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Skyworks Solutions Inc. SI83404BBA-IFR

Name: SI83404BBA-IFR
Brand: Skyworks Solutions Inc.
SKU: SI83404BBA-IFR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI83404BBA-IFR

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 32-VFDFN Exposed Pad

Datasheet:: SI83404BBA-IFR.pdf

Description:: FOUR CHANNEL SOURCING OUTPUT WIT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI83404BBA-IFR from Skyworks Solutions is a 4-channel isolated smart high-side switch IC with galvanic CMOS isolation, 0.7 A continuous output per channel, 155 mΩ R_ON, 9–32 V switch supply, and 2.25–5.5 V logic supply-designed for driving solenoids, relays, and lamps in industrial PLC I/O modules.

For engineers reviewing the SI83404BBA-IFR datasheet, SI83404BBA-IFR pinout, SI83404BBA-IFR application, or SI83404BBA-IFR equivalent, key selection considerations include its parallel-only interface (no SPI), absence of Inrush Current Mode, presence of open-channel indicator (OPEN_CH), and dedicated low-voltage warning (VDD2_WRN) for 9–32 V industrial power rails.

Technical Context

The SI83404BBA-IFR implements four independent high-side switches with integrated voltage, current, and temperature sensing, each featuring a multi-voltage smart output clamp for unlimited EAS handling and fast turn-OFF. Its isolation barrier uses RF modulation instead of optical coupling, delivering >100 kV/µs CMTI and 1.5 kV_RMS safety rating.

Control is via parallel digital inputs and asynchronous OE pin; diagnostics are reported through active-low open-drain pins (FLT, VDD2_WRN, OPEN_CH, LED1–LED4), not SPI-distinguishing it from SPI-capable Si834x variants. Fault responses include current-limited overload protection, over-temperature shutdown, and undervoltage lockout on both VDD1 and VDD2 supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Channels	4 independent high-side switches-enables consolidated control of multiple industrial loads without external drivers.
Continuous Output Current	0.7 A per channel-supports typical solenoid and relay coils in PLC output modules without derating at 125 °C ambient.
R_ON	155 mΩ max at 25 °C-minimizes conduction loss and self-heating under full load (0.076 W/channel at 0.7 A).
Switch Supply Range	9 V–32 V-compatible with standard industrial DC bus voltages including 12 V, 24 V, and 32 V systems.
Logic Supply Range	2.25 V–5.5 V-interfacing directly with low-power MCUs (e.g., ARM Cortex-M0+) without level-shifting.
Isolation Rating	1.5 kV_RMS for 1 minute-meets UL 1577 recognition and supports functional isolation in IEC 61131-2 compliant controllers.
Operating Temperature	−40 °C to +125 °C-ensures reliable operation in harsh industrial enclosures and uncontrolled ambient environments.

Pinout & Package

SI83404BBA-IFR is housed in 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	Powers internal digital circuitry and isolation transmitter; requires 2.25–5.5 V with bypass capacitor.
VDD2	Switch supply input	Provides power to all four high-side output stages; accepts 9–32 V with overvoltage/undervoltage monitoring.
GND1 / GND2	Logic / switch ground	Galvanically separated grounds-mandatory physical separation on PCB to maintain isolation integrity.
A1–A4	Parallel input channels	Direct TTL/CMOS-compatible control inputs for each switch; high = ON, low = OFF.
OE	Output enable	Asynchronous global disable-forces all outputs OFF regardless of A1–A4 states when pulled low.
B1–B4	High-side switch outputs	Source current to loads; each rated for 0.7 A continuous, 155 mΩ R_ON, with built-in fault protection.
FLT	Fault indicator	Active-low open-drain output asserting when any monitored fault (overcurrent, overtemp, UVLO) is detected.
VDD2_WRN	Switch supply low-voltage warning	Active-low open-drain signal indicating VDD2 is below warning threshold (≈9 V), enabling early system response.
OPEN_CH	Open-circuit detection indicator	Active-low open-drain output asserted when any channel detects an open-load condition (e.g., broken wire).
LED1–LED4	Channel status indicators	Active-low open-drain outputs mirroring B1–B4 states-directly drive LEDs for visual I/O status feedback.

Key Features

Feature	Design Value
Galvanic CMOS isolation	Replaces optocouplers with >100 kV/µs CMTI and 1.5 kV_RMS rating-eliminates LED aging and improves long-term timing stability.
Smart output clamp	Multi-voltage clamp handles unlimited demagnetization energy (EAS)-prevents voltage spikes during inductive turn-OFF without snubbers.
Parallel-only interface	No SPI required-simplifies firmware, reduces MCU GPIO count, and enables drop-in replacement for legacy optocoupler+driver designs.
Comprehensive fault reporting	Eight diagnostics (via pin asserts): FLT, VDD2_WRN, OPEN_CH, and LEDn-enables real-time field diagnostics without host processor overhead.
Industrial-grade protection	Integrated overcurrent, overtemperature, open-load, and dual-supply UVLO-reduces need for external protection components in PLC output stages.

Applications

Programmable Logic Controller (PLC) Output Modules	Industrial Data Acquisition Systems
Use Scenario: Driving 24 V DC solenoid valves and relay coils in modular PLC backplanes with space-constrained DIN-rail mounting. IC Role / Device Role / Timing Role: High-side switch providing galvanically isolated, current-limited load control with real-time fault signaling via FLT and OPEN_CH pins. Use Value: Eliminates discrete optocoupler + MOSFET driver combinations, reducing BOM count by ≥3 parts per channel while improving reliability and CMTI.	Use Scenario: Remote I/O nodes acquiring sensor data and controlling actuators in factory automation networks with distributed 24 V power rails. IC Role / Device Role / Timing Role: Isolated output stage translating microcontroller logic signals into robust 24 V load switching with VDD2_WRN warning for brownout detection. Use Value: Enables predictive maintenance via OPEN_CH assertion on wire break, reducing unplanned downtime in mission-critical DAQ systems.
Motion Controller I/O Expansion	Smart Solid-State Relay Replacement
Use Scenario: Adding auxiliary digital outputs to servo drive controllers for brake release, cooling fan control, or limit switch supervision. IC Role / Device Role / Timing Role: Four-channel high-side driver with fast 10 µs update rate and OE-controlled global disable for synchronized safety shutdown. Use Value: Supports SIL-2 functional safety architecture via independent fault reporting (FLT, VDD2_WRN) and guaranteed safe state on power loss.	Use Scenario: Replacing electromechanical relays in HVAC control panels where silent operation, long life, and zero contact bounce are required. IC Role / Device Role / Timing Role: Solid-state alternative with 0.7 A per channel, 155 mΩ R_ON, and built-in overcurrent limiting-no external fusing needed. Use Value: Achieves >10⁸ operations lifetime versus ~10⁵ for mechanical relays, with no arcing or contact wear in inductive load switching.

Programmable Logic Controller (PLC) Output Modules

Industrial Data Acquisition Systems

Use Scenario: Driving 24 V DC solenoid valves and relay coils in modular PLC backplanes with space-constrained DIN-rail mounting.

IC Role / Device Role / Timing Role: High-side switch providing galvanically isolated, current-limited load control with real-time fault signaling via FLT and OPEN_CH pins.

Use Value: Eliminates discrete optocoupler + MOSFET driver combinations, reducing BOM count by ≥3 parts per channel while improving reliability and CMTI.

Use Scenario: Remote I/O nodes acquiring sensor data and controlling actuators in factory automation networks with distributed 24 V power rails.

IC Role / Device Role / Timing Role: Isolated output stage translating microcontroller logic signals into robust 24 V load switching with VDD2_WRN warning for brownout detection.

Use Value: Enables predictive maintenance via OPEN_CH assertion on wire break, reducing unplanned downtime in mission-critical DAQ systems.

Motion Controller I/O Expansion

Smart Solid-State Relay Replacement

Use Scenario: Adding auxiliary digital outputs to servo drive controllers for brake release, cooling fan control, or limit switch supervision.

IC Role / Device Role / Timing Role: Four-channel high-side driver with fast 10 µs update rate and OE-controlled global disable for synchronized safety shutdown.

Use Value: Supports SIL-2 functional safety architecture via independent fault reporting (FLT, VDD2_WRN) and guaranteed safe state on power loss.

Use Scenario: Replacing electromechanical relays in HVAC control panels where silent operation, long life, and zero contact bounce are required.

IC Role / Device Role / Timing Role: Solid-state alternative with 0.7 A per channel, 155 mΩ R_ON, and built-in overcurrent limiting-no external fusing needed.

Use Value: Achieves >10⁸ operations lifetime versus ~10⁵ for mechanical relays, with no arcing or contact wear in inductive load switching.

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
SI83404BAA-IFR	Same 4-channel high-side configuration, but includes Inrush Current Mode (8 A for 20 ms) and LEDn indicators only-no VDD2_WRN or OPEN_CH.	Suitable for lamp loads requiring high inrush tolerance; lacks open-circuit and low-VDD2 warnings critical for predictive maintenance.	Select SI83404BAA-IFR only if lamp-driving capability is prioritized over diagnostic completeness.
SI83414BAA-IFR	4-channel low-side sinking variant with identical pinout and specs-requires load connection to VDD2 instead of ground.	Used when load common is tied to positive rail (e.g., automotive body control); incompatible with high-side referenced PLC architectures.	Choose SI83414BAA-IFR only for low-side topologies-verify load grounding scheme before substitution.

Compared with SI83404BBA-IFR, SI83404BAA-IFR adds inrush support but removes two critical diagnostics, while SI83414BAA-IFR changes output topology entirely-neither is pin-compatible, and both require PCB layout and firmware logic adjustments.

Availability

SI83404BBA-IFR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data acquisition systems, and motion controller I/O expansion requiring stable component supply across extended product lifecycles.

Supply support for SI83404BBA-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 family was designed specifically to replace optocoupler-based relay drivers in industrial control systems-delivering higher reliability, faster timing, and richer diagnostics in a single IC.

FAQ

What is the maximum continuous output current per channel for the SI83404BBA-IFR?

The SI83404BBA-IFR delivers up to 0.7 A continuous current per channel at 25 °C ambient, derating linearly to 0.5 A at 125 °C. This rating is validated across the full 9–32 V switch supply range and accounts for internal thermal limits and R_ON (155 mΩ max), making it suitable for standard 24 V solenoid and relay loads in industrial environments.

Does the SI83404BBA-IFR support SPI communication for diagnostics?

No, the SI83404BBA-IFR does not support SPI. It uses a parallel-only interface with dedicated open-drain diagnostic pins (FLT, VDD2_WRN, OPEN_CH, LED1–LED4). Unlike SPI-capable Si834x variants (e.g., SI83408BDA-IFR), this part relies entirely on hardware pin asserts for fault reporting-simplifying firmware but limiting diagnostic granularity.

What isolation rating and safety certifications apply to the SI83404BBA-IFR?

The SI83404BBA-IFR provides 1.5 kV_RMS galvanic isolation per UL 1577 (recognized), complies with IEC 61131-2 for industrial controllers, and meets CSA 62368-1 and CQC GB4943.1 safety requirements. Its CMOS-based RF isolation achieves >100 kV/µs common-mode transient immunity-exceeding optocoupler performance in electrically noisy factory settings.

Can the SI83404BBA-IFR drive inductive loads like solenoids without external clamping components?

Yes. The SI83404BBA-IFR integrates a multi-voltage smart output clamp that safely dissipates unlimited demagnetization energy (EAS) during inductive turn-OFF. This eliminates the need for external flyback diodes or RC snubbers when switching solenoids, relays, or other inductive loads-reducing board area and component count.

What is the function of the OPEN_CH pin on the SI83404BBA-IFR?

The OPEN_CH pin is an active-low open-drain indicator that asserts when any of the four output channels detects an open-circuit condition-such as a broken wire or disconnected load. This enables immediate field-level fault identification without polling registers, supporting predictive maintenance in PLC and DAQ systems where load continuity is mission-critical.

SI83404BBA-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:: 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)

SI83404BBA-IFR FAQ

1.How can I place an order for SI83404BBA-IFR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI83404BBA-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 SI83404BBA-IFR reliable?

The price and inventory of SI83404BBA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83404BBA-IFR is usually 5 days.

3.What payment methods are accepted for SI83404BBA-IFR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83404BBA-IFR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI83404BBA-IFR?

SI83404BBA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI83404BBA-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 SI83404BBA-IFR?

For technical support, including SI83404BBA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83404BBA-IFR requirements.

6.How does Aetrix verify that SI83404BBA-IFR is sourced from the original manufacturer or authorized distributors?

All SI83404BBA-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 SI83404BBA-IFR meets industry standards.

7.What is the process for return or replacement of SI83404BBA-IFR?

All SI83404BBA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83404BBA-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 SI83404BBA-IFR part is unused and in its original packaging.

Return procedure for SI83404BBA-IFR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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