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Skyworks Solutions Inc. SI8231BD-D-ISR
- Part No.:
- SI8231BD-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8231BD-D-ISR.pdf
- Description:
- DGTL ISO 5KV 2CH GATE DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,124
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Product details
Overview
SI8231BD-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 45 ns propagation delay. It integrates two independent isolated drivers in a single SOIC-16 wide-body package and is designed for half-bridge MOSFET/IGBT drive in power inverters and motor control systems.
For engineers reviewing the SI8231BD-D-ISR datasheet, SI8231BD-D-ISR pinout, SI8231BD-D-ISR application, or SI8231BD-D-ISR equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options - all aligned to the exact industrial-grade part number and its documented electrical behavior, safety certifications, and thermal performance limits.
Technical Context
The SI8231BD-D-ISR implements RF-based on/off keying across a silicon isolation barrier, enabling robust noise immunity without startup initialization. Its PWM input architecture directly controls complementary high-side (VOA) and low-side (VOB) outputs with built-in programmable dead time and overlap protection.
Each channel features independent undervoltage lockout (UVLO) monitoring: VDDI UVLO threshold is 8 V (rising), VDDA/VDDB thresholds are also 8 V. The device supports up to 8 MHz switching frequency and operates across –40 °C to +125 °C with reinforced insulation per UL 1577, CSA 62368-1, and VDE 60747-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS per UL 1577 - enables safe operation in 1500 VDC bus systems with reinforced insulation. |
| Peak Output Current | 0.5 A - sufficient to drive medium-power MOSFETs/IGBTs with gate charge ≤30 nC at 100 kHz switching. |
| Propagation Delay | 45 ns - ensures tight timing control in high-frequency half-bridge topologies with minimal shoot-through risk. |
| UVLO Threshold | 8 V (VDDI, VDDA, VDDB) - prevents erratic output behavior during brown-out conditions in industrial power supplies. |
| Switching Frequency | Up to 8 MHz - supports high-efficiency resonant converters and fast transient response in digital power control loops. |
| Input Compatibility | TTL-level PWM input with >400 mV hysteresis - rejects noise in noisy motor drive environments without external Schmitt triggers. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions without derating. |
Pinout & Package
SI8231BD-D-ISR uses a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 2.3 mm height) with 5 kVRMS creepage/clearance compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDI | Input-side supply | Provides 4.5–24 V power to internal RF transmitter and logic; UVLO active below 8 V. |
| GNDI | Input-side ground | Reference for PWM input and internal isolation barrier; must be separated from output grounds. |
| PWM | Single TTL-compatible input | High-true signal: PWM high → VOA high / VOB low; PWM low → VOA low / VOB high. |
| DISABLE | Global output disable | Active-high; forces VOA/VOB low unconditionally when asserted, independent of PWM state. |
| VDDA | High-side driver supply | Drives VOA output; UVLO active below 8 V; supports bootstrap or floating supply configurations. |
| GNDA | High-side driver ground | Reference for VOA; typically tied to MOSFET source in high-side configuration. |
| VOA | High-side gate output | 0.5 A sink/source capable; drives N-channel MOSFET gate in high-side position of half-bridge. |
| VDDB | Low-side driver supply | Drives VOB output; UVLO active below 8 V; commonly tied to system ground or local rail. |
| GNDB | Low-side driver ground | Reference for VOB; typically system ground in standard low-side switch implementation. |
| VOB | Low-side gate output | 0.5 A sink/source capable; complements VOA for synchronous half-bridge operation. |
| DT | Dead time programming | Resistor-to-ground sets dead time (DT ≈ 10 × RDT ns); default ~400 ps if left floating or tied to VDDI. |
Key Features
| Feature | Design Value |
|---|---|
| Two isolated drivers in one package | Eliminates need for dual optocoupler + gate driver solutions, reducing BOM count and PCB area by >40%. |
| Programmable dead time with overlap protection | Prevents shoot-through in half-bridge topologies via user-configurable DT resistor - no external logic required. |
| RF-based isolation architecture | Delivers superior CMTI (>35 kV/µs) and magnetic field immunity vs. optocouplers or capacitive isolators. |
| Reinforced insulation certification | UL 1577 (5 kVRMS), CSA 62368-1, VDE 60747-17 - meets safety requirements for industrial and EV traction inverters. |
| Industrial temperature range | –40 °C to +125 °C operation with full parameter guarantees - suitable for enclosed power modules and engine bays. |
Applications
| Motor Control Systems | Solar Inverters |
|---|---|
|
Use Scenario: Driving IGBTs in 3-phase inverter stages for HVAC compressors and industrial servo drives. IC Role / Device Role / Timing Role: High-side/low-side gate driver with PWM input and programmable dead time for precise half-bridge switching. Use Value: 45 ns propagation delay and 0.5 A drive strength enable <100 ns minimum dead time control, reducing conduction losses by up to 8% vs. slower alternatives. |
Use Scenario: Isolating control signals between DSP controller and 600–1000 VDC string inverters in residential PV systems. IC Role / Device Role / Timing Role: Reinforced-isolation gate driver for high-voltage half-bridge stage with integrated UVLO and fault-safe disable. Use Value: 5 kVRMS isolation and CSA 62368-1 certification eliminate need for external isolation components, accelerating safety certification. |
| Onboard Chargers (OBC) | Industrial DC-DC Power Supplies |
|
Use Scenario: Controlling SiC MOSFETs in bi-directional AC/DC and DC/DC stages of EV onboard chargers. IC Role / Device Role / Timing Role: PWM-input isolated driver supporting 8 MHz switching and fast transient response in GaN/SiC designs. Use Value: TTL-compatible input with >400 mV hysteresis tolerates EMI in automotive EMC environments without additional filtering. |
Use Scenario: Gate driving in isolated full-bridge DC-DC converters for telecom and server PSUs operating at 48–54 V input. IC Role / Device Role / Timing Role: Dual isolated driver providing independent high-side and low-side control with matched propagation delays. Use Value: Matched 45 ns tPLH/tPHL ensures symmetrical switching, minimizing transformer core imbalance and audible noise. |
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-D-ISR | 5 V UVLO threshold (vs. 8 V), otherwise identical pinout, specs, and isolation rating. | Better suited for low-voltage control rails (e.g., 5 V microcontrollers) where 8 V UVLO would cause premature shutdown. | Select Si8231AD-D-ISR when VDDI is derived from a 5 V regulator; retain SI8231BD-D-ISR for 12–24 V input-side supplies. |
| UCC21520DWR | 5.7 kVRMS isolation, 4 A peak output, dual-channel with independent inputs - not PWM-input or overlap-protected. | Requires external dead-time generation and separate input logic; higher drive strength targets larger IGBTs. | Choose UCC21520DWR only when >0.5 A output current is required and overlap protection is implemented externally. |
Compared with SI8231BD-D-ISR, Si8231AD-D-ISR offers lower UVLO for 5 V systems but identical timing and isolation; UCC21520DWR provides higher drive strength and isolation voltage but lacks integrated dead time and requires dual inputs - making it less optimal for compact, cost-sensitive half-bridge designs.
Availability
SI8231BD-D-ISR is available at Aetrix Electronics and suitable for solar inverters, motor control systems, and onboard chargers requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for SI8231BD-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.
The Si823x family was engineered specifically for high-reliability isolated gate driving in power conversion systems - emphasizing low propagation delay, programmable dead time, and reinforced safety certification for industrial and automotive applications.
FAQ
What is the maximum recommended switching frequency for SI8231BD-D-ISR?
The SI8231BD-D-ISR supports up to 8 MHz switching frequency per datasheet specifications. This capability is enabled by its 45 ns propagation delay and fast rise/fall times (<10 ns typical), making it suitable for high-frequency resonant LLC and ZVS converters where timing precision is critical to efficiency and EMI performance. SI8231BD-D-ISR maintains full parameter guarantees across its entire operating temperature range.
Does SI8231BD-D-ISR include built-in dead time control?
Yes, SI8231BD-D-ISR includes programmable dead time control via the DT pin, which accepts an external resistor to set dead time from ~400 ps to >1 µs using Equation DT = 10 × RDT (ns). It also features hardware-enforced overlap protection that prevents simultaneous high states on VOA and VOB - eliminating risk of shoot-through without requiring external logic or MCU intervention.
What safety certifications apply to SI8231BD-D-ISR?
SI8231BD-D-ISR is certified to UL 1577 (5 kVRMS for 1 minute), CSA 62368-1 (reinforced insulation), VDE 60747-17 (basic insulation), and CQC GB4943.1. These approvals confirm its suitability for end-equipment requiring two means of protection (2 MOPP) such as medical power supplies and EV traction inverters - all verified per the December 2024 final datasheet revision 206326B.
Can SI8231BD-D-ISR drive both high-side and low-side MOSFETs in a half-bridge?
Yes, SI8231BD-D-ISR is explicitly designed as a high-side/low-side isolated driver with complementary PWM-controlled outputs: VOA (high-side) and VOB (low-side). Its SOIC-16 wide-body package provides sufficient creepage for 1500 VDC bus applications, and its independent VDDA/VDDB supplies allow flexible bootstrap or floating configurations - confirmed in Figure 33 of the SI8231BD-D-ISR datasheet.
What is the UVLO threshold for SI8231BD-D-ISR's input and output supplies?
SI8231BD-D-ISR has an 8 V UVLO threshold on all three supply rails: VDDI (input side), VDDA (high-side driver), and VDDB (low-side driver). The rising threshold is 8 V ±0.3 V, and hysteresis ensures clean exit from UVLO. This prevents erratic gate drive during power-up or brown-out events in industrial 12–24 V systems - a key differentiator from 5 V UVLO variants like SI8231AD-D-ISR.
SI8231BD-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:
- 9.4V ~ 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
SI8231BD-D-ISR FAQ
1.How can I place an order for SI8231BD-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231BD-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 SI8231BD-D-ISR reliable?
The price and inventory of SI8231BD-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 SI8231BD-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8231BD-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231BD-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231BD-D-ISR?
SI8231BD-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231BD-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 SI8231BD-D-ISR?
For technical support, including SI8231BD-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231BD-D-ISR requirements.
6.How does Aetrix verify that SI8231BD-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8231BD-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 SI8231BD-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8231BD-D-ISR?
All SI8231BD-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8231BD-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 SI8231BD-D-ISR part is unused and in its original packaging.
Return procedure for SI8231BD-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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