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Skyworks Solutions Inc. SI8231AB-ASR
- Part No.:
- SI8231AB-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8231AB-ASR.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,768
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Product details
Overview
SI8231AB-ASR from Skyworks Solutions is a high-side/low-side isolated 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 independent isolated drivers for half-bridge MOSFET/IGBT control in automotive onboard chargers and industrial inverters.
For engineers reviewing the SI8231AB-ASR datasheet, SI8231AB-ASR pinout, SI8231AB-ASR application, or SI8231AB-ASR equivalent, this page delivers verified technical context, real-world timing behavior, automotive-grade qualification status (AEC-Q100), and precise dead-time programmability details critical for functional safety-compliant power stage design.
Technical Context
The SI8231AB-ASR implements RF-based on/off keying modulation across a silicon isolation barrier, delivering 45 ns typical propagation delay and robust immunity to magnetic fields and EMI. Its single PWM input drives complementary high-side and low-side outputs with built-in overlap protection and user-programmable dead time via external resistor.
It features independent undervoltage lockout (UVLO) on input (VDDI), high-side (VDDA), and low-side (VDDB) supplies, with 5 V UVLO threshold and automatic output disable during fault conditions. The device operates from –40 °C to +125 °C and supports up to 8 MHz switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS per UL1577 - enables reinforced insulation in 400 VAC systems with 1500 VDC driver-to-driver differential voltage tolerance |
| Peak Output Current | 0.5 A - sufficient to drive standard 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 outputs for reduced shoot-through risk |
| UVLO Threshold | 5 V (VDDI) - prevents erratic operation during brown-out conditions in automotive 12 V supply rails |
| Dead Time Control | Programmable via RDT resistor - allows precise tuning of turn-off/turn-on delay (e.g., 100 ns to 1 µs) to match gate driver loop dynamics |
| Switching Frequency | Up to 8 MHz - supports high-frequency resonant topologies including LLC and GaN-based converters |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for onboard chargers and battery management systems |
Pinout & Package
SI8231AB-ASR uses a RoHS-compliant SOIC-16 narrow body package (5.3 mm × 10.3 mm, 1.0 mm height) with creepage ≥5.5 mm and clearance ≥5.0 mm per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input-side ground and supply | GNDI and VDDI pins support 4.5–5.5 V logic supply; TTL-compatible PWM input referenced to GNDI |
| 9, 10 | PWM input & DISABLE | PWM pin accepts 0–5 V logic; DISABLE pin forces both outputs low when high - critical for fault shutdown in ISO 26262 ASIL-B designs |
| 11, 12, 13, 14 | Output-side supplies and grounds | VDDA/GNDA for high-side driver; VDDB/GNDB for low-side driver - each with independent UVLO monitoring |
| 15, 16 | Outputs | VOA (high-side) and VOB (low-side) deliver complementary 0.5 A sink/source - directly interface with MOSFET gates without external buffers |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and CMTI limitations of optocouplers; achieves >100 kV/µs common-mode transient immunity |
| Programmable dead time | Configurable via single resistor (RDT) - avoids fixed-delay compromises and enables adaptive timing for varying load conditions |
| Independent UVLO per domain | Prevents partial operation: VOA/VOB remain low if VDDI, VDDA, or VDDB falls below 5 V - essential for fail-safe motor control |
| Automotive-grade qualification | AEC-Q100 Rev G compliant with PPAP documentation, IMDS/CAMDS support, and zero-defect manufacturing flow |
| TTL-compatible PWM input | Accepts standard microcontroller PWM signals without level-shifting - reduces BOM count and layout complexity |
Applications
| Onboard Charger (OBC) | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolated half-bridge driving in 6.6 kW AC/DC converter stage of EV onboard charger. IC Role / Device Role / Timing Role: SI8231AB-ASR provides synchronized, overlap-protected gate drive to high-voltage SiC MOSFETs with 45 ns propagation matching. Use Value: Enables 96%+ efficiency at 100 kHz switching while meeting ISO 26262 ASIL-B diagnostic coverage requirements via integrated UVLO and DISABLE. |
Use Scenario: Cell-balancing switch control in high-voltage traction battery pack with distributed isolation domains. IC Role / Device Role / Timing Role: SI8231AB-ASR isolates MCU PWM signals to drive discrete balancing FETs across 100+ cell modules. Use Value: 2.5 kVRMS isolation and AEC-Q100 qualification ensure long-term reliability under thermal cycling and vibration stress in automotive environments. |
| Solar Inverter DC-Link | Industrial Motor Drive |
|
Use Scenario: High-side/low-side gate drive for IGBTs in string-level solar inverter H-bridge output stage. IC Role / Device Role / Timing Role: SI8231AB-ASR delivers matched timing and programmable dead time to prevent shoot-through during MPPT transients. Use Value: 8 MHz max switching capability supports advanced soft-switching schemes that reduce EMI and improve PV yield by 1.2% annually. |
Use Scenario: Isolated gate drive in variable-frequency drive for HVAC compressors operating at 40–120 Hz. IC Role / Device Role / Timing Role: SI8231AB-ASR interfaces with DSP PWM outputs to control 600 V IGBTs in three-phase inverter leg. Use Value: SOIC-16 narrow body footprint enables compact PCB layout in space-constrained industrial enclosures while maintaining 5.5 mm creepage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side/low-side isolated gate drive applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8231BB-ASR | Same PWM-input HS/LS architecture but 2.5 kVRMS isolation in SOIC-16 wide body package with 8 V UVLO | Preferred for industrial systems requiring higher creepage (≥8 mm) and wider supply margin during brown-out | Select Si8231BB-ASR when board-level isolation distance exceeds 5.5 mm or input rail stability is marginal |
| UCC21520DWR | TI dual-channel isolated driver with 5 kVRMS, 4 A peak, and split-output architecture - no integrated dead-time control | Requires external dead-time generation circuitry; suited for high-current SiC designs where 0.5 A is insufficient | Choose UCC21520DWR only when >2 A peak gate current or 5 kVRMS is mandatory - adds design complexity vs. SI8231AB-ASR's integrated solution |
Compared with Si8231BB-ASR, SI8231AB-ASR offers tighter UVLO (5 V vs. 8 V) for automotive 12 V rail compatibility and narrower SOIC footprint; versus UCC21520DWR, it trades peak current for lower cost, smaller size, and built-in dead-time programming - ideal for cost-sensitive 6.6 kW OBCs.
Availability
SI8231AB-ASR is available at Aetrix Electronics and suitable for automotive onboard chargers, battery management systems, and solar inverters requiring stable component supply with full AEC-Q100 traceability and PPAP documentation.
Supply support for SI8231AB-ASR 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 communications markets.
The Si823x family was designed specifically for isolated gate driving in high-reliability power conversion systems, emphasizing automotive qualification, noise immunity, and integration of safety-critical functions like programmable dead time and multi-domain UVLO.
FAQ
What is the isolation voltage rating of the SI8231AB-ASR and which safety standards does it meet?
The SI8231AB-ASR has a 2.5 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 supports use in 400 VAC mains-connected systems with appropriate system-level creepage/clearance design. The SI8231AB-ASR is not rated for 5 kVRMS applications - that requires variants like SI8231BD-ASR.
Does the SI8231AB-ASR support programmable dead time, and how is it configured?
Yes, the SI8231AB-ASR supports programmable dead time via an external resistor (RDT) connected from the DT pin to ground. Using Equation 1 (DT ≈ 10 × RDT), a 10 kΩ resistor yields ~100 ns dead time. The DT pin may be tied to VDDI or left floating for ~400 ps nominal delay. A 0.1 µF ceramic capacitor must be placed near the DT pin for noise immunity. This feature is integral to the SI8231AB-ASR's overlap protection function.
What is the UVLO threshold for the SI8231AB-ASR, and how does it behave during power-up?
The SI8231AB-ASR has a 5 V UVLO threshold on VDDI, VDDA, and VDDB supplies. During power-up, outputs VOA and VOB remain low until all three supplies exceed 5 V for tSTART (typically <10 µs). If any supply drops below 5 V during operation, its corresponding output is forced low while others remain active - a behavior confirmed in the SI8231AB-ASR truth table and startup sequence diagrams.
Is the SI8231AB-ASR qualified for automotive applications, and what documentation is available?
Yes, the SI8231AB-ASR is AEC-Q100 qualified and designated as an automotive-grade part (suffix "-A"). It includes AIAG-compliant PPAP documentation, IMDS and CAMDS material declarations, and zero-defect manufacturing process controls. These qualifications are explicitly stated in Skyworks' Si823x Ordering Guide and apply identically to the SI8231AB-ASR tape-and-reel variant (suffix "-ASR").
Can the SI8231AB-ASR drive both high-side and low-side switches simultaneously, and how is overlap prevented?
Yes, the SI8231AB-ASR drives high-side (VOA) and low-side (VOB) outputs complementarily from a single PWM input. Overlap is prevented by integrated hardware-based overlap protection and user-programmable dead time. When enabled, the SI8231AB-ASR guarantees that one output transitions fully before the other begins - verified in Figure 32 of the datasheet and enforced regardless of input timing skew or noise.
SI8231AB-ASR 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):
- 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-ASR FAQ
1.How can I place an order for SI8231AB-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231AB-ASR 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-ASR reliable?
The price and inventory of SI8231AB-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231AB-ASR is usually 5 days.
3.What payment methods are accepted for SI8231AB-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231AB-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231AB-ASR?
SI8231AB-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231AB-ASR 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-ASR?
For technical support, including SI8231AB-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231AB-ASR requirements.
6.How does Aetrix verify that SI8231AB-ASR is sourced from the original manufacturer or authorized distributors?
All SI8231AB-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8231AB-ASR?
All SI8231AB-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8231AB-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8231AB-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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