Skyworks Solutions Inc. SI8384PF-IUR

Overview

SI8384PF-IUR 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 isolation, 10 ms low-pass debounce filtering per channel, and operates from 2.25–5.5 V VDD. Its CMOS-based LED emulator eliminates need for field-side VDD while enabling IEC 61131-2 Type 1/2/3 compliance.

For engineers reviewing the SI8384PF-IUR datasheet, SI8384PF-IUR pinout, SI8384PF-IUR application, or SI8384PF-IUR equivalent, key selection considerations include channel count, fixed 10 ms debounce delay, QSOP-20 package, 24 V bipolar interface capability, and absence of SPI configurability compared to serial variants.

Technical Context

The SI8384PF-IUR implements eight parallel-output, low-speed digital input channels using Skyworks' capacitive CMOS isolation barrier. Each channel features a bipolar LED emulator front end that accepts 24 V sinking or sourcing signals without field-side power, and routes inputs through a fixed 10 ms low-pass debounce filter before output.

This variant uses flow-through parallel outputs (B1–B8) with no serial interface-unlike the Si8380S-making it suitable for direct MCU GPIO connection. Its isolation architecture delivers 300 kV/μs CMTI, 2.5 kVRMS withstand voltage, and –40°C to +125°C operation, targeting high-noise industrial environments requiring robust signal conditioning.

Key Specifications

Pinout & Package

SI8384PF-IUR 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 standard JEDEC QSOP layout with pins 1–10 on top row (left to right), 11–20 on bottom row (right to left).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital field input isolator applications.

Compared with SI8384P-IUR, SI8384PF-IUR trades 1.2 μs higher propagation delay for integrated 10 ms noise suppression-reducing firmware debounce load. Against SI8384PM-IUR, it offers tighter timing control for applications where 30 ms would introduce unacceptable scan cycle lag.

Availability

SI8384PF-IUR 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 isolation performance.

Supply support for SI8384PF-IUR 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 communications, industrial, and automotive markets.

The Si838x product line was designed specifically to replace optocoupler-based digital inputs in industrial automation, delivering higher reliability, longer service life, and simplified IEC 61131-2 compliance through integrated bipolar isolation.

FAQ

What is the debounce filter configuration of SI8384PF-IUR?

The SI8384PF-IUR features a fixed 10 ms low-pass debounce filter on all eight input channels, as defined in the ordering guide. This filter is implemented in hardware and cannot be modified via software or external components. It provides consistent noise suppression for mechanical switch inputs without requiring MCU firmware intervention, making SI8384PF-IUR ideal for deterministic real-time I/O applications where timing predictability is essential.

Does SI8384PF-IUR require a power supply on the field side?

No, SI8384PF-IUR does not require any power supply on the field side. Its bipolar LED emulator input circuit derives operating energy directly from the 24 V input current-typically 1 mA minimum-eliminating the need for isolated DC-DC converters or auxiliary supplies. This enables true 2-wire field connections and simplifies wiring in PLC backplanes and remote I/O terminals where space and cost constraints prohibit additional power rails.

What safety certifications apply to SI8384PF-IUR?

SI8384PF-IUR is certified to UL 1577 (2500 VRMS, 1 minute), VDE 0884-10, CSA Component Notice 5A, IEC 60950-1, IEC 62368-1, and GB4943.1. These approvals validate its 2.5 kVRMS isolation barrier for reinforced insulation in industrial equipment. The device meets creepage and clearance requirements per IEC 61000-4-5 and supports system-level compliance with functional safety standards when used per Skyworks' recommended layout and external component guidelines.

Can SI8384PF-IUR be used with 5 V microcontrollers?

Yes, SI8384PF-IUR supports logic-side VDD from 2.25 V to 5.5 V, making it fully compatible with both 3.3 V and 5 V microcontrollers. Its B1–B8 outputs are CMOS-compatible with rail-to-rail swing and 50 Ω nominal output impedance, allowing direct connection to standard GPIO pins without level shifters. For 5 V operation, ensure the 0.1 µF VDD bypass capacitor is placed adjacent to Pin 15 and that GND (Pin 16) is properly decoupled.

How does SI8384PF-IUR differ from SI8380S-IU?

SI8384PF-IUR is a parallel-output device with fixed 10 ms debounce and no serial interface, whereas SI8380S-IU provides SPI-configurable per-channel filtering and daisy-chain capability. SI8384PF-IUR offers simpler integration with legacy PLC CPUs lacking SPI peripherals, while SI8380S-IU enables dynamic filter tuning and high-channel-count scalability (up to 128 channels). They share the same QSOP-20 package and 2.5 kVRMS isolation but are not pin-compatible due to differing pin functions (e.g., MOSI/SCLK on SI8380S vs. dedicated Bx outputs on SI8384PF-IUR).