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Skyworks Solutions Inc. SI83412BCA-IFR
- Part No.:
- SI83412BCA-IFR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 32-VFDFN Exposed Pad
- Datasheet:
-
SI83412BCA-IFR.pdf
- Description:
- 2 CH, ISOLATED SMART SWITCH, SOU
- Quantity:
- Payment:
- Shipping:
Inventory:1,537
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Product details
Overview
SI83412BCA-IFR from Skyworks Solutions is a 2-channel isolated smart switch configured as low-side, open-drain drivers with galvanic isolation, 1.25 A continuous current per channel (78 mΩ RON), 9–32 V switch supply, and 2.25–5.5 V logic supply - designed for industrial PLC output modules driving solenoids and relays.
For engineers reviewing the SI83412BCA-IFR datasheet, SI83412BCA-IFR pinout, SI83412BCA-IFR application, or SI83412BCA-IFR equivalent, this page delivers verified specifications, fault diagnostics architecture, isolation barrier behavior, and real-world load interface constraints - all confirmed against Skyworks' official Si834x datasheet (206512A, March 2023).
Technical Context
The SI83412BCA-IFR implements two independent low-side switches using RF-based CMOS isolation, each with dedicated voltage/current/temperature sensing, multi-voltage smart clamp for unlimited EAS handling, and asynchronous OE control. Its analog power domain (VDD2) operates from 9–32 V, while digital logic (VDD1) supports 2.25–5.5 V MCUs.
Unlike SPI-only variants, SI83412BCA-IFR uses parallel input control with no SPI interface; diagnostics are exposed via dedicated indicator pins - specifically, an open-drain VDD2_WRN pin signaling undervoltage on the switch supply, and no FLT or LEDn pins per Table 1 (Ordering Guide). It belongs to the "BCA" suffix group indicating low-side, parallel-only, 2-channel configuration with VDD2_WRN support but no channel status LEDs or fault clear input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Low-side, open-drain switch - sinks current to GND2; requires external pull-up for load connection. |
| Channels | 2 independent channels - enables dual solenoid/relay control without shared current derating. |
| Continuous Current | 1.25 A per channel - sustained drive capability for industrial inductive loads at ambient ≤125°C. |
| RON | 78 mΩ max - minimizes conduction loss and self-heating under full load (e.g., <120 mW/channel at 1.25 A). |
| Switch Supply Range | 9 V–32 V - compatible with standard 24 V DC industrial bus rails and tolerant of brownouts down to 9 V. |
| Logic Supply Range | 2.25 V–5.5 V - interoperable with modern low-voltage MCUs (e.g., ARM Cortex-M0+) without level-shifting. |
| Isolation Rating | 1.5 kVRMS - certified UL 1577 (1 min), CSA 62368-1, CQC GB4943.1 - meets functional safety requirements for PLC I/O. |
| CMTI | >100 kV/µs - immune to fast transients common in motor drives and factory floor EMI environments. |
Pinout & Package
SI83412BCA-IFR is housed in a compact 9×9 mm DFN-32 package with wettable flanks, optimized for automated optical inspection (AOI) and high-density industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Logic supply input | Powers internal digital circuitry; must be 2.25–5.5 V; internal diode allows powering from logic inputs if source current suffices. |
| GND1 | Logic ground reference | Return path for VDD1 domain; must be separated from GND2 by ≥0.5 mm creepage/clearance per safety standards. |
| OE | Asynchronous output enable | Active-high; disables all outputs immediately when pulled low - used for emergency shutdown or system-level reset. |
| A1, A2 | Parallel input controls | Direct logic-level signals (2.25–5.5 V) controlling B1 and B2 outputs respectively; no internal pull-ups. |
| B1, B2 | Low-side switch outputs | Open-drain N-channel MOSFET drains - connect to load cathodes; require external pull-up to VDD2 or load supply. |
| VDD2 | Switch supply input | Provides power to output stage and clamp circuitry; range 9–32 V; monitored for undervoltage warning. |
| GND2 | Power ground reference | Return path for VDD2 and switch currents; electrically isolated from GND1 by 1.5 kVRMS barrier. |
| VDD2_WRN | Open-drain undervoltage indicator | Active-low signal asserted when VDD2 drops below VDD2UV9 threshold (~8.5 V); requires external pull-up to VDD2. |
| NC | No-connect | Pins marked NC (e.g., pins 21, 22, 29, 30) are internally unconnected - must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Galvanic RF isolation | CMOS-based barrier replaces optocouplers - eliminates LED aging, improves CMTI (>100 kV/µs), and enables 1.5 kVRMS safety rating. |
| Smart multi-voltage clamp | Handles unlimited demagnetization energy (EAS) during inductive turn-off - prevents voltage overshoot and contact arcing in relay/solenoid coils. |
| VDD2 undervoltage monitoring | Dedicated VDD2_WRN pin reports supply drop below ~8.5 V - enables early warning before output failure in 24 V systems with line sag. |
| Overcurrent & overtemperature protection | Per-channel current limiting and thermal shutdown - constrains output during overload without latch-up; recovers automatically after fault clears. |
| Industrial-grade operating range | –40°C to +125°C ambient - validated for use in cabinet-mounted PLC modules without forced air cooling. |
| IEC 61131-2 compliance | Meets Type 1/Type 3 input/output characteristics for programmable controllers - ensures interoperability with standard industrial fieldbus systems. |
Applications
| PLC Digital Output Module | Industrial Motion Controller I/O |
|---|---|
|
Use Scenario: Driving 24 V DC solenoid valves in modular PLC backplanes with space-constrained DIN-rail enclosures. IC Role / Device Role / Timing Role: Low-side switch providing isolated, current-limited, and fault-monitored load control - replaces discrete MOSFET + optocoupler + protection IC solutions. Use Value: Eliminates 7+ components per channel while delivering 1.25 A drive, 78 mΩ RON, and VDD2 undervoltage warning - reducing BOM cost and board area by >40%. |
Use Scenario: Controlling dual-axis stepper motor enable/disable lines and brake release circuits in CNC motion controllers. IC Role / Device Role / Timing Role: Galvanically isolated, fast-turning (tPLH/tPHL < 10 µs) low-side driver with built-in EAS clamp - manages inductive kickback from motor windings and brakes. Use Value: Prevents destructive voltage spikes during rapid brake engagement/disengagement - extends relay life and avoids MCU reset from supply rail disturbance. |
| Smart Solid-State Relay Board | Factory Automation Data Acquisition Node |
|
Use Scenario: Building compact, DIN-rail mountable SSRs for HVAC zone control and lighting systems requiring UL/CSA certification. IC Role / Device Role / Timing Role: Safety-rated (1.5 kVRMS) isolated switch with integrated diagnostics - serves as core output stage in Class I/II industrial relay replacements. Use Value: Achieves UL 1577 recognition and CSA 62368-1 compliance in a single DFN-32 package - cuts time-to-certification versus discrete designs. |
Use Scenario: Remote I/O nodes collecting sensor data and actuating local field devices (e.g., pneumatic actuators) in distributed control architectures. IC Role / Device Role / Timing Role: Isolated, fault-aware output driver interfacing with microcontroller over 2.5 V logic - handles 9–32 V field-side loads with robust transient immunity. Use Value: Withstands >100 kV/µs CMTI and –40°C to +125°C operation - maintains reliability in unconditioned factory environments with high EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-side isolated switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI83412BBA-IFR | No VDD2_WRN pin; no undervoltage warning indicator - only basic fault detection via FLT pin (not present on SI83412BCA-IFR). | Suitable where VDD2 stability is guaranteed and early undervoltage alert is unnecessary - reduces external monitoring complexity. | Select SI83412BBA-IFR only if system-level supervision already monitors VDD2; otherwise SI83412BCA-IFR provides critical early-warning capability. |
| SI83412BCA-IF | Same electrical specs and pinout, but supplied in cut-tape (non-reel) packaging - lacks embossed tape-and-reel marking and orientation coding. | Preferred for prototyping, low-volume production, or manual assembly where reel feeding is not required. | Choose SI83412BCA-IFR for automated SMT lines requiring tape-and-reel delivery; SI83412BCA-IF is functionally identical but unsuitable for pick-and-place. |
Compared with SI83412BBA-IFR, SI83412BCA-IFR adds VDD2_WRN for proactive power rail health monitoring - critical in field-deployed systems with long cable runs. Compared with SI83412BCA-IF, the -IFR variant ensures consistent machine placement via industry-standard tape-and-reel packaging with sprocket hole alignment and component orientation marking.
Availability
SI83412BCA-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-term lifecycle assurance, and traceable sourcing.
Supply support for SI83412BCA-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, with leadership in RF, isolation, timing, and power management technologies.
The Si834x family was engineered to replace optocoupler-based relay drivers in industrial automation - delivering higher reliability, faster switching, integrated diagnostics, and safety-certified isolation in compact DFN packages.
FAQ
What is the maximum continuous current per channel for SI83412BCA-IFR?
The SI83412BCA-IFR supports 1.25 A continuous current per channel at ambient temperatures up to +125°C, with a typical RON of 78 mΩ. This rating assumes proper PCB copper area for thermal dissipation and operation within the 9–32 V VDD2 supply range. Derating applies above 85°C ambient per the thermal characteristics in Section 4.2 of the datasheet.
Does SI83412BCA-IFR include SPI communication capability?
No, SI83412BCA-IFR does not support SPI. It belongs to the "BCA" ordering variant, which implements parallel input control only - A1/A2 pins directly drive B1/B2 outputs. Diagnostics are limited to the VDD2_WRN pin; no FLT, LEDn, or SPI pins are active on this part. For SPI-enabled diagnostics, consider SI83412BDA-IFR instead.
What isolation voltage rating does SI83412BCA-IFR have, and which safety standards does it meet?
SI83412BCA-IFR provides 1.5 kVRMS galvanic isolation across its barrier, certified to UL 1577 (1 minute), CSA 62368-1, and CQC GB4943.1. This rating covers functional isolation for industrial I/O applications and satisfies IEC 61131-2 Type 1/Type 3 requirements - enabling direct integration into certified PLC and motion control hardware.
How does the VDD2_WRN pin function on SI83412BCA-IFR?
The VDD2_WRN pin on SI83412BCA-IFR is an open-drain, active-low indicator that asserts when the switch supply (VDD2) falls below ~8.5 V (VDD2UV9 threshold). It requires an external pull-up resistor to VDD2 and provides early warning of brownout conditions before output failure - allowing host controllers to initiate graceful shutdown or alarm sequences.
Can SI83412BCA-IFR drive inductive loads like solenoids and relays safely?
Yes, SI83412BCA-IFR is explicitly designed for inductive loads. Its integrated multi-voltage smart clamp handles unlimited demagnetization energy (EAS), enabling fast, arc-free turn-off of solenoids and relays. Combined with overcurrent and overtemperature protection, it eliminates the need for external flyback diodes or snubbers in most 24 V industrial applications.
SI83412BCA-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):
- 3.7µs, 3.7µs
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -, 3µs
- 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)
SI83412BCA-IFR FAQ
1.How can I place an order for SI83412BCA-IFR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI83412BCA-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 SI83412BCA-IFR reliable?
The price and inventory of SI83412BCA-IFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI83412BCA-IFR is usually 5 days.
3.What payment methods are accepted for SI83412BCA-IFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI83412BCA-IFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI83412BCA-IFR?
SI83412BCA-IFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI83412BCA-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 SI83412BCA-IFR?
For technical support, including SI83412BCA-IFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI83412BCA-IFR requirements.
6.How does Aetrix verify that SI83412BCA-IFR is sourced from the original manufacturer or authorized distributors?
All SI83412BCA-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 SI83412BCA-IFR meets industry standards.
7.What is the process for return or replacement of SI83412BCA-IFR?
All SI83412BCA-IFR units undergo pre-shipment inspection (PSI). If there is an issue with SI83412BCA-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 SI83412BCA-IFR part is unused and in its original packaging.
Return procedure for SI83412BCA-IFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI83412BCA-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
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