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Taiwan Semiconductor Corporation S3AB
- Part No.:
- S3AB
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
S3AB.pdf
- Description:
- DIODE GEN PURP 50V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,017
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Product details
Overview
S3AB from Taiwan Semiconductor is a 3A, 50V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low forward voltage drop (max 1.15V at 3A), high surge capability (80A IFSM), and 150°C max junction temperature. It serves as a primary output rectifier in compact AC/DC adapters and offline SMPS.
For engineers reviewing the S3AB datasheet, S3AB pinout, S3AB application, or S3AB equivalent, key selection criteria include repetitive peak reverse voltage (50V), forward current rating (3A), thermal resistance (10°C/W), reverse recovery time (1500ns), and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
The S3AB is a single-die, unidirectional standard recovery rectifier optimized for cost-sensitive, medium-frequency switching applications up to ~100 kHz. Its 1500 ns reverse recovery time and 40 pF junction capacitance reflect trade-offs between switching loss and conduction efficiency in flyback and forward converter topologies.
Thermally, the device relies on lead-frame conduction via its DO-214AA (SMB) package with 10°C/W junction-to-lead resistance; derating begins above 75°C ambient per the forward current curve, and moisture sensitivity is rated J-STD-020 Level 1 - suitable for standard reflow without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines minimum input/output isolation margin in 24–48V DC-DC stages. |
| IF | 3 A - Continuous average forward current; supports up to ~36W output in 12V SMPS with appropriate heatsinking. |
| IFSM | 80 A - Non-repetitive surge rating; withstands inrush and transient overloads during cold-start or line dips. |
| VF (max) | 1.15 V @ 3A, 25°C - Directly impacts conduction loss; contributes ~3.45W dissipation at full load before thermal derating. |
| trr | 1500 ns - Limits usable switching frequency; suitable for ≤100 kHz operation to avoid excessive switching loss. |
| RθJL | 10 °C/W - Enables thermal design using PCB copper area as heatsink; 30°C rise at 3A implies ~75°C junction temp at 45°C ambient. |
| CJ | 40 pF @ 4V - Affects EMI generation and snubber sizing in high-dV/dt environments like flyback transformers. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction | Connected to transformer secondary or switch node; must handle full surge current and thermal stress. |
| Cathode | Output terminal for forward conduction | Connected to output capacitor and load; polarity marked by visible band; determines grounding topology (e.g., common-cathode sync). |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in non-hermetic enclosures. |
| Low VF (1.15V max) | Reduces conduction loss by ~15% vs. legacy 1.35V rectifiers at 3A, improving efficiency in 5–24V adapter outputs. |
| J-STD-020 Level 1 MSL | Allows direct placement into standard reflow ovens without baking or dry-pack handling-reducing manufacturing overhead. |
| RoHS + halogen-free | Meets IEC 61249-2-21 and EU Directive 2011/65/EU; enables export to EU, Japan, and South Korea without material declaration exceptions. |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for Class II insulated power supplies and LED drivers. |
Applications
| AC/DC Adapters | Offline Flyback SMPS |
|---|---|
Use Scenario: Wall-mounted 5–24V, 10–36W power adapters for consumer electronics and IoT gateways. IC Role / Device Role / Timing Role: Output rectifier converting transformer secondary AC to regulated DC; operates at 65–100 kHz switching frequency. Use Value: Low VF minimizes heat buildup in sealed plastic housings; SMB package fits tight board layouts while supporting 3A continuous load. | Use Scenario: Primary-side regulated flyback converters in industrial control power modules with universal AC input. IC Role / Device Role / Timing Role: Secondary-side rectifier clamping output voltage and delivering energy to bulk capacitor; handles 80A surge during startup. Use Value: 150°C TJ rating and 10°C/W RθJL allow stable operation at 70°C ambient without forced air cooling. |
| LED Drivers | DC-DC Buck Converters |
Use Scenario: Constant-voltage LED drivers for commercial lighting fixtures operating from 12–48V DC bus. IC Role / Device Role / Timing Role: Freewheeling diode providing current path during MOSFET off-time in buck-derived topologies. Use Value: 50V VRRM provides sufficient margin over 48V bus transients; 40pF CJ limits high-frequency ringing in PWM dimming circuits. | Use Scenario: Input rectification stage in isolated DC-DC modules converting 24–48V DC to 3.3/5/12V for embedded controllers. IC Role / Device Role / Timing Role: Bridge or half-wave rectifier feeding input filter capacitor; subjected to repeated 80A surges during hot-plug events. Use Value: Glass passivation ensures stable IR performance across 10-year field life in automotive-grade temperature cycling (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semi MUR350 | Ultrafast recovery (75ns), higher VF (1.3V), same 3A/50V rating and SMB package. | Better suited for >200kHz PFC or resonant converters where trr dominates loss. | Select MUR350 only when reducing switching loss outweighs conduction loss increase and thermal budget allows higher VF. |
| Vishay VS-3EYH05-M3 | Standard recovery (1.5µs), identical VF (1.15V), same 3A/50V/SMB but AEC-Q101 qualified. | Required for automotive infotainment or body electronics where qualification is mandatory. | Choose VS-3EYH05-M3 if automotive qualification is needed; otherwise S3AB offers equivalent electrical performance at lower cost. |
Compared with MUR350 and VS-3EYH05-M3, the S3AB delivers optimal balance of low conduction loss, robust surge handling, and cost efficiency for industrial and consumer SMPS-without ultrafast timing or automotive qualification overhead.
Availability
S3AB is available at Aetrix Electronics and suitable for AC/DC adapters, offline flyback SMPS, and LED drivers requiring stable component supply, consistent parametric performance, and J-STD-020 Level 1 manufacturability.
Supply support for S3AB 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power, industrial, and consumer markets since 1979.
The S3AB belongs to TSC's S3x series of standard surface-mount rectifiers, designed specifically for cost-effective, thermally robust AC/DC and DC/DC power conversion in space-constrained applications.
FAQ
What is the maximum junction temperature rating for the S3AB?
The S3AB has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows reliable operation in enclosed power supplies where ambient temperatures reach 70–85°C, provided thermal design accounts for its 10°C/W junction-to-lead resistance. The S3AB maintains specified VF and IR performance up to this limit, making it suitable for industrial-grade S3AB deployments.
Is the S3AB RoHS and halogen-free compliant?
Yes, the S3AB is fully RoHS compliant and halogen-free per IEC 61249-2-21. This is confirmed in the official Taiwan Semiconductor datasheet revision M2102. These compliance attributes apply directly to the S3AB and are verified through material declarations and third-party testing, enabling use in EU, Japan, and other regulated markets without exemption requests.
What does the "AB" suffix indicate in S3AB?
The "AB" suffix in S3AB denotes the 50V repetitive peak reverse voltage (VRRM) rating within the S3x family. Per Taiwan Semiconductor's ordering code documentation, "x" maps to voltage grade: AB = 50V, BB = 100V, DB = 200V, etc. This coding is laser-marked on the device body and defines the core blocking capability of the S3AB.
Can the S3AB replace a 1N5408 in a PCB layout?
No, the S3AB cannot directly replace a 1N5408 due to package and pinout incompatibility: S3AB uses DO-214AA (SMB), while 1N5408 uses DO-201AD (AXIAL). Though both are 3A/50V rectifiers, the S3AB requires re-layout for surface-mount pads and lacks axial leads. The S3AB offers superior thermal resistance (10°C/W vs. ~50°C/W) and automated placement compatibility-but is not a drop-in mechanical substitute for the 1N5408.
What is the reverse recovery time (trr) specification for the S3AB?
The S3AB has a typical reverse recovery time (trr) of 1500 ns, measured at IF = 0.5A, IR = 1.0A, and Irr = 0.25A. This value is specified in the Electrical Specifications table of the M2102 datasheet and reflects its standard recovery behavior. Designers should account for this trr when selecting snubbers or estimating switching losses in flyback or forward converters operating above 50 kHz. The S3AB is not intended for high-frequency synchronous rectification.
S3AB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.15 V @ 3 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1.5 µs
- Current - Reverse Leakage @ Vr:
- 10 µA @ 50 V
- Capacitance @ Vr, F:
- 40pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
S3AB FAQ
1.How can I place an order for S3AB through Aetrix?
Please submit a Request for Quotation (RFQ) for S3AB 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 S3AB reliable?
The price and inventory of S3AB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3AB is usually 5 days.
3.What payment methods are accepted for S3AB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3AB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S3AB?
S3AB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S3AB 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 S3AB?
For technical support, including S3AB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3AB requirements.
6.How does Aetrix verify that S3AB is sourced from the original manufacturer or authorized distributors?
All S3AB 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 S3AB meets industry standards.
7.What is the process for return or replacement of S3AB?
All S3AB units undergo pre-shipment inspection (PSI). If there is an issue with S3AB, 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 S3AB part is unused and in its original packaging.
Return procedure for S3AB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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