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Skyworks Solutions Inc. SI8751AB-IS
- Part No.:
- SI8751AB-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8751AB-IS.pdf
- Description:
- DGTL ISO 2.5KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
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Product details
Overview
SI8751AB-IS from Skyworks Solutions is an isolated FET driver with digital CMOS input, designed to replace mechanical relays and optocoupler-based SSRs in industrial control systems. It delivers 10 V gate drive output using only 1 mA input current, supports –40 to +105 °C operation, features 2.5 kVRMS isolation, and integrates Active Miller Clamp for robust dV/dt immunity in motor and valve switching applications.
For engineers reviewing the SI8751AB-IS datasheet, SI8751AB-IS pinout, SI8751AB-IS application, or SI8751AB-IS equivalent, this page provides verified technical context, SOIC-8 package mapping, real-world timing performance (e.g., 85.3 µs turn-on at 90% VG(ON)), isolation certification details (UL/CSA/VDE/CQC), and validated alternative options for solid-state relay design.
Technical Context
The SI8751AB-IS uses RF-based CMOS isolation to transmit signal and power across a semiconductor barrier-eliminating need for external isolated supply. Its input side accepts 2.25–5.5 V digital logic, while TT pin enables adjustable input current (1.5–13.8 mA) to trade off between power consumption and turn-on speed.
On the output side, it generates a self-contained gate drive voltage referenced to SOURCE, supporting both DC load switching (single FET) and AC load switching (dual FET). The integrated Active Miller Clamp activates via MCAP1/MCAP2 pins when dV/dt exceeds threshold, providing low-impedance gate-to-source discharge to prevent unintended FET turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS - certified for reinforced insulation per UL1577, CSA C22.2 No. 60950-1, VDE 0884-10, and GB4943.1-2011 |
| Input Voltage Range | 2.25–5.5 V - compatible with 3.3 V and 5 V microcontrollers without level-shifting |
| Gate Drive Output | 10 V nominal - sufficient to fully enhance standard N-channel MOSFETs with RDS(on) < 100 mΩ |
| Turn-on Time (90% VG(ON)) | 85.3 µs typical (TT = GND) - enables >10 kHz switching in DC SSR configurations |
| Operating Temperature | –40 to +105 °C - qualified for industrial ambient environments including HVAC and motor control enclosures |
| Common-Mode Transient Immunity | 20 kV/µs - ensures reliable operation in noisy industrial bus environments with fast-switching inverters |
| AEC-Q100 Qualification | Not applicable - SI8751AB-IS is industrial-grade; automotive variant is SI8751AB-AS |
Pinout & Package
SI8751AB-IS is housed in a ROHS-compliant narrow-body SOIC-8 package (5.00 × 4.00 mm footprint, 1.27 mm pitch), offering 4.7 mm clearance and 3.9 mm creepage - exceeding IEC 60664-1 requirements for 300 VRMS mains-rated systems.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Input-side power supply pin - requires 0.1 µF bypass capacitor to GND for stable operation |
| 2 | TT | Turn-on time control - resistor-to-GND sets input current draw (1.5–13.8 mA); optional capacitor improves transient response |
| 3 | IN | Digital CMOS input - high = gate drive enabled; low = gate discharged; VIH ≥ 50% VDD, VIL ≤ 25% VDD |
| 4 | GND | Input-side reference ground - must be separated from output-side SOURCE by isolation barrier |
| 5 | SOURCE | Output-side return node - connects directly to source terminal of external N-channel FET |
| 6 | MCAP2 | Miller clamp input 2 - optional connection point for capacitor to drain of second FET in AC SSR topology |
| 7 | MCAP1 | Miller clamp input 1 - optional connection point for capacitor to drain of primary FET to suppress dV/dt-induced turn-on |
| 8 | GATE | Output-side gate drive node - delivers 10 V to external FET gate with 162–330 kΩ on-resistance depending on TT setting |
Key Features
| Feature | Design Value |
|---|---|
| Digital CMOS input interface | Eliminates need for external current-limiting resistors or LED biasing circuitry required by optocouplers |
| Internally generated secondary-side power | Removes requirement for isolated DC/DC converter or auxiliary winding, reducing BOM count and PCB area |
| Active Miller Clamp (MCAP1/MCAP2) | Prevents false triggering during high dV/dt events (e.g., inductive load commutation), enabling reliable AC switching |
| Adjustable turn-on speed via TT pin | Allows optimization of switching speed vs. input power: 1.5 mA (low-power standby) to 13.8 mA (fast 42 µs turn-on) |
| SOIC-8 industrial package | Provides industry-standard footprint with 2.5 kVRMS isolation, 20 kV/µs CMTI, and AEC-Q100-compatible construction |
Applications
| Motor Control | Valve Control |
|---|---|
|
Use Scenario: Replacing electromechanical relays in industrial PLC output modules driving 24 V DC solenoid valves or 120/240 V AC motor starters. IC Role / Device Role / Timing Role: Isolated gate driver controlling external N-channel MOSFETs in high-side or half-bridge configurations; TT pin tuned for <100 µs response to meet safety-critical actuation deadlines. Use Value: Enables compact, silent, long-life switching with no contact wear, arc suppression, or coil inrush current - critical for factory automation uptime. |
Use Scenario: Solid-state replacement for latching relays in HVAC zone dampers and irrigation control panels operating at 24 V AC or 120 V AC mains. IC Role / Device Role / Timing Role: Dual-FET AC switch driver using MCAP1/MCAP2 to clamp both FET drains during zero-crossing transitions; operates across full –40 to +105 °C range. Use Value: Eliminates relay chatter and EMI, supports rapid cycling (e.g., modulating damper position), and withstands humid, thermally cycled environments. |
| HVAC Relay Replacement | AC Mains Line Switching |
|
Use Scenario: Retrofitting legacy HVAC control boards with SSR functionality using existing SOIC-8 footprints and 3.3 V logic interfaces. IC Role / Device Role / Timing Role: Digital-input isolated driver interfacing directly with MCU GPIO; GATE/SOURCE pins connect to discrete FETs rated for 600 V blocking. Use Value: Reduces board space by >50% vs. optocoupler+driver solutions; meets UL/CSA Class 2 compliance without redesigning isolation barriers. |
Use Scenario: Smart energy meter load switching, EVSE contactor control, and programmable AC outlet modules requiring reinforced insulation and fast fault response. IC Role / Device Role / Timing Role: Primary isolation barrier and gate driver in Class I or II AC mains-connected equipment; 2.5 kVRMS rating supports 250 VRMS working voltage per UL1577. Use Value: Achieves regulatory certification with single-component isolation - avoids complex creepage/clearance layout rules required for discrete opto+MOSFET designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated FET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Silicon Labs SI8752AB-IS | Diode-emulator input (ANODE/CATHODE) instead of CMOS IN/TT; requires 1–30 mA forward current; same SOIC-8, 2.5 kVRMS, –40 to +105 °C | Used where legacy LED-driver interfaces exist or where analog current control is preferred over digital logic | Select SI8752AB-IS only if system already sources controlled current; SI8751AB-IS is preferred for direct MCU GPIO connection. |
| Toshiba TLP3547 | Optocoupler-based isolated driver; 5 kVRMS isolation; 15 V output; slower turn-on (200 µs typ); no Miller clamp; SOIC-6 package | Limited to DC loads; unsuitable for AC switching or high-dV/dt environments due to lack of active clamp | Choose TLP3547 only for cost-sensitive, low-speed DC-only applications where 20 kV/µs CMTI is not required. |
Compared with SI8752AB-IS, SI8751AB-IS offers faster digital control and lower input power; compared with TLP3547, it delivers superior noise immunity, integrated Miller clamping, and AC load capability - making it optimal for next-generation industrial SSRs.
Availability
SI8751AB-IS is available at Aetrix Electronics and suitable for motor control, HVAC relay replacement, and AC mains line switching requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for SI8751AB-IS 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 leader in analog semiconductors, specializing in RF, isolation, and precision timing solutions for communications, industrial, and automotive markets.
The SI875x family was developed to enable high-reliability, low-power solid-state relays - replacing electromechanical and optocoupler-based alternatives with RF-isolated gate drivers optimized for thermal efficiency and system-level noise immunity.
FAQ
What is the maximum input voltage the SI8751AB-IS can tolerate on its VDD pin?
The SI8751AB-IS has an absolute maximum VDD rating of 6.0 V. Operating above 5.5 V violates the recommended supply range and risks permanent damage. For robust 5 V system integration, a 5.5 V max regulator or TVS clamp is advised. The SI8751AB-IS maintains full functionality across 2.25–5.5 V, ensuring compatibility with both 3.3 V and 5 V controllers without level shifters.
Does the SI8751AB-IS require an external isolated power supply for the output side?
No, the SI8751AB-IS does not require an external isolated power supply. It uses RF-based isolation to generate its own gate drive voltage on the output side, delivering up to 10 V between GATE and SOURCE pins. This self-powered architecture eliminates the need for isolated DC/DC converters or auxiliary windings - simplifying design and reducing bill-of-materials cost in solid-state relay implementations.
How does the TT pin affect switching performance of the SI8751AB-IS?
The TT pin on the SI8751AB-IS controls input-side current draw, directly influencing turn-on speed: shorting TT to GND draws ~13.8 mA and achieves 42 µs (50% VG(ON)) turn-on; leaving TT unconnected draws ~1.5 mA and results in 286 µs (50% VG(ON)). This allows designers to optimize between low-power standby and fast-response modes without changing hardware - a key advantage over fixed-input drivers like the SI8752AB-IS.
Can the SI8751AB-IS drive both AC and DC loads?
Yes, the SI8751AB-IS supports both AC and DC load switching. For DC, it drives a single N-channel FET configured as a high-side switch. For AC, it drives two back-to-back N-channel FETs with MCAP1 and MCAP2 pins independently clamping each drain to prevent dV/dt-induced turn-on. This dual-FET capability enables true bidirectional AC switching - unlike optocoupler-based drivers limited to DC-only operation.
What certifications apply to the SI8751AB-IS isolation barrier?
The SI8751AB-IS is certified to UL1577 (2500 VRMS), CSA C22.2 No. 60950-1 (125 VRMS reinforced / 600 VRMS basic), VDE 0884-10 (630 VPEAK working voltage), and GB4943.1-2011 (CQC). All certifications are based on its 2.5 kVRMS isolation rating, with 100% production testing at 3.0 kVRMS for 1 second - meeting stringent safety requirements for industrial and commercial AC mains-connected equipment.
SI8751AB-IS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 20kV/µs
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Current - Output High, Low:
- -
- Current - Peak Output:
- -
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- -
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
SI8751AB-IS FAQ
1.How can I place an order for SI8751AB-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8751AB-IS 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 SI8751AB-IS reliable?
The price and inventory of SI8751AB-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8751AB-IS is usually 5 days.
3.What payment methods are accepted for SI8751AB-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8751AB-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8751AB-IS?
SI8751AB-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8751AB-IS 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 SI8751AB-IS?
For technical support, including SI8751AB-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8751AB-IS requirements.
6.How does Aetrix verify that SI8751AB-IS is sourced from the original manufacturer or authorized distributors?
All SI8751AB-IS 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 SI8751AB-IS meets industry standards.
7.What is the process for return or replacement of SI8751AB-IS?
All SI8751AB-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8751AB-IS, 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 SI8751AB-IS part is unused and in its original packaging.
Return procedure for SI8751AB-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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