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Skyworks Solutions Inc. SI83405BFA-IFR
- Part No.:
- SI83405BFA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83405BFA-IFR.pdf
- Description:
- 1 CH, ISOLATED SMART SWITCH, SOU
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
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Product details
Overview
SI83405BFA-IFR from Skyworks Solutions is a 1-channel isolated high-side smart switch with 2.5 A continuous current capability, 155 mΩ RON, and 1.5 kVRMS safety-rated CMOS isolation. It operates from 2.25–5.5 V logic supply and 9–32 V switch supply, delivering fast 10 µs update rate and full fault protection for industrial solenoid, relay, and lamp driving in PLC I/O modules.
For engineers reviewing the SI83405BFA-IFR datasheet, SI83405BFA-IFR pinout, SI83405BFA-IFR application, or SI83405BFA-IFR equivalent, this page delivers verified specifications, SPI/parallel dual-interface behavior, multi-voltage clamp EAS handling, inrush current mode (8 A/20 ms), and eight diagnostics-including open-circuit, overcurrent, overtemperature, and supply monitoring-critical for functional safety design in IEC 61131-2-compliant systems.
Technical Context
The SI83405BFA-IFR implements a single high-side switch with galvanic isolation via RF-modulated CMOS barrier, enabling independent logic and power domain operation. Its dual-interface architecture supports both parallel control (via dedicated input pins) and SPI-based diagnostics, with separate isolation channels for control and status reporting.
It integrates precision voltage, current, and temperature sensors per channel, feeding a real-time protection engine that enforces current limiting, undervoltage lockout, and thermal shutdown. The smart output clamp provides unlimited demagnetization energy (EAS) handling while maintaining fast turn-OFF for inductive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | High-side sourcing switch with open-source configuration |
| Continuous Current | 2.5 A - supports heavy-duty solenoids and relays without external heatsinking at 125°C ambient |
| RON | 155 mΩ - minimizes conduction loss and self-heating under full load |
| Logic Supply Range | 2.25–5.5 V - compatible with low-power MCUs including 2.5 V and 3.3 V systems |
| Switch Supply Range | 9–32 V - matches standard industrial 24 V DC bus with ±20% tolerance |
| Update Rate | 10 µs - enables high-speed cyclic control in motion and safety-critical I/O |
| Isolation Rating | 1.5 kVRMS - certified to UL 1577, CSA 62368-1, and GB4943.1 for reinforced insulation |
| CMTI | >100 kV/µs - ensures robust noise immunity in electrically noisy factory environments |
Pinout & Package
SI83405BFA-IFR is housed in a compact 9×9 mm DFN-32 package with exposed thermal pad, optimized for high-density industrial PCB layouts and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers digital interface; UVLO threshold at 2.1 V ensures clean MCU-level reset behavior |
| GND1 | Logic ground reference | Isolated return path for logic domain; must be separated from power ground |
| OE | Asynchronous output enable | Active-high global enable; forces all outputs OFF when low, independent of SPI or parallel inputs |
| A1 | Parallel input channel 1 | Direct logic-level control pin for high-side switch; supports 2.25–5.5 V CMOS-compatible signals |
| B1 | High-side switch output | Source terminal delivering up to 2.5 A; integrated clamp handles unlimited EAS during inductive turn-OFF |
| VDD2 | Switch supply input | Provides power to output stage; monitored for UV/OV faults across full 9–32 V range |
| GND2 | Power ground reference | Isolated return for switch domain; critical for maintaining CMTI and isolation integrity |
| FLT | Active-low fault indicator | Open-drain output asserting on any diagnostic fault (overcurrent, overtemp, open-load, comm error) |
| SCLK, MOSI, MISO, NSS | SPI interface signals | Full-duplex SPI port for reading 8 diagnostics, configuring protection thresholds, and clearing faults |
Key Features
| Feature | Design Value |
|---|---|
| Inrush Current Mode | Delivers 8 A for 20 ms to safely energize cold tungsten lamps without tripping overcurrent protection |
| Smart Output Clamp | Multi-voltage clamp architecture enables fast, efficient demagnetization of inductors while suppressing voltage spikes beyond 60 V |
| Dual Control Interface | Simultaneous parallel input (A1) and SPI access allow real-time switching + deep diagnostics without interface conflict |
| Eight Diagnostics | Reports VDD1/VDD2 status, overcurrent, overtemperature, open-circuit, communication error, and more via SPI registers or FLT pin |
| IEC 61131-2 Compliance | Meets Type 1/Type 3 input/output requirements for programmable controllers, including response time and noise immunity |
| Thermal Protection | Integrated die temperature sensor triggers gradual current derating before hard shutdown, preserving system uptime |
Applications
| Programmable Logic Controller (PLC) Output Module | Industrial Motion Controller I/O |
|---|---|
Use Scenario: Driving 24 V DC solenoid valves and contactor coils in modular PLC backplanes with distributed I/O. IC Role / Device Role / Timing Role: High-side smart switch providing isolated, protected, and diagnosable output channel with 10 µs update rate. Use Value: Eliminates need for discrete protection circuitry and optocouplers, reducing BOM count by 40% and enabling predictive maintenance via open-circuit detection. | Use Scenario: Controlling stepper motor enable lines and brake release circuits in servo drives requiring fail-safe shutdown. IC Role / Device Role / Timing Role: Safety-monitored high-side switch with overtemperature constraint and asynchronous OE-driven emergency stop. Use Value: Enables SIL-2-capable output stages through real-time thermal derating and fault-latched FLT signaling to host controller. |
| Smart Solid-State Relay (SSR) Board | Industrial Data Acquisition Front-End |
Use Scenario: Replacing electromechanical relays in DIN-rail mounted SSRs for HVAC and lighting control panels. IC Role / Device Role / Timing Role: Single-channel isolated high-side driver with inrush mode for lamp loads and EAS clamp for inductive ballasts. Use Value: Achieves >100M cycle lifetime vs. 100k mechanical cycles, with zero contact arcing and no moving parts wear-out. | Use Scenario: Conditioning and isolating analog sensor excitation outputs (e.g., RTD bias, strain gauge bridges) in rugged data loggers. IC Role / Device Role / Timing Role: Precision-controlled high-side current source with supply monitoring and open-load detection. Use Value: Detects broken sensor wires in real time and reports via SPI, preventing false readings and enabling automatic calibration retry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side smart switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83405BDA-IF | SPI-only interface; no parallel input (A1) or OE pin | Lacks direct hardware control; requires full SPI initialization before operation | Select when diagnostics dominate control and MCU firmware can manage full SPI sequencing |
| SI83405BAA-IF | Parallel-only interface; no SPI, no diagnostics reporting | No fault visibility; only basic ON/OFF control with VDD2_WRN warning pin | Select for cost-sensitive legacy optocoupler drop-in where diagnostics are not required |
Compared with SI83405BDA-IF and SI83405BAA-IF, the SI83405BFA-IFR uniquely combines parallel immediacy with SPI diagnostics-enabling both deterministic real-time control and comprehensive health monitoring in a single device without interface trade-offs.
Availability
SI83405BFA-IFR is available at Aetrix Electronics and suitable for industrial PLC output modules, motion controller I/O subsystems, and smart solid-state relay designs requiring stable component supply, long lifecycle support, and functional safety compliance.
Supply support for SI83405BFA-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 automation I/O, replacing optocouplers and discrete drivers with integrated, isolated, and diagnosable smart switches compliant with IEC 61131-2.
FAQ
What is the maximum continuous output current rating for SI83405BFA-IFR?
The SI83405BFA-IFR is rated for 2.5 A continuous output current at TA = 125°C with proper PCB thermal design. This rating applies to its single high-side switch channel and is validated under 9–32 V VDD2 supply with 155 mΩ RON. Derating curves in the datasheet define current limits at lower ambient temperatures or reduced copper area.
Does SI83405BFA-IFR support both parallel and SPI interfaces simultaneously?
Yes, SI83405BFA-IFR supports concurrent parallel and SPI operation: the A1 pin accepts direct logic-level control while SCLK/MOSI/MISO/NSS provide full bidirectional diagnostics access. Control signals and status reporting use independent isolation channels, eliminating interference between real-time switching and diagnostic reads.
How does the inrush current mode function in SI83405BFA-IFR?
The SI83405BFA-IFR's inrush current mode delivers 8 A for up to 20 ms upon channel activation, specifically engineered for cold tungsten lamp filaments. This mode is automatically engaged during initial turn-on and disabled once steady-state current is reached, preventing false overcurrent trips while ensuring reliable lamp ignition.
What isolation certifications apply to SI83405BFA-IFR?
SI83405BFA-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 reinforced insulation requirements for industrial equipment operating in harsh electromagnetic environments.
Can SI83405BFA-IFR detect open-circuit conditions on its load?
Yes, SI83405BFA-IFR provides open-circuit detection as one of its eight diagnostics. When enabled, it monitors output voltage during OFF state and reports "open channel" via SPI register bit OPEN_CH and asserts FLT if the condition persists. This feature is configurable and supports predictive maintenance in PLC and SSR applications.
SI83405BFA-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:
- 1
- Inputs - Side 1/Side 2:
- 1/0
- Channel Type:
- Bidirectional, 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)
SI83405BFA-IFR FAQ
1.How can I place an order for SI83405BFA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83405BFA-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 SI83405BFA-IFR reliable?
The price and inventory of SI83405BFA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83405BFA-IFR is usually 5 days.
3.What payment methods are accepted for SI83405BFA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83405BFA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83405BFA-IFR?
SI83405BFA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83405BFA-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 SI83405BFA-IFR?
For technical support, including SI83405BFA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83405BFA-IFR requirements.
6.How does Aetrix verify that SI83405BFA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83405BFA-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 SI83405BFA-IFR meets industry standards.
7.What is the process for return or replacement of SI83405BFA-IFR?
All SI83405BFA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83405BFA-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 SI83405BFA-IFR part is unused and in its original packaging.
Return procedure for SI83405BFA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83405BFA-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
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ISO7721FDR
Texas Instruments
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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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