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Skyworks Solutions Inc. SI8231AC-AS1R
- Part No.:
- SI8231AC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8231AC-AS1R.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
SI8231AC-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 independent isolated channels using silicon-based RF isolation for robust MOSFET/IGBT drive in half-bridge topologies within onboard chargers and battery management systems.
For engineers reviewing the SI8231AC-AS1R datasheet, SI8231AC-AS1R pinout, SI8231AC-AS1R application, or SI8231AC-AS1R equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed automotive qualification status (AEC-Q100), and two rigorously cross-checked alternative parts for isolated gate drive selection.
Technical Context
The SI8231AC-AS1R implements a single PWM input controlling complementary high-side and low-side outputs with built-in programmable dead time and overlap protection. Its RF-based isolation barrier provides 3.75 kVRMS withstand voltage per UL1577 and supports up to 8 MHz switching frequency with 45 ns typical propagation delay.
It features independent undervoltage lockout (UVLO) on input (VDDI), high-side (VDDA), and low-side (VDDB) supplies - all set at 5 V threshold - and TTL-compatible input with >400 mV hysteresis. The DISABLE pin forces both outputs low unconditionally when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVRMS (UL1577), enabling reinforced insulation in 400–800 Vdc bus systems without external creepage enhancement |
| Peak Output Current | 0.5 A source/sink, sufficient to drive 1200 V SiC MOSFETs with <10 nC gate charge at ≤100 kHz switching |
| Propagation Delay | 45 ns max, ensuring tight timing control in high-frequency half-bridge PWM schemes with minimal shoot-through risk |
| UVLO Threshold | 5 V (VDDI/VDDA/VDDB), providing stable operation across automotive battery transients (e.g., load dump, cold crank) |
| Switching Frequency | Up to 8 MHz, supporting resonant LLC and advanced soft-switching topologies in OBC and DC-DC converters |
| Package | SOIC-16 narrow body (5.3 mm width), compatible with standard SMT assembly and offering 8.3 mm creepage for 3.75 kVRMS compliance |
| AEC-Q100 Grade | Qualified to Grade 1 (−40 °C to +125 °C), validated for under-hood and traction powertrain environments |
Pinout & Package
SI8231AC-AS1R uses a RoHS-compliant SOIC-16 narrow-body package (5.3 mm width, 10.3 mm length) with 0.65 mm pitch and 260 °C peak reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side supply | Provides 4.5–5.5 V power to internal RF transmitter and logic; UVLO triggers below 5 V |
| GNDI | Input-side ground | Reference for PWM input and internal isolation barrier; must be separated from power ground |
| PWM | Single logic input | TTL-compatible (≥2.0 V high), controls VOA high / VOB low (high), VOA low / VOB high (low) |
| DISABLE | Global output disable | Active-high signal forcing VOA and VOB low regardless of PWM state; no effect if VDDI < UVLO |
| VDDA | High-side driver supply | Supplies 12–24 V to high-side output stage; UVLO active below 5 V, holding VOA low |
| VOA | High-side gate output | 0.5 A capable driver referenced to GNDA; designed for bootstrap or isolated supply configurations |
| GNDA | High-side ground | Return path for VOA; electrically isolated from GNDI and GNDB by 3.75 kVRMS barrier |
| VDDB | Low-side driver supply | Supplies 12–24 V to low-side output stage; UVLO active below 5 V, holding VOB low |
| VOB | Low-side gate output | 0.5 A capable driver referenced to GNDB; connects directly to power ground in half-bridge layouts |
| GNDB | Low-side ground | Return path for VOB; isolated from GNDI and GNDA; typically tied to system power ground |
| DT | Dead time programming | Resistor-to-ground sets dead time (DT ≈ 10 × RDT ns); floating or tied to VDDI yields ~400 ps nominal |
| NC | No connect | Pins 1, 2, 15, and 16 are internally unused; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dead time with overlap protection | Prevents shoot-through in half-bridge by enforcing user-defined delay (via external resistor) between VOA and VOB transitions |
| Independent triple UVLO monitoring | Ensures safe default-low behavior on VOA/VOB when any of VDDI, VDDA, or VDDB falls below 5 V - critical for automotive transient resilience |
| RF-based silicon isolation | Delivers 45 ns propagation delay and superior CMTI (>50 kV/µs) vs. optocouplers, eliminating LED aging and temperature drift |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from −40 °C to +125 °C ambient, including thermal cycling, HTOL, and ESD testing per automotive requirements |
| PWM-input architecture | Reduces controller GPIO count and simplifies timing alignment versus dual-input drivers - ideal for MCU-based OBC gate control |
Applications
| Onboard Charger (OBC) | Battery Management System (BMS) |
|---|---|
Use Scenario: Driving high-voltage half-bridge in 3.3 kW bidirectional AC/DC converter with SiC MOSFETs. IC Role / Device Role / Timing Role: Isolated PWM gate driver providing complementary, dead-time-controlled outputs for primary-side switching with reinforced insulation. Use Value: Enables compact, high-efficiency OBC design meeting IEC 62109 and UL 62368-1 reinforced insulation requirements at 3.75 kVRMS. |
Use Scenario: Controlling precharge and main contactor drivers in 800 V EV battery pack with fault-tolerant isolation. IC Role / Device Role / Timing Role: Dual-channel isolated driver delivering independent, UVLO-protected gate signals to high-side and low-side contactor MOSFETs. Use Value: Guarantees fail-safe contactor turn-off during brownout or supply loss via triple UVLO, satisfying ASIL-B functional safety goals. |
| Charging Station Power Stage | Traction Inverter Auxiliary Supply |
Use Scenario: Gate driving for isolated DC-DC auxiliary power supply feeding control circuitry in 150 kW CCS fast charger. IC Role / Device Role / Timing Role: High-side/low-side isolated driver operating at 500 kHz with precise dead time to minimize conduction losses. Use Value: Supports high-density, thermally efficient auxiliary supply design with 8 MHz capability and low 45 ns propagation skew. |
Use Scenario: Driving gate of isolated flyback MOSFET supplying 15 V bias to traction inverter gate drivers. IC Role / Device Role / Timing Role: Automotive-grade isolated driver ensuring reliable startup and shutdown sequencing under wide battery voltage range. Use Value: Maintains gate drive integrity during cold-crank (4.5 V) and load-dump (27 V) events due to 5 V UVLO and 24 V absolute max VDD rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8231AD-AS1R | Same PWM-input HS/LS architecture and 0.5 A rating, but 5.0 kVRMS isolation and SOIC-16 wide-body package (7.5 mm width) | Required where reinforced insulation demands ≥5.0 kVRMS (e.g., industrial inverters, grid-tied solar) | Select Si8231AD-AS1R when higher isolation voltage is mandated; note wider PCB footprint and increased creepage clearance |
| UCC5390SCDR | Texas Instruments part with 5.7 kVRMS isolation, 4 A peak output, and integrated Miller clamp; no programmable dead time | Suitable for high-power traction inverters needing stronger drive and active Miller clamping, but lacks DT tuning | Choose UCC5390SCDR for >1 kW motor drives requiring higher current and fault protection; accept fixed dead time and different pinout |
Compared with SI8231AC-AS1R, Si8231AD-AS1R offers higher isolation at the cost of board space, while UCC5390SCDR trades programmable dead time for higher drive strength and integrated protection - making each optimal for distinct voltage, power, and control granularity requirements.
Availability
SI8231AC-AS1R is available at Aetrix Electronics and suitable for onboard chargers, battery management systems, and charging station power stages requiring stable component supply, automotive qualification, and reinforced isolation compliance.
Supply support for SI8231AC-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, isolation, and precision timing technologies.
The Si823x family was engineered specifically for automotive and industrial isolated gate drive applications, emphasizing high CMTI, AEC-Q100 reliability, and flexible configuration (PWM or dual-input) in compact packages.
FAQ
What is the isolation voltage rating of the SI8231AC-AS1R and which safety standards does it meet?
The SI8231AC-AS1R has a certified 3.75 kVRMS input-to-output isolation rating per UL 1577. It meets CSA 62368-1 (reinforced insulation), VDE 60747-17 (basic insulation), and CQC GB4943.1 (reinforced insulation) requirements. This rating enables use in automotive onboard chargers and auxiliary power supplies where reinforced insulation is mandated for functional safety and user protection.
Does the SI8231AC-AS1R support programmable dead time, and how is it configured?
Yes, the SI8231AC-AS1R supports programmable dead time via the DT pin. A resistor (RDT) connected from DT to ground sets the delay using DT ≈ 10 × RDT (ns). For example, a 100 kΩ resistor yields ~1 µs dead time. The pin may be left floating or tied to VDDI for ~400 ps nominal dead time. A 0.1 µF ceramic capacitor placed near the DT pin improves noise immunity.
What is the undervoltage lockout (UVLO) behavior of the SI8231AC-AS1R across its supply domains?
The SI8231AC-AS1R implements independent UVLO on VDDI, VDDA, and VDDB - all with 5 V thresholds. When any supply drops below 5 V, its associated function is disabled: VDDI UVLO halts input sampling, while VDDA/VDDB UVLO forces VOA/VOB low. This triple-monitoring ensures fail-safe operation during automotive battery transients, and all outputs return to valid states only after all supplies exceed UVLO+.
Is the SI8231AC-AS1R pin-compatible with other Si823x variants such as the SI8231BD-AS1R?
No, the SI8231AC-AS1R is not pin-compatible with SI8231BD-AS1R. While both are PWM-input HS/LS drivers, SI8231AC-AS1R uses SOIC-16 narrow-body packaging (5.3 mm width), whereas SI8231BD-AS1R uses SOIC-16 wide-body (7.5 mm width). Pin functions match, but mechanical dimensions, creepage, and isolation ratings differ - requiring PCB layout changes for substitution.
What automotive qualifications does the SI8231AC-AS1R hold, and what documentation is available?
The SI8231AC-AS1R is qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C) and supported with AIAG-compliant PPAP documentation, IMDS and CAMDS material declarations, and full automotive process flow validation. These ensure zero-defect manufacturing and traceability required for EV powertrain applications including onboard chargers and battery management systems.
SI8231AC-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
SI8231AC-AS1R FAQ
1.How can I place an order for SI8231AC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231AC-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 SI8231AC-AS1R reliable?
The price and inventory of SI8231AC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231AC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8231AC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231AC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231AC-AS1R?
SI8231AC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231AC-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 SI8231AC-AS1R?
For technical support, including SI8231AC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231AC-AS1R requirements.
6.How does Aetrix verify that SI8231AC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8231AC-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 SI8231AC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8231AC-AS1R?
All SI8231AC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8231AC-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 SI8231AC-AS1R part is unused and in its original packaging.
Return procedure for SI8231AC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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