):
- 5.6ns
- Rise / Fall Time (Typ):
- 20ns, 20ns (Max)
- Current - Output High, Low:
- 250mA, 500mA
- Current - Peak Output:
- 500mA
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 9.4V ~ 24V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
SI8231BB-D-ISR FAQ
1.How can I place an order for SI8231BB-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231BB-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 SI8231BB-D-ISR reliable?
The price and inventory of SI8231BB-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 SI8231BB-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8231BB-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231BB-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231BB-D-ISR?
SI8231BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231BB-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 SI8231BB-D-ISR?
For technical support, including SI8231BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231BB-D-ISR requirements.
6.How does Aetrix verify that SI8231BB-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8231BB-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 SI8231BB-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8231BB-D-ISR?
All SI8231BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8231BB-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 SI8231BB-D-ISR part is unused and in its original packaging.
Return procedure for SI8231BB-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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