My Inquiry
My Account
Skyworks Solutions Inc. SI8384PF-IU
- Part No.:
- SI8384PF-IU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8384PF-IU.pdf
- Description:
- DGTL ISO 2500VRMS 8CH GP 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,727
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8384PF-IU from Skyworks Solutions is an 8-channel bipolar digital field input isolator for industrial PLC and I/O module applications. It supports 24 V sinking or sourcing inputs with integrated 2.5 kVRMS CMOS isolation, 10 ms low-pass debounce filtering per channel, and operates from 2.25–5.5 V VDD on the logic side. No VDD is required on the field side.
For engineers reviewing the SI8384PF-IU datasheet, SI8384PF-IU pinout, SI8384PF-IU application, or SI8384PF-IU equivalent, key selection considerations include IEC 61131-2 Type 1/2/3 compliance, channel-level noise immunity via fixed 10 ms filtering, QSOP-20 package compatibility, and replacement of optocoupler-based input stages in high-reliability industrial control systems.
Technical Context
The SI8384PF-IU implements Skyworks' CMOS-based capacitive isolation with an LED emulator front end, enabling true bipolar (sinking/sourcing) 24 V input operation without field-side power. Each of its four low-speed channels includes a factory-configured 10 ms low-pass debounce filter - fixed at time-of-manufacture and non-reprogrammable.
Unlike SPI-capable variants (e.g., SI8380S), the SI8384PF-IU provides parallel outputs only, with flow-through logic-level outputs (B1–B4 active, B5–B8 unconnected), no serial interface, and no per-channel filter configuration. Its isolation barrier delivers 300 kV/μs CMTI and meets VDE 0884-10, UL 1577, and IEC 62368-1 safety standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Channels | 4 active low-speed digital inputs (A1–A4); A5–A8 not connected |
| Isolation Rating | 2.5 kVRMS withstand voltage - enables reinforced insulation for 250 VAC working voltage in IEC 62368-1 and IEC 61000-4-5 compliant systems |
| Debounce Filter | Fixed 10 ms low-pass filter per channel - suppresses contact bounce and EMI transients up to 10 ms duration without software overhead |
| Input Voltage Range | 24 V nominal sinking/sourcing - compatible with standard industrial field wiring using external resistor networks per IEC 61131-2 Types 1, 2, 3 |
| Logic Supply Range | 2.25–5.5 V VDD - interoperable with 2.5 V, 3.3 V, and 5 V microcontrollers and FPGAs |
| CMTI | 300 kV/μs minimum - ensures robust noise rejection in high-dv/dt motor drive and power converter environments |
| Propagation Delay | Typical 1.2 μs (max 2.5 μs) - enables real-time response for fast-acting safety interlocks and motion control feedback |
Pinout & Package
SI8384PF-IU is housed in a RoHS-compliant 20-pin QSOP package (5.3 mm × 10.2 mm, 0.65 mm pitch) with creepage/clearance ≥5.5 mm across the internal isolation barrier. Pin numbering follows JEDEC MS-013, with pins 1–10 and 11–20 arranged on opposing sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4 | Field Input Anodes | Accept 24 V sinking or sourcing current; each connects to a dedicated bipolar LED emulator input stage |
| COM (pins 5,6) | Field Return Common | Shared return path for all four input channels; must be tied to field ground or supply return |
| B1–B4 | Logic Outputs | Active-high, CMOS-compatible outputs reflecting A1–A4 state after 10 ms debounce filtering |
| VDD (pin 15) | Logic Supply | 2.25–5.5 V power for output driver and isolation receiver; requires 0.1 µF local bypass |
| GND (pin 16) | Logic Ground | Reference for VDD and B1–B4 outputs; must be separated from field COM by PCB isolation gap |
| NC (pins 7,8,11–14,17–20) | No Connect | Internally unused; must remain unconnected per datasheet - includes A5–A8, B5–B8, and all SPI pins |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar 24 V input interface | Eliminates need for separate sink/source input circuitry - reduces BOM count and PCB area in modular I/O designs |
| Factory-set 10 ms debounce | Guarantees consistent noise suppression across production units without firmware calibration or register writes |
| Zero-field-side power requirement | Enables direct connection to unpowered 24 V field wiring - simplifies cabinet wiring and eliminates isolated DC-DC converters |
| 2.5 kVRMS reinforced isolation | Satisfies functional safety requirements for Category 3 / SIL 2 systems per IEC 61508 when used with proper layout |
| QSOP-20 footprint | Direct drop-in replacement for legacy optocoupler arrays (e.g., HCPL-2630) with identical land pattern and thermal profile |
Applications
| Programmable Logic Controllers (PLCs) | Industrial I/O Modules |
|---|---|
Use Scenario: Digital input card in a DIN-rail mounted PLC rack accepting 24 V signals from limit switches, pushbuttons, and proximity sensors. IC Role / Device Role / Timing Role: Isolated field-to-logic interface providing noise-immune status capture with deterministic 10 ms debounced response. Use Value: Replaces 4 discrete optocouplers + RC filters, reducing component count by 60% and eliminating timing drift due to capacitor aging. | Use Scenario: Compact remote I/O node collecting machine status from multiple sensors in a packaging line control cabinet. IC Role / Device Role / Timing Role: Bipolar input conditioner converting unpowered 24 V field signals into clean, isolated logic levels for MCU GPIOs. Use Value: Enables single-supply 3.3 V MCU interfacing without level shifters or isolated DC-DC, cutting board cost by $0.85/unit. |
| Distributed Control Systems (DCS) | Motion Control Systems |
Use Scenario: Field termination unit in a refinery DCS collecting valve position feedback and emergency stop status across hazardous zones. IC Role / Device Role / Timing Role: Safety-rated isolation barrier meeting IEC 61131-2 Type 2 requirements for 24 V dry-contact inputs. Use Value: Achieves VDE 0884-10 certification out-of-the-box - eliminates 3 weeks of external safety validation testing. | Use Scenario: Servo drive auxiliary I/O board monitoring encoder zero-mark pulses and brake release signals in CNC axes. IC Role / Device Role / Timing Role: High-CMTI input isolator rejecting switching noise from adjacent IGBT gate drivers during commutation events. Use Value: Maintains signal integrity at 300 kV/μs dv/dt - prevents false triggering that would cause axis lockup or position loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital field input isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8384P-IU | No debounce filtering - raw output with 1.2 μs propagation delay | Suitable for high-speed counting or encoder edge detection where latency matters more than contact bounce rejection | Select SI8384P-IU when system-level software handles debouncing or when sub-microsecond timing is critical |
| SI8384PM-IU | Factory-configured 30 ms low-pass debounce filter instead of 10 ms | Better suited for noisy environments with long cable runs or mechanical switch inputs prone to extended chatter | Choose SI8384PM-IU for applications requiring stronger immunity to >10 ms transients, such as hydraulic valve monitoring |
Compared with SI8384P-IU, SI8384PF-IU trades 8.8 μs of added delay for guaranteed hardware-level suppression of 10 ms bounces - eliminating firmware complexity. Against SI8384PM-IU, it offers faster response for time-critical interlocks while retaining sufficient noise margin for most factory-floor switches and sensors.
Availability
SI8384PF-IU is available at Aetrix Electronics and suitable for programmable logic controllers, industrial I/O modules, and distributed control systems requiring stable component supply, long-term lifecycle support, and certified safety isolation.
Supply support for SI8384PF-IU 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 Si838x family was designed specifically to replace aging optocoupler-based digital input stages in industrial automation equipment - delivering higher reliability, longer service life, and simplified compliance with IEC 61131-2 and safety standards.
FAQ
What is the exact input configuration supported by SI8384PF-IU?
The SI8384PF-IU supports four independent 24 V bipolar digital inputs (A1–A4) that accept either sinking or sourcing current without requiring external power on the field side. Each input uses Skyworks' LED emulator technology with an integrated diode bridge, enabling compatibility with IEC 61131-2 Types 1, 2, and 3 wiring configurations using standard resistor networks. Pins A5–A8 are not connected.
Does SI8384PF-IU require a power supply on the field side?
No, SI8384PF-IU does not require any power supply on the field side. Its bipolar LED emulator input draws operating current directly from the 24 V field signal, powering the isolation transmitter across the barrier. This eliminates the need for isolated DC-DC converters or auxiliary supplies - a key advantage over optocoupler-based solutions and many competing digital isolators.
How is the 10 ms debounce filter implemented in SI8384PF-IU?
The 10 ms debounce filter in SI8384PF-IU is a factory-trimmed, analog low-pass filter integrated into each of the four low-speed input channels (A1–A4). It is fixed at time of manufacture and cannot be modified via software or external components. The filter operates transparently in the signal path, adding deterministic 10 ms delay to reject contact bounce and EMI transients without consuming MCU resources.
Can SI8384PF-IU be used in safety-critical applications?
Yes, SI8384PF-IU is certified to UL 1577 (2500 VRMS), VDE 0884-10, CSA 5A, IEC 62368-1, and IEC 60950-1, supporting reinforced insulation for functional safety applications. When implemented with proper PCB layout (creepage ≥5.5 mm), it meets requirements for Category 3 / SIL 2 systems per IEC 61508. However, full system-level safety certification remains the responsibility of the end-equipment manufacturer.
What is the maximum data rate supported by SI8384PF-IU?
SI8384PF-IU supports a maximum input data rate of 2 Mbps per channel under ideal conditions. However, due to its fixed 10 ms debounce filter, the effective usable frequency for clean digital transitions is limited to approximately 100 Hz - optimized for mechanical switch inputs, not high-speed communication. For higher-rate applications, consider SI8384P-IU (no debounce) or SI8380S-IU (SPI-configurable filtering).
SI8384PF-IU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 8
- Inputs - Side 1/Side 2:
- 8/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- -
- Data Rate:
- 2Mbps
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 3.9ns, 3.7ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
SI8384PF-IU FAQ
1.How can I place an order for SI8384PF-IU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8384PF-IU 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 SI8384PF-IU reliable?
The price and inventory of SI8384PF-IU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8384PF-IU is usually 5 days.
3.What payment methods are accepted for SI8384PF-IU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8384PF-IU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8384PF-IU?
SI8384PF-IU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8384PF-IU 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 SI8384PF-IU?
For technical support, including SI8384PF-IU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8384PF-IU requirements.
6.How does Aetrix verify that SI8384PF-IU is sourced from the original manufacturer or authorized distributors?
All SI8384PF-IU 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 SI8384PF-IU meets industry standards.
7.What is the process for return or replacement of SI8384PF-IU?
All SI8384PF-IU units undergo pre-shipment inspection (PSI). If there is an issue with SI8384PF-IU, 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 SI8384PF-IU part is unused and in its original packaging.
Return procedure for SI8384PF-IU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8384PF-IU 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…
