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Skyworks Solutions Inc. SI83408AFA-IFR
- Part No.:
- SI83408AFA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83408AFA-IFR.pdf
- Description:
- DGTL ISOL 1500VRMS 4CH SPI 32DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
SI83408AFA-IFR from Skyworks Solutions is a 4-channel isolated high-side smart switch IC with galvanic CMOS isolation, 0.7 A continuous current per channel, 9–32 V switch supply, 2.25–5.5 V logic supply, and integrated Inrush Current Mode (8 A for 20 ms) for driving industrial solenoids and relays in PLC I/O modules.
For engineers reviewing the SI83408AFA-IFR datasheet, SI83408AFA-IFR pinout, SI83408AFA-IFR application, or SI83408AFA-IFR equivalent, this device delivers fault-aware switching with SPI + parallel control, eight diagnostics via status registers, and 1.5 kVRMS safety-rated isolation - critical for functional safety in industrial control systems requiring robust load monitoring and demagnetization handling.
Technical Context
The SI83408AFA-IFR implements four independent high-side switches with dedicated isolation channels, each featuring real-time voltage, current, and temperature sensing. Its RF-based CMOS isolation barrier provides >100 kV/µs CMTI and supports both parallel input control and full SPI diagnostics access.
It integrates a multi-voltage smart output clamp enabling unlimited EAS handling and fast turn-OFF, while Inrush Current Mode allows safe cold-start of incandescent lamps. Fault reporting includes overcurrent, overtemperature, open-circuit, and communication errors - all accessible via SPI or monitored through FLT and MOSI_THRU pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | 4-channel high-side sourcing switch with open-source configuration |
| Continuous Current | 0.7 A per channel at 25 °C; enables direct drive of 24 V solenoids and indicator lamps |
| Isolation Rating | 1.5 kVRMS safety-rated isolation; UL 1577 recognized (1500 Vrms/1 min), compliant with IEC 61131-2 |
| Logic Supply Range | 2.25 V–5.5 V; compatible with low-power 2.5 V/3.3 V MCUs without level-shifting |
| Switch Supply Range | 9 V–32 V; matches standard industrial DC bus voltages including 24 V nominal systems |
| Inrush Current Mode | 8 A for 20 ms; sustains lamp filament surge without tripping protection |
| CMTI | >100 kV/µs; prevents false triggering in noisy factory environments with fast transients |
| Operating Temperature | −40 °C to +125 °C ambient; qualified for extended use in uncooled control cabinets |
Pinout & Package
SI83408AFA-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 in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Provides power to digital interface and isolation transmitter side; 2.25–5.5 V range |
| OE | Asynchronous output enable | Hardware-level global disable; forces all outputs OFF regardless of SPI or parallel state |
| GND1 | Logic ground reference | Return path for VDD1 and digital interface signals; must be separated from GND2 by isolation barrier |
| VDD2 | Switch supply input (x4) | Power source for all four high-side drivers; 9–32 V operation with undervoltage warning detection |
| GND2 | Switch ground reference | Return path for load current; electrically isolated from GND1; connects to load return |
| A1–A4 | Parallel input channels | Direct logic-level control inputs for each channel; active-high, TTL/CMOS compatible |
| B1–B4 | High-side switch outputs | Source outputs tied to VDD2; drive loads between Bn and GND2; RON = 155 mΩ typical |
| FLT | Active-low fault indicator | Open-drain output asserting when any diagnostic fault is detected; requires external pull-up |
| MOSI_THRU | SPI passthrough signal | Enables daisy-chaining multiple SI83408AFA-IFR devices on shared SPI bus without additional logic |
| NSS, SCLK, MOSI, MISO | SPI interface signals | Full-duplex SPI port for reading diagnostics, configuring protection thresholds, and controlling SW_EN registers |
Key Features
| Feature | Design Value |
|---|---|
| Galvanic CMOS isolation | Replaces optocouplers with >100 kV/µs CMTI, no LED aging, and guaranteed lifetime reliability |
| Multi-voltage smart clamp | Handles unlimited demagnetization energy (EAS) while maintaining fast turn-OFF for inductive loads |
| Inrush Current Mode | Delivers 8 A peak for 20 ms to safely energize cold lamp filaments without false overcurrent shutdown |
| Eight diagnostics via SPI | Reports VDD2 warning, overcurrent, overtemperature, open-circuit, and communication errors independently per channel |
| Dedicated fault indicator (FLT) | Single-pin hardware alert for system-level fault response; operates independently of SPI or MCU activity |
| Asynchronous OE pin | Enables immediate hardware-level shutdown during emergency stop or power-fail conditions |
Applications
| Programmable Logic Controllers (PLCs) | Industrial Data Acquisition Systems |
|---|---|
Use Scenario: Digital output module in modular PLC chassis driving 24 V solenoid valves and pneumatic actuators. IC Role / Device Role / Timing Role: High-side switch providing isolated, current-limited, and fault-monitored load control with <10 µs update rate. Use Value: Eliminates need for discrete protection circuitry and optocoupler + driver combinations, reducing BOM count and board area by 40%. |
Use Scenario: Remote I/O node collecting sensor data and controlling field devices in distributed automation networks. IC Role / Device Role / Timing Role: Isolated output driver interfacing with Modbus RTU or EtherNet/IP controllers via SPI-configurable diagnostics. Use Value: Enables predictive maintenance through real-time open-circuit and overtemperature reporting without adding external sensors. |
| Motion Control Systems | Smart Solid-State Relays |
Use Scenario: Axis controller output stage managing brake release coils and limit switch feedback in servo drives. IC Role / Device Role / Timing Role: Fast-switching high-side driver with precise inrush management for electromagnetic brakes. Use Value: Prevents coil burnout during repeated engagement cycles using programmable Inrush Current Mode and thermal derating. |
Use Scenario: DIN-rail mounted solid-state relay replacement with embedded diagnostics for HVAC and lighting panels. IC Role / Device Role / Timing Role: Safety-isolated switching element with UL 1577 recognition and fault signaling for panel-level monitoring. Use Value: Meets IEC 61131-2 requirements for industrial switching while supporting remote fault logging via SPI bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side isolated switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83408ADA-IFR | Lacks Inrush Current Mode; same 0.7 A rating, 4-channel high-side, SPI-only interface (no parallel inputs) | Suitable for fixed-function systems where lamp loads are absent and MCU handles all timing | Select when SPI-only control suffices and inrush capability is unnecessary; reduces pin count and firmware complexity |
| SI83404AAA-IFR | Same Inrush Current Mode and parallel/SPI interface, but rated for 0.7 A with channel-status indicators (LED1–LED4) | Preferred where visual channel status is required on front-panel displays or local HMI | Choose when local LED feedback is needed; adds four open-drain indicator pins not present on SI83408AFA-IFR |
Compared with SI83408ADA-IFR, SI83408AFA-IFR adds Inrush Current Mode and parallel control flexibility; compared with SI83404AAA-IFR, it omits LED indicator pins to reduce pin count and simplify routing - making SI83408AFA-IFR optimal for space-constrained PLC modules needing inrush support without local status LEDs.
Availability
SI83408AFA-IFR is available at Aetrix Electronics and suitable for industrial programmable logic controllers, motion controllers, and smart solid-state relays requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61131-2 and UL 1577 standards.
Supply support for SI83408AFA-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 digital output modules, replacing legacy optocoupler + MOSFET driver stacks with integrated, isolated, and self-diagnosing smart switches.
FAQ
What is the maximum continuous current per channel for SI83408AFA-IFR?
The SI83408AFA-IFR supports 0.7 A continuous current per channel at 25 °C ambient, with derating above that temperature. This rating applies to all four high-side outputs simultaneously under typical PCB layout and thermal conditions specified in the datasheet's recommended footprint.
Does SI83408AFA-IFR support both SPI and parallel control simultaneously?
Yes, SI83408AFA-IFR supports concurrent SPI and parallel control: A1–A4 accept direct logic-level inputs while NSS, SCLK, MOSI, and MISO enable full diagnostic read/write access. The OE pin provides hardware-level override independent of either interface.
What isolation certifications does SI83408AFA-IFR hold?
SI83408AFA-IFR is UL 1577 recognized (1500 Vrms/1 min), certified to CSA 62368-1 and CQC GB4943.1, and compliant with IEC 61131-2. Its 1.5 kVRMS isolation rating meets functional safety requirements for industrial control equipment.
How does the Inrush Current Mode function in SI83408AFA-IFR?
SI83408AFA-IFR's Inrush Current Mode delivers up to 8 A for 20 ms upon channel activation, allowing safe cold-start of incandescent lamps and other high-inrush resistive loads. It automatically reverts to 0.7 A continuous mode after the timeout unless retriggered.
Can SI83408AFA-IFR detect open-circuit faults on connected loads?
Yes, SI83408AFA-IFR reports open-circuit faults via its eight diagnostic registers accessible through SPI. The OPEN_CH flag is asserted when no load current is detected despite an ON command, enabling automated fault logging and maintenance alerts.
SI83408AFA-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):
- 2.3µs, 2.9µs (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)
SI83408AFA-IFR FAQ
1.How can I place an order for SI83408AFA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83408AFA-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 SI83408AFA-IFR reliable?
The price and inventory of SI83408AFA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83408AFA-IFR is usually 5 days.
3.What payment methods are accepted for SI83408AFA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83408AFA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83408AFA-IFR?
SI83408AFA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83408AFA-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 SI83408AFA-IFR?
For technical support, including SI83408AFA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83408AFA-IFR requirements.
6.How does Aetrix verify that SI83408AFA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83408AFA-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 SI83408AFA-IFR meets industry standards.
7.What is the process for return or replacement of SI83408AFA-IFR?
All SI83408AFA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83408AFA-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 SI83408AFA-IFR part is unused and in its original packaging.
Return procedure for SI83408AFA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83408AFA-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
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ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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