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Skyworks Solutions Inc. SI8388P-IUR
- Part No.:
- SI8388P-IUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8388P-IUR.pdf
- Description:
- DGTL ISO 2500VRMS 8CH GP 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
SI8388P-IUR from Skyworks Solutions is an 8-channel bipolar digital field input isolator for industrial PLC and I/O module applications. It provides 24 V sinking/sourcing inputs with integrated 2.5 kVRMS CMOS isolation, no VDD required on the field side, and parallel output interface compliant to IEC 61131-2 Types 1–3.
For engineers reviewing the SI8388P-IUR datasheet, SI8388P-IUR pinout, SI8388P-IUR application, or SI8388P-IUR equivalent, this device serves as a high-reliability, opto-coupler-replacing solution for noise-immune 24 V digital input conditioning in safety-critical industrial control systems.
Technical Context
The SI8388P-IUR implements Skyworks' CMOS-based capacitive isolation with an LED emulator front end, enabling true bipolar (sinking or sourcing) 24 V input operation without field-side power. Each of its eight channels uses an OOK-modulated RF carrier across the isolation barrier.
Its parallel output architecture delivers flow-through signals on all eight Bx outputs with fixed low-pass debounce filtering (0 ms configurable delay per ordering guide), supporting up to 2 Mbps data rate and 300 kV/μs CMTI - all while maintaining –40°C to +125°C operation and UL/VDE/CSA safety certifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Channels | 8 independent bipolar digital inputs for 24 V industrial logic |
| Isolation Rating | 2.5 kVRMS withstand voltage per UL 1577 and VDE 0884-10 |
| Data Rate | Up to 2 Mbps - supports fast response in motion control and CNC feedback loops |
| Input Current | 1 mA typical - enables direct connection to 24 V sources with minimal external resistor network |
| Debounce Filter | Fixed low-pass filter (0 ms user-selectable delay) - reduces design complexity vs. SPI-configurable variants |
| Operating Voltage | VDD = 2.25–5.5 V - compatible with common MCU I/O rails and industrial 3.3 V/5 V supplies |
| Temperature Range | –40°C to +125°C - qualified for harsh factory-floor and embedded control environments |
Pinout & Package
SI8388P-IUR is housed in a RoHS-compliant QSOP-20 package (5.3 mm × 10.2 mm, 0.65 mm pitch) with reinforced creepage/clearance for industrial isolation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Field-side input anodes | Accept 24 V sinking or sourcing current; no VDD required on field side |
| COM (A19, A20) | Field-side common return | Shared reference for all eight input channels; supports bipolar configuration |
| B1–B8 | Logic-side output drivers | Flow-through parallel outputs; 2.25–5.5 V compatible, ~50 Ω impedance |
| VDD (Pin 15) | Logic-side supply | Powers output stage and internal circuitry; bypass with 0.1 µF capacitor |
| GND (Pin 16) | Logic-side ground | Reference for VDD and output logic levels; separate from field-side COM |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar 24 V input interface | Eliminates need for external polarity-selection circuitry or dual-input designs |
| No field-side VDD requirement | Reduces bill-of-materials and simplifies field wiring by powering isolation channel from input current |
| Integrated 2.5 kVRMS isolation | Meets IEC 61131-2 Type 1/2/3 and safety standards (UL, VDE, CSA) without external isolation components |
| High CMTI (300 kV/μs) | Prevents false triggering in electrically noisy industrial environments such as motor drives and VFDs |
| Parallel 8-output interface | Direct connection to MCU GPIO or FPGA inputs without protocol overhead or timing constraints |
Applications
| Programmable Logic Controllers (PLCs) | Industrial I/O Modules |
|---|---|
Use Scenario: Digital input acquisition from 24 V sensors and switches in modular rack-mounted PLC backplanes. IC Role / Device Role / Timing Role: Isolated field-to-controller signal conditioner with <1 µs propagation delay and built-in noise immunity. Use Value: Enables direct integration into DIN-rail I/O modules without optocoupler aging concerns or external filtering components. | Use Scenario: Compact, high-density remote I/O units deployed in distributed control systems (DCS). IC Role / Device Role / Timing Role: Eight-channel galvanic barrier between hazardous field wiring and safe logic-side microcontrollers. Use Value: Reduces PCB area and thermal load versus discrete optocoupler solutions while meeting IEC 61131-2 compliance out-of-box. |
| CNC Machine Control | Motion Control Systems |
Use Scenario: Real-time monitoring of limit switches, homing sensors, and emergency stop circuits in CNC tooling. IC Role / Device Role / Timing Role: High-speed, low-skew digital input isolator with deterministic response for safety-critical axis control. Use Value: Guarantees sub-microsecond timing consistency across all eight channels - critical for synchronized multi-axis coordination. | Use Scenario: Feedback signal conditioning for servo drives and stepper controllers in automated assembly lines. IC Role / Device Role / Timing Role: Robust isolated interface for encoder zero-mark detection, brake status, and fault signaling. Use Value: Delivers 300 kV/μs transient immunity to suppress EMI from nearby motor switching events. |
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 |
|---|---|---|---|
| SI8388P-IU | Same pinout, identical electrical specs, but supplied in tape-and-reel (no "R" suffix); SI8388P-IUR includes reel packaging | No functional difference; both support same IEC 61131-2 compliance and 0 ms debounce filter | Select SI8388P-IUR for automated SMT assembly; SI8388P-IU for manual prototyping or low-volume use |
| SI8384P-IU | 4-channel version in same QSOP-20 package; shares identical isolation, voltage, and timing specs | Suitable where only four inputs are needed per node - reduces channel density but maintains per-channel performance | Choose when board space allows channel splitting or system scalability requires modular input expansion |
Compared with SI8388P-IU, SI8388P-IUR offers identical functionality with optimized packaging for production; versus SI8384P-IU, it doubles channel count without increasing footprint - enabling higher I/O density in space-constrained PLC base units.
Availability
SI8388P-IUR is available at Aetrix Electronics and suitable for programmable logic controllers, industrial I/O modules, and motion control systems requiring stable component supply, long-term lifecycle assurance, and certified safety isolation.
Supply support for SI8388P-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 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 primary function of the SI8388P-IUR in an industrial control system?
The SI8388P-IUR serves as an 8-channel isolated digital input interface that conditions 24 V field signals (sinking or sourcing) for safe, noise-immune connection to microcontrollers or FPGAs in PLCs and I/O modules. Its integrated 2.5 kVRMS CMOS isolation eliminates the need for external optocouplers, and the SI8388P-IUR operates without field-side power - making it ideal for rugged industrial environments where reliability and certification compliance are critical.
Does the SI8388P-IUR require a power supply on the field side?
No, the SI8388P-IUR does not require a power supply on the field side. Its bipolar LED emulator input draws operating current directly from the 24 V field signal - typically just 1 mA - to power the isolation channel's RF modulator. This feature simplifies wiring, reduces component count, and enhances system robustness, and the SI8388P-IUR maintains full functionality with no external VDD on the input side.
How does the SI8388P-IUR achieve IEC 61131-2 compliance?
The SI8388P-IUR achieves IEC 61131-2 compliance through its configurable input threshold behavior and integrated low-pass debounce filtering. When used with recommended external resistor networks, it meets the voltage/current thresholds and response time requirements for Switch Types 1, 2, and 3. The SI8388P-IUR's fixed 0 ms debounce option (per Ordering Guide) supports high-speed applications, and its certified 2.5 kVRMS isolation satisfies the standard's insulation requirements.
What is the maximum data rate supported by the SI8388P-IUR?
The SI8388P-IUR supports a maximum data rate of 2 Mbps across all eight channels. This high-speed capability ensures minimal propagation delay (<1 µs typical) and tight channel-to-channel skew - essential for time-critical applications like CNC machine homing or real-time motion control. The SI8388P-IUR sustains this rate under full temperature range (–40°C to +125°C) and with guaranteed CMTI of 300 kV/μs.
Can the SI8388P-IUR be used in place of optocouplers in legacy designs?
Yes, the SI8388P-IUR is engineered as a direct, drop-in replacement for 8-channel optocoupler-based input stages. It matches the QSOP-20 footprint and pinout of common optocoupler arrays, provides superior lifetime reliability (no LED degradation), and eliminates aging-related parameter drift. Because the SI8388P-IUR requires no field-side VDD and delivers higher noise immunity, it often simplifies redesigns - and the SI8388P-IUR maintains full compatibility with existing 24 V sensor interfaces and PLC backplane layouts.
SI8388P-IUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SI8388P-IUR FAQ
1.How can I place an order for SI8388P-IUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8388P-IUR 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 SI8388P-IUR reliable?
The price and inventory of SI8388P-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8388P-IUR is usually 5 days.
3.What payment methods are accepted for SI8388P-IUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8388P-IUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8388P-IUR?
SI8388P-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8388P-IUR 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 SI8388P-IUR?
For technical support, including SI8388P-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8388P-IUR requirements.
6.How does Aetrix verify that SI8388P-IUR is sourced from the original manufacturer or authorized distributors?
All SI8388P-IUR 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 SI8388P-IUR meets industry standards.
7.What is the process for return or replacement of SI8388P-IUR?
All SI8388P-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8388P-IUR, 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 SI8388P-IUR part is unused and in its original packaging.
Return procedure for SI8388P-IUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8388P-IUR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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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
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