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NKK Switches S3A
- Part No.:
- S3A
- Manufacturer:
- NKK Switches
- Category:
- Toggle Switches
- Package:
- Datasheet:
-
S3A.pdf
- Description:
- SWITCH TOGGLE SPDT 15A 125V
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
S3A from Diodes Incorporated is a 3.0A, 50V glass passivated surface-mount rectifier diode in SMC package, featuring 1.15V forward voltage at 3.0A, 100A non-repetitive surge capability, and 10°C/W junction-to-terminal thermal resistance - used in AC/DC input stage rectification for industrial power supplies and LED drivers.
For engineers reviewing the S3A datasheet, S3A pinout, S3A application, or S3A equivalent, key selection criteria include peak reverse voltage (50V), average forward current (3.0A @ TT = +75°C), thermal resistance (10°C/W), surge rating (100A, 8.3ms), and RoHS-compliant matte tin plating.
Technical Context
The S3A operates as a single-phase, half-wave silicon rectifier with glass-passivated die construction ensuring stable reverse leakage (<10µA @ 25°C) and robust surge immunity. Its 50V VRRM and 3.0A IO rating target low-voltage, high-current secondary-side rectification where fast thermal response and low conduction loss are critical.
Designed for automated SMT assembly, it uses an SMC molded plastic case (UL 94V-0), cathode-band polarity marking, and lead-free matte tin terminals solderable per MIL-STD-202 Method 208. Moisture sensitivity is Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 24–48V DC bus applications. |
| IO | 3.0 A @ TT = +75°C - Continuous average forward current with standard PCB copper pad heatsinking (5.0 mm²). |
| VFM | 1.15 V @ IF = 3.0A - Forward drop directly impacts conduction loss and thermal rise in high-duty-cycle rectifiers. |
| IFSM | 100 A (8.3ms half-sine) - Withstands inrush surges from capacitive inputs or cold-start conditions without failure. |
| RθJT | 10 °C/W - Junction-to-terminal thermal resistance enables accurate temperature prediction using terminal temperature measurement. |
| IRM | 10 µA @ 25°C - Low reverse leakage preserves efficiency in standby and light-load operation. |
Pinout & Package
SMC package: molded plastic case, UL 94V-0 rated, cathode identified by band on top surface; terminals are matte tin-plated, lead-free, and solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point | Connected to AC source or transformer secondary; must withstand full surge current and reverse recovery stress. |
| Cathode | Output current exit point | Connected to output capacitor or load; marked by visible band; carries full average forward current and heat. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates need for silicone gel or conformal coating; improves long-term reliability under humidity and thermal cycling. |
| 100A surge rating (8.3ms) | Supports direct connection to unfiltered transformer secondaries without external fusing or NTC inrush limiters. |
| 10°C/W RθJT | Enables accurate thermal modeling using only terminal temperature measurement-no IR camera or embedded sensor required. |
| RoHS-compliant matte tin finish | Ensures compatibility with lead-free reflow profiles (peak 260°C) and eliminates post-solder cleaning requirements. |
Applications
| Industrial AC/DC Power Supplies | LED Driver Input Rectification |
|---|---|
Use Scenario: 24V/48V offline power supply with bridge or center-tap rectification feeding bulk capacitor. IC Role / Device Role / Timing Role: Primary rectifier converting AC line or transformer output to pulsating DC. Use Value: 1.15V VFM minimizes conduction loss at 3A load; 100A IFSM handles cold-start surges without derating. |
Use Scenario: Constant-current LED driver with transformer-isolated input stage operating at 35kHz switching frequency. IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter secondary side. Use Value: Low 40pF capacitance reduces switching node ringing; glass passivation ensures stability across wide ambient temperature range (-40°C to +85°C). |
| DC Motor Control Front-End | Telecom Power Shelf Rectification |
Use Scenario: Brushed DC motor controller with H-bridge and regenerative braking, requiring bidirectional energy handling. IC Role / Device Role / Timing Role: Freewheeling path during PWM off-time and reverse EMF clamping during braking. Use Value: 50V VRRM accommodates back-EMF spikes up to 40V; 3.0A IO supports continuous 2.5A motor current with margin. |
Use Scenario: -48V telecom power shelf with redundant AC inputs feeding distributed DC bus. IC Role / Device Role / Timing Role: Input-stage rectifier in dual-active-bridge or phase-shifted full-bridge front-end. Use Value: 10°C/W RθJT allows thermal monitoring via heatsink-mounted thermistor; RoHS/Green compliance meets NEBS Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR350 | Ultrafast recovery (trr = 50ns vs. S3A's ~200ns); higher VF (1.3V @ 3A); same SMC package. | Better suited for high-frequency SMPS (>100kHz); less optimal for line-frequency or low-switching applications due to higher conduction loss. | Select when EMI reduction or reduced switching loss outweighs conduction loss penalty. |
| Vishay VS-3EJH05-M3 | Same 50V VRRM, 3A IO, and SMC package; lower VF (1.05V @ 3A); tighter IRM spec (5µA max @ 25°C). | Offers marginally better efficiency and leakage performance; identical thermal and mechanical footprint. | Preferred for battery-backed or ultra-low-standby systems where leakage and conduction loss are co-critical. |
Compared with MUR350 and VS-3EJH05-M3, the S3A delivers optimal balance of surge robustness (100A), thermal predictability (10°C/W), and cost-effective glass-passivated reliability for line-frequency and medium-frequency rectification - without over-specifying speed or leakage where unnecessary.
Availability
S3A is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, LED driver input stages, and telecom power shelf rectification requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for S3A 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The S3A belongs to Diodes' S3x/B series of glass-passivated surface-mount rectifiers, engineered specifically for high-reliability, high-surge industrial and telecom power conversion where thermal stability and process consistency are essential.
FAQ
What is the maximum allowable junction temperature for the S3A?
The S3A has an operating junction temperature range of –65°C to +150°C per its datasheet. However, its rated average forward current (3.0A) is specified at terminal temperature TT = +75°C, and thermal design must ensure junction temperature remains ≤150°C under worst-case power dissipation and ambient conditions.
Can the S3A be used in a full-wave bridge configuration?
Yes - the S3A is a single diode and can be used as one leg of a discrete full-wave bridge. Four S3A devices may be assembled into a custom bridge rectifier, provided layout maintains symmetrical thermal paths and each device is derated per its individual IO and thermal limits.
Is the S3A suitable for automotive applications?
The S3A is not AEC-Q101 qualified and lacks automotive-specific qualification testing (e.g., HTOL, temperature cycling). While its –65°C to +150°C rating overlaps automotive under-hood ranges, Diodes Incorporated does not endorse or guarantee its use in automotive safety-critical systems without additional customer validation.
How does the S3A's glass passivation improve reliability compared to epoxy-passivated diodes?
Glass passivation provides superior moisture barrier properties and higher thermal stability than organic epoxies, reducing parameter drift and preventing corrosion-induced failure under humid or thermally cycled environments - validated by JESD22-A101 humidity testing and 1000-hour high-temperature storage life data.
S3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NKK Switches
- Series:
- S
- Packaging:
- Bulk
- Product Status:
- Active
- Mounting Type:
- Panel Mount
- Circuit:
- SPDT
- Switch Function:
- On-Off-On
- Current Rating (Amps):
- 15A (AC), 20A (DC)
- Voltage Rating - AC:
- 125 V
- Voltage Rating - DC:
- 30 V
- Actuator Type:
- Standard Round
- Actuator Length:
- 17.50mm
- Illumination:
- Non-Illuminated
- Illumination Type, Color:
- -
- Illumination Voltage (Nominal):
- -
- Termination Style:
- Solder Lug
- Panel Cutout Dimensions:
- Circular - 12.50mm Dia
- Bushing Thread:
- M12 x 1
- Ingress Protection:
- -
- Features:
- -
- Operating Temperature:
- -10°C ~ 70°C
S3A FAQ
1.How can I place an order for S3A through Aetrix?
Please submit a Request for Quotation (RFQ) for S3A 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 S3A reliable?
The price and inventory of S3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3A is usually 5 days.
3.What payment methods are accepted for S3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S3A?
S3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S3A 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 S3A?
For technical support, including S3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3A requirements.
6.How does Aetrix verify that S3A is sourced from the original manufacturer or authorized distributors?
All S3A 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 S3A meets industry standards.
7.What is the process for return or replacement of S3A?
All S3A units undergo pre-shipment inspection (PSI). If there is an issue with S3A, 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 S3A part is unused and in its original packaging.
Return procedure for S3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
S3A Tags
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