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Skyworks Solutions Inc. SI8235BB-D-ISR
- Part No.:
- SI8235BB-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8235BB-D-ISR.pdf
- Description:
- DGTL ISO 2.5KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,176
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Product details
Overview
SI8235BB-D-ISR from Skyworks Solutions is a dual-channel isolated gate driver IC with 4.0 A peak output current per channel, 2.5 kVRMS input-to-output isolation, and SOIC-16 narrow-body package. It features independent TTL-compatible inputs (VIA/VIB), no internal dead time, and operates across –40°C to +125°C for isolated MOSFET/IGBT drive in half-bridge and dual-switch topologies.
For engineers reviewing the SI8235BB-D-ISR datasheet, SI8235BB-D-ISR pinout, SI8235BB-D-ISR application, or SI8235BB-D-ISR equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in solar inverters and motor control, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The SI8235BB-D-ISR implements two fully isolated driver channels using Skyworks' proprietary silicon RF isolation barrier, enabling independent high-side and low-side switching without shared ground constraints. Each channel supports up to 4.0 A peak source/sink current, 8 MHz max switching frequency, and operates with VDDA/VDDB supply voltages up to 24 V.
Unlike HS/LS variants (e.g., SI8233BB-D-IS), the SI8235BB-D-ISR lacks programmable dead time and overlap protection - its truth table confirms immediate, independent output transitions on VIA/VIB inputs. UVLO thresholds are fixed at 8 V (VDDI) and 8 V (VDDA/VDDB), with outputs defaulting low during undervoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS per UL1577 - enables safe operation between primary and secondary domains in 600 V-class power stages. |
| Peak Output Current | 4.0 A per channel - drives high-gate-charge IGBTs and SiC MOSFETs without external buffers in 3–10 kW inverters. |
| Propagation Delay | ≤45 ns - ensures tight timing alignment between dual outputs for synchronous switching in resonant converters. |
| Supply Voltage Range | VDDI/VDDA/VDDB = 4.5–24 V - supports direct connection to 5 V logic and 12–15 V gate drive rails without LDOs. |
| UVLO Threshold | 8 V (rising), 7.5 V (falling) - prevents erratic gate drive during brown-out conditions in industrial power supplies. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive traction inverter gate drive and industrial motor drives. |
| Package | SOIC-16 narrow body - 10.3 mm × 7.5 mm footprint with 0.05-inch pitch, compatible with standard SMT reflow profiles (260°C peak). |
Pinout & Package
SI8235BB-D-ISR uses a RoHS-compliant SOIC-16 narrow-body package (JEDEC MS-012AC) with creepage ≥5.5 mm and clearance ≥4.5 mm. Pin 1 is marked with a dot; pin numbering follows standard SOIC convention (counterclockwise from pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIA) | Input A signal | TTL-compatible logic input controlling VOA; 400 mV hysteresis prevents noise-induced toggling. |
| 2 (GNDI) | Input-side ground | Reference for VIA/VIB/DISABLE; galvanically isolated from GNDA/GNDB. |
| 3 (VDDI) | Input-side supply | 4.5–24 V power for internal RF transmitter; UVLO active below 7.5 V. |
| 4 (DISABLE) | Global disable control | Active-high; forces both VOA and VOB low within 100 ns when asserted. |
| 5 (VIB) | Input B signal | TTL-compatible logic input controlling VOB; independent of VIA with no cross-coupling. |
| 6 (NC) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines. |
| 7 (GNDA) | Driver A ground | Return path for VOA output; isolated from GNDI and GNDB. |
| 8 (VOA) | Output A driver | 4.0 A peak source/sink; drives high-side switch gate with rail-to-rail swing (VDDA–0.5 V to GNDA). |
| 9 (VDDA) | Driver A supply | 4.5–24 V gate drive rail for VOA; UVLO active if <7.5 V. |
| 10 (NC) | No connect | Internally unconnected; must remain floating or grounded. |
| 11 (GNDB) | Driver B ground | Return path for VOB output; isolated from GNDI and GNDA. |
| 12 (VOB) | Output B driver | 4.0 A peak source/sink; drives low-side switch gate with rail-to-rail swing (VDDB–0.5 V to GNDB). |
| 13 (VDDB) | Driver B supply | 4.5–24 V gate drive rail for VOB; UVLO active if <7.5 V. |
| 14 (NC) | No connect | Internally unconnected; must remain floating or grounded. |
| 15 (NC) | No connect | Internally unconnected; must remain floating or grounded. |
| 16 (NC) | No connect | Internally unconnected; must remain floating or grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent isolated drivers | Two fully isolated 4.0 A gate drivers in one SOIC-16 package - eliminates need for two discrete isolators in dual-switch designs. |
| Silicon RF isolation barrier | 2.5 kVRMS withstand voltage with 45 ns propagation delay - superior EMI immunity vs. optocouplers and higher reliability than capacitive isolators. |
| TTL-compatible inputs with hysteresis | 400 mV input hysteresis on VIA/VIB - rejects ±200 mV noise on PCB traces without external Schmitt triggers. |
| Independent UVLO per domain | Separate UVLO monitoring on VDDI, VDDA, and VDDB - prevents partial drive failure during asymmetric rail collapse. |
| Robust disable function | Asynchronous active-high DISABLE pin forcing both outputs low in ≤100 ns - enables fast fault shutdown in overcurrent events. |
Applications
| Motor Control Systems | Solar Inverters |
|---|---|
Use Scenario: Driving dual IGBTs in three-phase inverter legs for HVAC compressors and industrial servo drives. IC Role / Device Role / Timing Role: Dual isolated gate driver providing independent, synchronized turn-on/turn-off control for high-side and low-side switches in each phase leg. Use Value: 4.0 A peak current directly drives 1200 V IGBT gates with <45 ns skew, enabling >16 kHz PWM without external buffers and reducing thermal stress on gate resistors. |
Use Scenario: Controlling H-bridge and DC-link switches in string-level solar inverters operating at 1000 V DC bus. IC Role / Device Role / Timing Role: Isolated dual driver enabling floating high-side gate drive and low-side sensing in transformerless inverter topologies. Use Value: 2.5 kVRMS isolation meets IEC 62109 requirements for PV system safety; SOIC-16 narrow body fits compact heatsink-mounted layouts. |
| Industrial UPS | Onboard EV Chargers |
Use Scenario: Bidirectional switching in double-conversion UPS inverters requiring fast, reliable gate drive under transient load steps. IC Role / Device Role / Timing Role: Dual-channel isolated driver delivering matched timing and robust noise immunity in 48 V–400 V DC-AC conversion stages. Use Value: Independent UVLO on all three supply domains ensures fail-safe shutdown during AC line sags or battery voltage drops, preventing shoot-through. |
Use Scenario: Gate driving SiC MOSFETs in 11 kW bidirectional OBCs with 800 V battery architecture. IC Role / Device Role / Timing Role: High-current isolated driver supporting 100+ kHz switching in CLLC resonant converters with precise timing control. Use Value: 45 ns propagation delay and <5 ns channel-to-channel skew enable ZVS optimization; –40°C to +125°C rating supports under-hood mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8235BD-D-IS | 5.0 kVRMS isolation, SOIC-16 wide-body package, same 4.0 A output and pinout. | Required for reinforced insulation in medical (60601-1) and industrial safety-critical systems where 2.5 kVRMS is insufficient. | Select SI8235BD-D-IS when creepage/clearance >8.3 mm and 5 kVRMS UL1577 certification are mandated by end-equipment standards. |
| UCC5390SCD | Single-channel, 10 A peak output, 5 kVRMS, integrated Miller clamp and active pull-down; different pinout and control logic. | Targeted at high-reliability SiC gate drive with enhanced fault protection; not drop-in due to single-channel architecture and added features. | Choose UCC5390SCD only when designing new layouts with SiC MOSFETs requiring active miller clamping and >5 A drive capability per switch. |
Compared with SI8235BD-D-IS, SI8235BB-D-ISR offers lower isolation rating but smaller footprint and cost advantage for non-medical 600 V applications; versus UCC5390SCD, it provides dual-channel simplicity and proven field reliability in IGBT-based inverters without added complexity.
Availability
SI8235BB-D-ISR is available at Aetrix Electronics and suitable for solar inverters, industrial motor drives, and onboard EV chargers requiring stable component supply, long-term manufacturability, and automotive-grade traceability.
Supply support for SI8235BB-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, isolation, and precision timing technologies.
The Si823x family was designed specifically for isolated gate drive in high-efficiency power conversion systems - emphasizing low propagation delay, high noise immunity, and AEC-Q100 qualification for automotive traction inverters and industrial motor controls.
FAQ
What is the maximum switching frequency supported by the SI8235BB-D-ISR?
The SI8235BB-D-ISR supports up to 8 MHz switching frequency, enabled by its 45 ns typical propagation delay and <5 ns channel-to-channel skew. This allows clean, jitter-free gate drive in high-frequency resonant topologies like LLC and CLLC converters used in modern 11 kW onboard EV chargers and telecom rectifiers. The SI8235BB-D-ISR maintains timing integrity across temperature and supply voltage variations, making it suitable for designs targeting >500 kHz fundamental switching.
Does the SI8235BB-D-ISR include built-in dead time or overlap protection?
No, the SI8235BB-D-ISR does not include programmable dead time or overlap protection - those features are exclusive to the high-side/low-side variants (e.g., SI8233BB-D-IS). As a dual-driver part, SI8235BB-D-ISR provides independent, immediate output transitions on VIA and VIB inputs with no internal delay. Dead time must be implemented externally via controller-level timing or gate resistor networks when used in half-bridge configurations.
What are the UVLO thresholds for the SI8235BB-D-ISR inputs and outputs?
The SI8235BB-D-ISR has three independent UVLO monitors: VDDI UVLO+ = 8.0 V / UVLO− = 7.5 V; VDDA UVLO+ = 8.0 V / UVLO− = 7.5 V; VDDB UVLO+ = 8.0 V / UVLO− = 7.5 V. All outputs (VOA/VOB) are forced low when their respective supply falls below UVLO−, and remain latched low until the supply exceeds UVLO+. This ensures fail-safe behavior during brown-out conditions in industrial power supplies and automotive battery fluctuations.
Can the SI8235BB-D-ISR drive SiC MOSFETs directly?
Yes, the SI8235BB-D-ISR can directly drive most discrete SiC MOSFETs requiring ≤4.0 A peak gate current, such as 1200 V/40 mΩ devices used in 11 kW OBCs. Its 45 ns propagation delay, rail-to-rail output swing (VDDA–0.5 V to GNDA), and −40°C to +125°C operation meet key SiC gate drive requirements. However, for >4.0 A gate charge or enhanced Miller clamping, external buffer stages or parts like UCC5390SCD may be needed.
Is the SI8235BB-D-ISR qualified for automotive applications?
The SI8235BB-D-ISR itself is an industrial-grade part (suffix "-I"), but its automotive-grade counterpart SI8235BB-AS is AEC-Q100 qualified and manufactured with full automotive process flows, PPAP documentation, and IMDS/CAMDS compliance. For automotive designs - especially onboard chargers and traction inverters - SI8235BB-AS must be specified; SI8235BB-D-ISR is intended for industrial and commercial applications where AEC-Q100 is not required.
SI8235BB-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:
- 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):
- 12ns, 12ns (Max)
- Current - Output High, Low:
- 2A, 4A
- Current - Peak Output:
- 4A
- 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
SI8235BB-D-ISR FAQ
1.How can I place an order for SI8235BB-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8235BB-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 SI8235BB-D-ISR reliable?
The price and inventory of SI8235BB-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 SI8235BB-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8235BB-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8235BB-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8235BB-D-ISR?
SI8235BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8235BB-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 SI8235BB-D-ISR?
For technical support, including SI8235BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8235BB-D-ISR requirements.
6.How does Aetrix verify that SI8235BB-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8235BB-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 SI8235BB-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8235BB-D-ISR?
All SI8235BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8235BB-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 SI8235BB-D-ISR part is unused and in its original packaging.
Return procedure for SI8235BB-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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