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Taiwan Semiconductor Corporation S4K
- Part No.:
- S4K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
S4K.pdf
- Description:
- DIODE GEN PURP 800V 4A DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
S4K from Taiwan Semiconductor is a 4A, 800V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring 1.15V max forward voltage at 4A/25°C, 100A peak surge current capability, and 150°C maximum junction temperature - used in high-efficiency AC/DC front-end rectification for industrial SMPS.
For engineers reviewing the S4K datasheet, S4K pinout, S4K application, or S4K equivalent, key selection criteria include repetitive peak reverse voltage (800V), thermal resistance (13°C/W junction-to-lead), reverse recovery time (1500ns), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance for automated SMT assembly.
Technical Context
The S4K is a single-die, glass-passivated standard recovery rectifier optimized for cost-sensitive, medium-voltage power conversion where fast recovery is not required. Its 1500ns reverse recovery time and 60pF junction capacitance reflect trade-offs favoring low conduction loss over switching speed.
Designed for operation up to 150°C junction temperature with 13°C/W junction-to-lead thermal resistance, the S4K supports high-current continuous conduction in compact SMC packages without forced airflow - validated by derating curves showing 4A average current maintained up to ~90°C ambient with adequate PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports DC bus voltages up to 565V RMS input in bridge configurations |
| IF(AV) | 4 A - continuous forward current rating at case temperature ≤75°C with sufficient heatsinking |
| IFSM | 100 A - withstands 8.3ms half-sine surge, enabling robust inrush handling in offline converters |
| VF | ≤1.15 V @ 4A, 25°C - minimizes conduction loss and self-heating in high-duty-cycle applications |
| trr | 1500 ns - suitable for line-frequency and low-frequency (<100 kHz) switching topologies |
| RθJL | 13 °C/W - enables direct thermal path to PCB copper, critical for thermal management in dense layouts |
| MSL | Level 1 (J-STD-020) - allows unlimited floor life and standard reflow without baking |
Pinout & Package
Package: DO-214AB (SMC), molded epoxy case meeting UL 94V-0; matte tin-plated leads; cathode indicated by band; weight ≈0.210g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to AC input or transformer secondary side; requires adequate trace width for 4A continuous |
| Cathode | Current exit terminal during forward conduction | Marked with band; ties to DC bus or smoothing capacitor positive; primary heat path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling vs. non-passivated alternatives |
| Low VF (≤1.15V @ 4A) | Reduces power dissipation by ~0.5W compared to 1.3V diodes at same load, lowering thermal stress |
| J-STD-020 Level 1 MSL | Eliminates pre-bake requirements and simplifies SMT line integration for high-volume manufacturing |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for end equipment |
Applications
| Industrial SMPS Front-End Rectification | LED Driver Input Stage |
|---|---|
Use Scenario: AC line rectification in 100–500W open-frame industrial power supplies operating at 50/60Hz. IC Role / Device Role / Timing Role: Primary unidirectional current switch converting AC input to pulsating DC before bulk capacitor filtering. Use Value: 800V VRRM ensures margin against line surges; 100A IFSM handles cold-start inrush without degradation. | Use Scenario: Bridge rectification in constant-current LED drivers for street lighting and high-bay fixtures. IC Role / Device Role / Timing Role: High-reliability, thermally stable rectifier delivering steady DC to downstream buck controller and LED string. Use Value: 150°C TJ max and 13°C/W RθJL allow operation in enclosed, thermally constrained luminaires without active cooling. |
| AC-DC Adapter Secondary Side | DC-DC Converter Input Protection |
Use Scenario: Output rectification in universal-input (90–264VAC) wall adapters powering consumer electronics. IC Role / Device Role / Timing Role: Low-loss freewheeling path during transformer reset; conducts full-load current continuously. Use Value: 1.15V VF reduces conduction loss by >15% vs. legacy 1N54xx series, improving efficiency and reducing heatsink size. | Use Scenario: Reverse-polarity and back-EMF protection at input of isolated DC-DC modules in battery-powered systems. IC Role / Device Role / Timing Role: Unidirectional blocking element preventing damage from accidental reverse connection or inductive kickback. Use Value: 800V rating provides safety margin against transients on 48V or 60V nominal buses; DO-214AB footprint fits tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH4R08D | 800V, 4A, TO-220AC package; faster trr (75ns); higher VF (1.7V @ 4A) | Requires heatsink; suited for higher-frequency PFC stages where recovery speed matters | Choose STTH4R08D only if board-level thermal design accommodates TO-220 mounting and trr <100ns is mandatory |
| ES4D-E3/57T | 200V, 4A, DO-214AB; lower VRRM; VF = 1.15V; trr = 35ns | Limited to low-voltage DC inputs; unsuitable for AC line rectification | Select ES4D-E3/57T only for secondary-side or low-VIN DC-DC applications where 800V rating is unnecessary |
Compared with STTH4R08D and ES4D-E3/57T, the S4K uniquely balances 800V ruggedness, SMC surface-mount compatibility, and low VF in a cost-optimized standard recovery rectifier - making it optimal for line-frequency industrial and lighting power supplies where thermal and surge robustness outweigh ultra-fast switching needs.
Availability
S4K is available at Aetrix Electronics and suitable for industrial SMPS, LED driver designs, AC-DC adapters, and DC-DC converter input protection requiring stable component supply across multi-year production cycles.
Supply support for S4K 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 industrial, computing, and consumer markets since 1979.
The S4K belongs to TSC's S4x family of surface-mount rectifiers - engineered for high-current, medium-voltage AC/DC conversion in cost-sensitive, high-reliability power systems where thermal stability and surge tolerance are prioritized over ultra-fast switching.
FAQ
What is the maximum junction temperature rating for the S4K?
The S4K has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet. This allows reliable operation in thermally demanding environments such as enclosed LED drivers or industrial power supplies when mounted on adequately sized PCB copper areas. The S4K must not exceed this limit during steady-state or transient conditions to ensure long-term reliability.
Does the S4K have a specified reverse recovery time, and how does it affect circuit performance?
Yes, the S4K has a reverse recovery time (trr) of 1500 ns, measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A. This value confirms its classification as a standard recovery rectifier - appropriate for line-frequency and low-switching-frequency applications (e.g., <100 kHz), but not recommended for high-frequency PFC or resonant topologies where faster recovery is required. Using the S4K in such contexts may increase switching losses and EMI.
Is the S4K RoHS compliant and halogen-free?
Yes, the S4K is RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as explicitly stated in the Taiwan Semiconductor product documentation. These compliance attributes are confirmed for the DO-214AB (SMC) packaged S4K and support regulatory requirements for CE-marked industrial and lighting equipment. No exemptions or exceptions apply to the S4K material composition.
What is the marking code printed on the S4K device body?
The S4K device is marked with "S4K" on its body, consistent with the ordering code and polarity indication via a cathode band. This marking aligns with the manufacturer's standardized labeling for the S4x series and enables visual identification and traceability on assembled PCBs. No additional date codes, factory identifiers, or green compound indicators are required for basic part verification.
Can the S4K replace the S4M in a design requiring 1000V VRRM?
No, the S4K cannot replace the S4M in designs requiring 1000V VRRM because the S4K is rated for 800V repetitive peak reverse voltage - a 200V shortfall that risks catastrophic failure under rated surge or line transient conditions. While both share the same DO-214AB package and thermal characteristics, the voltage rating is fixed per variant; substituting S4K for S4M violates absolute maximum ratings and voids design safety margins.
S4K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1.5 µs
- Current - Reverse Leakage @ Vr:
- 100 µA @ 800 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 150°C
S4K FAQ
1.How can I place an order for S4K through Aetrix?
Please submit a Request for Quotation (RFQ) for S4K 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 S4K reliable?
The price and inventory of S4K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4K is usually 5 days.
3.What payment methods are accepted for S4K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S4K?
S4K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S4K 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 S4K?
For technical support, including S4K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4K requirements.
6.How does Aetrix verify that S4K is sourced from the original manufacturer or authorized distributors?
All S4K 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 S4K meets industry standards.
7.What is the process for return or replacement of S4K?
All S4K units undergo pre-shipment inspection (PSI). If there is an issue with S4K, 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 S4K part is unused and in its original packaging.
Return procedure for S4K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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