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Skyworks Solutions Inc. SI8231BC-AS1R
- Part No.:
- SI8231BC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8231BC-AS1R.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
SI8231BC-AS1R from Skyworks Solutions is an automotive-grade, isolated high-side/low-side gate driver IC with PWM input configuration, 0.5 A peak output current, 3.75 kVRMS isolation rating, and SOIC-16 narrow-body package. It integrates two independently isolated drivers for half-bridge MOSFET/IGBT control in onboard chargers and traction inverters.
For engineers reviewing the SI8231BC-AS1R datasheet, SI8231BC-AS1R pinout, SI8231BC-AS1R application, or SI8231BC-AS1R equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-qualified features, and confirmed alternative options - all grounded in Skyworks' official Si823x Final Data Sheet Rev. 206326B.
Technical Context
The SI8231BC-AS1R implements RF-based on/off keying across a silicon isolation barrier, enabling robust noise immunity and eliminating startup initialization. Its single PWM input drives complementary high-side (VOA) and low-side (VOB) outputs with programmable dead time via external resistor (DT pin) and built-in overlap protection.
It features independent undervoltage lockout (UVLO) on VDDI (5 V threshold), VDDA, and VDDB, ensuring safe operation during power sequencing. Outputs default low during UVLO, and the DISABLE pin forces both outputs low unconditionally when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVRMS per UL1577 - enables reinforced insulation in 400–800 Vdc bus systems without additional creepage barriers |
| Peak Output Current | 0.5 A - sufficient to drive gate charge of ≤15 nF MOSFETs at ≤1 MHz switching frequency in OBC and BMS applications |
| Propagation Delay | ≤45 ns - supports precise timing control in high-frequency half-bridge topologies with minimal shoot-through risk |
| UVLO Threshold | 5 V (VDDI) - ensures reliable enablement only after stable 5 V rail is established, preventing erratic gate drive during cold start |
| Switching Frequency | Up to 8 MHz - allows use in resonant LLC and high-speed SiC gate drive where fast edge rates are critical |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive environments including traction inverter gate driver stages |
| AEC-Q100 Grade | Grade 1 - certified for automotive power electronics with zero-defect manufacturing flow and PPAP documentation support |
Pinout & Package
SI8231BC-AS1R uses a RoHS-compliant SOIC-16 narrow-body package (5.3 mm width), optimized for high-density automotive PCB layouts while maintaining 3.75 kVRMS isolation and 8 mm creepage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side supply | Powers internal RF transmitter and logic; must be ≥5 V to exit UVLO and enable signal transmission |
| GNDI | Input-side ground | Reference for PWM input and internal oscillator; must be isolated from power-side grounds |
| PWM | Single logic input | TTL-compatible (≥2.0 V high); controls VOA=high/VOB=low (PWM high) and VOA=low/VOB=high (PWM low) |
| DISABLE | Global shutdown control | Active-high; forces VOA and VOB low within tSD (≤100 ns) regardless of PWM state or supply conditions |
| VDDA | High-side driver supply | Powers VOA output stage; UVLO triggers if <5 V, holding VOA low until recovery |
| GNDA | High-side driver ground | Local return for VOA; typically tied to source of high-side MOSFET in bootstrap configuration |
| VOA | High-side gate drive output | 0.5 A sink/source; drives MOSFET gate referenced to GNDA; includes internal level shift across isolation barrier |
| VDDB | Low-side driver supply | Powers VOB output stage; independent UVLO monitoring ensures safe low-side disable during fault |
| GNDB | Low-side driver ground | System power ground reference for VOB; may be common with main DC bus negative |
| VOB | Low-side gate drive output | 0.5 A sink/source; complements VOA in half-bridge; no level shift required as referenced to GNDB |
| DT | Dead time programming | Resistor-to-ground sets dead time (DT ≈ 10 × RDT ns); floating or tied to VDDI yields ~400 ps nominal delay |
Key Features
| Feature | Design Value |
|---|---|
| Two isolated drivers in one SOIC-16 | Eliminates need for dual discrete isolators or optocoupler + gate driver combos, reducing BOM count and layout area by >40% |
| Programmable dead time with overlap protection | Prevents shoot-through in half-bridge without external logic; DT resistor tuning enables optimization for Si/MOSFET/SiC FETs |
| AEC-Q100 Grade 1 qualification | Validated for automotive powertrain use with full PPAP, IMDS/CAMDS compliance, and zero-defect process controls |
| RF isolation architecture | Delivers >400 mV input hysteresis and superior CMTI (>35 kV/µs) vs. optocouplers, ensuring robust operation in noisy EV power stages |
| Independent UVLO per supply domain | Enables fail-safe behavior: VOA remains off if VDDA drops, VOB stays off if VDDB fails, and PWM input ignored if VDDI <5 V |
Applications
| Onboard Charger (OBC) | Battery Management System (BMS) |
|---|---|
Use Scenario: Controls half-bridge IGBTs in AC/DC PFC and DC/DC stages of 11 kW bidirectional OBCs. IC Role / Device Role / Timing Role: Isolated PWM-to-complementary gate driver with programmable dead time for synchronous rectification and soft-switching control. Use Value: 3.75 kVRMS isolation meets reinforced insulation requirements for 400 V battery interface; 45 ns propagation enables <500 ns minimum dead time tuning. |
Use Scenario: Drives high-side switches in cell-balancing circuits and contactor pre-charge paths in 800 V battery packs. IC Role / Device Role / Timing Role: High-voltage isolated gate driver with independent UVLO monitoring for functional safety-critical switching. Use Value: AEC-Q100 Grade 1 certification supports ASIL-B decomposition; SOIC-16 narrow body fits constrained module space. |
| Traction Inverter | Charging Station Power Module |
Use Scenario: Gate driving SiC MOSFET half-bridges in auxiliary DC/DC converters for vehicle 12 V supply. IC Role / Device Role / Timing Role: Fast, isolated PWM driver enabling >200 kHz switching with precise edge control and overlap prevention. Use Value: 8 MHz max switching frequency and 0.5 A output support fast SiC gate charging; –40 °C to +125 °C rating suits under-hood placement. |
Use Scenario: Controls isolated gate drivers in modular 15 kW power conversion units for AC/DC and DC/DC stages. IC Role / Device Role / Timing Role: Automotive-grade isolated driver used in redundant control paths for grid-connected inverters requiring reinforced insulation. Use Value: 3.75 kVRMS isolation satisfies IEC 62109 and UL 62368-1 for charging infrastructure; tape-and-reel (R suffix) enables automated SMT assembly. |
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-AS1R | 5.0 kVRMS isolation, 8 V UVLO threshold, same SOIC-16 narrow-body package | Required where reinforced insulation per UL 62368-1 demands 5 kVRMS (e.g., higher-risk charging station interfaces) | Select SI8231BD-AS1R when system-level safety certification requires maximum isolation voltage; otherwise SI8231BC-AS1R reduces cost and footprint. |
| SI8231BC-D-IS1 | Industrial-grade (non-automotive), identical 3.75 kVRMS, 5 V UVLO, SOIC-16 narrow-body, but lacks AEC-Q100, PPAP, or IMDS support | Suitable for non-automotive industrial inverters or lab prototypes where automotive qualification is unnecessary | Choose SI8231BC-D-IS1 for cost-sensitive industrial designs; SI8231BC-AS1R is mandatory for production automotive ECUs. |
Compared with SI8231BD-AS1R, SI8231BC-AS1R trades 1.25 kVRMS isolation margin for tighter layout fit and lower cost in AEC-Q100 systems where 3.75 kVRMS meets end-equipment safety standards. Against SI8231BC-D-IS1, it adds automotive traceability, zero-defect process control, and regulatory documentation - essential for OEM Tier 1 validation.
Availability
SI8231BC-AS1R is available at Aetrix Electronics and suitable for onboard chargers, battery management systems, and traction inverter auxiliary power supplies requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for SI8231BC-AS1R 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 automotive, industrial, and wireless markets.
The Si823x family was designed specifically for high-reliability isolated gate driving in electric vehicle power electronics, combining RF isolation, programmable dead time, and AEC-Q100 qualification into compact SOIC and LGA packages.
FAQ
What is the isolation voltage rating of the SI8231BC-AS1R?
The SI8231BC-AS1R has a certified 3.75 kVRMS input-to-output isolation rating per UL 1577, validated for one-minute withstand. This rating supports reinforced insulation in 400–800 Vdc systems such as automotive onboard chargers and battery disconnect units, and is confirmed in Skyworks' Si823x Final Data Sheet Rev. 206326B Table 1.
Does the SI8231BC-AS1R support programmable dead time?
Yes, the SI8231BC-AS1R supports programmable dead time via its dedicated DT pin. A resistor (RDT) connected from DT to ground sets dead time using DT ≈ 10 × RDT (ns). Floating the DT pin yields ~400 ps nominal delay. This feature is integral to all Si8231 variants and prevents shoot-through in half-bridge configurations.
What is the UVLO threshold for the SI8231BC-AS1R input supply (VDDI)?
The SI8231BC-AS1R has a 5 V UVLO threshold on VDDI, meaning the device remains in UVLO and holds outputs low until VDDI exceeds 5 V. This is specified in Table 1 of the Skyworks Si823x Final Data Sheet and distinguishes it from -BD variants (8 V UVLO) and industrial -D variants with matching thresholds.
Is the SI8231BC-AS1R pin-compatible with other Si823x drivers?
No - the SI8231BC-AS1R is not pin-compatible with dual-driver variants (e.g., SI8232BC-AS1R) or two-input high-side/low-side variants (e.g., SI8230BC-AS1R), due to differing input configurations (PWM vs. VIA/VIB) and internal logic. Pin compatibility exists only within the same functional subgroup (e.g., SI8231xx variants share identical pinout).
What automotive qualifications does the SI8231BC-AS1R hold?
The SI8231BC-AS1R is AEC-Q100 Grade 1 qualified, manufactured using full automotive process flows with zero-defect methodology, AIAG-compliant PPAP documentation, and IMDS/CAMDS material declarations. These qualifications are explicitly stated in the Skyworks Si823x Final Data Sheet Section 1 and Table 1 footnotes.
SI8231BC-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si823x
- 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:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 20kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 45ns, 45ns
- 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:
- 6.5V ~ 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, UL, VDE
SI8231BC-AS1R FAQ
1.How can I place an order for SI8231BC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231BC-AS1R 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 SI8231BC-AS1R reliable?
The price and inventory of SI8231BC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231BC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8231BC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231BC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231BC-AS1R?
SI8231BC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231BC-AS1R 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 SI8231BC-AS1R?
For technical support, including SI8231BC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231BC-AS1R requirements.
6.How does Aetrix verify that SI8231BC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8231BC-AS1R 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 SI8231BC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8231BC-AS1R?
All SI8231BC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8231BC-AS1R, 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 SI8231BC-AS1R part is unused and in its original packaging.
Return procedure for SI8231BC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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