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Skyworks Solutions Inc. SI83418AFA-IFR
- Part No.:
- SI83418AFA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83418AFA-IFR.pdf
- Description:
- DGTL ISOL 1500VRMS 4CH SPI 32DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,624
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Product details
Overview
SI83418AFA-IFR from Skyworks Solutions is a quad-channel isolated smart switch with high-side sourcing capability, 0.7 A continuous current per channel, 155 mΩ RON, and integrated SPI + parallel control interface. It delivers galvanic isolation (1.5 kVRMS), >100 kV/µs CMTI, and Inrush Current Mode (8 A for 20 ms) for driving industrial solenoids and relays in PLC I/O modules.
For engineers reviewing the SI83418AFA-IFR datasheet, SI83418AFA-IFR pinout, SI83418AFA-IFR application, or SI83418AFA-IFR equivalent, this page provides verified specifications, fault diagnostics architecture, isolation barrier timing behavior, and real-world implementation guidance for industrial control system design.
Technical Context
The SI83418AFA-IFR implements four independent high-side switches using RF-based CMOS isolation across a single die, each with dedicated voltage/current/temperature sensing and a multi-voltage smart output clamp. Its dual-interface architecture supports simultaneous parallel input control (An/OE) and full-duplex SPI diagnostics (MOSI/MISO/SCLK/NSS).
Switch operation includes Inrush Current Mode activation, overcurrent protection with configurable thresholds, undervoltage lockout on both VDD1 (2.25–5.5 V) and VDD2 (9–32 V), and eight diagnostic reports accessible via SPI status registers - including open-circuit detection, communication error, and supply warning states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 high-side sourcing switches, independently controllable |
| Continuous Current | 0.7 A per channel at 25 °C, enabling direct drive of 24 V solenoids and indicator lamps |
| RON | 155 mΩ max per channel, minimizing power loss and thermal rise in compact layouts |
| Isolation Rating | 1.5 kVRMS for 1 minute (UL 1577 pending), supporting functional safety in industrial environments |
| CMTI | >100 kV/µs, ensuring reliable operation in noisy motor-control and relay-switching applications |
| Inrush Current Mode | 8 A for 20 ms per channel, enabling cold-start of incandescent lamps without contact welding |
| Logic Supply Range | 2.25 V–5.5 V, compatible with low-power microcontrollers and FPGA I/O banks |
| Switch Supply Range | 9 V–32 V, matching standard industrial 24 V DC bus requirements |
Pinout & Package
SI83418AFA-IFR is housed in 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 load conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers digital interface (SPI/parallel); accepts 2.25–5.5 V; internal UVLO at ~2.1 V |
| VDD2 | Switch supply input | Powers all four high-side drivers; 9–32 V range; monitored for undervoltage warning (VDD2_WRN) |
| GND1 / GND2 | Logic / power ground | Galvanically isolated grounds separated by CMOS isolation barrier; must be routed separately |
| A1–A4 | Parallel input control | Active-high logic inputs for direct channel enable; synchronous with OE pin |
| OE | Output enable | Asynchronous global enable/disable; overrides individual A1–A4 signals when low |
| MOSI / MISO / SCLK / NSS | SPI interface | Full-duplex SPI port for diagnostics read/write, configuration, and fault clearing |
| B1–B4 | High-side switch outputs | Source current to loads; include integrated clamp, current sensing, and thermal monitoring |
| FLT | Fault indicator | Active-low open-drain output asserting when any diagnostic fault is active (e.g., overtemp, open-load) |
| VDD2_WRN | Supply warning indicator | Active-low open-drain flag signaling VDD2 in warning range (9–18 V), not full UVLO |
Key Features
| Feature | Design Value |
|---|---|
| RF-based CMOS isolation | Eliminates LED aging and temperature drift of optocouplers; enables >100 kV/µs CMTI and 1.5 kVRMS rating |
| Smart output clamp | Multi-voltage clamp handles unlimited EAS energy during inductive turn-off, enabling fast demagnetization without external snubbers |
| Inrush Current Mode | 8 A peak for 20 ms per channel, supporting lamp filament pre-heat without overstressing MOSFET or trace |
| Eight SPI-accessible diagnostics | Real-time reporting of VDD1/VDD2 status, overcurrent, overtemperature, open-circuit, and SPI communication errors |
| Dual-control interface | Simultaneous parallel (A1–A4/OE) and SPI control allows legacy optocoupler replacement while retaining advanced diagnostics |
| Channel status indicators | No dedicated LEDn pins on SI83418AFA-IFR; all status accessed via SPI register reads only |
Applications
| Programmable Logic Controller (PLC) Output Module | Industrial Data Acquisition System |
|---|---|
Use Scenario: Driving 24 V DC solenoid valves and relay coils in modular PLC backplanes with hot-swap capability. IC Role / Device Role / Timing Role: High-side isolated switch providing load power switching, fault detection, and supply monitoring per channel. Use Value: Enables single-chip replacement of optocoupler + discrete MOSFET + protection circuit, reducing BOM count and improving reliability under EMI stress. | Use Scenario: Monitoring and controlling field devices (sensors, actuators) in distributed I/O nodes connected via RS-485 or EtherCAT. IC Role / Device Role / Timing Role: Isolated output driver with SPI-read diagnostics for remote health reporting and predictive maintenance. Use Value: Delivers real-time open-circuit and overtemperature alerts via SPI, eliminating need for external sense resistors or ADC channels. |
| Motion Controller Axis Interface | Smart Solid-State Relay Replacement |
Use Scenario: Controlling brake solenoids and limit-switch interfaces in servo-driven motion systems requiring precise timing and fault response. IC Role / Device Role / Timing Role: Galvanically isolated high-side switch with 10 µs update rate and sub-100 ns propagation delay variation. Use Value: Supports deterministic switching synchronized to motion control loops, with fast fault shutdown (<10 µs) preventing mechanical damage during overtravel events. | Use Scenario: Replacing electromechanical relays in HVAC control panels and building automation systems where silent operation and long life are critical. IC Role / Device Role / Timing Role: Solid-state high-side switch with built-in inrush handling and demagnetization clamp for inductive loads. Use Value: Eliminates contact arcing and bounce, extends service life beyond 10 million cycles, and reduces acoustic noise in occupied spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated high-side switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83414AAA-IF | Same 4-channel high-side sourcing, same 0.7 A/155 mΩ, but includes VDD2_WRN and FLT pins only - no SPI interface | Lacks SPI diagnostics; limited to basic fault indication via open-drain pins | Select SI83414AAA-IF only if diagnostics are handled externally and board space is constrained |
| SI83418ADA-IF | Identical pinout and electrical specs, but supports Inrush Current Mode and lacks VDD2_WRN and FLT pins | Removes dedicated fault/warning pins; diagnostics fully SPI-only | Choose SI83418ADA-IF when all monitoring is centralized via host MCU SPI and PCB routing must avoid extra indicator traces |
Compared with SI83414AAA-IF and SI83418ADA-IF, SI83418AFA-IFR uniquely retains both parallel control and full SPI diagnostics while preserving VDD2_WRN and FLT indicator pins - offering maximum flexibility for hybrid diagnostic architectures in field-deployed industrial hardware.
Availability
SI83418AFA-IFR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data acquisition systems, and motion controller designs requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for SI83418AFA-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 infrastructure, automotive, and industrial markets.
The Si834x product line was designed specifically for industrial control applications requiring robust galvanic isolation, integrated protection, and diagnostic visibility - replacing legacy optocoupler + discrete driver combinations with a single high-reliability IC.
FAQ
What is the maximum continuous current per channel for SI83418AFA-IFR?
The SI83418AFA-IFR supports 0.7 A continuous current per channel at 25 °C ambient, with derating above 85 °C. This rating applies to all four high-side switches simultaneously under typical PCB copper area (2 oz, 1 in² per side) and still-air conditions. The device's 155 mΩ RON ensures minimal self-heating at rated load, and its integrated thermal protection shuts down individual channels before junction temperature exceeds 150 °C.
Does SI83418AFA-IFR support both parallel and SPI control simultaneously?
Yes, SI83418AFA-IFR supports concurrent parallel and SPI control: A1–A4 and OE pins provide real-time switching, while the SPI interface (MOSI/MISO/SCLK/NSS) operates independently for diagnostics, configuration, and fault clearing. Control signal arbitration is handled internally - SPI writes do not interfere with parallel input sampling, and parallel updates do not disrupt ongoing SPI transactions.
What isolation certifications apply to SI83418AFA-IFR?
SI83418AFA-IFR carries pending UL 1577 recognition (1500 VRMS/1 min), CSA certification to IEC 62368-1, and CQC approval to GB4943.1. Its 1.5 kVRMS isolation rating and >100 kV/µs CMTI meet IEC 61131-2 requirements for industrial programmable controllers. Final certification documentation is available directly from Skyworks upon request.
How does the Inrush Current Mode function on SI83418AFA-IFR?
SI83418AFA-IFR activates Inrush Current Mode automatically when a channel is turned on under cold-load conditions, delivering up to 8 A for 20 ms to preheat lamp filaments or overcome solenoid static friction. The mode is enabled by default and requires no SPI configuration. After the 20 ms window, current limits to 0.7 A unless overridden by external PWM control via the parallel interface.
Can SI83418AFA-IFR detect open-circuit faults on connected loads?
Yes, SI83418AFA-IFR performs continuous open-circuit detection on each channel using integrated current sensing and voltage monitoring. When an open load is detected - such as a broken wire or disconnected solenoid - the device reports OPEN_CH in its SPI status register and asserts the FLT pin. This diagnostic is available in real time and can be polled or interrupt-triggered via the host MCU's SPI interface.
SI83418AFA-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)
SI83418AFA-IFR FAQ
1.How can I place an order for SI83418AFA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83418AFA-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 SI83418AFA-IFR reliable?
The price and inventory of SI83418AFA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83418AFA-IFR is usually 5 days.
3.What payment methods are accepted for SI83418AFA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83418AFA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83418AFA-IFR?
SI83418AFA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83418AFA-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 SI83418AFA-IFR?
For technical support, including SI83418AFA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83418AFA-IFR requirements.
6.How does Aetrix verify that SI83418AFA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83418AFA-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 SI83418AFA-IFR meets industry standards.
7.What is the process for return or replacement of SI83418AFA-IFR?
All SI83418AFA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83418AFA-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 SI83418AFA-IFR part is unused and in its original packaging.
Return procedure for SI83418AFA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83418AFA-IFR Tags
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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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