Skyworks Solutions Inc. SI8380PF-IUR

Overview

SI8380PF-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 built-in 10 ms low-pass debounce filtering. It complies with IEC 61131-2 Types 1–3 and operates from –40 to +125 °C in QSOP-20 package.

For engineers reviewing the SI8380PF-IUR datasheet, SI8380PF-IUR pinout, SI8380PF-IUR application, or SI8380PF-IUR equivalent, key selection considerations include bipolar 24 V interface capability, factory-configured 10 ms debounce, safety-rated isolation rating, flow-through parallel output architecture, and compatibility with industrial noise-immune digital input designs.

Technical Context

The SI8380PF-IUR implements Skyworks' CMOS-based capacitive isolation with an LED emulator front end, enabling true bipolar (sinking/sourcing) operation without field-side power. Each of its eight input channels drives an OOK modulator across the isolation barrier, with outputs routed directly to eight buffered parallel pins (B1–B8).

It uses a fixed low-pass debounce filter (10 ms delay) applied to all eight channels - a factory-set configuration confirmed in Table 1.1 of the datasheet. Unlike SPI variants (e.g., SI8380S), it lacks register access or per-channel filter configurability, delivering deterministic timing and simplified system integration for high-noise industrial environments.

Key Specifications

Pinout & Package

SI8380PF-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 orientation with Pin 1 marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8380P-IUR, SI8380PF-IUR trades 1.2 µs lower propagation delay for guaranteed 10 ms hardware debounce - simplifying firmware and improving reliability in typical industrial switch inputs. Versus SI8380PM-IUR, it offers faster response while retaining robust noise rejection for most PLC digital input use cases.

Availability

SI8380PF-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 SI8380PF-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 family was designed specifically to replace aging optocoupler-based digital inputs in industrial automation, delivering higher reliability, longer service life, and integrated safety isolation without field-side power.

FAQ

What is the debounce filter configuration of SI8380PF-IUR?

The SI8380PF-IUR features a factory-configured 10 ms low-pass debounce filter applied to all eight input channels. This fixed delay is implemented in hardware and cannot be modified via software or external components. It is optimized for suppressing mechanical contact bounce and electromagnetic interference in standard 24 V industrial switch inputs, eliminating the need for external RC networks or firmware-based debouncing routines. The SI8380PF-IUR datasheet confirms this value in Table 1.1 under "Low-Pass Debounce Filter Delay".

Does SI8380PF-IUR require a power supply on the field side?

No, the SI8380PF-IUR does not require any power supply (VDD) on the field side. Its bipolar LED emulator input architecture draws operating current directly from the 24 V input signal through internal diode bridges and emulators, enabling fully passive field-side operation. This eliminates the need for isolated DC-DC converters or auxiliary supplies in the field wiring section - a key advantage over optocouplers and many competing isolators. Power is only required on the logic side (Pin 15, VDD = 2.25–5.5 V).

What safety certifications apply to SI8380PF-IUR?

The SI8380PF-IUR carries UL 1577 recognition (2500 VRMS for one minute), CSA Component Acceptance Notice 5A approval, VDE 0884-10 certification, CQC approval, and compliance with IEC 60950-1 and IEC 62368-1. These certifications validate its reinforced insulation barrier for use in industrial equipment requiring functional safety up to SIL2. All ratings are measured across the internal capacitive isolation barrier and documented in the official Si838x datasheet Section 5.5 and Section 5.7.

Can SI8380PF-IUR be used in place of SI8380P-IUR without board changes?

Yes, the SI8380PF-IUR is pin-compatible with the SI8380P-IUR - both use identical 20-QSOP packaging, identical pinout, and share the same VDD, GND, COM, A1–A8, and B1–B8 assignments. The only difference is the presence of the factory-programmed 10 ms debounce filter in SI8380PF-IUR, which requires no PCB modifications. No layout changes, component replacements, or firmware updates are needed to upgrade from SI8380P-IUR to SI8380PF-IUR for improved noise immunity.

What is the maximum data rate supported by SI8380PF-IUR?

The SI8380PF-IUR supports a maximum data rate of 2 Mbps per channel, as specified in the Si838x datasheet Key Features section. This corresponds to a minimum pulse width of 500 ns, enabling reliable capture of fast-switching industrial signals such as encoder index pulses or high-speed limit switch actuations. Propagation delay remains below 2.5 µs (typ. 1.2 µs), ensuring tight timing alignment across all eight channels - critical for synchronized multi-input event detection in motion control applications.