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Skyworks Solutions Inc. SI83404ACA-IFR
- Part No.:
- SI83404ACA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83404ACA-IFR.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:1,679
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Product details
Overview
SI83404ACA-IFR from Skyworks Solutions is a 4-channel isolated smart high-side switch IC with galvanic CMOS isolation, 0.7 A continuous current per channel, 155 mΩ RON, 9–32 V switch supply, and integrated Inrush Current Mode (8 A/20 ms) for lamp loads - deployed in industrial PLC output modules requiring fault-resilient load control.
For engineers reviewing the SI83404ACA-IFR datasheet, SI83404ACA-IFR pinout, SI83404ACA-IFR application, or SI83404ACA-IFR equivalent, this page delivers verified specifications, SPI+parallel interface behavior, open-channel detection capability, VDD2 warning indicator functionality, and real-world diagnostic reporting structure per IEC 61131-2 compliance.
Technical Context
The SI83404ACA-IFR implements four independent high-side switches with dedicated RF-based isolation channels, each featuring real-time voltage, current, and temperature sensing plus a multi-voltage smart output clamp for unlimited EAS handling and fast inductive turn-off. Its dual-interface architecture supports parallel input control with asynchronous OE and optional SPI diagnostics.
It operates with logic supply 2.25–5.5 V and switch supply 9–32 V, delivers 10 µs update rate, and reports eight distinct diagnostics-including VDD2 under-voltage warning (VDD2_WRN), open-channel detection (OPEN_CH), over-temperature, over-current, and communication error-via SPI registers or dedicated open-drain pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 independent high-side switches with galvanic isolation per channel |
| Continuous Current | 0.7 A per channel at 25 °C; enables driving solenoids, relays, and lamps in PLC I/O modules |
| RON | 155 mΩ max; minimizes power loss and thermal rise under full load |
| Inrush Current Mode | 8 A for 20 ms; supports cold filament lamp startup without false overcurrent trip |
| Isolation Rating | 1.5 kVRMS safety-rated; certified to UL 1577, CSA 62368-1, CQC GB4943.1 |
| CMTI | >100 kV/µs; ensures robust operation in noisy industrial environments with fast transients |
| Operating Temp | −40 to +125 °C; qualified for extended industrial ambient and junction temperature ranges |
Pinout & Package
SI83404ACA-IFR is housed in a compact 9×9 mm DFN-32 package with exposed thermal pad (EP), optimized for high-density industrial PCB layouts and thermal management in enclosed control cabinets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers digital interface (2.25–5.5 V); internal diode allows powering from logic inputs if source current sufficient |
| VDD2 | Switch supply input | Provides power to all 4 high-side drivers (9–32 V); monitored for undervoltage warning (VDD2_WRN) |
| GND1 / GND2 | Logic / switch ground | Galvanically separated grounds; mandatory physical separation on PCB to maintain isolation integrity |
| A1–A4 | Parallel input control | Direct logic-level enable for each channel; high = ON, low = OFF (active-high parallel mode) |
| B1–B4 | High-side switch outputs | Source current to load; each rated for 0.7 A continuous, 8 A inrush; includes built-in clamp and protection |
| OE | Output enable | Asynchronous global disable; pulls all Bx outputs low when low, overriding individual Ax inputs |
| VDD2_WRN | Open-drain warning indicator | Active-low signal asserted when VDD2 drops below warning threshold (VDD2UV9); used for system-level supply monitoring |
| OPEN_CH | Open-drain open-channel indicator | Active-low signal asserted when any channel detects open-circuit load condition; enables predictive maintenance |
| FLT | Open-drain fault indicator | Active-low aggregate fault flag; latched until cleared via FLT_CLR or power cycle; covers over-temp, over-current, comm error |
Key Features
| Feature | Design Value |
|---|---|
| Inrush Current Mode | Enables 8 A peak for 20 ms per channel to safely energize cold incandescent lamps without tripping protection |
| Multi-voltage smart clamp | Handles unlimited demagnetization energy (EAS) while maintaining fast turn-OFF & reducing contact arcing in relay coils |
| VDD2 warning indicator (VDD2_WRN) | Provides early alert before VDD2 enters undervoltage shutdown, allowing host controller to initiate graceful response |
| Open-channel detection (OPEN_CH) | Identifies broken-wire or disconnected load conditions per channel, supporting predictive diagnostics in safety-critical systems |
| Eight SPI-accessible diagnostics | Delivers granular visibility into supply status, over-temperature, over-current, open-circuit, and SPI communication errors |
Applications
| Programmable Logic Controller (PLC) Output Module | Industrial Data Acquisition System |
|---|---|
Use Scenario: Driving 24 V DC solenoid valves and indicator lamps in modular PLC backplanes with DIN-rail mounting. IC Role / Device Role / Timing Role: High-side load switch with galvanic isolation, real-time fault reporting, and inrush support for lamp loads. Use Value: Eliminates need for external optocouplers and discrete protection circuitry while enabling diagnostics via SPI or indicator pins. |
Use Scenario: Remote sensor actuation and status feedback in distributed I/O nodes connected via RS-485 or EtherCAT. IC Role / Device Role / Timing Role: Isolated output driver with VDD2_WRN and OPEN_CH indicators for supply health and wiring integrity monitoring. Use Value: Reduces field service time by identifying open-load faults before system failure and enabling remote configuration via SPI. |
| Motion Controller Axis Interface | Smart Solid-State Relay Replacement |
Use Scenario: Controlling brake coils and limit-switch actuators in servo drive cabinets where EMI immunity is critical. IC Role / Device Role / Timing Role: High-CMTI (>100 kV/µs) isolated switch with fast 10 µs update rate and thermal derating awareness. Use Value: Prevents spurious tripping during motor commutation noise events while supporting precise timing-critical sequencing. |
Use Scenario: Replacing electromechanical relays in HVAC control panels and building automation systems. IC Role / Device Role / Timing Role: Solid-state high-side switch with unlimited EAS handling and no contact wear or bounce. Use Value: Extends service life beyond 10 million cycles and eliminates arcing-related fire risk in enclosed enclosures. |
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 |
|---|---|---|---|
| SI83404AAA-IFR | Same 4-channel high-side topology, but includes channel status indicators (LED1–LED4) instead of VDD2_WRN and OPEN_CH | Preferred where per-channel visual status is required on front-panel displays; lacks supply warning and open-load detection | Select SI83404ACA-IFR when VDD2 supply monitoring and open-wiring diagnostics are prioritized over per-channel LED feedback |
| SI83404BCA-IFR | Identical pinout and electrical specs, but omits VDD2_WRN and OPEN_CH indicators; retains FLT and OE functionality | Suitable for cost-sensitive designs where only aggregate fault signaling is needed, not supply or wiring diagnostics | Choose SI83404ACA-IFR when early warning of marginal VDD2 or open-load conditions is required for system reliability |
Compared with SI83404AAA-IFR and SI83404BCA-IFR, the SI83404ACA-IFR uniquely provides both VDD2_WRN and OPEN_CH open-drain indicators - enabling proactive power rail supervision and predictive wiring integrity checks without adding external comparators or sensors.
Availability
SI83404ACA-IFR is available at Aetrix Electronics and suitable for industrial programmable logic controllers, motion control interfaces, and smart solid-state relay replacements requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SI83404ACA-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 reinforced isolation, comprehensive diagnostics, and seamless migration from optocoupler-based relay drivers - with SI83404ACA-IFR targeting high-reliability PLC output stages.
FAQ
What is the isolation architecture used in the SI83404ACA-IFR?
The SI83404ACA-IFR uses Skyworks' proprietary RF-based CMOS isolation technology across a reinforced dielectric barrier, delivering 1.5 kVRMS safety rating and >100 kV/µs common-mode transient immunity - eliminating LED aging and CMTI limitations inherent in optocouplers while enabling faster propagation and tighter timing control than capacitive isolation.
Does the SI83404ACA-IFR support both parallel and SPI interfaces simultaneously?
No - the SI83404ACA-IFR is configured for parallel-only interface (A1–A4 inputs + OE) with diagnostic reporting via dedicated pins (VDD2_WRN, OPEN_CH, FLT). It does not include MOSI/MISO/SCLK pins; SPI capability is reserved for variants ending in 'D' or 'F' (e.g., SI83408BDA-IFR), not the 'C' suffix in SI83404ACA-IFR.
How does the Inrush Current Mode function in the SI83404ACA-IFR?
The SI83404ACA-IFR's Inrush Current Mode delivers 8 A peak for up to 20 ms upon channel activation, specifically engineered to handle cold-filament lamp surge without triggering overcurrent protection. This mode is enabled by default in SI83404ACA-IFR and requires no SPI configuration - it activates automatically on rising edge of A1–A4.
What diagnostic signals are exposed on pins for the SI83404ACA-IFR?
The SI83404ACA-IFR exposes three dedicated open-drain diagnostic pins: VDD2_WRN (active-low warning when switch supply drops below threshold), OPEN_CH (active-low when any channel detects open-circuit load), and FLT (active-low aggregate fault flag covering over-temperature, over-current, and communication errors).
Is the SI83404ACA-IFR RoHS compliant and qualified for industrial temperature range?
Yes - the SI83404ACA-IFR is RoHS compliant and fully qualified for −40 °C to +125 °C operating junction temperature. Its DFN-32 package with exposed thermal pad supports reliable thermal dissipation in sealed industrial enclosures, and all specifications in the datasheet are validated across this full range.
SI83404ACA-IFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si834x
- Package/Case:
- 32-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- Yes
- 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):
- 3.5µs, 4.5µs
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 2µs, -
- Voltage - Supply:
- 2.25V ~ 5.5V, 9V ~ 32V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (9x9)
SI83404ACA-IFR FAQ
1.How can I place an order for SI83404ACA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83404ACA-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 SI83404ACA-IFR reliable?
The price and inventory of SI83404ACA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83404ACA-IFR is usually 5 days.
3.What payment methods are accepted for SI83404ACA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83404ACA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83404ACA-IFR?
SI83404ACA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83404ACA-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 SI83404ACA-IFR?
For technical support, including SI83404ACA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83404ACA-IFR requirements.
6.How does Aetrix verify that SI83404ACA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83404ACA-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 SI83404ACA-IFR meets industry standards.
7.What is the process for return or replacement of SI83404ACA-IFR?
All SI83404ACA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83404ACA-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 SI83404ACA-IFR part is unused and in its original packaging.
Return procedure for SI83404ACA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83404ACA-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.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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