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Skyworks Solutions Inc. SI8231AB-AS1R
- Part No.:
- SI8231AB-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8231AB-AS1R.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,263
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Product details
Overview
SI8231AB-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, 2.5 kVRMS isolation rating, and SOIC-16 narrow-body package. It integrates two independently isolated drivers for half-bridge MOSFET/IGBT control in traction inverters and onboard chargers.
For engineers reviewing the SI8231AB-AS1R datasheet, SI8231AB-AS1R pinout, SI8231AB-AS1R application, or SI8231AB-AS1R equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-qualified feature value, and confirmed alternative options for isolated gate drive selection.
Technical Context
The SI8231AB-AS1R implements RF-based silicon isolation with a proprietary semiconductor barrier, delivering 45 ns typical propagation delay and >400 mV input hysteresis for robust noise immunity. Its single PWM input drives complementary high-side (VOA) and low-side (VOB) outputs with programmable dead time via external resistor.
It features independent undervoltage lockout (UVLO) on VDDI (5 V threshold), VDDA, and VDDB, plus integrated overlap protection that prevents simultaneous high-state outputs. The device operates across –40 °C to +125 °C and supports up to 8 MHz switching frequency in automotive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS per UL1577 - enables reinforced insulation in 400 Vdc bus systems without additional creepage barriers |
| Peak Output Current | 0.5 A - sufficient to drive 1200 V SiC MOSFETs with <10 nC gate charge at 100 kHz switching |
| Propagation Delay | 45 ns max - ensures tight timing alignment between high-side and low-side edges in fast-switching inverters |
| UVLO Threshold | 5 V on VDDI - matches common 5 V MCU logic rails and prevents erratic startup during brownout conditions |
| Switching Frequency | Up to 8 MHz - supports high-frequency resonant LLC and GaN-based DC-DC topologies |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive environments per AEC-Q100 Grade 1 |
| Package | SOIC-16 narrow body - provides 2.5 mm creepage/clearance for compact motor control PCB layouts |
Pinout & Package
SI8231AB-AS1R uses a RoHS-compliant SOIC-16 narrow-body package (5.3 mm × 10.3 mm) with 1.27 mm pitch, rated for 260 °C peak reflow per JEDEC J-STD-020.
| 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 output operation |
| GNDI | Input-side ground | Reference for PWM input and internal oscillator; must be isolated from power-side grounds |
| PWM | Single TTL-compatible input | High-true signal: VOA = high / VOB = low when PWM = high; reverse when PWM = low |
| DISABLE | Global output disable | Active-high; forces both VOA and VOB low within tSD ≤ 100 ns, independent of input state |
| VDDA | High-side driver supply | Provides gate drive voltage for VOA; UVLO triggers if <5 V, forcing VOA low |
| GNDA | High-side driver ground | Return path for VOA output; typically tied to source of high-side MOSFET |
| VOA | High-side gate drive output | Sourcing/sinking 0.5 A peak; designed for bootstrap or isolated supply configurations |
| VDDB | Low-side driver supply | Supplies VOB; independent UVLO monitoring ensures safe low-side shutdown during fault |
| GNDB | Low-side driver ground | Return path for VOB; commonly connected to system power ground |
| VOB | Low-side gate drive output | Complementary to VOA; enables synchronous half-bridge switching with dead-time control |
| DT | Dead time programming | Resistor-to-ground sets dead time (DT ≈ 10 × RDT ns); floating or tied to VDDI yields ~400 ps nominal |
Key Features
| Feature | Design Value |
|---|---|
| RF-based silicon isolation | Eliminates LED aging and CMTI drift; achieves >35 kV/µs common-mode transient immunity in noisy inverter environments |
| Programmable dead time | Enables precise tuning of shoot-through prevention across temperature and load variations using one external resistor |
| Independent UVLO per supply rail | Prevents partial operation: VOA remains off if VDDA drops below 5 V, even if VDDI and VDDB are valid |
| AEC-Q100 Grade 1 qualification | Validated for automotive powertrain use with zero-defect manufacturing flow, PPAP documentation, and IMDS/CAMDS compliance |
| TTL-compatible PWM input | Direct interface with microcontrollers and DSPs without level-shifting; >400 mV hysteresis rejects EMI-induced glitches |
Applications
| Onboard Charger (OBC) | Traction Inverter |
|---|---|
Use Scenario: Isolated gate driving for bidirectional AC/DC and DC/DC stages in 11 kW OBC modules. IC Role / Device Role / Timing Role: High-side/low-side driver for SiC half-bridges in PFC and CLLC resonant converters. Use Value: 45 ns propagation matching minimizes timing skew between legs, reducing conduction losses by up to 8% at 100 kHz. |
Use Scenario: Driving IGBTs/MOSFETs in 3-phase inverter legs for BEV powertrains. IC Role / Device Role / Timing Role: PWM-controlled isolated driver enabling synchronized switching with programmable dead time. Use Value: Independent UVLO on VDDA/VDDB ensures safe shutdown of individual inverter legs during overvoltage faults. |
| Battery Management System (BMS) | Charging Station Power Module |
Use Scenario: Isolated gate control for contactor drivers and precharge circuits in high-voltage battery packs. IC Role / Device Role / Timing Role: Dual-channel isolated driver managing main and precharge switches in HV disconnect units. Use Value: 2.5 kVRMS isolation meets reinforced insulation requirements for 900 Vdc battery systems per ISO 6469-3. |
Use Scenario: Gate driving in modular 20 kW+ DC fast charging power stacks. IC Role / Device Role / Timing Role: High-reliability isolated driver for SiC half-bridges operating at 150 kHz switching frequency. Use Value: RF isolation technology maintains timing accuracy over lifetime, avoiding optocoupler degradation in 15-year field deployments. |
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-AS1 | 5.0 kVRMS isolation rating; same PWM input, 0.5 A output, and SOIC-16 narrow-body package | Required where reinforced insulation per UL62368-1 or IEC60601-1 (2 MOPP) is mandated for medical or industrial safety standards | Select Si8231AD-AS1 when higher isolation voltage is needed; no PCB changes required due to identical footprint and pinout |
| UCC5390SCD | TI part with 5 kVRMS isolation, 4 A peak output, and integrated Miller clamp; requires external dead-time circuitry | Preferred for high-current SiC/GaN designs needing >1 A drive strength and active Miller clamping | Choose UCC5390SCD only when 4 A drive capability and Miller clamping are essential; layout changes needed for different pinout and biasing |
Compared with SI8231AB-AS1R, Si8231AD-AS1 offers higher isolation for safety-critical systems without altering board layout, while UCC5390SCD trades integration simplicity for higher drive strength and added protection features-requiring redesign effort.
Availability
SI8231AB-AS1R is available at Aetrix Electronics and suitable for automotive onboard chargers, traction inverters, and battery management systems requiring stable component supply with full AEC-Q100 traceability and PPAP support.
Supply support for SI8231AB-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 infrastructure markets.
The Si823x family was engineered specifically for high-reliability isolated gate driving in electric vehicle power systems, combining RF isolation, programmable dead time, and AEC-Q100 qualification into compact packages.
FAQ
What is the isolation voltage rating of the SI8231AB-AS1R and how is it certified?
The SI8231AB-AS1R has a 2.5 kVRMS input-to-output isolation rating, certified per UL 1577 for one-minute withstand voltage. It also meets CSA 62368-1 (reinforced insulation) and VDE 60747-17 (basic insulation) standards. This rating is validated across the full operating temperature range and applies to the SOIC-16 narrow-body package used in the SI8231AB-AS1R.
Does the SI8231AB-AS1R support programmable dead time, and how is it configured?
Yes, the SI8231AB-AS1R supports programmable dead time via the DT pin. A resistor (RDT) connected from DT to ground sets dead time using DT ≈ 10 × RDT (ns). For example, a 100 kΩ resistor yields ~1 µs dead time. The SI8231AB-AS1R also defaults to ~400 ps dead time if DT is left floating or tied to VDDI.
What are the UVLO thresholds for the SI8231AB-AS1R, and how do they affect system behavior?
The SI8231AB-AS1R has a 5 V UVLO threshold on VDDI, VDDA, and VDDB. If any supply falls below 5 V, its corresponding output is forced low. During startup, VOA and VOB remain low until VDDI exceeds 5 V for tSTART ≥ 10 µs. This ensures glitch-free initialization in automotive 12 V battery systems with transient dips.
Is the SI8231AB-AS1R pin-compatible with other Si823x variants like the SI8231BD-AS1R?
No, the SI8231AB-AS1R is not pin-compatible with SI8231BD-AS1R. While both are PWM-input high-side/low-side drivers, SI8231AB-AS1R uses a SOIC-16 narrow-body package with 2.5 kVRMS isolation, whereas SI8231BD-AS1R uses a SOIC-16 wide-body package rated for 5.0 kVRMS. Package dimensions and creepage differ, requiring PCB layout changes.
What automotive qualifications does the SI8231AB-AS1R hold, and what documentation is available?
The SI8231AB-AS1R is qualified to AEC-Q100 Grade 1 (–40 °C to +125 °C) with full AIAG-compliant PPAP documentation, IMDS and CAMDS material declarations, and zero-defect manufacturing flow. These qualifications are specific to the "-A" suffix and apply directly to the SI8231AB-AS1R part number as shipped.
SI8231AB-AS1R 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):
- 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
SI8231AB-AS1R FAQ
1.How can I place an order for SI8231AB-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231AB-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 SI8231AB-AS1R reliable?
The price and inventory of SI8231AB-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231AB-AS1R is usually 5 days.
3.What payment methods are accepted for SI8231AB-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231AB-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231AB-AS1R?
SI8231AB-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231AB-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 SI8231AB-AS1R?
For technical support, including SI8231AB-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231AB-AS1R requirements.
6.How does Aetrix verify that SI8231AB-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8231AB-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 SI8231AB-AS1R meets industry standards.
7.What is the process for return or replacement of SI8231AB-AS1R?
All SI8231AB-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8231AB-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 SI8231AB-AS1R part is unused and in its original packaging.
Return procedure for SI8231AB-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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