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Skyworks Solutions Inc. SI8231BB-D-IS1R
- Part No.:
- SI8231BB-D-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8231BB-D-IS1R.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:18,744
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Product details
Overview
SI8231BB-D-IS1R 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 channels using silicon-based RF isolation for robust MOSFET/IGBT drive in half-bridge topologies within power inverters and motor control systems.
For engineers reviewing the SI8231BB-D-IS1R datasheet, SI8231BB-D-IS1R pinout, SI8231BB-D-IS1R application, or SI8231BB-D-IS1R equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed automotive-grade alternatives, and supply-chain support details specific to this exact variant.
Technical Context
The SI8231BB-D-IS1R implements a single PWM input controlling complementary high-side (VOA) and low-side (VOB) outputs with built-in programmable dead time and overlap protection. Its RF-based isolation barrier provides 2.5 kVRMS withstand voltage per UL1577 and supports up to 8 MHz switching frequency.
It features TTL-compatible PWM input with >400 mV hysteresis, independent undervoltage lockout (UVLO) on VDDI (8 V threshold), VDDA, and VDDB, and operates across –40 °C to +125 °C. Output drivers are rated for 0.5 A peak source/sink with 45 ns typical propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS - meets reinforced insulation requirements per UL1577 for functional safety in industrial power systems |
| Peak Output Current | 0.5 A - sufficient to drive medium-power MOSFETs/IGBTs in half-bridge configurations up to ~1 kW |
| Propagation Delay | 45 ns - enables precise timing control in high-frequency switching applications such as solar inverters |
| UVLO Threshold | 8 V on VDDI - prevents erratic operation during brown-out conditions; ensures clean startup above minimum logic supply |
| Switching Frequency | Up to 8 MHz - supports high-efficiency resonant and hard-switched topologies including LLC and phase-shifted full-bridge |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments without derating |
| Input Compatibility | TTL-level PWM with >400 mV hysteresis - rejects noise in electrically noisy motor drive and power conversion environments |
Pinout & Package
SI8231BB-D-IS1R uses a RoHS-compliant SOIC-16 narrow-body package (5.3 mm width) with 1.27 mm pitch, optimized for high-density PCB layouts while maintaining 2.5 kVRMS isolation clearance and creepage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side power supply | Supplies 4.5–24 V to internal RF transmitter; UVLO triggers at 8 V |
| GNDI | Input-side ground reference | Reference for PWM input and internal oscillator; galvanically isolated from output grounds |
| PWM | Single logic input | TTL-compatible; high = VOA high / VOB low; low = VOA low / VOB high |
| DISABLE | Global output disable | Active-high; forces both VOA and VOB low regardless of PWM state |
| VDDA | High-side driver supply | Drives VOA; UVLO active below 8 V; supports up to 24 V |
| GNDA | High-side driver ground | Reference for VOA output; isolated from GNDI and GNDB |
| VOA | High-side gate output | 0.5 A peak source/sink; drives gate of high-side switch in half-bridge |
| VDDB | Low-side driver supply | Drives VOB; UVLO active below 8 V; supports up to 24 V |
| GNDB | Low-side driver ground | Reference for VOB output; isolated from GNDI and GNDA |
| VOB | Low-side gate output | 0.5 A peak source/sink; drives gate of low-side switch in half-bridge |
| DT | Dead time programming | Resistor-to-ground sets dead time (e.g., 100 kΩ ≈ 1 µs); floating = ~400 ps nominal |
Key Features
| Feature | Design Value |
|---|---|
| Two isolated drivers in one package | Eliminates need for two discrete optocouplers or isolated gate drivers, reducing BOM count and layout area by >40% |
| Programmable dead time with overlap protection | Prevents shoot-through in half-bridge circuits via external resistor tuning - no FPGA or MCU intervention required |
| RF-based silicon isolation | Delivers 45 ns propagation delay and superior CMTI (>50 kV/µs) vs. optocoupler-based alternatives |
| TTL-compatible PWM input with hysteresis | Enables direct interface with MCU PWM peripherals without level-shifting or Schmitt-trigger buffers |
| Independent UVLO on all supplies | Guarantees safe shutdown if any rail (VDDI, VDDA, or VDDB) drops below 8 V - critical for fault-tolerant power stages |
Applications
| Motor Control Systems | Solar Inverters |
|---|---|
Use Scenario: Driving IGBTs in three-phase inverter stages for HVAC compressors and industrial servo drives. IC Role / Device Role / Timing Role: High-side/low-side gate driver with PWM input and programmable dead time ensuring shoot-through-free commutation. Use Value: 45 ns propagation delay enables precise 20 kHz PWM timing; 0.5 A output sustains gate charge for 600 V/30 A IGBTs. | Use Scenario: Controlling MOSFETs in DC-AC stage of string inverters with MPPT tracking. IC Role / Device Role / Timing Role: Isolated gate driver enabling transformerless topology with reinforced 2.5 kVRMS barrier compliance. Use Value: 2.5 kVRMS isolation meets IEC 62109-1 for PV system safety; SOIC-16 narrow-body fits compact heatsink layouts. |
| Onboard Chargers (OBC) | Traction Inverters (EV) |
Use Scenario: Bidirectional AC/DC and DC/DC conversion in 6.6 kW EV onboard chargers. IC Role / Device Role / Timing Role: Half-bridge driver for SiC MOSFETs in totem-pole PFC and isolated DC-DC stages. Use Value: TTL PWM input interfaces directly with OBC controller MCU; –40 °C to +125 °C rating supports under-hood placement. | Use Scenario: Gate driving for 750 V IGBT modules in 150 kW traction inverters. IC Role / Device Role / Timing Role: Isolated high-side/low-side driver with overlap protection for reliable motor phase switching. Use Value: Independent UVLO on VDDA/VDDB prevents partial drive during bus voltage sag; 8 MHz capability supports advanced modulation schemes. |
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-IS1R | 5.0 kVRMS isolation rating; same SOIC-16 narrow-body package and 0.5 A output | Required for designs needing reinforced insulation per IEC 62368-1 or medical 2 MOPP standards | Select when higher isolation voltage is mandated by end-equipment safety certification |
| SI8231AB-D-IS1R | 5 V UVLO threshold (vs. 8 V); otherwise identical pinout, function, and 2.5 kVRMS rating | Suitable for low-voltage control domains where 5 V logic rails dominate and brown-out margin is relaxed | Choose when interfacing with 5 V microcontrollers and lower-supply systems without risk of marginal VDDI operation |
Compared with SI8231BD-D-IS1R, SI8231BB-D-IS1R trades 2.5 kVRMS for smaller footprint and cost in non-medical/non-utility applications; versus SI8231AB-D-IS1R, it offers tighter UVLO hysteresis and improved noise immunity at 8 V threshold.
Availability
SI8231BB-D-IS1R is available at Aetrix Electronics and suitable for motor control systems, solar inverters, onboard chargers, and traction inverters requiring stable component supply across automotive and industrial production cycles.
Supply support for SI8231BB-D-IS1R 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, programmable timing control, and automotive-grade qualification (AEC-Q100).
FAQ
What is the isolation voltage rating of the SI8231BB-D-IS1R?
The SI8231BB-D-IS1R has a certified 2.5 kVRMS input-to-output isolation rating per UL1577, validated for one minute. This rating applies to the SOIC-16 narrow-body package and supports reinforced insulation in industrial and automotive power systems where 2.5 kV meets safety requirements without demanding the 5.0 kVRMS of wider-body variants like SI8231BD-D-IS1R.
Does the SI8231BB-D-IS1R support programmable dead time?
Yes, the SI8231BB-D-IS1R supports programmable dead time via an external resistor (RDT) connected from the DT pin to ground. Using Equation 1 (DT ≈ 10 × RDT), a 100 kΩ resistor yields ~1 µs dead time. The DT pin can also be left floating for ~400 ps nominal dead time. This feature is active only in high-side/low-side configurations like SI8231BB-D-IS1R - not in dual-driver variants.
What is the UVLO threshold for the SI8231BB-D-IS1R input supply (VDDI)?
The SI8231BB-D-IS1R has an 8 V undervoltage lockout (UVLO) threshold on VDDI, with hysteresis ensuring stable entry/exit. When VDDI falls below 8 V, outputs VOA and VOB are forced low. This 8 V threshold is shared with other "B"-suffix variants (e.g., SI8231BB-D-IS1R, SI8231BD-D-IS1R) and differs from "A"-suffix parts (e.g., SI8231AB-D-IS1R) which use a 5 V UVLO threshold.
Can the SI8231BB-D-IS1R drive SiC MOSFETs?
Yes, the SI8231BB-D-IS1R can drive discrete SiC MOSFETs in half-bridge configurations. Its 0.5 A peak output current, 45 ns propagation delay, and >50 kV/µs common-mode transient immunity (CMTI) meet typical gate-drive requirements for 650 V and 1200 V SiC devices operating up to 100 kHz. Layout best practices - including short gate traces and local 0.1 µF decoupling at VDDA/VDDB - are essential for optimal performance.
Is the SI8231BB-D-IS1R qualified for automotive applications?
No - the SI8231BB-D-IS1R is an industrial-grade part (denoted by "-I" suffix). Automotive-grade equivalents include SI8231BB-AS1R (AEC-Q100 qualified, AIAG PPAP support, IMDS/CAMDS compliant). While SI8231BB-D-IS1R shares identical electrical parameters and package with its automotive counterpart, it lacks the full automotive process flow, zero-defect methodology, and documentation required for automotive production release.
SI8231BB-D-IS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-IS1R FAQ
1.How can I place an order for SI8231BB-D-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231BB-D-IS1R 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-IS1R reliable?
The price and inventory of SI8231BB-D-IS1R 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-IS1R is usually 5 days.
3.What payment methods are accepted for SI8231BB-D-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231BB-D-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231BB-D-IS1R?
SI8231BB-D-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231BB-D-IS1R 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-IS1R?
For technical support, including SI8231BB-D-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231BB-D-IS1R requirements.
6.How does Aetrix verify that SI8231BB-D-IS1R is sourced from the original manufacturer or authorized distributors?
All SI8231BB-D-IS1R 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-IS1R meets industry standards.
7.What is the process for return or replacement of SI8231BB-D-IS1R?
All SI8231BB-D-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8231BB-D-IS1R, 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-IS1R part is unused and in its original packaging.
Return procedure for SI8231BB-D-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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