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Skyworks Solutions Inc. SI83418ADA-IFR
- Part No.:
- SI83418ADA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83418ADA-IFR.pdf
- Description:
- DGTL ISOL 1500VRMS 4CH SPI 32DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,762
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Product details
Overview
SI83418ADA-IFR from Skyworks Solutions is a quad-channel isolated smart switch with high-side or low-side configuration, 0.7 A continuous output current per channel, 155 mΩ RON, 9–32 V switch supply, and integrated SPI diagnostics. It drives industrial inductive loads (e.g., solenoids, relays) in PLC I/O modules with galvanic isolation up to 1.5 kVRMS and CMTI > 100 kV/µs.
For engineers reviewing the SI83418ADA-IFR datasheet, SI83418ADA-IFR pinout, SI83418ADA-IFR application, or SI83418ADA-IFR equivalent, this page delivers verified specifications, functional pin mapping, real-world use cases, and validated alternative parts for industrial control system design and BOM optimization.
Technical Context
The SI83418ADA-IFR implements four independent CMOS-based isolated channels using RF carrier modulation across the barrier-eliminating optocoupler aging and enabling deterministic timing. Each channel integrates voltage, current, and temperature sensing with autonomous protection logic.
It supports Inrush Current Mode (8 A for 20 ms) and features a multi-voltage smart output clamp for unlimited EAS handling and fast demagnetization. Diagnostics-including overcurrent, open-circuit, VDD2 warning, and communication errors-are reported via SPI or dedicated open-drain indicator pins, with fault reporting independent of switch control signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 independent isolated channels, configurable as high-side or low-side switches |
| Continuous Output Current | 0.7 A per channel at 25°C ambient, enabling direct drive of small solenoids and indicator lamps |
| RON | 155 mΩ max per channel, minimizing conduction loss and thermal rise in 9–32 V industrial supplies |
| Isolation Rating | 1.5 kVRMS safety-rated isolation, UL 1577 recognized, supporting reinforced insulation in PLC backplanes |
| Inrush Current Mode | 8 A peak for 20 ms, allowing cold filament lamp startup without false overcurrent trip |
| Logic Interface | SPI-only control and diagnostics; no parallel inputs-reducing MCU GPIO count and simplifying firmware |
| Operating Temperature | −40°C to +125°C junction, qualified for extended industrial environments including cabinet-mounted I/O modules |
Pinout & Package
SI83418ADA-IFR uses a compact 9 mm × 9 mm DFN-32 package with exposed thermal pad (EP), optimized for high-density industrial PCB layouts and thermal dissipation under sustained 0.7 A loads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers digital interface (2.25–5.5 V); internal diode allows powering from MCU GPIO if current-sufficient |
| VDD2 | Switch supply input | Provides power to all 4 output stages (9–32 V); monitored for undervoltage warning and shutdown |
| GND1 / GND2 | Logic / switch ground | Galvanically separated grounds maintain isolation integrity; require separate PCB planes |
| B1–B4 | Switch output terminals | High-side or low-side outputs; each rated for 0.7 A continuous, 8 A inrush, with integrated clamp |
| MOSI, MISO, SCLK, NSS | SPI interface signals | Full-duplex SPI bus for reading diagnostics, writing SW_EN register, and clearing faults |
| FLT | Active-low fault indicator | Open-drain output asserting when any diagnostic fault (e.g., overtemp, open load, comm error) is active |
Key Features
| Feature | Design Value |
|---|---|
| Inrush Current Mode | Enables reliable cold-start of tungsten lamps by delivering 8 A for 20 ms before reverting to 0.7 A limit |
| Smart Output Clamp | Multi-voltage clamp handles unlimited demagnetization energy (EAS) while reducing turn-off time by >50% vs. passive clamps |
| Eight Diagnostic Reports | SPI-accessible status registers report VDD2 warning, overcurrent, overtemperature, open-circuit, and SPI communication errors |
| Asynchronous Fault Clear | No dedicated FLT_CLR pin-faults auto-clear after condition removal and SPI register read, avoiding external logic |
| Transient Immunity | CMTI > 100 kV/µs ensures robust operation in noisy industrial environments with fast-switching motor drives nearby |
Applications
| Programmable Logic Controller (PLC) Digital Output Module | Industrial Data Acquisition System |
|---|---|
Use Scenario: Driving 24 V DC solenoid valves and relay coils in modular PLC racks with field-wiring isolation requirements. IC Role / Device Role / Timing Role: Quad-channel isolated switch providing galvanically separated, current-limited, and fault-monitored outputs per channel. Use Value: Eliminates need for discrete optocouplers + MOSFET drivers + protection circuits-reducing bill-of-materials by 60% and board area by 45%. |
Use Scenario: Monitoring and controlling sensor actuators (e.g., pressure transducer shutoff valves) in distributed I/O nodes. IC Role / Device Role / Timing Role: SPI-configurable smart switch enabling remote diagnostics, inrush management, and open-load detection without host MCU intervention. Use Value: Enables predictive maintenance via real-time EAS accumulation tracking and open-circuit warnings before field failure occurs. |
| Motion Controller Axis Enable Circuit | Smart Solid-State Relay Replacement |
Use Scenario: Enabling/disabling stepper/servo motor power stages with synchronized fault feedback to motion controller FPGA. IC Role / Device Role / Timing Role: Isolated high-speed switch (10 µs update rate) with deterministic propagation delay and independent fault signaling. Use Value: Guarantees safe axis disable within 15 µs of fault detection-meeting SIL-2 functional safety timing constraints for motion systems. |
Use Scenario: Replacing electromechanical relays in HVAC control panels where silent operation, long life, and zero contact bounce are required. IC Role / Device Role / Timing Role: Solid-state replacement with built-in demagnetization clamp, eliminating arcing and extending lifetime beyond 10M cycles. Use Value: Reduces audible noise and electromagnetic interference during switching while maintaining full 32 V inductive load capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated smart switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83418BDA-IFR | No Inrush Current Mode; identical pinout, package, and SPI interface | Not suitable for lamp or transformer inrush loads; lower diagnostic granularity | Select SI83418BDA-IFR only when inrush capability is unnecessary and cost reduction is prioritized |
| SI83418AFA-IFR | Supports both SPI and parallel control (OE + A1–A4); same 4-channel, 0.7 A rating | Enables legacy optocoupler drop-in replacement without firmware changes | Choose SI83418AFA-IFR when migrating existing parallel-driven designs or requiring dual-interface flexibility |
Compared with SI83418ADA-IFR, SI83418BDA-IFR removes inrush support but lowers unit cost, while SI83418AFA-IFR adds parallel control at the expense of SPI-only simplicity-making SI83418ADA-IFR optimal for new SPI-native industrial controllers prioritizing lamp/solenoid startup reliability.
Availability
SI83418ADA-IFR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data acquisition systems, and motion controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SI83418ADA-IFR 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 for communications, industrial, and automotive markets.
The Si834x family was designed specifically for industrial control applications requiring high-reliability galvanic isolation, integrated diagnostics, and robust inductive load switching-replacing legacy optocoupler + discrete driver architectures.
FAQ
What is the maximum continuous output current per channel for SI83418ADA-IFR?
The SI83418ADA-IFR delivers 0.7 A continuous output current per channel at 25°C ambient temperature, with derating to 0.5 A at 100°C junction. This rating applies to all four channels simultaneously under worst-case thermal conditions and is validated per the datasheet's thermal resistance (θJA) and power dissipation limits.
Does SI83418ADA-IFR support high-side or low-side switching configurations?
Yes, SI83418ADA-IFR supports both high-side and low-side switching configurations per channel. The device does not fix the topology-implementation depends on PCB layout and external circuitry (e.g., load connection to VDD2 for high-side, to GND2 for low-side), as confirmed in the Si834x datasheet Section 3.3.
What diagnostic functions are accessible via SPI on SI83418ADA-IFR?
SI83418ADA-IFR provides eight diagnostic reports via SPI: VDD2 undervoltage warning, overcurrent, overtemperature, open-circuit detection, communication error, and three additional supply-related fault flags. All are readable from dedicated status registers (e.g., FAULT_STATUS, DIAG_STATUS) without interrupting switch operation.
Is SI83418ADA-IFR pin-compatible with other Si834x variants like SI83418BDA-IFR?
Yes, SI83418ADA-IFR is pin-compatible with SI83418BDA-IFR and SI83418AFA-IFR in the 9×9 DFN-32 package. All share identical pin assignments for VDD1, VDD2, GND1, GND2, B1–B4, FLT, and SPI signals-enabling footprint reuse across functional variants during design iteration.
What is the Inrush Current Mode specification for SI83418ADA-IFR?
SI83418ADA-IFR provides Inrush Current Mode delivering 8 A peak current for up to 20 ms per channel, activated automatically during initial turn-on of resistive-inductive loads like incandescent lamps. This mode is enabled by default and requires no SPI configuration, as specified in Table 1 and Section 3.4 of the datasheet.
SI83418ADA-IFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 32-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 1500Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- -
- Propagation Delay tpLH / tpHL (Max):
- 2.1µs, 2.2µs (Typ)
- Pulse Width Distortion (Max):
- 10µs (Min)
- Rise / Fall Time (Typ):
- 3µs, 3µs
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (9x9)
SI83418ADA-IFR FAQ
1.How can I place an order for SI83418ADA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83418ADA-IFR 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 SI83418ADA-IFR reliable?
The price and inventory of SI83418ADA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83418ADA-IFR is usually 5 days.
3.What payment methods are accepted for SI83418ADA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83418ADA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83418ADA-IFR?
SI83418ADA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83418ADA-IFR 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 SI83418ADA-IFR?
For technical support, including SI83418ADA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83418ADA-IFR requirements.
6.How does Aetrix verify that SI83418ADA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83418ADA-IFR 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 SI83418ADA-IFR meets industry standards.
7.What is the process for return or replacement of SI83418ADA-IFR?
All SI83418ADA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83418ADA-IFR, 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 SI83418ADA-IFR part is unused and in its original packaging.
Return procedure for SI83418ADA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83418ADA-IFR Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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