My Inquiry
My Account
Skyworks Solutions Inc. SI83408BDA-IFR
- Part No.:
- SI83408BDA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83408BDA-IFR.pdf
- Description:
- 4 CH. ISOLATED SMART SWITCH, SOU
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI83408BDA-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, 9–32 V switch supply, 2.25–5.5 V logic supply, and SPI interface for diagnostics. It drives industrial inductive/resistive loads such as solenoids and relays in PLC I/O modules.
For engineers reviewing the SI83408BDA-IFR datasheet, SI83408BDA-IFR pinout, SI83408BDA-IFR application, or SI83408BDA-IFR equivalent, key selection considerations include its 4-channel high-side sourcing capability, 1.5 kVRMS safety isolation, 100 kV/µs CMTI, fault reporting via SPI, and compatibility with 2.25 V MCUs in harsh industrial environments.
Technical Context
The SI83408BDA-IFR implements four independent high-side switches with integrated voltage, current, and temperature sensing, each controlled via isolated SPI channels. Its RF-based CMOS isolation barrier enables 10 µs update rate and eliminates optocoupler aging limitations.
It features a multi-voltage smart output clamp for unlimited EAS handling and fast turn-OFF, plus dedicated undervoltage monitoring for both VDD1 (logic) and VDD2 (switch) supplies. Fault detection includes overcurrent, overtemperature, open-circuit, and communication error - all reported through eight diagnostic registers accessible via SPI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent high-side sourcing switches |
| Continuous Current | 0.7 A per channel at 155 mΩ RON - supports solenoid/relay drive without external heatsinking |
| Isolation Rating | 1.5 kVRMS - certified to UL 1577, CSA 62368-1, GB4943.1 for functional safety in industrial systems |
| CMTI | >100 kV/µs - ensures reliable operation in noisy motor control or power conversion environments |
| Logic Supply | 2.25–5.5 V - directly interfaces low-power 2.25 V MCUs without level-shifting |
| Switch Supply | 9–32 V - matches standard industrial 24 V DC bus with margin for transients |
| Interface | SPI-only - enables full diagnostics, configuration, and status readback without parallel control pins |
| Operating Temp | −40 °C to +125 °C - qualified for extended temperature range in cabinet-mounted PLC modules |
Pinout & Package
SI83408BDA-IFR is housed in a compact 9 mm × 9 mm DFN-32 package with exposed thermal pad, optimized for high-density industrial PCB layouts and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers internal digital circuitry and SPI interface; accepts 2.25–5.5 V |
| VDD2 | Switch supply input | Powers all four high-side drivers; accepts 9–32 V; monitored for UVLO |
| GND1 / GND2 | Logic / switch ground | Galvanically isolated grounds - mandatory separation for safety and noise immunity |
| B1–B4 | High-side switch outputs | Source current to load; each rated 0.7 A continuous; integrated clamp handles EAS |
| MOSI / MISO / SCLK / NSS | SPI interface signals | Full-duplex isolated SPI for diagnostics, fault clearing, and channel enable/disable |
| FLT | Fault indicator | Active-low open-drain output asserting when any diagnostic fault is active |
| NC | No-connect | Unbonded pins - must be left floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| RF-based CMOS isolation | Eliminates LED degradation and lifetime drift of optocouplers; enables >100 kV/µs CMTI |
| Smart multi-voltage clamp | Handles unlimited demagnetization energy (EAS) while enabling fast inductor turn-OFF |
| SPI-configurable diagnostics | Eight distinct fault reports (overcurrent, overtemp, open-load, comm error) accessible via registers |
| Asynchronous fault clearing | FLT_CLR pin allows hardware-initiated reset of latched faults without MCU intervention |
| Supply monitoring | Independent UVLO on VDD1 and VDD2 prevents erratic behavior during brownout or power sequencing |
| IEC 61131-2 compliance | Meets industrial programmable controller input/output interface standards for robustness |
Applications
| Programmable Logic Controller (PLC) Output Module | Industrial Data Acquisition System |
|---|---|
Use Scenario: Driving 24 V DC solenoids and indicator lamps in modular PLC backplanes with space-constrained I/O slots. IC Role / Device Role / Timing Role: High-side switch providing isolated, current-limited, fault-monitored load control per channel. Use Value: Replaces discrete optocoupler + MOSFET + protection circuits with single-chip solution reducing BOM count by 60% and improving MTBF. | Use Scenario: Conditioning and isolating sensor actuation signals in distributed I/O nodes connected to central controllers via RS-485 or EtherCAT. IC Role / Device Role / Timing Role: Galvanically isolated high-side driver enabling safe 24 V field-side switching with real-time diagnostics. Use Value: Enables predictive maintenance via SPI-read open-circuit and overtemperature warnings before field device failure. |
| 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 and fast response are critical. IC Role / Device Role / Timing Role: Isolated high-side switch delivering 10 µs update rate and >100 kV/µs transient immunity. Use Value: Prevents spurious tripping during motor commutation transients, eliminating need for external snubbers. | Use Scenario: Upgrading legacy electromechanical relays in HVAC control panels to solid-state with built-in health monitoring. IC Role / Device Role / Timing Role: Four-channel smart switch replacing mechanical contacts with electronic switching and diagnostics. Use Value: Extends service life beyond 10M cycles and provides early warning of coil degradation via open-circuit detection. |
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 |
|---|---|---|---|
| SI83404BAA-IF | Parallel interface only; no SPI; includes OE pin and LED indicators | Lacks diagnostic access - suitable only for simple on/off control without monitoring | Select when diagnostics are unnecessary and board space permits larger control logic footprint |
| SI83408ADA-IF | Same pinout and SPI interface, but adds Inrush Current Mode (8 A/20 ms) | Enables lamp load pre-heat without external current limiting; higher peak stress on internal clamp | Choose for lighting control or incandescent lamp driving where inrush management is required |
Compared with SI83408BDA-IFR, SI83404BAA-IF sacrifices diagnostics for simpler control, while SI83408ADA-IF extends functionality with inrush mode at identical packaging and pinout - making it a drop-in upgrade if lamp loads are present.
Availability
SI83408BDA-IFR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data acquisition systems, and motion controllers requiring stable component supply across long production lifecycles.
Supply support for SI83408BDA-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 delivers isolated smart switches designed specifically for industrial control systems - integrating high-voltage isolation, load protection, and digital diagnostics into single-package solutions for PLC and I/O module designers.
FAQ
What is the maximum continuous current rating per channel for the SI83408BDA-IFR?
The SI83408BDA-IFR supports 0.7 A continuous current per channel at an RON of 155 mΩ, validated under 125 °C ambient and 32 V VDD2 conditions. This rating assumes proper PCB copper area for thermal dissipation and accounts for derating due to ambient temperature and adjacent channel loading. The SI83408BDA-IFR does not include inrush current mode, distinguishing it from variants like SI83408ADA-IF.
Does the SI83408BDA-IFR support both high-side and low-side switching configurations?
The SI83408BDA-IFR is configured exclusively as a high-side sourcing switch - its B1–B4 outputs source current from VDD2 to the load. It does not support low-side sinking operation. Low-side alternatives in the Si834x family include SI83414xxx variants. Pinout, isolation architecture, and protection features are optimized for high-side use cases like PLC output stages.
How is fault information reported on the SI83408BDA-IFR?
Fault information on the SI83408BDA-IFR is reported exclusively via its isolated SPI interface - eight distinct diagnostic flags (e.g., overcurrent, overtemperature, open-circuit, communication error) are stored in status registers readable by the host MCU. The FLT pin provides a consolidated active-low open-drain signal indicating presence of any active fault, but individual fault identification requires SPI register reads.
What isolation certifications apply to the SI83408BDA-IFR?
The SI83408BDA-IFR carries pending safety certifications including UL 1577 recognition (1500 Vrms, 1 minute), CSA certification to 62368-1, and CQC approval to GB4943.1. Its 1.5 kVRMS isolation rating and >100 kV/µs CMTI meet requirements for reinforced insulation in industrial equipment per IEC 61000-4-5 and IEC 61131-2.
Can the SI83408BDA-IFR be used with a 2.5 V microcontroller?
Yes, the SI83408BDA-IFR supports logic supply voltages from 2.25 V to 5.5 V, making it fully compatible with 2.5 V microcontrollers. Its SPI interface operates at the VDD1 voltage level, eliminating the need for level shifters. Input thresholds are designed for rail-to-rail compatibility, and the device maintains full functionality - including diagnostics and fault reporting - across the entire logic supply range.
SI83408BDA-IFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 32-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Magnetic 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)
SI83408BDA-IFR FAQ
1.How can I place an order for SI83408BDA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83408BDA-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 SI83408BDA-IFR reliable?
The price and inventory of SI83408BDA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83408BDA-IFR is usually 5 days.
3.What payment methods are accepted for SI83408BDA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83408BDA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83408BDA-IFR?
SI83408BDA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83408BDA-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 SI83408BDA-IFR?
For technical support, including SI83408BDA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83408BDA-IFR requirements.
6.How does Aetrix verify that SI83408BDA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83408BDA-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 SI83408BDA-IFR meets industry standards.
7.What is the process for return or replacement of SI83408BDA-IFR?
All SI83408BDA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83408BDA-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 SI83408BDA-IFR part is unused and in its original packaging.
Return procedure for SI83408BDA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83408BDA-IFR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
