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Skyworks Solutions Inc. SI83406BFA-IF
- Part No.:
- SI83406BFA-IF
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83406BFA-IF.pdf
- Description:
- 2 CH, ISOLATED SMART SWITCH, SOU
- Quantity:
- Payment:
- Shipping:
Inventory:4,229
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Product details
Overview
SI83406BFA-IF from Skyworks Solutions is a 2-channel isolated smart high-side switch IC for industrial control, featuring galvanic isolation up to 1.5 kVRMS, 1.25 A continuous output current per channel, 78 mΩ RON, and 9–32 V switch supply voltage. It integrates fault protection, diagnostics, and parallel/SPI interface for driving solenoids, relays, and lamps in PLCs.
For engineers reviewing the SI83406BFA-IF datasheet, SI83406BFA-IF pinout, SI83406BFA-IF application, or SI83406BFA-IF equivalent, this page delivers verified specifications, package mapping, real-world use scenarios, diagnostic reporting behavior, and validated alternative parts for industrial solid-state relay and motion controller designs.
Technical Context
The SI83406BFA-IF implements two independent high-side switches with CMOS-based RF isolation, delivering 1.25 A continuous current at 78 mΩ RON and supporting 9–32 V load supply. Its logic interface operates from 2.25–5.5 V and accepts parallel control signals plus asynchronous OE, with no SPI interface enabled per ordering guide.
Each channel includes integrated overcurrent, overtemperature, and undervoltage protection, with eight diagnostic reports accessible only via dedicated indicator pins-not SPI-since this variant lacks MOSI/MISO/NSS/SCLK pins. Fault status is reported through active-low open-drain FLT and channel-specific LED outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 2 independent high-side switches with isolated control paths |
| Continuous Output Current | 1.25 A per channel - supports industrial solenoid and relay loads without external heatsinking |
| RON (per channel) | 78 mΩ - minimizes power loss and thermal rise at full rated current |
| Switch Supply Range | 9 V–32 V - compatible with standard 24 V DC industrial bus systems |
| Logic Supply Range | 2.25 V–5.5 V - interfaces directly with low-voltage MCUs including ARM Cortex-M series |
| Isolation Rating | 1.5 kVRMS - certified for functional safety in IEC 61131-2 compliant PLC modules |
| CMTI | >100 kV/µs - ensures robust operation in noisy factory environments with fast transients |
Pinout & Package
SI83406BFA-IF is housed in a compact 9 mm × 9 mm DFN-32 package with exposed thermal pad, optimized for surface-mount assembly and thermal dissipation in dense industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers digital interface; accepts 2.25–5.5 V; internal UVLO at ~2.05 V |
| OE | Asynchronous output enable | Active-high global enable; forces all outputs OFF when low |
| GND1 | Logic ground reference | Reference for VDD1 and digital inputs; galvanically isolated from GND2 |
| A1, A2 | Parallel input channels | Direct logic-level control inputs for CH1 and CH2; no pull-up/pull-down required |
| B1, B2 | High-side switch outputs | Source current to load; each rated for 1.25 A continuous into 9–32 V supply |
| VDD2 | Switch supply input | Provides power to output stage; monitored for undervoltage warning and shutdown |
| GND2 | Power ground reference | Return path for load current; isolated from GND1; connects to system 24 V return |
| FLT | Fault indicator output | Active-low open-drain signal asserting any detected fault (overtemp, overcurrent, UV) |
| LED1, LED2 | Channel status indicators | Active-low open-drain outputs reflecting real-time ON/OFF state of B1/B2 |
| DNC, NC | No-connect terminals | Internally unused; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Galvanic RF isolation | 1.5 kVRMS rating with >100 kV/µs CMTI enables noise-immune operation in EMI-heavy PLC cabinets |
| Multi-voltage output clamp | Unlimited EAS handling safely dissipates inductive kickback without snubbers or external clamps |
| Channel-specific status reporting | LED1/LED2 provide immediate visual or logic-level feedback on B1/B2 output state without SPI polling |
| Integrated fault protection | Simultaneous monitoring of overcurrent, overtemperature, and VDD2 undervoltage with automatic shutdown |
| Industrial-grade operating range | -40 °C to +125 °C ambient allows deployment in uncontrolled enclosures and motor control cabinets |
Applications
| Programmable Logic Controllers (PLCs) | Industrial Motion Controllers |
|---|---|
Use Scenario: Replacing electromechanical relays in modular I/O cards for discrete output modules. IC Role / Device Role / Timing Role: High-side switch providing isolated 24 V DC drive to stepper driver enable lines and servo brake circuits. Use Value: Eliminates contact wear and bounce, enabling 10× longer service life and deterministic 10 µs switching vs. 10 ms relay settling. | Use Scenario: Driving holding brakes and safety interlock coils in CNC machine axes. IC Role / Device Role / Timing Role: Fail-safe output stage with undervoltage detection and immediate FLT assertion on power rail collapse. Use Value: Prevents unintended brake release during brownout events by forcing safe-off state within 100 µs of VDD2 drop below 9 V. |
| Smart Solid-State Relays | Industrial Data Acquisition Systems |
Use Scenario: Core switching element in DIN-rail mounted SSRs for HVAC zone control and pump staging. IC Role / Device Role / Timing Role: Dual-channel load driver with thermal foldback and open-circuit detection for predictive maintenance alerts. Use Value: Detects broken heater elements via open-channel diagnostics and reports via LED1/LED2 status pins without host MCU involvement. | Use Scenario: Isolated digital output for sensor excitation and actuator control in distributed I/O nodes. IC Role / Device Role / Timing Role: Galvanically isolated interface between low-voltage microcontroller and 24 V field-side actuators. Use Value: Breaks ground loops and prevents noise coupling from motor drives into sensitive analog measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83402BAA-IF | Same 2-channel high-side architecture, identical 1.25 A/78 mΩ rating, but uses parallel-only interface with VDD2_WRN pin instead of LED1/LED2 | Lacks per-channel status indicators; provides only global VDD2 undervoltage warning | Select when board space is constrained and only system-level supply monitoring is needed |
| SI83416BFA-IF | 2-channel low-side sinking variant with same package, pin count, and 1.25 A rating; shares identical fault reporting structure and LEDn/FLT pinout | Requires load connection to VDD2 instead of GND2; incompatible with high-side referenced sensors | Select when driving common-anode loads or interfacing with NPN-input logic systems |
Compared with SI83406BFA-IF, SI83402BAA-IF trades per-channel visibility for simpler supply monitoring, while SI83416BFA-IF reorients the current path for sink-driven topologies-both require PCB redesign due to differing load reference requirements and pin function allocation.
Availability
SI83406BFA-IF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial motion controllers, and smart solid-state relays requiring stable component supply across multi-year production cycles.
Supply support for SI83406BFA-IF 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 replacing optocoupler-relay hybrids in industrial automation, delivering integrated isolation, protection, and diagnostics in a single DFN package for PLC and motion control applications.
FAQ
What is the maximum continuous output current per channel for SI83406BFA-IF?
The SI83406BFA-IF delivers 1.25 A continuous output current per channel under typical conditions with adequate PCB copper area. This rating assumes operation at 25 °C ambient with 9–32 V VDD2 and accounts for internal thermal derating. The device sustains this current without external heatsinking in standard 4-layer FR-4 layouts meeting Skyworks' recommended thermal pad footprint.
Does SI83406BFA-IF support SPI communication for diagnostics?
No, SI83406BFA-IF does not support SPI communication. Per the official Skyworks ordering guide, the "BFA" suffix denotes the Parallel/SPI configuration option, but SI83406BFA-IF specifically implements only the parallel interface-MOSI, MISO, NSS, and SCLK pins are NC. Diagnostics are reported exclusively via FLT, LED1, and LED2 open-drain indicator pins.
What isolation rating and safety certifications apply to SI83406BFA-IF?
SI83406BFA-IF is rated for 1.5 kVRMS galvanic isolation and carries pending UL 1577 recognition (1500 Vrms, 1 minute), CSA 62368-1 certification, and CQC GB4943.1 approval. Its CMOS-based RF isolation achieves >100 kV/µs common-mode transient immunity, exceeding IEC 61131-2 requirements for industrial control equipment.
How does the fault reporting work on SI83406BFA-IF?
SI83406BFA-IF asserts the active-low FLT pin whenever any fault condition occurs-including overtemperature, overcurrent, or VDD2 undervoltage-and holds it asserted for the Clear Fault Delay (tCFD) period. Channel-specific status is provided via LED1 and LED2, which mirror the ON/OFF state of B1 and B2 independently, enabling hardware-level monitoring without software intervention.
Can SI83406BFA-IF drive inductive loads like solenoids directly?
Yes, SI83406BFA-IF is explicitly designed for inductive loads. Its integrated multi-voltage output clamp handles unlimited demagnetization energy (EAS), eliminating the need for external flyback diodes or RC snubbers. This allows direct connection to 24 V solenoids and relay coils while ensuring fast turn-OFF and contact arcing reduction in industrial valve and actuator applications.
SI83406BFA-IF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si834x
- Package/Case:
- 32-VFDFN Exposed Pad
- Packaging:
- Tray
- 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-IF FAQ
1.How can I place an order for SI83406BFA-IF through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83406BFA-IF 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-IF reliable?
The price and inventory of SI83406BFA-IF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83406BFA-IF is usually 5 days.
3.What payment methods are accepted for SI83406BFA-IF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83406BFA-IF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83406BFA-IF?
SI83406BFA-IF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83406BFA-IF 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-IF?
For technical support, including SI83406BFA-IF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83406BFA-IF requirements.
6.How does Aetrix verify that SI83406BFA-IF is sourced from the original manufacturer or authorized distributors?
All SI83406BFA-IF 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-IF meets industry standards.
7.What is the process for return or replacement of SI83406BFA-IF?
All SI83406BFA-IF units undergo pre-shipment inspection (PSI). If there is an issue with SI83406BFA-IF, 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-IF part is unused and in its original packaging.
Return procedure for SI83406BFA-IF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83406BFA-IF 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.
-
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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