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Skyworks Solutions Inc. SI8751AB-ASR
- Part No.:
- SI8751AB-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8751AB-ASR.pdf
- Description:
- DGTL ISO 2.5KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,209
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Product details
Overview
SI8751AB-ASR from Skyworks Solutions is an automotive-grade isolated FET driver with digital CMOS input control, 2.5 kVRMS reinforced isolation, –40 to +125 °C operating range, 10 V gate drive output, and integrated Active Miller Clamp. It enables compact, high-reliability solid-state relay (SSR) designs by driving external N-channel MOSFETs in motor control, battery monitoring, and AC mains switching applications.
For engineers reviewing the SI8751AB-ASR datasheet, SI8751AB-ASR pinout, SI8751AB-ASR application, or SI8751AB-ASR equivalent, this page delivers verified technical context, SOIC-8 package mapping, automotive AEC-Q100 qualification, turn-on/turn-off timing under TT pin control, and real-world SSR replacement use cases - all confirmed against Skyworks' official Si8751/52 Data Sheet (Rev. A, July 2022).
Technical Context
The SI8751AB-ASR uses RF-based CMOS isolation to transmit both signal and power across the barrier, eliminating need for a floating secondary supply. Its digital input stage accepts 2.25–5.5 V logic levels with 180 mV hysteresis, while the output side generates up to 13 V gate drive voltage referenced to SOURCE.
Turn-on speed is actively controlled via the TT pin: connecting it to GND yields fastest switching (typ. 42 µs to 50% VG(ON)), while leaving it unconnected reduces supply current to 1.5 mA but extends turn-on to 650 µs. The dual MCAP1/MCAP2 pins support optional Miller clamp capacitors (10–100 pF) to suppress dV/dt-induced false turn-on in high-side FET configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2.5 kVRMS reinforced insulation - certified to UL1577, VDE 0884-10, CSA C22.2 No. 5A, CQC GB4943.1-2011 |
| Operating Temperature | –40 °C to +125 °C ambient - qualified per AEC-Q100 Grade 1 for automotive systems |
| Gate Drive Output | 7.5–13 V typical VG(ON) - sufficient to fully enhance standard N-channel MOSFETs without external level-shifting |
| Input Supply Range | 2.25–5.5 V VDD - compatible with 3.3 V and 5 V microcontrollers without level translation |
| Turn-on Time (50%) | 42–650 µs - adjustable via TT pin resistor/capacitor network to balance speed vs. input current consumption |
| Common-Mode Transient Immunity | 20 kV/µs - ensures robust operation in noisy motor drive or battery-switching environments |
| Miller Clamp Current | 6 mA max - provides active gate-source discharge path during high dV/dt events on FET drain |
Pinout & Package
SI8751AB-ASR is housed in a ROHS-compliant narrow-body SOIC-8 package (5.0 × 4.0 mm footprint, 1.27 mm pitch), with creepage ≥3.9 mm and clearance ≥4.7 mm - meeting IEC 60664-1 requirements for 600 VRMS basic insulation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Input-side power supply pin - requires 0.1 µF bypass capacitor to GND; supports 2.25–5.5 V operation |
| 2 | TT | Turn-on time control - resistor-to-GND sets input current draw and switching speed; optional capacitor adds transient boost |
| 3 | IN | Digital logic input - high = gate drive enabled; low = gate discharged; VIH ≥50% VDD, VIL ≤25% VDD |
| 4 | GND | Input-side reference ground - must be connected to controller ground; separate from isolated output ground |
| 5 | SOURCE | Output-side source reference - 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 configuration |
| 7 | MCAP1 | Miller clamp input 1 - optional connection point for capacitor to drain of primary FET in DC or AC SSR |
| 8 | GATE | Output-side gate drive - delivers isolated 10 V (typ.) to external FET gate; no external bootstrap or charge pump required |
Key Features
| Feature | Design Value |
|---|---|
| Digital CMOS input interface | Eliminates need for LED bias circuitry or current-limiting resistors - simplifies controller interfacing and reduces BOM count |
| Internally generated isolated gate drive | Removes requirement for auxiliary isolated DC/DC converter - cuts PCB area, cost, and EMI sources in SSR designs |
| Adjustable turn-on speed via TT pin | Enables tradeoff between fast switching (≤42 µs) and ultra-low quiescent current (1.5 mA) without changing firmware or layout |
| Active Miller Clamp (dual MCAP inputs) | Prevents spurious FET turn-on during high dV/dt transients - critical for reliable operation with fast-switching SiC or GaN FETs |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood and charging applications - supports functional safety analysis per ISO 26262 ASIL-B |
Applications
| Motor Control | Valve Control |
|---|---|
Use Scenario: Replacing electromechanical relays in 12 V/24 V DC brushed motor start-stop circuits for HVAC actuators or industrial automation. IC Role / Device Role / Timing Role: Isolated gate driver enabling direct MCU-level control of N-channel MOSFETs without optocoupler latency or aging. Use Value: 42 µs turn-on time (TT = GND) ensures precise PWM timing; 2.5 kVRMS isolation protects MCU from motor back-EMF spikes. |
Use Scenario: Solid-state switching of solenoid valves in battery-powered irrigation controllers or pneumatic systems. IC Role / Device Role / Timing Role: Digital-input SSR core - converts low-power MCU GPIO into robust, galvanically isolated gate drive for power FETs. Use Value: 1.5 mA quiescent current (TT unconnected) extends battery life; AEC-Q100 rating ensures reliability in outdoor temperature extremes. |
| HEV/EV Automotive Charging | AC Mains Line Switching |
Use Scenario: Controlling contactor precharge or main power paths in on-board chargers (OBC) and DC-DC converters. IC Role / Device Role / Timing Role: Isolated driver for high-side N-channel FETs in bidirectional power stages - coordinated with system safety monitors. Use Value: –40 to +125 °C operation supports under-hood placement; UL/VDE certification enables compliance with automotive functional safety standards. |
Use Scenario: Replacing mechanical relays in smart energy meters, EVSEs, and industrial PLC output modules switching 120/230 V AC loads. IC Role / Device Role / Timing Role: Dual-FET driver enabling back-to-back AC switching topology with synchronized gate control and Miller clamp protection. Use Value: Dual MCAP1/MCAP2 pins allow independent clamping of each FET drain - prevents shoot-through during zero-crossing commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SIL1117BD-IS | Lower isolation rating (1.5 kVRMS), no TT pin, fixed 10 V output, industrial temp only (–40 to +105 °C) | Lacks AEC-Q100 qualification and automotive temperature range - unsuitable for under-hood or charging applications | Consider only for cost-sensitive industrial DC SSRs where 2.5 kV isolation and extended temperature are not required. |
| ADUM4122ARIZ | 3.75 kVRMS isolation, 4 A peak output, but requires external isolated supply and has no Miller clamp | Higher drive strength supports larger FETs, but added complexity of isolated DC/DC increases BOM and layout effort | Prefer when driving >100 A FETs in high-power inverters; avoid if minimizing component count and board space is critical. |
Compared with SIL1117BD-IS, SI8751AB-ASR delivers higher isolation, automotive qualification, and TT-adjustable timing - making it superior for safety-critical vehicle systems. Versus ADUM4122ARIZ, SI8751AB-ASR eliminates external isolated supply dependency and integrates Miller clamp, reducing design risk in fast-switching AC applications.
Availability
SI8751AB-ASR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and AC mains line switching requiring stable component supply across automotive production programs and industrial embedded development cycles.
Supply support for SI8751AB-ASR 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 Si875x family was designed specifically to replace optocoupler-based SSRs with higher reliability, wider temperature range, and simplified system-level design - targeting automotive electrification, industrial automation, and energy infrastructure.
FAQ
What is the maximum input supply voltage for SI8751AB-ASR?
The absolute maximum VDD for SI8751AB-ASR is 6.0 V, but operational specification limits it to 2.25–5.5 V. Exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings (Table 4.8). At 5.5 V with TT grounded, input current reaches 17 mA - still within safe operating limits defined by thermal derating curves and safety input current ratings (206 mA at TJ = 150 °C).
Does SI8751AB-ASR require an external isolated power supply?
No, SI8751AB-ASR does not require an external isolated power supply. It uses RF-based CMOS isolation to generate its own gate drive voltage on the output side, delivering up to 13 V referenced to SOURCE. This self-contained power transfer eliminates the need for isolated DC/DC converters or charge pumps - a key differentiator from non-integrated isolated gate drivers like the ADUM4122ARIZ.
How does the TT pin affect switching performance in SI8751AB-ASR?
The TT pin on SI8751AB-ASR controls input current draw and thus turn-on speed: grounding TT yields fastest switching (42 µs to 50% VG(ON)) at ~13.8 mA IDD; using a 10 kΩ resistor slows turn-on to 58–170 µs while reducing current to 7.8–9.5 mA; leaving TT unconnected minimizes current (1.5–1.8 mA) but extends turn-on to 286–650 µs. This allows dynamic optimization without hardware changes.
Can SI8751AB-ASR drive both AC and DC loads?
Yes, SI8751AB-ASR supports both AC and DC load configurations. For DC, it drives a single N-channel FET with SOURCE tied to system ground. For AC, it drives two back-to-back N-channel FETs - one per phase - using dual MCAP1/MCAP2 pins to independently clamp each FET's drain. This architecture enables zero-voltage switching and eliminates leakage current inherent in TRIAC-based solutions.
Is SI8751AB-ASR certified for automotive use?
Yes, SI8751AB-ASR is AEC-Q100 qualified (Grade 1, –40 to +125 °C) and carries full regulatory certifications including UL1577 (2500 VRMS), VDE 0884-10 (630 VPEAK), CSA C22.2 No. 5A, and CQC GB4943.1-2011. These certifications validate its suitability for automotive charging systems, battery disconnect units, and other safety-critical vehicle subsystems.
SI8751AB-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
SI8751AB-ASR FAQ
1.How can I place an order for SI8751AB-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8751AB-ASR 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-ASR reliable?
The price and inventory of SI8751AB-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8751AB-ASR is usually 5 days.
3.What payment methods are accepted for SI8751AB-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8751AB-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8751AB-ASR?
SI8751AB-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8751AB-ASR 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-ASR?
For technical support, including SI8751AB-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8751AB-ASR requirements.
6.How does Aetrix verify that SI8751AB-ASR is sourced from the original manufacturer or authorized distributors?
All SI8751AB-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8751AB-ASR?
All SI8751AB-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8751AB-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8751AB-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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