Skyworks Solutions Inc. SI8384P-IUR

Overview

SI8384P-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, and parallel output interface with four low-speed channels configured for 30 ms debounce filtering. It complies with IEC 61131-2 Type 1/2/3 switch standards.

For engineers reviewing the SI8384P-IUR datasheet, SI8384P-IUR pinout, SI8384P-IUR application, or SI8384P-IUR equivalent, key selection considerations include channel count (4 debounced), isolation rating (2.5 kVRMS), CMTI (300 kV/μs), operating voltage range (2.25–5.5 V), and QSOP-20 package compatibility with industrial control board layouts.

Technical Context

The SI8384P-IUR implements Skyworks' CMOS-based capacitive isolation with OOK modulation across an internal barrier, enabling bipolar (sinking/sourcing) 24 V input operation without field-side power. Each of its four low-speed input channels includes a fixed 30 ms low-pass debounce filter, while the remaining four channels are high-speed (no filter).

Its parallel output architecture delivers flow-through logic-level signals (Bx/BHx) directly to MCU or FPGA inputs, supporting up to 2 Mbps data rate. The device features undervoltage lockout (UVLO), built-in 4 µs low-pass filtering on all low-speed channels, and operates across –40 °C to +125 °C.

Key Specifications

Pinout & Package

SI8384P-IUR is housed in a RoHS-compliant 20-pin QSOP package (7.0 mm × 9.9 mm, 0.65 mm pitch) with reinforced creepage/clearance for industrial isolation requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8382P-IUR, SI8384P-IUR doubles channel density in the same footprint; compared with SI8384PF-IUR, it extends debounce duration for higher noise immunity in electrically harsh environments like motor control cabinets - enabling one hardware variant to serve both standard and safety-critical input roles.

Availability

SI8384P-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 SI8384P-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 developed specifically to replace aging optocoupler-based digital input stages in industrial automation equipment with higher-reliability, higher-performance CMOS isolation technology.

FAQ

What is the debounce behavior of the SI8384P-IUR, and how is it implemented?

The SI8384P-IUR provides fixed 30 ms low-pass debounce filtering on its four low-speed input channels (A1–A4). This is implemented entirely in hardware using an integrated RC-based filter stage, with an additional 4 µs inherent low-pass delay common to all low-speed channels. No configuration or SPI interface is required - the 30 ms value is set at manufacture and cannot be modified. This ensures deterministic, jitter-free filtering for mechanical switch inputs in safety-critical applications.

Does the SI8384P-IUR require a power supply on the field side?

No, the SI8384P-IUR does not require a field-side VDD. Its bipolar LED emulator input draws operating current directly from the 24 V field signal through an external resistor network, powering the isolation transmitter without auxiliary supply. This eliminates the need for isolated DC/DC converters or separate field-side regulators - simplifying design and reducing bill-of-materials cost.

How does the SI8384P-IUR differ from the SI8380S serial-output variant?

The SI8384P-IUR uses a parallel output interface with eight dedicated logic-level output pins (B1–B8), whereas the SI8380S uses a 4-wire SPI interface with daisy-chain capability. SI8384P-IUR offers simpler integration with MCUs lacking SPI peripherals or requiring minimal firmware overhead, while SI8380S enables per-channel configurable debounce and cascading of up to 128 channels. They share identical isolation, input, and temperature specifications.

What safety certifications apply to the SI8384P-IUR?

The SI8384P-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. These approvals validate its reinforced insulation barrier for use in industrial equipment requiring functional isolation and protection against electric shock in mains-connected systems.

Can the SI8384P-IUR be used with 12 V or 48 V field inputs?

Yes - the SI8384P-IUR's bipolar LED emulator input supports field voltages beyond 24 V. By adjusting the external series resistor network per Section 4.2 of the datasheet, it can be configured for 12 V (Type 1), 24 V (Type 2), or 48 V (Type 3) IEC 61131-2 compliance. Input current remains within specification (typ. 1 mA) across this range, preserving noise immunity and isolation integrity.