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S2S3
Sharp Microelectronics
OPTOISOLATOR 3.75KV TRIAC 4SMD
30956 Pcs New Original In Stock
Optoisolator Triac Output 3750Vrms 1 Channel 4-SMD
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5.0 / 5.0
- (358 Ratings)
S2S3
Product Overview
7927253
DiGi Electronics Part Number
S2S3-DGManufacturer
Sharp Microelectronics
S2S3
Description
OPTOISOLATOR 3.75KV TRIAC 4SMDInventory
30956 Pcs New Original In Stock
Optoisolator Triac Output 3750Vrms 1 Channel 4-SMD
Quantity
Minimum 1
Minimum 1
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S2S3 Technical Specifications
Category
Optoisolators, Triac, SCR Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Output Type
Triac
Zero Crossing Circuit
No
Number of Channels
1
Voltage - Isolation
3750Vrms
Voltage - Off State
600 V
Static dV/dt (Min)
100V/µs
Current - LED Trigger (Ift) (Max)
10mA
Current - On State (It (RMS)) (Max)
50 mA
Current - Hold (Ih)
3.5mA
Turn On Time
100µs (Max)
Voltage - Forward (Vf) (Typ)
1.2V
Current - DC Forward (If) (Max)
50 mA
Operating Temperature
-30°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
4-SMD
Supplier Device Package
4-SMD
Approval Agency
CSA, UR
Base Product Number
S2S
Datasheet & Documents
Datasheets
Download S2S3 Product Specification (PDF)
HTML Datasheet
S2S3-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Other Names
425-1297-5
Standard Package
50
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Je recommande vivement DiGi Electronics pour leur prix compétitifs et leur site ergonomique.
December 02, 2025
Die Zuverlässigkeit der Produkte bei DiGi Electronics ist hervorragend, und die Preise sind fair.
December 02, 2025
Their on-time shipments build trust and strengthen our business relationship.
December 02, 2025
Fast delivery and sturdy components have contributed significantly to the reliability of my electronic repairs.
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Frequently Asked Questions (FAQ)
What are the key reliability risks when using the S2S3 optoisolator in high-temperature industrial environments near its 100°C operating limit?
The S2S3 has a maximum operating temperature of 100°C, and prolonged exposure near this limit—especially in poorly ventilated enclosures—can accelerate LED degradation in the input side and reduce TRIAC switching lifetime. Unlike newer optoisolators with reinforced isolation or higher thermal derating margins, the S2S3 lacks built-in thermal shutdown or advanced packaging to mitigate heat buildup. Designers should implement conservative thermal management (e.g., copper pours, airflow) and consider derating the LED forward current below 50 mA to extend service life. Additionally, since the S2S3 is obsolete, long-term supply stability for replacement units in mission-critical systems is a significant risk.
Can the S2S3 safely replace a MOC3021 in a 240V AC motor control circuit, and what design changes are needed?
While both the S2S3 and MOC3021 are non-zero-crossing TRIAC-output optoisolators rated for 600V off-state voltage, direct replacement requires careful evaluation. The S2S3 has a lower static dV/dt rating (100 V/µs vs. 200 V/µs for MOC3021), making it more susceptible to false triggering in noisy AC lines without an external snubber. Also, the S2S3’s hold current (3.5 mA) is higher than the MOC3021’s (~1 mA), which may cause dropout issues with inductive loads like motors under light-load conditions. To safely substitute, add an RC snubber (e.g., 100Ω + 10nF) across the TRIAC and verify load compatibility. However, due to the S2S3’s obsolete status, sourcing genuine units long-term poses a supply-chain risk.
Why does the S2S3 lack a zero-crossing circuit, and how does this impact EMI and inrush current in AC switching applications?
The S2S3 omits a zero-crossing detector to reduce cost and complexity, but this forces the TRIAC to switch at any point in the AC waveform. This results in higher EMI due to rapid voltage transitions (dV/dt) and increased inrush current when switching capacitive or transformer loads—especially problematic in relay or solid-state relay (SSR) designs. Without zero-crossing, peak voltage switching can generate conducted emissions that may fail EMC standards. Designers must incorporate external filtering (e.g., common-mode chokes, X/Y capacitors) and consider soft-start techniques. For low-noise applications, migrating to a zero-crossing alternative like the LTV-817S-ZC (if footprint-compatible) is advisable, though the S2S3’s obsolescence limits future redesign flexibility.
Is the S2S3 suitable for 3-phase AC power monitoring systems requiring channel-to-channel isolation, and what are the integration challenges?
The S2S3 is a single-channel device, so implementing 3-phase monitoring would require three separate units. However, its 4-SMD package offers no creepage or clearance advantages over multi-channel alternatives, and board space becomes inefficient. More critically, mismatched propagation delays (up to 100 µs turn-on time) between individual S2S3 units can lead to inaccurate phase timing measurements. Additionally, since the S2S3 is RoHS non-compliant and obsolete, using it in new industrial designs risks non-compliance with modern environmental regulations and future repairability. For new designs, consider integrated multi-channel isolators like the ACPL-W346 or SI8711, which offer matched timing and better long-term support.
Given that the S2S3 is obsolete and RoHS non-compliant, what are the best drop-in replacement strategies for legacy maintenance without full PCB redesign?
For legacy systems where PCB layout cannot be changed, the Vishay VO2223A offers a compatible 4-SMD footprint, 600V off-state voltage, 3750Vrms isolation, and improved dV/dt (200 V/µs), with full RoHS compliance and active production status. It also includes a zero-crossing variant (VO2223B) if noise reduction is needed. Another option is the Lite-On LTV-356T, which matches the S2S3’s pinout and electrical characteristics while offering better long-term availability. Before substitution, validate trigger current compatibility (VO2223A requires only 5 mA max If) and ensure the replacement’s hold current (typically <2 mA) won’t cause unintended turn-off in low-current loads. Always test under worst-case line and load conditions to confirm reliability.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
S2S3 CAD Models
Sharp Microelectronics S2S3 PCB symbols & footprints
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