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Skyworks Solutions Inc. SI8231AD-D-ISR
- Part No.:
- SI8231AD-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8231AD-D-ISR.pdf
- Description:
- DGTL ISO 5KV 2CH GATE DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,121
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Product details
Overview
SI8231AD-D-ISR from Skyworks Solutions is a high-side/low-side isolated gate driver IC with PWM input, 0.5 A peak output current, 5 kVRMS isolation rating, and 5 V undervoltage lockout (UVLO) threshold. It integrates two independent isolated drivers in a single SOIC-16 wide-body package and is designed for half-bridge MOSFET/IGBT control in industrial inverters and onboard chargers.
For engineers reviewing the SI8231AD-D-ISR datasheet, SI8231AD-D-ISR pinout, SI8231AD-D-ISR application, or SI8231AD-D-ISR equivalent, this page delivers verified technical context, real-world timing behavior, isolation compliance evidence, and precise alternative part comparisons - all grounded in Skyworks' official Si823x family documentation dated December 2024.
Technical Context
The SI8231AD-D-ISR implements RF-based on/off keying across a proprietary silicon isolation barrier, delivering 45 ns typical propagation delay and immunity to magnetic fields and EMI. Its single PWM input controls complementary high-side (VOA) and low-side (VOB) outputs with built-in programmable dead time and overlap protection.
It features independent UVLO monitoring on input (VDDI), high-side (VDDA), and low-side (VDDB) supplies, with outputs defaulting low during undervoltage conditions. The device supports up to 8 MHz switching frequency and operates across –40 °C to +125 °C with RoHS-compliant reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS per UL1577 - enables reinforced insulation in 1500 VDC systems like solar inverters and traction drives |
| Peak Output Current | 0.5 A - sufficient to drive small-to-medium IGBTs and MOSFETs with <10 nC gate charge in half-bridge topologies |
| Propagation Delay | 45 ns typical - ensures tight timing alignment between high-side and low-side switching for reduced shoot-through risk |
| UVLO Threshold | 5 V (VDDI) - prevents erratic operation during brown-out conditions common in automotive battery-supplied systems |
| Switching Frequency | Up to 8 MHz - supports high-frequency resonant converters and digital power control loops |
| Input Compatibility | TTL-level PWM input with >400 mV hysteresis - rejects noise in noisy motor control environments without external Schmitt triggers |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive applications including onboard chargers and BMS |
Pinout & Package
SI8231AD-D-ISR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.65 mm height) with 8.3 mm creepage and clearance, optimized for 5 kVRMS isolation integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side supply | Provides 4.5–5.5 V power to internal RF transmitter; enables UVLO monitoring at 5 V threshold |
| GNDI | Input-side ground | Reference for PWM input and internal oscillator; galvanically isolated from output grounds |
| PWM | Single logic input | TTL-compatible signal controlling complementary VOA/VOB outputs; >400 mV hysteresis improves noise margin |
| DISABLE | Global shutdown control | Active-high signal forcing both outputs low within tSD; resumes operation within tRESTART after deassertion |
| VDDA | High-side driver supply | Supplies 12–24 V to high-side output stage; includes independent UVLO (VDDAUV–/VDDAUV+) |
| GNDA | High-side ground reference | Local return for VOA; floats with high-side switch node - requires proper bootstrap or isolated bias design |
| VOA | High-side gate drive output | Sinks/source 0.5 A peak; drives gate of high-side MOSFET/IGBT referenced to GNDA |
| VDDB | Low-side driver supply | Supplies 12–24 V to low-side output stage; includes independent UVLO (VDDBUV–/VDDBUV+) |
| GNDB | Low-side ground reference | System ground reference for VOB; typically connected to power stage source/common emitter |
| VOB | Low-side gate drive output | Sinks/source 0.5 A peak; drives gate of low-side MOSFET/IGBT 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 |
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 external resistor (RDT) - enables precise tuning to match gate driver timing and prevent shoot-through |
| Independent UVLO per supply rail | Prevents partial operation: VDDI, VDDA, and VDDB each monitored separately to ensure safe startup/shutdown sequencing |
| Complementary PWM-controlled outputs | Single-input logic simplifies controller interface while maintaining strict high-side/low-side phase relationship |
| AEC-Q100 qualified (automotive-grade variant) | SI8231AD-D-ISR's automotive counterpart (SI8231AD-AS) meets Grade 1 requirements - validates robustness for EV powertrain use |
Applications
| Industrial Inverters | Solar Power Conversion |
|---|---|
Use Scenario: Half-bridge switching in 3-phase motor drives for HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: High-side/low-side gate driver with programmable dead time ensuring shoot-through prevention during 10–20 kHz PWM operation. Use Value: 45 ns propagation delay and 5 kVRMS isolation enable reliable operation in 600–1200 V DC-link systems with minimal timing skew. |
Use Scenario: Isolated gate driving in string inverters and microinverters interfacing PV arrays to grid. IC Role / Device Role / Timing Role: PWM-controlled isolated driver enabling synchronous rectification and MPPT control in bidirectional DC-DC stages. Use Value: TTL-compatible input and 5 V UVLO support direct connection to MCU GPIOs; SOIC-16 WB package meets IPC-2221 creepage requirements for 1000 VAC grid tie. |
| Onboard Chargers (OBC) | Battery Management Systems (BMS) |
Use Scenario: Driving high-frequency GaN FETs in AC-DC PFC and DC-DC LLC stages of EV onboard chargers. IC Role / Device Role / Timing Role: Isolated high-side/low-side driver supporting 500 kHz–1 MHz switching with precise dead time control. Use Value: 8 MHz max switching frequency and 0.5 A output capability match fast-switching GaN requirements while maintaining safety isolation. |
Use Scenario: Controlling active balancing switches and isolation relays in high-voltage battery packs (400–800 V). IC Role / Device Role / Timing Role: Safe, isolated gate driver for N-channel MOSFETs used in cell-level balancing circuits. Use Value: 5 kVRMS rating and –40 °C to +125 °C operation ensure reliability in thermally demanding pack environments with high voltage gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side/low-side isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8231BD-D-ISR | 8 V UVLO threshold instead of 5 V; otherwise identical pinout, isolation, and timing specs | Better suited for systems with stable 12–24 V input rails where tighter UVLO margin is unnecessary | Select SI8231BD-D-ISR if system VDDI is regulated above 8 V and higher UVLO hysteresis is preferred |
| UCC21520DWR | 5.7 kVRMS isolation, dual 4-A outputs, 35-V VDDA/VDDB max, no programmable dead time | Targets higher-power IGBT/MOSFETs requiring >2 A drive; lacks integrated DT control but offers higher CMTI (>150 kV/µs) | Choose UCC21520DWR when driving larger gate charges or when TI's ecosystem and layout guidance are prioritized over dead time tuning |
Compared with SI8231AD-D-ISR, SI8231BD-D-ISR trades lower UVLO sensitivity for higher rail margin, while UCC21520DWR sacrifices programmable dead time for higher drive strength and CMTI - making SI8231AD-D-ISR optimal for cost-sensitive, medium-power automotive and industrial half-bridges needing precise timing control.
Availability
SI8231AD-D-ISR is available at Aetrix Electronics and suitable for industrial inverters, solar power conversion, and onboard chargers requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.
Supply support for SI8231AD-D-ISR 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 communications, automotive, and industrial markets.
The Si823x family was engineered specifically for isolated gate driving in high-reliability power conversion systems - emphasizing robustness, timing precision, and regulatory compliance (UL, VDE, CSA) across automotive and industrial operating environments.
FAQ
What is the isolation voltage rating of the SI8231AD-D-ISR and which safety standards does it meet?
The SI8231AD-D-ISR provides 5.0 kVRMS input-to-output isolation per UL 1577, certified for reinforced insulation under CSA 62368-1 and GB4943.1, and meets VDE 60747-17 for basic insulation. This rating supports its use in 1500 VDC systems such as solar inverters and EV traction stages, where creepage and clearance must withstand transient overvoltages.
Does the SI8231AD-D-ISR support programmable dead time, and how is it configured?
Yes, the SI8231AD-D-ISR supports programmable dead time via an external resistor (RDT) connected from the DT pin to ground. Dead time is calculated as DT ≈ 10 × RDT (ns); for example, a 100 kΩ resistor sets ~1 µs dead time. A 0.1 µF ceramic capacitor placed near the DT pin enhances noise immunity. Floating the DT pin yields ~400 ps nominal dead time.
What is the function of the DISABLE pin on the SI8231AD-D-ISR?
The DISABLE pin on the SI8231AD-D-ISR is an active-high control that forces both VOA and VOB outputs low regardless of PWM state, terminating driver operation within tSD (typically <100 ns). Operation resumes within tRESTART (~1 µs) after DISABLE returns low. It remains inactive if VDDI is below UVLO, ensuring fail-safe behavior during power loss.
How does the SI8231AD-D-ISR handle undervoltage conditions on its supply rails?
The SI8231AD-D-ISR implements independent UVLO monitoring on VDDI (5 V threshold), VDDA, and VDDB. When any supply falls below its respective UVLO– level, the corresponding output is held low. Outputs remain low until all monitored rails exceed their UVLO+ thresholds and stabilize - preventing partial or undefined switching states during brown-outs or startup.
Is the SI8231AD-D-ISR pin-compatible with other Si823x variants, and what are the key compatibility constraints?
SI8231AD-D-ISR is pin-compatible with all Si823x SOIC-16 wide-body variants (e.g., SI8231BD-D-ISR, SI8234AD-D-ISR) sharing the same configuration (PWM-input, high-side/low-side). Key constraints include matching UVLO threshold (5 V vs. 8 V), peak current (0.5 A vs. 4.0 A), and isolation rating (5 kVRMS vs. 2.5/3.75 kVRMS) - electrical substitution requires verification of these parameters in the target application.
SI8231AD-D-ISR 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:
- 5000Vrms
- 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:
- 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, UR, VDE
SI8231AD-D-ISR FAQ
1.How can I place an order for SI8231AD-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231AD-D-ISR 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 SI8231AD-D-ISR reliable?
The price and inventory of SI8231AD-D-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231AD-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8231AD-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231AD-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231AD-D-ISR?
SI8231AD-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231AD-D-ISR 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 SI8231AD-D-ISR?
For technical support, including SI8231AD-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231AD-D-ISR requirements.
6.How does Aetrix verify that SI8231AD-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8231AD-D-ISR 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 SI8231AD-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8231AD-D-ISR?
All SI8231AD-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8231AD-D-ISR, 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 SI8231AD-D-ISR part is unused and in its original packaging.
Return procedure for SI8231AD-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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