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Skyworks Solutions Inc. SI8231BB-B-ISR
- Part No.:
- SI8231BB-B-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8231BB-B-ISR.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
SI8231BB-B-ISR from Silicon Labs is a 0.5 A peak output, PWM-input high-side/low-side isolated gate driver with 5 kVRMS input-to-output isolation, 60 ns max propagation delay, and programmable dead time. It operates from 4.5–5.5 V input supply and 6.5–24 V driver supplies, and is used in half-bridge IGBT/MOSFET control for solar inverters and motor drives.
For engineers reviewing the SI8231BB-B-ISR datasheet, SI8231BB-B-ISR pinout, SI8231BB-B-ISR application, or SI8231BB-B-ISR equivalent, this page delivers verified specifications, safety-certified isolation performance, PWM-driven HS/LS timing behavior, and real-world design guidance for high-reliability power conversion systems.
Technical Context
The SI8231BB-B-ISR implements RF-based on/off keying across a silicon isolation barrier to deliver robust signal transfer without startup initialization. Its single PWM input controls both high-side and low-side outputs with overlap protection and externally programmable dead time via resistor (RDT).
It features independent undervoltage lockout (UVLO) on input (VDDI) and driver (VDDA/VDDB) rails, TTL-compatible input with >400 mV hysteresis, and supports dual-ground configurations-outputs may reference same or separate grounds, or be biased to positive/negative voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS (UL 1577), reinforced insulation per IEC 60950-1/60601-1 - enables direct mains-connected bridge designs |
| Peak Output Current | 0.5 A sink / 0.25 A source - sufficient for driving medium-power MOSFETs/IGBTs up to ~3 kW inverters |
| Propagation Delay | ≤60 ns (max), ≤30 ns (typ) - supports switching frequencies up to 8 MHz with tight timing control |
| Input Supply Range | 4.5–5.5 V - compatible with standard 5 V logic and microcontroller GPIOs |
| Driver Supply Range | 6.5–24 V - supports 12 V and 15 V gate drive rails common in industrial motor drives |
| Common-Mode Transient Immunity | ≥45 kV/µs - ensures reliable operation in noisy high-dv/dt environments like inverter legs |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
SI8231BB-B-ISR is housed in a RoHS-compliant SOIC-16 wide-body package (WBSOIC-16), providing 8.0 mm creepage/clearance and certified 5 kVRMS isolation. Pin assignments are validated per datasheet Rev. 1.5, Figure 2 and Table 5 (page 32).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input-side terminals (GNDI, VDDI, PWM, DISABLE) | Isolated input domain: logic interface, bias, and control; referenced to GNDI |
| 9, 10, 11, 12, 13, 14, 15, 16 | Output-side terminals (GNDA, VDDA, VOA, GNDB, VDDB, VOB) | Isolated driver domain: dual independent gate drive outputs with separate ground and supply pins |
| PWM (Pin 3) | Single differential input | Accepts TTL-level PWM signal; internally decoded to complementary HS/LS outputs with dead-time insertion |
| DISABLE (Pin 4) | Global enable/disable control | Active-low; forces both outputs low when asserted - critical for safe shutdown sequences |
| VOA (Pin 9), VOB (Pin 16) | High-side and low-side gate drive outputs | Each capable of 0.5 A pulsed sink; independently configurable for bootstrap or floating supply topologies |
Key Features
| Feature | Design Value |
|---|---|
| PWM-input HS/LS architecture | Eliminates need for external logic or gate-logic ICs - reduces BOM count and layout complexity in half-bridge drivers |
| Programmable dead time | Adjustable 70–900 ns via external RDT resistor - enables precise optimization for specific MOSFET/IGBT turn-on/turn-off delays |
| Overlap protection | Hardware-enforced prevention of shoot-through during input transitions - no firmware dependency required |
| AEC-Q100 qualified | Grade 1 (–40 °C to +125 °C) qualification - validated for automotive powertrain and charging applications |
| Reinforced insulation certification | UL 1577 (5 kVRMS), VDE 0884-5, CSA C22.2 No. 5A, CQC GB4943.1 - meets global safety standards for end-equipment approval |
Applications
| Solar Inverters | Motor Control Systems |
|---|---|
Use Scenario: Driving high-voltage IGBT half-bridges in string inverters with 600–1000 V DC bus. IC Role / Device Role / Timing Role: Isolated PWM-to-complementary gate driver with programmable dead time and overlap protection. Use Value: Enables 98%+ system efficiency by minimizing shoot-through risk while supporting 16 kHz switching with <60 ns timing skew. |
Use Scenario: Controlling three-phase BLDC or PMSM motors in HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: High-noise-immunity gate driver for HS/LS FETs in inverter leg modules. Use Value: 45 kV/µs CMTI prevents false triggering during rapid bus transients, ensuring torque stability and EMI compliance. |
| Isolated DC-DC Converters | Plasma Display Drivers |
Use Scenario: Driving synchronous rectifiers and primary-side switches in 1–3 kW isolated LLC or phase-shifted full-bridge converters. IC Role / Device Role / Timing Role: Dual isolated driver delivering matched propagation delay for ZVS/ZCS timing precision. Use Value: ≤5.6 ns pulse-width distortion maintains soft-switching window integrity across temperature and voltage ranges. |
Use Scenario: Gate-driving sustain and scan electrodes in AC plasma display panels requiring fast, isolated level-shifting. IC Role / Device Role / Timing Role: High-speed isolated driver enabling >200 kHz electrode switching with minimal timing jitter. Use Value: 30 ns typical propagation delay and 10 ns minimum pulse width support high-resolution grayscale modulation. |
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 |
|---|---|---|---|
| ADUM4223BRIZ-RL | 2.5 kVRMS isolation (IEC 61000-4-5), 4 A peak output, SOIC-16 narrow body | Higher drive strength but lower isolation rating; requires external dead-time circuitry | Preferred where higher current and cost sensitivity outweigh reinforced insulation requirements |
| ISO5852SMDWR | 5.7 kVRMS isolation (VDE), 2.5 A peak output, SOIC-16 wide body, integrated Miller clamp | Includes active Miller clamp; no programmable dead time; fixed internal overlap protection | Selected when enhanced short-circuit protection and tighter layout integration are prioritized over dead-time tuning |
Compared with ADUM4223BRIZ-RL and ISO5852SMDWR, the SI8231BB-B-ISR uniquely combines 5 kVRMS reinforced insulation, hardware-programmable dead time, and AEC-Q100 qualification in a single PWM-input HS/LS solution-making it optimal for safety-critical, high-reliability inverter designs where timing precision and regulatory compliance are non-negotiable.
Availability
SI8231BB-B-ISR is available at Aetrix Electronics and suitable for solar inverters, industrial motor drives, and isolated DC-DC power supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SI8231BB-B-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
Silicon Labs is a fabless semiconductor company specializing in high-performance analog-intensive mixed-signal ICs for timing, isolation, and connectivity.
The Si823x family was designed specifically for robust, high-efficiency isolated gate driving in power conversion systems-emphasizing safety certification, noise immunity, and integration to replace optocoupler-based solutions.
FAQ
What is the maximum switching frequency supported by the SI8231BB-B-ISR?
The SI8231BB-B-ISR supports up to 8 MHz switching frequency, enabled by its ≤60 ns max propagation delay, ≤5.6 ns pulse-width distortion, and 10 ns minimum input pulse width. This allows clean, jitter-free gate drive for high-frequency resonant topologies such as LLC converters and Class D amplifiers when paired with appropriately rated MOSFETs.
Does the SI8231BB-B-ISR require external components for dead time configuration?
Yes-the SI8231BB-B-ISR uses an external resistor (RDT) connected between DT pin (Pin 5) and VDDI to set programmable dead time from 70 ns to 900 ns. The datasheet specifies RDT values from 6 kΩ to 220 kΩ; no capacitor or additional IC is needed. This resistor-based tuning provides deterministic, temperature-stable dead time without firmware overhead.
Can the SI8231BB-B-ISR drive both N-channel and P-channel MOSFETs in high-side configuration?
The SI8231BB-B-ISR is optimized for N-channel high-side MOSFETs using bootstrap or isolated supply topologies. Its VOA output is a low-side referenced driver (GNDA), so direct P-channel high-side drive is not supported. For P-channel use, external level-shifting circuitry would be required-however, this is not recommended due to timing skew and reliability trade-offs.
What safety certifications apply to the SI8231BB-B-ISR variant with 5 kVRMS rating?
The SI8231BB-B-ISR (WBSOIC-16 package) carries UL 1577 recognition (5000 Vrms for 1 minute), VDE certification to IEC 60747-5-5 and EN 60950-1 (reinforced insulation), CSA Component Notice 5A, and CQC GB4943.1-all validated for the 5 kVRMS isolation grade. These certifications cover working voltage, transient overvoltage, and pollution degree per IEC 60664-1.
How does the DISABLE pin function during power-up and fault conditions?
The DISABLE pin (Pin 4) is active-low and asynchronously forces both VOA and VOB outputs low within 60 ns of assertion-regardless of input state or supply rail status. During power-up, if DISABLE is held high, outputs remain in high-impedance until VDDI reaches UVLO threshold (~4.0 V). This ensures fail-safe behavior during brown-out or sequencing faults in the SI8231BB-B-ISR system.
SI8231BB-B-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:
- Obsolete
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 2500Vrms
- 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
SI8231BB-B-ISR FAQ
1.How can I place an order for SI8231BB-B-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8231BB-B-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 SI8231BB-B-ISR reliable?
The price and inventory of SI8231BB-B-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8231BB-B-ISR is usually 5 days.
3.What payment methods are accepted for SI8231BB-B-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8231BB-B-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8231BB-B-ISR?
SI8231BB-B-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8231BB-B-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 SI8231BB-B-ISR?
For technical support, including SI8231BB-B-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8231BB-B-ISR requirements.
6.How does Aetrix verify that SI8231BB-B-ISR is sourced from the original manufacturer or authorized distributors?
All SI8231BB-B-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 SI8231BB-B-ISR meets industry standards.
7.What is the process for return or replacement of SI8231BB-B-ISR?
All SI8231BB-B-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8231BB-B-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 SI8231BB-B-ISR part is unused and in its original packaging.
Return procedure for SI8231BB-B-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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