Skyworks Solutions Inc. SI8384PS-IUR

Overview

SI8384PS-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 CMOS isolation, no VDD required on the field side, 100 ms configurable debounce filtering, and 2.25–5.5 V logic-side supply. It complies with IEC 61131-2 Types 1/2/3 and safety standards including UL 1577 and VDE 0884-10.

For engineers reviewing the SI8384PS-IUR datasheet, SI8384PS-IUR pinout, SI8384PS-IUR application, or SI8384PS-IUR equivalent, key selection considerations include bipolar 24 V interface capability, field-side power-free operation, per-channel debounce configurability (in serial variants), QSOP-20 package compatibility, and IEC 61131-2 switch type compliance for industrial control systems.

Technical Context

The SI8384PS-IUR 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. Its eight parallel outputs are flow-through, with all four low-speed channels configured for fixed 100 ms low-pass debounce filtering per ordering guide Table 1.1.

Unlike serial variants (e.g., SI8380S), SI8384PS-IUR lacks SPI interface and per-channel filter programming - debounce behavior is factory-set and identical across all enabled low-speed channels. The device operates across –40 °C to +125 °C and delivers CMTI ≥300 kV/μs with propagation delay <1.5 μs (typ) for high-speed paths and added filter delay for low-speed paths.

Key Specifications

Pinout & Package

SI8384PS-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 functions are validated per Skyworks Si838x datasheet Rev. 1.0 Section 6.1 and Figure 6.1 (Si8384P pin diagram).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8384PF-IU (10 ms) and SI8384PM-IU (30 ms), SI8384PS-IUR provides the longest factory-set debounce (100 ms), making it optimal for highly noisy, slow-switching applications like emergency stop circuits and large relay feedback - at the expense of maximum channel update rate.

Availability

SI8384PS-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 safety isolation.

Supply support for SI8384PS-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, with leadership in RF, isolation, and timing technologies.

The Si838x product line was designed specifically for robust, safety-certified digital input conditioning in industrial automation - replacing aging optocoupler-based designs with higher reliability, tighter parametric matching, and extended temperature operation.

FAQ

What is the primary function of the SI8384PS-IUR in an industrial control system?

The SI8384PS-IUR serves as a safety-isolated, 4-channel digital input conditioner that converts 24 V sinking or sourcing field signals (e.g., from switches or sensors) into clean, 100 ms debounced logic-level outputs for microcontrollers or FPGAs. It eliminates the need for external power on the field side and meets IEC 61131-2 Type 3 requirements - a core function in PLC and I/O module designs where reliability and noise immunity are critical. SI8384PS-IUR achieves this using Skyworks' proprietary CMOS capacitive isolation technology.

Does the SI8384PS-IUR require a power supply on the field side?

No, the SI8384PS-IUR does not require any power supply on the field side. Its bipolar LED emulator input architecture draws operating current directly from the 24 V field signal via external current-limiting resistors - enabling fully isolated, two-wire field connections. This is confirmed in the Si838x datasheet Section 3.3 and System Overview, and is a defining feature of the SI8384PS-IUR versus optocoupler alternatives. Power is only needed on the logic side (VDD pin 19).

What debounce filtering is implemented in the SI8384PS-IUR, and is it configurable?

The SI8384PS-IUR implements a fixed 100 ms low-pass debounce filter on all four low-speed channels, as specified in Table 1.1 of the Si838x Ordering Guide. This filter is factory-configured and non-programmable - unlike the SPI-enabled SI8380S variant, SI8384PS-IUR has no serial interface or register access. The 100 ms setting is optimized for mechanical contact suppression in safety-critical applications such as emergency stops. SI8384PS-IUR's debounce behavior is deterministic and requires no host firmware interaction.

Which safety certifications apply to the SI8384PS-IUR?

The SI8384PS-IUR is certified to UL 1577 (2500 VRMS, 1 min), CSA Component Acceptance Notice 5A, VDE 0884-10, IEC 60950-1, IEC 62368-1, CQC, and GB4943.1 - all documented in the Si838x datasheet Section 1. These approvals validate its reinforced insulation barrier for use in industrial equipment requiring functional safety up to PL e (per ISO 13849) and SIL 3 (per IEC 61508). SI8384PS-IUR's isolation rating and test reports support end-system certification without additional barrier components.

Can the SI8384PS-IUR be used in place of an optocoupler-based input module?

Yes, the SI8384PS-IUR is a direct replacement for optocoupler-based digital input stages, offering superior performance: 300 kV/μs CMTI (vs. ~10–50 kV/μs for optos), no LED aging or parameter drift, –40 °C to +125 °C operation, and guaranteed 2.5 kVRMS isolation lifetime. Its pin-compatible QSOP-20 footprint and identical 24 V interface simplify drop-in upgrades. SI8384PS-IUR also eliminates field-side power routing and reduces system-level calibration effort - verified in Skyworks application notes AN1112 and AN1115.