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Skyworks Solutions Inc. SI83406BFA-IFR
- Part No.:
- SI83406BFA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83406BFA-IFR.pdf
- Description:
- 2 CH, ISOLATED SMART SWITCH, SOU
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
SI83406BFA-IFR from Skyworks Solutions is a dual-channel isolated smart high-side switch IC designed for industrial load control in PLC I/O modules and motion controllers. It delivers 1.25 A continuous current per channel, features 1.5 kVRMS galvanic isolation, supports 9–32 V switch supply and 2.25–5.5 V logic supply, and integrates full fault protection including overcurrent, overtemperature, and undervoltage monitoring.
For engineers reviewing the SI83406BFA-IFR datasheet, SI83406BFA-IFR pinout, SI83406BFA-IFR application, or SI83406BFA-IFR equivalent, this device offers SPI/parallel dual-interface flexibility, 10 µs update rate, multi-voltage output clamping for inductive loads, eight diagnostics accessible via SPI, and compact DFN-32 (9×9 mm) packaging suitable for space-constrained industrial PCBs.
Technical Context
The SI83406BFA-IFR implements two independent high-side switches with CMOS-based RF-isolation barrier, enabling robust signal transfer without optocoupler degradation. Each channel includes integrated voltage, current, and temperature sensing with real-time protection logic that constrains output or initiates controlled shutdown on fault detection.
It supports parallel input control with asynchronous OE pin and optional SPI interface for diagnostics-though SI83406BFA-IFR uses the "BFA" suffix indicating Parallel/SPI dual-mode capability per Table 1. Its smart output clamp handles unlimited demagnetization energy (EAS), ensuring fast turn-OFF and reduced contact arcing in solenoid and relay driving applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 2 independent high-side switches - enables dual-load control without external driver staging |
| Continuous Current | 1.25 A per channel at 78 mΩ RON - supports industrial resistive/inductive loads like valves and small relays |
| Isolation Rating | 1.5 kVRMS for 1 minute - meets UL 1577 and IEC 61131-2 safety requirements for functional isolation |
| Switch Supply Range | 9 V–32 V - compatible with standard 24 V DC industrial power rails and brown-out tolerant |
| Logic Supply Range | 2.25 V–5.5 V - interoperable with low-power MCUs including 3.3 V and 5 V systems |
| Update Rate | 10 µs - enables real-time response in closed-loop motion and safety-critical sequencing |
| CMTI | >100 kV/µs - prevents false triggering in noisy factory environments with fast transients |
Pinout & Package
SI83406BFA-IFR is housed in a compact 9×9 mm DFN-32 package with wettable flanks, optimized for automated optical inspection (AOI) and thermal performance in industrial PCB layouts.
| 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 |
| OE | Asynchronous output enable | Active-high global enable; overrides individual channel control during safety shutdown or reset sequences |
| GND1 | Logic ground reference | Reference for VDD1 and all digital pins; must be separated from GND2 to maintain isolation integrity |
| A1, A2 | Parallel input channels | Direct logic-level control inputs for CH1 and CH2; support TTL/CMOS-compatible voltage thresholds |
| B1, B2 | High-side switch outputs | Source-switched outputs rated for 1.25 A continuous; include integrated clamp and protection circuitry |
| VDD2 | Switch supply input | Provides power to high-side drivers (9–32 V); monitored for undervoltage warning and fault shutdown |
| GND2 | Power ground reference | Reference for VDD2 and switch outputs; galvanically isolated from GND1 by RF barrier |
| FLT | Active-low fault indicator | Open-drain output asserting on any detected fault (overcurrent, overtemp, UVLO); requires external pull-up |
| DNC / NC | No-connect / Not connected | Unused pins; must be left floating or tied to GND per layout guidelines to avoid noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Galvanic RF isolation | Replaces optocouplers with >100 kV/µs CMTI and no LED aging-ensures long-term reliability in 24/7 operation |
| Smart output clamp | Multi-voltage clamp absorbs unlimited EAS energy during inductive turn-OFF, enabling fast demagnetization without snubbers |
| Inrush Current Mode | Not enabled on SI83406BFA-IFR (per Ordering Guide Table 1) - simplifies lamp-driving designs where inrush limiting is unnecessary |
| Eight diagnostics via SPI | Reports open-circuit, overcurrent, overtemperature, VDD2 warning, communication errors, and supply faults-enables predictive maintenance |
| Asynchronous disable | OE pin forces immediate channel shutdown independent of SPI or parallel state-critical for emergency stop (E-Stop) integration |
| IEC 61131-2 compliance | Validated for programmable controller interfaces, supporting standardized industrial control system architecture and certification workflows |
Applications
| Programmable Logic Controllers (PLCs) | Industrial Motion Controllers |
|---|---|
|
Use Scenario: Digital output module in modular PLC backplane driving 24 V DC solenoids and indicator lamps. IC Role / Device Role / Timing Role: High-side switch providing isolated, protected load control with diagnostic feedback to PLC CPU via SPI. Use Value: Eliminates discrete optocoupler + MOSFET + protection circuits; reduces board area by 40% and improves MTBF through integrated fault handling. |
Use Scenario: Axis-specific I/O in servo drive control units managing brake release and limit switch supervision. IC Role / Device Role / Timing Role: Dual-channel isolated driver delivering synchronized, fault-monitored actuation signals to electromagnetic brakes and position sensors. Use Value: 10 µs update rate ensures tight coordination with motion profiles; FLT pin enables hardware-level interlock with safety relay chains. |
| Smart Solid-State Relays | Industrial Data Acquisition Systems |
|
Use Scenario: DIN-rail mounted SSR replacing electromechanical relays in HVAC and pump control panels. IC Role / Device Role / Timing Role: High-side switch delivering zero-crossing–free switching with built-in overtemperature and open-load detection. Use Value: Enables silent, bounce-free operation and remote health monitoring via SPI diagnostics-reducing field service visits by up to 35%. |
Use Scenario: Sensor excitation and actuator interface in distributed I/O nodes collecting analog/digital field data. IC Role / Device Role / Timing Role: Isolated load driver powering 4–20 mA loop exciters and status LEDs while reporting supply and channel faults. Use Value: Single-chip solution replaces three discrete components; GND1/GND2 separation prevents ground-loop noise in precision measurement paths. |
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 |
|---|---|---|---|
| SI83406BDA-IF | No SPI interface; parallel-only control; same 2-channel, 1.25 A, high-side configuration | Lacks diagnostic access via SPI; relies solely on FLT pin and OE for fault response | Select when diagnostics are handled externally or not required-reduces firmware complexity and BOM count |
| SI83416BFA-IF | 2-channel low-side sinking variant; identical package, isolation, and supply specs | Requires load referenced to VDD2 instead of GND2; suited for NPN-driven or common-anode topologies | Choose for legacy schematics using sink-switching architecture or when interfacing with open-collector sensor outputs |
Compared with SI83406BFA-IFR, SI83406BDA-IF removes SPI overhead for simpler deterministic control, while SI83416BFA-IF shifts to low-side topology-both retain identical thermal, isolation, and timing performance but differ in system-level grounding and diagnostic depth.
Availability
SI83406BFA-IFR is available at Aetrix Electronics and suitable for industrial automation, motion control, and programmable logic controller applications requiring stable component supply, long lifecycle assurance, and traceable sourcing for production ramp.
Supply support for SI83406BFA-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 engineered to replace optocoupler-based relay drivers with higher reliability, faster timing, and integrated diagnostics-targeting next-generation industrial I/O modules and smart power distribution systems.
FAQ
What is the isolation architecture used in the SI83406BFA-IFR?
The SI83406BFA-IFR employs Skyworks' proprietary CMOS-based RF isolation technology, modulating a radio-frequency carrier across a silicon-dioxide barrier. This architecture achieves 1.5 kVRMS isolation rating and >100 kV/µs common-mode transient immunity-eliminating LED aging and performance drift associated with optocouplers while maintaining compatibility with existing PCB layouts.
Does the SI83406BFA-IFR support inrush current mode for lamp loads?
No, the SI83406BFA-IFR does not include Inrush Current Mode. Per Skyworks' Ordering Guide (Table 1), only variants with "AAA", "ADA", or "AFA" suffixes enable this 8 A / 20 ms feature. SI83406BFA-IFR is configured for standard continuous-current operation at 1.25 A per channel, making it ideal for solenoids, valves, and other non-lamp inductive loads.
How many diagnostic reports does the SI83406BFA-IFR provide, and how are they accessed?
The SI83406BFA-IFR provides eight distinct diagnostic reports-including overcurrent, overtemperature, open-circuit, VDD2 warning, and communication errors-accessible exclusively via its SPI interface. These diagnostics reside in status registers readable by the host MCU; no parallel-pin equivalents are provided on this variant, requiring SPI firmware integration for full visibility.
What is the recommended PCB layout practice for grounding the SI83406BFA-IFR?
SI83406BFA-IFR requires strict separation of GND1 (logic ground) and GND2 (power ground) with no direct copper connection between them. A split ground plane or isolated ground islands must be used, with isolation barrier clearance ≥0.5 mm. VDD1 and VDD2 supplies must be decoupled locally using 100 nF ceramic capacitors placed within 3 mm of their respective pins to ensure noise immunity and startup stability.
Can the SI83406BFA-IFR drive both resistive and inductive loads?
Yes, the SI83406BFA-IFR is explicitly qualified for both resistive and inductive loads, including solenoids, relays, and lamps. Its integrated multi-voltage smart output clamp safely dissipates unlimited demagnetization energy (EAS) during inductive turn-OFF, enabling fast, snubber-free switching without voltage overshoot-verified per IEC 61131-2 surge and transient immunity standards.
SI83406BFA-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:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- 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)
SI83406BFA-IFR FAQ
1.How can I place an order for SI83406BFA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83406BFA-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 SI83406BFA-IFR reliable?
The price and inventory of SI83406BFA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83406BFA-IFR is usually 5 days.
3.What payment methods are accepted for SI83406BFA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83406BFA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83406BFA-IFR?
SI83406BFA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83406BFA-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 SI83406BFA-IFR?
For technical support, including SI83406BFA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83406BFA-IFR requirements.
6.How does Aetrix verify that SI83406BFA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83406BFA-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 SI83406BFA-IFR meets industry standards.
7.What is the process for return or replacement of SI83406BFA-IFR?
All SI83406BFA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83406BFA-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 SI83406BFA-IFR part is unused and in its original packaging.
Return procedure for SI83406BFA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83406BFA-IFR Tags
-
ISO1212DBQR
Texas Instruments
-
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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